Zhejiang Nhu Special Materials Co., Ltd

China

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IPC Class
C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds 6
C08G 69/28 - Preparatory processes 5
C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids 4
C08G 75/0259 - Preparatory processes using metal hydrogensulfides 4
C08L 81/02 - PolythioethersPolythioether-ethers 4
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Found results for  patents

1.

Use of a Multidentate Phosphite Ligand in the Catalytic Synthesis of Adiponitrile

      
Application Number 17800452
Status Pending
Filing Date 2022-06-21
First Publication Date 2024-10-10
Owner
  • ZHEJIANG NHU CO., LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU NYLON MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Yin, Hong
  • Zha, Zengshi
  • Wang, Keyan
  • Ma, Li
  • Huang, Guodong
  • Zhou, Guiyang
  • Xu, Yong

Abstract

A multidentate phosphite ligand is used in the catalytic synthesis of adiponitrile. The ligand is represented by the following general formula (I). The method of catalytic synthesis of adiponitrile comprises primary hydrocyanation, isomerization, and secondary hydrocyanation reactions, wherein the catalyst adopted each comprises a phosphite ligand-nickel complex composed of a nickel precursor and a multidentate phosphite ligand. The ligand molecule has a higher electron cloud density, and the phosphorus content capable of participating in coordination in the ligand molecule per unit mass is higher, so that the catalytic activity of the catalyst is improved, and the amount of the catalyst is reduced. A multidentate phosphite ligand is used in the catalytic synthesis of adiponitrile. The ligand is represented by the following general formula (I). The method of catalytic synthesis of adiponitrile comprises primary hydrocyanation, isomerization, and secondary hydrocyanation reactions, wherein the catalyst adopted each comprises a phosphite ligand-nickel complex composed of a nickel precursor and a multidentate phosphite ligand. The ligand molecule has a higher electron cloud density, and the phosphorus content capable of participating in coordination in the ligand molecule per unit mass is higher, so that the catalytic activity of the catalyst is improved, and the amount of the catalyst is reduced.

IPC Classes  ?

  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds
  • B01J 31/18 - Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony
  • B01J 37/04 - Mixing
  • C07F 9/06 - Phosphorus compounds without P—C bonds
  • C07F 9/6571 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms

2.

CATALYST SYSTEM AND METHOD FOR CARBONYLATION REACTION

      
Application Number CN2023119152
Publication Number 2024/139427
Status In Force
Filing Date 2023-09-15
Publication Date 2024-07-04
Owner
  • ZHEJIANG NHU CO., LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • SHANDONG NHU FINE CHEMICAL SCIENCE AND TECHNOLOGY COMPANY LTD. (China)
Inventor
  • Wang, Chuang
  • Pan, Jiasheng
  • Li, Haoran
  • Hong, Xin
  • Zhang, Yuhong
  • Wu, Lei
  • Xu, Yong
  • Zhang, Shuoqing

Abstract

The present invention relates to a catalyst system for a carbonylation reaction and a method for a carbonylation reaction. The catalyst system comprises: (a) a group VIII metal or a compound of the group VIII metal; (b) a bidentate phosphine ligand; and (c) an acidic additive. The component (b) is represented by the following formula (I): R1>P-A-Ar-B-P

IPC Classes  ?

  • B01J 31/24 - Phosphines
  • C07F 9/6568 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus atoms as the only ring hetero atoms
  • C07F 9/6571 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
  • C07F 9/6584 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and nitrogen atoms with or without oxygen or sulfur atoms, as ring hetero atoms having one phosphorus atom as ring hetero atom
  • C07F 9/50 - Organo-phosphines
  • C07C 67/38 - Preparation of carboxylic acid esters by reaction with carbon monoxide or formates by addition to an unsaturated carbon-to-carbon bond
  • C07C 69/24 - Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen having three or more carbon atoms in the acid moiety esterified with monohydroxylic compounds
  • C07C 69/612 - Esters of carboxylic acids having a carboxyl group bound to an acyclic carbon atom and having a six-membered aromatic ring in the acid moiety
  • C07C 69/75 - Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring of acids with a six-membered ring

3.

METHOD FOR MANUFACTURING HIGH-REACTIVITY POLYPHENYLENE SULFIDE RESIN AND PRODUCT MANUFACTURED THEREBY

      
Application Number CN2023123839
Publication Number 2024/078508
Status In Force
Filing Date 2023-10-10
Publication Date 2024-04-18
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU CO., LTD (China)
Inventor
  • Yang, Zheng
  • Gui, Huiqiang
  • Deng, Hangjun
  • Zhou, Guiyang
  • Hu, Jun

Abstract

Disclosed in the present invention are a method for manufacturing high-activity polyphenylene sulfide (PPS) by regulating and controlling the water content in the polymerization process and a high-efficiency PPS resin manufactured thereby. The manufacturing method comprises: taking sodium hydrosulfide and p-dichlorobenzene as raw materials, taking N-methyl-2-pyrrolidone as a solvent, carrying out a polycondensation reaction until the conversion rate of p-dichlorobenzene reaches 97% or more, adding deionized water, reducing the temperature in a reaction kettle to 250-260°C, keeping the temperature for 1-3 h, and cooling for post-processing. The molar weight of the added deionized water is 1.0-2.5 mol based on 1.0 mol of sodium hydrosulfide. The method for manufacturing high-activity PPS disclosed in the present invention can be realized in the PPS polymerization process, that is, an end-capping reagent does not need to be additionally added, without affecting the molecular weight and thermal stability of the finally manufactured PPS; chain extension treatment does not need to be carried out after the PPS resin is manufactured, without additionally increasing the technological process and the production cost.

IPC Classes  ?

  • C08G 75/0259 - Preparatory processes using metal hydrogensulfides
  • C08G 75/029 - Modification with organic compounds

4.

POLY(ARYLENE SULFIDE) RESIN MANUFACTURING PROCESS, PRODUCT THEREOF, AND APPLICATION THEREOF

      
Application Number CN2023096116
Publication Number 2024/021816
Status In Force
Filing Date 2023-05-24
Publication Date 2024-02-01
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU CO., LTD (China)
Inventor
  • Chen, Zhirong
  • Yin, Hong
  • Jia, Yanyu
  • Zhang, Xiongwei
  • Lian, Ming
  • Chen, Xing
  • Jiang, Jie
  • Li, Woyuan

Abstract

Disclosed are a poly(arylene sulfide) manufacturing process, a product thereof, and an application thereof. The manufacturing process uses a sulfur source and a dichloroaromatic compound as raw materials, utilizes an organic amide solvent, and performs a series of processes for preparation, including dehydration, pre-polymerization, polymerization, flash evaporation, post-treatment, etc. The invention creatively adds sodium chloride seed crystals into a reaction liquid during the pre-polymerization stage, and adds a filtration processing step for the reaction liquid after the pre-polymerization reaction ends. The use of the manufacturing process allows for greatly reducing the salt content of a prepared poly(arylene sulfide) resin crude product, greatly reducing the amount of high-salt wastewater generated, reducing water consumption and energy consumption, and helping to efficiently prepare a high-molecular-weight poly(arylene sulfide) resin; more importantly, the process is not only suitable as an intermittent process, but is likewise suited for continuous production, and is expected to greatly increase the production efficiency of the production system, reduce production costs and be more environmentally-friendly and green.

IPC Classes  ?

  • C08G 75/0259 - Preparatory processes using metal hydrogensulfides

5.

PREPARATION METHOD AND APPARATUS FOR METHYL METHACRYLATE

      
Application Number 18240466
Status Pending
Filing Date 2023-08-31
First Publication Date 2023-12-21
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Wu, Lei
  • Cheng, Kunpeng
  • Li, Xueming
  • Hong, Runrun
  • Shi, Qing'Ai
  • Wang, Chuang
  • Huang, Guodong
  • Zhou, Guiyang

Abstract

A method and apparatus for preparing methyl methacrylate (MMA) are provided. The method includes an aldol condensation reaction, a first distillation, a second distillation, a third distillation, a phase splitting, and a fourth distillation. Through the control of the process, the aldol condensation reaction can be performed when methyl propionate is used as the ninth material stream and formalin solution is used as the fifteenth stream material, MMA is obtained as the final product from the third material stream, and the waste with low content of residual formaldehyde is recovered from the eighth material stream.

IPC Classes  ?

  • C07C 67/035 - Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with saturated hydrocarbons
  • B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus
  • B01J 21/06 - Silicon, titanium, zirconium or hafniumOxides or hydroxides thereof
  • B01J 23/04 - Alkali metals

6.

METHOD FOR PREPARING PHOSPHORUS-CONTAINING LIGAND

      
Application Number CN2022102172
Publication Number 2023/206791
Status In Force
Filing Date 2022-06-29
Publication Date 2023-11-02
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU NYLON MATERIALS CO., LTD. (China)
Inventor
  • Zha, Zengshi
  • Chen, Zhirong
  • Wu, Wenbin
  • Zhang, Tinglan
  • Yin, Hong
  • Wang, Keyan
  • Zhou, Litao
  • Li, Haoran
  • Huang, Guodong
  • Xu, Yong

Abstract

11011011010 alkanoyl, aryl, heteroaryl, cyano, or nitro, and n is an integer from 1 to 8; and mixing the first preparation with the second preparation for a reaction, removing HCl generated by the reaction, filtering, and carrying out post-processing on a filtrate to obtain the phosphorus-containing ligand.

IPC Classes  ?

  • C07F 9/141 - Esters of phosphorous acids
  • C07F 9/145 - Esters of phosphorous acids with hydroxyaryl compounds
  • C07F 9/572 - Five-membered rings
  • C07F 9/6506 - Five-membered rings having the nitrogen atoms in positions 1 and 3
  • C07F 9/6584 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and nitrogen atoms with or without oxygen or sulfur atoms, as ring hetero atoms having one phosphorus atom as ring hetero atom
  • B01J 31/02 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
  • B01J 31/06 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
  • B01J 35/08 - Spheres

7.

PREPARATION METHOD AND APPARATUS FOR METHYL METHACRYLATE

      
Application Number CN2022115487
Publication Number 2023/071490
Status In Force
Filing Date 2022-08-29
Publication Date 2023-05-04
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Wu, Lei
  • Cheng, Kunpeng
  • Li, Xueming
  • Hong, Runrun
  • Shi, Qing'Ai
  • Wang, Chuang
  • Huang, Guodong
  • Zhou, Guiyang

Abstract

The present application relates to a preparation method and apparatus for methyl methacrylate. The preparation method comprises an aldol condensation reaction, first distillation, second distillation, third distillation, phase splitting, and fourth distillation, so that by means of the control of a process flow, it is only needed to use methyl propionate as a ninth material stream and use a formalin solution as a fifteenth material stream so as to perform the aldol condensation reaction, and a final product, i.e., methyl methacrylate, is obtained from a third material stream, and waste materials comprising low formaldehyde residues is recovered from an eighth material stream.

IPC Classes  ?

  • C07C 67/343 - Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisationPreparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by change of size of the carbon skeleton by increase in the number of carbon atoms
  • C07C 69/54 - Acrylic acid estersMethacrylic acid esters

8.

APPLICATION OF POLYDENTATE PHOSPHITE LIGAND IN CATALYTIC SYNTHESIS OF ADIPONITRILE

      
Application Number CN2022100184
Publication Number 2023/060929
Status In Force
Filing Date 2022-06-21
Publication Date 2023-04-20
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU CO., LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU NYLON MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Yin, Hong
  • Zha, Zengshi
  • Wang, Keyan
  • Ma, Li
  • Huang, Guodong
  • Zhou, Guiyang
  • Xu, Yong

Abstract

The present invention relates to an application of a polydentate phosphite ligand in the catalytic synthesis of adiponitrile. The ligand is represented by general formula (I). A method for catalytically synthesizing adiponitrile comprises a primary hydrocyanation reaction, an isomerization reaction and a secondary hydrocyanation reaction, wherein the catalysts used respectively comprise a phosphite ligand-nickel complex comprised of a nickel precursor and a polydentate phosphite ligand. The ligand molecule has a higher electron cloud density, and the content of phosphorus capable of participating in coordination in unit mass of the ligand molecule is higher, so that the catalytic activity of the catalyst is improved, and the amount of the catalyst is reduced. Furthermore, by designing and optimizing the ligand skeleton structure, the three-dimensional steric configuration of the phosphite ligand-nickel complex can be adjusted, and by combining with flexible regulation and control of the electronic effect and the steric hindrance effect of a substituent group on the ligand molecular structure, the chemical environment and the three-dimensional steric effect around a metal center can be changed, and the selectivity for the linear product adiponitrile is improved.

IPC Classes  ?

  • C07C 255/04 - Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton containing two cyano groups bound to the carbon skeleton
  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds
  • B01J 31/24 - Phosphines
  • C07F 9/6571 - Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms

9.

Porous Polymer and Method for Preparing the Same, Catalyst, and Method for Preparing Adiponitrile

      
Application Number 17795838
Status Pending
Filing Date 2021-09-16
First Publication Date 2023-03-30
Owner
  • ZHEJIANG NHU CO., LTD. (China)
  • SHANDONG NHU AMINO ACID CO., LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Yin, Hong
  • Liu, Yaqing
  • Zha, Zengshi
  • Feng, Zhichao
  • Zhang, Tinglan
  • Huang, Guodong

Abstract

A porous polymer has a pore volume of 0.3 to 2.5 cm3/g and comprises a pore having a first pore diameter and a pore having a second pore diameter. A ratio of pore volume of the pore having a first pore diameter to pore volume of the pore having a second pore diameter is 1 to 10:1. The porous polymer is obtained by self-polymerization or copolymerization of at least one of the phosphorus ligands, and phosphorous content of the porous polymer is 1 to 5 mmol/g. The porous polymer-nickel catalyst made of the porous polymer has a significant increase in water resistance, which may reduce the consumption of phosphorus ligands, eliminating the steps of removing water from raw materials and reaction system water control, which greatly saves process equipment investment. When used in the preparation of adiponitrile from butadiene, it has high catalytic activity, high reaction selectivity, and high linearity.

IPC Classes  ?

  • B01J 31/06 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
  • C08F 30/02 - Homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
  • C08J 9/14 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
  • B01J 23/755 - Nickel
  • B01J 31/28 - Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups of the platinum group metals, iron group metals or copper
  • B01J 35/10 - Solids characterised by their surface properties or porosity
  • B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds

10.

METHOD AND DEVICE FOR PREPARING ADIPONITRILE

      
Application Number 17778276
Status Pending
Filing Date 2020-12-11
First Publication Date 2023-02-02
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU COMPANY LTD (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Zhou, Guiyang
  • Feng, Ming
  • Shi, Xingxing
  • Ma, Tao
  • Feng, Zhichao
  • Zhang, Xiongwei
  • Sun, Qing
  • Xu, Yong

Abstract

Provided are a method and device for preparing adiponitrile. The method of the present disclosure comprises the steps of a first hydrocyanation reaction, an isomerization reaction and a second hydrocyanation reaction, wherein online Raman spectroscopy is used for detecting the content of a specific component in the system; and the reaction conditions are regulated based on the detection results, so as to achieve precise control of the materials in each step of the reaction system. The method of the present disclosure can reduce an amount of butadiene, thereby reducing the subsequent energy consumption needed for recycling butadiene and equipment investment after reaction; by monitoring the content of hydrocyanic acid in real time, the residue of hydrocyanic acid is reduced to a lower level, and the operation safety and the stability of a catalyst during reaction are improved; and the loss of the catalyst is reduced.

IPC Classes  ?

  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds

11.

POROUS POLYMER, PREPARATION METHOD THEREFOR, CATALYST AND PREPARATION METHOD FOR ADIPONITRILE

      
Application Number CN2021118766
Publication Number 2022/142484
Status In Force
Filing Date 2021-09-16
Publication Date 2022-07-07
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU CO., LTD. (China)
  • SHANDONG NHU AMINO ACID CO., LTD. (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Yin, Hong
  • Liu, Yaqing
  • Cha, Zengshi
  • Feng, Zhichao
  • Zhang, Tinglan
  • Huang, Guodong

Abstract

A porous polymer having a pore volume of 0.3-2.5 cm3/g, the porous polymer comprising pores having a first pore diameter and pores having a second pore diameter, wherein the pore volume ratio of the pores having the first pore diameter to the pores having the second pore diameter is 1-10:1. The porous polymer is obtained by means of self-polymerization or copolymerization of at least one phosphorus ligand, and the phosphorus content of the porous polymer is 1-5 mmol/g. A porous polymer-nickel catalyst prepared from the porous polymer has significantly improved water resistance, can reduce the consumption of phosphorus ligands, omits the steps of water removal of raw materials and water control of a reaction system, and greatly saves on process equipment investment. In addition, when used for preparing adiponitrile by using butadiene, the catalyst has a high catalytic activity, a high reaction selectivity and high linearity, and is easy to recycle and reuse.

IPC Classes  ?

  • C08F 230/02 - Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
  • C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof
  • B01J 31/22 - Organic complexes
  • B01J 31/18 - Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony
  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds
  • C07C 255/07 - Mononitriles
  • C07C 255/04 - Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton containing two cyano groups bound to the carbon skeleton
  • B01J 35/10 - Solids characterised by their surface properties or porosity
  • C08L 43/02 - Homopolymers or copolymers of monomers containing phosphorus

12.

HIGH-THERMAL-CONDUCTIVITY REINFORCED POLYPHENYLENE SULFIDE COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR

      
Application Number CN2021127323
Publication Number 2022/121547
Status In Force
Filing Date 2021-10-29
Publication Date 2022-06-16
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Zhou, Guiyang
  • Yin, Hong
  • Chen, Zhirong
  • Han, Yuqing
  • Shen, Jintao
  • Deng, Hangjun
  • Zhou, Yougui

Abstract

Disclosed are a high-thermal-conductivity reinforced polyphenylene sulfide composite material and a preparation method therefor, the high-thermal-conductivity reinforced polyphenylene sulfidecomposite material comprising the following raw materials by weight percentage: 30-50% of a polyphenylene sulfide base material; 5-30% of a surface carbonized reinforcing body; and 20-60% of a heat-conducting filler, the surface carbonized reinforcing body being a reinforcing body the outer surface of which is coated with a carbon layer. The preparation method comprises: blending a monomer raw material, a reinforcing body and an optionally added two-dimensional sheet-like heat-conducting filler, and passing through in-situ polymerization and carbonization to obtain a surface carbonized reinforcing body; and by using a polyphenylene sulfide base material, the heat-conducting filler and the prepared surface carbonized reinforcement as raw materials, passing through extrusion granulation to prepare and obtain a high-thermal-conductivity reinforced polyphenylene sulfide composite material. In the high-thermal-conductivity reinforced polyphenylene sulfide composite material disclosed, excellent processability and mechanical properties of the polyphenylene sulfide composite material are ensured while significantly improving the thermal conductivity of the polyphenylene sulfide composite material.

IPC Classes  ?

  • C08L 81/02 - PolythioethersPolythioether-ethers
  • C08K 9/02 - Ingredients treated with inorganic substances
  • C08J 5/06 - Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
  • C08J 5/08 - Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
  • C08J 5/10 - Reinforcing macromolecular compounds with loose or coherent fibrous material characterised by the additives used in the polymer mixture
  • C08K 7/06 - Elements
  • C08K 3/04 - Carbon
  • C08K 3/34 - Silicon-containing compounds
  • C08K 3/38 - Boron-containing compounds
  • C09K 5/14 - Solid materials, e.g. powdery or granular

13.

Semi-aromatic polyamide resin and preparation method therefor

      
Application Number 17416587
Grant Number 12168717
Status In Force
Filing Date 2019-11-20
First Publication Date 2022-01-27
Grant Date 2024-12-17
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Yin, Hong
  • Deng, Hangjun
  • Zhou, Guiyang
  • Zhu, Danqi
  • Wu, Xiaoxiao
  • Hong, Wengang
  • Qiu, Guisheng
  • Li, Qichuan

Abstract

The present disclosure discloses a semi-aromatic polyamide and a preparation method therefor. The semi-aromatic polyamide is obtained by polymerization reaction using a diamine, a dibasic acid and a monoacid as main raw materials while adding a special end-capping agent. The semi-aromatic polyamide prepared according to the present disclosure has good thermal stability, a yellowness index of less than 20, a glass transition temperature of 90° C. or above, and a melting point of 300° C. or above, and can be applied to spare parts for fuel pipelines in automobiles, and electronic and electrical industries such as LED panels.

IPC Classes  ?

  • C08G 69/48 - Polymers modified by chemical after-treatment
  • C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
  • C08G 69/28 - Preparatory processes
  • C08L 77/06 - Polyamides derived from polyamines and polycarboxylic acids

14.

METHOD AND DEVICE FOR PREPARING ADIPONITRILE

      
Application Number CN2020135799
Publication Number 2021/143412
Status In Force
Filing Date 2020-12-11
Publication Date 2021-07-22
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Wu, Wenbin
  • Zhou, Guiyang
  • Feng, Ming
  • Shi, Xingxing
  • Ma, Tao
  • Feng, Zhichao
  • Zhang, Xiongwei
  • Sun, Qing
  • Xu, Yong

Abstract

Provided are a method and device for preparing adiponitrile. The preparation method of the present invention comprises the steps of a first hydrocyanation reaction, an isomerization reaction and a second hydrocyanation reaction, wherein on-line Raman spectroscopy is used for detecting the content of a specific ingredient in the system; and on the basis of the detection results, the reaction conditions are regulated, so as to achieve precise control over a substance in each step in the reaction system. The method of the present invention can reduce the amount of butadiene, thereby reducing the subsequent energy consumption needed for recycling butadiene and equipment investment after reaction; by means of the real time monitoring of the content of hydrocyanic acid, the residue of hydrocyanic acid is reduced to a lower level, and the operation safety and the stability of a catalyst during reaction are improved; and the loss of the catalyst is reduced.

IPC Classes  ?

  • C07C 253/10 - Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds to compounds containing carbon-to-carbon double bonds
  • C07C 255/04 - Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton containing two cyano groups bound to the carbon skeleton

15.

SEMI-AROMATIC POLYAMIDE THERMOPLASTIC ELASTOMER AND CONTINUOUS PRODUCTION METHOD THEREFOR

      
Application Number CN2020120153
Publication Number 2021/129045
Status In Force
Filing Date 2020-10-10
Publication Date 2021-07-01
Owner ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Du, Weiyuan
  • Deng, Hangjun
  • Zhou, Guiyang
  • Zhu, Danqi
  • Wu, Xiaoxiao
  • Hong, Wengang
  • Shen, Jintao

Abstract

A continuous production method for a semi-aromatic polyamide thermoplastic elastomer, comprising: mixing an aromatic dibasic acid, a diamine and a molecular weight regulator with water and a catalyst to form a slurry, and then dissolving at an elevated temperature to form a salt solution, the molecular weight regulator being selected from dibasic acid monoesters; dehydrating the salt solution prepared in the previous step and then carrying out a pre-polymerization reaction, performing flash evaporation on the obtained pre-polymerization reaction liquid; and then completing a post-condensation reaction between the product resulting from flash evaporation and a polymer polyol under the action of a transesterification catalyst. The described production process uses non-toxic and inexpensive aromatic dibasic acid as a raw material to prepare a semi-aromatic polyamide thermoplastic elastomer, has high reaction activity and a short reaction time, uses a molten system reaction, does not use an organic solvent, and is environmentally friendly. The prepared semi-aromatic polyamide thermoplastic elastomer is mainly terminated by ester groups, has excellent thermodynamic and mechanical properties, and also has excellent hydrolysis resistance.

IPC Classes  ?

16.

CONTINUOUS WASHING PROCESS FOR POLYPHENYLENE SULFIDE SLURRY

      
Application Number CN2020113369
Publication Number 2021/073301
Status In Force
Filing Date 2020-09-04
Publication Date 2021-04-22
Owner ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Gao, Bibo
  • Wei, Guanghui
  • Zhang, Xiongwei
  • Wang, Liangchu
  • Zhou, Guiyang
  • Qin, Guangde
  • Hu, Deng

Abstract

Disclosed is a continuous washing process for a polyphenylene sulfide (PPS) slurry, which mainly comprises the following steps: pressurizing and heating a PPS slurry, and then feeding same to the top of a washing tower, while feeding a high-temperature washing liquid to the bottom of the washing tower; using the high-temperature washing liquid in the tower to perform countercurrent washing on the PPS slurry to obtain a washed PPS resin at the bottom of the tower. The process significantly improves the washing efficiency, and the salt content of the product can be reduced to less than 0.2%.

IPC Classes  ?

17.

Preparation method for 4-phenylthio-benzenethiol

      
Application Number 16955511
Grant Number 11220478
Status In Force
Filing Date 2018-07-12
First Publication Date 2021-01-14
Grant Date 2022-01-11
Owner
  • Zhejiang NHU Company Ltd. (China)
  • Zhejiang University (China)
  • Zhejiang NHU Special Materials Co., Ltd. (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Yin, Hong
  • Zhou, Guíyang
  • Li, Haoran
  • Pan, Shuaifeng
  • Lian, Ming
  • Qin, Guangde
  • Li, Qichuan

Abstract

The present disclosure discloses a preparation method for 4-phenylthio-benzenethiol. The preparation method comprises the following steps: subjecting phenyl sulfide as a raw material to a halogenation reaction to obtain 4-halophenyl sulfide; subjecting the 4-halophenyl sulfide to a sulfhydrylation reaction to obtain a 4-phenylthio-phenylthiolate; and subjecting the 4-phenylthio-phenylthiolate to acidification. The preparation method of the present disclosure avoids the use of materials such as thiophenol which pollutes the environment, and realizes efficient recycling of the reaction materials, solvents, water and the like. The preparation method of the present disclosure is a green process for the synthesis of 4-phenylthio-phenylthiol without organic waste, waste acid and waste water discharge.

IPC Classes  ?

  • C07C 319/20 - Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides by reactions not involving the formation of sulfide groups
  • C01D 5/02 - Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfatesPreparation of bisulfates

18.

Preparation method of polyphenylene sulfide resin, and polyphenylene sulfide resin prepared thereby

      
Application Number 16957934
Grant Number 11440996
Status In Force
Filing Date 2018-07-12
First Publication Date 2020-11-05
Grant Date 2022-09-13
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Li, Woyuan
  • Yin, Hong
  • Chen, Zhirong
  • Hu, Baishan
  • Zhou, Guiyang
  • Deng, Hangjun
  • Lian, Ming
  • Zhang, Xiongwei
  • Li, Qichuan
  • Zhao, Jiang

Abstract

A preparation method of a polyphenylene sulfide resin, and a polyphenylene sulfide resin prepared by the method using a sulfur-containing compound, an alkaline substance and p-dichlorobenzene as raw materials, a fatty acid as a polycondensation aid to carry out a polycondensation reaction. After purification treatment, a primary polyphenylene sulfide is obtained, which then reacts with a terminal-group adjusting agent at a high temperature to generate the polyphenylene sulfide resin resulting in high yield and low cost. The prepared polyphenylene sulfide resin has high reactivity, high melting crystallization temperature and excellent thermal stability. The resulting polyphenylene sulfide resin can be directly used for extrusion and injection molding.

IPC Classes  ?

  • C08G 75/0254 - Preparatory processes using metal sulfides
  • C08G 75/0213 - Polyarylenethioethers derived from monomers containing one aromatic ring containing elements other than carbon, hydrogen or sulfur
  • C08G 75/029 - Modification with organic compounds

19.

POLYARYLENE SULFIDE GRANULE, PREPARATION METHOD THEREFOR AND MOLDED PRODUCT THEREOF

      
Application Number CN2019110808
Publication Number 2020/186735
Status In Force
Filing Date 2019-10-12
Publication Date 2020-09-24
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • SHAOXING YUCHEN NEW MATERIALS CO., LTD (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Zhou, Guiyang
  • Deng, Hangjun
  • Yu, Mengfei
  • Huang, Ping
  • Wang, Xiang

Abstract

A polyarylene sulfide granule, a preparation method therefor and a molded product thereof, wherein the surface of the granule has a porous structure, functional additives are adsorbed on at least a part of the surface of the porous structure, and the granule comprises polyarylene sulfide particles and/or slices.

IPC Classes  ?

  • C08L 81/02 - PolythioethersPolythioether-ethers
  • C08K 5/13 - PhenolsPhenolates
  • C08K 5/524 - Esters of phosphorous acids, e.g. of H3PO3
  • C08J 3/20 - Compounding polymers with additives, e.g. colouring
  • D06M 101/30 - Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C08J 9/36 - After-treatment

20.

SPINNING METHOD AND APPARATUS

      
Application Number CN2019110820
Publication Number 2020/177322
Status In Force
Filing Date 2019-10-12
Publication Date 2020-09-10
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • SHAOXING YUCHEN NEW MATERIALS CO., LTD (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Deng, Hangjun
  • Zhou, Guiyang
  • Yu, Mengfei
  • Wang, Guowei

Abstract

A spinning method and apparatus. The method and apparatus are suitable for the production of polyarylene sulfide fibers having relatively high glass transition temperature. By adding the fibers into an oil bath storage tank, uniform heating during fiber drawing can be maintained and the heating temperature can be precisely controlled; the damage to equipment and to the quality of the fibers in an oil bath tank due to high temperature transmission of a heating medium is avoided, and the problem of insufficient utilization of the heating medium caused by the reduction of starting and stopping efficiency and the drastic change in the flow of the heating medium when the equipment is started or stopped is avoided.

IPC Classes  ?

  • D01D 5/14 - Stretch-spinning methods with flowing liquid stretching media
  • D01D 5/16 - Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins

21.

SEMI-AROMATIC POLYAMIDE RESIN AND PREPARATION METHOD THEREFOR

      
Application Number CN2019119738
Publication Number 2020/134735
Status In Force
Filing Date 2019-11-20
Publication Date 2020-07-02
Owner
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Yin, Hong
  • Deng, Hangjun
  • Zhou, Guiyang
  • Zhu, Danqi
  • Wu, Xiaoxiao
  • Hong, Wengang
  • Qiu, Guisheng
  • Li, Qichuan

Abstract

Disclosed are semi-aromatic polyamide and a preparation method therefor. The semi-aromatic polyamide is obtained by taking diamine, dibasic acid, and monoacid as main raw materials, and adding a specific end-capping agent for polymerization reaction. The semi-aromatic polyamide prepared in the present invention is good in thermal stability, and has a yellowness index of less than 20, a glass transition temperature of above 90°C, and a melting point of above 300°C, and can be applied to parts such as vehicle fuel pipelines, and electronic and electrical industries such as LED panels.

IPC Classes  ?

  • C08G 69/48 - Polymers modified by chemical after-treatment
  • C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
  • C08G 69/28 - Preparatory processes

22.

HIGH-MOLECULAR-WEIGHT POLYPHENYLENE SULFIDE RESIN AND PREPARATION METHOD AND USE THEREOF

      
Application Number CN2019102272
Publication Number 2020/125048
Status In Force
Filing Date 2019-08-23
Publication Date 2020-06-25
Owner
  • ZHEJIANG NHU CO., LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Yin, Hong
  • Hu, Baishan
  • Zhou, Guiyang
  • Lian, Ming
  • Qin, Guangde
  • Deng, Hangjun
  • Zhang, Xiongwei
  • Qiu, Guisheng
  • Wu, Kejun

Abstract

The present invention relates to a high-molecular-weight polyphenylene sulfide resin and preparation method and use thereof. In the present invention, sulfur-containing compound and halogenated aromatic compound are used as raw materials, and basic compound and fatty acid as polycondensation agent; a polycondensation reaction is performed, and, after purification, a polyphenylene sulfide primary product is obtained; said polyphenylene sulfide primary product is then reacted with a chain extender at high temperature to produce a high-molecular-weight polyphenylene sulfide resin. The preparation method of the present invention has high yield and low cost, and has the features of selective and controllable preparation of polyphenylene sulfide resins having different melt viscosities and molecular weights; the obtained polyphenylene sulfide resins have excellent heat resistance. The linear high-molecular-weight polyphenylene sulfide resin having high thermal stability obtained by the present invention can be used for the production of plate, pipe, and rod material, and, like metal, can be cut, ground, polished, drilled, and otherwise mechanically processed, and can also be used for making fibers, membranes, and films, and is especially suitable for automotive component parts, electronic/electrical devices, chemical engineering, and mechanical industries.

IPC Classes  ?

  • C08G 75/0209 - Polyarylenethioethers derived from monomers containing one aromatic ring
  • C08G 75/0227 - Polyarylenethioethers derived from monomers containing two or more aromatic rings
  • C08G 75/0259 - Preparatory processes using metal hydrogensulfides

23.

Production method of semi-aromatic polyamide, and semi-aromatic polyamide

      
Application Number 15779414
Grant Number 10844171
Status In Force
Filing Date 2017-06-29
First Publication Date 2020-02-20
Grant Date 2020-11-24
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU COMPANY LTD (China)
Inventor
  • Chen, Zhirong
  • Yin, Hong
  • Zhang, Qin
  • Wu, Xiaoxiao
  • Hong, Wengang
  • Deng, Hangjun
  • Zhou, Guiyang
  • Wang, Changze

Abstract

The present disclosure provides a production method of a semi-aromatic polyamide, and a semi-aromatic polyamide. Said production method of a semi-aromatic polyamide includes: step 1 of subjecting an initial charge of a diamine and a binary acid in an amine/acid molar ratio of less than 1.0 to form a slurry together with water and a catalyst, and subjecting the slurry to heating and dissolution to form a saline solution; step 2 of dehydrating said saline solution after detecting the composition thereof, detecting the content of diamine in a steam condensate from a dehydration unit, adjusting the amine/acid molar ratio to be larger than 1.0 by a molten diamine and a monoacid as a molecular weight regulator, and performing pre-polymerization; and step 3 of subjecting a pre-polymerization solution to post-polycondensation after vacuum flashing. The semi-aromatic polyamide of the present disclosure has a low gel content, excellent performance and extensive scope of application.

IPC Classes  ?

  • C08L 77/08 - Polyamides derived from polyamines and polycarboxylic acids from polyamines and polymerised unsaturated fatty acids
  • C08G 69/28 - Preparatory processes
  • C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids

24.

METHOD FOR DETECTING SODIUM POLYSULFIDE

      
Application Number CN2018093972
Publication Number 2019/134355
Status In Force
Filing Date 2018-07-02
Publication Date 2019-07-11
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Cao, Jiayue
  • Li, Woyuan
  • Deng, Hangjun
  • Lian, Ming
  • Zhou, Guiyang
  • Zhou, Junyao

Abstract

Provided is a method for detecting sodium polysulfide, comprising the following steps: a) adding an ammonium salt agent to an analyte, such that sodium polysulfide in the analyte reacts with the ammonium salt, and determining, by means of a potentiometric titration method, the titration end point to obtain a sulfur deposit; and b) performing, according to a molar quantity of ammonium ions in the ammonium salt agent consumed in step a) and a mass of the sulfur deposit, calculation to obtain a sodium polysulfide content in the analyte.

IPC Classes  ?

  • G01N 31/16 - Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroupsApparatus specially adapted for such methods using titration

25.

PREPARATION METHOD FOR POLYPHENYLENE SULFIDE AND POLYPHENYLENE SULFIDE PREPARED BY MEANS OF SAME

      
Application Number CN2018095465
Publication Number 2019/128189
Status In Force
Filing Date 2018-07-12
Publication Date 2019-07-04
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Li, Woyuan
  • Yin, Hong
  • Chen, Zhirong
  • Hu, Baishan
  • Zhou, Guiyang
  • Deng, Hangjun
  • Lian, Ming
  • Zhang, Xiongwei
  • Li, Qichuan
  • Zhao, Jiang

Abstract

A preparation method for polyphenylene sulfide, and polyphenylene sulfide prepared by means of the same. The method comprises: carrying out a polycondensation reaction by using an alkaline substance and p-dichlorobenzene as raw materials and by using fatty acid as a polycondensation additive, obtaining a primary product of polyphenylene sulfide after performing purification processing, then reacting the same with a terminal regulator at a high temperature to produce polyphenylene sulfide. The preparation method has a high yield and is low cost, and the prepared polyphenylene sulfide has high reactive activity, high melting crystallization temperature and excellent heat resistance. The polyphenylene sulfide may be directly used for extrusion and injection, and is particularly suitable for the fields of automobile parts, electronic/electrical equipment, the chemical industry, the machinery industry, and so on.

IPC Classes  ?

26.

PREPARATION METHOD FOR 4-PHENYLTHIO-BENZENETHIOL

      
Application Number CN2018095380
Publication Number 2019/119785
Status In Force
Filing Date 2018-07-12
Publication Date 2019-06-27
Owner
  • ZHEJIANG NHU COMPANY LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Yin, Hong
  • Zhou, Guiyang
  • Li, Haoran
  • Pan, Shuaifeng
  • Lian, Ming
  • Qin, Guangde
  • Li, Qichuan

Abstract

Disclosed in the present invention is a preparation method for 4-phenylthio-benzenethiol. The preparation method comprises the following steps: subjecting phenyl sulfide as a raw material to a halogenation reaction to obtain 4-halophenyl sulfide; subjecting the 4-halophenyl sulfide to a sulfhydrylation reaction to obtain a 4-phenylthio-phenylthiolate; and subjecting the 4-phenylthio-phenylthiolate to acidification. The preparation method of the present invention avoids the use of materials such as thiophenol which pollute the environment, and realizes efficient recycling of the reaction materials, solvents, water and the like. The preparation method of the present invention is a green process for the synthesis of 4-phenylthio-phenylthiol without organic waste, waste acid and waste water discharge.

IPC Classes  ?

  • C07C 319/20 - Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides by reactions not involving the formation of sulfide groups
  • C07C 323/09 - Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and halogen atoms, or nitro or nitroso groups bound to the same carbon skeleton having sulfur atoms of thio groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton

27.

METHOD FOR PRODUCING SEMI-AROMATIC POLYAMIDE AND SEMI-AROMATIC POLYAMIDE

      
Application Number CN2017090830
Publication Number 2018/120702
Status In Force
Filing Date 2017-06-29
Publication Date 2018-07-05
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Chen, Zhirong
  • Yin, Hong
  • Zhang, Qin
  • Wu, Xiaoxiao
  • Hong, Wengang
  • Deng, Hangjun
  • Zhou, Guiyang
  • Wang, Changze

Abstract

A method for producing a semi-aromatic polyamide and a semi-aromatic polyamide. The method for producing the semi-aromatic polyamide comprises: step 1, forming a slurry by mixing an initial charge of a diamine and a dibasic acid with an amine/acid molar ratio being less than 1.0 and water as well as a catalyst, heating the slurry and dissolving same into a salt solution; step 2, detecting the composition of the salt solution, then dehydrating the salt solution, detecting the content of the diamine in steam condensate discharged from the dehydrating device, and using a molten diamine and a molecular weight regulator monobasic acid to adjust the amine/acid molar ratio to more than 1.0, so as to perform prepolymerization; and step 3, reducing the pressure of a prepolymerization reaction liquid and performing flash evaporation to perform post-polycondensation. The semi-aromatic polyamide product prepared in the method has a low gel content and excellent properties, and is suitable for a wide range of applications.

IPC Classes  ?

  • C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
  • C08G 69/28 - Preparatory processes

28.

POLYPHENYLENE SULFIDE HAVING LOW CHLORINE CONTENT, PREPARATION METHOD THEREFOR, RESIN COMPOSITION, AND FORMED BODY

      
Application Number CN2017104399
Publication Number 2018/120954
Status In Force
Filing Date 2017-09-29
Publication Date 2018-07-05
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Zhou, Guiyang
  • Yin, Hong
  • Lian, Ming
  • Pan, Shuaifeng
  • Deng, Hangjun

Abstract

A polyphenylene sulfide having a low chlorine content, a preparation method therefor, a resin composition, and a formed body; the polyphenylene sulfide having a low chlorine content is obtained by capping 4-thiophenyl-thiophenol. The preparation method of the polyphenylene sulfide uses a sulfocompound, an alkaline substance and p-dichlorobenzene as raw materials, a fatty acid as a polycondensation additive, and 4-thiophenyl-thiophenol (PTT) as a terminal group modifier for condensation polymerization. Product yield is high and cost is low; the obtained polyphenylene sulfide product has low chlorine content, and also has excellent flowability and heat resistance; thus, the product can satisfy the use requirements for low chlorine and high flowability in the electronic and electric trade.

IPC Classes  ?

  • C08G 75/0259 - Preparatory processes using metal hydrogensulfides
  • C08G 75/0209 - Polyarylenethioethers derived from monomers containing one aromatic ring
  • C08L 81/02 - PolythioethersPolythioether-ethers

29.

Fiber grade polyphenylene sulfide resin synthesis method

      
Application Number 14655326
Grant Number 09567440
Status In Force
Filing Date 2013-10-29
First Publication Date 2015-12-03
Grant Date 2017-02-14
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD. (China)
  • ZHEJIANG UNIVERSITY (China)
  • SHANGYU NHU BIOLOGICAL CHEMICAL CO., LTD. (China)
  • ZHEJIANG NHU COMPANY LTD. (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Li, Haoran
  • Lian, Ming
  • Yin, Hong
  • Zhou, Guiyang
  • Zheng, Xinfeng

Abstract

4, and whiteness is over 90, it can satisfy requirements for fiber polyphenylene sulfide resin. C5-C6 fatty acid salt according to the method of the present invention has a higher solubility in NMP, which can better promote polymerization. It is to be fully diverted into the filtrate after filter prior to conversion into free fatty acid again through acidification with hydrochloric acid. C5-C6 fatty acid is available for azeotropy with water, which has a limited solubility in water. Therefore, it is applicable to recycle C5-C6 fatty acid from the filtrate through azeotropy with water, and thereby solve the problem with separation of additive and sodium chloride that are soluble in water.

IPC Classes  ?

  • C08G 75/16 - Polysulfides by polycondensation of organic compounds with inorganic polysulfides
  • C08G 75/00 - Macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon
  • C08G 75/02 - Polythioethers

30.

METHOD FOR SYNTHESIZING FIBRE-GRADE POLYPHENYLENE SULPHIDE RESIN

      
Application Number CN2013086096
Publication Number 2014/101564
Status In Force
Filing Date 2013-10-29
Publication Date 2014-07-03
Owner
  • ZHEJIANG NHU SPECIAL MATERIALS CO., LTD (China)
  • ZHEJIANG UNIVERSITY (China)
  • SHANGYU NHU BIOLOGICAL CHEMICAL CO., LTD (China)
  • ZHEJIANG NHU COMPANY LTD (China)
Inventor
  • Chen, Zhirong
  • Li, Woyuan
  • Li, Haoran
  • Lian, Ming
  • Yin, Hong
  • Zhou, Guiyang
  • Zheng, Xinfeng

Abstract

Disclosed is a method for synthesizing a fibre-grade polyphenylene sulphide resin, comprising synthesizing via a polycondensation reaction by using a sodium hydrosulphide solution and p-dichlorobenzene as raw materials, N-methyl-2-pyrrolidone as a solvent, and a C5-C6 fatty acid salt formed by dehydration of a C5-C6 fatty acid and sodium hydroxide as an auxiliary for the polycondensation reaction. The reaction liquid is subjected to acidification and washing to obtain a white polyphenylene sulphide resin, the melt flow rate of the product is less than 125 g/10 min, the weight-average molecular weight measured by GPC is greater than 4.2 × 104, and the whiteness is higher than 90, meeting the requirements of the fibre-grade polyphenylene sulphide resin. In the method of the present invention, the C5-C6 fatty acid salt used has good solubility in NMP and can better promote the polycondensation reaction, all of it enters a filtrate after reaction and filtration, and it is again converted into a free fatty acid through acidification with hydrochloric acid; and the C5-C6 fatty acid can co-boil with water, has low solubility in water, and can be recovered from the filtrate by the method of co-boiling with water, thereby avoiding the problem that both the auxiliary and sodium chloride are dissolved in water and cannot be separated and recovered.

IPC Classes  ?