Disclosed are a compound phosphorus-nitrogen flame retardant, a flame-retardant regenerated cellulose fiber, and a preparation method. The compound phosphorus-nitrogen flame retardant comprises a compound mixture of a phosphoramidate compound and an inorganic compound, and the mass ratio of the phosphoramidate compound to the inorganic compound is (10-35):(0.1-10). The flame-retardant regenerated cellulose fiber comprises cellulose and the compound phosphorus-nitrogen flame retardant dispersed in a cellulose fiber matrix. The preparation method for the compound phosphorus-nitrogen flame retardant comprises: adding a dispersing aid into a dispersion medium and mixing well, then adding a phosphoramidate compound, carrying out uniform dispersion by ultrasonic dispersion or mechanical stirring, and then grinding, then adding an inorganic compound and a modifier, and grinding to obtain a compound phosphorus-nitrogen flame retardant slurry. The synergistic compounding of all the ingredients of the compound phosphorus-nitrogen flame retardant of the present invention achieves the purpose of efficient flame retarding and smoke suppression; the prepared flame-retardant regenerated cellulose fiber is non-toxic and environmentally friendly, exhibits low smoke concentration during combustion, and has permanent flame-retardant performance and excellent mechanical properties.
9090/φfiber is less than 0.1. The flame retardant is a nitrogen-based flame retardant; and the synergist is selected from one or more of an organic phosphorus compound, a metal oxide, a boron-containing compound and a non-water-soluble silicate. The Lyocell fiber is modified by using the compound flame retardant, and by controlling the particle size, the smoothness of a fiber spinning process can be guaranteed, and the compound flame retardant can be uniformly dispersed inside the fiber, so that the flame retardance of the fiber is obviously improved, and the fiber is resistant to water washing and has excellent flame retardant durability, being low cost and having zero emissions, and being green and environmentally friendly.
A continuous reactor for preparing polyester fibers, comprising: a reactor body (10) having at least two reaction chambers (11) disposed therein; a reaction slurry inlet (17), provided at a lower part of the reactor body (10) and in communication with a reaction chamber (11); a high-pressure injection apparatus, communicated with the slurry inlet (17) and used for spraying slurry into the reaction chamber (11), the slurry being sprayed into the reactor body (10) via the slurry inlet (17) by means of the high-pressure injection apparatus, and being quickly and uniformly mixed with material located inside the reactor body (10), thus avoiding agglomeration of particulate matter in the slurry.
B01J 19/18 - Stationary reactors having moving elements inside
B01J 4/00 - Feed devices; Feed or outlet control devices
D01F 6/92 - Monocomponent man-made filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
Disclosed is a continuous preparation method of cellulose fibers, in which a forming tension of 0.1 to 1.9 cN/dtex is applied to a fine solution stream obtained by extrusion through a spinneret plate and air gap cooling, then the fine solution stream is fed into a coagulating bath at a speed of 80 to 1000 m/min, a traction tension of 0.075 to 1.5 cN/dtex is continued to be applied to washed fibers in a water washing system behind the coagulating bath, and finally, the washed fibers are fed into a post-treatment system for continuous and efficient spinning of finished fibers at a speed of 80 to 1000 m/min.
A cellulose fiber continuous preparation method. In said preparation method, a shaping tension of 0.1-1.9 cN/dtex is applied to solution fine streams extruded through a spinneret and cooled by an air gap, then the obtained fine streams are fed into a coagulating bath at the speed of 80-1000 m/min, and a drawing tension of 0.075-1.5 cN/dtex is continued to be applied to washed fibers in a water-washing system behind the coagulating bath, and finally the washed fibers are sent to a post-treatment system so as to achieve continuous and efficient spinning of finished fibers at the speed of 80-1000 m/min. The preparation method can significantly reduce the problems such as obvious fibrillation, low fiber elongation and poor fiber uniformity of cellulose fibers drawn under a high speed, achieving the preparation of cellulose fibers at a high speed and with a high quality, thereby greatly increasing the production efficiency, reducing the production costs, and forming an efficient and continuous preparation method for cellulose fibers which is more suitable for industrial promotion.
CHINA TEXTILE INSTITUTE (TIANJIN) SCIENCE AND TECHNOLOGY DEVELOPMENT CO., LTD. (China)
Inventor
Li, Xin
Qiu, Zhicheng
Zhang, Houyu
Jin, Jian
Li, Zhiyong
Liu, Yulai
Wang, Xue
Ma, Xiao
Liu, Jianli
Abstract
A functional polyester production system, which relates to the technical field of polymer material synthesis. The functional polyester production system comprises a polyester main body production system and a functional powder slurry concentrate preparation system; the polyester main body production system comprises an esterification system, a pre-polycondensation system and a final polycondensation system that are connected in sequence; the functional powder slurry concentrate preparation system comprises an online addition device that is connected to the esterification system or/and to a site between the esterification system and the pre-polycondensation system. By introducing a functional powder slurry concentrate preparation system into a polyester main body production system, a functional powder slurry concentrate having a low hydroxyl value and low pressure filtration value may be continuously prepared, and the prepared functional powder slurry concentrate and a polyester oligomer are uniformly mixed and then undergo a polycondensation reaction to obtain functional polyester in which functional powder is highly uniformly dispersed. The present invention also relates to a functional polyester production method.
D01F 6/92 - Monocomponent man-made filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
CHINA TEXTILE ACADEMY（TIANJIN）SCIENCE AND TECHNOLOGY DEVELOPMENT CO., LTD (China)
Inventor
Duan, Taike
Li, Xin
Qu, Ximing
Yi, Chunwang
Jiang, Feng
Kong, Lingxi
He, Zhiqiang
Liu, Jing
Li, Jie
Wang, Ying
Abstract
A continuous polymerization process for use with a PA6-66 copolymer and a PA6-66 copolymer, wherein the PA6-66 copolymer is prepared by using three-stage continuous polymerization. Using an addition method which combines a solid nylon 66 salt and an aqueous solution of the nylon 66 salt such that caprolactam and the 66 salt are uniformly mixed before a reaction, and a highly random copolymer is obtained by means of polymerization. In the PA6-66 copolymer, content of PA66 salt percentage by mass may be up to 60%, while a melting point of the copolymer is between 162.6°C-210.6°C, and relative viscosity is between 2.4-3.6.
C08G 69/36 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from amino acids, polyamines, and polycarboxylic acids
8.
Process for preparing cellulose solution and equipment therefor
The present invention provides a process for preparing a cellulose solution. NMMO with a relatively low concentration and non-activated pulp are continuously mixed online, the mixed premix is dewatered in evaporation dewatering equipment until an NMMO concentration suitable for swelling is achieved, then, sufficient swelling is carried out under this condition, and the uniformly-mixed and sufficiently swelled pre-swelling solution is subjected to depressurized evaporation dewatering and dissolving by thin-film-evaporation equipment thereby obtaining a high-concentration, uniformly-dissolved and excellently-uniformity cellulose solution. The present invention further provides continuous preparation equipment for the process for preparing a cellulose solution. According to the present invention, the conflict between uniform mixing and sufficient swelling during the preparation of a high-concentration cellulose solution is solved, and problems in storage and transportation safety caused by using high concentration NMMO in the conventional technologies are prevented.
C08J 3/09 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
Disclosed in the present invention is a method for preparing cellulose fibre, comprising the following steps: 1) mixing cellulose pulp with NMMO water solution of a mass concentration of 60% to 85%, optimally 70% to 76%, to obtain a uniform mixture; 2) subjecting the obtained uniform mixture to dehydration swelling, dissolution, and deaeration to obtain cellulose spinning stock solution; 3) subjecting the obtained cellulose spinning stock solution to filtering and heat exchange, then introducing same into a spinning machine, extruding through a spinneret assembly, air cooling, introducing into a coagulation system, and coagulating in a 50%
The present invention provides a preparation process for a cellulose solution. The preparation process comprises: continuously mixing NMMO having a low concentration and non-activated pulp on line, and dehydrating the mixed pre-mixed solution in an evaporative dehydration device until the solution is up to the NMMO concentration suitable for swelling; then, sufficiently swelling under the condition; and carrying out reduced-pressure evaporation on the uniformly mixed and sufficiently swelled pre-mixed solution by means of a film evaporation device, dehydrating and dissolving to prepare the cellulose solution having a high concentration, a uniform dissolution and excellent consistency. The present invention also provides a cellulose solution continuous preparation device for the preparation process. The present invention solves the contradiction between mixing uniformity and swelling sufficiency in the preparation process of the high-concentration cellulose solution in the prior art, and avoids the problem of safety in storing and conveying the high-concentration NMMO in the traditional technology, and the pulp used in the present invention does not need to be activated, so that energy consumption is low. The technological process of the present invention is safer, more energy saving and more efficient, and is convenient for continuous industrial production.
C08J 3/09 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
D01F 2/00 - Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
EXCHANGE REACTION SYSTEM, MODIFIED POLYESTER PRODUCTION SYSTEM COMPRISING SAME, MODIFIED POLYESTER PRODUCTION METHOD AND MODIFIED POLYESTER FIBRE PRODUCT
Provided are an exchange reaction system, a modified polyester production system comprising same, a modified polyester production method and a modified polyester fibre product. The exchange reaction system comprises a vertical complete mixed flow reaction kettle and a vertical plug flow reaction kettle. The vertical complete mixed flow reaction kettle comprises a first material inlet and a first material outlet provided thereon; and the vertical plug flow reaction kettle comprises a second material inlet and a second material outlet provided thereon, wherein the vertical complete mixed flow reaction kettle is provided on the top wall of the vertical plug flow reaction kettle, and the first material outlet is in communication with the second material inlet. The exchange reaction system of such a directly connected structure can allow a material to quickly and conveniently enter the vertical plug flow reaction kettle under the action of gravity such that the exchange reaction conditions are close to a homogeneous phase, which thus improves the distribution uniformity of a modifier in the backbone of polyester molecules, and thereby the obtained modified polyester structure is highly uniform, and the system is suitable for producing high quality fibre and film products.
The present invention relates to a reaction or separation device, wherein the materials circularly flow in a container and a pipe. Said device contains a container and an external circular pipe, wherein the container is a double-chamber structure. The inner chamber consists of an outer cylinder and an inner cylinder with the latter being jacketed by the former, and there is a space between the walls of the outer cylinder and the inner cylinder. The lower end of the outer cylinder is open and higher than the bottom of the container, and the outer cylinder is fixed to the wall or bottom of the container. The upper end of the inner cylinder is open and its lower end connects with the external circular pipe through the feed outlet. A continuous passage is sequentially formed from the spaces between the wall of the outer cylinder and that of the container, between the lower end of the outer cylinder and the bottom of the container, between the wall of the outer cylinder and that of the inner cylinder, and in the inner cylinder. The external circular pipe connects with the bottom of the container and leads to the inner chamber, and connects with the sidewall at the lower part of the container and leads to the outer chamber, respectively. The present invention also relates to a continuous esterification process, which comprises feeding liquid reaction materials to the reaction device and carrying out reaction under reaction conditions.
B01J 10/00 - Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles; Apparatus specially adapted therefor
C07C 67/08 - Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
C07B 41/12 - Formation or introduction of functional groups containing oxygen of carboxylic acid ester groups
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