The present invention relates to the field of molded fiber food packaging, in particular to a blend for wet-end molded fibers and the use thereof. The blend comprises the following components: a polymer containing a repeating unit derived from styrene and a repeating unit derived from an unsaturated carboxylic acid and/or containing a repeating unit derived from styrene and a repeating unit derived from an unsaturated acid anhydride; a polysaccharide (preferably starch); and wax. The blend of the present invention does not contain any PFAS components, thus meeting environmental protection requirements while avoiding possible health risks caused by PFAS. Moreover, the blend can be applied to a wet end, which is a non-surface treatment process, thereby better meeting the requirement of molded fiber food packaging for oil/grease resistance.
The present invention relates to a novel aqueous dispersion with high biomass content for use as barrier coatings on substrates. The biomass in the dispersion comprises a combination of fibrillated cellulose and polyhydroxyalkanoate (PHA). The aqueous dispersion of the present invention provides good water-resistance, oil-resistance and oxygen barrier property, and the heat sealability thereof is also good. Meanwhile, the production process of the aqueous dispersion is environmentally friendly and sustainable, and it can be applied by a simple coating process, thus it has important application prospects.
The present invention relates to a method for treating a chemimechanical pulping effluent. The method comprises the following steps: a) mixing a coagulant and an adsorbent with a chemimechanical pulping effluent; and b) mixing a flocculant with the effluent from step a). Compared with a traditional method, the effluent treatment method in the present invention has a better removal effect on suspended solids, turbidity and COD, and can reduce toxicity, decrease foam and improve the dryness of sludge, thereby exhibiting significant application prospects.
The present invention relates to the field of papermaking. In particular, the present invention relates to a method for preparing a sizing agent. The method of the present invention comprises the following steps: (1) pre-adding a first part of TEA of total TEA to a HEEL-containing reaction system to obtain a TEA-pre-added HEEL-containing reaction system; and (2) adding the remaining second part of TEA of the total TEA and FACl to the TEA-pre-added HEL-containing reaction system, and reacting same, wherein the weight percentage of the first part in the total TEA is not greater than 90% of the total TEA. The present method can reduce the viscosity of reaction systems, and/or achieves toluene-free operation.
The present invention relates to the technical field of film-forming compositions. In particular, the present invention relates to a biodegradable composition and a low-temperature film-forming process using same. The biodegradable composition of the present invention comprises a biodegradable polymer, a surfactant, a cross-linking agent, and a first additive.
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08L 67/04 - Polyesters derived from hydroxy carboxylic acids, e.g. lactones
The present invention relates to the field of papermaking. In particular, the present invention relates to a method for preparing a sizing agent, and a sizing agent prepared according to the method. The method can reduce the viscosity of a reaction system, and/or realize toluene-free operations.
The present invention relates to the field of paper. In particular, the present invention relates to a method for purifying a sizing agent. The method can produce a sizing agent having a reduced content of harmful components, and the sizing agent can be used for paper, especially food contact/packaging paper. In particular, the present invention relates to the use of anhydride of formula (VI) for reducing the amide content in an alkyl ketene dimer preparation method. Y-C(O)-O-C(O)-Z (VI).
Here is provided method relating to treating waste, more specifically sludges removed from paper or board production, such as recycled fibre (RCF) production. The disclosure relates to a method for treating said sludge in order to improve reusability thereof, particularly, as conditioned sludge in said paper or board production processes. Herein is also provided uses in a paper or board mill of said conditioned sludge obtained by said method.
What is dislcosed is a process for treating fibre material. The method comprises treating the fibre material in an aqueous medium with peroxide in presence of carboxyethylthiosuccinic acid. The process relates additionally to use of carboxyethylthiosuccinic acid as peroxide stabilizer.
D06M 15/19 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with macromolecular compoundsSuch treatment combined with mechanical treatment with synthetic macromolecular compounds
D06M 13/00 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with non-macromolecular organic compoundsSuch treatment combined with mechanical treatment
D06M 11/00 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereofSuch treatment combined with mechanical treatment, e.g. mercerising
11.
A METHOD FOR REMOVING METAL IONS FROM EFFLUENTS AND PROCESS WATERS
The present invention relates to a method for removing at least one metal ion from an effluent or a process water from a pulp mill or a paper mill. The method comprises treating the effluent or the process water with at least one salt of organic acid and/or at least one salt of inorganic acid to precipitate the metal ion in form of metal salt of organic acid and/or metal salt of inorganic acid. The present invention additionally relates to a use of at least one salt of organic acid and/or at least one salt of inorganic acid for removing at least one metal ion from an effluent or a process water from a pulp mill or a paper mill.
A method for preparing wet-lap wherein a combination of an inhibitor of amylase activity and a biocide are incorporated into the wet-lap. Wet-lap produced according to the method exhibits a reduced loss of fibre strength during storage.
A method for preparing wet-lap wherein a combination of an inhibitor of amylase activity and a biocide are incorporated into the wet-lap. The wet-lap produced according to the method exhibits a reduced loss of fibre strength during storage.
A polymeric structure, which is obtained by polymerisation of (meth) acrylamide and at least one charged monomer in a polymerisation medium comprising at least a first host polymer, which first host polymer comprises polyvinyl alcohol. The polymeric structure may be used in making of paper, board, tissue or the like as a strength agent, or in dewatering of sludge.
A typical dispersant comprises a copolymer of phosphono and carboxylic acid, at least 5-weight-% of a terpolymer consisting of (meth) acrylic acid and maleic acid monomers or their salts, at least 10 weight-% of acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer (AA/AMPS), and at least 5-weight-% of at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt (s). Use of the dispersant and a method for controlling, preventing and/or reducing the formation inorganic scale and/or deposits in an aqueous system are provided.
C02F 5/14 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
The invention relates to a polymer having a main chain which is obtained by free radical emulsion polymerisation of a monomer mixture, which comprises at least one optionally substituted styrene, at least one C1 –C4 alkyl (meth) acrylate and at least one ethylenically unsaturated monomer. The monomer mixture is polymerised in a reaction mixture comprising a natural and/or synthetic polymeric stabilator. According to the invention the polymer main chain further comprises a reaction product of silica sol and an unsaturated organosilicon compound. The invention relates also to methods of making such polymer.
Provided is a composition for use as a peroxide stabilizer in bleaching of pulp，which comprises an iminodisuccinic acid (IDS) or its salt (s), and a sodium salt of a polyaspartic acid (PASP).
A composition for pretreating landfill leachate on mechanical vapor recompression (MVR) evaporation process by which Mg, Ca and ammonia are efficiently removed is provided. The composition comprises 0.2–2 weight-% of cationic polymer, 5–80 weight-% of sodium and/or potassium phosphate, 5–40 weight-% of saccharide, and 5–40 weight-% of sodium and/or potassium carbonate, calculated from the total weight of the constituents in the composition, as dry. A method for pretreating landfill leachate on MVR evaporation process is provided. The composition is added to the landfill leachate prior to conveying the landfill leachate to the evaporation system.
Composition for stabilizing iron compounds in an aqueous environment, which comprises a polycarboxylic acid or its salt (s), at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt (s), at least one corrosion inhibitor comprising amino groups, and 1 -15 weight-%of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as active ingredient from the total weight of the constituents in the composition, as dry.
C02F 5/12 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
C02F 5/14 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
Disclosed are an aqueous emulsion of discrete droplets of polymer dispersed in a continuous water phase and the use of the emulsion．The emulsion comprises at least 3 weight-％ of at least one hydrophobic (meth)acrylate polymer, at least 0.01 weight-％ of hydrophobic microparticles, preferably silica based particles, at least 1 weight-％ of at least one surfactant, and at least 40 weight-％ of water, which forms the continuous phase of the emulsion．
It is disclosed a method of treating municipal and/or industrial sludge, comprising the steps of: a) providing the sludge, which has a pH of at least 6; b) adding a catalyst to the sludge; c) adding a radical initiator, selected from hydrogen peroxide and percompounds to the sludge; d) adding a polymer to the sludge to provide a chemically treated sludge; e) dewatering the chemically treated sludge in at least one stage to provide a dewatered sludge cake, wherein step b) and c) may be performed in any order.
Provided is a composition for controlling, preventing and/or reducing the formation of inorganic scale and/or deposits in an aqueous system. The composition comprises a copolymer of phosphinic acid and (meth) acrylic acid or its salt (s), a polycarboxylic acid or its salt (s), at least one monomeric phosphonate comprising phosphonic acid groups, at least one corrosion inhibitor comprising amine groups, and at least one chelating agent. Further disclosed is use of the composition in an aqueous system having water hardness as calcium carbonate in the range of 50–1500 ppm.
C02F 5/14 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
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