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Water-soluble polymer dispersion liquid, paper strength agent, papermaking filter aid and papermaking retention agent

A water-soluble polymer and dispersion technology, which is applied in the addition of retention aids, reinforcements, textiles and papermaking, etc., can solve the problems of insufficient paper strength, insufficient paper texture, and inability to obtain dispersions. Excellent storage stability

Active Publication Date: 2011-08-17
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this method, it is possible to obtain a dispersion that can improve drainage and retention, but in the case of using the dispersion obtained by this method, the strength of the paper cannot be sufficiently improved; in addition, since a uniform dispersion cannot be obtained, the The quality of the paper is insufficient; further, the dispersion liquid obtained by this method produces sediment during storage, and there is a problem of storage stability such as poor performance

Method used

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  • Water-soluble polymer dispersion liquid, paper strength agent, papermaking filter aid and papermaking retention agent
  • Water-soluble polymer dispersion liquid, paper strength agent, papermaking filter aid and papermaking retention agent
  • Water-soluble polymer dispersion liquid, paper strength agent, papermaking filter aid and papermaking retention agent

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0054] (Production example 1) Production of polymer dispersant

[0055] In a 2-liter five-necked liquid separator (separable flask) with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen inlet pipe, add an 80% aqueous solution of acrylic acid-N,N-dimethylaminoethyl chloride methyl quaternary ammonium salt 228.48g (weight of pure compound 182.784g; 79.73 mol%), 0.09g (0.05 mol%) sodium methallylsulfonate, 0.23g (0.2 mol%) N,N-dimethylacrylamide, 0.059g (0.02 mol %) 1,3,5-triacryloylhexahydro-1,3,5-triazine, 16.83 g (20 mol %) acrylamide, 533.9 g of ion-exchanged water, heated to 60°C and replaced with nitrogen. Thereto was added 20 g of a 2% aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride as a polymerization initiator, and polymerization was started under stirring. The reaction was carried out for 2 hours to obtain a polymer dispersant having a branched chain structure.

manufacture example 2

[0056] (Production example 2) Production of polymer dispersant

[0057] Add 228.19g (182.552g of pure compound weight; 79.63mol%) of acrylic acid-N,N-dimethylamino 80% aqueous solution of ethyl chloride methyl quaternary ammonium salt, 0.37g (0.2 mol%) sodium methallylsulfonate, 0.12g (0.1 mol%) N, N-dimethylacrylamide, 0.1277g (0.07 mol%) %) methylenebisacrylamide, 16.83g (20mol%) acrylamide, 533.96g ion-exchanged water, heated to 60°C and replaced with nitrogen. Thereto was added 20 g of a 2% aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride as a polymerization initiator, and polymerization was started under stirring. The reaction was carried out for 2 hours to obtain a polymer dispersant having a branched chain structure.

Embodiment 1

[0077] (Example 1) Production of Water-Soluble Polymer Dispersion

[0078] In a five-necked separatory flask of 2 liters with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen inlet pipe, in 1030.3 g of ion-exchanged water, dissolve 110 g of the polymer dispersant with a branched chain structure obtained in Manufacturing Example 1 ( 20% of non-volatile matter; 5.5 weight part) and 400 g of ammonium sulfates with respect to 100 weight part of obtained (A) components. Add 216.38g (74.995mol%) acrylamide, 196.48g (157.184g of pure compound weight; 20mol%) 80% aqueous solution of acrylic acid-N, N-dimethylaminoethyl methyl chloride quaternary ammonium salt, 26.4 g (5 mol%) itaconic acid, 0.0313g (0.005 mol%) methylenebisacrylamide, heated to 45°C and replaced with nitrogen. 20 g of a 2% aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride was added thereto as a polymerization initiator, and polymerized under stirring for 24 hours to obtain a water-soluble...

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Abstract

The invention provides a water-soluble polymer dispersion liquid with excellent preservation stability, a paper strength agent stabling paper quality and enhancing paper strength, a papermaking filter aid and a papermaking retention agent. The dispersion liquid disperses a water-soluble polymer (A) into particles with average diameters of 0.1-100 micrometers in a saline solution of which the salt concentration is higher than 10 weight % and lower than a saturation concentration by using a polymeric dispersant (B), wherein the content of the water-soluble polymer (A) is 10-40 weight %, and the viscosity of the dispersion liquid is 3,000-20,000 mPa.s. The polymeric dispersant (B) contains 10-99.979 mol% of cationic free radical polymeric monomers (b1), 0.01-1mol% of monomers with (methyl) allyl (b2), 0.001-0.1 mol% of crosslinking monomers (b3) and 0.01-1 mol% of N-substituted (methyl) acrylamides (b4) represented by the formula CH2=C(R1)-CONR2(R2) (wherein, R1 represents hydrogen atoms or methyl; R2 independently represents straight or branched alkyl having 1-4 carbon atoms.

Description

technical field [0001] The present invention relates to a water-soluble polymer dispersion, a paper strength enhancer, a filter aid for papermaking (drainability improving agent) and a retention aid for papermaking (retention improving agent). Background technique [0002] Paper is attracting attention as a recyclable resource, and for paper and cardboard raw materials whose strength has been reduced due to reuse, paper strength enhancers are often used to reinforce the strength. [0003] As paper strengthening agent, acrylamide macromolecules are widely used. Usually, acrylamide macromolecules are obtained by copolymerization of acrylamide etc. with other polymerizable monomers in aqueous solution. The applicant has also proposed various paper strength enhancing agents ( See, for example, Patent Document 1 and Patent Document 2, etc.). However, by reusing paper for repeated use, the pulp used as paper raw material becomes short-fibered and deteriorated, and the concentrati...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F2/16D21H17/45D21H21/18D21H21/06D21H21/10
Inventor 藤冈大辅寺下嘉彦田邊景亮
Owner ARAKAWA CHEM IND LTD
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