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

A technology of water-soluble polymers and dispersions, applied in the direction of adding retention aids, reinforcing agents, etc., can solve problems such as deterioration, drainage, difficulty in improving retention, and increased concentration, and achieve the effect of improving drainage

Active Publication Date: 2011-10-05
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by reusing paper for repeated use, short fibers and deterioration of pulp as a paper raw material occur, and the concentration of inorganic substances or impurities in

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

[0049] (Manufacturing example 1) Manufacturing method of polymer dispersant

[0050]In a 2-liter five-necked liquid separator (separable flask) with a stirrer, a thermometer, a reflux cooling tube, and a nitrogen gas introduction tube, 250 g of an 80% by weight aqueous solution of acryloyloxyethyltrimethylammonium chloride (pure compound weight of 200g), 529g of ion-exchanged water, heated to 65°C and replaced with nitrogen. 20 g of a 5% by weight aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride was added thereto as a polymerization initiator, and polymerization was performed with stirring. The temperature was raised by self-heating, and the polymerization reaction was performed at 80° C. for 1 hour to obtain a polymer dispersant.

[0051] After adjusting the non-volatile content to 20% by weight, the temperature was adjusted to 25° C., and the viscosity of the obtained polymer dispersant was measured using a Vismetron viscometer (manufactured by Shibaura Syste...

manufacture example 2

[0052] (Manufacturing example 2) Manufacturing method of polymer dispersant

[0053] In a five-necked separatory flask of 2 liters with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen inlet pipe, add 249.99 g of an 80% by weight aqueous solution of acryloyloxyethyltrimethylammonium chloride (the weight of the pure compound is 199.992 g) g; 99.995 mol %), 0.008 g (0.005 mol %) of methylenebisacrylamide, 529.7 g of ion-exchanged water, heated to 50° C. and replaced with nitrogen. 20 g of a 1.5% by weight aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride was added thereto as a polymerization initiator, and polymerized with stirring. The temperature was raised by self-heating, and the polymerization reaction was performed at 80° C. for 1 hour to obtain a polymer dispersant.

manufacture example 3

[0054] (Manufacturing example 3) Manufacturing method of polymer dispersant

[0055] In a five-necked separatory flask of 2 liters with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen inlet pipe, add 215.63 g of an 80% by weight aqueous solution of acryloyloxyethyltrimethylammonium chloride (the weight of the pure compound is 172.5 g) g; 69.85 mole %), 0.1966 g (0.1 mole %) methylenebisacrylamide, 0.1 g (0.05 mole %) sodium methallyl sulfonate, 27.2 g (30 mole %) acrylamide, 536.47 g ion Exchange water, heat to 60°C and replace with nitrogen. 20 g of a 2 wt % aqueous solution of 2,2'-azobis(2-amidinopropane) hydrochloride was added thereto as a polymerization initiator, and the mixture was polymerized with stirring. The temperature was raised by self-heating, and the polymerization reaction was performed at 80° C. for 1 hour to obtain a polymer dispersant.

[0056] Table 1

[0057]

[0058] In the table, the numbers of (b1)-(b4) are mole %, the viscosity ...

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Abstract

The invention provides a water-soluble polymer dispersion liquid, a paper strength agent, a papermaking filter aid and a papermaking retention agent, which may not impair the paper quality and can maintain high filteration rate and enhance paper strength. The water-soluble polymer dispersion liquid, in a saline solution, of which the salt concentration is higher than 10 weight % and lower than a saturation concentration and at the presence of a polymeric dispersant (B), is a dispersion liquid obtained by dispersion polymerization of the free radical polymeric components (a) of at least cationic free radical polymeric monomers (a1), anionic free radical polymeric monomers (a2) and (methyl) acrylamide (a4). In a water diluted dispersion liquid where the total content of the component (A) and the component (B) of the dispersion liquid is 0.2 wt.%, the minimal turbidity of the diluted dispersion liquid ranges from 10NTU to 500NTU, when the pH value is 5-8.

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 used for various purposes and is attracting attention as a reusable resource. However, if recycling is carried out, in papermaking, when dehydration is performed from pulp as a raw material, water cannot be desorbed, resulting in problems such as a reduction in pulp retention. Therefore, in order to extract water from pulp, improve retention, and thereby improve paper production efficiency, water drainage agents, retention aids, or paper strength enhancers are currently used. [0003] As a method to solve the problem of low drainability and retention, it is currently proposed to use a dispersion of a water-soluble polymer dispersed in a saline solution as a retention aid and a drainage aid in a s...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F222/02C08F2/12D21H21/18D21H21/10
Inventor 藤冈大辅寺下嘉彦田邊景亮
Owner ARAKAWA CHEM IND LTD
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