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A kind of preparation method of paper strengthening agent

A paper strengthening agent and initiator technology, applied in the field of papermaking additives, can solve the problems of inability to fully improve the paper strength effect, poor performance, storage stability, and inability to obtain dispersion liquid, etc., to achieve easy control, reduced apparent viscosity, good fluidity

Active Publication Date: 2021-05-18
GUANGDONG PAPER IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all belong to the traditional water-in-water polymerization method. When the dispersion product obtained according to this method is used as a paper strengthening agent, the application effect is not ideal due to the low molecular weight, and the strength effect of the paper cannot be fully improved; in addition, because the dispersion product Most of them have high apparent viscosity and poor fluidity, and it is impossible to obtain a uniform dispersion, so the texture of the paper is insufficient; furthermore, the dispersion obtained by this method produces sediment during storage, and there is a storage stability problem such as poor performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a four-necked flask equipped with a thermometer and a stirrer, under the protection of nitrogen, add 60.0 grams of deionized water, 10.0 grams of sodium epoxy carboxymethyl cellulose with a mass concentration of 15%, and add 18.0 grams of ammonium sulfate after fully dissolving , 0.3 grams of ethylenediaminetetraacetic acid, 10 grams of acrylamide, 3.0 grams of methacryloxyethyltrimethylammonium chloride, 1.5 grams of acrylic acid and 0.1 grams of N, N-methylenebisacrylamide, and then add 1.5 The g mass concentration is 1% potassium persulfate and 1.0 g mass concentration 1% sodium bisulfite, the temperature is raised to 55 ° C, and the reaction is carried out for 60 min to obtain the seed polymer;

[0029] Add 300.0 grams of deionized water, 40.0 grams of acrylamide, 12.0 grams of methacryloyloxyethyltrimethylammonium chloride, 6.0 grams of acrylic acid, 0.3 grams of N,N-methylene to the above polymerized seed polymer solution Bisacrylamide and 7.5g of 1% 2,2-azo-bi...

Embodiment 2

[0031] In a four-necked flask equipped with a thermometer and a stirrer, under the protection of nitrogen, add 60.0 grams of deionized water, 13.0 grams of sodium epoxy carboxymethylcellulose with a mass concentration of 15%, and add 14.5 grams of ammonium sulfate after fully dissolving , 0.2 grams of citric acid, 10 grams of acrylamide, 3.0 grams of methacryloyloxyethyltrimethylammonium chloride, 1.5 grams of acrylic acid and 0.1 grams of N, N-methylenebisacrylamide, and then add 1.5 grams of mass concentration 1% potassium persulfate and 1.0g mass concentration of 1% sodium bisulfite, heated to 50°C, and reacted for 70 minutes to obtain a seed polymer;

[0032] Add 300.0 grams of deionized water, 40.0 grams of acrylamide, 12.0 grams of methacryloyloxyethyltrimethylammonium chloride, 6.0 grams of acrylic acid, 0.3 grams of N,N-methylene to the above polymerized seed polymer solution Bisacrylamide and 7.5g of 1% 2,2-azo-bis(2-amidinopropane) hydrochloride were heated up to 75°...

Embodiment 3

[0034] In a four-necked flask equipped with a thermometer and a stirrer, under the protection of nitrogen, add 50.0 grams of deionized water, 12.0 grams of sodium epoxymethyl cellulose with a mass concentration of 15%, and add 15.0 grams of ammonium chloride after fully dissolving , 0.3 grams of ethylenediaminetetraacetic acid, 10 grams of acrylamide, 3.0 grams of dimethylaminoethyl methacrylate, 1.5 grams of itaconic acid and 0.1 grams of N, N-methylenebisacrylamide, and then add 1.5 grams of mass The concentration is 1% potassium persulfate and 1.0g mass concentration of 1% sodium bisulfite, the temperature is raised to 45°C, and the reaction is carried out for 90 minutes to obtain the seed polymer;

[0035] Add 210.0 g of deionized water, 40.0 g of acrylamide, 12.0 g of dimethylaminoethyl methacrylate, 6.0 g of itaconic acid, and 0.3 g of N,N-methylenebispropene to the above polymerized seed polymer solution Amide and 7.5g of 1% 2,2-azo-bis(2-amidinopropane) hydrochloride, ...

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Abstract

A paper strengthening agent, which contains an amphoteric polyacrylamide aqueous dispersion, the preparation steps of which are: adding part of the main monomers to the aqueous medium in which a chelating agent, a dispersion stabilizer and an inorganic salt are dissolved, and passing through the early initiator Polymerize to obtain a seed polymer; then add deionized water, remaining main monomers and late-stage initiators to the seed polymer to perform a polymerization reaction to obtain an amphoteric polyacrylamide water-in-water dispersion solution; the apparent viscosity of the amphoteric polyacrylamide water-in-dispersion solution A water-in-water polymer emulsion with small size, good fluidity, large molecular weight, uniform particle size, and excellent storage stability; this dispersion product can be added to the slurry or sprayed into the wet paper in the wire section to enhance the strength of the paper, including Improve the tensile strength, burst strength, ring crush strength and surface strength of paper, and improve the retention and drainage effect in the papermaking process.

Description

technical field [0001] The invention belongs to the technical field of papermaking auxiliary agents, and in particular relates to a preparation method of a paper strengthening agent. Background technique [0002] At present, most of the packaging paper uses recycled waste paper as raw material, but the strength of the paper is affected due to the short paper fibers, more impurities and poor mechanical strength of the waste paper. Therefore, it is necessary to add a paper strengthening agent to the slurry to improve the quality of the slurry and increase the strength of the paper. Currently in the paper industry, commonly used paper strengthening agents include modified starches, polyacrylamides, chitosan, polymer emulsions, phytochemicals and cellulose derivatives. Polyacrylamide-based paper strengthening agents are the focus of research and have attracted extensive attention from scholars at home and abroad. Among them, amphoteric polyacrylamide has a good development pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/06C08F222/38C08F222/02D21H21/10D21H21/18
CPCC08F220/56D21H21/10D21H21/18C08F220/34C08F220/06C08F222/385C08F222/02
Inventor 许桂红刘晴杨桂珍戴尚志
Owner GUANGDONG PAPER IND RES INST
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