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Amphoteric dry strength agent and preparation method thereof

A dry strength agent and amphoteric technology, which is applied in the field of amphoteric dry strength agent and its preparation, can solve the problems of not obvious improvement of stiffness and ring compressive strength, large amount of addition, easy mildew and easy degradation, etc., and achieves excellent application effect, Improve the effect of dry strength index

Active Publication Date: 2014-01-29
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the starch-based reinforcing agent is added in a large amount, and it is prone to mildew and degradation for a long time; when polyacrylamide is used alone, the improvement of stiffness and ring compressive strength is not obvious

Method used

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  • Amphoteric dry strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Etherification reaction: Add 314 parts of deionized water in a four-necked flask equipped with stirring, thermometer, ventilation pipe and dropping pipe, start stirring, ventilate nitrogen, add 40 parts of cornstarch under stirring, heat up to After stirring for 30 minutes at 40°C, add 1.7 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride with an effective weight content of 69%, 0.4 parts of hydrogen peroxide, adjust the pH value of the solution to 9.0 with sodium hydroxide, and Reacted for 2 hours at this temperature;

[0022] (2) Cyanide reaction: Add 0.4 part of acrylonitrile, heat up the system to 90°C to form a gelatinized liquid, react at this temperature for 2 hours, adjust the pH value of the solution to 7.0 with hydrochloric acid, and obtain a translucent light yellow solution;

[0023] (3) Grafting reaction: Add 30 parts of acrylamide and 14 parts of cationic monomer methacryloyloxyethyltrimethylammonium chloride with a weight concentration of 69...

Embodiment 2

[0025] (1) Etherification reaction: Add 312 parts of deionized water in a four-necked flask equipped with stirring, thermometer, ventilation pipe and dropping pipe, start stirring, ventilate nitrogen, add 48 parts of wheat starch under stirring, heat up to After stirring for 20 minutes at 60°C, add 2.8 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride with an effective weight content of 69%, 1.0 parts of hydrogen peroxide, adjust the pH value of the solution to 9.5 with sodium hydroxide, and Reaction at this temperature for 1.0 hour;

[0026] (2) Cyanide reaction: add 0.7 parts of acrylonitrile, heat up the system to 90°C to form a gelatinized liquid, react at this temperature for 1.5 hours, adjust the pH value of the solution to 7.5 with hydrochloric acid, and obtain a translucent light yellow solution;

[0027] (3) Grafting reaction: 24 parts of acrylamide and 11 parts of cationic monomer acryloyloxyethyltrimethylammonium chloride with a weight concentration of 60%...

Embodiment 3

[0029] (1) Etherification reaction: Add 309 parts of deionized water in a four-necked flask equipped with stirring, thermometer, ventilation pipe and dropping pipe, start stirring, ventilate nitrogen, add 55 parts of tapioca starch under stirring, heat up to After stirring for 10 minutes at 60°C, add 4.0 parts of 3-chloro-2-hydroxypropyltrimethylammonium chloride with an effective weight content of 69%, 1.7 parts of hydrogen peroxide, adjust the pH value of the solution to 10.0 with sodium hydroxide, and Reaction at this temperature for 1.0 hour;

[0030] (2) Cyanide reaction: add 1.1 parts of acrylonitrile, heat the system to 95°C to form a gelatinized liquid, react at this temperature for 2 hours, adjust the pH value of the solution to 8.0 with hydrochloric acid, and obtain a translucent light yellow solution;

[0031] (3) Grafting reaction: adding 26 parts of acrylamide and 15 parts of cationic monomer dimethyl diallyl ammonium chloride with a weight concentration of 60% in...

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Abstract

The invention discloses an amphoteric dry strength agent and a preparation method thereof. The preparation method comprises the following steps: firstly, adding an etherifying agent and an oxidizing agent into starch milk for reacting in the atmosphere of nitrogen gas; secondly, adding acrylonitrile in the mixture for reacting, adding an acidic material and adjusting the pH value of the system to 7-8; and thirdly, adding acrylamide, a cation monomer and an initiator and reacting, reducing the temperature to room temperature, sieving and discharging to obtain the amphoteric biological dry strength agent. According to the amphoteric dry strength agent disclosed by the invention, a large amount of positive charges exist in the amphoteric dry strength agent and cationoid of the amphoteric dry strength agent is adsorbed on the surface of fiber, so that trace amount of the amphoteric dry strength agent is added in the pulp is realized, no retention aid is required; in addition, the defects of starch and polyacrylamide dry strength agents are avoided and various dry strength indexes of paper can be remarkably improved.

Description

technical field [0001] The invention relates to an amphoteric dry strength agent and a preparation method thereof. technical background [0002] With the improvement of people's living standards, the demand and consumption of paper continue to increase, but my country's forest resources are insufficient, and a large number of wood fiber raw materials are used to make paper. Therefore, research and development are suitable for paper production, especially grass, waste paper and other short fiber raw materials. High-efficiency and cheap enhancers are very necessary. [0003] At present, the commonly used paper-making strengthening agents in China are mainly modified starch and polyacrylamide-type strengthening agents. Starch and its derivatives have the advantages of abundant resources, low price, and biodegradable chemical modifiers. However, compared with starch, polypropylene Amides have the advantage of being able to obtain an excellent reinforcing effect with a small amou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/48C08F220/34C08F226/02C08B31/18C08B31/08D21H21/18D21H17/45
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS