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Method for synthesizing cationic starch

A technology of cationic starch and cationic etherification agent, which is applied in the field of synthesis of cationic starch, can solve the problems of difficult sewage treatment, low reaction efficiency, low degree of substitution, etc., and achieve the effect of moderate viscosity, high purity and moderate degree of substitution

Inactive Publication Date: 2008-05-14
SHANDONG TAIYANGZHIYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process has the characteristics of uniform reaction and good product quality, but it can only prepare cationic starch with a low degree of substitution, usually DS<0.1, and the reaction efficiency (RE) is also low, generally RE is 60%-63%, and at high At pH and slightly higher temperature, starch, especially cassava starch, is prone to gelatinization, resulting in large losses. Wastewater contains a lot of salt, making it difficult to treat sewage

Method used

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  • Method for synthesizing cationic starch
  • Method for synthesizing cationic starch
  • Method for synthesizing cationic starch

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In a 250ml three-neck round bottom flask equipped with an electric stirrer, add 25g of sweet potato starch and 58ml of water to form a starch suspension. After mixing evenly, slowly add 25ml of 3% NaOH solution dropwise, and alkalize at 40°C for 15 minutes. Slowly add a cationic etherification agent of 6.0% starch mass for 45 minutes, and then raise the temperature to 90° C. for 2 hours. Cool down, neutralize with 5 mole hydrochloric acid, and get the finished product after treatment. The 3% gelatinized solution was placed at room temperature for 100 hours without stratification. The degree of substitution of the finished product synthesized in this embodiment is 0.039.

Embodiment 2

[0031] In a 250ml three-necked round-bottom flask, equipped with an electric stirrer, add 25g of sweet potato starch and 62.2ml of water to form a starch suspension. After mixing evenly, slowly add 20.8ml of 3% NaOH solution dropwise, and alkalize at 40°C for 15 minutes Finally, a cationic etherification agent of 6.0% by weight of the starch was slowly added dropwise for 45 minutes, and then the temperature was raised to 90° C. for 2 hours. Cool down, neutralize with 5 mole hydrochloric acid, and get the finished product after treatment. The 3% gelatinized solution was placed at room temperature for 100 hours without stratification. The degree of substitution of the finished product synthesized in this embodiment is 0.022.

Embodiment 3

[0033] In a 250ml three-neck round bottom flask equipped with an electric stirrer, add 25g of sweet potato starch and 58ml of water to form a starch suspension. After mixing evenly, slowly add 25ml of 3% NaOH solution dropwise, and alkalize at 40°C for 15 minutes. Slowly add a cationic etherification agent of 6.0% starch mass for 45 minutes, and then raise the temperature to 60° C. for 4 hours. Cool down, neutralize with 5 mole hydrochloric acid, and get the finished product after treatment. The 3% gelatinized solution was placed at room temperature for 100 hours without stratification. The degree of substitution of the finished product synthesized in this embodiment is 0.028.

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Abstract

The invention relates to a method for synthesizing cationic starch at low cost, wherein sweet potato starch or corn starch is mixed with water to obtain starch suspension, and then the sodium hydroxide with weight of 1.5% to 3.0 % relative to starch as well as the cationic etherifying agent 3-chlorine-2- hydroxypropyl trimethyl ammonium chloride are dripped; subsequently, reaction is conducted for 2 to 4 hours at 40 DEG C to 90DEG C, followed by neutralization by dilute hydrochloric acid solution to reach pH 6.5 to 7.0; finally, rinsing, dewatering, drying and preparing are conducted to substitute the cationic starch within the range from 0.02 to 0.04, which can reach the yield of no less than 99% with the use amount of cationic etherifying agent reduced by about 50% and the reaction duration shortened by 4 to 7 hours. The product has the advantages of dramatic stability of 3% paste liquid, no stratification within 100 hours, high transparency, improved strength and quality of the finished paper in production of regenerative newsprint.

Description

technical field [0001] The invention relates to a method for synthesizing cationic starch. Background technique [0002] Cationic starch is an important derivative of starch ether. Because it has a positive charge and can be closely combined with negatively charged fine fibers and fillers, it is widely used in the wet end of papermaking as a reinforcement, retention, and drainage aid, which can significantly improve paper quality, reduce consumption, and reduce costs. There are many kinds of cationic starches, which can be divided into cationic starches such as tertiary amine type, quaternary ammonium type, primary amine type, secondary amine type and miscellaneous (such as imine, etc.) according to the structure of their amino compounds. Among them, quaternary ammonium type cationic starch is in It can be used and exists stably in a wide range of pH such as neutral and alkaline, so it has great commercial value. Highly substituted cationic starch can neutralize and remove...

Claims

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Application Information

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IPC IPC(8): C08B31/08
Inventor 王少光任俊莉应广东李树伦邱艳张淑侠
Owner SHANDONG TAIYANGZHIYE
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