Cationic starch with ultrahigh substitution degree, and preparation method thereof

A technology of cationic starch and cationic etherification agent, which is applied in the field of materials, can solve the problems of easy gelatinization, difficult post-processing, high degree of substitution of cationic starch, etc., and achieve the effect of improving viscosity reduction efficiency and avoiding low viscosity reduction efficiency

Pending Publication Date: 2019-07-09
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing cationic starch with a super high degree of substitution, and also discloses cationic starch with a super high degree of substitution and its application. The cationic starch prepared by the preparation method has a degree of substitution of 0.4, solving the problem of high Degree of Substitution Cationic starch is easy to gelatinize during the production process, and post-processing is difficult, and the prepared cationic starch has a high degree of substitution

Method used

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  • Cationic starch with ultrahigh substitution degree, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A method for preparing cationic starch with a super high degree of substitution, the steps are as follows:

[0035] (1) 50 parts by weight of starch (tapioca starch) with a water content between 5% and 15% are added to a mixed solution of 100 parts by weight of water and an organic solvent (the weight ratio is 5:95, and the organic solvent is isopropanol) After stirring evenly, slowly add 5 parts by weight of alkali (sodium hydroxide) into the solution, and stir for 60 minutes.

[0036] (2) The solution was heated to 70° C., and after the temperature stabilized, 1 weight part of hydrogen peroxide (50%) was added to the solution and stirred for 6 hours.

[0037] (3) After adding 0 parts by weight of alkali (sodium hydroxide), 30 parts by weight of 2,3-epoxypropyltrimethylammonium chloride was added. The stirring reaction was continued for 1 hour.

[0038] (4) Add an appropriate amount of acid (acetic acid) after the reaction to neutralize the reaction. After being was...

Embodiment 2

[0040] (1) 50 parts by weight of starch (tapioca starch) with a water content between 5% and 15% are added to a mixed solution of 100 parts by weight of water and an organic solvent (the weight ratio is 40:60, and the organic solvent is isopropanol) After stirring evenly, slowly add 0.1 parts by weight of alkali (sodium hydroxide) into the solution, and stir for 60 minutes.

[0041] (2) The solution was heated to 40° C., and after the temperature stabilized, 25 parts of hydrogen peroxide (50%) was added to the solution and stirred for 0.5 hours.

[0042] (3) After adding 5 parts by weight of alkali (sodium hydroxide), 90 parts by weight of 2,3-epoxypropyltrimethylammonium chloride was added. The stirring reaction was continued for 6 hours.

[0043] (4) Add an appropriate amount of acid (acetic acid) after the reaction to neutralize the reaction. After being washed by centrifugation and dried, it is ground into powder to obtain cationic starch with a high degree of substituti...

Embodiment 3

[0045](1) 50 parts by weight of starch (tapioca starch) with a water content between 5% and 15% are added to a mixed solution of 100 parts by weight of water and an organic solvent (the weight ratio is 30:70, and the organic solvent is isopropanol) After stirring evenly, slowly add 2.5 parts by weight of alkali (sodium hydroxide) into the solution, and stir for 60 minutes.

[0046] (2) The solution was heated to 60° C., and after the temperature stabilized, 12.5 parts of hydrogen peroxide (50%) was added to the solution and stirred for 3 hours.

[0047] (3) After adding 2.5 parts by weight of alkali (sodium hydroxide), 60 parts by weight of 2,3-epoxypropyltrimethylammonium chloride was added. The stirring reaction was continued for 3 hours.

[0048] (4) Add an appropriate amount of acid (acetic acid) after the reaction to neutralize the reaction. After being washed by centrifugation and dried, it is ground into powder to obtain cationic starch with a high degree of substitut...

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Abstract

The invention discloses a preparation method of cationic starch with an ultrahigh substitution degree. The preparation method comprises the following steps: step 1, carrying out an alkalization reaction on starch; step 2, carrying out viscosity reduction on the mixture obtained in the step 1 by a viscosity reducer capable of hydrolyzing starch molecules; and step 3, carrying out etherification onthe mixture obtained in the step 2 in the presence of a cationic etherifying agent, and carrying out neutralizing and corresponding post-treatment to obtain the cationic starch with an ultrahigh substitution degree. The invention relates to the field of materials, and also discloses the cationic starch with an ultrahigh substitution degree and an application thereof. The substitution degree of thecationic starch prepared by the preparation method reaches 0.4, the problems of easy gelatinization and difficult post-treatment in a production process of the cationic starch with an ultrahigh substitution degree are solved, and the prepared cationic starch is high in substitution degree.

Description

technical field [0001] The invention relates to the field of materials, in particular to cationic starch with a super high degree of substitution and its preparation method and application. Background technique [0002] Cationic starch can improve the bursting strength, tensile strength and folding resistance of the paper industry, increase the retention rate of rosin and aluminum sulfate, increase the retention rate of fillers and fine fibers, improve the water filtration performance of paper materials, adjust High paper machine speed, reduce the consumption of drying steam, used as dispersant and stabilizer for latex and neutral sizing, improve the effect of neutral sizing, reduce the content of organic matter in papermaking white water, reduce BOD, and benefit the environment A series of advantages such as protection, and is widely used in the field of papermaking. The degree of substitution of such cationic starch is generally between 0.01-0.06. There are few cationic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12D21H21/16
CPCC08B31/125D21H21/16
Inventor 户献雷任少华赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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