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Cationic starch and its preparation method and application

A cationic starch, starch technology, applied in textiles and papermaking, water repellent addition, coating and other directions, can solve the problems of short stability time, uneven reaction, low electric double layer charge of AKD emulsion, and achieve good emulsion stabilization effect , to ensure the reaction efficiency and reduce the effect of gelatinization

Active Publication Date: 2016-08-17
GUANGZHOU TINCI MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The reason for the short stability time of AKD emulsions in the prior art is that the cationic starch used in AKD emulsions has a relatively low degree of cationic substitution, generally 0.03-0.05
The low degree of cationic substitution makes the binding strength between starch and AKD particles low, and the formed electric double layer has low charge and low electrostatic repulsion, which can easily cause delamination and other unstable phenomena.
Secondly, the reaction between starch and etherification agent is not uniform, and the positive charge distribution of the obtained cationic starch is not uniform, which makes the AKD emulsion unable to be stable for a long time

Method used

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  • Cationic starch and its preparation method and application

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Effect test

Embodiment 1

[0034] A kind of preparation method of cationic starch of the present embodiment, comprises the steps:

[0035] (1) 100g of corn starch and 300g of 75% ethanol aqueous solution are mixed and placed in a reaction vessel, and stirred for 30min;

[0036] (2) Add 7g of sodium hydroxide, stir and heat up to 55°C;

[0037] (3) Add 25g of 2,3-epoxypropyltrimethylammonium chloride etherification agent, and react for 5h;

[0038] (4) Add 3g hydrogen peroxide and react for 30min;

[0039] (5) adding glacial acetic acid to the pH value of the reaction system is 4-7;

[0040] (6) Vacuum-dry directly in a reaction vessel at a temperature of 60° C. and a vacuum degree of 0.09 MPa, pulverize and sieve to obtain the cationic starch.

Embodiment 2

[0042] A kind of preparation method of cationic starch of the present embodiment, comprises the steps:

[0043] (1) 100g tapioca starch is mixed with 250g mass percentage content of 70% ethanol aqueous solution and then placed in a reaction vessel and stirred for 30min;

[0044] (2) Add 8g of potassium hydroxide, stir and heat up to 60°C;

[0045] (3) Add 25g of 2,3-epoxypropyltrimethylammonium chloride etherification agent, and react for 4h;

[0046] (4) Add 4g hydrogen peroxide, react for 30min;

[0047] (5) adding hydrochloric acid to the pH value of the reaction system is 4-7;

[0048] (6) Vacuum dry directly in a reaction vessel at a temperature of 70° C. and a vacuum degree of 0.09 MPa, pulverize and sieve to obtain the cationic starch.

Embodiment 3

[0050] A kind of preparation method of cationic starch of the present embodiment, comprises the steps:

[0051] (1) 100g of wheat starch and 200g of 80% ethanol aqueous solution are mixed and then placed in a reaction vessel and stirred for 30 minutes;

[0052] (2) Add 10g of potassium hydroxide, stir and heat up to 65°C;

[0053] (3) Add 30g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride etherifying agent and react for 3h;

[0054] (4) Add 5g hydrogen peroxide and react for 30min;

[0055] (5) adding citric acid to the pH value of the reaction system is 4-7;

[0056] (6) Vacuum dry directly in a reaction vessel at a temperature of 75° C. and a vacuum of 0.085 MPa, pulverize and sieve to obtain the cationic starch.

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Abstract

The invention discloses a cationic starch as well as a preparation method and application of the cationic starch. The preparation method comprises the steps of (1) mixing starch and a water solution of 50-90% of organic solvent, and then, placing the mixture into a reaction vessel; (2) adding a catalyst, stirring and heating to 50-90 DEG C; (3) adding an etherifying agent, and reacting for 1-5h; (4) adding an oxidant, and reacting for 10-60 minutes; (5) adding acid until the pH value of the reaction system is up to 4-7; and (6) carrying out vacuum drying at the temperature of 50-90 DEG C and the vacuum degree of 0.07-0.1MPa to obtain the cationic starch. If the cationic starch obtained by using the preparation method disclosed by the invention is used as an AKD (Alkyl Ketene Dimer) emulsifier, the stability time of the AKD emulsifier at normal temperature can exceed three months.

Description

technical field [0001] The invention relates to the technical field of polymer compounds, in particular to a cationic starch and its preparation method and application. Background technique [0002] Native starch is a cheap, readily available, and renewable chemical raw material, but its application in industry is limited due to its insolubility in cold water, poor thermal stability of paste liquid, easy aging, and poor film-forming properties. However, by modifying native starch by appropriate physical, chemical, and enzymatic methods, its performance can be significantly improved, and various starch derivative products required by industry can be made. Among the starch derivatives, cationic starch is a very important kind of modified starch, which has a wide range of practical value. [0003] Alkyl ketene dimer (AKD) is an excellent sizing agent, insoluble in water, and the papermaking pulp system is a water dispersion system, AKD cannot be directly applied to pulp sizing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18C08B31/08D21H19/12D21H21/16
Inventor 李琳英瑜吴海龙彭渊
Owner GUANGZHOU TINCI MATERIALS TECH
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