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A kind of highly substituted cationic tapioca starch and its preparation method and application

A technology of cassava starch and high degree of substitution, which is applied in the direction of adding enhancers, can solve the problems of unsuitability for industrial production, complicated preparation process, and difficulty in popularization and use, and achieve the goals of reducing the amount of cationic starch, simplifying the preparation process, and expanding the scope of use Effect

Active Publication Date: 2017-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some preparation methods about highly substituted cationic starch, they are not suitable for industrial production due to the complexity of the preparation process and high cost. For example, CN200610166835. Synthetic method, the cationic starch prepared by this method has a high degree of substitution, but the process requires high concentration of alkali, vacuum drying, high temperature and other conditions, and the process is relatively complicated; CN201210068011.4 discloses a high degree of substitution based on alkaline ionic liquid Cationic starch synthesis method, this method realizes the green synthesis of highly substituted cationic starch, but the process requires alkaline functionalized ionic liquid, high temperature, suction filtration and other conditions, and there are many processes, it is difficult to popularize and use

Method used

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  • A kind of highly substituted cationic tapioca starch and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) pH adjustment: add 1.8g of sodium hydroxide to 30g of tapioca starch, mix evenly through a sieve, and adjust to pH=10-11;

[0032] (2) Etherification: 15g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 5g of distilled water are made into a solution and then added to the cassava starch after step (1) pH adjustment, then add 0.9g dimethyl sulfoxide, sealed and stored, and reacted at room temperature for 48 hours to obtain cationic tapioca starch with a high degree of substitution.

[0033] The highly substituted cationic tapioca starch obtained in step (2) was formulated into a solution with a concentration of 0.001g / mL and added to the paper in an amount of 0.2% relative to the dry pulp mass, and the burst index and tear resistance of the papermaking paper were measured. index, tensile index and compare with blank paper.

[0034] In this embodiment, the degree of substitution of cationic tapioca starch with a high degree of substitution is 0.334, and the ...

Embodiment 2

[0036] (1) pH adjustment: add 1.8g of sodium hydroxide to 30g of tapioca starch, mix evenly through a sieve, and adjust to pH=10-11;

[0037] (2) Etherification: 17g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 5g of distilled water are made into a solution and then added to the cassava starch after step (1) pH adjustment, then add 0.6g dimethyl sulfoxide, sealed and stored, and reacted at room temperature for 54 hours to obtain cationic tapioca starch with a high degree of substitution.

[0038] The highly substituted cationic tapioca starch obtained in step (2) is formulated into a solution with a concentration of 0.001g / mL and added to the paper in an amount of 0.4% relative to the dry pulp mass, and the burst index, tear resistance and tear resistance of the papermaking paper are measured. index, tensile index and compare with blank paper.

[0039] In this example, the degree of substitution of cationic tapioca starch with a high degree of substitution is 0.3...

Embodiment 3

[0041] (1) pH adjustment: add 1.8g of sodium hydroxide to 30g of tapioca starch, mix evenly through a sieve, and adjust to pH=10-11;

[0042] (2) Etherification: 18g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 5g of distilled water are made into a solution and then added to the cassava starch after step (1) pH adjustment, then add 0.3g dimethyl sulfoxide, sealed and stored, and reacted at room temperature for 60 hours to obtain cationic tapioca starch with a high degree of substitution.

[0043] The highly substituted cationic tapioca starch obtained in step (2) was formulated into a solution with a concentration of 0.001g / mL and added to the paper in an amount of 0.2% relative to the dry pulp mass, and the burst index and tear resistance of the papermaking paper were measured. index, tensile index and compare with blank paper.

[0044] In this example, the degree of substitution of cationic tapioca starch with a high degree of substitution is 0.307, and the pap...

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Abstract

The invention belongs to the technical field of production of modified starch, and specifically discloses cationic tapioca starch with a high degree of substitution and its preparation method and application. The preparation method is as follows: adding alkali into tapioca starch at room temperature and mixing to adjust pH; then adding a cationic etherification agent and an appropriate amount of catalyst, sealing and storing for a period of time to obtain white powder cationic tapioca starch with a high degree of substitution. The prepared cationic cassava starch with high substitution degree is formulated into a solution and added to the wet part of the paper machine in proportion to improve the physical strength of the produced paper. The invention uses cassava starch as a raw material to prepare cationic cassava starch with a high degree of substitution by a dry method, adds a catalyst to enhance the reaction effect, has a simple and controllable preparation process, is suitable for industrial production, and has high efficiency, little pollution and low cost.

Description

technical field [0001] The invention belongs to the technical field of production of modified starch, and in particular relates to cationic tapioca starch with a high degree of substitution and its preparation method and application. Background technique [0002] Among various papermaking additives, starch is the earliest and most widely used one, including native starch and modified starch, most of which are modified starches, and commonly used modified starches include cationic starch, anionic starch, nonionic starch, etc. . The performance of modified starch mainly depends on the modification method, substituent group, degree of substitution, etc. [0003] Cationic starch is a very important starch ether derivative. It is widely used in papermaking, textile, oil field development, adhesives, mining and cosmetics industries abroad. However, in China, it is only relatively mature in the papermaking industry, and other fields need to be developed. The prospects are very br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12D21H21/20
Inventor 杨仁党盛杰杨飞
Owner SOUTH CHINA UNIV OF TECH