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Preparation method of water-soluble double-bond starch ester

A water-soluble, starch ester technology, applied in the field of starch-based materials, can solve the problems of starch monomers that cannot obtain double-bond functional groups, amine residues, high solvent residues, etc., to achieve improved skin experience and high thickening Sexuality, improve the effect of using skin feeling

Inactive Publication Date: 2021-09-21
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of organic solvents (ethyl acetate, methyl acetate, butyl acetate) and catalysts (pyridine, ethylenediamine, triethylamine) used in this method are obviously faced with high solvent residues and amine odor in the subsequent treatment process. Residual problems limit its use in daily chemical or food fields
However, the above technical means all use different methods or means to react the double bond group of acrylic acid and its derivatives with the hydroxyl group on the starch molecule to obtain a starch-acrylate derivative, but this method or means In the reaction process, double bonds are required to participate, so that starch monomers with double bond functional groups cannot be obtained

Method used

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  • Preparation method of water-soluble double-bond starch ester

Examples

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Embodiment 1

[0024] The present embodiment provides a kind of preparation method of water-soluble double bond starch ester, comprises the following steps:

[0025] (1) Add 81 parts by weight of potato starch, 15 parts by weight of liquid caustic soda, 156 parts by weight of anhydrous isopropanol and 25 parts by weight of water into the reaction kettle, and stir for 60 minutes at a temperature of 35° C. to obtain a mixed solution 1;

[0026] (2) Add 36 parts by weight of glycidyl methacrylate to the mixed solution 1 obtained in step (1), stir evenly, then raise the temperature to 60° C. under stirring, and keep it warm for 3 hours to obtain the mixed solution 2;

[0027] (3) adding glacial acetic acid to the mixed solution 2 obtained in step (2), adjusting the pH=7.5 to obtain the mixed solution 3;

[0028] (4) Cool down the mixed solution 3, centrifuge and wash until no chloride ion remains in the mixed solution 3, dry and pulverize to obtain the water-soluble double-bond starch ester.

Embodiment 2

[0030] The present embodiment provides a kind of preparation method of water-soluble double bond starch ester, comprises the following steps:

[0031] (1) Add 70 parts by weight of cornstarch, 5 parts by weight of liquid caustic soda, 80 parts by weight of anhydrous isoethanol and 64 parts by weight of water into the reaction kettle, and stir for 30 minutes at a temperature of 30° C. to obtain a mixed solution 1;

[0032] (2) Add 6 parts by weight of glycidyl methacrylate to the mixed solution 1 obtained in step (1), stir evenly, then raise the temperature to 55° C. under stirring, and keep it warm for 6 hours to obtain the mixed solution 2;

[0033] (3) adding glacial acetic acid to the mixed solution 2 obtained in step (2), adjusting the pH=6 to obtain the mixed solution 3;

[0034] (4) Cool down the mixed solution 3, centrifuge and wash until no chloride ion remains in the mixed solution 3, dry and pulverize to obtain the water-soluble double-bond starch ester.

Embodiment 3

[0036] The present embodiment provides a kind of preparation method of water-soluble double bond starch ester, comprises the following steps:

[0037] (1) Add 90 parts by weight of refined potato starch, 20 parts by weight of liquid caustic soda, 260 parts by weight of anhydrous methanol and 20 parts by weight of water into the reaction kettle, and stir at a temperature of 38°C for 45 minutes to obtain a mixed solution 1;

[0038] (2) Add 80 parts by weight of glycidyl methacrylate to the mixed solution 1 obtained in step (1), stir evenly, then raise the temperature to 65° C. under stirring, and keep it warm for 4 hours to obtain the mixed solution 2;

[0039] (3) adding glacial acetic acid to the mixed solution 2 obtained in step (2), adjusting the pH=9 to obtain the mixed solution 3;

[0040] (4) Cool down the mixed solution 3, centrifuge and wash until no chloride ion remains in the mixed solution 3, dry and pulverize to obtain the water-soluble double-bond starch ester.

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Abstract

The invention discloses a preparation method of water-soluble double-bond starch ester, and belongs to the technical field of starch-based materials. The method comprises the following steps: (1) adding starch, caustic soda liquid and a solvent into a reaction kettle, and stirring for 30-60 minutes at the temperature lower than 40 DEG C to obtain a mixed solution 1; (2) adding an etherifying agent into the mixed solution 1 obtained in the step (1), uniformly stirring, heating to 55-70 DEG C in a stirring state, and keeping the temperature for 3-6 hours to obtain a mixed solution 2; (3) adding glacial acetic acid into the mixed solution 2 obtained in the step (2), and adjusting the pH value to be 6-9 to obtain a mixed solution 3; and (4) cooling the mixed solution 3, centrifugally washing until no chloride ion residue exists in the mixed solution 3, drying and crushing to obtain the water-soluble double-bond starch ester. The water-soluble double-bond starch ester is applied to a traditional carbomer product, the use skin feeling of the viscosity of the carbomer product can be improved, and unification of the carbomer product in the aspects of high transparency, high thickening performance and high skin feeling performance is achieved.

Description

technical field [0001] The invention relates to a preparation method of water-soluble double-bond starch ester, belonging to the technical field of starch-based materials. Background technique [0002] As the concept of environmental protection continues to be deeply rooted in the hearts of the people, biodegradable materials have begun to return to people's vision and attract attention. In October 2019, my country's National Development and Reform Commission announced a roadmap for the gradual withdrawal of plastic microbeads from the domestic market. This makes natural and its modified materials have a broader application prospect. In the field of daily chemicals, starch is often used as a thickener for high-end cosmetics due to its high viscosity in aqueous solution and good skin experience, but its insolubility in cold water and poor transparency of the solution are often used It is replaced by carbomer with excellent transparency and obvious thickening effect. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12
CPCC08B31/12
Inventor 李养令黄志鹏刘冰心王建太黎宇芯李峥嵘黄钢
Owner WUYI UNIV