Acetyl starch with high degree of substitution and preparation method thereof

A technology with high degree of acetylation and high substitution, applied in the field of acetylated starch and its preparation, can solve the problems of starch-based materials such as poor water resistance, complicated preparation process, and insufficient reaction, and achieve the effects of easy operation, simple preparation method, and sufficient reaction

Inactive Publication Date: 2009-02-11
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides acetyl starch with high substitution degree and its preparation method in order to solve the problems of low substitution degree of existing acetyl starch products, poor water resistance of starch-based materials, weak plasticity, complicated preparation process, high cost and insufficient reaction

Method used

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specific Embodiment approach 1

[0011] Specific implementation mode 1: In this embodiment, the high degree of substitution acetyl starch is made of starch, acetylation reagent and catalyst; the addition amount of acetylation reagent is 52.0%~60.0% of the total mass of raw materials, and the addition amount of catalyst is 10% of the total mass of raw materials. 0.2% to 1.0%, the amount of starch added is 40.0% to 47.0% of the total mass of raw materials; the acetylation reagent is acetic anhydride or acetyl chloride, and the catalyst is industrial grade concentrated sulfuric acid or industrial grade phosphoric acid.

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the starch is corn starch, potato starch or tapioca starch. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the amount of the acetylation reagent added is 55.0% to 59.0% of the total mass of raw materials. Others are the same as in the first embodiment.

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Abstract

The invention discloses an acetyl starch with high substituting degree and a preparation method thereof and relates to an acetyl starch and a preparation method thereof, which solves the problems that the existing acetyl starch has low substituting degree, and starch-based has poor water resistance and plasticity, a complex preparation technology, high cost and uncompleted reaction. The acetyl starch with high substituting degree is prepared by starch, an acetylation reagent and a catalyzer and the preparation method includes the following steps: the catalyzer is firstly added into the acetylation reagent and added into the starch with constant weight by drying; a uniform starch dispersion solution is obtained by slowly stirring, the starch dispersion solution is stirred at a medium speed on the condition of normal temperature and ultrasound. The prepared object is poured into cool water and disperses, aqueous slkali is used for adjusting to neutrality, and the product is obtained by desiccating. The acetyl starch with high substituting degree has high substituting degree, good water assistance, strong plasticity and environmental protection, and is degradable. The preparation method is simple and easy for operation, and has low cost and full reaction.

Description

technical field [0001] The invention relates to acetyl starch and a preparation method thereof. Background technique [0002] The hydrogen atom on the hydroxyl group in the starch molecule is replaced by an acetyl group, which is acetyl starch, commonly known as starch acetate. Acetyl starch is an important variety of natural starch modified products, which are widely used in food, textile, medicine, papermaking and other fields. In recent years, with the improvement of people's awareness of environmental protection, acetyl starch has been paid more and more attention by people, but the preparation of traditional acetyl starch needs to go through the process of starch activation - one method is to swell starch in water or dilute lye. Then carry out acetylation reaction, the degree of substitution of acetyl starch obtained by this method is only 0.1-1.8, the water resistance is poor and the plasticity is very poor, and the preparation process is complicated; another method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04
Inventor 赵殊兰恒宇
Owner NORTHEAST FORESTRY UNIVERSITY
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