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Synthesis of soluble amphoteric starch

A technology of amphoteric starch and synthesis method, which is applied in the field of synthesis of water-soluble amphoteric starch, can solve the problems of serious environmental pollution, complex preparation process, harsh reaction conditions, etc., and achieve high purity, reduce environmental pollution, and mild reaction conditions.

Inactive Publication Date: 2007-04-04
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that anion and cation groups can be connected to the same active site of the starch molecule, but there are problems such as serious corrosion and serious environmental pollution.
[0006] As mentioned above, in the previous method of synthesizing amphoteric starch, there were complex preparation process, long production cycle, high cost and harsh reaction conditions.

Method used

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  • Synthesis of soluble amphoteric starch
  • Synthesis of soluble amphoteric starch
  • Synthesis of soluble amphoteric starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 1000g of starch and 50g of powdery sodium hydroxide into a special reaction kettle and stir thoroughly for 10min, spray into 200ml of 20% isopropanol, and fully stir for 30min at a temperature of 50°C. Then 500g of N-(2,3-epoxypropyl)trimethylammonium chloride (GTA) was added, and after stirring at this temperature for 30min, the temperature was raised to 80°C for 3h. Cool down to 35°C, add 50ml of carbon disulfide and 25g of magnesium oxide, seal and react at 35°C for 30 minutes, and pulverize to obtain fine powder cationic starch sulfonate.

Embodiment 2

[0023] 1000g of starch and 50g of powdered sodium hydroxide were fully stirred in a special reaction kettle for 10min, then sprayed into 100ml of N,N-dimethylformamide, heated to 50°C and stirred for 30min. Then successively spray 150ml sodium chloroacetate solution (50g chloroacetic acid dissolved in 40% sodium hydroxide aqueous solution), 200mL quaternary ammonium salt solution (600g 3-chloro-2-hydroxypropyltrimethyl ammonium chloride dissolved in 10% carbonic acid sodium aqueous solution), fully stirred for 30 minutes, heated to 80°C for 3 hours, and pulverized to obtain white fine powder carboxymethyl cationic starch.

Embodiment 3

[0025]Add 1000g of starch and 350mL of quaternary ammonium salt solution (530g of 3-chloro-2-hydroxypropyltrimethylammonium chloride dissolved in 40% sodium hydroxide aqueous solution) and 30ml of fatty alcohol polyoxygen into a special reaction kettle Vinyl ether, stir well for 15 minutes, then raise the temperature to 50°C and stir for 30 minutes, then raise the temperature to 80°C for 3 hours, add 40g of succinic anhydride and 25g of calcium oxide, stir and mix evenly, raise the temperature to 130°C for 1 hour, and pulverize to obtain a fine powder Cationic starch succinate.

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Abstract

Synthesis of amphoteric soluble starch is carried out by taking starch as raw material, taking any kind from sodium chloroacetate, butanedioic anhydride and 3-chlorine-2-cysteic acid as anion reagent, taking any kind from 3-chlorine-2-hydroxypropyl trimethyl-ammonia chloride and N-(2,3-epoxide)trimethyl-ammonia chloride as cation reagent, catalyzing by composite catalyst, synthesizing the final product at 30-150 degree for 1-8hrs by semi-drying method. It' simple, cheap and efficient, has no after-treatment and waste ejection.

Description

technical field [0001] The invention relates to a method for synthesizing water-soluble amphoteric starch. Specifically, it relates to a method for modifying starch with anionizing reagents and cationic reagents to synthesize water-soluble amphoteric starch through a semi-dry synthesis process under the catalysis of a composite catalyst. Background technique [0002] Amphoteric starch refers to a modified starch in which both cationic and anionic groups are attached to the same starch molecule. Amphoteric starch is a new type of modified starch developed in recent years. The modification technology of anion and cationic starch is comprehensively applied to make its application effect more prominent. The nature of amphoteric starch varies with the manufacturing process formula, and the purpose and effect of application are also quite different, but in terms of its commonality, the starch molecular chains of amphoteric starch contain both positive and negative charge groups. ...

Claims

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Application Information

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IPC IPC(8): C08B31/00
Inventor 王公应陈彦逍刘绍英王越曾毅
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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