Amphiprotic starch graft copolymer and its one-step preparing process

A technology of graft copolymer and amphoteric starch, applied in the field of chemistry, can solve the problems that industrial production and application cannot be promoted, the product quality is unstable, the preparation process is complicated, etc., and achieves excellent application performance, convenient industrial production and application, Equipment requires simple effects

Inactive Publication Date: 2003-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the current preparation of amphoteric starch is produced by a step-by-step method, the preparation process is complicated, the production cycle is long, the equipment requirements are high, the preparation cost is high, and the product quality is unstable. The preparation of graft copolymer products is greatly restricted, resulting in the inability to promote the industrial production and application of this product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a super constant temperature water bath reactor or other constant temperature reactor with a constant temperature of 20°C, keep stirring continuously, and prepare 30% starch milk with the water-alcohol mixed medium with a volume ratio of 0.6, and add the dry weight of starch 5.8% of 3-chloro-2-hydroxypropyl trimethylamine hydrochloride and 3.5% strong alkali solution on dry basis of starch, activated for 10min, adding 5.5% sodium tripolyphosphate dilute alkali solution on dry basis of starch , Reaction 3h. Neutralize to neutral after the reaction, filter, prepare amphoteric starch with deionized water to make 4% starch milk, heat up to 90°C for gelatinization for 40min, cool to 40°C, adjust the pH value to 5 with nitric acid, pass through After 30 minutes of nitrogen or carbon dioxide, add a cerium salt initiator with a system concentration of 2.5mmol / L, induce for 10 minutes, add 100% of the mass of starch acrylamide amine, react for 3 hours, neutralize to neutral, ...

Embodiment 2

[0022] In a super constant temperature water bath reactor or other constant temperature reactor with a constant temperature of 40°C, keep stirring continuously, and make 40% starch milk from the raw corn starch with a water-alcohol mixed medium with a volume ratio of 1.0, and add and starch dry basis 3.5% strong alkali solution by mass, activated for 10min, add 10% 3-chloro-2-hydroxypropyl trimethylamine hydrochloride and 2.5% sodium tripolyphosphate dilute alkali Solution, reaction 1h. After the reaction, it is neutralized to neutral, filtered, and the prepared amphoteric starch is made into 8% starch milk with deionized water, heated to 70°C for gelatinization for 20 minutes, cooled to 50°C, adjusted to pH 3 with nitric acid, and passed through After 10 minutes of nitrogen or carbon dioxide, add a cerium salt initiator with a system concentration of 4.0mmol / L, induce for 30 minutes, add 20% of the mass of starch acrylamide amine, react for 4 hours, neutralize to neutral, add...

Embodiment 3

[0024] In a super constant temperature water bath reactor or other constant temperature reactor with a constant temperature of 50°C, keep stirring continuously, make 5% starch milk with the water-alcohol mixed medium with a volume ratio of 1.2, and add the starch dry weight 20% of 3-chloro-2-hydroxypropyl trimethylamine hydrochloride and 7% strong alkali solution of dry weight of starch, activated for 5min, adding 20% ​​of sodium tripolyphosphate dilute alkali solution of dry weight of starch , Reaction 4h. Neutralize to neutral after reaction, filter, prepare amphoteric starch with deionized water to make 4% starch milk, heat up to 90°C for gelatinization for 20 minutes, cool to 20°C, adjust pH value to 5 with nitric acid, pass through After 30 minutes of nitrogen or carbon dioxide, add cerium salt initiator with a system concentration of 2.0mmol / L and 4.0mmol / L potassium persulfate, induce for 10 minutes, add acrylamide amine of 200% of the starch mass, react for 3 hours, an...

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Abstract

A process for preparing the graft copolymer of amphiprotic starch prepared by one-step method includes such steps as preparing amphiprotic starch by both cationic and anionic reaction at 20-60 deg.C, where mixed water-alcohol solvent is used as reaction medium, tripolyphosphate or pyrophosphate as anionic reagent and 3-Cl-dihydroxytrimethylamine hydrochloride as cationic reagent, the graft copolymerizing between amphiprotic starch and acrylamide at 5-60 deg.C in water phase, and cationic reacting for the graft chain of said graft copolymer at 2-50 deg.C in water phase. Its advantages are better network structure, and high stability.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to preparing a starch product with both functional structure and network structure on the starch chain skeleton and grafted chain skeleton. This technology is used in modified starch production enterprises, and the resulting amphoteric starch graft copolymer products can be used in a wide range of industries and fields such as papermaking, textiles, chemicals, pharmaceuticals, petroleum, environmental protection, agriculture and mining. Background technique [0002] Starch is a natural polymer compound, synthesized by plants through photosynthesis, and its basic component is carbohydrates. Starch products mainly refer to naturally occurring raw starch and denatured starches that have been modified by various physical, chemical and biological methods. starch. Amphoteric starch and starch graft copolymer are two major types of modified starch products. [0003] At present, the amphoteric st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00
Inventor 张本山张友全杨连生李国基耿予欢高文宏
Owner SOUTH CHINA UNIV OF TECH
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