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Preparation method of polyacrylic acid thickener taking modified starch as cross-linking agent

A technology of polyacrylic acid and cross-linking agent, applied in the field of new materials, can solve the problems of high structural viscosity, difficult to remove paste with water, poor water retention, etc., and achieve the effect of improving electrolyte resistance and excellent thickening ability.

Active Publication Date: 2020-07-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also defects such as high structural viscosity, poor fluidity, poor water holding capacity, difficulty in water washing and paste removal, and hard hand feeling of the fabric.
The original starch is moderately hydrolyzed by acid, heat or other effects, some glycoside bonds are broken, the chain length is shortened, and the printability is improved, but it still cannot meet the requirements of modern printing technology.
At present, after modifying the cheap starch, it is used as a polyacrylic acid thickener crosslinking agent, and so far there are few reports

Method used

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  • Preparation method of polyacrylic acid thickener taking modified starch as cross-linking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add soluble starch into a three-necked flask equipped with a stirrer and a reflux condenser, add a 50% NaOH aqueous solution under stirring conditions, and the ratio of its mass to the mass of soluble starch is 1:1 to completely dissolve the starch; Under the condition of 70°C and stirring, slowly add freshly steamed 3-bromo-1-propene dropwise from the dropping funnel, the ratio of its mass to the mass of soluble starch is 1:1, after the addition, heat up to 80°C, and stir Under the conditions of reaction for 4 hours, after the reaction was completed, cooled, added the same volume of deionized water, washed away sodium bromide, and separated the organic layer; the organic layer was washed twice with water, steam distilled until no volatiles were distilled, then added toluene, separated liquid to obtain a light yellow solution; dry with fresh anhydrous sodium sulfate, filter, and the filtrate is at 100 ° C, N 2 Under protection, vacuum distillation, completely remove...

Embodiment 2

[0040] (1) Add soluble starch into a three-necked flask equipped with a stirrer and a reflux condenser, add a 50% NaOH aqueous solution under stirring conditions, and the ratio of its mass to the mass of soluble starch is 2:1 to completely dissolve the starch; Under the condition of stirring at 75°C, slowly add freshly steamed 3-bromo-1-propene dropwise from the dropping funnel, the ratio of its mass to the mass of soluble starch is 2:1, after the addition, heat up to 85°C, and stir Under the condition of reaction for 2h, after the reaction was finished, cool down, add the same volume of deionized water, wash away the sodium bromide, separate the organic layer; wash the organic layer twice, steam distill until no volatile matter distilled, add toluene, separate liquid to obtain a light yellow solution; dry with fresh anhydrous sodium sulfate, filter, and the filtrate is at 100 ° C, N 2 Under protection, vacuum distillation, completely remove toluene, much allyl starch;

[004...

Embodiment 3

[0044] (1) Add soluble starch into a three-necked flask equipped with a stirrer and a reflux condenser, add a 50% NaOH aqueous solution under stirring conditions, and the ratio of its mass to the mass of soluble starch is 1.5:1 to completely dissolve the starch; Under the condition of stirring at 72°C, slowly add freshly steamed 3-bromo-1-propene dropwise from the dropping funnel, the ratio of its mass to the mass of soluble starch is 1.5:1, after the addition, heat up to 82°C, and stir Under the condition of reaction for 3h, after the reaction was finished, cool down, add the same volume of deionized water, wash away the sodium bromide, separate the organic layer; wash the organic layer twice, steam distill until no volatile matter distilled, add toluene, separate liquid to obtain a light yellow solution; dry with fresh anhydrous sodium sulfate, filter, and the filtrate is at 100 ° C, N 2 Under protection, vacuum distillation, completely remove toluene, much allyl starch;

...

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Abstract

The invention discloses a preparation method of a polyacrylic acid thickener taking modified starch as a cross-linking agent. The polyacrylic acid thickener with excellent thickening performance and good electrolyte resistance is prepared by taking 3-bromo-1-propylene modified soluble starch as a cross-linking agent and introducing a hydrophobic monomer docosyl polyoxyethylene ether methacrylate,a functional monomer 10-(2-methacryloyloxy) monodecyl phosphate and an acrylic monomer for copolymerization.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method of a polyacrylic acid thickener using modified starch as a crosslinking agent. Background technique [0002] Polyacrylic acid thickeners have the characteristics of non-toxicity, environmental friendliness, and good biocompatibility, and are widely used in the fields of biomedicine, daily chemical industry, textile printing and dyeing, etc. Slightly cross-linked polyacrylic acid thickener can connect different long chains to make the system form a three-dimensional network structure. When it swells with water, the relative movement is restricted due to the cross-linking effect between the chains, and the water molecules are firmly bound due to the attractive force of the hydrophilic group and the binding effect of the spatial grid, thereby increasing the swelling rate. Various properties of the thickener. Commonly used crosslinking agents are N,N'-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/08C08F291/06C08F230/02C08F220/06C08F2/32C08B31/00
CPCC08F251/00C08F283/065C08F2/32C08B31/00
Inventor 彭勇刚汪媛黎珊陶永新纪俊玲
Owner CHANGZHOU UNIV
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