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Preparation method of starch water-retaining agent with high gel strength

A high-gel, water-retaining agent technology, applied in the field of starch-based water-retaining agent preparation, can solve the problems of poor starch-based water-retaining agent retention, large liquid penetration, easy breakage or deformation, etc. The effect of high adhesive strength and high water absorption rate

Inactive Publication Date: 2015-06-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the relatively low gel strength of starch-based water-retaining agents, starch-based water-retaining agents are easily broken or deformed after absorbing water, and lead to poor liquid retention characteristics and large liquid penetration, which greatly limits its use. scope of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0021] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;

[0022] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in an ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.015g Add N,N'-methylenebisacrylamide and 0.035g ammonium persulfate together with sodium acrylate solution to gelatinized wheat starch to obtain a mixed solution; the mass ratio of maleic acid to acrylic acid is 1:2;

[0023] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;

[0024] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluoroethylene plat...

Embodiment 2

[0027] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0028] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;

[0029] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in an ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.030g N,N'-methylenebisacrylamide and 0.035g ammonium persulfate were added to the gelatinized wheat starch together with sodium acrylate solution to obtain a mixed solution; the mass ratio of maleic acid to acrylic acid was 1: 2;

[0030] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;

[0031] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluor...

Embodiment 3

[0034] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0035] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;

[0036] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in an ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.045g N, N'-methylenebisacrylamide and 0.035g ammonium persulfate are added in the gelatinized wheat starch together with sodium acrylate solution to obtain a mixed solution; the mass ratio of maleic acid to the acrylic acid is 1:2;

[0037] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;

[0038] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetraflu...

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Abstract

The invention discloses a preparation method of a starch water-retaining agent with high gel strength. The preparation method is characterized by comprising the following steps of pasting wheat starch, preparing a sodium acrylate solution under an ice bath condition, simultaneously adding cis-butenedioic acid, N, N'-methylenebisacrylamide, ammonium persulfate and the sodium acrylate solution into the pasted wheat starch to obtain a mixed solution, stirring the mixed solution, and carrying out graft copolymerization on the mixed solution to form a copolymerized product, wherein cis-butenedioic acid can also be replaced with kaolin or diatomite; and pouring the copolymerized product into a tetrafluoroethylene plate to carry out drying treatment to obtain the starch water-retaining agent with high gel strength. According to the preparation method, the starch water-retaining agent is prepared from cis-butenedioic acid or kaolin or diatomite serving as a raw material, so that the prepared starch water-retaining agent is high in gel strength, strong in biodegradability, high in water absorption rate and strong in salt tolerance, and the preparation method is simple and free of pollution and can be used for industrial production.

Description

[0001] This application is a divisional application of an invention patent application with the application number 2013102913113, the application date is 2013.07.11, and the invention title is "a method for preparing a starch-based water-retaining agent with high gel strength". technical field [0002] The invention relates to a preparation method of a starch-based water-retaining agent. Background technique [0003] Water-retaining agent is a special functional polymer with a unique three-dimensional network structure, which can absorb water dozens or even thousands of times its own weight and is not easy to lose, which makes it widely used in sanitary products, agriculture, forestry and gardening, and daily use. It is widely used in chemical industry, food industry, construction industry, medical textile and other fields. Physiological and hygienic products are the earliest and largest application fields of water-retaining agents; in textiles, water-retaining agents can be...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F222/02C08F222/38C08K3/34
Inventor 郑志赵妍嫣卢从从
Owner HEFEI UNIV OF TECH
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