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

A high-gel and water-retaining agent technology, which is applied in the field of preparation of starch-based water-retaining agents, can solve the problems of starch-based water-retaining agents such as poor retention characteristics, large liquid penetration, and limited use range, etc., to achieve strong salt resistance and gel The effect of high strength and simple preparation method

Inactive Publication Date: 2015-05-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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

[0019] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0020] 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;

[0021] 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;

[0022] 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;

[0023] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluoroethylene plate...

Embodiment 2

[0026] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0027] 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;

[0028] 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 Add N,N-methylenebisacrylamide and 0.035g ammonium persulfate together with sodium acrylate solution to the gelatinized wheat starch to obtain a mixed solution; the mass ratio of maleic acid to acrylic acid is 1:2 ;

[0029] 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;

[0030] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluoroethylene...

Embodiment 3

[0033] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:

[0034] 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;

[0035] 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;

[0036] 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;

[0037] 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 gelatinizing wheat starch, preparing a sodium acrylate solution under an ice bath condition, adding maleic acid, N,N-methylene bisacrylamide, ammonium persulfate and a sodium acrylate solution into the gelatinized wheat starch to obtain a mixed solution, stirring the mixed solution for graft copolymerization to form a copolymerization product, pouring the copolymerization product into a tetrafluoroethylene board for drying treatment, and obtaining the starch water-retaining agent with the high gel strength, wherein maleic acid can be changed to kaoline or kieselguhr. According to the method, maleic acid, kaoline or kieselguhr serves as a raw material to prepare the starch water-retaining agent, so that the prepared starch water-retaining agent is high in gel strength, biodegradability, water absorption velocity and salt tolerance, and the preparation method is simple and non-pollution and can be used for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a starch-based water-retaining agent. Background technique [0002] 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 used to make anti-sweat shirts, anti-sweat insoles, etc.; It can also be used as a concrete additive; in agriculture and forestry, the water-retaining agent can be used as a soil improver and water-retaining agent, especially in arid areas, it can effectively improve the soil st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F222/02C08F222/38C08K3/34
Inventor 赵妍嫣卢从从郑志
Owner HEFEI UNIV OF TECH
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