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Method for preparing super high water uptake resin of copolymerization of acrylic ester grafted from sodium alginate

A technology of acrylate and sodium alginate, which is applied in the field of graft copolymerization to prepare water-absorbent resins, can solve the problems of troublesome post-processing, explosive polymerization discharge, and difficult loss of reaction heat, etc., and achieves fast water absorption rate and uniform particle size distribution , good biocompatibility

Inactive Publication Date: 2005-01-12
EAST CHINA UNIV OF TECH
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For the solution polymerization method, there are disadvantages such as difficult loss of reaction heat, easy explosion polymerization and difficult discharge; emulsion polymerization requires a series of processes such as demulsification and washing, and post-processing is troublesome, and it is not an ideal polymerization method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 2-liter reaction kettle, add 2% sodium alginate aqueous solution 300mL, 5% hydroxyethyl acrylate aqueous solution 60mL, cyclohexane 300mL, stir vigorously, gradually raise the temperature to 50°C, and drop 5% 10 mL of ethylene glycol solution and 10 mL of 1% ammonium persulfate solution. After the dropwise addition, the reaction was continued for 2 hours, and the polymer was precipitated with a large amount of methanol, washed and dried in vacuum. The obtained polymer is in milky white granular shape, with an average particle diameter of 70 μm, a water absorption capacity of 1100 g / g, and a 0.9% sodium chloride aqueous solution absorption rate of 100 g / g.

Embodiment 2

[0019] According to the polymerization method of Example 1, except that the amount of cyclohexane was 350 mL, the water absorption capacity of the obtained water-absorbent resin was 1150 g / g, and the absorption rate of 0.9% sodium chloride aqueous solution was 110 g / g.

Embodiment 3

[0021] According to the polymerization method of Example 1, except that the dropwise amount of 1% ammonium persulfate solution was 15 mL, the water absorption capacity of the obtained water-absorbent resin was 950 g / g, and the absorption rate of 0.9% sodium chloride aqueous solution was 80 g / g.

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Abstract

The invention relates to a method for preparing super high water-absorbing resin by resin sodium alginate and hydroxyl acrylate through the process of copolymerization reaction. Said method includes the following steps: firstly, mixing sodium alginate aqueous solution and hydroxyl acrylate aqueous solution according to a certain ratio, then adding quantitative dispersing agent, fully mixing them uniformly, strong stirring them and drop-adding a certain quantity of initiator and cross-linking agent, reactng for several hours, then precipitating and washing so as to obtain the granular resin. Said method is easy to implement, the obtained resin has good biological compatibility, strong water retentivity and absorbability and good salt resistance.

Description

technical field [0001] The invention relates to a method for preparing water-absorbing resin by grafting and copolymerizing sodium alginate and hydroxyacrylate as raw materials. Background technique [0002] Superabsorbent resin is a new type of functional polymer material. Because of its ultra-high water absorption and good water retention performance, it has a wide range of uses in industry, agriculture, and medical care, and has great development value. It can also be blended with other polymer materials to produce composite materials with excellent performance. [0003] Currently; methods for synthesizing superabsorbent resins include solution polymerization, emulsion polymerization, and inverse suspension polymerization. For the solution polymerization method, there are disadvantages such as difficult loss of reaction heat, easy explosion polymerization and difficult discharge; emulsion polymerization requires a series of processes such as demulsification and washing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00
Inventor 刘云海曹小红马建国彭道锋许文苑刘淑娟
Owner EAST CHINA UNIV OF TECH
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