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Polyaspartic acid water-absorbing resin and preparation method thereof

A technology of polyaspartic acid and polyaspartic acid, which is applied in the field of polyaspartic acid water-absorbing resin and its preparation, and can solve problems such as relatively expensive costs

Active Publication Date: 2013-06-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN1730105A discloses a method for preparing a superabsorbent by using polyglutamic acid synthesized by microbial fermentation. Polyglutamic acid is produced by fermentation, and the cost of separation and purification is relatively expensive.

Method used

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  • Polyaspartic acid water-absorbing resin and preparation method thereof
  • Polyaspartic acid water-absorbing resin and preparation method thereof
  • Polyaspartic acid water-absorbing resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In a reactor with a stirring device, polyaspartic acid with a weight average molecular weight of 90,000 Da (Dalton) and polyaspartic acid with a weight average molecular weight of The aspartic acid derivative PAHy is mixed in deionized water until the total molar concentration of the reactant raw material polyaspartic acid and PAHy in water is 2mol / L. After fully stirring, the pH of the reaction system is adjusted to 3 with phosphoric acid. Then, according to the total molar ratio of polyaspartic acid and polyaspartic acid derivatives to glutaraldehyde of 10:1, glutaraldehyde was added therein as a crosslinking agent to carry out crosslinking reaction at 80°C. After the reaction is completed, the prepared product is washed with deionized water to neutrality, and then placed in an oven at 40° C. and dried to constant weight to obtain a dry polyaspartic acid water-absorbent resin. The water absorption rate of polyaspartic acid water-absorbent resin in 0.9 wt% NaCl aqueous...

Embodiment 2

[0078] The difference between Example 2 and Example 1 is that the molar ratio of polyaspartic acid to PAHy is 1:12, and phosphoric acid is used to adjust the pH of the reaction system to 4. The rest of the conditions are the same as in Example 1, and the water absorption rate of the polyaspartic acid water-absorbent resin in 0.9 wt% NaCl aqueous solution is measured to be 32 times by the same method as in Example 1.

Embodiment 3

[0080] The difference between Example 3 and Example 1 is that the polyaspartic acid derivative is PHEA, and the weight average molecular weight of PHEA is 55,000 Da, the molar ratio of polyaspartic acid and PHEA is 1:10, and phosphoric acid is used to adjust the reaction The pH of the system was brought to 4. The rest of the conditions are the same as in Example 1, and the water absorption rate of the polyaspartic acid-based water-absorbing resin in 0.9 wt% NaCl aqueous solution is measured to be 35.5 times by the same method as in Example 1.

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Abstract

The invention relates to a preparation method of a polyaspartic acid water-absorbing resin. The method uses an epoxy substance as a crosslinking agent to carry out crosslinking reaction on polyaspartic acid and polyaspartic acid derivatives. The prepared polyaspartic acid water-absorbing resin has high water absorptivity; and after the water-absorbing resin absorbs water, the strength is obviously superior to that of the polyaspartic acid water-absorbing resin produced in the prior art, and the water absorptivity in normal saline (0.9% NaCl solution) can reach 145 times, and is much higher than that of the polyaspartic acid water-absorbing resin produced in the prior art. The method is simple to operate, does not need any organic solvent in the reaction process, has the advantages of low consumption of solvent water and low cost, can not bring about environmental pollution, can easily implement industrial production, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of polymer water-absorbing resin preparation, and relates to a polyaspartic acid-based water-absorbing resin prepared from polyaspartic acid and polyaspartic acid derivatives as raw materials and a preparation method thereof. Background technique [0002] Super-absorbent water-absorbent resin is a polymer that can absorb water tens to thousands of times its own weight. It is a water-soluble polymer that is cross-linked by a cross-linking agent to form a spatial network structure that can absorb a large amount of water and swell. The traditional super-absorbent resin polyacrylate water-absorbent resin is cheap, but it is a non-renewable resource, and it degrades slowly. After degradation, it has a relatively large negative impact on the environment and human beings. Polyaspartic acid water-absorbing resin is formed by aspartic acid polymerization to form polysuccinimide, then hydrolyzed and cross-linked. It n...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08J3/24C08G73/10
Inventor 谭天伟孟宏宇曹辉魏军刘敏董安王扬陈秋池王丽琳侯鉴旋
Owner BEIJING UNIV OF CHEM TECH