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Method for producing starch based amphiprotic absorbent resin with semi-interpenetrating network configuration

A technology of super absorbent resin and network structure, applied in the field of natural polymers and functional polymers, can solve the problems of low water absorption and low salt resistance, and achieve the effect of improving salt resistance, low price and wide source.

Inactive Publication Date: 2008-06-11
URUMCHI DEMEILONG PLASTIC CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been seen that native starch is used as a linear polymer, and the cross-linked network obtained by copolymerization with acrylic acid and acrylamide forms an anionic gel with a semi-interpenetrating structure, but the water absorption rate is low. Other similar reports are also anionic, and the salt tolerance is not good. protrude

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 1 g of starch sulfate (degree of substitution 0.65) in 15 ml of water. In addition, neutralize 10g of acrylic acid with 30wt% sodium hydroxide solution under the condition of ice-water bath until the neutralization degree is 65mol%, add it to the starch sulfate solution, stir under the protection of nitrogen until the monomers are evenly mixed, then heat up to 60°C , add dropwise 4g composite dispersant Span 60: Tween 80=2:1 (w / w), inert solvent cyclohexane 50ml, 1mg N, N'-methylenebisacrylamide, 0.25g ammonium persulfate and 10 g of a solution of 18 wt % polyacryloyloxyethyltrimethylammonium chloride. After reacting for 3 hours, the product was washed with methanol and water respectively to remove inert solvent, dispersant, homopolymer and unreacted monomer, and dried at 80°C. The water absorption rate of the product in deionized water (hereinafter referred to as water absorption rate) is 1023g / g. The water absorption in 0.9% NaCl solution (hereinafter refer...

Embodiment 2

[0018] Same as Example 1, the crosslinking agent dosage is 6mg. The water absorption rate of the product is 843g / g. The salt water absorption rate is 78g / g.

Embodiment 3

[0020] Same as Example 1, when the amount of acrylic acid is 20g, the amount of crosslinking agent is 2mg. The water absorption rate of the product is 1936g / g, and the salt water absorption rate is 98g / g.

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PUM

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Abstract

The invention discloses a preparation method of starch-based amphiprotic super absorbent resin with semi-interpenetrating network structure, which uses starch material and hydrophilic vinyl unsaturated monomer, in the presence of cross linker and initiator, via crosslinking, grafting and copolymerization to form a network polymer, to be interpenetrated with linear polycation in the solution to obtain the starch-based amphiprotic super absorbent resin with semi-interpenetrating network structure. The inventive product has good liquid absorbability, salt tolerance and strength, with simple and easy production, which can be used as water absorbent of biological degradation and used in agriculture and sanitary fields.

Description

technical field [0001] The invention relates to a method for preparing a starch-based amphoteric superabsorbent resin with a semi-interpenetrating network structure. It is formed by cross-linking and branching copolymerization of starch raw materials and hydrophilic ethylenically unsaturated monomers to form a network polymer. A functional material made by interpenetrating with linear polycations. It belongs to the field of functional polymers and also belongs to the field of natural polymers. Background technique [0002] Super Absorbent Resin (SAR) is a new functional polymer material developed over the past 30 years. It refers to a polymer that can absorb and retain hundreds or even thousands of times its own weight in water. Absorbent. [0003] Compared with ordinary water-absorbing or hygroscopic materials, such as absorbent cotton, sponge, agar, silica gel, etc., super absorbent resin has the characteristics of high water absorption and high water retention, and can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00
Inventor 徐世美王吉德彭贵李欣陈效珍
Owner URUMCHI DEMEILONG PLASTIC CHEM
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