Preparation method of crylic acid resin with high water absorbability

A technology of super absorbent resin and water absorbent resin, which is applied in absorbent pads, coatings, medical science and other directions, can solve the problems of prolonged production cycle, increased production cost, intolerant storage of acrylic acid, etc., and achieves quality improvement, quality improvement, color improvement white effect

Active Publication Date: 2012-06-27
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned treatment method can improve the performance of the water-absorbent resin, it also cause

Method used

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  • Preparation method of crylic acid resin with high water absorbability

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Effect test

Embodiment 1

[0031]a) Add 2700g of high-purity acrylic acid and 800g of deionized water into a 10L reactor with a stirrer and a jacket cooling device, and then slowly add 3100g of 32wt% sodium hydroxide solution to the reaction under stirring and cooling conditions kettle for neutralization reaction.

[0032] b) The above sodium acrylate aqueous solution was fed into a jacketed double-arm kneader with a volume of 10 L and two sigma blades, and the air in the system was replaced with nitrogen while keeping the reaction liquid at 30°C. Then, while stirring the reaction solution, 1.08 g of N,N-methylenebisacrylamide, 8.1 g of ammonium persulfate, 8.1 g of sodium bisulfite and 0.015 g of ferrous chloride were added. Polymerization started quickly and the resulting hydrogel polymer was removed after 30 minutes. The hydrogel polymer has been divided into small pieces with a diameter of 20mm-100mm, and a small part of the colloid is agglomerated.

[0033] c) The above-mentioned granules are add...

Embodiment 2

[0037] a) Add 2700g of high-purity acrylic acid and 800g of deionized water into a 10L reactor with a stirrer and a jacket cooling device, and then slowly add 3100g of 32wt% sodium hydroxide solution to the reaction under stirring and cooling conditions kettle for neutralization reaction.

[0038] b) The above sodium acrylate aqueous solution was fed into a jacketed double-arm kneader with a volume of 10 L and two sigma blades, and the air in the system was replaced with nitrogen while keeping the reaction liquid at 30°C. Then, while stirring the reaction solution, 1.08 g of N,N-methylenebisacrylamide, 8.1 g of ammonium persulfate, 8.1 g of sodium bisulfite and 0.74 g of ferrous chloride were added. Polymerization started quickly and the resulting hydrogel polymer was removed after 30 minutes. The hydrogel polymer has been divided into small pieces with a diameter of 20mm-100mm, and a small part of the colloid is agglomerated.

[0039] c) Add the above-mentioned granules int...

Embodiment 3

[0043] a) Add 2700g of high-purity acrylic acid and 800g of deionized water into a 10L reactor with a stirrer and a jacket cooling device, and then slowly add 3100g of 32wt% sodium hydroxide solution to the reaction under stirring and cooling conditions kettle for neutralization reaction.

[0044] b) The above sodium acrylate aqueous solution was fed into a jacketed double-arm kneader with a volume of 10 L and two sigma blades, and the air in the system was replaced with nitrogen while keeping the reaction liquid at 30°C. Then, while stirring the reaction liquid, 1.08 g of N,N-methylenebisacrylamide, 8.1 g of ammonium persulfate, 8.1 g of sodium bisulfite and 0.15 g of ferrous chloride were added. Polymerization started quickly and the resulting hydrogel polymer was removed after 30 minutes. The hydrogel polymer has been divided into small pieces with a diameter of 20mm-100mm, and a small part of the colloid is agglomerated.

[0045] c) Add the above-mentioned granules into ...

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Abstract

The invention discloses a preparation method of crylic acid resin with high water absorbability. The preparation method comprises the following steps: adding variant valence metal low valence ion with molar weight of 2-100 ppm relative to an acrylic monomer into initiator in an acrylic acid polymerization process, and taking the variant valence metal low valence ion as assistant reducing agent, so that the content of low polymer in the product can be effectively reduced; and spraying emulsion formed by reducing agent aqueous solution, hydrophobic solvent and surface active agent in a granulation process of prepared resin colloid with water absorbability, and taking the emulsion as dispersing agent, so that the functions of dispersing colloidal particles, increasing whiteness and reducing residual monomers are realized. The method is easy to realize, the imbibition capacity of the resin with water absorbability can be effectively improved, and the color of the resin with water absorbability is improved.

Description

technical field [0001] The invention relates to a preparation method of a hygienic acrylic superabsorbent resin, in particular to a preparation method of a superabsorbent resin with relatively low residual monomer content and white color. The water-absorbent resin prepared by the method of the invention can be used in sanitary products such as paper diapers, sanitary napkins, blood-sucking cotton balls, and medical ice packs. Background technique [0002] Water-absorbent resin is a kind of macromolecules containing hydrophilic groups and cross-linked structures. It was first prepared by Fanta and others by saponification of starch-grafted polyacrylonitrile. However, due to the toxicity of monomeric acrylonitrile, the application of such products restricted. In recent years, non-toxic hygienic, highly absorbent water-absorbent resins have been developed. Among them, the acrylic acid water-absorbent resin obtained by polymerization of acrylic acid and its salt as a monomer i...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/02C08J7/04C08J3/24C08L33/02C08K5/053C08F220/06A61L15/24A61L15/60
Inventor 李春华卫琦王勇任娇娇韩洋王俊宇陈明森慕宗廷孙家宽丁建生
Owner WANHUA CHEM GRP CO LTD
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