Method for preparing low-leaching-rate water-swellable rubbers

A technology of water-swellable rubber and dissolution loss rate, applied in the field of functional materials, can solve the problems of complex compatibilizer synthesis process, low dissolution rate of water-swellable rubber, and high equipment requirements, achieving good water retention performance and low equipment requirements. , the preparation method is simple

Inactive Publication Date: 2011-02-16
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wang Caiqi used amphiphilic polyoxyethylene polybutyl acrylate block copolymer (PEO-b-PBA) as a compatibilizer for natural rubber and cross-linked sodium polyacrylate (SAP) to prepare water-swellable rubber Although the rate is low, the compatibilizer synthesis process is complicated and the equipment requirements are high

Method used

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  • Method for preparing low-leaching-rate water-swellable rubbers
  • Method for preparing low-leaching-rate water-swellable rubbers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 superabsorbent resin preparation

[0025] Preparation of superabsorbent resin: prepare mixed monomers according to 60 parts by weight of methacrylic acid and 40 parts by weight of acrylamide, add 0.8 parts by weight of crosslinking agent N-N'-methylenebisacrylamide and 0.6 parts by weight of initiator K 2 S 2 o 8 , mixed and dissolved to obtain mixed solution A. In a certain reaction vessel, add 300 parts by weight of cyclohexane and 20 parts by weight of dispersant Span80, stir and heat up to 70-80°C, add the mixed solution A dropwise, after the dropwise addition, react at constant temperature for 5-6 hours, cool, and The reaction product was poured into a beaker filled with methanol, stirred to fully precipitate the reaction product, filtered with suction, washed several times with methanol, and dried in a vacuum box to obtain super absorbent resin A;

Embodiment 2

[0026] Embodiment 2 superabsorbent resin preparation

[0027] Preparation of superabsorbent resin: prepare mixed monomers according to 40 parts by weight of acrylic acid, 30 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid and 30 parts by weight of acrylamide, and add 1.2 parts by weight of crosslinking agent N-N'-sub- Methylbisacrylamide and 0.6 parts by weight of initiator K 2 S 2 o 8 , mixed and dissolved to obtain mixed solution B. In a certain reaction vessel, add 500 parts by weight of cyclohexane and 30 parts by weight of dispersant Span80, stir and heat up to 70-80°C, add the mixed solution B dropwise, after the dropwise addition, react at constant temperature for 5-6 hours, cool, and Pour the reaction product into a beaker filled with methanol, stir to fully precipitate the reaction product, filter it with suction, wash it several times with methanol, and dry it in a vacuum box to obtain superabsorbent resin B;

Embodiment 3

[0028] Embodiment 3 superabsorbent resin preparation

[0029] Preparation of superabsorbent resin: prepare mixed monomers according to 80 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid methacrylic acid and 20 parts by weight of acrylamide, and add 1.5 parts by weight of crosslinking agent N-N'-methylene Bisacrylamide and 0.4 parts by weight of initiator K 2 S 2 o 8, mixed and dissolved to obtain mixed solution C. In a certain reaction vessel, add 200 parts by weight of cyclohexane and 20 parts by weight of dispersant Span80, stir and heat up to 70-80°C, add the mixed solution C dropwise, after the dropwise addition, react at constant temperature for 5-6 hours, cool, and The reaction product was poured into a beaker filled with methanol, stirred to fully precipitate the reaction product, filtered with suction, washed several times with methanol, and dried in a vacuum box to obtain super absorbent resin C;

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Abstract

The invention relates to a method for preparing low-leaching-rate water-swellable rubbers. The prepared low-leaching-rate water-swellable rubber comprises the following raw materials in parts by weight: 100 parts of obtained modified rubbers, 10 to 40 parts of obtained super water absorbent resins, 5 to 30 parts of plant fiber powder, 2 to 8 parts of zinc oxide, 0.2 to 1 parts of stearic acid, 1 to 5 parts of sulphur, 0.5 to 4 parts of dibenzothiazyl disulfide, 10 to 80 parts of filler, and 5 to 50 parts of softener, and the method comprises the following steps: mixing the raw materials for 5 to 60 minutes; standing the obtained mixture for 10 to 12 hours; and carrying out vulcanization and pressure molding on the obtained deposit so as to obtain the low-leaching-rate water-swellable rubbers. The rubbers prepared by using the method of the invention have the characteristics of high expansion ratio, low leaching rate and good water retention performance. The invention overcomes the defects that strongly polar bibulous trees subjected to soaking in traditional water-swellable rubbers are easy to desorb from the rubbers, and the expansion rate of the traditional water-swellable rubber after used repeatedly is reduced; and the preparation method is simple, and low in equipment requirement.

Description

technical field [0001] The invention relates to a preparation method of a water-swellable rubber with a low dissolution rate and belongs to the field of functional materials. Background technique [0002] Water-swellable rubber (WSR) is a new type of functional polymer material. Since its appearance in the 1970s, in order to overcome the permanent deformation and creep of waterproof and leak-proof rubber sealing materials widely used in underground, water and buildings, etc. And the disadvantages of poor sealing and water-stop failure caused by the curing shrinkage of the embedding material, people have invented the alloying of hydrophilic materials and elastomers to form a rubber-like elasticity and strength, and at the same time have water-absorbing expansion. , Under the condition of extrusion, it can retain water, achieving a double water-stop function material that can adapt to structural changes and has water-absorbing expansion to stop water. A little pressure on it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/04C08F220/56C08L51/04C08K5/47C08K3/36C08L33/24C08F220/58C08F220/06C08L33/02C08K3/22C08L97/02C08K3/06
Inventor 江学良胡凯范一泓周爱军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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