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A kind of one-step polymerization method to prepare superabsorbent resin and preparation method thereof

A technology of superabsorbent resin and polymerization method, which is applied in the field of superabsorbent resin preparation, can solve problems such as poor economy, high production energy consumption, and high equipment requirements, and achieve the effect of reducing production risk and production energy consumption

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, frequent cooling and heating will have extremely high requirements on the equipment, and at the same time, the production energy consumption is huge and the economy is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 0.7 g of sucrose fatty acid ester and 180 g of n-heptane were added to a 1 L round-bottomed flask, and were uniformly dispersed at a stirring speed of 300 rpm to obtain an oil phase. Neutralize 60 g of sodium hydroxide solution with a mass concentration of 32% and 85 g of an aqueous acrylic acid solution with a mass concentration of 52% to obtain an aqueous monomer solution. 3 g of an aqueous solution of g ethylene glycol diglycidyl ether was fully dissolved and mixed to obtain a mixed solution of an aqueous phase and an oil phase. Nitrogen was bubbled for 15 min while stirring, and then the temperature was raised to 70 °C, and the reaction was carried out under this condition for 1.5 h to obtain a one-step polymerized SAP particle suspension.

[0079] The suspension obtained by the one-step polymerization was cooled to 50° C., kept stirring at 400 rpm, and 40 g of polyacrylate emulsion 2 was added dropwise with a peristaltic pump for 0.5 hours and continued stirring fo...

Embodiment 2

[0082] Example 1 was repeated, except that 30 g of polyacrylate emulsion 3 was added, the dripping time was 15 min, and the stirring speed was kept at 500 rpm.

Embodiment 3

[0084] Example 1 was repeated with the following differences: 80 g of polyacrylate emulsion 1 was added, the dropping time was 2 h, the internal crosslinking agent was replaced by ethylene glycol diglycidyl ether with polyethylene glycol diacrylate, and the dosage was changed to 0.19 g.

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Abstract

The invention discloses a one-step polymerization method for preparing superabsorbent resin and its preparation method. It comprises the following steps: a), one-step polymerization: the monomer-containing water phase and the oil phase are mixed to initiate polymerization to obtain a one-step polymerization suspension; b), particle agglomeration: keep stirring, add to step a) Polyacrylate emulsion to achieve particle agglomeration; c), post-treatment: azeotropic dehydration and surface cross-linking of the system after particle agglomeration, and separation of the oil phase from the obtained superabsorbent resin by filtration, drying to obtain the product . There is no need for two-stage feeding polymerization, which can effectively avoid frequent temperature rise and fall, effectively improve production efficiency and reduce energy consumption. Can be used in the field of health care.

Description

technical field [0001] The invention relates to the field of superabsorbent resin preparation, in particular to a superabsorbent resin prepared by a one-step polymerization method based on a reversed-phase suspension process. Background technique [0002] Super Absorbent Resin (SAP) is a cross-linked polymer compound with very strong water absorption and water retention capabilities. It is a synthetic polymer material that can absorb about 500 times to about 1000 times its own weight in water. Used in hygiene products, such as children's diapers, feminine hygiene products, adult diapers, etc. In the future, with the further strengthening of the global aging trend, its market demand will have a large space. [0003] At present, the manufacturing process of SAP is roughly divided into two types. About 95% are prepared by aqueous solution polymerization process, and about 5% are prepared by reversed-phase suspension process. Although the current production share of the revers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/16C08J3/24C08L33/02C08L33/08
CPCC08J3/16C08J3/24C08J2333/02C08J2433/08
Inventor 王晓丁明强马吉全郝超姜云翔马磊纪学顺孙家宽
Owner WANHUA CHEM GRP CO LTD