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High-efficiency and low-consumption reversed phase suspension polymerization preparation technology for water-absorbing compounds

A technology of reversed-phase suspension and water absorption, which is applied in the field of reversed-phase suspension preparation technology, and achieves the effects of simple and efficient control of system temperature, simple and continuous change, and avoiding the decline of production stability.

Active Publication Date: 2020-11-24
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to effectively remove the heat of reaction in the polymerization process, and reduce the energy loss and efficiency reduction in the multi-stage polymerization process (frequent heating and cooling) is a difficulty that limits the large-scale industrialization of reversed-phase suspension polymerization.

Method used

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  • High-efficiency and low-consumption reversed phase suspension polymerization preparation technology for water-absorbing compounds
  • High-efficiency and low-consumption reversed phase suspension polymerization preparation technology for water-absorbing compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 6.9g of sucrose fatty acid ester (Synthetic Technology, S-370) and 2000g of industrial grade n-heptane into a 10L stainless steel polymerization kettle, heat up the jacket to 35°C and disperse it evenly at a stirring speed of 200rpm to obtain oil Phase to spare. 600g of sodium hydroxide solution with a mass concentration of 32% and 860g of acrylic acid aqueous solution with a mass concentration of 53.5% are simultaneously added to the polymerization kettle in a certain proportion through two feeding ports, so that acid-base neutralization reaction occurs in the polymerization kettle. Use neutralization heat to gradually dissolve and disperse the dispersant S-370 in the oil phase. When the temperature of the system drops below 40°C, add 0.46g of potassium persulfate, 0.23g of 2,2'-azobisisobutylamidine dihydrochloride (AIBA) and 0.1g of ethylene glycol diglycidyl ether 30g of the aqueous solution, fully dissolved and mixed to obtain a section of water-phase mixed li...

Embodiment 2

[0044] Repeat Example 1, the difference is: replace the filtered n-heptane with 1800g of fresh n-heptane, and the added amount of dispersant is 5.0g.

Embodiment 3

[0046] Repeat embodiment 1, difference is: replace the normal heptane that filters out with the fresh normal heptane of 2000g, and the additional amount of dispersing agent is 5.5g, and the two-stage aqueous phase mixed liquid addition becomes 2085g (embodiment 1.4 times of the mixed solution of the second-stage water phase in 1).

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Abstract

The invention provides a high-efficiency and low-consumption reversed phase suspension polymerization preparation technology for water-absorbing compounds. The preparation technology includes the following steps: a, mixing a primary water phase mixing solution (in situ neutralization) and an oil phase solution, and performing reversed phase suspension polymerization reaction of a first stage so asto obtain a first suspension solution; b, filtering an oil phase in which most dispersing agents are dissolved, replacing the oil phase with a new dispersing agent free oil phase, continuously addinga secondary water phase mixing solution into the first suspension solution to perform reversed phase suspension polymerization reaction of a second stage so as to obtain a second suspension solution,and re-supplementing and adding the dispersing agents with corresponding amount before secondary polymerization; and c, performing azeotropic dehydration and surface crosslinking on the second suspension solution, and performing filtering and drying to obtain water-absorbent resin.

Description

technical field [0001] The invention relates to a process for preparing water-absorbent resin in reverse phase suspension. Background technique [0002] Superabsorbent Polymers (SAP, Superabsorbent Polymers) is a lightly cross-linked polymer compound. Due to its strong water absorption and water retention capabilities, it is widely used in the field of sanitary materials such as diapers and sanitary napkins. Cables and optical cables are used for resistance. Water materials and water retaining agents for agriculture, forestry and gardening, etc. As water-absorbent resins for hygienic materials, polyacrylic acid partially neutralized products, starch-acrylic acid graft polymer neutralized products, starch-acrylonitrile graft polymer hydrolyzate, vinyl acetate-acrylate copolymers are known. Saponification of substances, etc. [0003] As a method for producing such a water-absorbent resin, an aqueous solution polymerization method, a reversed-phase suspension polymerization m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/18C08F120/06C08F4/04C08F4/30C08F20/56C08F20/54
CPCC08F2/18C08F120/06C08F4/04C08F4/30C08F20/56C08F20/54
Inventor 丁明强赵帅王晓姜云翔马磊纪学顺孙家宽
Owner WANHUA CHEM GRP CO LTD
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