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A superabsorbent resin prepared by one-step reverse-phase suspension polymerization and its preparation method

A technology of superabsorbent resin and reverse phase suspension, which is applied in the field of superabsorbent resin, can solve the problems of lengthy polymerization process, cumbersome operation, high process and equipment requirements, and achieve short process flow, simple operation and low equipment requirements. Effect

Active Publication Date: 2020-05-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These multi-step polymerization methods are relatively cumbersome to operate and the polymerization process is lengthy, requiring high technology and equipment.

Method used

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  • A superabsorbent resin prepared by one-step reverse-phase suspension polymerization and its preparation method
  • A superabsorbent resin prepared by one-step reverse-phase suspension polymerization and its preparation method
  • A superabsorbent resin prepared by one-step reverse-phase suspension polymerization and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 300 g of n-heptane into a 1 L four-neck round bottom flask equipped with a stirrer, reflux condenser, thermometer and nitrogen inlet tube. 1.84g of sucrose fatty acid ester (S-370, HLB=3.0) was added thereto, the temperature was raised to 50°C and stirred at a stirring speed of 300rpm to dissolve and disperse evenly, and then the temperature was lowered to 30°C.

[0034] 92 g of an aqueous acrylic acid solution (35% by mass) was charged into a 500 mL Erlenmeyer flask, and 120 g of a 32% w.t. sodium hydroxide aqueous solution was dropped into the Erlenmeyer flask while cooling. Then 0.184 g of potassium persulfate, 0.04 g of ethylene glycol diglycidyl ether, and 86 g of deionized water were added thereto to obtain an aqueous solution of acrylic acid monomer.

[0035]The aqueous solution of acrylic acid monomer was added into the above-mentioned four-neck round bottom flask, and nitrogen gas was blown in for 30 minutes while stirring. Then the temperature of the wate...

Embodiment 2

[0037] Except that the addition amount of the nano-silica aqueous solution was changed to 5.52g, other operating procedures were the same as in Example 1, and the SAP particles in the shape of agglomerated grape bunches were obtained.

Embodiment 3

[0039] Except that the 0.5% aluminum oxide aqueous solution with 4.6g mass concentration replaces 1.84g mass concentration with 0.5% nano silicon dioxide (Deshan Chemical Industry) aqueous solution, other operating procedures are the same as embodiment 1, and obtain the grape bunch shape of agglomerated state of SAP particles.

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Abstract

The present invention provides a superabsorbent resin prepared by reverse-phase suspension polymerization and a preparation method thereof, specifically a method for preparing grape bunch-like superabsorbent resin with a suitable particle size by one-step reverse-phase suspension polymerization, comprising the following steps: a. In a hydrophobic solvent dissolved with a dispersant, with / or without an internal crosslinking agent, a free radical polymerization initiator is used to make the water-soluble vinyl unsaturated monomer undergo one-step water-in-oil reaction Phase suspension polymerization to form a slurry of water-containing polymer gel particles; b. adding inorganic particle additives to the slurry obtained in step a, destroying the protective effect of the dispersant, making the water-soluble polymer particles adsorb each other, and obtaining agglomeration c. distilling off water and hydrophobic organic solvents from the mixture obtained in step b to obtain grape bunch-like SAP particles, and drying to obtain the target SAP product. After simple sieving, more than 70% of the particles have a particle size of 150-800 microns.

Description

technical field [0001] The present invention relates to a superabsorbent resin and its preparation method, more specifically to a method for preparing a superabsorbent resin by one-stage reverse phase suspension polymerization in the presence of inorganic particles and the prepared superabsorbent resin. Background technique [0002] Superabsorbent resin 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, water-blocking materials for cables, and special products for agriculture, forestry and gardening. Water retaining agent, etc. [0003] As water-absorbent resins used in hygienic materials, polyacrylic acid partially neutralized products, starch-acrylic acid graft polymer neutralized products, starch-acrylonitrile graft polymer hydrolyzate, vinyl acetate-acrylate Saponified products of copolymers, etc. [0004] As a method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08K3/36C08K3/22C08K5/103
CPCC08K3/22C08K3/36C08K5/103C08K2003/2227C08K2003/2241C08K2201/003C08K2201/011C08L33/02
Inventor 丁明强李春黄岐善
Owner WANHUA CHEM GRP CO LTD