Process for preparing high water absorption resin

A super absorbent resin, water-soluble technology, applied in the field of chemical engineering, can solve the problems of complex product crushing and post-processing, low water absorption, low polymerization rate, etc. Effect

Inactive Publication Date: 2005-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the system in the middle and late stages of polymerization in this process is high, heat transfer and stirring are difficult, and the polymerization rate is low, resulting in low molecular weight, low strength, and low water absorption of the resin, and the product crushing and post-processing are complicated, which is not conducive to large-scale industrial production.

Method used

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  • Process for preparing high water absorption resin

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Experimental program
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Effect test

Embodiment 1

[0026] Weigh 5.785g of sodium hydroxide, dissolve in 40ml of deionized water, and cool to room temperature. Measure 13.5 milliliters of acrylic acid (rectified under reduced pressure) in the beaker, under stirring, sodium hydroxide aqueous solution is slowly introduced into acrylic acid for neutralization reaction, after cooling, add 2.415 g of the second monomer methacrylamide and 0.006 g of 1,3- Propylene Glycol Crosslinker, stir until completely dissolved.

[0027] Add 0.8g of Span 80, 0.4g of Tween 20 and 130ml of n-hexane into a 500ml 4-port jacketed reactor with a thermometer, stir and dissolve at room temperature, then add the above monomer aqueous solution and initiator isopropyl peroxide Add 0.09g of benzene, and add 0.006g of polyethylene glycol dimethacrylate into the reaction kettle at the same time, pass nitrogen and exhaust oxygen, heat up to 50°C after cold stirring, and react for 2 hours. After the reaction was completed, water was removed azeotropically at 80...

Embodiment 2

[0030] Weigh 4.235g of sodium hydroxide, dissolve in 30ml of deionized water, and cool to room temperature. Measure 12.1 milliliters of acrylic acid (rectified under reduced pressure) in the beaker, under stirring, sodium hydroxide aqueous solution is slowly introduced into acrylic acid for neutralization reaction, after cooling, add 1.625 g of the second monomer methyl acrylate and 0.004 g of 1-ethyl- 3-[3-(Dimethylamino)propyl]carbodiimide, stirred until completely dissolved.

[0031] Add 0.8g dispersant Span 65 and 170 milliliters of hexanaphthene into 500 milliliters of jacketed reaction kettles with 4 outlets of thermometer, stir and dissolve at room temperature, then add above-mentioned aqueous monomer solution and initiator potassium persulfate 0.05g, and Add 0.004g of ethylene glycol dimethacrylate, pass nitrogen and exhaust oxygen, heat up to 65°C after cold stirring, and react for 0.5 hours. After the reaction was completed, water was removed azeotropically at 90°C. ...

Embodiment 3

[0034] Weigh 7.398g of potassium hydroxide, dissolve in 30ml of deionized water, and cool to room temperature. Measure 12.5 milliliters of acrylic acid (rectified under reduced pressure), slowly introduce potassium hydroxide aqueous solution into acrylic acid for neutralization reaction under stirring, add 0.075 g of the second monomer methacrylic acid and 0.004 g of glutaraldehyde after cooling, and stir until completely dissolve.

[0035] Add 0.8 g of dispersant Span 60 and 170 ml of toluene into a 500 ml 4-hole jacketed reactor with a thermometer, stir and dissolve at room temperature, then add the above-mentioned monomer aqueous solution and 0.05 g of initiator ammonium persulfate, and discharge through nitrogen. Oxygen, after cold stirring, the temperature was raised to 65°C, and reacted for 1 hour, and 0.054 g of ethylene glycol diacrylate was added into the reaction kettle, and the reaction was continued for 1 hour. After the reaction was completed, water was removed a...

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Abstract

The preparation process of high water absorption resin includes following steps: neutralizing acrylic acid monomer with alkali solution to 60-90 % neutralizing degree, adding functional monomer in 0.5-50 % of total monomer weight, water soluble initiator or oxidation-reduction system in 0.05-0.5 % and water soluble cross-linking agent in 0.005-0.2 %; feeding the said mixed liquid into reactor, adding non-polar organic solvent in 2-10 times the volume of the mixed liquid and containing non-ionic surfactant, stirring to form inverse suspended polymerizing system; heating to 35-80 deg.c for free radical cross-linking copolymerization while adding oil soluble cross-linking agent in 0.005-0.3 % total monomer weight; dewatering after finishing polymerization, separation and drying to obtain the high water absorption resin. The obtained polyacrylate resin has the advantages of powerful water absorption, high salt tolerance, high gel strength and fast water absorption speed.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin, in particular to preparing acrylic acid, acrylate and at least one functional monomer through reverse phase suspension polymerization under the action of a water-soluble / oil-soluble composite crosslinking agent. The invention belongs to the technical field of chemical engineering. Background technique [0002] Superabsorbent resin refers to a class of polymer materials whose water absorption is dozens or even thousands of times of its own weight. It was first developed by Fanta of the Northern Research Institute of the United States Department of Agriculture through the graft copolymerization of gelatinized starch and acrylonitrile. In 1975, Japan's Sanyo Chemical Co., Ltd. successfully developed starch-polyacrylic acid graft copolymer superabsorbent resin, and began industrial production in 1978. It is famous for its brand Sannet IM-300. Afterwards, Hercules Company, National S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/40C08F220/00C08K5/04
CPCC08F2/14
Inventor 黄志明黄健包永忠单国荣翁志学
Owner ZHEJIANG UNIV
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