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Superstrong water absorbent and its preparation method

A super absorbent and initiator technology, which is applied in the field of konjac flour grafted acrylic acid super absorbent, can solve the problems of uneven viscosity and stirring, and achieve the effects of gel strength biodegradation, high water absorption rate and simple structure

Inactive Publication Date: 2004-11-17
WUHAN LICHENG BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a preparation method of a superabsorbent, which has a simple process and solves the problem of uneven stirring after the viscosity increases in the copolymerization reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] After adding 4.5 parts of konjac powder and 100 parts of water to gelatinize at a temperature of 40° C. (solid content 4.5%), add cooled acrylic acid (neutralization degree is 80mol%) with sodium hydroxide part by proportional pump, The mass ratio of konjac whole powder to acrylic acid is 1:50. Add 0.5wt% acrylic acid initiator potassium persulfate and 0.1wt% cross-linking agent N, N'-methylenebisacrylamide, stir and protect with nitrogen, and initiate the graft copolymerization reaction at 60 ° C, then use nitrogen Accompanied by the reaction liquid injection into the spiral tube turbulent flow reactor with a temperature of 90°C for graft copolymerization, the reaction time is 240Sec, and the spiral extrusion is sent to the drum-type film forming dryer to make the reactant dry in the form of a film, and the drying temperature is 140°C , drying time 2min. After drying, the product is in the form of a thin film, and is crushed into a 120-mesh granular product. The prod...

example 2

[0018] After adding 3.5 parts of konjac fine powder and 100 parts of water to gelatinize at a temperature of 35°C (solid content 3.5%), add cooled acrylic acid partially neutralized with sodium hydroxide (neutralization degree is 70mol%) through a proportional pump, The mass ratio of konjac fine powder to acrylic acid is 1:80. Add 0.4wt% of acrylic acid initiator potassium persulfate and 0.2wt% crosslinking agent N, N'-methylenebisacrylamide, stir and protect with nitrogen, after the graft copolymerization reaction is initiated at a temperature of 50 ° C, the Accompanied by the reaction liquid injection into the spiral tubular turbulent flow reactor with a temperature of 85°C for graft copolymerization, the reaction time is 180Sec, the spiral extrusion is sent to the drum type film forming dryer, and the reactant is dried in the form of a film, and the drying temperature is 140°C , drying time 2min. After drying, the product is in the form of a thin film, which is crushed int...

example 3

[0020] After adding 4.5 parts of konjac powder and 100 parts of water to gelatinize at a temperature of 40°C (solid content 4.5%), add cooled acrylic acid (neutralization degree is 85mol%) partially neutralized with sodium hydroxide by a proportional pump, The mass ratio of konjac whole powder to acrylic acid is 1:50. Add 0.8wt% acrylic acid initiator ammonium persulfate and 0.7wt% crosslinking agent N, N'-methylenebisacrylamide, stir and protect with argon, and initiate graft copolymerization reaction at 60°C, then The argon gas is injected into the spiral tubular turbulent flow reactor with a temperature of 90°C along with the reaction liquid to carry out graft copolymerization. The reaction time is 240Sec, and the spiral extrusion is sent to the drum-type film forming dryer to make the reactant dry in the form of a film. The drying temperature 150°C, drying time 2min. After drying, the product is in the form of a thin film, and is crushed into a 120-mesh granular product. ...

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Abstract

An ultra-strong water absorbent is prepared through adding water to konjak starch, gelatinizing at a certain temp., graft copolymerization by pumping locally netralized acrylic acid monomer, trigger and cross-linking agent while introducing N2 gas or Argno gas, spraying into a spiral tube type turbulence reactor, graft copolymerization, then screen extruding out, drying in a rolling drum type film forming dryer, and pulverizing to obtain granular product. Its advantages are high hydroscopicity (500-20000 times), and biodegradable.

Description

technical field [0001] The invention relates to a konjac flour graft copolymerized acrylic acid (salt) super water absorbing agent, and also relates to a preparation method of the super water absorbing agent. Background technique [0002] Existing water-absorbing agents are mainly divided into two categories: one is chemically synthesized polymer water-absorbing resins, such as polyacrylic acid resins; the other is starch-based super-absorbing agents. Chemically synthesized polymer resins can be stably industrialized at present, but the three wastes in the process are serious, consume a lot of energy and water, and are difficult to degrade after use, causing pollution to the environment. The supply of such water-absorbing agents in China is mainly due to technical and cost reasons. Rely on imports. The industrialized production of starch-based water-absorbing agents is still in its infancy, and the stability of the process technology is poor, such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00
Inventor 姜发堂刘爱红袁世矩
Owner WUHAN LICHENG BIOTECH
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