Superstrong water absorber and its preparation method

A super water-absorbing agent and initiator technology, which is applied in the field of konjac flour grafted acrylic acid super-absorbing agent, can solve problems such as uneven viscosity and stirring, achieve gel strength biodegradation, easy process parameters, and fast water absorption Effect

Inactive Publication Date: 2003-04-16
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 Applications(China)
IPC IPC(8): C08F251/00
Inventor 姜发堂刘爱红袁世矩
Owner WUHAN LICHENG BIOTECH
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