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Method for preparing anti-phase suspension polymeric polyacrylic acid/acrylamide high water absorption resin

A super absorbent resin, acrylamide technology, applied in the field of super absorbent resin, can solve the problems of reaction explosion, gel sticking to the wall, etc.

Inactive Publication Date: 2008-07-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyacrylic acid / acrylamide superabsorbent resin is prepared by the reverse phase suspension polymerization method. If the suspension dispersion system is unstable, a gel-like viscous product will be obtained, and there are also phenomena such as reaction violent polymerization and gel sticking to the wall.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Add 100 ml of cyclohexane into the three-necked flask, add 0.4 g of dispersant cetyl phosphoester, and stir at room temperature. 15 grams of acrylic acid was placed in a beaker, and neutralized with 15.27 grams of 30% sodium hydroxide aqueous solution at 0°C. After dissolving 0.08 g of ammonium persulfate and 0.016 g of N, N'-methylene bisacrylamide in 19.968 g of water, add it to the neutralized acrylic acid aqueous solution and stir evenly, then add 5 g of acrylamide, stir to make all Dissolved to obtain a monomer mixture. The temperature of the three-neck flask was raised to 45°C, and the monomer mixture was added dropwise. After 50 minutes of dropping, the temperature was raised to 65°C, and the reaction was carried out for 4 hours. After the reaction, cool down to room temperature, filter, wash the product with methanol, and dry at 110°C to obtain a granular polyacrylic acid / acrylamide superabsorbent resin. The water absorption of the obtained superabsorbent resi...

Embodiment 2

[0011] Add 100 ml of cyclohexane into the three-necked flask, add 0.25 g of dispersant stearyl phosphoester, and stir at room temperature. 20 grams of acrylic acid was placed in a beaker, and neutralized with 19.63 grams of 30% sodium hydroxide aqueous solution at a temperature of 1°C. Dissolve 0.05 g of ammonium persulfate and 0.017 g of N, N'-methylenebisacrylamide in 25 g of water, add to the neutralized acrylic acid solution and stir evenly, then add 5 g of acrylamide, stir to make all Dissolved to obtain a monomer mixture. The temperature of the three-neck flask was raised to 45°C, and the monomer mixture was added dropwise, and the addition was completed in 40 minutes, and the reaction was continued for 4 hours. After the reaction, cool down to room temperature, filter, wash the product with methanol, and dry at 100°C to obtain a granular polyacrylic acid / acrylamide superabsorbent resin. The water absorption of the obtained superabsorbent resin was 346 ml / g.

Embodiment 3

[0013] Add 100 ml of cyclohexane into the three-necked flask, add 0.84 g of dispersant cetylphosphoester, and stir at room temperature. 16 grams of acrylic acid was placed in a beaker, and neutralized with 14.8 grams of 30% sodium hydroxide aqueous solution at a temperature of 2°C. Dissolve 0.07 g of ammonium persulfate and 0.015 g of N,N'-methylenebisacrylamide in 21 g of water, add to the neutralized acrylic acid solution and stir evenly, then add 5 g of acrylamide, stir to make all Dissolved to obtain a monomer mixture. The temperature of the three-neck flask was raised to 45°C, and the monomer mixture was added dropwise. After 43 minutes, the temperature was raised to 75°C, and the reaction was carried out for 4 hours. After the reaction, cool down to room temperature, filter, wash the product with methanol, and dry at 90°C to obtain a granular polyacrylic acid / acrylamide superabsorbent resin. The water absorption of the obtained superabsorbent resin was 312 ml / g.

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Abstract

The invention relates to a process for preparing a high water absorbing resin of anti-phase suspension polymerization polyacrylic acid / acrylamide, which is characterized in that cyclohexane is dissolvent, alkylating agent and acrylamide are monomers, ammonium peroxodisulfate is initiating agent, N,N'-methylene methylene is cross linker, octadecyl alcohol phosphatides is dispersing agent. polyacrylic acid / acrylamide high water absorbing resin is prepared by adopting an anti-phase suspension polymerization method, and the water absorption ratio of the high water absorbing resin which is prepared by the invention is 298ml / g-346ml / g.

Description

technical field [0001] The invention belongs to the field of superabsorbent resins, and in particular relates to a preparation method of reverse-phase suspension polymerization polyacrylic acid / acrylamide superabsorbent resins. Background technique [0002] Superabsorbent resin is a new type of functional polymer material that has been developed rapidly in recent years. Because it can absorb water hundreds to thousands of times its own mass, and the absorbed water is not easy to be squeezed out by mechanical pressure, it has excellent properties. Excellent water retention performance, so it is widely used in agriculture, forestry, horticulture and other soil amendments, sanitary materials, industrial dehydrating agents, preservatives, anti-fogging agents, medical materials, hydrogel materials, etc. The representative one is acrylic superabsorbent resin, which has developed rapidly at home and abroad in recent years. However, the water absorption rate of the water-absorbing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F2/32
Inventor 白福臣温诗渺于力张志成潘振远张春晓
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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