Synthesis method for resin with high water absorbability

A technology of super absorbent resin and synthesis method, applied in chemical instruments and methods, absorbent pads, fertilizer mixtures, etc., can solve the problems of high equipment cost, nuclear pollution, difficulty in energy consumption and control, and explosive environment, and achieve production operations. With simple controls, strong weather resistance, and simple equipment effects

Active Publication Date: 2012-08-01
珠海农神生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain excellent product quality, there are outstanding problems affecting its development: a large amount of organic solvents are used, which must be processed and recovered in the process. Due to the flammability and explosion of the solvent, the operation of process equipment is very strict. There is a danger of explosion and pollution to the environment
[0007] In summary, the above three polymerization methods require chemical initiators, heating and temperature control, or nuclear energy when initiating free radical polymerization of monomers, which not only requires energy consumption and control difficulties, but also requires high equipment costs. and the potential danger of nuclear contamination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preferred version of the superabsorbent resin preparation method of the present invention comprises the following steps:

[0039] (1) Put 36.3 parts of acrylic acid into the reaction kettle, neutralize with 32% sodium hydroxide solution to a neutralization degree of 75%, add 0.01 parts by weight of N,N-methylenebis(meth)acrylamide, glycerine 0.05 parts by weight of alcohol, 0.02 parts by weight of polyethylene glycol (200) diacrylate, and 0.1 parts by weight of Span-20, stirred evenly to obtain a polymerization feed liquid;

[0040] (2) Put the material liquid prepared in (1) into a PE plastic bag so that the thickness of the material liquid is about 70mm, and put it in the sun for 6 hours to obtain the water-absorbent resin gel;

[0041] (3) Cutting and granulating the gel obtained in (2), drying, pulverizing, and sieving to obtain a superabsorbent resin.

Embodiment 2

[0043] A preferred version of the superabsorbent resin preparation method of the present invention comprises the following steps:

[0044] A preferred version of the superabsorbent resin preparation method of the present invention comprises the following steps:

[0045] (1) Put 31.9 parts of acrylic acid into the reaction kettle, neutralize with 32% sodium hydroxide solution to a neutralization degree of 80%, add 0.05 parts by weight of N,N-methylenebis(meth)acrylamide, polyethylene 0.05 parts by weight of diol dimethacrylate, 0.02 parts by weight of polyethylene glycol (200) diacrylate, 0.01 parts by weight of trimethylolpropane triacrylate, 0.1 parts by weight of Span-20, and stir evenly to obtain a polymeric material liquid;

[0046](2) Put the material liquid prepared in (1) into a PE plastic bag so that the thickness of the material liquid is about 60 mm, and put it in the sun for 5 hours to obtain the water-absorbing resin gel;

[0047] (3) Cutting and granulating the ...

Embodiment 3

[0049] A preferred version of the superabsorbent resin preparation method of the present invention comprises the following steps:

[0050] (1) Put acrylic acid 39.34 into the reaction kettle, neutralize it with 32% sodium hydroxide solution to a neutralization degree of 85%, add 0.05 parts by weight of N,N-methylenebis(meth)acrylamide, polyethylene glycol 0.02 parts by weight of alcohol (200) diacrylate, 0.01 parts by weight of pentaerythritol triacrylate, 0.01 parts by weight of neopentyl glycol diacrylate, 0.02 parts by weight of alkane oil, and 0.05 parts by weight of Span-20, and stir evenly to obtain a polymeric liquid ;

[0051] (2) Put the material liquid prepared in (1) into a PE plastic bag so that the thickness of the material liquid is about 100mm, and put it in the sun for 5 hours to obtain the water-absorbent resin gel;

[0052] (3) Cutting and granulating the gel obtained in (2), drying, pulverizing, and sieving to obtain a superabsorbent resin.

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Abstract

The invention discloses a method for preparing resin with high water absorbability. The method comprises the following steps of: neutralizing polymerized monomer crylic acid by use of a sodium hydroxide (or potassium hydroxide) solution until the neutralization degree is 70-85 percent, thus obtaining a polymerized monomer solution; sequentially adding a secondary monomer and a cross-linking agent, uniformly mixing, obtaining water absorption resin gel under sunshine radiation for 1 to 6 hours, and cutting and drying the gel to obtain the resin with high water absorbability. According to the method, any chemical initiator, comprising a light initiator, is not added, so that polymerization reaction is not controlled by the concentration of the initiator; and the method has the advantages of easiness for control, environmental friendliness, energy conservation and the like. Furthermore, the obtained resin with high water absorbability is subjected to surface cross-linking treatment and surface compound treatment, so that water absorption resin for a sanitary material and a soil water-retaining agent are obtained and have high water absorbability.

Description

technical field [0001] The invention relates to a method for synthesizing a superabsorbent resin, in particular to a method for synthesizing a superabsorbent resin by sunlight irradiation without an initiator. Background technique [0002] In the polymerization reaction of synthesizing superabsorbent resin, the dominant synthetic route and preparation process are solution polymerization and reverse suspension polymerization with acrylic acid as the main monomer, accounting for more than 90% of all superabsorbent resin production. [0003] Relevant companies have formed their own patented technologies in the known reverse suspension polymerization method for synthesizing superabsorbent resins, such as the patent [US 4093776; US 4446261] of Kao Shijian Company; the patent [US 4340706; US 4340706; US 4683274; EP 0234202]; patent of Nalco Chemical Company [US 2314777]; patent of Lion Corporation of Japan [US 4839395]; patent of catalyst chemistry [EP 0349240]; patent of Sumitomo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F2/48C08L33/02C08J3/24A61L15/24A61L27/42C09K17/40
Inventor 林汉明林焕新肖爱迪
Owner 珠海农神生物科技有限公司
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