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High water absorption resin, and preparation method

A technology of a superabsorbent resin and a manufacturing method, applied in the field of superabsorbent resin and its manufacture, can solve the problems of human body damage, reduction of residual monomer content, environmental pollution and the like

Inactive Publication Date: 2007-10-10
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Adding ammonia, amines or sulfites is very effective in reducing the content of residual monomers, but it will cause a decrease in water absorption. If the amount of addition is insufficient, the effect of reducing residual monomers is very limited; in addition, the use of ammonia, amines, sulfurous acid Salt will also be dissolved in aqueous solution and will come into contact with the human body, causing damage to the human body and pollution to the environment
The method of using an initiator can only reduce the residual monomer on the surface of the colloid, but the residual monomer inside the colloid has no effect, and will cost a high cost; High and time-consuming is not conducive to the application of the process; the method of using steam to preheat and then dry has the disadvantages of cumbersome process, difficult control and high depreciation rate of damage to on-site machinery and equipment

Method used

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  • High water absorption resin, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Add 30g of acrylic acid and 32.4g of water into a 100c.c conical flask; in addition, weigh 24.3g of 48% sodium hydroxide aqueous solution in a 100c.c conical flask, and slowly add the sodium hydroxide aqueous solution into the acrylic acid aqueous solution under ice-cooling Neutralization is carried out; at this time, an aqueous solution with a monomer concentration of 42 wt% is obtained, in which 70 mol% (molar ratio) of acrylic acid is partially neutralized to sodium acrylate.

[0046] 2) Add 0.046g of glycerol polyethylene glycol triglycidyl ether (n=7) to the partially neutralized acrylic acid solution, and maintain the temperature at about 20°C.

[0047] 3) Add 0.016 g of L-ascorbic acid, 0.2 g of sodium persulfate and 0.2 g of 2.2-azobis(2-amidinopropane) dihydrochloride to initiate the reaction.

[0048] 4) After the reaction, the superabsorbent resin is cut into gels with a diameter of less than 2 mm by using a cutting mill.

[0049] 5) Dry at 130° C. for 2 ...

Embodiment 2

[0053] Repeat the steps of Example 1, but change Step 6 to add 0.6g of ethylene glycol carbonate / water / methanol=1 / 1 / 1 (weight ratio) solution, and the rest are the same as Example 1 to obtain superabsorbent resin, and measure the holding power 31.26g / g, 20g / cm 2 Water absorption rate under pressure 30.43g / g, 49g / cm 2 The water absorption rate under pressure is 23.28g / g. Take this super absorbent resin and pour it into a combined screen of 850μm, 600μm, 300μm, 250μm, 180μm, and 150μm. >600μm accounts for 28.6%, >300μm accounts for 40.3%, >250μm accounts for 12.4%, >180μm accounts for 6.4%, >150μm accounts for 0.8%, 2 Water absorption rate under pressure 32.1g / g, 49g / cm 2 The water absorption rate under pressure is 23.1g / g.

Embodiment 3

[0055] Repeat the steps of Example 1, but step 6 is changed to add ethylene glycol carbonate / water / long carbon chain alkyl polyvinyl ether=1 / 1 / 0.5 (weight ratio) solution 0.6g, and all the other are the same as Example 1 to obtain high water absorption Resin, measured retention force is 32.08g / g, 20g / cm 2 Water absorption rate under pressure 31.77g / g, 49g / cm 2 The water absorption rate under pressure is 22.68g / g. Take this super absorbent resin and pour it into a combined screen of 850μm, 600μm, 300μm, 250μm, 180μm, and 150μm. >600μm accounts for 31.4%, >300μm accounts for 35.6%, >250μm accounts for 10.6%, >180μm accounts for 7.8%, >150μm accounts for 2.2%, 2 Water absorption rate under pressure 31.5g / g, 49g / cm 2 The water absorption rate under pressure is 22.7g / g.

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Abstract

This invention discloses a method for producing high-water-absorbent resin. The method comprises: (1) adding highly hydrophilic acid-containing monomer aqueous solution with long-chain polycyclic epoxy compound neutralization rate higher than 50 mol.% for free radical polymerization; (2) wind-drying at 100-180 deg.C, pulverizing, and screening; (3) performing surface crosslinker coating treatment by a mixer; (4) performing surface treatment at 90-230 deg.C. The acid-containing monomer is one or more of acrylic acid, methacrylic acid and 2-allylamine-2-methylpropane sulfonic acid. The substrate used in the internal mixing chamber of the mixer is soft or elastic substrate with thermal distortion point higher than 100 deg.C. More than one set of shaker, striker or roller are fixed on the outside of the stir-type mixing chamber to reduce the adhesion of the high-water-absorbent resin on the mixing chamber.

Description

technical field [0001] The invention relates to a superabsorbent resin and its manufacturing method. In particular, it is a water-absorbent resin with high hydrophilicity, low residual unreacted monomer, high retention force and high absorption rate under pressure and its production method. Background technique [0002] The superabsorbent resin has a strong water retention capacity, can absorb a hundred times or even a thousand times its own weight of water, and can swell after absorbing water, and maintain a non-flowing state, even if pressure is applied, it will not leak, and the absorbed water Can be released slowly in the atmosphere. Due to the above characteristics, it has long been used as soil water retaining agent in agriculture and forestry. In recent years, due to considerable progress in the production technology of superabsorbent resin, it is also widely used in sanitary products such as diapers, adult incontinence products and Water-absorbing agents for women'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/06C08F2/44C08K5/17C08K5/151
Inventor 刘顺忠施凯耀许正辉江政富
Owner FORMOSA PLASTICS CORP