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Method for fabricating high water absorption resin

A technology of super absorbent resin and manufacturing method, which is used in absorbent pads, medical science, bandages, etc., can solve the problems of high dust volume and poor recovery efficiency, and achieve the effects of stable reaction temperature, improved production quality, and improved uniformity.

Active 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

[0023] The above two recovery methods have the disadvantages of high dust volume in operation or poor recovery efficiency

Method used

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  • Method for fabricating high water absorption resin
  • Method for fabricating high water absorption resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) First add 17.35kg of 49% sodium hydroxide aqueous solution and 30.52kg of water in a 100L reaction tank, and then slowly add 22.53kg of acrylic acid into the aqueous sodium hydroxide solution under ice bath for neutralization; at this time, the monomer Concentration 38.6wt% aqueous solution, in which 68mole% acrylic acid is partially neutralized to sodium acrylate.

[0065] (2) Add 33.80 g of glycerol polyethylene glycol triglycidyl ether (n=7) to the partially neutralized acrylic acid aqueous solution, and maintain the temperature at about 20°C.

[0066] (3) Control the flow rate of the above-mentioned sodium acrylate solution to be 70.4kg / hr, and then make it enter the mixing body from 1 in Fig. 2 of the description of the present invention.

[0067] (4) Control the feeding amount of the water-absorbing resin with a particle size of less than 100 μm (hereinafter collectively referred to as fine powder) to 1.02 kg / hr, and enter the mixing body from 6. in Figure 2 o...

Embodiment 2

[0076] Repeat embodiment one, but the feeding amount of step 4 changes 1.53kg / hr into. The results showed that the reaction material and the fine powder were well mixed, the temperature of the polymerization reaction was stable, and there was no colloid formed on the screw or at the outlet elbow. The viscosity of the discharged reaction material is 7.2cP, the soluble content of the finished product is 2.51%, the absorption rate is 71.75 seconds, and 49g / cm 2 The absorption rate under pressure is 25.39g / g.

Embodiment 3

[0078] Repeat embodiment one, but the feeding amount of step 4 changes 2.04kg / hr into. The results showed that the reaction material and the fine powder were well mixed, the temperature of the polymerization reaction was stable, and there was no colloid formed on the screw or at the outlet elbow. The viscosity of the discharged reaction material is 7.8cP, the soluble content of the finished product is 2.49%, the absorption rate is 67.23 seconds, and 49g / cm 2 The absorption rate under pressure is 25.17g / g.

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Abstract

This invention discloses a method for producing powdery and water-insoluble high-water-absorbent resin with low soluble content. The high-water-absorbent resin can absorb water, urine and blood. The method comprises: (1) adding crosslinking agent to acid-containing monomer aqueous solution with a neutralization rate higher than 50 mol.%, and performing free radical polymerization; (2) standing monomer solution, catalyst and water-absorbent resin (less than 100 mu.m) in a mixer with at least one screw for 3-600 s; (3) drying with 100-250 deg.C hot wind, pulverizing, and screening; (4) coating with surface crosslinking agent; (5) performing surface thermal treatment at 80-230 deg.C; (6) adding inert organic salt powder. The acid-containing monomer is selected from acrylic acid, methacrylic acid and 2-allylamine-2-methylpropane sulfonic acid, and the monomer aqueous solution contains 0-5 wt. % of water-soluble polymer.

Description

technical field [0001] The present invention mainly provides a method for producing superabsorbent resin, through which the polymerization reaction can be made more uniform to reduce the soluble content of the water-absorbent resin, and the operability of the recycling process or finished fine powder can be improved. 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 was first used as a 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 women's hy...

Claims

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Application Information

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IPC IPC(8): C08F20/06C08F2/44C08F4/40C08K5/05A61L15/24C08L3/02C08L3/04C08L29/04
Inventor 施凯耀吴政璋黎元中许正辉江政富钟宏宗
Owner FORMOSA PLASTICS CORP
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