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Method for producing polyacrylic acid-based water-absorbing resin

A polyacrylic acid-based, manufacturing method technology, applied to the field of absorbent articles, can solve problems such as increased packaging and transportation costs, insufficient, impact resistance, liquid retention capacity, absorption capacity, etc., and deterioration of liquid absorption characteristics

Inactive Publication Date: 2020-05-08
宜兴丹森科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Foaming technology can effectively solve the problem of slow water absorption of water-absorbent resin. However, due to the randomness of the bubble size, it is difficult to control the pore size. The pores inside the resin will form a large number of closed-cell structures, which will lead to the accumulation of water-absorbent resin. Excessive reduction in density, increasing packaging and shipping costs
In addition, the thin-walled pore structure formed by foaming polymerization is easily broken due to impact during material transportation, packaging, and transportation, making it difficult to guarantee the stability of physical properties, and the fine powder formed by impact crushing will cause Floating Dust, Environmental Deterioration
The technology disclosed in the said patent improves the liquid absorption rate of the water-absorbent resin, but it is still insufficient
In addition, if the liquid absorption rate is greatly increased, the liquid absorption characteristics of the resin such as impact resistance, ability to conduct and distribute liquid, liquid retention ability, and absorption capacity under pressure will deteriorate.

Method used

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  • Method for producing polyacrylic acid-based water-absorbing resin

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0148] The acrylic acid / sodium acrylate mixed monomer solution (the molar ratio of acrylic acid / sodium acrylate is 2.2 / 7.8) was transported through pipelines, the monomer concentration of acrylic acid / sodium acrylate was 44.0% by weight, and the flow rate of the monomer solution was 8689kg / h. The temperature of the monomer solution is 80-90°C. Polyethylene glycol diacrylate (molecular weight: 522) with a concentration of 11.3% by weight was transported at the branch of the monomer solution pipeline, and the flow rate was 72 kg / h. In addition, an aqueous sodium persulfate solution with a concentration of 4% by weight (flow rate: 60 kg / h) was delivered to the monomer through the branch of the monomer solution pipeline by a delivery pump to initiate a polymerization reaction. The reaction solution is sprayed onto the reaction bed to obtain a hydrogel polymer.

Embodiment 1

[0150] Get 5000g hydrogel-like polymer (water content: 50% by weight) in manufacturing example 1, add 1250g water on the surface of the gel, after the gel completely absorbs the water, use a meat grinder (the hole diameter of the orifice plate is 4.5 mm, with a porosity of 34.4%), it was broken twice to prepare a fine particle gel. Add 100g concentration of sucrose stearate (S-770, Mitsubishi Chemical) suspension on the fine particle gel surface atomization, after mixing uniformly, then use a meat grinder (orifice opening diameter is 4.5mm) mm, with a porosity of 34.4%) to break it into fine-grained gels. Spread the crushed gel particles on a wire mesh for drying at a drying temperature of 140° C. for 45 minutes to obtain a cross-linked polymer. The dried cross-linked polymer is finely granulated by using a crushing machine, and sieved to obtain water-absorbent resin particles 1 with a particle size of less than 150 microns and containing a surface modifier.

[0151] Get 500...

Embodiment 2

[0158] Change the drying temperature of the gel in Example 1 to 130°C for 60 minutes, and other operations are the same as in Example 1 to obtain a water-absorbent resin 2-1 with a particle size of 300-425 microns, a moisture content of 3.5% by weight, and a CRC It is 43.2g / g.

[0159] Then the water-absorbent resin 2-1 was subjected to the same surface cross-linking and additive process as in Example 1 to obtain a water-absorbing agent 2 with a CRC of 32.3g / g, a salt water absorption of 28.5g / g in one minute, and pure water in one minute. The amount was 130.2 g / g.

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Abstract

A method for producing a polyacrylic acid-based water-absorbent resin comprises the steps of: obtaining an aqueous solution containing an acrylic monomer and a crosslinking agent; carrying out polymerization reaction on an aqueous solution containing an acrylic monomer and a cross-linking agent to obtain a gel-like cross-linked polymer of which the water content is 30-80 wt%;mixing a water-containing gel-like cross-linked polymer with polyacrylic acid water-absorbent resin particles with the number-average particle size of 1-200 microns in a polymerization reaction process or after the polymerization reaction is finished, and crushing the mixture into gel particles with the number-average particle size of 50-1mm; heating and drying the crushed gel particles by adopting a heating medium with the temperature of 80-170 DEG C to obtain a cross-linked polymer with the water content of 0.1-10wt%; and carrying out fine granulation on the dried cross-linked polymer, and screening the granulesto prepare the water-absorbent resin particles. According to the present invention, a method for efficiently producing a water-absorbent resin having a low liquid reflux amount and a high liquid absorption rate can be provided, and a water-absorbent resin having a high liquid absorption rate can be obtained.

Description

technical field [0001] The present invention relates to a water-absorbent resin having a high liquid absorption rate and a method for producing the same. Specifically suitable for absorbent articles, such as: paper diapers (disposable diapers), sanitary napkins, incontinence pads, mattresses, pet pads, wound care materials, building materials, soil water retention materials and other products. Background technique [0002] Super absorbent polymer (SAP), also known as super absorbent resin, is a cross-linked polymer containing strong hydrophilic groups that is insoluble in water but can absorb tens, hundreds or even thousands of times its own weight. polymer. It is known that superabsorbent resins include partially neutralized cross-linked polyacrylic acid, hydrolyzate of starch-acrylic acid graft polymer, saponified product of vinyl acetate-acrylate copolymer, cross-linked acrylonitrile copolymer, propylene Cross-linked body of amide copolymer, cross-linked body of cationi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/12C08L33/02
CPCC08J3/12C08J3/245C08J2333/02
Inventor 顾子旭胡健徐亮徐科峰杭渊
Owner 宜兴丹森科技有限公司
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