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Manufacturing method of water absorption resin with high liquid absorption rate

A manufacturing method and water absorption technology, applied in the field of absorbent articles, can solve the problems of increasing production cost, affecting the liquid absorption performance of products, affecting the surface tension of resin, etc., and achieving the effect of high-speed liquid absorption rate

Inactive Publication Date: 2018-06-19
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

[0015] These technologies have improved the water absorption speed of the resin to a certain extent, but in the actual production process, it is necessary to use azo compounds, carbonate compounds, peroxides and other chemical substances that can generate gas as additives, or to add them to the monomer solution. Continuously blowing gas into the medium, which brings about the problem of increased production costs
In addition, in order to obtain a water-absorbent resin with better foaming effect, it is often necessary to add a surfactant to the polymerization system to stabilize the size of the bubbles, which will lead to a decrease in the surface tension of the water-absorbent resin during use and inhibit the liquid absorption characteristics of the product.
Adding surfactants to the polymerization system will affect the surface tension of the resin, thereby affecting the liquid absorption performance of the product

Method used

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  • Manufacturing method of water absorption resin with high liquid absorption rate

Examples

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Effect test

manufacture example 1

[0126] 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 44.0wt%, 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 wt% was transported at the branch of the monomer solution pipeline, and the flow rate was 72 kg / h. In addition, a 4wt% sodium persulfate aqueous solution (flow rate: 60kg / 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

[0128] Take the hydrogel-like polymer (water content~50wt%) in the manufacture example 1, adopt the meat grinder (orifice hole diameter is 6 millimeters) to repeat its crushing twice, obtain the fine particle gel with rough surface, have rough The proportion of fine particle gel on the surface is greater than 90%. Spread the gel particles on a wire mesh for drying at a drying temperature of 190° C. for 40 minutes to obtain a cross-linked polymer. The dried cross-linked polymer was granulated by a crushing machine and sieved to obtain a particle size of 300-425 microns, a moisture content of 3.2 wt%, a CRC of 41.3 g / g, and a vortex absorption rate of 39 sec / g water-absorbent resin.

Embodiment 2

[0130] Take the hydrogel-like polymer (water content ~ 50wt%) in Manufacturing Example 1, and use a meat grinder (the hole diameter of the orifice plate is 6 mm) to repeatedly crush it three times to obtain a fine-grained gel with a rough surface. The proportion of fine particle gel is greater than 90%. Spread the gel particles on a wire mesh for drying at a drying temperature of 190° C. for 40 minutes to obtain a polymer with a cross-linked structure (pore size 100-200 microns). The dried cross-linked polymer is finely granulated by a crushing machine, and sieved to obtain a particle size of 300-425 microns, a moisture content of 3.1wt%, a CRC of 40.3g / g, and a vortex absorption rate of 35sec / g water-absorbent resin.

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Abstract

The invention relates to a manufacturing method of water absorption resin with high liquid absorption rate. The manufacturing method comprises the following steps: acquiring a monomer containing unsaturated acrylic acid and a cross-linking agent aqueous solution; polymerizing the monomer containing the unsaturated acrylic acid and the cross-linking agent aqueous solution monomer to obtain a hydrogel-like cross-linked polymer; granulating and crushing the hydrogel-like cross-linked polymer in the polymerization process or after the polymerization by virtue of a high shearing and / or extrusion acting force to form gel particles, drying, crushing, and screening. The manufacturing method has the beneficial effects that a method using no additives such as a foaming agent, and a surfactant and capable of efficiently producing the water absorption resin with high liquid absorption rate is provided, and the water absorption resin with high liquid absorption rate is 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. Superabsorbent resins are now widely used in various fields such as diapers, sanitary napkins, adult incontinence products and other sanitary products and soil moisturizers. At present, water-absorbent resins are known to include partially neutralized polyacrylic acid, hydrolyzate of starch-acrylic acid graft polymer, ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08J3/075C08J3/12C08J3/24C08L51/08
CPCC08F283/065C08J3/075C08J3/12C08J3/24C08J2351/08C08F220/06
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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