Water-absorbent resin and production method thereof

A manufacturing method and water-absorbing technology, applied in the direction of coating, etc., can solve the problems of lower apparent density, affect the surface tension of resin, and decrease the impact resistance of liquid-permeable resin, and achieve the effect of high-speed liquid absorption rate

Inactive Publication Date: 2018-03-23
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 some extent, but in the actual production process, the permeability of the liquid or the impact resistance of the resin will decrease, the apparent density will decrease, and it will be easy to produce, transport or use. Generate fine powder or dust and other problems
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.
The technology disclosed in said patent improves the liquid absorption rate of the water-absorbent resin, but it is still insufficient
[0016] Adding surfactants to the polymerization system will affect the surface tension of the resin, thereby affecting the liquid absorption performance of the product
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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  • Water-absorbent resin and production method thereof
  • Water-absorbent resin and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0204] Adopt high-speed emulsifying machine (rotating speed 6000r / min) that 3.24 gram concentrations are 6.17wt% azobisisobutylamidine hydrochloride aqueous solution and 12.97 gram concentrations are 42.0wt% acetic acid / sodium acetate (acetic acid / sodium acetate ml ratio is 2.7 / 7.3) The mixed solution was mixed at room temperature, and the mass ratio of azobisisobutylamidine hydrochloride to acetic acid / sodium acetate was 1:27.23 to obtain a foaming agent particle dispersion (particle size<45 microns), which was ready for use. 200 grams of acrylic acid monomer, 92 grams of deionized water and 244 grams of 32 wt % sodium hydroxide aqueous solution were weighed in sequence and added to a beaker with a volume of 2 liters, stirred evenly and set aside. Subsequently, 4.66 g of polyethylene glycol diacrylate (molecular weight: 522) with a concentration of 11.3 wt % was weighed and added to the partially neutralized monomer solution, and stirred evenly. After the monomer solution was...

Embodiment 2

[0211] 3.24 gram concentration is 6.17wt% azobisisobutylamidine hydrochloride aqueous solution and 12.97 gram concentration is 42.0wt% acetic acid / sodium acetate (acetic acid / sodium acetate ml ratio is 2.7 / 7.3) mixed solution by mechanical stirring Mix at room temperature, the mass ratio of azobisisobutylamidine hydrochloride to acetic acid / sodium acetate is 1:27.23, and a foaming agent particle dispersion (particle diameter<45 microns) is obtained, which is ready for use. 200 grams of acrylic acid monomer, 92 grams of deionized water and 244 grams of 32 wt % sodium hydroxide aqueous solution were weighed in sequence and added to a beaker with a volume of 2 liters, stirred evenly and set aside. Subsequently, 4.66 g of polyethylene glycol diacrylate (molecular weight: 522) with a concentration of 11.3 wt % was weighed and added to the partially neutralized monomer solution, and stirred evenly. After the monomer solution was heated to 94°C, the foaming agent particle dispersion ...

Embodiment 3

[0214] 3.24 gram concentration is 6.17wt% azobisisobutylamidine hydrochloride aqueous solution and 12.97 gram concentration is 42.0wt% acetic acid / sodium acetate (acetic acid / sodium acetate ml ratio is 2.7 / 7.3) mixed solution by mechanical stirring After mixing evenly at room temperature, the solution was allowed to stand, and the mass ratio of azobisisobutyramide hydrochloride to acetic acid / sodium acetate was 1:27.23 to obtain a foaming agent particle dispersion (particle diameter<45 microns), and other processes Same as Example 2. A granular water-absorbent resin with a porous structure having a particle diameter of 300-425 microns, a CRC of 43.5 g / g, and a whirlpool absorption rate of 41 sec / g was obtained, and the pore diameter was 50-200 microns.

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Abstract

The invention discloses water-absorbent resin and a production method thereof. The production method comprises the following steps: obtaining an aqueous solution containing an unsaturated acrylic acidmonomer and a cross-linking agent; mixing a foaming agent solution with a weak acid and / or weak acid salt solution to prepare foaming agent particle dispersion liquid, wherein the foaming agent solution is a compound solution containing primary ammonia, secondary ammonia, tertiary ammonia or quaternary ammonium groups; the weak acid and / or weak acid salt solution is one of a weak acid solution, aweak acid salt solution or a mixed solution of weak acid and weak acid salt; a mass ratio of foaming agent components to weak acid / weak acid salt components ranges from (10 : 1) to (1 : 5000); the average particle size of foaming agent particles in the foaming agent particle dispersion liquid is 0.1 to 900 micrometers. The production method has the beneficial effects that the method which does not affect the imbibing characteristic of the water-absorbent resin and can efficiently produce the water-absorbent resin with a high imbibing rate can be provided; in addition, the water-absorbent resin with the high imbibing rate and a composition thereof are obtained.

Description

technical field [0001] The present invention relates to a water-absorbent resin and its production method. 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, and have rapid liquid absorption performance Water absorbent resin and its production method. 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, hyd...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/32C08F220/06C08F222/20C08K3/36
CPCC08F220/06C08J9/008C08J9/32C08J9/36C08J2203/22C08J2333/02C08K3/36C08K2201/011C08F222/1063
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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