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Salt-tolerant high-water-absorptivity resin and preparation method thereof

A technology of high water-absorbent resin and salt resistance, applied in the field of resin, can solve the problems of low water absorption and poor water retention of resin, and achieve the effect of improving salt resistance

Inactive Publication Date: 2016-05-25
HIGH TECH RES INST NANJING UNIV LIANYUNGANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of low resin water absorption and poor water retention in the prior art, the purpose of the present invention is to provide a salt-tolerant superabsorbent resin and its preparation method

Method used

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  • Salt-tolerant high-water-absorptivity resin and preparation method thereof
  • Salt-tolerant high-water-absorptivity resin and preparation method thereof
  • Salt-tolerant high-water-absorptivity resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 148g of 30wt% NaOH solution was added to 100g of acrylic acid (the content of the polymerization inhibitor MEHQ in acrylic acid was 180-200ppm), the neutralization temperature was controlled at 20°C, and the neutralization degree was 80mol%, so as to obtain a mixture with acrylic acid concentration of 30wt%. solution, deoxygenate the solution for 0.5h, add 0.03g of cross-linking agent N,N'-methylenebisacrylamine and 0.2g of silicon dioxide, stir evenly, add 0.2g of oxidant sodium persulfate and 0.1g of reducing agent sodium sulfite to carry out polymerization Reaction, the polymerization temperature is 70°C, and the polymerization time is 4 hours. A colorless and transparent hydrogel is obtained. The gel is dried, crushed and granulated with a meat grinder and a pulverizer, and a superabsorbent resin product of 60 to 100 meshes is obtained.

Embodiment 2

[0022] Add 139g of 30wt% NaOH solution to 100g of acrylic acid (the content of the polymerization inhibitor MEHQ in acrylic acid is 180-200ppm), control the neutralization temperature at 20°C, and the neutralization degree of 75mol%, to obtain a mixed solution with acrylic acid concentration of 30% , deoxygenate the solution for 0.5h, add 0.03g of cross-linking agent N, N'-methylenebisacrylamine and 0.1g of silicon dioxide, stir evenly, add 0.2g of oxidant sodium persulfate and 0.1g of reducing agent sodium sulfite to carry out polymerization reaction , the polymerization temperature is 75° C., and the polymerization time is 4 hours to obtain a colorless and transparent hydrogel. The gel is dried, crushed and granulated with a meat grinder and a pulverizer to obtain a 60-100-mesh superabsorbent resin product.

Embodiment 3

[0024] Add 148g of 30wt% NaOH solution to 100g of acrylic acid (the content of the polymerization inhibitor MEHQ in acrylic acid is 180-200ppm), control the neutralization temperature at 20°C, and the neutralization degree of 80mol%, to obtain a mixture with a monomer concentration of 30%. solution, deoxygenate the solution for 0.5h, add 0.02g of cross-linking agent N,N'-methylenebisacrylic acid amine and 0.3g of silicon dioxide, stir well, add 0.3g of oxidant sodium persulfate and 0.15g of reducing agent sodium sulfite to carry out polymerization Reaction, the polymerization temperature is 70°C, and the polymerization time is 4 hours. A colorless and transparent hydrogel is obtained. The gel is dried, crushed and granulated with a meat grinder and a pulverizer, and a superabsorbent resin product of 60 to 100 meshes is obtained.

[0025] Determination of (salt) water absorption

[0026] The present invention is as follows for the measuring method of (salt) water absorption cap...

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Abstract

The invention discloses a salt-tolerant high-water-absorptivity resin and a preparation method thereof. The preparation method comprises the following steps: while controlling the temperature at 10-35 DEG C, dropwisely adding a sodium hydroxide solution into an acrylic acid monomer for neutralization; adding a crosslinking agent, sufficiently stirring and uniformly mixing, carrying out solution deoxidization, adding an initiator water solution and an inorganic oxide under stirring conditions, uniformly mixing, and carrying out polymerization reaction at 60-85 DEG C to obtain a gel; and drying the gel, pulverizing, and screening to obtain the high-water-absorptivity resin. The salt tolerance of the salt-tolerant high-water-absorptivity resin is obviously enhanced on the premise of maintaining the high water absorptivity. Compared with the acrylic water-absorbing resin without any inorganic oxide, the water absorptivity in a 0.9% NaCl solution is enhanced by 10-30%. The water absorption rate is not lower than 900g / g, and the salt water absorption rate is not lower than 90g / g.

Description

technical field [0001] The invention relates to a resin, in particular to a salt-tolerant superabsorbent resin with high whiteness and a preparation method thereof. Background technique [0002] Superabsorbent resin is a new type of functional polymer material with a three-dimensional network structure. It has a high water absorption function that absorbs liquids that are hundreds to thousands of times heavier than itself. Compared with traditional water-absorbent materials, superabsorbent resins also have A unique water-retaining property. Once it absorbs water and swells to become a hydrogel, it is difficult to separate the water even if it is pressurized. Especially in sanitary products, super absorbent resin occupies a very important position. In recent years, with the increasing demand for disposable diapers and sanitary products, high water absorption has become an indispensable raw material for people's daily life, and the arrival of the aging population has opened up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/38C08F2/44C08K3/36C08K3/22
CPCC08F220/06C08F2/44C08K3/36C08F222/385
Inventor 陈林周华兰宋金文江笑
Owner HIGH TECH RES INST NANJING UNIV LIANYUNGANG