Preparation method of super absorbent resin resistant to moisture absorption and caking

A high water-absorbent resin and anti-moisture absorption technology, which is applied in the field of polymerized functional polymer chemical additives, can solve the problems of uneven surface crosslinking, unstable product quality, poor liquid permeability, etc. Solve the effect of product quality fluctuation and not easy to gel blocking

Active Publication Date: 2017-12-15
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems of unstable product quality, uneven surface crosslinking, hygroscopic agglomeration, low strength, poor liquid-through performance and low absorption speed in existing superabsorbent resins.

Method used

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  • Preparation method of super absorbent resin resistant to moisture absorption and caking
  • Preparation method of super absorbent resin resistant to moisture absorption and caking
  • Preparation method of super absorbent resin resistant to moisture absorption and caking

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preparation example Construction

[0037] The invention provides a method for preparing a superabsorbent resin resistant to moisture absorption and caking, comprising the following steps:

[0038] (1) After mixing acrylic acid, water and a crosslinking agent, pass nitrogen to remove oxygen, then add an initiator until the temperature does not rise, and then keep warm to obtain the product;

[0039] (2) Process the product obtained to obtain resin particles;

[0040] (3) Add reinforcing agent powder to the resin particles and mix evenly, then add surface crosslinking liquid and stir evenly, keep warm at 120-200°C to obtain the superabsorbent resin;

[0041] Wherein, the reinforcing agent is selected from one or more of calcium oxide, kaolin, silicon dioxide, aluminum sulfate, aluminum oxide, calcium carbonate, and magnesium carbonate.

[0042] The present invention utilizes intermolecular van der Waals force to firstly adsorb specific reinforcing agent powder on the surface of superabsorbent resin particles tha...

Embodiment 1

[0063] The parts by weight of raw materials used are: 220 parts of acrylic acid, 780 parts of deionized water, 1 part of tetraallyloxyethane, 0.3 parts of potassium persulfate, 0.8 parts of ascorbic acid, 10 parts of ethylene glycol, 8 parts of butanediol diglycidyl ether 3 parts, 3 parts of aluminum sulfate, 2 parts of silicon dioxide.

[0064] Concrete preparation process is as follows:

[0065] S11. Add acrylic acid, deionized water, and crosslinking agent into the reactor, and blow high-purity nitrogen into the reactor to control the oxygen content in the system to not exceed 1ppm. Add potassium persulfate and ascorbic acid to initiate polymerization at 21°C, and the temperature will no longer rise. To complete the reaction, the peak temperature is controlled at 85-90° C., and the temperature is kept at 80-85° C. for 2 hours to obtain a resin colloid.

[0066] S12. Granulate the obtained resin colloid, then add 88 parts by weight of sodium hydroxide to the obtained resin ...

Embodiment 2

[0069] The parts by weight of raw materials used are: 250 parts of acrylic acid, 750 parts of deionized water, 1.2 parts of trimethylolpropane triacrylate, 0.34 parts of potassium persulfate, 0.9 parts of ascorbic acid, 20 parts of glycerol, polyglycerol polyglycidyl ether 7 parts, 2 parts alumina, 1 part kaolin.

[0070] Concrete preparation process is as follows:

[0071] S21. Add acrylic acid, deionized water, and a crosslinking agent into the reactor, and blow high-purity nitrogen into the reactor to control the oxygen content in the system to no higher than 1ppm. Add potassium persulfate and ascorbic acid to initiate polymerization at 25°C, and the temperature will no longer rise. To complete the reaction, the peak temperature is controlled at 85-90° C., and the temperature is kept at 85-90° C. for 2 hours to obtain a resin colloid.

[0072] S22, granulate the resin colloid obtained by the reaction, add 100 parts by weight of sodium hydroxide to the resin colloid particl...

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Abstract

The invention relates to a preparation method of super absorbent resin resistant to moisture absorption and caking. The preparation method comprises the following steps: introducing nitrogen to removal oxygen after mixing acrylic acid, water and a cross-linking agent, then adding an initiating agent until the temperature is not increased, and then preserving the temperature to obtain a product; treating the obtained product to obtain resin particles; adding reinforcing agent powder into the resin particles to be mixed uniformly, then adding a surface cross-linking solution to be stirred uniformly, preserving the temperature at the temperature of 120 to 200 DEG C to obtain the super absorbent resin, wherein the reinforcing agent is selected from one or more of calcium oxide, kaoline, silica, aluminum sulfate, aluminum oxide, calcium carbonate and magnesium carbonate. The super absorbent resin synthesized by using the method is highly uniform in surface cross-linking degree and high in strength, is not easy for moisture absorption and caking in air, can be stored for longer time, is unlikely to cause gel blockage after liquid absorption, and has good liquid flowing performance and conduction performance.

Description

technical field [0001] The invention relates to the technical field of polymerized functional polymer chemical additives, in particular to a preparation method of a superabsorbent resin that resists moisture absorption and agglomeration. Background technique [0002] Superabsorbent resin is a widely used functional polymer material. Currently, the synthesized superabsorbent resin cannot be directly applied to feminine hygiene products and baby diapers. Because the surface of the superabsorbent resin particles is easy to bond after contacting the liquid, the granular polymer forms agglomerates, causing the gel to block and hindering the further infiltration and absorption of the liquid. Moreover, superabsorbent resin particles without surface crosslinking have poor gel strength, low pressure absorption, and are easy to agglomerate after absorbing moisture in the air, which is not conducive to long-term storage. Later, people improved the existing production process by perfor...

Claims

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Application Information

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IPC IPC(8): C08F120/06C08J3/24C08L33/02C08K13/02C08K3/30C08K3/36C08K5/053C08K5/1515C08K3/22C08K3/34
Inventor 荣敏杰李振许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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