Anti-caking water-absorbent resin and preparation method thereof

A water-absorbing and anti-caking technology, applied in the field of anti-caking water-absorbing resin and its preparation, can solve the problems affecting product transportation, storage stability and production efficiency of sanitary products, and achieve the effect of reducing the tendency of agglomeration

Active Publication Date: 2022-04-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Scholars at home and abroad have done a lot of research on the absorption performance of water-absorbent resins, but there are few studies on the factors affecting the ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 190 g of n-heptane was added to a 2L four-neck round bottom flask equipped with a stirrer, reflux condenser, thermometer and nitrogen inlet tube. Add 0.92g sucrose fatty acid ester (Mitsubishi Chemical, S-370) therein, raise the temperature to 50°C and make it dissolve and disperse evenly at a stirring speed of 350rpm, then cool down to 30°C to obtain an oil phase for future use. Under the condition of stirring while cooling, 112g of 32% w.t. sodium hydroxide aqueous solution was added dropwise to a 500mL Erlenmeyer flask in which 92g of acrylic acid monomer and 46g of deionized water were dissolved. When the temperature dropped below 30°C, add 16 g of an aqueous solution of 0.13 g of potassium persulfate and 0.08 g of N,N'-methylenebisacrylamide was fully dissolved and mixed to obtain a solution neutralized with acrylic acid, that is, the water phase for future use.

[0040] Add half of the prepared water phase into the oil phase, and replace with nitrogen for 30 minut...

Embodiment 2

[0043] The operation of Example 1 was repeated except that the addition amount of the silicone modifier was changed to 0.2 g.

Embodiment 3

[0045] The operation of Example 1 was repeated except that the one-step silicone modifier was changed to 0.1 g γ-aminopropyltriethoxysilane (KH-550) and the moisture content of the target water-absorbent resin particles was dried to 6%.

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PUM

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Abstract

The invention provides a preparation method of an anti-caking water-absorbent resin, which comprises the following steps: a, mixing a first-stage water-phase mixed solution and an oil-phase solution, and then carrying out first-stage reversed-phase suspension polymerization reaction to obtain a first turbid liquid; b, adding an organic silicon modifier into the first suspension liquid, cooling, continuously adding the second-stage water-phase mixed liquid, and carrying out second-stage reversed-phase suspension polymerization reaction, so as to obtain a second suspension liquid; c, adding an organic silicon modifier into the second suspension liquid, continuously heating to remove most of water in the second suspension liquid, and adding a composite surface cross-linking agent to carry out surface cross-linking reaction; and d, adding silicon dioxide into the surface-crosslinked system for surface treatment, then carrying out post-treatment to remove the organic solvent, drying the obtained product to a specific water content, and screening to obtain the target water-absorbent resin. The anti-caking rate of the water-absorbent resin can be obviously improved.

Description

technical field [0001] The invention relates to an anti-caking water-absorbing resin and a preparation method thereof. Background technique [0002] Superabsorbent Polymers (SAP, Superabsorbent Polymers) is a lightly cross-linked polymer compound. Due to its strong water absorption and water retention capabilities, it is widely used in the field of sanitary materials such as diapers and sanitary napkins. Cables and optical cables are used for resistance. Water materials and water retaining agents for agriculture, forestry and gardening, etc. As water-absorbent resins for hygienic materials, polyacrylic acid partially neutralized products, starch-acrylic acid graft polymer neutralized products, starch-acrylonitrile graft polymer hydrolyzate, vinyl acetate-acrylate copolymers are known. Saponification of substances, etc. As the manufacturing method of this kind of water-absorbent resin, more than 95% adopt the aqueous solution polymerization method, and representative manufa...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/38C08F8/42C08J3/24C08L33/02C08K5/1515C08K3/36
Inventor 丁明强王刚姜云翔赵帅马磊纪学顺孙家宽
Owner WANHUA CHEM GRP CO LTD
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