Water-absorbent resin and preparation method thereof

A water-absorbing and resin technology, applied in the field of water-absorbing resin and its preparation, can solve the problems of not being able to obtain a water-absorbing resin with comprehensive performance balance, lack of liquid-passing performance, insufficient water-holding capacity, etc., and achieve excellent comprehensive performance, reduce dust pollution, The effect of high water retention

Active Publication Date: 2020-09-04
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fine powder granulation methods are only aimed at water-absorbent resin powder with a single shape and performance. Either the liquid-through performanc

Method used

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  • Water-absorbent resin and preparation method thereof
  • Water-absorbent resin and preparation method thereof
  • Water-absorbent resin and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0064] Preparation of aqueous epoxy dispersion A (step-by-step method):

[0065] Pour 800g of melted and dehydrated PEG6000 into the kettle, keep the temperature in the kettle at 80°C, then add 47g of hexahydrophthalic anhydride into the reaction kettle, raise the temperature to 100°C, react for about 3 hours, and take samples to test that the acid value reaches the theoretical value of 10mgKOH / g (by After NaOH back titration measurement, the same below), inject 210g of liquid epoxy resin E20, stir evenly, add 3.5g of triphenylphosphorus catalyst, react at a constant temperature of 130°C for 3 hours, and discharge the material after testing the acid value of -0.25mgKOH / g to prepare Reactive emulsifiers are obtained. Pour 450g of molten epoxy resin E20 into the dispersion kettle, maintain the temperature in the kettle at 100°C, then add 100g of the above-prepared active emulsifier and 100g of ethylene glycol dimethyl ether solvent, stir and mix at 800r / min for 20min; then cool ...

Embodiment 1

[0070] Mix 70g of micropowder A-1 and 30g of micropowder B-1 prepared by the two processes with 1.0g of lignocellulose, add 100g of deionized water containing 1% 1,3-propanediol to make it evenly swell and form a hydrogel Glue particles. The granulated hydrogel particles are dried at 210°C until the moisture content is lower than 3%. Then, the dried water-absorbing resin particles are ground and sieved to obtain a raw powder with a particle size distribution of 150-850 microns. Finally, spray evenly water-based epoxy dispersion A which accounts for 1.0% of the total mass of the two micropowders to the obtained raw powder to make it uniformly dispersed and adsorbed, and dry at 130°C for 1 hour to obtain a finished product with special appearance and properties .

Embodiment 2

[0072] Mix 60g of micropowder A-2 and 40g of micropowder B-2 prepared by the two processes with 1.0g of lignocellulose, add 100g of deionized water containing 2% of 1,4-butanediol to make it evenly swell and form Hydrogel particles. The granulated hydrogel particles are dried at 210°C until the moisture content is lower than 3%. Then, the dried water-absorbing resin particles are ground and sieved to obtain a raw powder with a particle size distribution of 150-850 microns. Finally, evenly spray 0.6% of the total mass of the two micropowders into the obtained raw powder with water-based epoxy dispersion B to make it uniformly dispersed and adsorbed, and dry at 130°C for 1 hour to obtain a finished product with special appearance and properties .

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Abstract

The invention relates to water-absorbent resin and a preparation method thereof. The preparation method comprises the following steps: a, fine powder granulation: mixing water-absorbent resin micro-powder prepared by aqueous solution polymerization and reversed-phase suspension polymerization processes with lignocellulose according to a certain proportion, and adding deionized water and a swellingaid to uniformly swell the mixture to form hydrogel particles; b, drying: drying the hydrogel particles prepared in the step a until the moisture content is lower than 3%; c, grinding and screening:grinding and screening the dried particles prepared in the step b to obtain raw powder with the particle size distribution of 150-850 microns; and d, surface crosslinking: uniformly spraying a surfacecrosslinking treatment solution into the raw powder obtained in the step c, and carrying out heat treatment to obtain a finished product. The water-absorbent resin prepared by the method has specialmorphology and excellent comprehensive performance and has high diffusion, high pressurization, high absorption speed and high water-retaining property, micro powder is effectively recycled, dust pollution is reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of water-absorbing resins, and more specifically relates to a water-absorbing resin with good absorption, diffusion and conductivity properties prepared by fine powder granulation and a preparation method thereof. Background technique [0002] Superabsorbent resin is a polymer material with strong water absorption and water retention capacity. It is widely used in the field of sanitary materials such as diapers and sanitary napkins. agent etc. [0003] Common water-absorbent resins mainly include partial neutralization of polyacrylic acid, neutralization of starch-acrylic acid graft polymer, hydrolyzate of starch-acrylonitrile graft polymer, saponification of vinyl acetate-acrylate copolymer, etc. . [0004] As a method for producing such a water-absorbent resin, aqueous solution polymerization, reversed-phase suspension polymerization, and the like are known. The water-absorbent resins prepared by different polyme...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J3/075C08L33/02C08L97/02C09D163/02
CPCC08J3/126C08J3/075C09D163/00C08J2333/02C08J2433/02C08J2497/02C08J2463/02
Inventor 丁明强刘懿平王晓赵帅马磊纪学顺
Owner WANHUA CHEM GRP CO LTD
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