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A kind of water-absorbent resin and preparation method thereof

A water-absorbent and resin technology, applied in the field of water-absorbent resin and its preparation, can solve the problems of insufficient water-holding capacity, inability to obtain a comprehensive performance-balanced water-absorbent resin, and lack of liquid-passing properties.

Active Publication Date: 2022-08-05
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 performance is lacking, or the water-retaining capacity is insufficient, so in the end it is impossible to obtain a water-absorbent resin with balanced comprehensive properties.

Method used

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  • A kind of water-absorbent resin and preparation method thereof
  • A kind of water-absorbent resin and preparation method thereof
  • A kind of water-absorbent resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0064] Preparation of Aqueous Epoxy Dispersion A (Step-by-Step Process):

[0065] Inject 800g of PEG6000 after melting and dehydration into the kettle, keep the temperature in the kettle at 80 ° C, then add 47 g of hexahydrophthalic anhydride into the reaction kettle, heat up to 100 ° C, react for about 3h, and sample and test the acid value to reach the theoretical value of 10mgKOH / g (by NaOH back titration measurement, the same below), inject 210g of liquid epoxy resin E20, stir evenly, add 3.5g of triphenylphosphorus catalyst, and react at 130 ° C for 3h, the test acid value is -0.25mgKOH / g and then discharge, preparation An active emulsifier is obtained. Inject 450g of molten epoxy resin E20 into the dispersion kettle, maintain the temperature in the kettle at 100°C, then add 100g of the active emulsifier prepared above and 100g of ethylene glycol dimethyl ether solvent, stir and mix at 800r / min for 20min; then cool down to 75 ℃, the lifting speed is 1200r / min, 400g of de...

Embodiment 1

[0070] Take 70g of micropowder A-1 and 30g of micropowder B-1 prepared by the two processes and mix them with 1.0g of lignocellulose, add 100g of deionized water containing 1% 1,3-propanediol, and make them swell evenly and form a hydrogel. glue particles. The granulated hydrogel particles are dried at 210° C. to a moisture content of less than 3%. Then, the dried water-absorbent resin particles are ground and sieved to obtain the original powder with a particle size distribution of 150-850 microns. Finally, water-based epoxy dispersion A, which accounts for 1.0% of the total mass of the two micro-powders, is evenly sprayed into the obtained raw powder to make it evenly dispersed and adsorbed, and dried at 130 °C for 1 hour to obtain finished products with special morphology and performance. .

Embodiment 2

[0072] Take 60g of micropowder A-2 and 40g of micropowder B-2 prepared by the two processes and mix them with 1.0g of lignocellulose, add 100g of deionized water containing 2% 1,4-butanediol to make them swell evenly and form Hydrogel particles. The granulated hydrogel particles are dried at 210° C. to a moisture content of less than 3%. Then, the dried water-absorbent resin particles are ground and sieved to obtain the original powder with a particle size distribution of 150-850 microns. Finally, water-based epoxy dispersion B, which accounts for 0.6% of the total mass of the two micro-powders, is evenly sprayed into the obtained raw powder to make it evenly dispersed and adsorbed, and dried at 130 °C for 1 hour to obtain finished products with special morphology and performance. .

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Abstract

The invention relates to a water-absorbent resin and a preparation method thereof, comprising the following steps: a. Fine powder granulation: mixing the water-absorbent resin micropowder prepared by the aqueous solution polymerization and the reversed-phase suspension polymerization process with lignocellulose in a certain proportion, adding to remove Ionized water and co-swelling agent make it swell evenly and form hydrogel particles; b. Drying: drying the hydrogel particles prepared in step a to a moisture content of less than 3%; c. The dried particles are ground and screened to obtain the original powder with a particle size distribution of 150-850 microns; d. Surface cross-linking: evenly spray the surface cross-linking treatment solution on the original powder obtained in step c, and the finished product can be obtained after heat treatment. The water-absorbent resin prepared by the invention has special morphology and excellent comprehensive performance, and has high diffusion, high pressure, high absorption speed and high water retention, and effectively recycles micropowder, reduces dust pollution and reduces production. cost.

Description

technical field [0001] The invention relates to the field of water-absorbent resins, and more particularly, to a water-absorbent resin prepared by fine powder granulation with good absorption, diffusion and conductivity properties and a preparation method thereof. Background technique [0002] Super absorbent 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. It can also be used as a water blocking material for cables and water retention for agriculture, forestry and gardening. agent, etc. [0003] Common water-absorbing 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, an aqueous solution polymerization meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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