Water absorbing resin

Abstract

The invention belongs to the field of water absorbing high molecular materials, and particularly relates to a water absorbing resin. The water absorbing resin mainly comprises the following componentsin portion by weight: 32 to 42 portions of polyacrylamide, 54 to 64 portions of acrylic acid, 3 to 13 portions of peanut oil, and 15 to 25 portions of sodium carbonate. The water absorbing resin is formed by cross linking the acrylic acid and acrylamide, is spherical or elliptical after absorbing water, is glittering and translucent, has high resilience and advanced process production, adopts worldwide advanced suspension production, and has strong gelling property and water absorbing property.

Description

technical field [0001] The invention belongs to the field of water-absorbing polymer materials, in particular to a water-absorbing resin. Background technique [0002] Water-absorbing resin is a kind of polymer material that can absorb water dozens or even thousands of times its own weight. In terms of varieties, there are two main categories: grafted starch (starch and acrylic acid graft copolymer cross-linked product) and cross-linked polyacrylate. Among them, cross-linked polyacrylate has simple preparation process and high stability, and is currently the main variety of water-absorbent resin on the market. The water-absorbing resin was first successfully developed by the Northern Research Institute of the United States Department of Agriculture in 1969. The method was graft copolymerization of corn starch and acrylonitrile, and then hydrolyzed with sodium hydroxide. Since acrylonitrile is a highly toxic monomer, acrylic acid was used instead of acrylonitrile in Japan, ...

AI Technical Summary

Problems solved by technology

[0004] So far, although there are various reports on water-absorbent resins, the effects are not satisfactory.

The water absorption rate of the water-absorbent resin produced by ordinary formula is relatively slow, reducing its particle size can increase the water absorption rate of the water-absorbent resin, but when the particle size of the resin is too small, the too fine particles cannot be well dispersed in water, and the outer surface has absorbed water and swelled , the inside is still anhydrous powder, but the water absorption rate is reduced

In addition, the gel strength formed by the water-absorbent resin after absorbing water is low, and it is easily broken or deformed during use, resulting in a decrease in the liquid retention characteristics of the product and an increase in the amount of liquid leakage, which reduces its application.