Method for preparing super absorbent resin

Abstract

The invention discloses a method for preparing a super absorbent resin. The method comprises the following steps: 1) dissolving a hydrophilic linear polymer in water, adding a monomer A, a crosslinking agent A and an initiator A, stirring for completely dissolving, thus obtaining a reaction solution A; 2) mixing acrylic acid and a sodium hydroxide solution, adding fumed silica, mixing, filtering for removing a polymerization inhibitor, thus obtaining a monomer solution B; 3) dissolving a crosslinking agent B and an initiator B in the monomer solution B to obtain a reaction solution B, and adding interpenetrating polymer network gel into the reaction solution B, so that the gel is fully swelled, heated and reacted, thus obtaining interpenetrating polymer network gel B, drying to constant weight, crushing, grinding and screening to obtain an initial super absorbent resin product; and 4) performing surface treatment on the initial super absorbent resin product by using a surface treatment solution, thus obtaining the final product. The product has high absorption speed, high water retaining capacity, high pressurized absorption amount and other performances and can be applied to sanitary towels and other hygienic products.

Description

technical field [0001] The invention relates to a preparation method of superabsorbent resin. Background technique [0002] Superabsorbent resin refers to a cross-linked polymer network that is insoluble in water but can absorb tens or even thousands of times its own weight in water. It is widely used in sanitary materials such as women's sanitary napkins and baby diapers, drought resistance and water retention, agriculture, forestry and gardening, and biomedicine. And other fields, with the rapid development of science and technology and the continuous improvement of people's living standards, its application fields are constantly expanding, and gradually penetrate into various fields of industrial production and people's lives. According to the composition of superabsorbent resin, there are mainly cellulose superabsorbent resin, starch grafted superabsorbent resin, polyacrylic acid superabsorbent resin, polyacrylamide superabsorbent resin, polyvinyl alcohol superabsorbent ...

AI Technical Summary

Problems solved by technology

The preparation methods of acrylic superabsorbent resin mainly include inverse suspension method and solution polymerization method. The inverse suspension method directly obtains particle products, which is easy to dry and has excellent water absorption performance. It has always been the goal pursued by superabsorbent resin manufacturers, but Due to the shortcomings of this method, such as the need to use organic solvents, complex production processes, and difficulty in realizing continuous production, it is difficult to popularize, and only a few manufacturers use this method.

The solution polymerization method is relatively easy to realize, and it is currently the production method of superabsorbent resins adopted by most manufacturers, but the performance of the products obtained by the solution polymerization method is difficult to compare with the products of the reverse suspension method, especially the absorption required by hygienic materials. Speed, pressure absorption and other properties often require post-processing to meet the requirements

In addition, due to the strong hydrophilicity of acrylic acid, drying has become a major technical problem in the preparation of polyacrylic acid superabsorbent resin by solution polymerization.