Method for preparing water-absorbent resin

Abstract

The invention discloses a process for preparing absorbent resin comprising, diluting acrylic acid monomer with water to weight concentration of 40%-80%, neutralizing by alkali to 60%-90% of carboxyl mole number at 0-30 deg C, mixing with 0.01-0.1% of crosslinking agent and 0.1-1% of initiating agent of the weight of acrylic acid to obtain aqueous solution, mixing non / negative ion oligomer as surface active agent accounting to 5-20% of acrylic acid weight with petroleum base hydrocarbon solvent accounting to 400-500% of acrylic acid weight, so as to obtain organic phase solution, at 50-90 deg. C, polymerizing through radical polymerization reaction by charging aqueous solution into organic phase solution, and obtaining macromolecular absorbent resin through cooling and drying the polymer obtained in the reaction.

Description

Technical field: [0001] The invention relates to a synthesis method of cross-linked polyacrylate polymer water-absorbent resin, in particular to a preparation method of water-absorbent resin. Background technique: [0002] Polymer water-absorbing resin is a new type of functional polymer material with a wide range of uses. In terms of varieties, there are mainly two categories: grafted starch (starch and acrylic acid graft copolymer cross-linked product) and cross-linked polyacrylate. Among them, the latter is the main variety of superabsorbent resins in the current market because of its relatively simple preparation process, high stability, and resistance to mildew. [0003] 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 to graft and copolymerize corn starch and acrylonitrile, and then hydrolyze it with sodium hydroxide. Because the acrylonitrile monomer u...

AI Technical Summary

Problems solved by technology

People such as S.R.Rebre (European Patent 583177) adopt anhydrous maleic acid modified polyethylene, hydroxyethyl cellulose, polyoxyethylene nonylphenol maleate to replace traditional dispersion stabilizers; and K.M.Bailey (U.S. Patent 4777231) adopts cellulose ester or ether; Kobayashi Takashi (Japanese Patent 61209201) adopts octadecyl phosphate monoester and hexadecyl phosphate monoester as suspension stabilizers, but all there is the problem that the effect of absorbing salt water is not ideal, thus This has led to limitations in the application of the superabsorbent resin synthesized by the reverse-phase polymerization method, and some inventions still have problems such as sticking to the pot, climbing poles, and unstable reaction systems.