High-salt-tolerance high-water-absorption resin, preparation method and applications thereof

Abstract

The invention discloses high-salt-tolerance high-water-absorption resin, a preparation method and applications thereof. The preparation method comprises: S1, dissolving an alkaline compound in deionized water, and adding an acrylic monomer and an acrylamide monomer solution to obtain a neutralization solution; S2, adding chitosan into an acetic acid solution, sequentially adding an initiator, n-dodecyl mercaptan, the neutralization solution, a cross-linking agent and a foaming agent, and carrying out a polymerization reaction; S3, adding ethanol to precipitate the product, carrying out suctionfiltration, carrying out vacuum drying on the obtained precipitate filter cake, and crushing to obtain resin particles; and S4, mixing the resin particles and tricalcium phosphate powder, soaking inan organic solvent dissolved with titanium dioxide, drying, and spraying with a surface cross-linking solution. According to the invention, the high-salt-tolerance high-water-absorption resin can be used for disposable paper diapers, and has advantages of high absorption rate, high liquid absorption speed, excellent water retention performance and excellent salt resistance.

Description

technical field [0001] The invention relates to the technical field of resin preparation, more specifically, it relates to a high salt-tolerant superabsorbent resin and its preparation method and application. Background technique [0002] Super Absorbent Polymer (SAP) is a cross-linked network polymer containing a large number of strong polar groups. It was first prepared by Fanta et al. by grafting polyacrylonitrile with starch and then saponifying it. Since the 1960s, superabsorbent resins have been widely developed around the world. They can be divided into two categories according to raw materials. The first category is natural polymers, such as starch and cellulose; the second category is synthetic polymers, such as polymers. Acrylic acid, polyoxyethylene, and polyvinyl alcohol, among which more than 80% of super absorbent resins are polymerized from acrylic acid monomers. Because the cross-linked acrylic water-absorbing resin has a network structure, it can absorb pur...

AI Technical Summary

Problems solved by technology

[0004] However, with the introduction of non-ionic comonomers, due to the difference in polymerization activity between them and acrylic acid and alkaline neutralized acrylates, the two structural units in the product cannot be distributed according to the alignment ratio, and the structural distribution of the product is difficult to control. In addition, Since the polymerization process and the cross-linking process are carried out at the same time, the cross-linking reaction affects the polymerization reaction, the heat of the polymerization process is large, the polymer fluidity is poor, it is difficult to stir, and it is difficult to obtain a higher polymer molecular weight. Therefore, by introducing non-ionic hydrophilic monomers It is difficult to control the water absorption performance of the superabsorbent resin prepared by the introduction of the body, and the effect of improving the salt resistance of the water absorbent resin is not obvious