A kind of high salt-resistant superabsorbent resin and its preparation method and application

Abstract

The invention discloses a high salt-resistant superabsorbent resin and its preparation method and application. The preparation method of the superabsorbent resin is as follows: S1, dissolving the basic compound in deionized water, adding acrylic acid monomer and acrylamide Monomer solution to obtain a neutralizing solution; S2, chitosan is added to the acetic acid solution, and then the initiator, n-dodecyl mercaptan, neutralizing solution, cross-linking agent and foaming agent are added successively for polymerization; S3 1. Add ethanol to make the product precipitate, filter with suction, and vacuum-dry the obtained sediment filter cake and pulverize to obtain resin particles; S4. Mix the resin particles with tricalcium phosphate powder, soak them in an organic solvent dissolved with titanium dioxide, and then dry , and then spray the surface cross-linking liquid. The superabsorbent resin of the present invention can be used in disposable diapers, and has the advantages of high absorption ratio, fast liquid absorption speed, excellent water retention performance and excellent salt resistance performance of the superabsorbent resin prepared by the method.

Description

technical field [0001] The present invention relates to the technical field of resin preparation, more particularly, it relates to a high-salt-resistance and high-water-absorbent 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 starch with polyacrylonitrile 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 polymer Acrylic acid, polyoxyethylene, polyvinyl alcohol, among which more than 80% of the super absorbent resins are polymerized from acrylic monomers. Because the cross-linked acrylic water-absorbent resin has a network structure, it c...

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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