Method for preparing water-absorbing resin by ultraviolet and gamma-ray radiation ionization technique

Abstract

The invention relates to a preparation method of a water-absorbing resin, particularly a method for preparing a water-absorbing resin by an ultraviolet and gamma-ray radiation ionization technique. The method comprises the following steps: 1) neutralizing acrylic acid monomer with an alkali solution to a neutralization degree of 60-90%, adding functional monomer which accounts for 0.2-40 wt% of the acrylic acid monomer to prepare a neutralized solution of which the mass percentage of the total monomers is 30-60%, and adding into a transparent reaction vessel; 2) irradiating the neutralized solution in the transparent neutralized solution under an ultraviolet light source so that the neutralized solution is subjected to polymerization reaction to generate an elastogel; 3) putting the elastogel obtained in the step 2) in a gamma-ray nuclear radiation device of which the radiation dose rate is 0.3-10 kGy / h, and carrying out dynamic irradiation with a delivery system until the irradiation dose reaches 3-20 kGy; and 4) after carrying out crushing, drying, pulverization and screening on the elastogel obtained in the step 3), carrying out dispersity and permeability surface treatment with a surface treating agent to obtain the water-absorbing resin.

Description

technical field [0001] The invention relates to a method for preparing a water-absorbing resin, in particular to an aqueous solution of acrylic acid, acrylate, and functional comonomers, which is prepared by solution polymerization under the chemical effects of ultraviolet light source and γ-ray nuclear radiation ionization chemical effect Resin method. Background technique [0002] Superabsorbent resin refers to functional polymer synthetic materials whose water absorption rate is dozens or even thousands of times its own mass. It is because of its excellent water absorption and gel expansion properties that it is widely used in agriculture, forestry and gardening to save water in soil. Water retention and soil conditioning, medical and sanitary products (such as sanitary napkins, diapers, sanitary care mattresses, etc.), flood control and water blocking, building moisturizing and water sealing materials, cable water blocking, food preservation, daily chemicals, fire exting...

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of superabsorbent resin mostly adopts the thermal polymerization method of adding initiator and crosslinking agent, and the polymerization of superabsorbent resin is a chemical reaction process from liquid to gel solid state. Due to the difficulty of stirring and heat transfer in the later stage, the product performance is difficult. Stablize

Although there are reports of independent ultraviolet polymerization and independent γ-ray radiation polymerization technology, both of them need to add initiator and crosslinking agent, and lack the supplement of post-surface treatment technology, the liquid permeability and dispersibility of the product are poor, and it is difficult to meet the practical application requirements. Demand for comprehensive practical performance of products

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