Preparation method of super absorbent resin for sanitary material

Abstract

The invention discloses a preparation method of super absorbent resin for a sanitary material. The preparation method comprises the following steps: (1) adding 20-80 parts by weight of a polymerized monomer, 0.02-5 parts by weight of a secondary monomer, 0.001-1 part by weight of a crosslinking agent and 0.01-5 parts by weight of other auxiliaries into a container to obtain to-be-polymerized feed liquid, mixing uniformly the feed liquid and filling in a sealed plastic bag, exhausting gas out of the plastic bag, putting the plastic bag on a tray, enabling the plastic bag to pass through electron beams for irradiation at a constant speed, wherein the feed liquid quickly expands to form gel; (2) cutting the gel cooled in the step (1) into gel particles with the diameter being less than 3mm; (3) drying the gel particles obtained in the step (2) to small solid particles at 50-180 DEG C; (4) screening the solid particles obtained in the step (3) and selecting 20-150-mesh semiproduct solid particles; (5) adding 100 parts by weight of semiproduct solid particles obtained in the step (4) as a base material into surface crosslinking liquid to react; and (6) reducing the temperature of the material after surface treatment to less than 60 DEG C, spraying, adding 1-5 parts by weight of a water agent and uniformly mixing to obtain the super absorbent resin for the sanitary material.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin for hygienic materials, and belongs to the technical field of irradiation processing. Background technique [0002] High-performance water-absorbing resin refers to a functional polymer synthetic material whose water absorption rate is dozens or even thousands of times its own mass. Water conservation 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 protection Fire extinguishing and many other fields, and with the development of science and technology, its application range will be wider. [0003] In the polymerization reaction of synthesizing high-performance water-absorbent resins, most of the dominant synthetic routes and preparation processes are aqueous solut...

AI Technical Summary

Problems solved by technology

[0004]The method of reverse suspension solution polymerization produces superabsorbent resin, which can obtain excellent product quality, but there are outstanding problems affecting its development: the use of a large amount of organic solvents , the process must be processed and recycled. Due to the flammability and explosion of the solvent, the operation of the process equipment is required to be very strict, and there is a danger of explosion and pollution to the environment.

The dose rate of γ-rays produced by 60Co is low, and there are also great risks in safety. Therefore, the above disadvantages can be overcome by using high-energy electron beam irradiation

[0018] The radiation of microwave, ultraviolet light, and radioactive source [Co60] triggers the polymerization reaction of free radicals of monomers. Because the irradiation time required to reach a certain dose is long, the reaction efficiency is low , the heat of reaction is low and the polymerization is incomplete, the residual monomer is more, and the final physical properties are poor

There are also effects of dose rate changes on product performance in the process, etc.

[0019] To sum up, when the above-mentioned polymerization method initiates free radical polymerization of monomers, either a chemical initiator and heating and temperature control are required, or a long period of radiation is required. According to the accumulation of dose, there are many deficiencies in the reaction rate or physical property control