Method for producing high absorptive resin

Abstract

The production method of superabsorbent resin is to obtain a viscous prepolymer through prepolymerization of reaction materials such as polymerized monomers, initiating systems, and crosslinking agents, and then further polymerize to form a gel-like solid product. Water-absorbent resin products. The initiation system adopts low temperature and high temperature compound initiation system. The water absorption rate (deionized water) of the prepared superabsorbent resin product is 500-2000g / g, the absorption rate of physiological saline (0.9% NaCl aqueous solution) is 50-150g / g, the water absorption rate is less than 10 seconds, and the hydrogel formed after the resin absorbs water Has high gel strength. The entire polymerization reaction is relatively stable, the heat release is relatively dispersed, the maximum polymerization temperature is reduced, and the operating environment is improved. The invention is more suitable for the continuous conveyor belt industrial production process.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a production process of a superabsorbent resin, in particular to a production method of a homopolymer and / or a copolymer of a cross-linked water-soluble polymerizable monomer. Background technique [0002] Superabsorbent resin is a functional polymer material with a wide range of applications. It can absorb pure water tens to thousands of times its own weight, and will not dehydrate under normal pressure. It has high water absorption rate, fast water absorption rate, and good water retention. , Even under pressure, it is not easy to dehydrate and other properties, so it is widely used in agriculture, forestry, horticulture, medicine, medical treatment, artificial organs, physiological hygiene, petroleum, chemical industry, building materials, environmental protection, food, artificial intelligence materials, sensitive materials, biochemical technology...

AI Technical Summary

Problems solved by technology

In this process, since the conveyor belt is flat, and the liquid reaction components have low viscosity and strong fluidity, only a thin layer of reaction material can be formed on the conveyor belt, and the thickness of the reaction material is only 0.5-2cm. The production capacity is limited, and the production capacity, time-volume yield and economy are relatively low

In order to reduce the fluidity of the liquid reaction material and increase its viscosity, U.S. Patent No. 4,857,610 adopts the method of adding a thickener in the liquid reaction material to increase the viscosity, but the addition of the thickener reduces the purity of the product

Moreover, due to the use of a single initiation system in the polymerization reaction in the prior art, the polymerization reaction carried out on the conveyor belt takes a long time and the maximum reaction temperature is high, even reaching above 100°C. The high temperature causes serious volatilization of the components of the monomer mixture. , which affects the operating environment, and the conversion rate of the polymerization reaction is not high, and the residual monomer content in the product is still high