Method of oreparing starch grafting type high water absorption resin by wave polymerization

Abstract

A process for preparing starch grafted high-hydroscopicity resin in liquid phase system by wave polymerizing method includes mixing starch with water, water-bath heating while gelatinizing, neutralizing acrylic acid by sodium hydroxide, mixing it with the gelatinized starch, adding acrylamide, maleic acid, trigger, cross-linking agent, and additive, stirring, loading the mixture in cylindrical reactor, heating to trigger reaction, removing heat source, and polymerizing reaction by automatic transfer of heat waves.

Description

technical field [0001] The invention belongs to the technical field of resin preparation, and in particular provides a method for preparing starch-grafted superabsorbent resin by wave polymerization. The prepared resin has biodegradability and can be used to produce sanitary napkins, paper diapers and agricultural soil conditioners, etc. . Background technique [0002] Water-absorbent resins are widely used in personal hygiene products, soil water-retaining agents, dehydrating agents, sludge coagulants, thickeners, anti-coagulation agents, and release control agents for various chemicals. The raw materials used in the preparation of water-absorbent resins are usually ethylenically unsaturated monomers with hydrophilic groups, such as acrylic acid, acrylamide and the like. Grafting and modifying starch with vinyl monomers to prepare water-absorbent resins can not only reduce the dependence on petroleum products and reduce the cost of raw materials, but also make the prepared...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the traditional method are low monomer concentration, slow polymerization rate, low equipment utilization and production capacity; long-term feeding of nitrogen and continuous heating lead to high production costs and large energy consumption

[0005] Patents CN1431238A and CN1468866A have improved the traditional method, and prepared superabsorbent resin by high-temperature tunnel film polymerization method and one-step synthesis method respectively. The preparation process does not require nitrogen protection, but continuous heating is still required, and the energy consumption is relatively large.

[0006] Wave polymerization was first discovered by Chechilo in the former Soviet Union, and then Pojman and his colleagues in the United States conducted a lot of research on wave polymerization, developed a wave polymerization method under normal pressure, and applied it to thermochromic materials, optically functionally graded materials, In the preparation of materials such as epoxy resin curing, but there is no report on the application of wave polymerization technology to the preparation of starch-grafted superabsorbent resin at home and abroad.