Production method of highly water-absorbing resin

Abstract

The invention provides a method for preparing a high hydroscopicity resin, employing a high- efficiency and continuous sifting way, which can maintain stable production and increase productivity.

Description

Manufacturing method of superabsorbent resin technical field The invention relates to a high-efficiency continuous screening method for superabsorbent resin. More specifically, it provides a method to continuously obtain high-quality super-absorbent resin by rotating or screening machines at the fastest speed during the production of super-absorbent resin, so that the process of super-absorbent resin can be more stable. Increase the production efficiency of superabsorbent resin. Background technique Superabsorbent resins have been widely used as water retention agents in agriculture or gardening, anti-dew condensation agents in building materials, materials for removing moisture from oil, or outer waterproof coating agents in cables and Hygienic products such as diapers, feminine hygiene products, disposable wipes, etc., are quite versatile. In this technical field, the component materials of known superabsorbent resins have hydrolyzed starch-acrylonitrile (hydrolyzedst...

AI Technical Summary

Problems solved by technology

In these methods, organic solvents must be used for reverse phase suspension polymerization and emulsification polymerization, but if the temperature of the polymerization cannot be effectively controlled during the process, the organic solvent will increase the temperature and pressure of the reaction system, causing a fire Phenomenon or even explosion, which threatens the safety of the plant and operation site personnel and causes environmental pollution and other problems, and the finished product also has doubts about organic solvent residues

There have been many inventions in this technical field to improve the physical properties of superabsorbent resins or to increase production efficiency, such as: adding a primary or secondary amine (Japanese Open Patent Publication Show 33 (1958)-2, 646 and Japanese Patent Publication Zhao 50(1975)-40,689), and adding sulfite and bisulfite (U.S. Patent No. 2,960,486 and No. 4,306,955) to reduce the amount of residual monomers; adding a polyvalent metal salt Class or multivalent metal hydroxides (Japanese Patent Publication 62 (1987)-0745), and adding surfactants in the gel (European Patent No. 103,058) can reduce the amount of fine powder generated in the grinding process; use multiple Alcohol is sprayed on the surface of water-absorbing resin (US Patent No. 4,734,478) for surface treatment to reduce the amount of fine powder; use organic solvents, water and polyols for surface treatment (Japanese Technical Bulletin Showa 63 (1988)-270741, Japanese patent Publication Zhao 64 (1989)-50707), the use of organic solution, water, ether (ether) compound (JP-A-2-153903) can improve the absorption rate and increase the water absorption rate under pressure; use the pipeline to pass through the stirring device, and polymerize The initiator and bridging agent are introduced into the pipeline to carry out the method of polymerization (Chinese mainland patent No. 1,498,903), using a circulating hot air drying device to improve the drying efficiency, and adjusting the gap between the grinders to increase the grinding efficiency (US Patent No. 6,641,064); but These methods of improving the physical properties or production efficiency of superabsorbent resins have no inventions or reports on improving their screening efficiency, whether it is the improvement of the polymerization reaction method, the change of the grinding conditions of the grinder, or the change of the drying method to make the drying If there is no high-efficiency screening method for creations or method inventions that improve efficiency, the performance of practical applications will be greatly reduced

Images