| 摘要 |
PURPOSE:To carry out polymerization reaction smoothly without causing an abnormal reaction, and to obtain easily the titled material containing a highly water-absorbing resin, by impregnating a porous granular material with an acrylic acid aqueous stock solution, and heating the impregnated material so that the monomer component in the aqueous solution is polymerized. CONSTITUTION:An aqueous stock solution comprising acrylic acid as a main component, forming a highly water-absorbing resin by a radical polymerization reaction, is impregnated into a porous granular material (e.g., granular pumice, etc.), and the impregnated material is heated to polymerize a monomer component in the aqueous stock solution. The polymer is further dried to give the aimed material. The aqueous stock solution is preferably prepared by blending acrylic acid as a main component with a water-soluble copolymerizable monomer such as methacrylic acid, etc., a polyfunctional monomer such as N,N'- methylenebisacrylamide, etc., and a small amount component selected from water-soluble polymers such as CMC, etc. to become a graft main polymer of acrylic acid, and a water-soluble radical initiator such as potassium persulfate, etc.
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