| 摘要 |
PURPOSE:To provide the title admixture improving extrusion operation, supplying molded articles having excellent surface smoothness, etc., by blending a water-soluble or water-dispersible cellulose derivative with an acrylic polymer in a specific weight ratio. CONSTITUTION:(A) 95-50wt.% water-soluble or water-dispersible cellulose derivative (e.g. methylhydroxypropyl cellulose) is blended with (B) 5-50wt.% water-soluble or water-dispersible acrylic polymer (e.g. N,N-dimethylacrylamide/sodium acrylate copolymer) to produce an admixture for asbestos-free cement extrusion molding. In using the admixture, main components comprising a fibrous material (e.g. rock wool) not containing asbestos, cement, an aggregate (e.g. silica sand), etc., are mixed with the admixture, blended in a dry state by a mixer, etc., kneaded with water and the kneaded material is extrusion molded to produce moldings. |
