| 摘要 |
PURPOSE:To obtain a formed article having excellent mechanical strength and heat-insulation property as well as hydrophobicity, by adding an acrylstyrene emulsion, starch and water to hydrated calcium silicate, forming the obtained aqueous slurry and drying the product. CONSTITUTION:The objective formed calcium silicate is produced by forming an aqueous slurry composed of 100pts.wt. of hydrated calcium silicate, 5-30pts. wt. (solid basis) of an acrylstyrene emulsion, 0.5-15pts.wt. of starch and a proper amount of water and drying the formed product. The acrylstyrene emulsion used in the above process is preferably the one obtained by copolymerizing a monomer mixture containing 1-30wt.% (solid basis) of a monomer having carboxyl group with a monomer forming a base of the acrylstyrene emulsion. A monomer having phosphoric acid group or sulfonic acid group may be used in place of the monomer having carboxyl group. |
