| 摘要 |
PURPOSE:To obtain excellent water repellency and water proofing property and to obtain smooth surface without causing dimensional changes during drying or absorbing watery by mixing a specified compd., binder for extrusion molding with cement mortar. CONSTITUTION:An admixture is obtd. by mixing 0.01-5 pts.wt. of modified organopolysiloxane expressed by formula I and 0.2-2 pts.wt. of binder for extrusion molding consisting of alkylcellulose and/or hydroxyalkyl alkylcellulose. Then, this admixture, mortar cement, and aggregate of fibers having 1-20mum diameter and 1-10mm length by <=15 pts.wt. are mixed to produce the cement compsn. for extrusion molding. In formula I, (m) is 0 or an integer and at least one of R in one molecule is a polyoxyalkylene group expressed by formula II. Other R in the molecule is hydrocarbon group or hydrocarbon halide group. In formula II, (a) is 0 to 4, (b) and (c) are integers >0, R<1> is H or univalent hydrocarbon group of 1-15C, or acyl group. |
