| 摘要 |
PURPOSE:To obtain the title hollow board outstanding in fireproofness, light weight, safety and weatherability through low-pressure extrusion forming proc ess, by preparing, under specified conditions, a cement-contg. W/O type emulsion in which reinforcing fiber consisting of synthetic fiber has been dispersed. CONSTITUTION:First, an emulsified product is prepared by incorporating (A) a mixture of 100pts.wt. of cement (e.g. Portland cement) and 40-500pts.wt. of water with (B) 1-20wt.% of a vinyl monomer solution made up of at least one kind of water-insoluble vinyl monomer (e.g. styrene, trimethylolpropane trimethacrylate), 3-50wt.%, based on said monomer, of an inverse emulsifying agent (e.g. sorbitan monoleate) as the nonionic surfactant with a HLB of 3-6, and a polymerization initiator (e.g. benzoyl peroxide). Thence, this emulsified product is incorporated with (C) 0.3-5wt.%, based on this product, of a synthetic fiber (e.g. acrylic fiber) with an aspect ratio of 100-2,000 and length of 2-20mm to produce a cement-contg. W/O type emulsion dispersed with the reinforcing fiber. This emulsion is then fed to an extruder equipped with dies for forming hollow board to perform extrusion hollow forming at 0.1-2kg/cm<2> followed by curing and drying. |
