| abstract |
(57) [Summary] [Purpose] Gypsum cement boards, which are provided in places where buildings are likely to be exposed to moist conditions, cause mold to grow and contaminate the surface. It is susceptible to termite damage. [Constitution] In the production of a gypsum cement board containing Ca, an aqueous solution of an alkali metal salt of a phenol trihalide, particularly a phenol trihalide, such as sodium 4-bromo-2,5-dichlorophenol is added. Knead. [Effect] By the reaction with Ca ions, sedimentation products that are difficult to leaching are deposited, impart antibacterial properties to gypsum cement boards, and can protect buildings from mold and termite damage, The effect lasts well. |