| 摘要 |
PURPOSE:To obtain the subject mortar composition effective in preventing the generation of stain from a wood part when laminated to plywood, etc., by adding a specific amount of one or more substances selected from oxo acid, hydroxy acid and saturated dicarboxylic acid to a mortar. CONSTITUTION:The objective mortar composition for preventing the generation of stain from a wood part is produced by adding 0.3-3 pts.wt. (based on cement in the mortar) of one or more kinds of organic acids selected from oxo acid (e.g. orthoboric acid), hydroxy acid (e.g. citric acid) and saturated dicarboxylic acid (e.g. succinic acid) as a stain-generation preventing agent to a mortar. The composition may be further incorporated with 10-25wt.% (in terms of solid based on the mortar) of a polymer dispersion (e.g. polyacrylic acid ester). A rough coating material for building free from generation of stain can be produced by laminating the obtained mortar composition to a building base material having a wood part such as plywood. |
