| 摘要 |
PURPOSE:To enable the blocking of the generation of mildew for a lone time by repeating plural times a process of holding a hydraulic calcium phosphate cement curing liquid containing water soluble saccharides with a specified pH under a dry condition at a specified temperature for a specified period of time. CONSTITUTION:Phosphoric acid, citric acid, sodium carbonate, sodium hydroxide and the like are added to a hydraulic calcium phosphate cement curing liquid to control a pH value thereof to a range of 4.0-10.0. The hydraulic liquid with this range of pH is held under a dry condition to meet treating requirements of 50-90 deg. and 30-120min. Anti-milldew treatment is performed by repeating this holding process a plurality of times. In the heating treatment under the dry condition, it is preferable that the hydraulic liquid is preserved in a dry container set to 50-90 deg.C together with a heat resisting container or others. The heating holding treatment under the dry condition is repeated two to eight times preferably. A sample of the water soluble polysaccharides to be added to the hydraulic liquid is chitin, chitosan or soluble starch or the like. |
