초록 ▼

Mag-oxy cements are made by either molding or heat treating after molding at elevated temperatures. The products are made utilizing colloidal silica and/or phosphates and the products are made by either molding or by heat treating after molding at elevated temperatures. The products treated at 250°F

Mag-oxy cements are made by either molding or heat treating after molding at elevated temperatures. The products are made utilizing colloidal silica and/or phosphates and the products are made by either molding or by heat treating after molding at elevated temperatures. The products treated at 250°F. show considerably less solubility particularly where both phosphates and silicates are present in which case the weight loss based on the reactables may be as low as approximately 2 percent. When heat treated at 300°F., there is no weight loss in practically all cases; but a pickup in weight occurs indicating an additional hydration. Sheet molding compounds are also made by processes which provide a deficiency of water of hydration.

대표청구항

A magnesium oxide cement modified by having sufficient orthophosphate present and incorporated into its structure by heating at temperatures above approximately 250°F. so that it has a solubility of less than 2 percent in boiling water.

A magnesium oxide cement modified by having sufficient orthophosphate present and incorporated into its structure by heating at temperatures above approximately 250°F. so that it has a solubility of less than 2 percent in boiling water.