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Character description: white powder or colorless crystal. No smell. Tasteless. Decomposition of 825 to calcium oxide and carbon dioxide. Soluble in dilute acid and release carbon dioxide, insoluble in alcohol. There are two kinds of crystallization, is an orthorhombic crystal aragonite, a rhombohedral calcite crystal is six. Calcite, with irritation.
Chemical building materials on the general requirements of the carbonic acid is: with a certain degree of fineness, low oil absorption value of calcium carbonate; calcium carbonate price is not too high; good dispersion in the resin; mixed with the resin is good. The best of calcium carbonate was modified by surface modification, which was compatible with the resin, and the rheological property of the process was good. So the surface modification of heavy fine calcium carbonate is the most ideal, such as the flame retardant is better.
Chemical building materials in order to carbonic acid as the main component, the general dosage in the range of 30%~90%, the maximum can reach 95%. Therefore, calcium carbonate occupies a very important position in chemical building materials.
Soft polyvinyl chloride chemical building material products mainly have the ground coil and wallpaper, the amount of calcium carbonate is generally 44%~60%, is often mixed with heavy carbonic acid and light carbonic acid to add. Hard polyvinyl chloride chemical building materials products mainly plastic block board floor, in order to reduce costs, add a great amount, accounting for about 75% of the products. Polyethylene chemical building materials products, the amount of calcium carbonate is generally calculated by the volume of 30%~40%, if the polyethylene crosslinked foam, the amount of calcium carbonate can reach 50%~60%. Polyester resin products such as glass, steel, corrugated board, gutters and Tianlou, calcium carbonate is added in order to reduce the cost, to adjust the viscosity and improve the coating scraping processing.