Calcium stearate is a dry production process, the production process energy saving and pollution-free, high purity products, low free acid value, good lubrication. Calcium stearate is white powder, insoluble in water, cold ethanol and ether, soluble in hot benzene, benzene and turpentine and other organic solvents, slightly soluble in hot ethanol and ether. When heated to 400 ℃, slowly decompose, flammable, decomposed into stearic acid and the corresponding calcium salt in case of strong acid, hygroscopic. In plastics, machinery, rubber, paint ink and other industries as lubricant, sliding agent, heat stabilizer, release agent, etc.
At this time, we have a simple understanding of coated sand: coated sand, sand surface is covered with a layer of solid resin film before modeling sand or core sand. There are cold method and hot method of two kinds of film coating process: cold method with ethanol resin dissolved, and in the sand mixing process added ulotopine, so that the two coated on the surface of the sand, ethanol volatilized, coated sand; The thermal method preheats the sand to a certain temperature, adds the resin to make it melt, stirring the resin coated on the surface of the sand, adds the ullotopine aqueous solution and lubricant, cools, breaks, screens the coated sand. Used for casting steel and cast iron. Calcium stearate is widely used in coated sand. It is usually used as a lubricant of coated sand. It has an impact on the fluidity, agglomerative property, gas production, strength and thermal toughness of coated sand.
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