Coated sand

- May 07, 2020-

Coated sand

The sand surface is covered with a layer of solid resin film molding sand or core sand before molding. There are two coating methods: cold method and hot method: cold method uses ethanol to dissolve the resin, and urotropine is added during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain the coated sand; hot The method preheats the sand to a certain temperature, adds resin to make it melt, stirs to coat the resin on the surface of the sand, adds aqueous solution of urotropine and lubricant, and cools, crushes, and sieves to obtain the coated sand. Used for casting steel and cast iron.

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