Green coated sand

- Mar 07, 2020-

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