Molding sand with chromite sand as main material and production method thereof

Molding sand with chromite sand as main material and production method thereof
The weight parts of its constituent raw materials are: chromite sand 85-90, nano attapulgite 10-15, thermoplastic phenolic resin 2.5-3.5, fatty alcohol polyoxyethylene ether 1.2-1.5, tricresyl phosphate 0.9-1.1, methyl Triethoxysilane 0.7-0.9, brick slag powder 23-25, zinc oxide 0.08-0.1, salicylic acid 0.9-1.1 and film former 1.0-1.5; the formula of the present invention is reasonable, and chromite sand is used as the main material , And adding nano attapulgite, the grain size of chromite sand is 200-220 mesh, the grain size of chromite sand helps to improve the strength and heat resistance of molding sand, and the curing agent brick slag powder helps to reduce the construction of molding sand. The roughness of the sand mold, and the invention not only has better heat resistance, but also has lower roughness and better air permeability, which can avoid sand sticking on the casting.