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The addition of the silane coupling agent can not only improve the strength of the resin sand, but also organically combine the resin and the sand particles by chemical reaction, and at the same time bring about a decrease in the total gas generation amount of the resin, reduce the defects of the pores of the casting, and improve the high temperature performance and heat of the resin sand. Stability, which effectively improves the quality of castings and reduces costs.