Preparation of Sand Mold Paint from Bentonite, Kaolin and Attapulgite Clays

Abstract

The research studied the using of bentonite, attapulgite, and kaolin clay for preparation of sand mold paint. Four samples were prepared and tested in the domestic foundries: the first mixture consists of attapulgite calcined at 1100°C, organoclay prepared from bentonite, starch, weight percentages were94 %,5%, and1% respectively, the second mixture was kaolin calcined at 1250°C, organoclay, and starch weight percentage were94 %,5%, and1% respectively, the other two samples were attapulgite and kaolin clay calcind at 1100 and 1250 °C respectively. The results showed that the mixture of calcined kaolin and calcined kaolin alone gave the best smoothness of the castings. The organoclay which was used as thickening agent in the mixture was prepared by treating attapulgite and bentonite with HDTMACl at different concentrations, different temperatures and times. The interlayer spacing of bentonite was increased with increasing amine loading.