鑄鉄件砂型上的塗料,我厂过去是采用以下成分:黑鉛粉60％,粘土粉3％,紙漿2％,水35％。按以上成分放在碾式混砂机里碾拌一小时以后,它就成为均匀的膏狀物。使用时將混好的塗料用水調稀,成为比重1.4～1.45的塗料。这种塗料粘結力比較差,經过烘干以后,鑄型表面时常有起皮和剝落現象。澆鑄以后鑄件往往产生冲砂和粘砂等缺陷。 Casting pieces of sand paint, the factory in the past is the use of the following ingredients: 60% black lead powder, clay powder 3%, pulp 2%, 35% water. According to the above composition on the mill mixer after grinding for an hour later, it becomes a uniform paste. The use of mixed paint will be diluted with water to become a specific gravity of 1.4 to 1.45 of the paint. This paint adhesion is relatively poor, after drying, the mold surface often peeling and peeling phenomenon. Casting castings often produce red sand and sticky sand and other defects.