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从今年年初起,我们在30~400毫米的水玻璃砂芯上,应用含食盐水的石墨作涂料;效果相当好。这种涂料刷在水玻璃砂芯上非常牢固,不会有裂纹和起卷现象,浇注出来的铸件表面光滑,没有包砂。涂料配制首先按15~20%食盐、85~80%水的重量比配制食盐水,并且搅拌充分,使食盐全部溶解在热水内。水用冷水和热水都可以,热但水的溶解速度快些。然后把石墨粉放在食盐水里,搅拌成一般水状石墨涂料的浓度。这种涂料由于含有食盐水,蒸发慢,使得
Since the beginning of this year, we have applied salt water-containing graphite as a coating on a sodium silicate sand core of 30 to 400 mm; the effect is quite good. This paint brush on the water glass sand core is very solid, there will be no cracks and curls, pouring the casting surface smooth, no sand pack. Paint preparation first by 15 ~ 20% salt, 85 ~ 80% by weight ratio of water preparation of salt water, and stirred well, so that all the salt dissolved in hot water. Water can be cold water and hot water, but water dissolves faster. Then put the graphite powder in salt water, stirring into the general concentration of aqueous graphite coating. This coating due to containing saline, evaporation slow, making