초록 ▼

This invention relates to heat curable alumino-silicate binder systems comprising as three separate parts (1) a soluble source of silica, (2) a caustic solution of an alkali silicate, and (3) aluminum silicate, and an alcohol which may be incorporated into (1), (2), or both. The binder systems are m

This invention relates to heat curable alumino-silicate binder systems comprising as three separate parts (1) a soluble source of silica, (2) a caustic solution of an alkali silicate, and (3) aluminum silicate, and an alcohol which may be incorporated into (1), (2), or both. The binder systems are mixed with an aggregate to form a mix. The resulting mix is shaped and heated at an elevated temperature to form a cured shape, particularly foundry cores and molds. Heat is applied by warm air, baking in an oven, microwave, or preferably by hot-box equipment.

대표청구항 ▼

[ We claim:] [1.] A heat curable foundry binder system comprising as separate components:(A) a soluble source of silica,(B) a caustic solution of an alkai silicate, and(C) aluminum silicate, and(D) an alcohol selected from the group consisting of sorbitol, xylitol, meso erythritol, and mixtures ther

[ We claim:] [1.] A heat curable foundry binder system comprising as separate components:(A) a soluble source of silica,(B) a caustic solution of an alkai silicate, and(C) aluminum silicate, and(D) an alcohol selected from the group consisting of sorbitol, xylitol, meso erythritol, and mixtures thereof, which is incorporated into component (A), (B), or (C), such that the binder mix contains 1-15 weight percent silica, 60-80 weight percent alkali silicate solution having a solids concentration of 35-40 weight percent, 15-30 weight percent aluminum silicate, and 2-15 weight percent alcohol, where said weight percents are based upon the total weight of the binder.