抄録
A new type of furan-resin has been developed to improve the working environment and casting quality in foundries. Calcium chloride is added to conventional furan resin, and catalyst containing sulfuric acid is used. The formation of calcium sulfate and hydrochloric acid during the hardening process by the double decomposition between calcium chloride and sulfuric acid is anticipated. Since calcium chloride is sometimes relatively stable and hard to decompose in the temperature ranges of pouring and solidification, significant reduction of sulfurous acid gas is looked forward to. Hydrochloric acid may also additionally work as a superior catalyst for hardening.
In foundry trials, the newly developed furan resin was able to reduce sulfurous acid gas by about 50% compared with conventional ones during and after pouring heavy cast steel and iron. The hardening time and compressive strength of the molds using the newly developed furan binder were also better than that of conventional ones.
