Furan resin sand curing agent selection

Furan sand is acid as a curing agent. Commonly used organic acid benzene sulfonic acid, toluene, xylene yellow yellow acid such as acid, inorganic acid, such as phosphoric acid sulfuric acid ethyl ester. When the phosphate as curing agent, the prepared core hygroscopicity, and phosphate in the sand in easy storage, only in the ductile iron or low carbon stainless steel case, in order to prevent the casting surface permeability S and with small amount of phosphoric acid, general regeneration sand using phosphoric acid as a curing agent;

Sulfuric acid corrosion resistance, preparation time also has the certain risk, although the curing speed, but the final strength is not high, but also in the sand accumulation problem, only in the disposable since the hard sand, but the temperature is too low when used. Generally uses organic acid by curing agent.

Toluene sulfonic acid is a white crystalline powder, soluble in water or alcohol use, according to their acidity and concentration of different, generally suitable for Yu Chun, summer, autumn, xylene yellow acid is more adaptive, according to the acid value and the concentration of the different, a year can be used in four seasons.

Curing agent technology parameters are mainly acid, free sulfuric acid content, viscosity.

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