Study on Technology of Hardener for Furan Resin Sand Casting

The sulfonation process of concentrated sulfuric acid was studied. The hardener for furan resin casting was prepared by using xylene sulfonic acid and sulfuric acid ester as the main effective components. The factors affecting the curing of furan resin sand were analyzed. The hardener has the advantages of long working time, fast curing speed, high strength of molding sand and low sulfur content. The hardener has formed a mass production, stable application in casting production.