Acid-curable furfuryl alcohol prepolymer binders have improved properties when admixed with a dibasic acid di-ester of the composition R.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2 when n is from 1 to 8, R.sup.1 is furfuryl, and R.sup.2 is furfuryl or methyl. The diesters are preferably added in the amount of 5-35% by weight of total composition. These compositions are particularly useful in the preparation of sand cores and molds for foundry use which have improved strength and hardness. These furfuryl esters are also acid-curable and can be used alone as resin binders.
使用酸固化的
糠醇预聚物粘合剂与由组成式R.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2组成的二元酸二酯混合时,具有改良的性能,其中n为1至8,R.sup.1为
糠醇,R.sup.2为
糠醇或甲基。最好将二酯添加到总组合物的重量的5-35%。这些组合物在制备铸造用砂芯和模具时特别有用,其强度和硬度得到改善。这些
糠醇酯也可以作为
树脂粘合剂单独使用。