申请人:CL Industries, Inc.
公开号:US04481310A1
公开(公告)日:1984-11-06
Acid-curable, condensation-type resins, particularly phenolic resin prepolymers and urea-formaldehyde and/or furfuryl alcohol-formaldehyde modified phenolic resin prepolymers, 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 where n is from 1 to 8, R.sup.1 is furfuryl, and R.sup.2 is furfuryl or methyl. The di-esters 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. The dibasic acid di-esters of the composition R.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2 where n is from 1 to 8, R.sup.1 is furfuryl, and R.sup.2 is furfuryl or methyl are not reported in the literature and are novel compounds. These di-esters are oily liquids having high boiling points and are particulary useful as resin modifiers, diluents and plasticizers. These di-esters are produced by the sodium-catalyzed transesterification reaction of furfuryl alcohol with the liquid dimethyl esters of the C.sub.3 -C.sub.10 linear aliphatic dibasic acids at temperatures of about 214.degree.-240.degree. F.
酸可固化、缩聚型树脂,特别是苯酚树脂预聚物和尿素甲醛和/或糠醇甲醛改性苯酚树脂预聚物,与化学组成为R.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2的二元酸二酯混合后,其性能得到改善,其中n为1至8,R.sup.1为糠醇,R.sup.2为糠醇或甲基。这些二酯的添加量最好为总配方重量的5-35%。这些组合物在铸造用砂芯和模具的制备中特别有用,其强度和硬度得到提高。其中n为1至8,R.sup.1为糠醇,R.sup.2为糠醇或甲基的化学组成为R.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2的二元酸二酯未在文献中报告,是新颖的化合物。这些二酯是具有高沸点的油状液体,特别有用作树脂改性剂、稀释剂和增塑剂。这些二酯是通过糠醇与C.sub.3-C.sub.10线性脂肪二元酸液态二甲酯的钠催化酯交换反应在约214℉至240℉的温度下制备的。