首页>
外国专利>
Furan-phenolic resins for collapsible foundry molds
Furan-phenolic resins for collapsible foundry molds
展开▼
机译:呋喃酚醛树脂,用于可折叠的铸造模具
展开▼
页面导航
摘要
著录项
相似文献
摘要
A resin for coating sand and a resin-coated sand produced therefrom wherein the resin is prepared by incorporating furan into a phenolic novolak resin. In the preferred practice, the resin is produced by reaction of furfuryl alcohol with a phenolic compound at an acid pH to give a furfuryl-phenolic intermediate in a first step, and then, in a second step, reacting the furfuryl- phenolic intermediate with a lower aliphatic aldehyde to produce the resin. The resin-coated sands of the present invention provide unexpectedly improved shakeout and collapsibility characteristics in the shell process.
展开▼