Method for preparing phenolic Resin Binder for refractory and Foundry use

摘要

The present Invention relates to a method for preparing phenolic Resin Binders for use in refractory and FoundryCharacterized by the following steps: (a) reacting a phenol with a molar excess of an aldehyde in the presence of an Alkaline Catalyst until from 10 percent to 90 percent by weightThe aldehyde has been combined with the phenol; (b) acidifying the Reaction mixture in STEP (a) to a pH below 7; and (c) heating the acidified mixture from step (b) with a catalyst QEU promotes the formation of bridges between the Ortho Ortho phenolic benzyl ether cores until the free ALDEHYDE in the mixture is less than 2 percent by weight of the mixture.