PREPARATION OF PHENOLIC RESIN MOLDING

摘要

PURPOSE:To obtain the titled non-corrosive moldings by incorporating an acid curing agent and a powdered acid acceptor coated with a water-soluble polymer into a hydrous uncured resol type phenolformaldehyde resin liquid, and heating it for curing. CONSTITUTION:100pts.vol. Powdered acid acceptor (e.g. metallic zinc) having particle diameters of 0.005-1,000mu is coated with 5-100pts.vol. water-soluble polymer (e.g. PVA). Then, 5-40pts.wt. curing agent (e.g. phenolsulfonic acid) and 0.3-20pts.vol. aforementioned powdered acid acceptor per 100pts.vol. uncured resin are incorporated into 100pts.wt. hydrous uncured resol type phenol-formaldehyde resin liquid, and the composition is heated at 25-200 deg.C for curing.