PRODUCTION OF PHENOLIC RESIN MOLDING MATERIAL

摘要

PURPOSE:To obtain a resol tape phenolic resin molding material capable of molding in short curing time in a mold while retaining stability of cylinder in injection molding. CONSTITUTION:Para-formaldehyde is reacted with phenol at a molar ratio of 1.25 in the presence of triethylamine at 60-80 deg.C for 1-3hr, and then ammonia is added to the reaction product and reacted with the reaction product at 80-100 deg.C for 3-7hr to afford a resol type phenolic resin. Calcium hydroxide is added to the phenolic resin and the phenolic resin is mixed and kneaded with the calcium hydroxide and filler such as glass fiber to provide the objective molding material.