PROCESS FOR THE PRODUCTION OF ENVIRONMENTALLY SAFE EXPANDED PLASTIC

摘要

A process for the production of environmentally safe expanded plastic involves foaming and curing of water-soluble resol phenol-formaldehyde resin with acid catalyst with use of additives followed by ageing expanded plastic at elevated temperature. According to the invention phenol-sulphonic acid solution with adjusted acidity index 200...290/and consumption of 7...22 % depending on basic content of phenol and formaldehyde in resol resin is used as acid catalyst.