PRODUCTION OF LOWLY CORROSIVE RESOL PHENOLIC RESIN FOAM HAVING LOW WATER ABSORPTION

摘要

PURPOSE:To obtain the titled foam useful as an insulating material for general construction and building or a material for chemical tanks, by using a combination of specified two silicone oil surfactants as a foam stabilizer and producing open cells in a high content and completely penetrating a volatile nitrogen base. CONSTITUTION:A lowly corrosive resol phenolic resin foam having low water absorption is obtained by expanding a mixture containing a resol phenolic resin precondensate, a blowing agent and a curing agent by using a combination of the below-described two surfactants as a cell stabilizing surfactant and subjecting the obtained foam to a neutralization treatment with a volatile nitrogen base: (A) 100pts.wt. silicone oil surfactant consisting mainly of a compound selected from methylhydrogenpolysiloxanes and (B) 30-300pts.wt. silicone oil surfactant consisting mainly of a compound selected from the group consisting of siloxane/oxyalkylene block copolymers and polyalkylsiloxanes.