| 摘要 |
PURPOSE:To obtain a porous carbon material suitable as a heat insulating material, etc., having improved strength, heat resistance and heat insulating properties simply and rapidly, by blending resol type phenolic resin with a specific blowing agent, a foam stabilizer, etc., expanding the blend and calcining it in a non-oxidizing atmosphere. CONSTITUTION:Resol type phenolic resin is blended with a blowing agent (e.g., trichloromonofluoromethane) consisting of an organic solvent, a foam stabilizer (e.g., polyoxyethylene sorbitan stearic acid ester) consisting of an anionic surface active agent or a nonionic surface active agent having >=14 HLB and an acid curing agent (e.g., p-toluenesulfonic acid). Then the blend is heated, expanded and cured to produce phenolic resin foam. Then this foam is calcined in a non-oxidizing atmosphere and carbonized to give the aimed porous carbon material. The prepared porous material is suitably used as a heat insulating material for combustion furnace, a heat insulating material for aircraft instruments, etc. |
