| 摘要 |
PURPOSE:To obtain a material light in weight, large in strength and excellent in adhesive quality of a frictional material and back plate, by charging a sheet state plastic material into a metal mold in combination of the friction material without performing the preliminary molding, heating and molding said plastic material under pressure then simplifying a process. CONSTITUTION:Resol stage phenol resin is formed such that phenols and aldehyde number are reacted in a normal manufacturing condition under presence of an alkaline catalyzer. Alkaline earth metal oxide or hydroxide is effectively used for a viscousness increasing agent, in which a plastic material without stickiness further with a good mold releasing characteristic of film can be obtained in a short maturing time by promptly increasing viscousness. Aluminum hydroxide, being able to improve flame resistance of a plastic material, is preferably used for a filling agent. Glass fiber, inorganic fiber and organic fiber can be used for a reinforcing agent. |
