| 摘要 |
PURPOSE:To produce a homogeneous frictional material having a sufficiently high strength, by hot-pressing a mixture containing an uncured phenolic resin, friction modifier and cut fiber bundle having a specific fineness and curing the above-mentioned phenolic resin. CONSTITUTION:A mixture containing (A) 100pts.wt. molding phenolic resin powder, (B) 10-50pts.wt., preferably 20-40pts.wt. frictional modifier, preferably cashew dust, barium sulfate powder having 40-200 mesh particle size, etc., and (C) 5-50pts.wt., preferably 10-40pts.wt. cut fiber bundle obtained by applying a binder (e.g. phenolic emulsion) in an amount of 0.1-10wt.%, preferably 0.5-5wt.% expressed in terms of solid matter to glass fibers having 3-30mu, preferably 5-15mu thickness, bundling the glass fibers, drying the resultant fiber bundle to provide 10-60g weight based on 1,000m and cutting the dried fiber bundle to 1-40mm, preferably 1.5-13mm length is hot-pressed at 180 deg.C under 200kg/cm<2> to cure the component (A).
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