Preparation and characterization of brake linings from modified tannin-phenol formaldehyde resin and asbestos-free fillers

The new brake linings prepared with a new binder called modified tannin-phenol formaldehyde resin (MTFPR) and non-asbestos filler such as glass fiber, Kevlar aramid and stone wool as well as others was characterized. A mixture of oven-dried tannins from the bark of black wattle was first heated under atmospheric pressure at 140°C for one hour. The resulting solution was then allowed to cool to about 100°C. The reaction mixture was dissolved with 1,4-dioxane and filtered with a glass-fiber filter. The resulting dioxane-soluble parts were evaporated at 50°C under vacuum in order to remove dioxane. It was observed that brake lining prepared from MTPFR were slightly higher than those of prepared fron SNR.