▎ 摘　　要

NOVELTY - Friction material for brake pads, comprises 5-10 pts. wt. graphene-carbon fiber material, 2-3 pts. wt. polyacrylonitrile fiber, 5-15 pts. wt. aramid fiber, 5-15 pts. wt. glass fiber, 5-25 pts. wt. phenolic resin, 10-30 pts. wt. filler, 0.1-0.5 pts. wt. titanate coupling agent, 0.1-0.3 pts. wt. molybdenum disulfide, and 3-6 pts. wt. silicide crystal whisker, where the graphene-carbon-carbon fiber material is prepared by (i) preparing alkynylated graphene; (ii) preparing azidomethacrylate; (iii) preparing modified graphene oxide; (iv) forming composite spinning solution; and (v) dipping the chopped carbon fiber in the composite spinning solution, adding specific amount of cobalt chloride hexahydrate aqueous solution, heating for 1 hour, removing solvent, pre-oxidizing mixture at 150-200°C, then under the protection of inert gas, firstly heating to 500-800°C for 30 minutes, then heating to 1000-1200°C for 10-20 minutes, and cooling. USE - Used as friction material for brake pads. ADVANTAGE - The friction material: uses phenolic resin as a binder, acrylonitrile fiber, aramid fiber and glass fiber to improve the strength of the brake pad; uses molybdenum disulfide and silicide whiskers as wear reducing agents to lubricate and stabilize the friction coefficient; improves the strength, wear resistance and high temperature resistance of the material; and improves the friction stability of brake pads at high temperature. DETAILED DESCRIPTION - Friction material for brake pads, comprises 5-10 pts. wt. graphene-carbon fiber material, 2-3 pts. wt. polyacrylonitrile fiber, 5-15 pts. wt. aramid fiber, 5-15 pts. wt. glass fiber, 5-25 pts. wt. phenolic resin, 10-30 pts. wt. filler, 0.1-0.5 pts. wt. titanate coupling agent, 0.1-0.3 pts. wt. molybdenum disulfide, and 3-6 pts. wt. silicide crystal whisker, where the graphene-carbon-carbon fiber material is prepared by (i) using thionyl chloride to activate graphene oxide, then reacting with propargyl alcohol to introduce active group alkynyl on the surface of graphene, and obtaining alkynylated graphene; (ii) preparing azidomethacrylate by esterification of 2-azidoethanol and methacryloyl chloride; (iii) performing click chemical reaction on alkynylated graphene and azidomethacrylate under the catalysis of cuprous bromide to prepare modified graphene oxide; (iv) ultrasonically dispersing the modified graphene oxide in tetrahydrofuran, bubbling with nitrogen for half an hour, carrying out free radical polymerization with acrylonitrile initiated by trithioester and azodiisobutyl group under nitrogen protection and formation of composite spinning solution; and (v) dipping the chopped carbon fiber in the composite spinning solution, adding specific amount of cobalt chloride hexahydrate aqueous solution, heating for 1 hour, then changing the distillation head to remove solvent, pre-oxidizing the mixture at 150-200°C, then under the protection of inert gas, firstly heating to 500-800°C for 30 minutes, then heating to 1000-1200°C for 10-20 minutes, and cooling to obtain the product.