▎ 摘　　要

NOVELTY - A modified phenolic resin-based composite material comprises 60-90 %mass modified phenolic resin and 10-40 %mass glass fiber cloth. The modified phenolic resin is prepared by modifying graphene, urea and melamine. In the composite material, the layers are arranged in parallel, each of the two layers of glass fiber cloth are bonded by phenolic resin, the glass fiber cloth is a square cloth or gridding cloth, is a plain weave, twill weave or satin weave. Also claimed is, the preparation method of modified phenolic resin-based composite material, which involves mixing graphene solution, phenol and formaldehyde solution, heating, stirring, adding sodium hydroxide, heating, stopping heating, orderly adding sulfuric acid solution, urea and melamine, heating, stopping heating, rotary-evaporating to obtain modified phenolic resin solution, coating layer of release agent on mold surface, coating layer of modified phenolic resin solution, and rolling on mold surface. USE - Modified phenolic resin-based composite material. ADVANTAGE - The modified phenolic resin-based composite material has improved strength, toughness, friction resistance, and bonding force, and is prepared by simple and economical process. DETAILED DESCRIPTION - A modified phenolic resin-based composite material comprises 60-90 %mass modified phenolic resin and 10-40 %mass glass fiber cloth. The modified phenolic resin is prepared by modifying graphene, urea and melamine. In the composite material, the layers are arranged in parallel, each of the two layers of glass fiber cloth are bonded by phenolic resin, the glass fiber cloth is a square cloth or gridding cloth, is a plain weave, twill weave or satin weave. Also claimed is, the preparation method of modified phenolic resin-based composite material, which involves (1) mixing 1-2 pts. wt. graphene solution with concentration of 0.1-0.5 mg/mL, 550-650 pts. wt. phenol and 2200-2300 pts. wt. formaldehyde solution, placing in a water bath, heating, continuously stirring, adding 5-20 pts. wt. sodium hydroxide, continuously heating, and stopping heating after reacting at constant temperature for a certain time, (2) orderly adding 120-150 pts. wt. 30 wt.% sulfuric acid solution, 520-550 pts. wt. urea and 130-180 pts. wt. melamine after the reaction system is cooled, continuously heating, stopping heating after reacting at constant temperature for a certain time, and cooling the reaction system, (3) placing the mixed solution in a rotary evaporator, and rotary-evaporating for a period of time at a constant temperature until the solution viscosity reaches 3000-6000 mPa.second to obtain modified phenolic resin solution, (4) uniformly coating a layer of release agent on a surface of a mold, coating a layer of modified phenolic resin solution, rolling on a surface of the mold using a pressure roller until the phenolic resin is uniformly distributed on the mold surface, paving the phenolic resin surface with glass fiber cloth, coating a glass fiber cloth surface with a layer of modified phenolic resin solution, and uniformly distributing the phenolic resin using the pressure roller, where the pressure applied by the pressure roller is 4000-8000 Pa, and the speed is 2-5 cm/second, and (5) repeating the above steps 5-20 times, after laying 5-20 layers of glass fiber cloth, closing the mold, placing in the oven to heat above the phenolic resin curing temperature, maintaining the temperature for a period of time to fully cure, taking out, and opening the mold.