Method for toughening and modifying rigid polyvinyl chloride

The invention belongs to the toughening and modifying field of polymer composite materials, in particular relates to a method for toughening and modifying a rigid polyvinyl chloride composite material and aims at obtaining a graphene/polyvinyl chloride composite material and solving the performance defect of poor toughness of the rigid polyvinyl chloride material. A graphene carbon nanomaterial is evenly dispersed in a polyvinyl chloride matrix, a soft lamellar structure of the graphene capable of curling and bending in the polyvinyl chloride matrix serves as an elastic particle phase so as to play a role of toughening and modifying the polyvinyl chloride. Polyvinyl chloride powder, a stabilizer, a modifier acrylate and the graphene carbon nanomaterial are premixed in a high-speed stirrer to obtain the graphene/polyvinyl chloride composite material by using a process of melt bending through a torque rheometer and a two-roll mill and a process of hot pressing molding through a flat vulcanizing machine. According to the method for toughening and modifying rigid polyvinyl chloride, the soft and curly graphene layer plays a role of elastic particle in the polyvinyl chloride, so that the breaking elongation and the notch impact strength of the polyvinyl chloride can be obviously improved.