▎ 摘　　要

NOVELTY - Preparing graphene polytetrafluoroethylene nano-composite film split fiber, involves stirring and mixing the graphene derivative, diffusing agent, and polytetrafluoroethylene dispersion resin at 30-50 revolution per minute, below 19℃ to obtain a mixture, where mass ratio of graphene derivatives, diffusing agent, and polytetrafluoroethylene dispersion resin is 1: 1-2.5: 60-90, the diffusing agent is made of a dispersant, a stabilizer and a non-ionic active agent with a mass ratio of 1-14: 1-8: 1-11 by using a homogenizer to stir and mix. The lubricant is added to the mixture, mixed well, matured, then pre-pressed, pushed, calendered to form a film, dried and degreased, first heated and stretched, followed by slitting, second heat stretching, and then heat setting to obtain finished silk, where the mass ratio of the mixture and lubricant is 5-7: 1. USE - Method for preparing graphene polytetrafluoroethylene nano-composite film split fiber. ADVANTAGE - The composite fiber increases fracture strength of more than 40%, and the fiber is endowed with an excellent new conductive function, and open up a new application field of military shielding materials. DETAILED DESCRIPTION - Preparing graphene polytetrafluoroethylene nanocomposite film split fiber, involves stirring and mixing the graphene derivative, diffusing agent, and polytetrafluoroethylene dispersion resin at 30-50 revolution per minute, below 19℃ to obtain a mixture, where mass ratio of graphene derivatives, diffusing agent, and polytetrafluoroethylene dispersion resin is 1: 1-2.5: 60-90, the diffusing agent is made of a dispersant, a stabilizer and a non-ionic active agent with a mass ratio of 1-14: 1-8: 1-11 by using a homogenizer to stir and mix. The lubricant is added to the mixture, mixed well, matured, then pre-pressed, pushed, calendered to form a film, dried and degreased, first heated and stretched, followed by slitting, second heat stretching, and then heat setting to obtain finished silk, where the mass ratio of the mixture and lubricant is 5-7: 1, stirred and mixed with speed of 30-50 rpm for 15- 30minutes, and the ambient temperature is lower than 19℃. The diffusing agent is mixed into the micropowder of graphene derivatives, stirred uniformly, then added polytetrafluoroethylene dispersion resin and mixed to obtain a prefabricated mixture, where diffusion agent is made of dispersant, stabilizer and non-ionic active agent with a mass ratio of 1-14:1-8:1-11 using a homogenizer to stir and mix, where mass ratio of graphene derivatives and polytetrafluoroethylene dispersed resin is 1-2 5: 100-200, the mass ratio of the diffusing agent to the fine powder of the graphene derivative is 4-6:4-6. The prefabricated graphene PTFE composite material powder is mixed with polytetrafluoroethylene (PTFE) dispersion resin for a second time to obtain a mixture, where the mass ratio of the prefabricated graphene polytetrafluoroethylene nanocomposite micropowder and the polytetrafluoroethylene dispersion resin mixed by secondary stirring is 3-4: 3-4, stirring speed of 30-50 rpm and stirring time of 15-30 minutes. The lubricant is added to the mixture, mixed well, ripened, then pre-pressed, pushed, calendered into film, dried and degrease, heat stretch for the first time, cut, heat stretch for the second time, and then heat-set and twist to obtain wire winding, where mass ratio of the mixture to the lubricant is 5-7: 1, 30-50 rpm stirring and mixing, stirring time 15-30 minutes, ambient temperature below 19℃. The lubricant is mixed with the diffusing agent component into the graphene derivative micropowder, stirred uniformly, and then stirred and mixed with the polytetrafluoroethylene dispersion resin at 30-50 revolution per minute, where diffusion agent is made of dispersant, stabilizer and non-ionic active agent with a mass ratio of 1-14:1-8:1-11 using a homogenizer to stir and mix, and the mass ratio of graphene derivatives, diffusing agent, lubricant, and polytetrafluoroethylene dispersion resin is 1-1.5: 1-2.5: 15-25: 70-85. The mixture is matured, then pre-pressed, pushed, calendered to form a film, dried and degreased, heated and stretched for the first time, cut, thermally stretched for the second time, and then heat-set and twisted to obtain the finished silk roll around.