High-wearing polytetrafluoroethylene composite material and method for making same

Abstract

The invention discloses polytetrafluoroethylene composite material with high wear resistance, which is characterized in that polytetrafluoroethylene, monomer, initiator and organic solvent are reacted and polymerized to form the composite material with the structure of a core and a shell; wherein, the content for the core part of polytetrafluoroethylene fine particle is 50% to 80%; the shell part occupies 20% to 50%; the weight ratio for raw material component is as below: 1% to 35% of PTFE micropowder (granularity ranges from 30 to 300 mesh), 45% to 705 of water, 1% to 30% of monomer, 0.1% to 1% of initiator (occupying rate among monomer), 0.2% to 4% of dispersing agent, 0 to 0.5% of stabilizing agent, 0.2% to 2% of surface-active material and little organic solvent. The preparation method comprises the steps that: firstly, mixed reaction polymerization; secondly, rinsing; thirdly, dehydration; fourthly, sieving; fifthly, packing. The invention has the advantages of high wear resistance for producing PTFE composite material and other advantages.

Description

technical field [0001] The invention relates to a technology in the field of polymer material modification, in particular to a polytetrafluoroethylene composite material with high wear resistance and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) is widely used in many fields because of its excellent chemical stability, high temperature resistance, ultraviolet radiation resistance, and low friction coefficient. It can even be used in harsh physical and chemical environments and other conditions However, due to the relatively low Tg (glass transition temperature) and high melting point of PTFE, this important known polymer is difficult to process, and it is generally mainly molded, and it is difficult to apply it in extrusion injection molding, which greatly limits it. Applications. If the Tg of the material surface can be increased, the compatibility, dispersion, wear resistance and other properties between them can be greatly imp...

AI Technical Summary

Problems solved by technology

This patent is prepared by mixing PTFE powder and polyacrylonitrile powder, and adding metal and metal oxides, etc., which improves the dispersion and wear resistance of PTFE to a certain extent, but the lack of compatibility between metal particles and PTFE is easy Phase separation will occur, and it will wear the grinding surface, increasing the friction coefficient of the material. In addition, the physical method also has the disadvantages of high production cost.