Polytetrafluoroethylene coatings are widely used in various industries due to their high chemical stability, wide temperature range, outstanding non-stickiness, good thermal stability, excellent aging resistance and radiation resistance. 2. However, the poor wear resistance of PTFE anti-stick coatings limits its application range to a certain extent.1 Coating formula (see Table 1) .
Test materials and main equipment 1.2 Main equipment Power-increasing electric agitator; 202-1 type electric ptfe coated fiberglass adhesive tape heating constant temperature drying oven; 4-10 type box-type resistance furnace; SS16 type liquid sandblasting machine; W-71 type spray gun. 1.1 Test materials Polytetrafluoroethylene concentrated dispersion SFN-1, Sichuan Chenguang; Tin bronze powder QSn6-6-3, Qishan, Shaanxi; Molybdenum disulfide (analytical grade), Shanghai Chemical Reagent Factory; Chromium trioxide (analytical grade),
Tianjin Chemical Reagent factory; polyphenylene sulfide resin, Zigong, Sichuan; titanate coupling agent NDZ-311, NDZ-311W, Nanjing Shuguang; Foamaster111 defoamer, Levelling620 associative leveling agent, film-forming aid alcohol ester 12 , Henkel, Germany; 7010 defoamer, Jieyang Tianyin; Triethylamine (analytical pure), Tianjin.
Preparation of modified polytetrafluoroethylene coating Choose polytetrafluoroethylene concentrated dispersion as the base material, add fillers (the fillers are dried through a 600-mesh screen) and additives, the steps are as follows: (1) Weigh the required concentrated PTFE dispersion and stir at high speed; (2) Add the required amount of tin bronze powder, molybdenum dioxide, chromium trioxide, polyphenylene sulfide resin, and stir at high speed.
Coating preparation and coating performance In this study, polytetrafluoroethylene suspension was used as the main component of the coating, and inorganic coatings such as chromium trioxide, bronze powder, molybdenum disulfide, organic filler polyphenylene sulfide resin and additives were added. The modified polytetrafluoroethylene coating developed in this experiment has excellent wear resistance and can effectively expand the application field of coatings.
