| As a widely used general-purpose coating material,epoxy resin was often used in a variety of machinery parts coatings.In the trend of increasingly accurate mechanical parts,epoxy resin composites need to enter frictional steady state more quickly.So the self-lubricating ability of epoxy resin needs to be improved.Therefore,the tribological properties of epoxy resin matrix materials were improved by several interface design methods.Then,a novel epoxy substrate with multiple functions was synthesized by molecular level design.（1）Firstly,the micro-filler was modified by silane coupling agent,PTFE,graphite,MoS2 were used as the lubricating phase.Al2O3 was used as the reinforcing phase.The surface wear morphology of the epoxy material was observed by scanning electron microscopy and the friction performance of the epoxy material was studied by MRH-3G friction wear machine.It was found that when the weight ratio was W polytetrafluoroethylene: W graphite powder: W molybdenum disulfide: W alumina = 4:3:4:1.The coating could form an excellent friction film and lubricating film in the friction process,so that the coating has good wear resistance with a coefficient of friction of 0.119.（2）The silica sol was directly prepared by in-situ doping means,and compounding with the carbon nanotubes.Then the silica sol and the carbon nanotubes were used to participate in the three-stage curing process of epoxy resin.Furthermore this method could improve the utilization rate of the modified filler,the degree of modification,and enhance the performance of the epoxy resin matrix material.It was found that when（EPS、EP）/PA: CNTs = 24:1（wt:wt）,the prepared materials had the lowest dynamic friction coefficient value fluctuation range of 0.1500.175,and the lowest wear rate.The prepared cavity structure successfully wrappedthe PDMS simulated lubricating oil and was successfully released during the friction process.The control load was 200 N.The（EPS、EP）/PA-CNTs composite materials had high heat resistance and its initial decomposition temperature reached 344 °C.（3）A new method of combining liquid phase lubricants with solid phase lubricants has been developed.Meanwhile it has been demonstrated that the combination of liquid-solids binding phase coatings was superior to pure solid phase coatings.At the same time,a reactive filler was prepared to fix the liquid phase lubricant,which made the liquid phase lubricant controllable during the friction process.A mixed phase epoxy system with high stability and controllable interfacial friction behavior was obtained.Five kinds of composite materials（pure EP,EP/C/MoS2,EP/Oil,EP/Oil/C/MoS2,EP/Oil@C/MoS2@SiO2）were prepared,and the friction coefficient of them was compared.The EP/Oil@C/MoS2@SiO2 composite had the lowest dynamic friction coefficient.When the filler content was 45wt% EP,the friction coefficient fluctuation range was concentrated in 0.030.05.（4）An epoxy monomer TEE having a terminal group of a thiophene ring was synthesized.Then,a thermo reversible self-healing sulfur-containing epoxy resin material has been prepared by D-A reaction.The EP-DA structure was successfully constructed,and the reprocessing of epoxy scrap was realized based on the thermal reversibility of the reaction.The mean value of the friction coefficient of the composite materials were used as the basis data for calculating the healing efficiency.When the heat treatment time reached 100 min,the healing degree of epoxy scrap was more than 80% of the original sample.In the friction and wearing test,it was found that when the healing time was 100 minutes,the obtained reprocess coating and the original coating were in the same COF value fluctuation range,and the COF value fluctuation range of them were controlled between 0.14 and 0.16.It was indicating that the novel epoxy composites possessed a higher recovery ability of friction performance. |
