The Research On Hybrid Modified Polyformaldehyde Lubricant Composites For Slider

With the improvement of environment protection, excellent performance, green environmental protection of composites has been gaining popularity. Research of excellent mechanical properties, friction and wear performance, cheap and environmentally friendly sliders are important. Natural plant fiber is widely used in the preparation of composite materials because of its high rate of quantity and price, lightweight and biodegradable, etc.Lacquer Seed Shell(LSS) fiber and Potassium Titanate Whisker(PTW) were selected as the fillers to enhance Polyoxymethylene(POM) in this study. POM composites were prepared by melt extrusion and injection molding. Studied the influence of the content of fiber and PTW on the water absorptivity, mobility, mechanical property and tribological property of composites. The morphology of the impact fracture surfaces and worn surfaces was observed using Scanning Electron Microscopy(SEM), the molecular structure of the fiber before and after treatment was studied by Fourier Infrared Spectroscopy(FTIR). The main conclusions are as follows:1 Lss fiber's external hydroxyl was damaged by NaOH and its surface became rough.The chemical reactions between the silane and the fiber and the improvement of dispersibility of the PTW by silane treated.2 The impact strength of the LSS fiber/POM composites first increased then decreased with increasing fiber mass. The 20 wt.% fiber modified composites achieved the maximum impact strength.The tensile and flexural strength of the composites decreased with increasing fiber mass. The friction coefficient and wear loss of the composites also decreased with increasing fiber mass.3 The tensile and flexural strength of the PTW/POM composites first increased then decreased with increasing PTW content, 15 wt.% PTW modified composites achieved the maximum strength respectively. PTW reducing friction coefficient of the composites, but increasing the wear loss. Results showed that the composite 15 wt.%PTW+POM exhibited better overall performance. On this basis, LSS fiber was further incorporated into POM to prepare hybrid composites.4 It was found that compared with the 15 wt.%LSS fiber+POM composite, the tensilestrength and flexural strength of the 15 wt.% PTW+15wt.%LSS fiber+POM composite are increased by 23.37% and 18.2% respectively, but slightly lower than POM. The impact strength of the 15 wt.%PTW+15wt.%LSS fiber+POM composite is increased by 8.72%,144.5% increase compare with POM. The friction coefficient and wear loss are decreased by64.79% and 53.91% respectively compare with POM. The friction and wear properties of15 wt.%PTW+15wt.%LSS fiber+POM composites are significantly improved. But the mechanical properties of the composites need to be further improved for sliders.5 Lss fiber improves the melt flow rate and water absorption of the composite material.PTW has certain inhibitory effect of the liquidity of composites.