The Preparation And Properties Of Novel Anti-Skid Rubber Composites

In this thesis, the test method of rubber coefficient of friction （COF） was optimized byanalyzing several factors which affected the test based on the rubber friction mechanism.Natural rubber （NR）/Silicone dioxide graft toluene diisocyanate （SiO₂-g-TDI） compositesmaterials with excellent anti-skid performance for sole were prepared by a graft modification.Tetra-needle-shaped zinc oxide （T-ZnOw）, special whisker, with its unique three-dimensionstructure provide an isotropy properties, thus enhance the anti-skid properties in polymercomposites. So, we did a research on the anti-skid properties of NR/SiO₂/T-ZnOwcomposites. This research is of great theoretical significance and the material has goodapplication prospects.The effects of vulcanizate crosslinking density, surface roughness of rubber sheet, thefiller types, different sliding speeds and water volume were investigated by using vulcanizateCOF measurements. The results show that the data of COF is stable and credible when thevulcanizate was placed for more than one month; the sliding speed makes an important rulewhen the water exists as lubricant. We have found that a faster sliding speed led to a smallerCOF by comparing the two sliding speeds.In addition to the viscoelasticity, the COF was also subject to the surface asperities, theresult shows that the roughness increased with increase of COF after using sandpaper on thesurface of the rubber. When the fillers are enclosed inside the rubber, the slides take placebetween rubber and hard substrate. They will make a difference on COF when they wereexposed on the surface, for their structure and properties. The result of this experiment alsoreveals that the wet skid resistance （WSR） decrease as the volume of water used in themeasurement rises.We found that SiO₂can make a nice performance in WSR, and the optimum amount ofSiO₂is40phr. Toluene diisocyanate （TDI） molecules were introduced to the surface of SiO₂by chemical grafting method. The modification of SiO₂made NR/SiO₂-g-TDI composites anobvious improvement of COF both in dry and wet condition. The result reveals that themodification of SiO₂is effective improving the COF of rubber composites.The addition of T-ZnOw obviously increases the vulcanizing time and the torque. Thetensile strength reached a climax and the DIN abrasion reached its minimum when the amountof T-ZnOw is5phr, and the tear strength reached the peak when it is10phr. T-ZnOw hasnothing to do with the shore A hardness of the NR/SiO₂composites as the amount of T-ZnOwvaried from0phr to20phr. The COF both in dry and wet condition had been improved obviously, the COF in wet condition even run above1.0at the speed of150mm/min.