| In this paper, mechanical blending (melting method) and blending and co-coagulating(emulsion method) were respectively adopted for the preparation of molybdenum disulfide/rubber composites mainly applied in rubber sealing materials under dynamic conditions.During the preparation, molybdenum disulfide was selected as the additive with anti-wear andanti-friction property, meanwhile, nitrile butadiene rubber with good oil resistance and widelyused styrene-butadiene rubber were selected as rubber matrix. The study is aimed at solvingthe contradictions among mechanical performance, abrasion resistance and friction coefficient,and optimizing the preparation by comparing composites’ performances prepared by meltingmethod and those prepared by emulsion method.Firstly, molybdenum disulfide was organically modified by successively adopting impactmodifiers such as cetyl trimethyl ammonium bromide (CTAB), Maleic anhydride (MA),Poly-(ethylene glycol)(PEG), Silane Coupling Agent KH570and Stearic acid (SA), and thenby adopting compound modifiers made from the combinations of any two of them. Theanalysis of XRD and IR spectrum showed that organic modifiers didn’t intercalate into thelayers of Molybdenum disulfide but only coated on the surface of molybdenum disulfideparticles, which have had some modification effects on molybdenum disulfide.In this paper, the properties of nitrile butadiene rubber/molybdenum disulfide andstyrene-butadiene rubber/molybdenum disulfide prepared respectively by melting method aswell as emulsion method are systematically studied. It is confirmed by XRD Analysis, SEMAnalysis and TEM Analysis that molybdenum disulfide disperses in rubber materials bymicrometer scale, keeping its special lamellar structure. With the increase in the fillingamount of molybdenum disulfide, the modulus of composites prepared by direct blending improves. However, because of the large particle size of dispersed phase, phase interfaces arenot finely combined and materials’ comprehensive mechanical properties decrease. Byadopting MMW-1universal friction and wear tester to measure friction coefficients of nitrilebutadiene rubber/molybdenum disulfide and styrene-butadiene rubber/Molybdenumdisulfideboth prepared by direct blending, increasing the amount of Molybdenum disulfide isdiscovered can decrease the material’s friction coefficient to a certain degree. However, byadopting composites prepared by blending and co-coagulating, molybdenum disulfideparticles are more homogeneously distributed. As the filling amount of molybdenum disulfideincreases, mechanical properties of composites increase more effectively and their frictioncoefficients decrease more greatly. |
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