Study On The Processing And Properties Of High Performance HNBR Composites

In this dissertation, with hydrogenated nitrile rubber as the matrix, a series ofresearch have taken on the preparation, structure and properties of HNBR compositeswere studied. The dissertation consists of four parts as follows.The first part, hydrogenated nitrile rubber composites were prepared by usingZMMA or the mixture of ZMMA and carbon black, silica, aramid fiber, carbonnanoutubes as reinforcing agent, respectively. The effect of ZMMA contents and itscombinationrate with other reinforcing agent on the properties of HNBR compositeswere studied. The ZMMA homopoIymerization and morphology structure evolutionof ZMMA during the vulcanization process were studied by DSC, FTIR, XRD, TEM,then the effects of curing time on the physical and mechanical properties of HNBRcomposites were investigated. The results showed that ZMMA is reactive filler, thescorching time and optimum curing time of the composites were shorted, and itsmaximum torque and crosslinking density were improved with the increase ofZMMA amount. When the ZMMA contents was30phr，the HNBR composites gotthe best mechanical properties. ZMMA increase thermal stability. With thecombination of ZMMA and carbon black, silica. the tensile strength, tear strength, thetensile strength at100%elongation of the HNBR composites increased with theincrease of ZMMA amount. Carbon black N220has better reinforcement effect.When the aramid fiber contents was10phr, the tear strength arrive the peak value.When the carbon nanoutubes/ZMMA blending ratios was6/24, the tear strengtharrive the peak value. The stretching vibration absorption peak of unsaturated doublebond and the characteristic diffraction peak of the crystal rapidly disappeared bydicumyl peroxideas as curing agent, there are significant amount of nanoparticlesdispersion in the rubber matrix. With the prolongation of the curing time, the tensilestrength and modulus at100%of the composites increased slightly, and both the tearstrength and elongation at break decreased. The second part, fluororubber were filled with different particle size carbonblack, the effects of different particle size carbon black on properties of FKMcomposites were investigated. Modify HNBR by FKM/HNBR blending technology,the effects of FKM/HNBR blending ratios on properties of FKM/HNBR blends wereinvestigated. The results showed that as the size of carbon black particle increased,the maximum torque and minimum torque of the compounds delined, optimum curetime shortened, the tensile strength, tear strength, modulus at100%and hardnessdecreased. The values of tan δmaxand storage modulus increased with increasing ofcarbon black particle size, the glass transition temperature became higher slightly.The vulcanizing efficiency of FKM/HNBR blends were improved with the increase ofFKM content, the modulus at100%of blends increased. When the FKM/HNBRblending ratios was30/70, blends has good thermal stability.The third part, the effect of some coagents,eg. TAIC, SR350, SR517onvulcanization characteristics and mechanical properties of HNBR composites. Theresults showed that the curing torque, modulus and hardness of HNBR compositesincreased as increasing amount of coagent, SR350showed better mechanicalproperties.The forth part, the packer rubber were prepared by using the high performancehydrogenated nitrile rubber composites. In the setting load of16tons, the temperatureis170℃, the sealing pressure is55MPa, to evaluate the sealing effect and servicelife. The results showed that the packer rubber at170℃,35~55MPa, more than1months to maintain good sealing effect.