Co-vulcanization and properties of natural rubber-hydrogenated nitrile rubber composites
For blends of natural rubber(NR)and hydrogenated nitrile butadiene rubber(HNBR),problems such as mismatching vulcanization speed and dispersion of fillers due to the difference in unsaturation and polarity make it difficult to prepare NR/HNBR composites.In the present study,the problem of NR and HNBR co-vulcanization was resolved by first preparing NR and HNBR master batches with different sulfur/accelerator ratios,and then combining the master batches.Then,the phase structures of NR/HNBR and filler dispersion in NR and HNBR were examined.Based on the results of phase structures and filler dispersion,the effects of NR/HNBR blending ratios on the vulcanization characteristics,dynamic and static mechanical properties,heat build-up and wear resistance of the composites were analyzed.The results show that the Mooney viscosity of compounds increases,with the scorch time and cure time of the compounds with HNBR shortened.With the increase of HNBR content,the size of HNBR phase increases;the hardness and stresses at 100％or 300％strains of vulcanizates grow;the tensile strength,tear strength,elongation at break and tensile set decrease;the wear resistance and wet skid resistance improves,and the temperature rise of compression fatigue increases.
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