Investigation of the influence of carbon fillers on the manifestation of the effect of tensoresistivity in tire regenerates

An opportunity of development of electrically conductive rubber based on industrially produced tyre regenerate RShT-4 and Reg-1, obtained in laboratory conditions, with electrically conductive carbon fillers is shown. OMCARB CH85 carbon black (CB) produced by “Omsktehuglerod” Ltd. and Tenax-e HTS-45 carbon fibres (CF) produced by Toho Tenax America were used as electrically conductive fillers. Curing and rheometric properties of regenerates with different content of Santogard PVI and electroconductive fillers have been investigated. The study of physical and mechanical properties of regenerates has shown that introduction and increase of electroconductive CB and CF content in Reg-1 and RShT-4 leads to gradual reduction of elongation at break and increase in tensile strength and Shore A hardness, which is evidence of reinforcing effect of fillers. The effect of tensoresistance in the obtained regenerates depending on the content of electroconductive fillers is investigated. It is shown that addition of electroconductive CB to Reg-1 and RSHT-4 gives electroconductivity and tensoresistivity, that is, decrease of resistance in compression. Addition of CF leads to the opposite effect - increase of electrical resistance in compression. The possible mechanisms for the manifistation of tensoresistance at introduction of electroconductive CB and decrease of electroconductivity at introduction of CF are offered.