The output characteristics of tread rubbers (rolling losses, road holding, and wear resistance), which influence the main service properties of tyres, are determined by their elastic hysteresis properties, which can be estimated in the corresponding frequency and temperature ranges. To assess the elastic hysteresis properties of tread rubbers, wide use is made of the mechanical loss tangent (referred to hereafter as the loss tangent), which is the ratio of the loss modulus to the real component of the complex modulus. The loss tangent determined at 0 deg C characterizes the grip of tyres on wet road surfaces. In this case, the higher the loss tangent, the greater is the road holding, because, with low elasticity, the viscous component of the loss modulus and, accordingly, the friction coefficient of the rubbers increase. The loss tangent at 60-70 deg C characterizes the rolling losses. Accordingly, the lower the loss tangent, the lower are the losses. In the present work, the loss tangent was determined on an lnstron-8032 dynamic testing machine under a sinusoidal loading regime ata frequency of 5 Hz, a strain amplitude of 5% (epsilon0 = 0.05), and a static compressive strain of 20% (epsilon = -0.2) by a procedure developed at N(parallel)ShP. The test temperature was varied from -10 to +60 deg C. At lower temperatures, compounds based on solution butadiene-styrene rubbers begin to pass into the glassy state. The investigations were conducted on tread rubbers based on solution and emulsion butadiene-styrene and butadiene rubbers of different structure, and also rubbers based on solution butadiene-styrene rubbers with different contents of carbon black and silica filler.
The relationship between the temperature dependence of the mechanical loss tangent and the output characteristics of tread rubbers of different composition
Die Beziehung zwischen der Temperaturabhängigkeit des mechanischen Verlusttangens und der Ausgangsleistungsmerkmale der Profilgummis unterschiedlicher Zusammensetzung
International Polymer Science and Technology ; 36 , 7 ; T7-11
2009
5 Seiten, 7 Bilder, 3 Tabellen, 4 Quellen
Aufsatz (Zeitschrift)
Englisch
RUBBER COMPOSITION, TREAD, BASE TREAD RUBBER COMPOSITION, AND TIRE
Europäisches Patentamt | 2020
|Tread rubber composition, tread rubber and preparation method
Europäisches Patentamt | 2023
|