Study On The Cutting Resistance Performance Of Tire Tread

The effect of various factors on cutting resistance performance of tire tread was studied by using natural rubber(NR) as matrix material in this essay. The effect of two mixed filler systems on cutting resistance performance of tire tread was also researched. The main research work was divided into the following three parts:(1)The effect of CB content on mechanical properties of tire tread was studied by using NR and reinforced NR with N330 CB. The effect of CB content and notch on tire tread crack initiation and propagation was studied.(2)Fibriform attapulgite(AT) was modified by ball mill and silane(Si11-110). The mechanical properties and cutting resistance property of tire tread reinforced by modified AT and CB were studied.(3)The synergistic reinforced effect of carbon materials of two-dimensional lamellar nano-graphite and zero-dimensional nano-CB on tire tread was researched.The results show: With CB content increasing, the stress at 100%, 300%,right-angle tear and trousers tear strength of natural rubber mass-tire tread only reinforced by CB increase and its elongation at break decreases. But its tensile strength almost has no change with CB content increasing. With CB content increasing, payne effect reinforces, linear viscoelastic range reduces and strain amplification effect reinforces. In tensile test of pure NR, there is not tearing fracture morphology because of crack propagating before induced crystallization for notch existing. With CB content increasing, strain amplification effect of tire tread reinforces, which can result in strain induced crystallization in lesser strain. The crystallization in lesser strain can hinder crack propagation and help form "steps" fracture morphology. For tire tread with 50 phr CB, with notch depth increasing, stress growing rate of crack tip increases, the orientation time of rubber molecular chain in crack tip reduces, and “step” numbers of fracture morphology reduce. The mechanical properties of CB and AT synergistic reinforced tire tread are better than it reinforced only by CB. Especially,the tire tread co-reinforced by ball milling modification AT and CB has the best mechanical properties and the most stable cross-linked network structure, which can improve the cutting resistance performance of tire tread. With AT content increasing, a phenomenon of AT contacting with each other occurs in tire tread with 10 phr AT.Therefore, the tire tread gets the best cutting resistance performance when it is reinforced by AT and CB and the AT content is at 4 phr. CB and graphite have obvious synergistic effect in reinforcing tire tread. When CB/G is 10/30, ML is minimum, and spherical nano CB may be mixed in the middle of lamellar graphite,which increases the dispersion and the surface area of graphite. In this station, More and more rubber chains are absorbed by this graphite, which leads to average chain segment length decreasing and physically cross-linked network increasing and nonlinear viscoelastic advancing. When CB/G is 10/30, the tire tread has the largest stress at 100%, 300%, tensile strength, fracture permanent deformation and the best cutting resistance performance.