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Physical Properties of the Silica-Reinforced Tire Tread Compounds by the Increased Amount of Vulcanization Agents

가교제 증량이 트레드용 실리카 컴파운드의 물성에 미치는 영향

  • Seo, Byeongho (Department of Chemical Engineering, Pusan National University) ;
  • Kim, Ki-Hyun (Department of Chemical Engineering, Pusan National University) ;
  • Kim, Wonho (Department of Chemical Engineering, Pusan National University)
  • Received : 2013.06.03
  • Accepted : 2013.07.22
  • Published : 2013.09.30

Abstract

In this study, effect of different amounts of sulfur and vulcanization accelerators in the acrylonitrile styrene-butadiene rubber (AN-SBR)/silica compounds on the properties of tire tread compound were studied. As a result, cure rate and degree of cross-linking of the compounds were increased due to enhanced cross-linking reactivity by the increased amounts of sulfur and vulcanization accelerators. Also, abrasion resistance and the mechanical properties such as hardness and modulus of the compounds were improved by enhanced degree of cross-linking of the compounds. For the dynamic properties, tan ${\delta}$ value at $0^{\circ}C$ was increased due to the increase of glass transition temperature ($T_g$) by enhanced degree of cross-linking of the compound, and tan ${\delta}$ value at $60^{\circ}C$ was decreased. Initial cure time ($t_1$) showed the linear relationship with tan ${\delta}$ value at $60^{\circ}C$. This result is attributed that reduced initial cure time ($t_1$) of compounds by applying increased amount of curatives can form cross-linking in early stage of vulcanization that may suppress development of filler network. This result is verified by observation on the surface of annealed compounds using AFM (atomic force microscopy). Consequently, decreased initial cure time is considered a very important parameter to reduce tan ${\delta}$ at $60^{\circ}C$ through reduced re-agglomeration of silica particles.

Acknowledgement

Supported by : 부산대학교

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