Optimization of mixing conditions for silica-reinforced natural rubber tire tread compounds

Wisut Kaewsakul, Kannika Sahakaro, Wilma K. Dierkes, Jacobus W.M. Noordermeer

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The dump temperature and mixing interval between rubber, silica and silane coupling agent for silica-filled natural rubber (NR) tire tread compounds using bis-triethoxysilylpropyl tetrasulfide (TESPT) as silane were optimized. The dump temperature turns out to be the key parameter governing the properties of the silica-filled NR compounds. The increase in viscosity of the compounds by changing the dump temperature from 100-150oC indicates that inevitably some cross- linking of NR occurs by sulfur contained in TESPT, simultaneous with the silanization reaction between silica and silane. However, the viscosity decreases again when dump temperatures above 150oC are applied, indicating a dominant occurrence of degradation of the NR-molecules. The results are in good agreement with bound rubber contents. The overall properties indicate that a dump temperature in the range of 135-150oC and a silica-silane-rubber mixing interval of 10 minutes are the most appropriate mixing conditions for silica-filled NR compounds with TESPT as coupling agent.
Original languageEnglish
Title of host publicationUnknown
Place of PublicationCleveland, Ohio, USA
PublisherACS Rubber Division
Publication statusPublished - 11 Oct 2011
Event180th Technical Meeting ACS Rubber Division - Cleveland, United States
Duration: 11 Oct 201113 Oct 2011
Conference number: 180

Publication series

PublisherACS Rubber Division
ISSN (Print)1547-1977


Conference180th Technical Meeting ACS Rubber Division
Country/TerritoryUnited States


  • METIS-284228
  • IR-87225


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