ABSTRACT:Characteristics of rubber mixture were evaluated in order to find the optimum mixing conditions of compounds containing silica and silane at various temperatures. With different mixing temperatures of 105, 120, 130, 140 and 160 ℃, the viscosity of the compound mixed at 105 ℃ showed a very high viscosity value. Compounds mixed the temperature range from at 120 ℃ to 140 ℃ showed lower viscosity than the compound mixed at 105 ℃. However, the difference was found to be small in those temperature ranges. On the contrary, at the mixing temperature of 160 ℃, the viscosity of compound increased again. Through the physical and dynamic observations, it was verified that at the mixing temperature below 120℃ only insufficient silica-silane reaction has been obtained. In addition, with the elevated mixing temperature of 160 ℃, Cross-linking occurred during mixing by the sulfur contained in coupling agent. In the temperature ranges from 120 ℃ to 140 ℃, because of the fast coupling reaction at higher temperature, it was thought to be more advantageous during reaction even though the trend of viscosity and dynamic mechanical property was not clear. Ansarifar 등은 실리카-실란 반응의 최적 비율을 여러가지 물 성 평가를 통하여 제안한 바 있다.7 또한, Ha 등은 Py-GC/MS를 통한 고무복합체 내의 잔류 실란 분석을 통하여 실리카 비표 면적에 따른 최적 실란 농도가 존재하고 배합 시간에 영향을 받는다는 것을 규명하였다.8 실리카와 실란 커플링제 사이의 실란화 반응시 실리카의 수분 함량에 따른 실란화 반응효율의 Suk-Hee Jang et al. / Elastomers and Composites Vol. 48, No. 2, pp. 94~102 (June 2013
ABSTRACT:The properties of the rubber composites containing a silane and silica were evaluated by changing the mixing time and temperature, in order to find the optimum mixing conditions. Characteristics of the compounds were evaluated after mixing at 120 ℃, 140 ℃, and 160 ℃ with various mixing time. With increasing of mixing time, mooney viscosity decreased while the bound rubber contents of the compounds increased. Viscosity rise by increased mixing time was bigger at low temperature and the higher the mixing temperature the faster in the formation of bound rubber. With lower mixing temperature of 120 ℃, cross-linking rate was almost constant. Dynamic viscoelastic properties and dispersity of the compound showed that dispersion of ingredients and reaction was not sufficient with the mixing time of less than 10min. On the contrary, with high temperature, it was obvious that good dynamic and physical properties could be obtained due to sufficient coupling reaction, however it was thought this high temperature is not optimum because of sensitive cross-linking rate and physical properties and excessive formation of bound rubber. Consequently, it was confirmed that the mixing condition of 10min at 140 ℃ was optimum for the silane coupling reaction and dispersion of functionalized S-SBR containing silica and silane.
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