고무의 충전제로 사용되는 실리카의 보강효과를 높이기 위해 실란 커플링제인 bistriethox ysilyipropyltetrasulfide(Si 69)와 ${gamma}$-mercaptopropyltrimethoxy silane(MPS)를 사용하여 실리카의 화학처리를 건식법과 습식법으로 행하였으며, 실란 커플링제를 직접 실리카와 혼합하는 건식법보다 혼합하기 전에 화학적으로 처리하는 건식법이 분산성, 젖음성, 동적특성 및 안정성에서 더욱 우수하였다. 화학처리된 실리카를 SBR 배합에 니더와 믹싱롤을 사용하여 균일하게 혼련하였고 측정한 물성으로부터 비교, 검토하였으며, 실란 커플링제를 사용하지 않을 때보다 물성이 현저히 증가하였으며, 실험으로부터 건식법의 경우 Si 69와 MPS의 최적 사용량은 2 w/w%이지만. 습식법의 경우 EA 및 TGA 분석으로부터 4 w/w% 이였다.
A study was made on the chemical treatment of silica and silane coupling agents, bistriethox ysilylpropyltetrasulfide(Si 69) and ${gamma}$-mercaptopropyltrimethoxy silane (MPS) for reinforcement of silica formulation. The effects of chemical treatment method and the most popular two coupling agents were examined. The results clearly indicate that the wet method, coupling agent is combined chemically with the silica prior to mixing, has more dispersion, wetting ability, dynamic properties and stability than the dry method, coupling agent is premixed directly with the silica. The mixing was done using a bench-type kneader having two mixing cam and a two-roll mill, under approximately similar conditions. The physical properties of SBR vulcanizates give rise to marked improvements by addition of Si 69 and MPS in comparison with without silane coupling agents. The optimum amount of Si 69 and MPS was 2 w/w% by experiments in the dry method but was 4 w/w% by EA and TGA analysis in the wet method.
