Thiazole Type Accelerator Effects on Silane/Silica Filled Natural Rubber Compound upon Vulcanization and Mechanical Properties

Abstract

A thiazole type accelerator MBT (2-mercapto benzothiazole) was added into silica filled natural rubber (NR) compound with various concentrations (0, 1, 2, 3, 4 phr). The effects of MBT on the cure rate, mechanical property, degree of rubber-filler interaction (α F ), crosslinking density, and viscoelastic property (tanδ) were investigated. As accelerator concentration increased, the t s2 and t 90 decreased and the crosslinking density and modulus at 300% elongation increased. The tensile strength and elongation increased up to 3 phr and no further increased at 4 phr. The tan δ value measured at room temperature was higher than that of the 70 o C. The α F value was not affected by the addition of MBT. The mechanisms for the vulcanization rate were reviewed.Keywords: 2-mercapto benzothiazole(MBT), silica/natural rubber, cure rate, mechanical properties, vulcanization mechanism. 서 론

Measurements of the Silica-Silica Interaction Parameter (αF) of the Silane treated Silica Filled Natural Rubber Compound

“…1 그 동안 실리카의 보강효과, 2 실리카-실란의 반응, [3][4][5][6][7][8] 실란-고무의 반응, 9 실리카-실란 컴파운드에 대해 아연이온, 10 14,15 하지만 실란이 처리 된 실리카 시스템 내에서 αF값을 비교한 연구는 미비한 수준 이다. 16 αF는 가황물 내에 존재하는 충전제 구조의 특징을 묘사하 는데 이용되는 개념으로 입자간 상호관계계수("a measure of the in-rubber structure of the filler") 15 로 표현된다. 혹자는 입자-고무간 상호작용계수로 해석하였다.…”

“…혹자는 입자-고무간 상호작용계수로 해석하였다. 16 2) TESPT (bis (triethoxy silyl propyl) tetrasulfane), 3) poly (ethylene glycol), 4) Figure 1에 나타내었다.…”

“…The torque rise (Tmax-min) of each compound as a function of silica loading with various MBT content(1, 2, 3, 4 phr) 16. 1.…”

Optimization of Accelerator Mixing Ratio for EPDM Rubber Grommet to Improve Mountability Using Mixture Design

“…Silicones are used as materials for medical devices and electrical insulation owing to their non-toxic, weather-resistant, heat-resistant, and cold-resistant properties [1][2][3]. Ethylene propylene diene methylene (EPDM) rubber exhibits excellent ozone resistance but poor oil resistance, and it cannot be used in applications wherein it comes into contact with oil [4,5]. A grommet is one of many products made using EPDM rubber, and it is one of the main parts of automobiles that fixes and protects the wire harness from the outside to the inside of the vehicle [6].…”

Evaluation on the Biodegradability of the MBT Wastewater

“…Crude MBTs contain some amounts of impurities of aniline derivatives which can lead to COD. That is, wastewater includes NaMBT, MBT, and MBTs etc., and they are insoluble except NaMBT [2].…”