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서강원(Kangwon Seo),이기양(Keeyang Lee),홍경민(Kyungmin Hong),전용(Yong Jun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Automobiles always have Severe environmental conditions. Therefore, Rubber parts of automobiles also are exposed to such severe conditions that automobiles have environmentally and durably. Particularly, Brake systems demand heavy durabilities and broad temperature conditions between about 120℃ and -40℃. Due to these conditions, it has been difficult that rubber are substituted to thermoplastic materials in the field of automobile industry. However, Environment-Friendly and Recyclability have made TPV (Thermoplastic Vulcanization) or TPE (Thermoplastic Elastomer) applied to automobile. In North-American and European automobile industry, Many precedents for TPV substitution could be investigated as well as in Japanese industry. In Brake system, PP/EPDM could be satisfied the severe conditions with both durability and environment conditions.
서강원(Kangwon Seo),성재혁(Jaehyuk Sung),홍경민(Kyungmin Hong),김억(Ok Kim),전용(Yong Chun) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Thermoplastic Vulcalnizations (TPV) was examined to be applied to the rubber parts like guard-valve-body and diaphragm in brake systems. Automotive rubber parts exposed to harsh environmental conditions and duration criteria unlike other industries, are not easy to be replaced with environmentally-friendly thermoplastic material. In Industrial conditions in addition to other polymer material fields, automotive rubber materials have difficuties to meet the friendly-environment conditions. In this study, TPV of PP/EPDM compounds close to the rubber properties in the middle of Thermoplastic Elastomer (TPE) were applied to the rubber parts in the needs like durabilities. Properties were inferior to thermoset rubber, but products performance requirements were satisfied. In brake systems, Guard-valve-body is able to protect the valve-body of booster from foreign matters and to control the air inlet, and Diaphragm is able to induce pressure between the two different rooms and to seal. When TPV of PP/EPDM was apllied for both guard-valve-body and diaphragm, properties results seems to be appropriate in the given environmental conditions. Satisfactory behaviors in automotive parts conditions were able to be determined with PP/EPDM in performance and durability.