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산화방지제 종류에 따른 천연고무 배합물의 내열성 및 내크랙성
노종대(Jong Dae Roh),신정은(Jung Eun Shin),김진태(Jin Tae Kim),허재영(Jae Young Hur),김원호(Won Ho Kim) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.4
N/A In this study, heat and crack resistance of natural rubber (NR) compounds was evaluated. To prevent the effects of the crosslinking system, s conventional vulcanization system was selected, where the accelerator/sulfur ratio was fixed to 0.25. Vulcanizates containing phenylenediamine showed high tensile strength and tear strength compared to other vulcanizates because phenylenediamine can cause additional crosslinking and high dispersion in the vulcanizates. In the pure shear test, vulcanizates containing phenylenediamine showed an excellent tearing energy which was due to the irregular crack path, and showed excellent heat and crack resistance which was also due to the good dispersity of antioxidant and additional crosslinks in the rubbber vulcanizates.
김상근(Sang-Keun Kim),노종대(Jong-Dae Roh),한종대(Jong-Dae Han) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
Rolling bearing plastic cages used under high speed applications some are actually used at operating temperature up to 200℃. Such severe operating conditions. PEEK which is an extremely high heat resistant thermoplastic is sometimes used. But it cost is still very high. Here using polyethersulfone with good creep performance and heat resistant, material composition has been developed by making use of material's superior characteristics. These materials are composed mainly polyethersulfone(PES). We carried out characterization of the synthesis thermoplastic by testing of basis physical properties and analysis of a constituent and to evaluate of process by injection molding. This study has been investigating lubricating properties and durability test of the plastic cages appled to a ball and taper roller bearings.