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폐 GMT 범퍼백빔 재활용을 통한 엔진언더커버용 친환경 리컴파운드재료 개발
유태욱(Taewook Yoo),홍존희(Johnhee Hong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
GMT is a glass fiber mat reinforced polypropylene and is mainly in use for automotive bumper backbeam which demands high stiffness and strength. GMT (Glass Mat Thermoplastics) Bumper Backbeam comes from ELVs (End-of-Life Vehicles) or car crash accident. Due to good mechanical properties of GMT, it is very difficult to crush a GMT Backmeam even for the disposal of it. Furthermore, the crushed glass fiber can be floated in the air and the minute dust is very harmful for human body. Consequently, used GMT is mostly disposed by landfill and incineration except for partial application as the process agent for improving flow ability in manufacturing a virgin GMT. In this paper, we have developed a new technology fur crushing and recycling GMT. By making use of this technique, we could recycle used GMT bumper backbeam as raw material which has good properties for injection molding by introduction of branching reaction and surface treatment filler in the weak PP-matrix and commercialize it for automotive engine under cover.
양준호(Juneho Yang),유태욱(Taewook Yoo),이동준(Dongjun Lee),석종민(Jongmin Seok),나성택(Seongtaek Na) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The new recycled rubber material, in this study, was developed with recycling waste EPDM & FPM rubber. The crushing process in the specific shredder under high temperature could make the waste rubber pulverized and semidevulcanized. By the following continuous devulcanization process in twin screw extruder, these pulverized rubber particles were almost devulcanized and more fine powder with the size of 50~150㎛ were acquired. The performances of these two processes were from the frictional shear stress and also optimized individually by DFSS(Design For Six Sigma). This rubber powder would be a major component in making a new recycled rubber compound. As a result of the measurement of mechanical properties and durability performances of molded products, this compound could meet material specification and be confirmed to have no trouble in compression mold test for manufacturing those products.
이동준(Dongjun Lee),양준호(Juneho Yang),유태욱(Taewook Yoo),김갑진(Kapjin Kim),이종순(Jongsoon Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To increase the molecular weight of the degraded nylon 6,6 by ethylene glycol, new chain extender was proposed, which can react with either the free amine group or the free hydroxyl group of degraded nylon 6,6. As a result of the application of new chain extender by 3 wt%, this paper classifies the molecular weight of degraded nylon 6.6 increased over 90% compared to virgin nylon 6,6.