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백진욱(Jin-Wook Baek),정근우(Keunwo Chung),김영운(Young-Wun Kim),서인옥(In-Ok Seo),한정식(Jung-Sik Han) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Polyol esters were synthesized by condensation reaction of polyols (PE and DIPE) and linear acids such as valeric acid, caproic acid, heptylic acid and caprylic acid. The structures of polyol esters were confirmed by gas chromatography. Hot tube test was used to measure thermal stability of polyol esters and its thermal properties depended on the structure of acid moiety contained in polyol esters.
Synthesis and Wear performance of New tetrazole Derivatives containing Dithiocarbamate groups
Do-Hyeuk Hwang(황도혁),Young-Wun Kim(김영운),Keunwo Chung(정근우) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Several kinds of 1H-tetrazole-1-acetic acid esters containing mercaptobenzothiazole and dialkylenedithiocarbamate, which are potential environmentally friendly lubricating grease additives, were synthesized. The tribological properties as lubricating additives in 100N base oil, vegetable oil, diester oil, polyol ester oil, Li-soap greases and vegetable greases were evaluated using 4-ball tester and SRV tester. The results do not show that the esters have wear reducing characteristics for all concentrations at an ambient load. It is clear that the esters at the concentration of 1 wt% in Li-soap greases is effective at reducing the wear, which were EP value of 400N~1, 100N, COF value of 0.113~0.137, and WSD value of 0.474~0.591 depending on the structures of the esters.
암모니움 디티오카바메이트계 이온성 액체의 합성 및 내마모성능 (Ⅰ)
백승엽(Seung-Yeob Baek),김남균(Nam-Kyun Kim),신지훈(Jihoon Shin),정근우(Keunwo Chung),김영운(Young-Wun Kim) 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.6
The friction-reducing properties of lubricants containing ionic liquids based on ammonium dithiocarbamate are studied. The ionic liquids are produced through the following two steps: the synthesis of sodium alkyl dithiocarbamates via the substitution reaction of dialkylamine and carbon disulfide and their subsequent conversion into ammonium dithiocarbamate-based ionic liquids through an ion-exchange reaction with a quaternary alkyl ammonium halide salt. The structures of the ionic liquids are characterized by NMR spectroscopy and Fourier transform infrared spectroscopy. The isolated yields of the ionic liquids, which are viscous and pale yellow, are approximately 92%. The Brookfield viscosities and pour points of the ionic liquids are determined. Further, their wear resistances are measured through the four-ball wear test and the Schwingung Reibung Verschleiss (oscillation, friction, wear) test. The wear scar diameter of the lubricants containing 1 wt of the quaternary alkyl ammonium dithiocarbamate-based ionic liquids (0.475-0.631 mm) is significantly lower than that of the base oil (0.825 mm), proving that the ammonium dithiocarbamate-based ionic liquids have good frictionreducing characteristics. However, these friction-reducing characteristics fade significantly after long-term storage, owing to the degradation of the ionic liquids.
[I.T.S 부문] 금속가공용 PEG-Ester의 구조에 따른 드릴가공 성능
김세훈(Seahun Kim),강석춘(Suck-Choon Kang),김영운(Young-Wun Kim),정근우(Keunwo Chung),조원오(Wonoh Cho) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The metal-working industry is increasingly interested in synthetic metal-working fluids and coolants. Also, an environmental aspect of the treatment of used fluid is important. The excellent lubricating properties of PEG based ester have been recognized in the area such as hydraulic fluids and compressor lubricants. The main purpose of this study was to investigate the drilling properties of PEG based ester synthesized from PEG and several diacid against aluminums and copper by drilling machine. From the study, it was shown that there were some differences in the drilling properties depend on the structures of the PEG based ester.
남경임(Kyung-Im Nam),김영운(Young-wun Kim),정근우(Keunwo Chung),조원오(Wonoh Cho),전인식(In-sik Jeon),정용미(Yong-Mi Chung) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
In this study, biodegradable base Li-greases were prepared by using Li-soap thickener and vegetable oils such as soybean oil, rapeseed oil, castor oil and synthetic ester. Also, EP-greases were formulated by blending base Li-greases, anti-wear additives, EP additives, anti-oxidants and corrosion inhibitor etc.. And EP-greases were characterized by analysing physical properties such as worked penetration, dropping point, 4-ball wear, extreme pressure, thermal properties etc. Biodegradability of base Li-greases and EP-greases were evaluated by CEC-L-33-A-93 method using several inoculums of domestic sewage treatment plant. As the results, biodegradability of vegetable oils were shown at the range of 97.1 to 98.4%. And biodegradability of base Li-greases and EP-greases were 86.2% ~ 89.3% and 83.4% ~ 90.0% which were lower value than those of vegetable oils due to effect of Li-soap thickener, respectively. Therefore, the EP-greases prepared in this study were easily biodegraded by microorgnism.