• Title/Summary/Keyword: Triethylene glycol

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Developing Eco-Friendly Resin Wax Remover for Printing Table of Flat Screen (친환경 플랫스크린 수지왁스용해제의 개발에 관한 연구)

  • Son, Eun-Jong;Park, Geon-Hui;Lee, Beom-Su;Im, Sang-Jun
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.04a
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    • pp.95-97
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    • 2008
  • In this study eco-friendly wax remover for printing table of flat screen was investigated. Seven organic solvents, diethylene glycol monomethyl ester, triethylene glycol monomethyl ester, triethylene glycol monobutyl ester, tripropylene glycol monomethyl ester, dimethyl sulfoxide(DMSO), trichloro ethylene(TCE), tolune, were used as resin wax remover. The resin wax solubility with solvents was investigated. DMSO was found to be the most suitable eco-friendly resin wax remover.

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Kinetics of the Reaction of Long Chain Alkyl Acetal Type Nonionic Surfactants (장쇄(長鎖)알킬 아세탈형(型) 비(非)이온성(性) 계면활성제합성(界面活性劑合成)에 관한 반응속도론적(反應速度論的) 연구(硏究))

  • Shon, Joo-Hwan;Lee, Seung-Youl;Nam, Ki-Dae;No, Seung-Ho
    • Journal of the Korean Applied Science and Technology
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    • v.5 no.1
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    • pp.41-51
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    • 1988
  • Aliphatic aldehyde polyoxyethylene glycol acetals were synthesised through the reaction of aliphatic aldehydes such as caproic aldehyde, capryl aldehyde, capric aldehyde and lauric aldehyde with excess diethylene glycol, triethylene glycol and tetraethylene glycol, respectively. The acetal formation, in which water was azeotropically distilled by adding benzene to the reaction system, was gained a good yield of acetal type compounds. This reaction is found pseudo first order reaction at various temperatures such 70, 80, 90 and $97^{\circ}C$. Also these activation energies of reaction of acetal type products such as caproic aldehyde diethylene glycol acetal, capryl aldehyde diethylene glycol acetal, capric aldehyde diethylene glycol acetal, lauric aldehyde diethylene glycol acetal, caproic aldehyde triethylene glycol acetal and caproic aldehyde tetraethylene acetal were 17.3, 19.6, 21.2, 21.6, 15.5 and 14.7 Kcal/mole.

An Experimental Study on the Performance Characteristics with Height of a Fin-Tube Liquid Desiccant Dehumidifier (휜-튜브형 액체건조제 제습기의 높이에 따른 성능특성에 관한 실험적 연구)

  • Lee, Su-Dong;Park, Moon-Soo;Chung, Jin-Eun;Choi, Young-Seok
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.5
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    • pp.594-603
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    • 2004
  • Several desiccant cooling systems have been developed in terms of cost and performance. In this study a fin-tube exchanger has been used for liquid desiccant dehumidification system. This dehumidifier has been designed to study the absorption characteristic of the aqueous triethylene glycol(TEG) solution which has the flow range from 20 to 50 LPM. The dehumidifier performance characteristics of working factor variables such as inlet solution flow rate, air flow rate, solution concentration and brine temperature have been analyzed. This dehumidifier has the ability to provide running while saving the latent heat load of total energy. The result of this experiment can provide useful data for hybrid air conditioning system.

An Experimental Study on the Performance Characteristic with Height of a Fin-Tube Liquid Desiccant Dehumidifier (핀-튜브형 액체건조제 제습기의 높이에 따른 성능특성에 관한 실험적 연구)

  • Lee, Su-Dong;Park, Moon-Soo;Chung, Jin-Eun;Lee, Jin-Soo
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.25-30
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    • 2003
  • Several desiccant cooling systems have been developed in terms of cost and performance. In this study a fin-tube exchanger has been used for liquid desiccant dehumidification system. This dehumidifier has been designed to study the absorption characteristic of the aqueous triethylene glycol(TEG) solution which has the flow range from 20 to 50 LPM. The dehumidifier performance characteristic of working factor variables such as inlet solution flow rate, air flow rate, solution concentration, solution temperature, brine temperature, air temperature and inlet air relative humidity has been analyzed. The result of this experiment can provide useful data for hybrid air conditioning system.

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Optimization Study on Polymerization of Crosslink-type Gel Polymer Electrolyte for Lithium-ion Polymer Battery (리튬이온폴리머전지용 가교형 겔폴리머전해질의 중합조건 최적화 연구)

  • Kim, Hyun-Soo;Moon, Seong-In;Kim, Sang-Pil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.1
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    • pp.68-74
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    • 2005
  • In this work, polymerization conditions of the gel polymer electrolyte (GPE) were studied to obtain better electrochemical performances in a lithium-ion polymer battery. When the polymerization temperature and time of the GPE were 70$^{\circ}C$ and 70 min, respectively, the lithium polymer battery showed excellent a rate capability and cycleability. The TMPETA (trimethylolpropane ethoxylate triacrylate)/TEGDMA (triethylene glycol dimethacrylate)-based cells prepared under optimized polymerization conditions showed excellent rate capability and low-temperature performances: The discharge capacity of cells at 2 Crate showed 92.1 % against 0.2C rate. The cell at -20 $^{\circ}C$ also delivered 82.4 % of the discharge capacity at room temperature.

Syntheses of Novel Bis-Crown Ethers(Ⅰ) : Crown Ethers with Siloxane Moiety (새로운 비스-크라운 에테르류의 합성 (제 1 보) : 실옥산 사슬에 연결된 크라운 에테르)

  • Jang, Seung Hyeon;Kim, Jae Yong
    • Journal of the Korean Chemical Society
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    • v.38 no.5
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    • pp.377-381
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    • 1994
  • New bis-crown ethers containing siloxane chain were synthesized. 1,3-Bis(trimethylsiloxy)-1,3-dimethyl-1,3-dipentaoxacyclohexadecamethyl disiloxane (1) was synthesized by reaction of 3-methylene-16-crown-5 (8) with 1,3-bis(trimethylsiloxy)-1,3-dimethyl disiloxane (10) in the presence of Pt catalyst. 1,1,3,3,5,5-Hexamethyl-1,5-dipentaoxacyclohexadecamethyl trisiloxane (2) was synthesized by the reaction of crown ether (8) with 1,1,3,3,5,5-hexamethyl trisiloxane (11) in the presence of Pt catalyst. 3-Methylene-13-crown-4 (7), 3-methylene-16-crown-5 (8), and 3-methylene-19-crown-6 (9) were synthesized by the reaction of triethylene glycol (3), tetraethylene glycol (4), and pentaethylene glycol (5) respectively with 3-chloro-2-chloro-methyl-1-propene (6) in the presence of NaH.

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Effects of Various Diluents Included in the Resin Matrices on the Characteristics of the Dental Composites (레진 기질에 포함된 희석제들이 치과용 복합 재료의 특성 변화에 미치는 영향)

  • Yoo, Sun-Hwa;Kim, Chang-Keun
    • Polymer(Korea)
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    • v.33 no.2
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    • pp.153-157
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    • 2009
  • The resin matrix in the dental composite is generally composed of 2,2-bis[4-(2-hydroxy-3-methacryloyloxy propoxy) phenyl] propane (Bis-GMA) as a base resin and triethylene glycol dimethacrylate (TEGDMA) as a diluent for the reduction of viscosity. The applications of dental composite were often limited in dentistry due to the relatively large amounts of volumetric shrinkage during polymerization and water uptake caused by the addition of TEGDMA to the resin matrix. In this study, in order to solve problems stemmed from the TEGDMA by reducing amount of diluent added to resin matrix, diethylene glycol dimethacrylate (DEGDMA) and ethylene glycol dimethacrylate (EGDMA) were explored as new diluents. A decrease in the volumetric shrinkage and an increase in the mechanical strength were observed by replacing TEGDMA in the dental composite to DEGDMA (or EGDMA). Reduction in the mechanical strength of the dental composite containing DEGDMA (or EGDMA), was not serious in comparison with that of the dental composite containing TEGDMA after water uptake.

Study on the Effect of Performance Factors on the Finned Tube Type Regenerator for Liquid Desiccant Dehumidification (액체 건조제 제습을 위한 핀튜브형 재생기의 성능인자 영향 연구)

  • Jang, Jun-Oh;Park, Moon-Soo;Kang, Kyung-Tae;Lee, Shin-Pyo;Lee, Jin-Soo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.7
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    • pp.845-852
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    • 2003
  • Liquid desiccant dehumidification system can be used effectively to save energy consumed in air conditioning as an alternative compared with conventional air conditioning systems by reducing latent heat load. The dehumidifier and the regenerator from the heart of this system. The latent part of the cooling load is handled using liquid desiccant. In this study, the experimental regenerator has been designed to study the regeneration characteristics of the aqueous triethylene glycol(TEG) system. The performance factors of the regenerator with finned tube heat exchanger were evaluated by a series of experimental runs. The regeneration process is highly dependent on the liquid desiccant conditions, such as, temperature, concentration and flow rate. In addition, the effects of the inlet air temperature, humidity and flow rate were discussed. Data obtained are useful for design guidance and performance analysis of a regenerator, particularly for a liquid desiccant cooling system.

Dental Restorative Composite Resins Containing Asymmetric Spiro Orthocarbonate for the Reduction of Volumetric Shrinkage (비대칭 스파이로 오르토카보네이트가 포함된 저수축 치아 수복재)

  • 황미선;김창근
    • Polymer(Korea)
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    • v.28 no.4
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    • pp.321-327
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    • 2004
  • The applications of dental restorative composite resins containing 2,2-bis [4-(2-hydroxy-3-me-thacryloyloxy propoxy) phenyl] propane as a base resin, and triethylene glycol dimethacrylate, as a diluent, were often limited in dentistry due to the relatively large amount of volumetric shrinkage that occurs during the curing reaction. In this study, in order to reduce volumetric shrinkage of the current dental restorative composite resin, asymmetric spiro orthocarbonates were synthesized and then the characteristics of resin composites containing them were explored. The volumetric shrinkage of the dental composites containing spiro orthocarbonates was decreased approximately 45%. However, the curing characteristics and mechanical properties of the new dental composites were slightly poor than those of the commercially available dental composite.