• Title, Summary, Keyword: polyurethane

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Autoignition of Urethane Foam to be Used as the Insulator of the Household Refrigerator

  • Choi, Jae Wook;Mok, Yun Soo
    • International Journal of Safety
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    • v.1 no.1
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    • pp.47-51
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    • 2002
  • This study was performed by measuring the minimum ignition temperature of polyurethane form recovered from the recycling process of the end-of-life home appliances. The critical ignition temperature of polyurethane form was lower as the size of the sample vessel was increased, and that of polyurethane form using cyclopentane as the forming agent was relatively lower than the polyurethane form using CFC and the combustion of cyclopentane-polyurethane form occurred fiercely. It is considered that the recycling process of end-of-life home appliances using cyclopentane-polyurethane form as the insulator would require a special fire and dust explosion prevention measures since there exists a high potential hazard of fire and dust explosion during crushing and storage processes.

Synthesis of Aminosilane treated Waterborne Poly Urethane/Epoxy Hybrid Resin used for Loudspeaker Damper (스피커 댐퍼용 아미노실란 처리 수분산 폴리우레탄/에폭시 하이브리드 수지의 합성)

  • Choi, Hyun-Seuk;Choi, Dong-Ho;Park, Ju-Yong;Huh, Man-Woo
    • Textile Coloration and Finishing
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    • v.29 no.1
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    • pp.25-36
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    • 2017
  • This study worked on the synthesis of waterborne polyurethane/epoxy hybrid resins containing aminosilane compound to replace conventional phenol resins used for a coating material for loudspeaker dampers, which are not harmful to human being. Waterborne polyurethane resins were synthesized from two diisocyanate of 4,4'-diphenylethane diisocyanate and toluene diisocyanate, two polyols of polyester polyols(PEP), polycarbonatediol(PCD), including and anionic center of dimethylol butanoic acid, a chain extenders of ethylenediamine(EDA), and a neutral agent of triethylamine. Synthesized polyurethane resins and commercially available bisphenol A type waterborne epoxy resin were blended in weight ratios of 80:20 to prepare polyurethane/epoxy hybrid resins. The synthesized waterborne polyurethane/epoxy hybrid resins were reacted with aminosilane compound to improve mechanical properties. Aminosilane-treated polyurethane /epoxy hybrid resins showed better mechanical properties.

Immobilization of Rhizopus chinesis using Polyurethane Foams (Polyurethane Foam을 이용한 리파아제 생산 균주 Rhizopus chinesis의 고정화)

  • 주지선;류희욱장용근
    • KSBB Journal
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    • v.7 no.3
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    • pp.172-178
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    • 1992
  • A simple and effective method has been developed for the immobilization of lipase producing Rhizopus chinensis on polyurethane foam. In this method, the fungal cells with 1, 3 specific lipase in there inside are immobilized within the foam matrix. Four types of commercially available polyurethane foam were tested. The ultimate purpose of the process is to produce low-cost biocatalysts for lipase-catalyzed reactions, which are being increasingly used for industrial applications. Effects of several parameters were studied on the cell loading and the hydrolytic activity of intracellular lipase after acetone drying. These parameters were the type, size, and amount of polyurethane foam. In all the cases, the intracellular lipase activity obtained with the foam was approximately twice greater than that obtained in the absence of the foam.

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Effect of Addition of Pentaerythritol Triacrylate on the Properties of Waterborne Polyurethane (수분산 폴리우레탄의 물성에 미치는 Pentaerythritol Triacrylate의 첨가 효과)

  • Shin, Yong Tak;Hong, Min Gi;Choi, Jin Joo;Lee, Won Ki;Yoo, Byung Won;Lee, Myung Goo;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.49 no.4
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    • pp.411-416
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    • 2011
  • NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), polycarbonate diol(PCD) and dimethylol propionic acid(DMPA). Subsequently, acrylic terminated prepolymers were prepared by capping the NCO groups of polyurethane prepolymers with different moles of pentaerythritol triacrylate (0~0.024 moles) as a acrylate monomer. The average particle size of the acrylic terminated polyurethane solutions was increased with increasing PETA contents. Also, the prepared coating films showed better abrasion resistance and pencil hardness than pure waterborne polyurethane.

A Study on the Standardization of the Polyurethane Soft Foam for Thermally Insulated Container (냉동 컨테이너용 경질 폴리우레탄 폼 단열재 표준연구)

  • Lee, Joon-Hyuk;Park, Yong-Geun;Joo, A-Ram;Jung, Yong-An;Lee, Soon-Hong
    • Journal of the Korean Society of Safety
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    • v.32 no.1
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    • pp.108-114
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    • 2017
  • According to an increase in demand for polyurethane soft foam for thermally insulated containers, the purpose of this study is based on redefining existing rigid polyurethane foam insulation KS standard which has been limited to building material-based authentication techniques. Since there are arising concerns of consumer rights and safety due to humidifier fungicides and urethane track incidents, there are elements to be further researched on rigid polyurethane foam insulation for refregerated containers. Thus, we reviewed the prior standards for rigid polyurethane foam insulation and verified the validity of certification testing method for the new standard with self-foamed polyurethane.

A Study on Noxious Gases Analysis of Polyurethane foams (Polyurethane foam의 유해가스 분석에 관한 연구)

  • 이창우;김정환;현성호
    • Fire Science and Engineering
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    • v.14 no.2
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    • pp.7-13
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    • 2000
  • We had investigated thermal stability, Ignition temperature and fire gas for polyurethane foams used for manikin, cushion and interior finishing material. Decomposition of polyurethane foams with temperature was investigated using a DSC and the weight loss with temperature increase using a TGA in order to find the thermal hazard of polyurethane foams, and the ignition temperature of polyurethane foams according to species. We studied constant temperature among ignition temperature measuring methods. In addition, noxious gases for polyurethane foams according to combustion condition were analyzed using gas analyzer and GASTEC. As results, initial decomposition temperature of polyurethane foam used for interior finishing material was lower than those for manikin and cushion, and exothermic energy was higher. Ignition temperature of polyurethane foam of interior finishing material was $420^{\circ}$. All of combustion forms at $427^{\circ}$ and under were smoldering combustion, and it was combustion at $500^{\circ}$. As furnace temperature was increased, concentration of noxious gases such as carbon oxide, carbon dioxide, and hydrogen cyanide was increased. And nitrogen oxide at combustion condition($500^{\circ}$) was over 10 ppm.

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Enhanced Production of Shikonin by Using Polyurethane-entrapped Lithospermum erythrorhizon Cells (Polyurethane Foam 에 포괄시킨 Lithospermum erythrorhizon 세포에 의한 Shikonin 생산)

  • Taek, Seo-Weon;Liu, Jang-Ryol;Park, Young-Hoon
    • Microbiology and Biotechnology Letters
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    • v.17 no.4
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    • pp.343-348
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    • 1989
  • Production of shikonin derivatives by Lithospermum erythrorhizon cells by using polyurethane foam was invesliigated. Shikonin derivatives were effectively adsorbed mostly by phase distribution to polyurethane matrices and their production increased significantly compared to the suspension culture. The enhanced production of shikonin was probably due to more facilitated cell to cell con-tact and lowered intracellular shikonin concentration, both of which are known to be favorable for plant secondary metabolite production. In order to improve the process productivity, tell culture was conducted under various culture conditions: Of them, Schenk and Hildebrandt medium containing indole-3-acetic acid (1.75mg/ι) and kinetin (0.1mg/ι) was considered most appropriate for shikonin production. Production of shikonin increased about 4.5 times in the Schenk and Hildebrandt medium containing indole-3-acetic acid (1.15mg/ι) and kinetin (0.1mg/ι) when compared to the same medium containing p-chlorophenoxyacetic acid (2.0mg/ι) and kinetin (0.1mg/ι). When poly-urethane was used as the support material, a single-stage system was more preferred to the conventional two-stage culture system in terms of shikonin productivity.

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Fire-Retardation Properties of Polyurethane Nanocomposite by Filling Inorganic Nano Flame Retardant (폴리우레탄 복합체의 무기난연재료 충전에 의한 난연 특성)

  • Son, Bok-Gi;Hwang, Taek-Sung;Goo, Dong-Chul
    • Polymer(Korea)
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    • v.31 no.5
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    • pp.404-409
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    • 2007
  • Polyurethane nanocomposites with inorganic nano fillers for the improvement thermal stability were prepared by the urethane reaction. Fire retardation properties of polyurethane nanocomposites were investigated by cone calorimeter and limited oxygen index (LOI). Maximum heat release rate of MMT-PU and $Bi_2O_3-PU$ polyurethane nanocomposites were decreased as 50% than polyurethane matrix and fire retardation properties of $MMT/Bi_2O_3-PU$ nanocomposte had the best improvement. The LOI of polyurethane nanocomposites also were improved as filling fillers in the nanocomposites over 20. The maximum heat release rates of MMT-PU, $Bi_2O_3-PU\;and\;MMT/Bi_2O_3-PU$ polyurethane nanocomposites were 764, 707, $635kW/m^2$, respectively and $MMT/Bi_2O_3-PU$ polyurethane nanocomposite exhibited the highest value of fire-retardant. We confirmed that polyurethane nanocomposites improved the fire retardation properties.

Studies of Annealing Effect on the Properties of the Rigid Polyurethane (열처리에 따른 경질 폴리우레탄의 물성 변화 연구)

  • Kang S. J.;Jung H. C.;Kim W. N.;Lee Y. B.;Choe K. H.;Hong S. H.;Kim S. B.
    • Journal of the Korean Institute of Gas
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    • v.2 no.4
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    • pp.18-24
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    • 1998
  • Polyurethane (PU) synthesized from 4,4'-diphenylmethane diisocyanate having high functionality (f=2.9) and polyester polyol have been investigated by differential scanning calorimeter (DSC), dynamic mechanical thermal analyzer (DMTA), and Fourier transform infrared spectroscope (FT-IR). From the DSC measurement of polyurethane, a single transition temperature ($T_g$) was observed. This result indicates that polyurethanes synthesized in this work have homogeneous network structure due to high functionality of diisocyanate. It was also found that the $T_g$ of polyurethane was increased as hard segment content was increased. The results from DMTA measurement are consistent with DSC results. In order to investigate the effect of thermal annealing on the $T_g$ of polyurethane, the samples were annealed at various annealing conditions. $T_gs$ of polyurethanes were found to increased with annealing temperature. From swelling experiment and FT-IR studies, it was found that the $T_g$ was increased as crosslinking density of polyurethane was increased.

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A Fundamental Study on the Properties of Polyurethane Concrete (폴리우레탄 콘크리트의 기초적 성상에 관한 연구)

  • 강재홍;조영국;소승영;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.253-259
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    • 1996
  • The purpose of this study is to investigate the fundamental properties of polyurethan concrete. Polyurethane must be expanded by means of a blowing agent during polymerization. Chemical blowing is caused by the reaction water with isocyanate. Binder system for polyurethane concrete is based on polyol and isocyanate with catalyst, surfactant, and methyl chloride. Polyurethane concretes are prepared with various grading of aggregate, and tested for compressive, flexural strengths, flow test, foaming multiple proportion, working life, condition of surface, distirbution of aggregate. From the test results, the foaming of polyurethane concretes are affceted by amount and grading of aggregate. Workability increases with raising amount of methy chloride and working life reduced according to amount of catalyst. The mix proportion of B with methyl chloride of 1% and catalyst of 0.1g for polyurethane concrete is recommended in consideration of strengths, condition of surface and balance between cost and performance.

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