• Title, Summary, Keyword: polyurethane

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The Properties of Commercial Polyurethane Coated Fabrics (시판되는 폴리우레탄 코팅포의 물성)

  • 이정순;신혜원
    • Journal of the Korean Society of Clothing and Textiles
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    • v.21 no.8
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    • pp.1346-1352
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    • 1997
  • The purpose of this study was to help the consumer as well as the producer by investigating the properties such as tensile strength, extention, tear strength, wrinkle recovery, drapability, bending property, moisture regain, and shrinkage on commercial polyurethane coated fabrics. Seven commercial polyurethane coated fabrics having various base fabrics were used. The performance properties of base fabrics and polyurethane coated fabrics were measured. The relationships between base fabrics and polyurethane coated fabrics on the performance properties were identified. It was concluded that the properties of polyurethane coated fabric mainly depend on the characteristics of base fabric. Therefore the proper use of base fabric is recommended in order to improve the performance of polyurethane coated fabric.

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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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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.

Waterborne Polyurethane Skin Resin Used in the Fabrication of Synthetic Leather Adhesive (합성피혁 스킨용 폴리우레탄 수분산체의 제조 및 primerless 접착 특성 연구)

  • Kim, Eun Ji;Paik, In Kyu;Park, Jae Hyung
    • Textile Science and Engineering
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    • v.54 no.1
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    • pp.28-35
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    • 2017
  • Shoes, made up of an upper shoe, insole, and outsole, are manufactured by adhering each of the parts together. It has been proven that pre-treating each of these parts greatly improves the adhesive strength when adhering them together. However, harmful materials such as volatile organic compounds (VOCs) are often emitted from organic solvents during pre-treatment, causing environmental concerns such as air pollution in the workplace. Therefore, this study was conducted to develop a water-based polyurethane skin resin for fabricating a synthetic leather and textile adhesive that has greater adhesive strength and does not require pre-treatment. To achieve this, two waterborne polyurethane solutions, one with excellent thermal resistance and light fastness (waterborne polyurethane A) and the other with high adhesive strength (waterborne polyurethane B), were mixed to impart the superior characteristics of each to a third waterborne polyurethane solution. Through this approach, we were able to successfully fabricate an excellent waterborne leather polyurethane resin with ethylene vinyl acetate (EVA) for midsoles (peel strength: 2.9 kgf/cm) and for rubber out-soles (peel strength: 2.4 kgf/cm) without using pre-treatment.

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 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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Study on Properties of Bio Polyurethane-ePTFE Membrane Fabrics at -20 Degrees Celsius (아웃도어용 바이오 폴리우레탄-ePTFE 멤브레인 직물의 영하 20도에서 특성 연구)

  • Seo, Dae-kyung;Lee, Jang-hun;Hong, Jae-guen;Kweon, Oh-kyung;Kim, Hyo-jung
    • Textile Science and Engineering
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    • v.55 no.4
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    • pp.247-254
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    • 2018
  • This paper intends to study the characteristics of hybrid film fabrics composed of a $5-20{\mu}m$ bio-polyurethane layer and an ePTFE layer in low-temperature conditions. Bio-polyurethane resin was coated on the ePTFE fabric using direct coating methods. The water pressure properties increased with increasing polyurethane layer thickness, while water vapor permeability decreased. In comparison with ePTFE laminated fabric, hybrid film laminated fabrics are effective in enhancing mechanical properties (tensile strength, tear strength) and heat retention. In addition, the decrease in overall properties with respect to the flex resistance under low temperature was offset by the coated bio-polyurethane layer.