• Title/Summary/Keyword: Polyurethane

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Dyeing properties of acid dyeable polyurethane (산성염료 가염형 폴리우레탄의 염착 특성 연구)

  • Kim, Dong-Bin;Jeong, Lee-Seok;Go, Jun-Seok
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.45-46
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    • 2008
  • Dyeing and fastness properties of acid dyeable polyurethane have been compared with those of regular polyurethane. The Exhaustion and color strength on acid dyeable polyurethane was relatively better than regular polyurethane at heavy depth dyeing. The washing fastness properties of acid dyes on acid dyeable polyurethane were similar to those of regular polyurethane.

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Mechanical Properties of Polyurethane Foam Prepared from Prepolymer with Resin Premix (Prepolymer와 Resin Premix로 부터 제조된 Polyurethane Foam의 기계적 성질)

  • Kim, Tae Sung;Park, Chan Young
    • Elastomers and Composites
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    • v.48 no.3
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    • pp.241-248
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    • 2013
  • Polyester type polyurethane foam has low hydrolysis resistance. It was overcome with addition of acrylic polyol by quasi prepolymer method. Tensile strength and hardness of polyurethane foam contained acrylic polyol was increased with increasing of acrylic polyol contents. But split tear strength and tear strength was slightly changed. Hydrolysis resistance of polyurethane foam was measured by loss % of tensile strength. It was improved with increasing of acrylic polyol contents from 25.5g to 102g.

The Effect of Aggregation States on ionic Conductivity of Stolid Polymer Electrolytes Based on Waterborne Polyurethane

  • Bae, Sang-Sik;Jo, Nam-Ju
    • Macromolecular Research
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    • v.9 no.6
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    • pp.332-338
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    • 2001
  • Waterborne polyurethane as a new polymer electrolyte was synthesized by using relatively hydrophilic polyols. The morphology of polyurethane was changed as it was dispersed in water. In contrast to polyurethane ionomer, waterborne polyurethane did not form an ionic cluster but produced a binary system composed of hydrophilic and hydrophobic groups. In the colloidal system, the former and the latter existed at outward and inward, respectively. Waterborne polyurethane was prepared from poly(ethylene glycol) (PEG) /poly(propylene glycol) (PPG) copolymer, 4,4'-diphenylmethane diisocyanate(MDI), ethylene diamine as a chain extender, and three ionization agents, 1,3-propane sultone, sodium hydride and lithium hydroxide. PEG/PPG copolymer was used for suppressing the crystallinity of PEG and N-H bond was ionized for increasing the electrochemical stability of polyurethane. Low molecular weight poly(ethylene glycol) and poly(ethylene glycol dimethyl ether) (PEGDME) were used as plasticizers. DSC, FT-IR and $^1$H-NMR of the waterborne polyurethane were measured. Also, the ionic conductivity of solid polymer electrolytes based on waterborne polyurethane and various concentrations of low molecular weight poly(ethylene glycol) or PEGDME were measured by AC impedance.

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Preparation of Silylated Waterborne Polyurethane/Silica Nanocomposites Using Colloidal Silica (Colloidal Silica를 이용한 Silylated Waterborne Polyurethane/Silica Nanocomposite의 제조)

  • Hong, Min Gi;Shin, Yong Tak;Choi, Jin Joo;Lee, Won Ki;Lee, Gyoung Bae;Yoo, Byung Won;Lee, Myung Goo;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.48 no.5
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    • pp.561-567
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    • 2010
  • Silylated waterborne polyurethane was synthesized by capping the NCO groups of polyurethane prepolymer, prepared from isophrone diisocyanate, poly(tetramethylene glycol) and dimethylol propionic acid, with aminopropyl triethoxysilane. Subsequently, it was mixed with colloidal silica to prepare silylated waterborne polyurethane/silica nanocomposites. The average sizes of nanocomposite particles, measured by dynamic light scattering, showed almost the same value, irrespective of increasing silica content. However, the prepared nanocomposites showed better thermal stability than pure waterborne polyurethane.

Effects of surface modification with hydroxyl terminated polydimethylsiloxane on the corrosion protection of polyurethane coating

  • Jeon, Jae Hong;Shon, MinYoung
    • Corrosion Science and Technology
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    • v.13 no.5
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    • pp.170-177
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    • 2014
  • Polyurethane coating was designed to give a hydrophobic property on its surface by modifying it with hydroxyl terminated polydimethylsiloxane and then effects of surface hydrophobic tendency, water transport behavior and hence corrosion protectiveness of the modified polyurethane coating were examined using FT-IR/ATR spectroscopy, contact angle measurement and electrochemical impedance test. As results, the surface of polyurethane coating was changed from hydrophilic to hydrophobic property due primarily to a phase separation tendency between polyurethane and modifier by the modification. The phase separation tendency is more appreciable when modified by polydimethylsiloxane with higher content. Water transport behavior of the modified polyurethane coating decreased more in that with higher hydrophobic surface property. The decrease in the impedance modulus ${\mid}Z{\mid}$ at low frequency region in immersion test for polyurethane coatings was associated with the water transport behavior and surface hydrophobic properties of modified polyurethane coatings. The corrosion protectiveness of the modified polyurethane coated carbon steel generally increased with an increase in the modifier content, confirming that corrosion protectiveness of the modified polyurethane coating is well agreed with its water transport behavior.

A Study on the Mechanical Properties of Composite Materials of Polyurethane Resin and CuO (PUR/CuO 복합재료의 기계적 특성 연구)

  • Kim, Eun-Bong;Koo, Su-Jin;Jeong, Sang-Gu;Kim, Seok-Hyeon
    • Journal of Power System Engineering
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    • v.18 no.5
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    • pp.106-114
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    • 2014
  • For the purpose of development of polyurethane sealing material, polyurethane resins reinforced with CuO were prepared from polyol and MOAC(4,4'-Methylenebis(2-chlorobenzeneamine)). And the effects of compositions on the mechanical properties of the reinforced polyurethane resin were experimentally examined. The polyurethane resin got to be thermally decomposed at $260^{\circ}C$ and completely carbonized around $500^{\circ}C$. Tensile strength, elongation and hardness of the polyurethane resin increased with the content of MOCA. CuO was uniformly dispersed in the polyurethane resin by 1 minute's ultrasonic radiation. Tensile strength, elongation and hardness of the polyurethane resin reinforced with CuO increased with the content of CuO. Tensile strength and hardness of the reinforced polyurethane resin increased with particle size of the CuO, but elongation decreased. CuO showed higher tensile strength and hardness than any other additives, and lowest elongation.

Flame Retardant Properties of Polyurethane by the Addition of Phosphorus Compounds (인계 화합물의 첨가에 의한 폴리우레탄의 난연성)

  • Chung, Yeong-Jin
    • Fire Science and Engineering
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    • v.20 no.4 s.64
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    • pp.110-115
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    • 2006
  • Polyurethane(PU) was mixtured by the treatment with flame retardants such as Tri(chloroisopropyl) phosphate(TCPP), Triethyl phosphate(TEP) and Trimethyl phosphate(TMP) at about $90^{\circ}C$. Rigid polyurethane foam was produced using the mixured products as flame retardants. The mechanical property and flammability of rigid polyurethane was investigated. The mixtured polyurethane shows reduced flammability over virgin polyurethane. Mechanical strength of mixtured polyurethane also shows as high as that of virgin polyurethane. In order to evaluate flame retardant properties of the mixtured polyurethane foams, heat release rate(HRR) of the foam was measured by cone calorimeter. Scanning electron micrograph of mixtured PU shows uniform cell morphology as virgin PU.

Fire Retardancy of Recycled Polyurethane Foam Containing Phosphorus Compounds (인계화합물을 포함한 재활용 폴리우레탄폼의 난연성)

  • Chung, Yeong-Jin
    • Journal of the Korean Applied Science and Technology
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    • v.24 no.2
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    • pp.182-189
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    • 2007
  • Used polyurethane was chemically degraded by treatments with flame retardants such as tris(3-chloropropyl) phosphate (TCPP), triethyl phosphate (TEP), and trimethyl phosphate (TMP). The structure of degraded products (DEP) was analyzed by FT-IR and P-NMR and it turned out to be phosphorus containing oligourethanes. Rigid polyurethane foam was produced by using the degraded products (DEP) as flame retardants. The flammability of recycled rigid polyurethane was investigated. The recycled polyurethane shows a reduced flammability over virgin polyurethane. In order to evaluate flame retardant properties of the recycled polyurethane foams with various amounts of DEP, the combustion parameters of the foam was measured by a cone calorimeter. Scanning electron micrograph of recycled PU shows the same uniform cell morphology as virgin PU.

Synthesis and Characterization of Polyurethane Elastomer (Polyurethane Elastomer의 합성 및 특성)

  • Jeong, Booyoung;Cheon, Jungmi;Chun, Jeahwan;Mok, Dongyoub;Lee, Hakmung
    • Journal of Adhesion and Interface
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    • v.10 no.4
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    • pp.169-173
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    • 2009
  • In this study, We were studied on the properties of polyurethane elastomer containing the polyol, chain extender and isocyanate in polyurethane elastomer. Polyurethane elastomer had the best properties with poly(tetramethylene) glycol for in-line skate wheel. With more incorporation of chain extender content in polyurethane elastomer, tensile strength and hardness increased and elongation decreased. And then properties of polyurethane elastomer with the bulky type isocyanate had better than the flexible type isocyanate.

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Effect of Addition of Pentaerythritol Triacrylate and Silane Coupling Agents on the Properties of Waterborne Polyurethane (Pentaerythritol Triacrylate와 실란커플링제의 첨가가 수분산 폴리우레탄의 물성에 미치는 영향)

  • Shin, Yong Tak;Hong, Min Gi;Kim, Byung Suk;Lee, Won Ki;Yoo, Byung Won;Lee, Myung Goo;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.191-197
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    • 2012
  • Acrylic terminated polyurethane prepolymers were synthesized by capping the NCO groups of polyurethane prepolymers, prepared from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA), with pentaerythritol triacrylate (PETA). Subsequently, silylated acrylic terminated prepolymers were prepared by capping the NCO groups of acrylic terminated polyurethane prepolymers with different types of silane coupling agents, glycidoxypropyl trimethoxysilane (GPTMS) or aminopropyl triethoxysilane (APS). The average particle size of pure waterborne polyurethane solution, measured by the dynamic light scattering method, was increased from 14.3 nm to 208.6 nm by adding PETA and APS. Also, the coating film of silylated acrylic terminated waterborne polyurethane showed better abrasion resistance and pencil hardness than that of pure waterborne polyurethane.