• Title/Summary/Keyword: Polyurethane Binder

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Effect of the Binder Content on the Recycling of Scrap Waste Tires (폐타이어 재활용에 있어서 Binder양이 미치는 영향)

  • Kim, Jin-Kuk;Cho, Ha-Na;Lee, Soo-Koo
    • Elastomers and Composites
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    • v.29 no.5
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    • pp.431-435
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    • 1994
  • For recycling of the waste tires, polyurethane binder mixed with the scrapped rubber powders which obtained from tread part of waste tire. This study covered the effect of the binder contents on the mechanical properties of the blend. We also studied the change of the properties after aging on properties compared with those of before aging. The curing reaction of the binder was also investigated in this study. We obtained conclusions the suitable binder content was 15phr in this system.

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Synthesis of Novel Hydroxy-terminated Polyether for Solid Propellent Polyurethane Binder (고체 추진제용 폴리우레탄 바인더를 위한 새로운 폴리에테르 공중합체 디올(HTPE)의 합성)

  • Shin, Bum-Sik;Lee, Bum-Jae;You, Ho-Joon;Park, Young-Chul
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.05a
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    • pp.221-226
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    • 2008
  • Novel synthetic routes were proposed for hydroxy-terminated Poly(EO-co-THF) by Cationic ring-opening copolymerization of Tetrahydrofuran(THF) and Ethylene oxide(EO). It was carried out using Boron trfluoride tetrahydrofuranate($BF_3$ THF complex) as catalyst in the presence of 1,4-butandiol. The resultant products are well-defined linear polyetherpolyol. Polyurethane(TPU) were prepared using resultant polyetherpolyol with IPDI/N-100 as curing agent and TPB(Triphenylbismuth) /MA(Maleic anhydride) mixture as cure catalyst. Mechanical properties of TPU prepared from poly(EO-co-THF) polyol were investigated and compared with polyurethane using ATK HTPE.

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Synthesis of Glycidyl Azido Copolyetherdiol for Solid Propellant Polyurethane Binder (Glycidyl Azido Copolyetherdiol을 이용한 Polyurethane의 합성과 특성분석)

  • Shin, Bum-Sik;Lee, Bum-Jae;Park, Young-Chul;Hwang, Kab-Sung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.231-236
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    • 2008
  • The well-defined copolymers derived from Epichlorohydrin(ECH), Tetrahydrofuran(THF) were synthesized by Cationic ring-opening polymerization(CROP) with 1,4-Butandiol, a initiator, and $BF_3THF$ Complex, a catalyst via Activated monomer mechanism, which could lead to hydroxyl-terminated polyethers. The molecular weight of polymers were dependant on the ratio of [monomer]/[diol], Copolymer structures were controlled by monomers feed ratio, ECH and THF added. This polymers were functionalized from Chlorine group to Azide group using $S_N2$ reaction. Synthesized polymers were found to be as the prepolymer for polyurethane. Polyurethane was synthesized in the presence of N-100/IPDI mixture, a curing agent, and TPB(triphenyl bismuth)/MA(Maleic anhydride) mixture, a catalyst system. The curing behavior and mechanical properties of polyurethane after mixing with various prepolymer’s composition and the molecular weight were studied.

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Synthesis and Properties of Energetic Thermoplastic Polyurethane included Glycidyl Azide Polymer (Glycidyl Azide Polymer를 포함하는 에너지화 열가소성 폴리우레탄의 합성 및 성질)

  • Kim, Hyoung-Sug;You, Jong-Sung;Kweon, Jung-Ok;Noh, Si-Tae;Kwon, Soon-Kil;Lee, Jung-Hwan;Yu, Jae-Chul;Choi, Keun-Bae
    • Journal of the Korea Institute of Military Science and Technology
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    • v.12 no.5
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    • pp.660-666
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    • 2009
  • Thermoplastic polyurethane elastomer(PU-TPE) and energetic thermoplastic polyurethane Elastomer(E-PU-TPE) were prepared from Hexamethylene diisocyanate(HDI), 1,4-BD/AA ester polyol and glycidyl azide polymer(GAP-2400) as an energetic material by the addition polymerization. The PU-TPE and E-PU-TPE were characterized by FT-IR and GPC. Viscometer, DSC and UTM were used to investigate the viscose behavior with a various solvent, thermal properties and mechanical properties of PU-TPE and E-PU-TPE, which are of potential interest for the development of high performance binder of energetic solid propellants. It was found that $M_w$ of PU-TPE and E-PU-TPEs are over 100,000 and decreased with increase of GAP-2400 contents. $T_m$ and ${\Delta}H$ as thermal properties decreased and also tensile strength and elongation at break as mechanical properties decreased with increase of GAP-2400 contents.

Effect of NCO/OH ratio and binder content with micro-AP on HTPB/AP/Al-based propellants mechanical properties

  • Zulfam Adnan;Nurul Musfirah Mazlan
    • Advances in materials Research
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    • v.13 no.2
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    • pp.129-140
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    • 2024
  • This study evaluates the ratio of Toluene di-isocyanate (TDI) functional group isocyanate (NCO) to the binder functional hydroxyl group (OH) in HTPB/AP/Al-based propellants on their mechanical properties, flow rate, and viscosity to determine the limitations of NCO/OH in the composition of solid propellants. The propellants consisted of hydroxyl-terminated polybutadiene (HTPB) polyurethane (PU), aluminum (Al) and tri-modal ammonium perchlorate (AP). The tri-modal AP consisted of 30% of coarse AP, 30% of medium AP, and 8% of fine AP. The ratio of NCO/OH varies from 0.73 to 0.85, with two binder percentages of 10.5% and 12%. An increase in NCO/OH ratio with 10.5% binder provided 20%, 95%, and 8 to 9% increments in UTS, modulus, and hardness, respectively. However, the propellant elongation, density, and flow rate decreased by 170%, 0.2%, and 11-12%, respectively. Viscosity increased 20% based on initial hour reading. The 12% binder provides 27%, 47%, and 5~6% an increment of UTS, modulus and hardness respectively. However, the propellant elongation, density, and flow rate decreased by 47%, 0.17% and 27%, respectively. The viscosity increased 30% based on initial hour reading. This study suggests the NCO/OH value of 0.77 and 10.5~11% binder content in propellant based on the mechanical properties, flow rate, and viscosity for better processing and pot life.

A cross-linking poly(urethane acrylate) binder for Si negative electrode in Li-ion batteries (LIBs)

  • Jang, Suk-Yong
    • Journal of the Korean Applied Science and Technology
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    • v.32 no.4
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    • pp.718-723
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    • 2015
  • For the fabrication of the Si negative electrode in Li-ion batteries (LIBs) containing the cross-linking polymer binder, in this work, the urethane acrylate (UA) oligomer was synthesized via a simple synthetic process. The cross-linked poly(urethane acrylate) (CPUA)/carbone black (CB)/Si composite (CPUA/CB/Si composite) was fabricated through reactions between their reactive vinyl segments in the UA oligomer. Interestingly, the CPUA/CB/Si composite showed better cycle performance than the poly(vinylidene fluoride) (PVdF)/CB/Si composite (PVdF/CB/Si composite) and the polyurethane (PU)/CB/Si composite (PU/CB/Si composite). The CPUA/CB/Si composite had the best lithiation of about $2586mAh\;g^{-1}$. The UA oligomer showed a good compatibility with the electrode materials and current collector after and before a curing process.

Synthesis and Thermal Characteristics of Nano-Aluminum/Fluorinated Polyurethane Binders (나노 알루미늄/불소 함유 폴리우레탄 결합제의 합성 및 열적 특성 연구)

  • Lan, Qianqian;Kim, Jin Seuk;Kwon, Younghwan
    • Journal of the Korean Society of Propulsion Engineers
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    • v.20 no.5
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    • pp.40-50
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    • 2016
  • Energetic plasticizers containing explosophore groups such as $-NO_2$, $-ONO_2$, and $-N_3$ group are susceptible to impact, shock, heat, etc, finally deteriorating the insensitivity of PBXs. In this study, in an attempt to investigate the feasibility of replacing sensitive explosophore groups to fundamentally inactive but potentially (latent) energetic fluorine group which was known to have an exothermic thermite reaction with aluminum, nano-aluminum/fluorinated polyurethane binders were prepared by simultaneous polyurethane and catalyst-free azide-alkyne click reaction in the presence of nano-aluminum. Thermal characteristics of nano-aluminum/fluorinated polyurethane binders were monitored by using DSC with high pressure crucible pan.

An Analysis of Coherence and Resilience Depending on Materials Mixing Ratio in Elastic Landscape Pavement (조경용 탄성포장의 재료 배합비에 따른 결합력과 탄성분석)

  • Park, Won-Kyu
    • Journal of the Korean Institute of Landscape Architecture
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    • v.38 no.5
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    • pp.93-101
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    • 2010
  • The demand for elastic pavement, providing comfort for pedestrians is expected to increase continuously but the lack of a standard for materials mixing ratio, that is, the optimal mixing ratio between ERDM chip and polyurethane binder, is still in a trial and error stage. This study aimed at recommending an optimal mixing ratio for elastic landscape pavement through a coherence and resilience test depending on ratio. The test result is outlined as follows. In a tensile strength test, samples B and C indicated a close positive relationship between the binder mixing ratio and tensile strength, indicating that the higher the mixing ratio the higher the tensile strength. In a hardness test, none of samples A, B or C indicated a statistical interrelationship between the binder mixing ratio and hardness. That is, the hardness of the elastic pavement material remained unchanged, irrespective of the binder mixing ratio. In a resilience lest, Samples A and B indicated a close negative interrelation between mixing ratio and resilience, indicating that the higher the mixing ratio, the lower the resilience. Upon analyzing the optimal mixing ratio based on test results, an increase in tensile strength began to slow at a 20% mixing ratio, while resilience began to reduce rapidly at 22%, Thus the optimal range for a mixing ration appeared to be 20~22%. The outcome of this study could to provide guidance for improving the elasticity and stability of elastic pavement.

Effect of Chemical Structures and Added Amounts of Humectants in Pigment Ink on Touch of Dyed Fabrics (안료 잉크 내 휴멕턴트의 화학구조와 첨가량이 염색 직물의 태에 미치는 영향)

  • Kim, Hyungjin;Park, Seongmin;Kwon, Woong;Jeong, Euigyung
    • Textile Coloration and Finishing
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    • v.34 no.1
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    • pp.10-19
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    • 2022
  • Humectants are chemical compounds which added to water based pigment inks for DTP (Digital Textile Printing) to prevent evaporation of water. The humectants usually have diol or triol type chemical structures and their -OH groups have possibility to react with functional groups of the binder polymers, such as ester, carboxylic acid, and urethane groups, acting as a crosslinking agent. The crosslinking reactions between polymer binders and humectants in inks can affect touch of the printed fabrics. In this regard, this study aims to investigate effect of chemical structures and added amounts of humectants in pigment ink on touch of dyed fabrics by using 1,6-hexanediol, ethylene glycol, diethylene glycol, and 1,4-buthanediol with various amounts added to the mixture of a black pigment and a polyurethane type binder. Then, color, rubbing strength, touch of the fabrics dyed with the prepared pigment inks were evaluated.

A Study on Organic-Inorganic Hybrid Sound Absorbing Materials Using by Recycling Gypsum (재활용 석고 부산물을 이용한 유무기 하이브리드 흡음재 개발 연구)

  • Shin, Hyun-Gyoo;Jeon, Bo-Ram;Ha, Joo-Yeon;Jeon, Chan-Soo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.4
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    • pp.481-487
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    • 2017
  • The purpose of this study is to develop the hybrid sound-absorbing materials that is made from organic polyurethane sponge impregnated with inorganic binder solutions. The inorganic slurry which is made from ${\alpha}$-hemihydrate gypsum mixed with 60% water, and various additives including plasticizer are used as binder. The test specimens are prepared and tested for sound absorption performance by the impedance tube methods. From the test results, noise reduction coefficient(NRC) of development materials specimen bound by the inorganic binder slurry is 0.41. They are 2 times or more higher than commercial products specimens bound by organic materials only which have NRC values in the range of 0.14 to 0.28. The polyurethane sponge specimens impregnated with inorganic gypsum slurry binder have a good balance between performance and cost, and have proper properties in density, thermal conductivity, non-combustible, and absence of harmful substances as sound-absorbing internal boards for noise barrier wall. It is apparent that the good sound absorption materials can be produced according to the optimum mix design that is recommended from this study.