• Title/Summary/Keyword: 폴리우레탄 바인더

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Novel Hydroxy-terminated Copolyether-based Polyurethane system for Propellant Binder (새로운 폴리에테르 공중합체 디올(HTPE)을 사용한 추진제용 폴리우레탄 바인더)

  • Yoo Ho-Joon;Song Jong-Kwon;Lee Bum-Jae;Hwang Gab-Sung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.05a
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    • pp.229-232
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    • 2006
  • Two novel synthetic route proposed for Hydro-Terminated Poly(EO-ran-THF) and tri-block(PEC-PTHF-PEG) copolymer by cationic ring-opening polymerization of tetrahydrofuran(THF) and ethylene oxide(EO) and just by polymerization of EO on poly-THF, respectively. Polyurethane was synthesized from random and tri-block HTPE using N-100/IPDI mixture as curing agent, and TPB(Triphenylbismuth) as catalyst. The mechanical properties of resultant polyurethane after mixing with various ratio of isocyanate was also investigated. Finally, the post treatment process of HTPE based on amount of catalyst used in the synthesis was studied, to evaluate the optimum curing condition for the polyurethane propellant binder.

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Cross-linkable Waterborne Polyurethane based on Castor Oil as an Efficient Binder for Silicon Anodes (실리콘 음극용 효과적인 바인더로서 가교결합이 가능한 캐스터 오일 기반의 수분산 폴리우레탄)

  • Lee, Yong Hun;Kim, Eunji;Lee, Jin Hong
    • Applied Chemistry for Engineering
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    • v.32 no.6
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    • pp.607-612
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    • 2021
  • Silicon (Si) is one of the promising active materials to replace the widely used graphite because of its low electrochemical potential and high theoretical capacity. However, Si anodes still face in problems with the huge volume expansion and continuous decomposition of the electrolyte during repeated charge and discharge processes. To address these issues, a cross-linkable waterborne polyurethane (CWPU) based on a bio-oil, castor oil, was prepared and reacted with Tris(2,3-epoxypropyl) isocyanurate (TGIC) linkers, resulting in the formation of a mechanically robust 3D network structure. Si anodes fabricated with the CWPU-TGIC exhibited stable cycling performances and excellent discharge capacities. The results revealed that the CWPU-TGIC binder efficiently accommodates the large volume change for Si anode during charge and discharge cycles. Overall, the eco-friendly binder shows great promise in improving the electrochemical performances of Si anodes.

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.

Novel Polyurethane Binder for Propellant based on Hydroxyl-terminated Copolyether (폴리에테르 공중합체 디올(HTPE)을 사용한 새로운 추진제용 폴리우레탄 바인더)

  • Song Jong-Kwon;Pan Xiao;Lee Bum-Jae;Jeon Jun-Pyo;Hwang Gab-Sung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2005.11a
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    • pp.417-421
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    • 2005
  • Novel two synthetic technics using cationic ring-opening copolymerization of tetrahydrofuran (THF) and ethylene oxide (EO), or just polymerized EO on Poly-THF, could lead to random hydroxyl-terminated poly(EO-ran-THF) or tri-block PEG-PTHF-PEC, respectively. These reactions were carried out using $BF_3O(C_2H_5)_2$ as catalyst, 1,4-butanediol or PTHF as diol initiator. Copolymer structures were controlled by monomer feed ratio, or initial PTHF and EO monomer added amount. The molecular weight of polymer was merely dependant on the ratio of [monomer]/[diol], but not on catalyst. Well-defined random and block hydroxyl-terminated copolyether was found to be as the prepolymer for the propellant binder from the experiment to polyurethane with them.

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A Study on the Physical Properties of PP/Kenaf Felt Composites According to Kenaf Fiber Compositions (케냐프 섬유 조성에 따른 PP/케냐프 펠트 복합체의 물리적 성질 연구)

  • Ku, Sun Gyo;Kim, Youn Cheol
    • Applied Chemistry for Engineering
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    • v.33 no.5
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    • pp.471-476
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    • 2022
  • PP/KF felt was used to load a high content of kenaf fiber (KF) into polypropylene (PP), and polyurethane (PU) was used as a binder. In order to find an optimum composition ratio of the PU binder, the flexural strength of the PP/KF/PU felt composite according to the isocyanate and polyol ratio was evaluated. PP-g-MAH grafted with maleic anhydride (MAH) was applied as a compatibilizer. Tensile, flexural, and impact properties were evaluated to consider changes in mechanical properties of the PP/KF/PU felt composite, and the properties were improved.

The Influence of Soft/Hard Segment Composition and Content on the Abrasion Resistance of Polyurethane Coating Agents (폴리우레탄 코팅제에 있어서 Hard Segment와 Soft Segment의 조성 및 함량변화가 내마모성에 미치는 영향)

  • Son, Hyung-Suk;Jeon, Dong-Geun;Park, Seong-Jin;Kim, Yong-Sung;Kwon, Kwi-Teag;Kim, Ki-Soo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.5
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    • pp.5-12
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    • 2014
  • Weatherstrip coatings of urethane and silicon type which are fit to EPDM and thermoplastic materials are used in sealing systems for automotive applications for noise reduction and high slip characteristics for external applications, respectively. Polyurethane binder was successfully synthesized from poly(butyladiphate)diol (PBAD), poly(tetramethylene)glycol (PTMG) and isocyanate as starting materials. Then, polyurethane coating agents were prepared by using various additives. To investigate effects of segment types on the abrasion resistance of polyurethane coating agents, thin films based on polyurethane coating materials were fabricated. With increasing the amount of hard segment in the coating agent, abrasion resistance, modulus and tensile strength of the coating films were improved, but the elongation of the coating films was decreased.

Properties of High Impact Resisting Mortar based on Polyurethane (폴리우레탄계 고내충격성 모르타르의 물성치 연구)

  • Lee, Chin-Yong;Choi, Dong-Uk;Ha, Sang-Su;Kim, Dong-Wan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.645-648
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    • 2008
  • The expansion joint is an important part of the bridge, but the failure is occurred on the non-shrinkage concrete which is connected to the slab of the bridge and the expansion joint, and the other problem is the release of anchors in expansion joint due to the impact and vibration during the driven car on the bridge, especially an overloaded car. In this study, to overcome the failure of non-shrinkage of concrete, high impact resisting mortar is developed. The high impact resisting mortar shall be a polyurethane material compounded with an aggregate system to develop excellent flexibility characteristics, high load bearing capacity.

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Examination of Color Difference in Elastic Pavement that uses EPDM Chip using Ultraviolet Ray Accelerated Weathering Test (자외선 촉진 내후성 시험에 의한 EPDM Chip을 사용한 탄성포장의 색차분석)

  • Hong, Chang Woo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.1D
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    • pp.91-98
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    • 2011
  • Recently, the usage of elastic paving using EPDM Chip instead of pedestrian sidewalk blocks or permeable concrete used mostly for pedestrian walk, trails and in parks has been increassed as it can absorb impact during walking and produce wide range of colors and designs. However, the properties of EPDM Chip including elasticity and durability are decreased when exposed to ultraviolet ray and scenic paving functions through various colors are lowered due to the yellowing phenomenon. In this study, ultraviolet ray accelerated weathering test has been conducted to analyze the color changes in EPDM Chip and polyurethane resin, which are the main ingredients of elastic paving, when exposed to ultraviolet ray. The color differences are quantitatively analyzed through the color value coordination of the colored space by using the color difference scheme. The experimental results show that the color changes in BL polyurethane resin which is used most frequently at present was larger than that of EPDM Chip. Moreover, the total color difference, ${\Delta}E$, of BC polyurethane resin are 3.162 on the $14^{th}$ day of commencement of acceleration, which is 6 times greater color change resistance against ultraviolet ray than that of BL polyurethane resin with total color difference of 20.639. Therefore, the usage of BC polyurethane resin, which is manufactured to have chain-type molecular structure by using the isocyanate as the HMDI at the time of producing polymer, as binder in elastic paving with EPDM Chip is found to be a highly efficient method of restraining the color changes due to the ultraviolet ray.

Preparation of a Novel PU-LMO Adsorbent by Immobilization of LMO on Polyurethane Foam for Recovery of Lithium Ions (폴리우레탄 폼에 LMO를 고정화하여 리튬이온 회수를 위한 새로운 PU-LMO 흡착제의 제조)

  • You, Hae-Na;Lee, Min-Gyu
    • Clean Technology
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    • v.20 no.3
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    • pp.277-282
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    • 2014
  • In this study, PU-LMO was made by immobilization of LMO on urethane foam (PU) with using an EVA as a binder. PU-LMO was characterized by using X-Ray Diffractometer (XRD) and Scanning Electron Microscopy (SEM). The optimal ratio of EVA/LMO for preparation of PU-LMO was 0.26 gEVA/gLMO. The adsorption of lithium ions by PU-LMO was found to follow the pseudo-second-order kinetic model. The equilibrium data fitted well with Langmuir isotherm model and the maximum removal capacity of lithium ions was 17.09 mg/g. The PU-LMO was found to have a remarkably high selectivity of lithium ions and high adsorption capacity because the distribution coefficient ($K_d$) of lithium ion was higher than those of other metal ions.

Effects of Concrete Materials for the Stream Restoration on Bombina orientalis Embryos (하천복원용 콘크리트 소재가 무당개구리 (Bombina orientalis) 배아에 미치는 영향)

  • Park, Chan Jin;Ahn, Hong Kyu;Gye, Myung Chan;Lee, Tae Hyeong
    • Ecology and Resilient Infrastructure
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    • v.2 no.2
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    • pp.147-153
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    • 2015
  • Various adverse effects can occur due to direct exposure from toxic substances when toxic materials are used to restore river ecosystems. Thus, this study performed analysis on the development of toxicity in terms of survival and abnormality rates using embryos of Bombina orientalis living in Korea to analyze the toxicity of materials used in the river projects. The results showed that the toxicity in cement (C group) was the strongest whereas the toxicity in plant-based polyurethane (P1 group) was the weakest. Survival rates of B. orientalis embryos were 100%, 94 - 95%, 66 - 89% and 0% in control, P1, polyurethane (P2) and C groups, respectively. Abnormalities of embryos were 10.5%, 5.3 - 10.5%, 26.3 - 27.8% and 35.7% in control, P1, P2 and C groups, respectively. Furthermore, we verified that having a sufficient curing time reduced toxic substances that were extracted. The above result suggest that cement and polyurethane hamper the early development of amphibians. In conclusion, it is highly important to review biological safety with respect to the selection of materials used to restore rivers. This study shows the importance of the selection of eco-friendly materials and processes.