• Title/Summary/Keyword: melamine foam

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Sound Absorbing Melamine Foam: A Strong Environmental Friendly Tendency Opposing Glass Fiber of Room Using in China

  • Yan, Xiang
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2010.05a
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    • pp.462-462
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    • 2010
  • Glass fiber is widely used in architectural acoustics or building acoustics for sound absorption since it was introduced into China for about 50 years. But recent years, with people pay more attentions to the air cleansing and their health which may be affected by the tiny fiber of the glasswool, a voluntary tendency opposing glass fiber of room using is gradual appeared in China. This paper discusses both the main opinions towards the question whether there are harmful impacts on people health from glassfiber, and the application circumstance of it's applying in china. This paper focuses on another substitute sound absorbing material, melamine foam, to discuss the strong environmental friendly tendency opposing glass fiber of room using in China now.

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Fabrication of Nitrogen Self-Doped Porous Carbons from Melamine Foam for Supercapacitors (슈퍼커패시터용 멜라민 폼으로부터 질소가 자가 도핑된 다공성 탄소 재료의 제조)

  • Lee, Byoung-Min;Chang, Hyeong-Seok;Choi, Jae-Hak;Hong, Sung-Kwon
    • Korean Journal of Materials Research
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    • v.31 no.5
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    • pp.264-271
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    • 2021
  • Porous carbons have been widely used as electrode material for supercapacitors. However, commercial porous carbons, such as activated carbons, have low electrochemical performance. Nitrogen-doping is one of the most promising strategies to improve electrochemical performance of porous carbons. In this study, nitrogen self-doped porous carbon (NPC) is prepared from melamine foam by carbonization to improve the supercapacitive performance. The prepared NPC is characterized in terms of the chemical structures and elements, morphology, pore structures, and electrochemical performance. The results of the N2 physisorption measurement, X-ray diffraction, and Raman analyses reveal that the prepared NPC has bimodal pore structures and pseudo-graphite structures with nitrogen functionality. The NPC-based electrode exhibits a gravimetric capacitance of 153 F g-1 at 1 A g-1, a rate capability of 73.2 % at 10 A g-1, and an outstanding cycling ability of 97.85 % after 10,000 cycles at 10 A g-1. Thus, the NPC prepared in this study can be applied as electrode material for high-performance supercapacitors.

Synthesis of Melamine Phosphate-Polyurethane Composite Foam Blown by Water and Characterization of Its Thermal Properties (H2O로 발포된 멜라민포스페이트-폴리우레탄폼 복합체 합성과 열적 특성 분석)

  • Park, Kyeong-Kyu;Lee, Sang-Ho
    • Polymer(Korea)
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    • v.38 no.4
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    • pp.441-448
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    • 2014
  • Polyurethane/melamine phosphate composite foam (MP-PUF) was prepared from poly(adipate)diol/melamine phosphate composite (f=2), polyether-polyol (f=4.6), and PMDI (f=2.5). The thermal properties of MP-PUF such as morphology, closed-cell content, thermal conductivity, and thermal stabilities were characterized. Water was used as a blowing agent, and the composition of melamine phosphate (MP) was maintained at $1.43{\pm}0.3wt%$ of MP-PUF. As the content of water increased, the thermal conductivity of pure polyurethane foam (PUF) decreased, whereas the thermal conductivity of MP-PUF increased. The thermal stabilities of the PUF and the MP-PUF were maximized at 5 php $H_2O$, and then decreased at the higher $H_2O$ contents. The thermal stabilities of MP-PUF were greatly enhanced due to the synergetic effect of MP and urea, which was generated during the blowing process. The temperature of 50% residual mass of MP-PUF increased to $370{\sim}450^{\circ}C$ and the temperature of 30% residual mass exceeded over $700^{\circ}C$. Compared to the PUF, the temperature of 50% residual mass and 30% residual mass were higher than 25 and $70^{\circ}C$, respectively.

Flammability of insulators for railroad vehicles (차량용 단열재의 종류에 따른 난연성 평가)

  • Lee Duck-Hee;Lee Cheul-Kyu;Jung Woo-Sung;Kim Sun-Ok;Back Min
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.477-482
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    • 2004
  • New materials are being considered for insulator of railroad vehicles. Because people want more environmental material than glass fiber, there are certain needs of finding safe and economical insulating material. We checked the flammability of some kinds insulators such as PE foam, neoprene rubber foam. melamine foam and glass fiber. You could find out the characteristics such as oxygen index. optical smoke density, toxicity index of that insulators.

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Cooling Effect of a Heated Porous Plate by Droplets Impingement - A Preliminary Study (가열 상태의 다공성 판에 충돌하는 액적의 냉각 성능에 대한 기초 연구)

  • Ryu, S.U.;Kim, W.S.;Lee, S.Y.
    • Journal of ILASS-Korea
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    • v.14 no.1
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    • pp.20-27
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    • 2009
  • In the present work, effects of spray characteristics (droplet size and velocity) on the temperature variation of a heated porous plate (Melamine foam) have been investigated through a series of experiments. Based on the measured data, time required to cool down the hot porous material turned out to be shorten by doing with the smaller droplet size and/or smaller impinging velocity. In particular, the droplet size effect is more prominent than the impinging velocity. The cooling performance in the porous material is directly proportional to the penetration velocity.

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(An) experimental study on the development of lightweight concrete using the PCM (PCM 혼입 경량기포콘크리트 패널 개발을 위한 기초적 연구)

  • Lim, Myung Kwan;Enkhbold, Odontuya;Kim, Young Ho;Choi, Dong Uk
    • KIEAE Journal
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    • v.14 no.4
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    • pp.133-138
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    • 2014
  • The present study was carried out to assess the basic material properties and thermal behavior of light-weight foamed concrete panel mixed with PCM (Phase Changing Material). To do so, this study fabricated light-weight foamed concrete (1.0kg/m3) in pre-foaming method and mixed it with PCM micro capsule of 1-dodecanol and melamine to examine its physical and thermal properties. The results confirmed strength reinforcement effect by proper replacement ratio of fly-ash, which is an industrial by-product, and PCM. In addition, it found out that PCM-mixed light-weight foamed concrete had time delay and temperature reduction effect within the range of PCM phase transition according to the rise of outdoor temperature. It was also observed that the insulation performance of PCM-mixed light-weight foamed concrete was more dependent upon thickness than PCM replacement ratio.

Characteristics of Low Density Fiberboards for Insulation Material with Different Adhesives (I) - Thermal Insulation Performance and Physical Properties - (다양한 접착제로 제조한 단열재용 저밀도섬유판의 특성(I) - 단열성능 및 물리적 성질 -)

  • Jang, Jae-Hyuk;Lee, Min;Kang, Eun-Chang;Lee, Sang-Min
    • Journal of the Korean Wood Science and Technology
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    • v.45 no.3
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    • pp.360-367
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    • 2017
  • This study was carried out to compare the characteristics of low density fiberboards (LDFs) manufactured with different adhesive types such as melamine urea formaldehyde (MUF), phenol formalehyde (PF), emulsified MDI (eMDI) and latexes resins. As results, hard LDFs were successfully manufactured by MUF, PF and eMDI resins. Thermal conductivities of all LDFs were significantly lower than commercial medium density fiberboard. Especially, all LDFs showed comparable thermal insulation performance with extruded polystyrene foam (XPS). LDF manufactured with eMDI resins showed the highest physical properties such as thickness/length swelling by water absorption and bending strength.