• Title/Summary/Keyword: 충진

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Effect of GAC Packing Mass in Hybrid Water Treatment Process of PVdF Nanofibers Spiral Wound Microfiltration and Granular Activated Carbon (PVdF 나노섬유 나권형 정밀여과와 입상 활성탄의 혼성 수처리에서 활성탄 충진량의 영향)

  • Kyung, Kyu Myung;Park, Jin Yong
    • Membrane Journal
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    • v.27 no.1
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    • pp.68-76
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    • 2017

  • Flat membrane with $0.4{\mu}m$ pore size was prepared with PVdF (polyvinylidene fluoride) nanofiber, which has the advantages such as excellent strength, chemical resistance, non-toxicity, and incombustibility. The spiral wound module was manufactured with the flat membrane and a woven paper. Hybrid water treatment process was composed of the PVdF nanofibers spiral wound microfiltration and granular activated carbon (GAC) adsorption column. Effect of GAC packing mass was investigated by comparing the case of recycling or discharging the treated water using the synthetic solution of kaolin and humic acid. After each filtration experiment, water back-washing was performed, and recovery rate and filtration resistances were calculated. Also, effect of GAC adsorption was compared by measuring turbidity and $UV_{254}$ absorbance. As a result, there was no effect of GAC packing mass on turbidity treatment rate; however, the treatment rate of $UV_{254}$ absorbance was 0.7~3.6% for recycling the treated water, and increased to 3.2-5.7% for discharging the treated water. In the case of recycling the treated water, reversible filtration resistance ($R_r$) and irreversible filtration resistance ($R_{ir}$) trended to decrease as increasing GAC packing mass; however, total fitration resistance ($R_t$) was almost constant, and recovery rate of water back-washing trended to increase a little.

  • https://doi.org/10.14579/MEMBRANE_JOURNAL.2017.27.1.68 인용 PDF KSCI

Recycle of Unburned Carbon and Microceramics as Alternatives to Rubber Weight-Adding Materials and Polypropylene Filling Agents (고무증량재 및 플라스틱 충진재의 대체재로 UC와 CM의 재활용)

  • Han, Gwang Su;Kim, Dul-Sun;Lee, Dong-Keun
    • Clean Technology
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    • v.27 no.1
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    • pp.24-32
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    • 2021

  • Unburned carbon (UC) was successfully separated from fly ash by up to 85.8% in weight via froth flotation using soybean oil as a collector. An 18 wt% yield of microceramics (CM) could be achieved by employing a hydro cyclone separator located immediately after the flotation equipment. UC and CM were tested as alternatives to weight-adding material and polymer (especially polypropylene in this study) filler, respectively. Large particles of UC were broken down into smaller ones via ball milling to have an average particle diameter of 10.2 ㎛. When crushed UC was used as an alternative to clay as a rubber weight-adding material, a somewhat lower tensile strength and elongation rate than the allowed values were unfortunately obtained. In order to satisfy the standard limits, further treatment of UC is required to enhance surface energy for more intimate bonding with rubber. CM was observed in spherical forms with an average diameter of 5 ㎛. The surface of the CM particles was modified with phenol, polyol, stearic acid, and oleic acid so that the surface modified CM could be used as a polypropylene-filling agent. The flowability was good, but due to the lack of coupling forces with polypropylene, successful impact strength and flexural strength could not be obtained. However, when mixing the surface-modified CM with 1% silane by weight, a drastic increase in both the impact strength and flexural strength were obtained.

  • https://doi.org/10.7464/ksct.2021.27.1.24 인용 PDF KSCI

복합 Filler 충진 전기전도성 폴리머 소재

  • 강영구;송종혁
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2002.11a
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    • pp.29-33
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    • 2002

  • 산업의 고도화에 따라 반도체를 비롯한 전자산업의 발전과 더불어 전자파의 인체 유해성에 대한 EMI 규제가 더욱 강화되고 있으며 반도체 소자나 정밀기기의 ESD 기술이 요구되고 있다. 따라서 전기전도성 고분자는 유해전자파의 차폐나 정전기 방지를 위한 특수용도의 소재로 각광받고 있으며 그 수요가 급증하고 있다.(중략)

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