• 제목/요약/키워드: polypropylene fiber

검색결과 576건 처리시간 0.031초

폴리프로필렌 섬유 혼입량에 따른 초고성능 콘크리트의 내화 특성 (Fire Resistance of Ultra-High Performance Concrete According to the Amount of Polypropylene Fiber)

  • 최정일;조기현;유현상;김희준;이방연
    • 한국건설순환자원학회논문집
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    • 제8권2호
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    • pp.212-218
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    • 2020
  • 이 연구의 목적은 초고성능 콘크리트의 폴리프로필렌 섬유 혼입량에 따른 폭렬 특성을 조사하는 것이다. 이를 위하여 섬유 혼입량이 다른 각각의 배합을 가열온도 900℃까지 가열한 후, 폭렬 성상, 잔존 압축강도 및 초음파 전달속도를 평가하였다. 실험 결과, 소량의 폴리프로필렌 섬유를 혼입하여도 폭렬 저항성능이 향상되는 것으로 나타났다. 폴리프로필렌 섬유를 0.4%이상 혼입하면 가열온도 900℃에서도 폭렬이 발생하지 않은 것으로 나타났다. 가열온도 900℃일 때, 잔존 압축강도는 상온 압축강도보다 48% 감소하고, 초음파 전달속도는 상온 전달속도보다 44% 감소하는 것으로 나타났다.

Coloration of Pure Polypropylene Fiber with Super Hydrophobic Dyes; Application of Anthraquinone Derivatives with linear Alkyl Substituents

  • Kim, Tae-Kyeong;Yoon, Seok-Han;Hong, Jin-Pyo;Kim, Hong-Je;Bae, Jin-Seok
    • 한국염색가공학회지
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    • 제18권5호
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    • pp.30-34
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    • 2006
  • Polypropylene fiber was dyed with 4 super hydrophobic dyes having different alkyl derivatives on the same chromophore. Double-tailed cationic surfactant, didodecyldimethylammonium bromide(DDAB), was used to make dye-dispersant complex to improve the dispersion of dyes. As the alkyl groups are longer and the hydrophobicity is increased, the dyeability onto polypropylene fiber was improved and deep coloration was obtained. As for the fastness properties, wash fastness was relatively good, while light fastness was bit low.

Effects of Nucleating Agents on Preparation of Polypropylene Hollow Fiber Membranes by Melt Spinning Process

  • Kim, Bong-Tae;Kigook Song;Kim, Sung-Soo
    • Macromolecular Research
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    • 제10권2호
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    • pp.127-134
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    • 2002
  • Microporous polypropylene hollow fiber membrane was fabricated from isotactic polypropylene-soybean oil system by melt spinning process. Addition of nucleating agent accelerated the crystallization rate and elevated the crystallization temperature. Nucleating agent increased the number of nuclei and spherulites, which offered more inter-spherulitic amorphous sites for stretching. Benzoic acid, adipic acid, and dibenzylidene sorbitol were selected as nucleating agents, and their characteristics and effects were investigated by thermal and optical analyses. Spherulite growth and micropore formation characteristics were correlated with the kind of nucleating agent. Benzoic acid and adipic acid showed the remarkable nucleating effect, while dibenzylidene sorbitol was less effective than those. Nucleating agents also helped the sample have uniform microporous structure. Increase of nucleating agent composition enhanced the nucleation effect to some extent. Nucleating agents played very important roles in enhancing the membrane porosity and water flux.

시멘트 복합체의 내화성능 향상을 위한 폴리프로필렌 섬유의 형상과 혼입량 결정 (Geometry and Volume Fraction of Polypropylene Fiber in Cement Based Composites for Fire Resistnace)

  • 원종필;박경훈;김황희;김정훈;이수진;이시원
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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    • pp.397-400
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    • 2006
  • The addition of polypropylene fibers is effective to avoid spalling of shotcrete and concrete adopted tunnel and underground structure under the fire. In this study, a cement based mortar for fire resistance of polypropylene fiber was developed and evaluated by experimentally. The geometry and amount of polypropylene fibers which are diameter, length and fiber dosage were significant factors in aspect of the response values of fire resistance.

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흡습발열 Acrylate/Dyeable Polypropylene 섬유 방적사 편물의 염색 특성 (Dyeing Characteristics of Heat-generating Acrylate/Dyeable Polypropylene Blended Knit)

  • 이의재;박채은;김근형;이창석;최재홍
    • 한국염색가공학회지
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    • 제29권1호
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    • pp.1-10
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    • 2017
  • Blended knit with two or more fiber has various dyeing characteristics depending on dyeing method because of different material properties of them. In this paper, newly developed blended knit was used. It was composed by Acrylate fiber and Dyeable polypropylene(DPP) fiber. As result of build-up dyeing test, acid dyes and disperse dyes respectively had good dyeabilities on 1% o.w.f. with Acrylate fiber and DPP fiber. Compatibility of trichromatic of disperse dyes was generally good for most dyes investigated and their critical absorption range were between $120^{\circ}C$ and $130^{\circ}C$. As depending on dyeing methods, there were many differences in dyeability. It was confirmed that 1-bath-1-step dyeing was most suitable when considering dye exhaustion yield and levelling property. Wash, rubbing and light fastness of knits were generally good in most dyes.

엔진커버용 폴리프로필렌/유리섬유/대나무섬유 복합체의 물리적 특성에 대한 대나무섬유의 용제 처리의 영향 (Effects of Solvent Treatment of Bamboo Fiber on Physical Properties of Polypropylene/Glass Fiber/Bamboo Fiber Composite)

  • 이수경;임성욱;신형식;우승건;박은영
    • 한국염색가공학회지
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    • 제31권1호
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    • pp.42-47
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    • 2019
  • In this study, the effects of surface treatment of bamboo fiber on the physical properties of polypropylene(PP)/glass fiber(GF)/Bamboo fiber(BF) composite for engine cover were investigated. PP, GF and BF were fixed at 40%, 40% and 20% and the surface of bamboo fibers were treated to 0.5, 1.0 and 2.0% as an acid and alkali solution. PP/GF/BR composites using surface treated bamboo fibers were prepared and their tensile strength, bursting strength and impact strength were measured by universal testing machine(UTM). The composites with alkali treated bamboo fiber showed better mechanical properties than the acid treated composites. It was checked that the optimum alkali content was at 1.0% from the results of mechanical properties. The effect of surface treatment on the mechanical properties was confirmed by SEM images of fractured surface.

고온에서 폴리프로필렌섬유와 비정질강섬유를 보강한 150MPa급 초고강도 콘크리트의 수증기 압력특성 (The water vapor pressure property of 150MPa level ultra high strength concrete reinforced with polypropylene fiber and amorphous steel fiber at high temperature)

  • 서동균;김규용;이상규;황의철;유하민;남정수
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.132-133
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    • 2020
  • The aim of this study is to evaluate the combination effect of amorphous steel fiber and polypropylene fiber on spalling of the 150MPa level ultra high strength concrete. Considering spalling has a great relationship with water vapor pressure, this paper is focusing on water vapor pressure. The test specimens were heated accordance with ISO-834 Standard Curve using electric heating furnace, the depth of 10mm water vapor pressure formation was tend to get faster and spalling damage become severe when the mixing proportion of amorphous steel fiber increase. When using ultra high strength concrete reinforced with amorphous steel fiber, further research about proper mixing proportion of polypropylene fiber.

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폐양모/폴리프로필렌 복합재료의 기계적 특성 및 충격강도에 미치는 폐양모섬유의 알칼리처리 또는 실란처리 영향 (Influence of Alkali or Silane Treatment of Waste Wool Fiber on the Mechanical Properties and Impact Strength of Waste Wool/Polypropylene Composites)

  • 김기현;조동환
    • 접착 및 계면
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    • 제18권3호
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    • pp.118-126
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    • 2017
  • 천연섬유강화 복합재료에서 여러 가지 섬유표면 개질을 통해서 천연섬유와 고분자매트릭스 사이에 계면접착과 복합재료 특성을 향상시키고자 하는 많은 연구 노력이 있었다. 본 연구에서는 폐양모섬유 강화 폴리프로필렌 매트릭스 복합재료를 압축성형공정 방법으로 제조하였고, 그들의 기계적 특성 및 충격 특성을 분석하였다. 그 결과, 폐양모/폴리프로필렌 복합재료의 인장 및 굴곡 특성 그리고 충격강도는 수산화나트륨(NaOH)을 이용한 알칼리처리와 3-glycidylpropylsilane(GPS)을 이용한 실란처리와 같은 처리매체에 크게 의존하였다. 실란처리를 한 폐양모섬유를 포함한 복합재료는 알칼리처리를 한 폐양모섬유를 포함한 것보다 더 우수한 기계적 특성과 충격저항성을 나타내었다. 복합재료 파단면은 특성 증가가 폐양모섬유와 폴리프로필렌 매트릭스 사이에 계면결합의 향상에 의한 것임을 정성적으로 뒷받침해주었다.

폴리프로필렌 섬유보강 콘크리트의 파괴특성 연구 (Fracture Characteristics of Polypropylene Fiber Reinforced Concrete)

  • Shin-Won Paik
    • 한국안전학회지
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    • 제12권4호
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    • pp.230-240
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    • 1997
  • 본 연구에서는 폴리프로필렌 섬유보강 콘크리트의 파괴특성을 알아보기 위해 Monofilament 섬유와 Fibrillated 섬유의 두 종류 폴리프로필렌 섬유를 선택하여 10$\times$10$\times$50 cm 보 시편을 만들었는데, 이때 사용된 두 종류의 섬유 길이는 19 mm이고, 섬유 혼입량은 0%, 1%, 2%, 3%로 하였으며, 초기균열 깊이의 영향을 알아보기 위해 초기 균열길이를 각 섬유 혼입량에 따라 1.5cm, 3.0cm, 4.5cm로 하여 실험을 수행하였다. 또한, 본 연구에서는 폴리프로필렌 섬유보강 콘크리트의 파괴특성을 규명하기 위해 보 시편에 대한 4 점 하중 휨시험을 통해 하중-하중점 변위 곡선을 각 시편에 대해 측정하였고, 이때 COD 게이지를 이용하여 하중-CMOD 곡선도 측정할 수 있었다. 이러한 실험결과를 통해, 섬유혼입량과 초기 균열 깊이에 따른 압축강도, 휨강도 및 휨인성, 응력확대계수, 파괴에너지 등이 규명되었다. 이러한 결과에 대한 분석으로부터 Fibrillated 폴리프로필렌 섬유가 Monofilament 섬유보다 연성 효과가 큰 것을 알 수 있었으며, 특히 하중-CMOD 곡선으로부터 계산되는 파괴에너지인 Jc가 믿을만한 파괴특성 인자임을 알 수 있었다.

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공정변수(工程變數)와 MAPP 결합제(結合劑)가 난기류(亂氣流) 혼합방식(混合方式)에 의하여 제조(製造)된 목섬유(木纖維)-폴리프로필렌섬유(纖維) 복합재(複合材)의 성질(性質)에 미치는 영향(影響) (Effects of Process Variables and MAPP Coupling Agent on Properties of Wood Fiber-Polypropylene Fiber Composite by Turbulent Air Mixing)

  • 윤형운;박종영
    • Journal of the Korean Wood Science and Technology
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    • 제26권1호
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    • pp.76-86
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    • 1998
  • Effects of processing variables and MAPP (maleic anhydride polypropylene) coupling agent on the properties of composite were discussed for turbulent-air-mixed woodfiber-polypropylenefiber composites. In this research, density, composition ratio, and mat moisture content were established as processing variables, and emulsified MAPP prepared by direct pressure method was incorporated as the coupling agent. And the turbulent air mixer, which was improved in function through alteration of our previous fiber mixer, was used to mix wood fibers and polypropylene fibers. At the addition level of 1% MAPP, based on oven-dried wood fiber weight, woodfiber-polypropylenefiber composites generally showed enhanced the physical and mechanical properties. And composites with low to medium densities of 0.6 to 0.8g/$cm^3$ greatly increased in these property values than with high densities of 1.0g/$cm^3$ or more by adding 1 % MAPP. Thus, MAPP addition was thought to be an effective way of enhancing properties for nonwoven web composites. At the mat moisture contents of 5 to 20%, however, the physical and mechanical properties were not enhanced by adding 1% MAPP. In the composites containing 15% polypropylene fibers, the lowest thickness swelling and water absorption values were observed at the 1% MAPP level. The addition of more than 1% MAPP had the adverse effect on the physical and mechanical properties of composites.

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