• Title/Summary/Keyword: 폴리머라텍스

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Durability of Polymer-Modified Mortars Using Acrylic Latexes with Methyl Methacrylate (MMA계 아크릴 라텍스를 혼입한 폴리머시멘트 모르타르의 내구성)

  • Hyung Won-Gil;Kim Wan-Ki;Soh Yang-Seob
    • Journal of the Korea Concrete Institute
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    • v.17 no.3 s.87
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    • pp.411-418
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    • 2005
  • Polymer-modified mortar and concrete are prepared by mixing either a polymer or monomer in a dispersed, or liquid form with fresh cement mortar and concrete mixtures, and subsequently curing, and if necessary, the monomer contained in the mortar or concrete is polymerized in situ. Although polymers and monomers in any form such as latexes, water-soluble polymers, liquid resins, and monomers are used in cement composites such as mortar and concrete, it is very important that both cement hydration and polymer phase formation proceed well the yield a monolithic matrix phase with a network structure in which the hydrated cement phase and polymer phase interpenetrate. In the polymer-modified mortar and concrete structures, aggregates are bound by such a co-matrix phase, resulting in the superior properties of polymer-modified mortar and concrete compared to conventional mortar and concrete. The purpose of this study is to obtain the necessary basic data to develope appropriate latexes as cement modifiers, and to clarify the effects of the monomer ratios and amount of emulsifier on the properties of the polymer-modified mortars using methyl methacrylate-butyl acrylate(MMA/BA) and methyl methacrylate-ethyl acrylate(MMA/EA) latexes. The results of this study are as follows, the water absorption, chloride ion penetration depth and carbonation depth of MMA/BA-modified mortar are lowest. However, they are greatly affected by the polymer-cement ratio rather than the bound MMA content and type of polymer.

환경친화적인 Core/shell 부직포 바인더의 제조에 관한 연구

  • 권재범;이내우;설수덕;임재길;임종빈
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2003.05a
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    • pp.468-473
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    • 2003
  • 유화중합은 물을 용매로 사용하기 때문에 화재와 폭발의 위험성이 없고 환경문제가 없으며 원료 원가 면에서 저렴한 특징이 있기 때문에 수요가 매년 증가하고 있는 실정이다. 이 같은 장점을 지닌 유화중합은 물을 분산매로 폴리머를 제조하는 유용한 기술이지만 유화제, 이온성의 개시제 등과 같이 폴리머 본래의 성질을 저하시키며 물에 잘 용해되는 성분을 수반한다. 따라서 이러한 기존 유화중합법의 단점을 보완한 새로운 에멀젼 라텍스 제조기술로서, 유화제 대신에 폴리비닐알콜과 같은 보호폴로이드 또는 유기 과산화물을 사용하는 무유화제 제조기법에 대한 연구가 이루어지고, 이와 같이 제조된 에멀젼 라텍스는 기존 공정에 의해 제조된 제품에 비해 내수성과 건조된 필름의 인장 강도 및 여러 매트릭스에 대한 부착력이 향상된다. 그러나 이들 방법으로 제조된 폴리머도 복합 물성이 요구되는 분야에는 한계가 있어 복합 라텍스 제조에 대한 새로운 연구가 최근에 많이 되고 있다.(중략)

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fundamental Properties of Water-Permeable Polymer-Modified Concrete (투수성 폴리머 시멘트 콘크리트의 기공적 성질)

  • 이윤수;주명기
    • Journal of the Korea Concrete Institute
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    • v.14 no.3
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    • pp.402-408
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    • 2002
  • The permeable polymer-modified concrete has a lot of internal voids, which has more excellent performance in permeability and durability than asphalt and cement concrete. Therefore, the purpose of this study is to ascertain the strength properties of water-permeable polymer concretes with SBR latex and redispersible polymer powder. The water-permeable polymer concretes using SBR latex and redispersible polymer powder with water-binder ratio of 29 %, polymer-cement ratios of 0, 5, 10, 15 and 20 % are prepared, and tested for compressive strength, splitting tensile strength, flexural strength, water permeablility. From the test results, improvements in the strength properties of the water-permeable polymer concretes due to the addition of the SBR latex and redispersible polymer powder are discussed.

Strength Properties of SBR-Modified Concretes Using Ground Granulated Blast-Furnace Slag (고로슬래그 미분말을 이용한 SBR혼입 폴리머 시멘트 콘크리트의 강도특성)

  • ;;Yoshihiko Ohama
    • Journal of the Korea Concrete Institute
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    • v.14 no.3
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    • pp.315-320
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    • 2002
  • The effects of slag content and polymer-binder ratio on the strength properties of the polymer-modified concretes using ground granulated blast-furnace slag and a styrene-butadiene rubber (SBR) latex are examined. As a result, the compressive, tensile and flexural strengths of the SBR-modified concretes using slag increase with increasing polymer-binder ratio and slag content, and maximized at a slag content of 40 %. In particular, the SBR-modified concretes with a slag content of 40 % provide approximately two times higher tensile and flexural strengths than unmodified concretes. Such high strength development is attributed to the high tensile strength of SBR polymer and the improved bond between cement hydrates and aggregates because of the addition of SBR latex.

Durability Performances of Concrete Produced with Recycled Bio-Polymer Based on Sargassum Honeri (괭생이모자반 기반의 자원순환형 바이오 폴리머를 혼입한 콘크리트의 내구성능)

  • Lee, Byung-Jae;Lee, Sun-Mok;Hyun, Jung-Hwan;Kim, Yun-Yong
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.7 no.4
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    • pp.445-451
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    • 2019
  • In this study, we evaluated the durability of concrete produced with recycled polymer that could replace synthetic polymer, which is the main raw material of bridge deck concrete pavement. As a result of the slump and air content test, the requirements of the Korea Highway Corporation Standard were satisfied with all mixing conditions. The slump was lowered when incorporating the recycled bio-polymer, compared to other mix proportions concrete. In contrast, the compressive strength was increased by 6.3~24.4% when the recycled bio-polymer was mixed, compared to the concrete produced with synthetic polymer. It should be noted that the compressive strength was lowered when synthetic polymer was added to concrete mixture. Durability test results showed the best durability when incorporating synthetic polymer. The durability of concrete also increased as the amount of recycled bio-polymer increased, however, the impact was slightly smaller than that of synthetic polymer.

Preparation and Application Characteristics of Carboxylated Styrene Butadiene Latex for Polymer Cement Mortar (폴리머 시멘트 몰타르 포장재용 Carboxylated Styrene Butadiene 라텍스의 제조와 적용 특성)

  • Lee, Bong-Kyu;Ju, Chang-Sik
    • Korean Chemical Engineering Research
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    • v.50 no.5
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    • pp.789-794
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    • 2012
  • For the purpose of development of the latex suitable for polymer cement mortar, experiments on the preparation of carboxylated styrene butadiene latex by the method of the two-step emulsion polymerization were performed. Methyl methacrylate, methacrylic acid and acrylic acid were selected as carboxylic co-monomer, styrene and butadiene as monomer, sodium dodecylbenzene sulfonate and sodium salt of lauryl sulfonate as anionic emulsifiers, and nonylphenoxy poly (ethyleneoxy) ethanol (n=10, 20, 40) as latex stabilizer. Potassium persulfate and sodium bisulfite were also used as redox initiator, and sodium monohydrogen phosphate and potassium carbonate as electrolytes. The effects of categories and concentration of carboxylic co-monomer, molecular weight control agent, crosslinking agent, and styrene/butadiene monomer ratio on the characteristics of latex were investigated. Polymerization recipes for preparation of polymer cement mortar could be proposed. The prepared latexes were tested for the physical properties such as compressive and flexural strength when latexes were mixed with cement mortar. The results showed that the latex could be adapted to polymer cement mortar. Also, it was recognized that the compressive and flexural strength were exhibited 25.4% and 45.3% respectively higher improvement than the quality standards at 28 days curing time.

Study on manufacturing mechanism of functional carbon membrane (기능성 카본막의 제조 Mechanism에 관한 연구)

  • Bae, Sang-Dae
    • The Journal of the Convergence on Culture Technology
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    • v.4 no.2
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    • pp.211-216
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    • 2018
  • Separation technology combining adsorption and membrane is expected to be applied in many fields such as water treatment. In this fusion technique, a functional carbon membrane having a carbon whisker grown on the surface of the membrane was developed to inhibit membrane fouling, which is a problem in the membrane separation process. In this study, to elucidate the mechanism of manufacturing the functional carbon membrane, the membrane was pretreated with the polymer latex of each mixing ratio and the membrane was formed by the CVD (Chemical Vapor Deposition) method. The membrane was analyzed by scanning electron microscope (SEM), CHN analyzer (Elemental Analyzer), and X-ray diffraction (XRD). As a result, the diameter and density of carbon whiskers were higher in case of polyvinyl di-chloride (PVdC): polyvinyl chloride (PVC) = 4.5: 55. It seems possible to control the diameter and density of the carbon whiskers according to the hydrogen content of the polymer latex.

Properties of Polymer-Modified Mortars Using Methylmethacrylate-Butyl Acrylate Latexes with Various Monomer Ratios (모노머비를 변화한 MMA/BA 합성 라텍스 혼입 폴리머 시멘트 모르타르의 성질)

  • Hyung, Won-Gil;Kim, Wan-Ki;Choi, Nak-Woon;Soh, Yang-Seob
    • Journal of the Korea Concrete Institute
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    • v.15 no.2
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    • pp.273-279
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    • 2003
  • The purpose of this study is to clarify the effect of the monomer ratio on properties of the polymer-modified mortars using methylmethacrylate-butyl acrylate(MMA/BA) latexes, and to obtain basic data necessary to develop appropriate latexes for cement modifiers. From the test results, we knew that the pore volume of polymer-modified mortars using MMA/BA latexes at bound MMA contents of 60 and 70 percent is 7.5∼75nm and the fine pore volume is increased with an increase in the polymer-cement ratio. The total pore volume of polymer-modified mortars using MMA/BA latexes is linearly reduced with an increase in the bound MMA content and increased in the polymer-cement ratio. In general, the superior compressive strength of polymer-modified mortars using MMA/BA latexes is obtained at a bound MMA content of 70 percent and a polymer-cement ratio of 15%. And, the water absorption and chloride ion penetration depth are greatly affected by the polymer-cement ratio rather than the bound MMA content. The important factors affecting the properties of polymer-modified mortars using MMA/BA latexes polymerized with various monomer ratios are the variations of the pore size distribution with changing bound MMA content and the polymer-cement ratio.

Effect of Addition of Ground Granulated Blast-furnace Slag on Strength Properties of Autoclaved Polymer-Modified Concrete (오토클레이브 양생 폴리머 시멘트 콘크리트의 강도성상에 미치는 고로슬래그 미분말 혼입의 영향)

  • 주명기
    • Journal of the Korea Concrete Institute
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    • v.14 no.4
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    • pp.608-614
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    • 2002
  • The effects of slag content and polymer-binder ratio on the strength properties of autoclaved SBR-modified concretes using ground granulated blast-furnace slag(slag) and a styrene-butadiene rubber (SBR) latex are examined. As a result, the compressive and tensile strengths of the autoclaved SBR-modified concretes using slag increase with increasing slag content, and reach a maximum at a slag content 40%, and increase with increasing polymer-binder ratio. In particular, the autoclaved SBR-modified concretes with a slag content of 40% provide about three times higher tensile strength than unmodified concretes. Such high strength development is attributed to the high tensile strength of SBR polymer and the improved bond between cement hydrates and aggregates because of the addition of SBR latex.

Properties of Latex Modified Concrete by Binder Content and Effect on Chloride Ion Diffusion (라텍스 개질 콘크리트(LMC)의 결합재량에 따른 배합 및 염화물 이온 확산 특성)

  • Park, Sung-Gi;Won, Jong-Pil;Park, Chan-Gi;Lee, Sang-Woo;Sung, Sang-Kyoung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.949-952
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    • 2008
  • The latex modified concrete(LMC) was adds latex in the plain concrete as the latex has increase the durability of concrete. But it is added in LMC manufacture, which is a high price compares with different material and there is a weak point where the construction expense is very high. So, this study are decided mix proportion from the scope where the security strong point of LMC is possible and reduced the material expense by control the latex contents. and these mix proportions are estimated the chloride ion diffusion. The results of study appear that it can reduced the latex content until the $5{\sim}10$% of cements, and these mixtures are very low chloride ion diffusion.

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