• Title/Summary/Keyword: 경화수지처리

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Setting Shrinkage, Thermal Expansion Coefficient and Compressive Strength of Recycled PET Polymer Concrete with Montmorillonite (몬모릴로라이트를 이용한 재활용 PET폴리머 콘크리트의 경화수축, 온도팽창계수, 압축강도)

  • Jo Byong-Wan;Tae Ghi-Ho;Lee Du-Wha
    • Journal of the Korea Concrete Institute
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    • v.16 no.2 s.80
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    • pp.205-212
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    • 2004
  • Recently, as concerns over environmental issues are raised more and more trend to use recycled waste for producing construction materials is also raised. Especially, a case of waste resin is considerably destroying the environment due to disposal way that most waste resin produced is disposed of landfill. This study is performed by polymer concrete with recycled PET resin in terms of obtaining safely clean construction resources and protection of environment. High setting shrinkage and sensitivity to heat are main disadvantages of Polymer Concrete (PC) despites of a lot merits. The aim of this study is to investigate basic properties such as setting shrinkage, length change and sensitivity to heat about PET recycled polymer concrete. The other is to check the possibility of use of Montmorillonite as one of a lot of additive without special coupling agent. As results of experiments, various properties of polymer concrete with recycled PET resin are similar with conventional PC except that polymerization time is longer. Montmorillonite was efficiently used to reduce setting shrinkage, length change and coenicient of thermal expansion related to heat with enhanced strength

Study on the Development of Putty According to Epoxy Resin Hardener (Epoxy 수지 경화제에 따른 Putty 개발에 관한 연구)

  • Oh, Seung-Jun;Cheong, Da-Som;Park, Gi-Jung;Wi, Koang-Chul
    • Journal of Conservation Science
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    • v.31 no.2
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    • pp.105-114
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    • 2015
  • In this study, an advanced epoxy putty which was as a multi-purpose restoration material being used to restore missing parts in the artifact preservation treatment process was developed. For the purpose of addressing the issues including the workability issue resulting from high strength, the drooping issue resulting from long hardening time during work process and the issue of contaminating the surface of artifact resulting from stained material on tools or gloves, a property comparison was conducted with existing materials to examine the properties of restoration materials in the form of epoxy putty currently being frequently used. For the purpose of addressing the issues of existing materials and allowing the developed epoxy putty to have similar properties, two types of hardeners with different properties were selected to conduct property experiments. As for the hardeners, mercaptan type hardener and aliphatic amine type hardeners in the total of two types were selected for the development. The result showed that the two types were both in the form of paste and their hardening time of 5-10 minutes were about 3-10 times shorter than that of existing materials, thereby improving the work convenience. In terms of abrasion rate to increase workability, it was improved by about 3 times to allow effective and convenient use. As for the issue of contaminating the artifact surface during the process, white micro-balloon was added as filler to address the issue to reduce the oil ingredient to develop multi-purpose restoration material with low shrinkage & high workability in coloring, light weight and cutting force.

Conservation of Straw Sandals Excavated at Goongnamji in Buyeo (부여 궁남지 출토 짚신의 보존처리)

  • Na, Mi-Sun;Kim, Ik-Joo;Kim, Kyeong-Hee
    • Journal of Conservation Science
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    • v.17 s.17
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    • pp.65-72
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    • 2005
  • To preserve straw sandals excavated at Goongnamji site, this study examined the weight change rate by applying the methods of Primal MC-76 and vacuum freeze-drying used mostly as a earth-layer hardening material among PEG and acrylic resin, which are applied widely for preservation of waterlogged archaeological wood, as a means to preserve plant-based cultural properties along with the examination of the subject material. An experiment was also performed on moisture absorption after treatment. The materials of sandals were identified as Typha spp. The weight change experiment revealed that the vacuum freeze-drying after being treated with PEG 2-Step showed the most stabilized changes in weight, while it offered the smallest change in color as well.

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Bonding Quality of Cylindrical LVL and Surface Durability by Its Painting (원통형 단판적층재의 접착성 및 도장처리에 따른 표면내구성)

  • Suh, Jin-Suk;Kim, Jong-In;Hwang, Sung-Wook;Park, Sang-Bum
    • Journal of the Korean Wood Science and Technology
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    • v.40 no.6
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    • pp.418-423
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    • 2012
  • In order to develop the end use of cylindrical laminated veneer lumber (LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows; The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde (5) by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of an cross section of LVL, the higher surface hardness appeared at larch core than radiata pine LVL. Also, in case of an tangential section of LVL, the higher surface hardness appeared at glue line than veneer side.

Thermal Properties of Cured Epoxy Resin Filled with Rubber Complex-Treated Silica (고무상 복합물로 표면처리 한 실리카를 충전한 에폭시 수지 경화물의 열적 특성)

  • Choi, Sang-Goo;Suh, Won-Dong
    • Elastomers and Composites
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    • v.32 no.1
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    • pp.11-19
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    • 1997
  • [ ${\gamm}-Glycidoxy$ ] propyl trimethoxy silane, CTBN rubber(carboxyl terminated butadiene acrylonitrile rubber) and GMA(glycidyl methacrylate) were reacted on the surface of silica one by one in existence of TEA(triethylamine) or BPO(benzoyl peroxide). The amount of reactant was $2.5{\sim}5.8%$ of treated silica weight. The treated silica was mixed with epoxy resin and MTHPA(methyl tetrahydro phthalic anhydride) in the range of $0{\sim}60%$(wt.%) of total component. The thermal properties were tested for cured products. By using silica treated with silane/rubber or silane/rubber/vinyl, comparing with 3% of rubber mixed directly, it had 13% higher $T_g$ and 10% lower thermal expansion coefficient at $35{\sim}55%$ of silica contents.

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Influence of Sizing Agent on Interfacial Adhesion and Mechanical Properties of Glass Fiber-reinforced Plastics

  • 김택진;박수진;이재락;김영근
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 1999.11a
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    • pp.44-48
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    • 1999
  • 섬유 강화 고분자 복합재료에서 강화재인 섬유와 매트릭스의 계면은 복합재료의 물성에 지대한 영향을 미친다. 섬유와 매트릭스의 물성 차이 즉, 탄성율, 열팽창 계수, 경화시의 수축, 결정화도 등의 차이뿐만 아니라 하중이 가해질 때 응력 집중 (stress concentration) 현상이 계면에서 일어난다[1]. 유리섬유를 강화재로 사용한 복합재료에서 유리섬유는 표면이 hydroxyl기로 덮여 있기 때문에 친수성이 매우 크고 또한 마찰이나 정전기에 의해 손상을 받기 쉬운 단점이 있다. 따라서 매트릭스 수지와의 계면 접착력을 향상시키고 제조 공정 중에 섬유를 마찰이나 정전기로부터 보호하기 위한 처리가 필요하며 이들 "sizing" 이라고 한다[2,3].고 한다[2,3].

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A study on dielectric and mechanical properties and mica aspect ratio interactions of mica/silicone composites (마이카/실리콘 복합재료의 전기, 기계적 특성과 마이카 아스펙 비의 상관관계에 관한 연구)

  • 조정수;김순태;곽영순;박정후
    • Electrical & Electronic Materials
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    • v.5 no.4
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    • pp.374-384
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    • 1992
  • 마이카/실리콘 복합재료의 필라로 사용되는 마이카 플레이크의 아스펙비가 복합재료의 전기적, 기계적 특성에 미치는 영향을 연구하기 위하여 아스펙비가 각각 250, 500, 800인 세 종류의 마이카 플레이크로 마이카 페이프를 만들어 계면 결합제를 처리한 후 실리콘 수지에 함침, 경화시켜 복합재료를 제작하였다. 아스펙비 500인 시료에서 가장 양호한 전기, 기계적 특성이 얻어졌으며 필라와 매트릭스 사이의 계면 결합제 최적 적용량은 마이카 페이프에 대한 무게비 0.3%이며 마이카 함유량은 전체시료의 80%일때 유전 특성이 가장 우수했으며 PET를 마이카/실리콘 복합재료 양면에 코팅하면 더욱 전기, 기계적 특성이 우수한 복합재료가 실현된다.

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Behavior of Physical Properties of Hybrid Coating layers Depending on the Content of Silica Sol (실리카 졸 함량에 따른 유무기 하이브리드 코팅층의 물성 변화 거동)

  • Choe, Seon-U;Jeong, Seong-Hyeon;Kim, Eun-Gyeong;Kim, Sang-Seop
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2011.05a
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    • pp.71-72
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    • 2011
  • 최근 스마트 휴대폰으로 대표되는 이동통신기기 산업의 빠른 성장으로 인하여 이들 기기를 보호하기 위한 표면 처리기술이 함께 발전하고 있다. 그중 대표적인 것이 나노기술을 융합한 보호막 도장 기술이다. 본 연구에서는 마그네슘 기판과 플라스틱 케이스 소재 위에 유무기 하이브리드 도장막을 형성시키고, 도장막의 실리카 조성에 따른 물리화학적 변화 거동을 관찰하였다. 특히, 실리카 나노입자가 첨가된 실리카 졸 용액과 UV 경화수지를 다른 비율로 혼합한 나노형 하이브리드 코팅용액을 사용하였으며, 딥 코팅과 스프레이 코팅법을 개별적으로 이용하여 형성한 유무기 하이브리드 코팅층의 경도와 내지문 특성을 중점적으로 조사하였다. 이러한 연구를 통하여 유무기 하이브리드 코팅층 형성에서 실리카 졸의 역할과 최적 물성확보를 위한 근거를 마련하였다.

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An Assessment Study on Stability of Various Coating Treatment of Metallic Artifacts Using V-Flon (불소 수지(V-Flon)를 이용한 금속유물의 코팅 형성에 대한 안전성 평가 연구)

  • Lee, Jung-Min;Wi, Koang-Chul
    • Journal of Conservation Science
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    • v.26 no.2
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    • pp.149-156
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    • 2010
  • One of resins, V-Flon is useful as a coating material because YK-D80, which is a solvent for V-Flon, is not highly volatile. However, it can not completely harden and can flow out when metal artifacts are joined and restored in the process of the treatment. Therefore, after the impregnation process in order to accelerate the hardening speed of a coating material, usually a dry oven was adopted. This study focused on finding the problems on the dry oven which is employed to increase the speed and investigating the most effective solvent and its composition by checking any change occurred depending on the concentration of solvents. Six different types of solvents were selected and samples were prepared in a manner that they were impregnated with solvents in three concentrations respectively (10%, 20%, 30%). To determine the condition of the samples, the stability evaluation was performed by measuring the change of color and the gloss, the thickness of coated layers, the corrosion after coating, the water resistance by contact angles. Through the comparative experiments between the natural drying and the artificial drying using a dry oven, it was found that when the dry oven is used, some problems are identified on the point of forming a uniform and stable layer because of the unstable data collected from the forced artificial dry. The experiments performed using 3 different concentration rates (10%, 20%, 30%) presented that in the case of 10% V-Flon in Xylene (using as a solvent), its layer was thin as well as it showed the high water-barrier property, which allows it to form the stably coated layer with the lower gloss and color change.

Analysis of Insulating Reliability in Epoxy Composites (Epoxy 복합체의 절연 신뢰도 해석)

  • 임중관;천민우;박용필
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.10a
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    • pp.724-728
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    • 2001
  • In this study, the dielectric breakdown of epoxy composites used for transformers was experimented and then its data were simulated by Weibull distribution probability. The dielectric breakdown characteristics origin in epoxy composites were examined and various effects of dielectric breakdown on epoxy composites were also discussed. As a result, first of all, speaking of dielectric breakdown properties, the more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical. And the breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised, the electric field is concentrated, and the acceleration of electron and the growth of electron avalanche are early accomplished. In the case of filled specimens with treating silane, the breakdown strength become much higher since this suggests that silane coupling agent improves interfacial combination and relaxs electric field concentration. Finally, from the analysis of weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1%, the applied field value needed to be under 21.5㎹/cm.

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