• Title/Summary/Keyword: 분말 수지

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Scavenging Effect of Injurious VOC from Flooring using Green Tea Leaves Powder (녹차잎분말을 이용한 마루판의 유해 TVOC 제거효과)

  • Kang, Seog Goo;Lee, Hwa Hyoung
    • Journal of the Korean Wood Science and Technology
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    • v.36 no.6
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    • pp.49-58
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    • 2008
  • This research was carried out to use green tea leaves powder for scavenging effects of volatile organic compounds on the UV varnishes and adhesives of fancy cherry veneer overlaid on the PF resin bonded Meranti plywood. The results are as follows: 1) Green tea leaves contained 9.85% of polyphenol compounds. 2) FT-IR results showed green tea leaves had effects to react with benzaldehyde and ethyl hexyl alcohol to form a chemical bond. 3) 2.5% of green tea leaves powder content was proper for scavenging effect on the UV varnishes and adhesives of fancy veneer overlaid on the PF resin bonded plywood 4) 20 liters small chamber test indicated excellent emission speed results such as $0.089mg/m^2hr$ of TVOC and $0.001mg/m^2hr$ of HCHO (on 7th day), as compared with standard (less than $0.1mg/m^2hr$ of TVOC and $0.015mg/m^2hr$ of HCHO emission are the excellent grade).

Magnetic Properties of Nylon 6 based Nd-Fe-Co-Zr-B Pellets for Injection Molding (사출성형용 Nylon 6계 Nd-Fe-Co-Zr-B 펠렛의 자기특성)

  • 최승덕;이우영;양충진
    • Journal of the Korean Magnetics Society
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    • v.3 no.1
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    • pp.34-40
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    • 1993
  • Nylon 6 based magnetic pellets for injection molding were produced using plasma arc melt-spun $Nd_{10.5}Fe_{79}Co_{2}Zr_{1.5}B_{7}$ powders. Two sorts of bonded magnets made of two different sizes of particles ($38~75\;\mu\textrm{m}$ and $75~150\;\mu\textrm{m}$) were prepared to determine critical volume fraction of magnet powders, and the magnetic prop erties of the magnets were discussed as a function of density. For the nylon fi based Nd-Fe-Co-Zr-B pellets made of $38~75\;\mu\textrm{m}$ particles, the critical volume fraction of powders 0.7 was obtained with the pellet density which is 90% of theoretical density while the magnets of $75~150\;\mu\textrm{m}$ showed the density of 87% of the theoretical value with the same volume fraction. The nylon (i magnets with the addition of 0.5 wt. % silicon oil only exhibited the best magnetic properties to have $_{i}H_{c}=8.8\;kOe,\;B_{r}=5.1\;kG$ and $(BH)_{max}=5.2\;MGOe$ which are of world class. An empirical relationship in predicting the magnet density with a known fraction ($V_s$) of loading powders was obtained such as ${\rho}(g/cm^{3})=1.1+K.V_{s}$ where the K ranges over 5.3~5.6 be ing dependent upon the particle size loaded.

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Improvement of Removal Characteristics of Uranium by the Immobilization of Diphosil Powder onto Alginate Bed (다이포실 분말수지의 비드화에 의한 우라늄 제거특성 개선)

  • Kim Kil-Jeong;Shon Jong-Sik;Hong Kwon-Pyo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.4 no.2
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    • pp.133-138
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    • 2006
  • Chemical wastes containing small amounts of uranium can not be disposed of them after treatment as an industrial waste, because the uranium concentration in the final dry cake exceeds the exemption level. Especially for the removal of uranium in this study, the method for immobilizing Diphosil powder within alginate beads is adopted to make a bead form from a powdered resin. Sodium alginate bead itself showed a capability to uptake uranium to above 60%, but the value was decreased to below 30% after equilibrium. The adsorption rate of uranium increased with the increasing content of Diphosil in the sodium alginate bead. Diphosil resin itself showed very fast uptake of uranium from early stages, and then the rates were leveled off. Diphosil bead showed an improved capability to uptake uranium considering the pure Diphosil content in the composite bead, and provide a considerable potential for further applications of a continuous process by using Diphosil as a bead form.

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Analysis of Microstructures of Ni-based Amorphous Powders Prepared by Gas Atomization Process (가스분무법으로 제조한 Ni-계 비정질 분말의 미세구조 분석)

  • 김진천;배종수
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2003.11a
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    • pp.96-96
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    • 2003
  • 비정질 합금은 기존 결정질 합금에서는 얻을 수 없는 독특한 물리적, 화학적, 기계적, 전자기적 특성을 나타내는 것으로 알려져 있다. 비정질을 형성하기 위해서는 매우 큰 냉각속도가 필요하므로 제조 가능한 비정질 합금은 분말, ribbon, 박판 형태로 제한되어 있다. 최근 비정질 분말 제조 및 벌크 비정 질에 관한 연구는 많은 발전을 보아 왔지만, 아직도 고청정 비정질 합금 분말의 제조와 대량 생산화 관해서는 많은 연구가 요구된다. 본 연구에서는 고청정 Ni-Zr-Ti-Si-(Sn)계 벌크 비정질 분말을 가스분무법으로 제조하였다. 제조된 합금 분말은 각 입도 별로 구분하여, XRD 분석을 통하여 비정질 형성 가능 입도을 분석하였다. 분말의 외형은 SEM으로 분석하였으며, 미세구조는 TEM을 사용하였다. 열적특성은 DSC 분석으로 조사하였다. 또한 제조한 비정질 분말의 미세구조와 비교하기 위하여 Tg와 Tx 온도범위에서 열처리 한 분말의 미세구조를 분석하였다. XRD 분석 결과, 가스분무법으로 제조된 Ni-Zr-Ti-Si-(Sn) 분말 중에서 75$\mu\textrm{m}$ 이하의 분말은 비정질상을 가졌으며, 75$\mu\textrm{m}$ 이상의 분말은 결정질 또는 비정질의 혼합 상으로 구성되었다. 비정질 분말 회수율은 약 60% 이상이었다. 미세 TEM 분석에서 75$\mu\textrm{m}$ 이하 분말은 전형적인 비정질 Halo 형상을 보였으며, 결정질이 혼합된 분말은 비정질 기지상에 결정질 응고 수지상 조직이 혼합되어 있음을 확인하였다.

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An Evaluation of Flexural Behavior of Fume Pipe Repaired by Hybrid Concrete Repair Materials (하이브리드 콘크리트 보수재료로 보수된 흄관의 휨 거동 평가)

  • Yoo, Sung Won;Choi, Young Cheol
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.6
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    • pp.92-98
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    • 2019
  • In this study, we developed a repair material incorporating PVA powder resin and nylon fiber into cemented carbide used in the existing field to improve adhesion performance and water tightness with existing concrete. Flexural behavior evaluation was performed. The main experimental variables were PVA powder resin, nylon fiber mixing rate and damage type, and performance tests were conducted to evaluate compressive strength and flexural behavior after repairing materials. It was found that all formulations fully satisfied the required performance of the repair material. The flexural strength test results of the repaired tube specimens showed that the performance of the repaired materials was maximized when the nylon fiber was added and the PVA powder was added in an appropriate amount. The flexural behavior of all the specimens showed the flexural behavior of the structural members with a low rebar ratio, suggesting that the amount of iron wire in the domestic fume pipe was somewhat insufficient. That is, it was confirmed that the amount of reinforcement of the steel wire was somewhat small, so that the concrete was cracked before the behavior of the concrete and the steel wire reached the extreme state, and the concrete was immediately destroyed beyond the tensile strength of the concrete.

Development of Green Cement Type Grouting Materials with High Toughness and Non-Shrinkage Including Powder of Waste Tire and Resin (분말 폐타이어와 분말 수지를 함유한 환경친화적 고인성 시멘트계 무수축 그라우트재의 개발)

  • Park, Seok-Kyun
    • Journal of the Korea Concrete Institute
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    • v.19 no.5
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    • pp.623-630
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    • 2007
  • Grouting materials are used for the unification of superstructural and substructural body like bridge seat (shoe) or machinery pedestal and e.t.c by filling their intercalary voids. Accordingly, grouting materials have been developed and used mainly with products of high strength because those materials are constructed specially in a part receiving large or impact load. In this situation, the structural body constructed by grouting materials with high stiffness-centered (caused by high strength) products is apt to cause brittle failure when receiving over a limit stress and to cause cracks according to cumulative fatigue by continuous and cyclic load. In addition, grouting materials are apt to cause cracks by using too much rapid hardening agents that give rise to high heat of hydration to maintain high strength at early age. In this study, to overcome these problems, cement type grouting materials including powder of waste tire and resin as elastic materials which aim to be more stable construction and to be improvement of mother-body's unification are developed and endowed with properties of high toughness and high durability add to existing properties of high flowability, non-shrinkage and high strength. Besides, this study contribute to of for green construction materials for being possible recycling industrial waste like waste tire and flyash. On the whole, seven type mixing conditions are tested and investigated to choose the best mixing condition.

Self-Corrosion Protection of Polymer Cementitious Materials Using Terpolymer Powders with a Nitrite-type Hydrocalumite (아질산형 hydrocalumite와 터폴리머 분말수지를 병용한 폴리머 시멘트계 재료의 자기방청기능)

  • Hong, Sun-Hee;Kim, Wan-Ki
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2010.05a
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    • pp.73-76
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    • 2010
  • This study deals with the properties of polymer-modified mortars with a nitrite-type hydrocalumite, which are effectively used as intelligent patch materials for deteriorated reinforced concrete structures. The calumite is a material that can adsorb the chloride ions (Cl-) causing the corrosion of reinforcing bars and liberate the nitrite ions (NO2-) inhibiting the corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. Polymer-modified mortars using hydrocalumite and terpolymer powders are prepared with various calumite contents and polymer-binder ratios, and tested for corrosion inhibition. Subsequently, regardless of the polymer-binder ratio, the replacement of ordinary portland cement with the calumite has a marked effect on the corrosion-inhibiting property of the polymer-modified mortars.

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Insulation Property of Cement-based Non-combustible Inorganic Insulation Using MgO and Redispersible Polymer Powder (산화마그네슘 및 재유화형 분말수지를 사용한 시멘트계 불연단열재의 단열특성)

  • Son, Bae-Geun;Song, Hun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.120-121
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    • 2021
  • The organic insulation material has excellent thermal insulation property, but it is difficult to expect fire stability, and semi inorganic insulation only delays combustible hour but it is difficult to expect fire stability. In this study, thermal insulation property of cement-based non-combustible inorganic insulation using cement and non combustible materials and redispersible polymer powder was studied. As a result of the experiment, the thermal insulation property decreased as the use of redispersible polymer powder increased, but the heat insulation property improved when using the appropriate amount.

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Rapid Tooling (2) : Al Powder Filled Resin Tooling and Its Characteristics (급속금형제작 (2) : 알루미늄 분말 혼합수지를 이용한 간이형 제작과 그 특성)

  • 김범수;임용관;배원병;정해도
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.39-45
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    • 1998
  • In the previous study. the powder casting was attempted as the rapid tooling. The powder casting was the process to cast dry powder into the casting mold transferred from R/P model and infiltrate the liquid binder to solidify the powder. And then, the melted copper was infiltrated to control the shrinkage rate of the final mold Conseqently, the shrinkage rate was under 0.1% through that process. The mechanical characteristic was also excellent. Generally, in the slurry casting, the alumina powder and the water soluble phenol were mainly used. However, the mechanical property of the phenol was not good enough to apply to molds directly. In this study, aluminium powder filled with epoxy is applicated to the slurry casting to solve these problems. The mechanical and thermal properties are better than phenol because the epoxy is the thermosetting resin. We achieved a successful result that the shrinkage rate is shortened about 0.047%. Futhermore, the manufacturing time and cost savings are significant. Finally, we assume that the developing possibility of this process is very optimistic.

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A study on the Rapid Tooling Using Metal Powder Filled Resin (금속분말 혼합수지를 이용한 쾌속 형 제작에 관한 연구)

  • Kim, Peom-Su;Bae, Won-Byung;Jeong, Hae-Do
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.6
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    • pp.36-44
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    • 1999
  • The rapid Tooling technique is classified into two methods: one to directly utilize the model which was made by rapid prototyping technologies for dies, and the other to make a transferred type using the model as a master model and create dies and molds using it. In this study, the Al powder filled resin was made several mixed ratios and meshes sizes, and applied to slurry casting. And, variation of mechanical characteristics such as the shrinkage rate, the tensile strength, the elongation, the hardness, and surface roughness, are measured to compare. Consequently, as higher is the powder mixed ration and as smaller is the grain size of the power, the mechanical characteristics of the final mold are improved. Finally, the metal short fiber which can be fabricated easily and cheaply, if the self-excited vibration of an elastic tool, was also applied to slurry casting. It has been found tat the hardness gets higher, while the shrinkage rate lower, if mixed with short fiber.

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