• Korean Chemical Engineering Research
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• v.55 no.5
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• pp.586-592
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• 2017

In this study, acrylic resins with solids content of 75% were prepared by addition polymerization of n-butyl acrylate (BA), methyl methacrylate (MMA), 2-hydroxypropyl methacrylate (HPMA) and acetoacetoxyethyl methacrylate (AAEM) monomers. At this time, the glass transition temperature ($T_g$) of the acrylic resin was changed to 20, 30 and $40^{\circ}C$, and the hydroxyl value (OH value) was changed to 60, 90 and 120. As a result, the viscosity of acrylic resin increased with increasing $T_g$ and hydroxyl (OH) value. The synthesized acrylic resin was designed to have a high cross-link density to maintain high elasticity and high durability. The crosslinked acrylic resin was used to prepare an acrylic urethane clear coating by curing reaction with a block isocyanate (Desmodur BL-3175). The physical properties of the clear paints were analyzed by measuring viscosity, adhesion, pencil hardness and $60^{\circ}$ specular gloss. Acrylic urethane clear coatings were prepared as specimens and evaluated for various properties to be applied as top coatings for coil coating. The prepared coatings were excellent in adhesion, excellent in $60^{\circ}$ specular gloss and pencil hardness, and eco-friendly.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.95-95
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• 2012

기존의 섬유부자재 생산은 피도물의 접점(고리자국)으로 핀홀(pine-hole)에 녹의 발생하여 제품고급화가 어렵고 작업 시 분진 발생 및 유기물질 배출로 열악한 실정이다. 국내 생산방식은 대부분 위와 같은 방식으로 생산하고 있으나 이는 불량률이 높고 열효율이 떨어지는 단점이 있다. 기존의 저가제품은 중국 및 후발국가의 추격으로 세계시장에서 경쟁력을 잃어가고 있으며 선진국의 경우 섬유부자재의 고급화를 위한 무접점 대형코팅 설비 생산 및 연구개발을 하고 있는 실정이다. 이에 본 연구에서는 무접점 코팅설비의 개발로 피도물에 접점이 없어 녹발생의 원인인 핀홀이 근본적으로 발생하지 않으며, 일괄생산체제를 도입하여 기존의 작업방법 대비 생산성이 향상되고 불량률 및 에너지사용이 감소되며, 또한 원천적으로 분진 및 유기용제 등의 유해물질 배출이 없는 기술을 확보하고자 한다. 개발된 장비의 평가 및 실제 생산현장에서 요구되는 성능을 반영하기 위해 기존 생산설비를 조사하였고, 기존 작업환경에 따른 불량률 및 생산성을 조사하였다. 새로 개발되는 무접점 코팅설비는 기존의 문제점이 보완되며, 에너지 효율 향상 및 작업환경 개선된 One-stop 공정으로 설계하였으며 그 특징은 아래와 같다. 도료 코팅을 위한 파우더 공급 및 제거 공정의 단일화로 생산성을 향상 시키면서 기존보다 분진발생이 거의 없는 도입부 개발 및 밀폐형 코팅부 도입을 통하여 불필요한 열원 낭비를 최소화 시킬 예정이다. 향후 개발된 각 단위 유닛의 최적화를 통한 생산성 향상 및 One-stop 공정에 따른 열효율 개선 및 에너지 사용 절감 효과를 알아보고 피드백하여 최종 개발품에 적용할 예정이다.

• Korean Chemical Engineering Research
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• v.54 no.2
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• pp.145-151
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• 2016

In response to the cavitation caused by the partial vacuum caused by the fluid flow, a paint was developed by dispersing the lamella-shaped glass-flake in resin for anti-cavitation. This composite paint was developed by using the inorganic filler (lamella shaped glass-flake) and the NBR (Acrylonitrile-butadiene rubber) which was modified epoxy resin. Especially, the glass-flake was a thin film with a thickness of about 100~200 nm and length of about $20{\sim}30{\mu}m$, the aspect ratio was about 200 to 300 times that of the plate-shaped. So the paint for anti-cavitation have shown excellent performance in corrosion resistance. The results of evaluating anti-cavitation performance was below, tensile strength $4.8{\sim}6N/mm^2$ or more, rupture elongation 30% or higher, abrasive speed $10mm^2/h$ or less. In particular, it showed more than twice the superior performance compared to existing advanced foreign products in anti-cavitation performance evaluation.

• Conservation Science in Museum
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• v.29
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• pp.133-152
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• 2023

This study references preceding studies to examine the history of paint application techniques using various paints in the past, with the aim to contribute to the long-term preservation of large military cultural heritage assets situated outdoors. To this end, the study compared the findings of preceding research with the findings of an analysis conducted on a H-13 helicopter housed at the War Memorial of Korea. Upon collecting and analyzing samples from three grounded WWII aircraft from above-ground by preceding studies, it was confirmed from each sample that the various chemical properties of chrome ensured the effectiveness of the protective coating. The compound was first tested as a corrosion-inhibiting pigment in the early 1940s and proved its excellent moisture-resistant properties over the course of 80 years, despite the deterioration of the paint layer and long-term exposure to the natural environment. For this reason, it has been widely used as a corrosion inhibitor for aluminum alloys in the aviation industry. In other word, the most widely-used material for preventing corrosion was an organic primer containing chromate. In this study, based on the paint analysis of a H-13 helicopter operated in the Korean War, it was shown that the second layer, consisting of the primer, contains chromium oxide (Cr₂O₃). In addition, it was estimated that red lead tetraoxide (Pb₃O₄) was used for the vehicle. Analysis results and data from previous studies can help to confirm the continued effectiveness of corrosion prevention function provided by chromate. Meanwhile, the result of infrared spectroscopy analysis confirmed the use of alkyd resin. In the future, comparisons with a more diverse range of artifacts will allow the identification of changes in the manufacturing technology of paints used to protect alloys from corrosion.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.72-72
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• 2003

전기 및 전자산업의 발달과 더불어 규석 관련 제품에 대하여 고기능성 초미립 분말이 요구되고 있으며, 한편으로는 취급과 활용성이 우수한 형상인 구형 분말을 요구하고 있다. 본 연구에서는 평균 입도 1.0$\mu\textrm{m}$이하의 규석 초미립 분말 제조기술 개발과 유기용매 및 계면활성제 등을 첨가하여 형상이 구형인 기능성 분말과 항균, 항곰팡이 효과가 우수한 교질 상태의 실리카를 제조하여 기능성 재료 및 코팅용 실란 등에 활용이 가능하도록 물리적 단순공정을 통하여 평균 입도 1.0$\mu\textrm{m}$이하의 초미립 규석분말을 제조함으로써 고무, 타이어, 토너, 도료, EMC(epoxy molding compound) 등의 충전제, 이형제, 연마재 등으로 활용이 가능하게 하였으며 제조된 규석 초미립 분말은 분산성이 양호하도록 spray dryer 방법으로 건조하여 각 제품에 알맞은 적용이 용이하도록 하였다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.358-359
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• 2019

철교나 석유비축기지 탱크저판 및 각종 매설관로 등 대부분 철 성분 골조는 시간이 경과하면 주변의 환경에 따라 부식이 급격히 일어난다. 이러한 철강재가 부식되는 철강재가 시설물의 주요 구성물이 되고 있는 시설물의 수명을 크게 단축시키는 주요원인이 되고 있다. 이에 대한 대비책으로 방청도료나 코팅을 이용하는 방법과 달리, 전기적으로 전위차를 같게 하여 부식을 방지하는 전기방식법을 적용함에 있어 방식전류가 불균일한 경우 양극 소모가 불균일함에 따라 교체시기 문제를 극복하기 위해 회로 등가 임피던스 추정 및 RF 릴레이 장착한 TB를 이용한 방식전류제어장치를 개발하였다.

• Journal of the Korean Solar Energy Society
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• v.31 no.6
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• pp.95-102
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• 2011

The purpose of study is to estimate heating, cooling load performance and economic efficiency in office building with applied the functional paint. this paint can reduced SHGC(Solar Heat Gain Coefficient) on the glazing surface by coating. In this study, estimated to compared with double glazing, low-e glazing, IP(Insulation Paint) and IPu(Insulation UV-Cut Paint) coating glazing. As a result of this study, 1)heating & cooling load Analysis, SHGC value and U-factor of double glazing is about 0.70 and 3.29($W/m^2K$). low-E glazing is about 0.65 and 2.70($W/m^2K$). Two-side it is about 0.27 and 3.25($W/m^2K$). When compared to double glazing, annual heating & cooling load of low-E glazing, Two-side IPu and IP paint coating glazing is 3,012MWh($124kWh/m^2$), 2,910MWh($120kWh/m^2$), 2,867MWh($118.4kWh/m^2$) and 2,867MWh($118.4kWh/m^2$). It i sreduced to 2.0%, 5.2%, 6.7%, and 6.7% respectively. 2)the estimation of economic efficiency, low-e glazing installed in office building can not recover the investment within a lifetime 40years. but IPu and IP paint, two-side coating in glazing, have a payback period of 13 years respectively.

• Journal of the Korean Applied Science and Technology
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• v.31 no.4
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• pp.595-601
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• 2014

The microstructures of NATM were examined by SEM, FT-IR spectra, tensile properties, mole % of [NCO/OH], and particle size analyzer. Growing concerns in the environment-friendly industries have led to the development of solvent-free formulations that can be cured. We had synthesized NATM(New Austria Tunnel Method) resin having the ability to protect stainless steel against corrosion. Comparing with general NATM resin and coatings, this resin that synthesized with polyurethane and epoxy was highly stronger in intensity and longer durability. Hybrid resin was composed of polyols, MDI, epoxy, silicone surfactant, catalyst and crosslink agent, and fillers. Moreover, fillers such as fume silica not only accelerated the curing rate but also improved the physical property as thermal barriers. The rigid segments of synthetic resin in mechanical properties were due to fume silica and the increase the mole% of [NCO/OH] for corrosion protection. In conclusion, the hybrid resin microstructure with crosslink agent and fume silica are good material for thermosetting coating of metal substrates such as stainless steel.

• Korean Chemical Engineering Research
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• v.43 no.1
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• pp.1-8
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• 2005

In this study, $TiO_2$ powders were prepared by hydro-thermal synthesis with titanium tetra isopropoxide. The prepared $TiO_2$ and the commercial $TiO_2$(P-25, Degussa) were by impregnating $H_2PtCl_6$ solution or the leached solution from the waste catalytic converter of automobile. Modified photocatalysts were analyzed by ICP-AES, UV-DRS, XRD, SEM. And band-gap energy of modified photo-catalyst was found to decreased to 1.76eV and basic structure was changed upon modification by leached solution. Modified photocatalysts were coated on the wallpaper after using mixed solution with adhesive materials(PVC). And then to know the modified photo catalysts tested the reactivity and quantum efficiency in the mixed gas with NO as reactants in the photo catalytic reactor. In the gas phase, photo-catalytic activity of NO was the highest for modified P-25 catalysts(P-25(w)) that P-25(w) was impregnated by leached solution of wasted catalytic converter.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.9
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• pp.357-370
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• 2015

Massive data occurred in a manufacturing place is able to fulfill very important roll to improve the manufacturing process. Domestic manufacturing business has been making an multilateral effort to react the change of manufacturing circumstance, but it undergoes many difficulties due to technical weakness. Coatings is a type of paint. It protect products by forming a film layer on the products and assigns various properties to those. The research of coatings is one of the fields studied actively in the polymer industry. The importance of the coatings in various industries is more increased. However, the industry still performs a mixing process in dependence on operator's experiences. In this paper, we propose a design for realtime monitoring system and data analysis verification TA to improve the manufacturing process using HW-SW integrated framework. Analysis results from the proposed framework are able to improve the coatings formulation process by collecting more quantitative reference data for work and providing it to work place. In particular, the framework may reduce the deterioration and loss cost which are caused by absence of a standard data as a accurate formulation criteria. It also may suggest a counterplan regarding errors which can be occurred in the future by deriving a standard calibration equation from the analysis using R and Design of Experiments about an error data generated in the mixing step.