• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.579-587
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• 2003

A lot of VOCs that is noxious ate exhausted at drying process of enamel coating device. This VOC gas can be incinerated perfectly through catalytic combustion, and heat that is occurred in incineration process ran be again used in drying process. By using VU catalytic combustion technology, in this study, we developed a enamel coating machine that have an excellent environment improvement and energy saying effect. As basic research for this development characteristics ana performance of catalytic combustion for VOC gas was evaluated and numerical analysis for drying oven was calculated. According to the result, VOCs combustion characteristics of metal form catalysis was excellent in high temperature, and it was seen that enamel coating machine should be designed as a precious controllable structure of recirculating supply rate and suction rate.

• Journal of the Korea Institute of Building Construction
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• v.14 no.6
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• pp.505-513
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• 2014

The purpose of this study is to evaluate the corrosion protective properties of a Zn-Sn metal spray method according to the contents of Zn and Sn by a CASS test and the electrochemical theory. In the experiment, the CASS test and the electrochemical test were conducted to investigate the corrosion protective property of the Zn-Sn Metal Spray system, the Zinc galvanizing system, and the heavy duty coating system. As a result, it was confirmed that the Zn-Sn (65:35) Metal Spray system had very high corrosion protective property through the electrochemical characteristic as comparison with the other anti-corrosion systems and was very effective to prevent steel products from corrosion.

• Membrane Journal
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• v.23 no.2
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• pp.129-135
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• 2013

To recover of volatile organic compounds (VOCs) induced by painting process, we prepared separation system using hollow fiber membrane modules and evaluated the recovery performance of VOCs with different feed pressure and operating time. Concentration of volatile organic compound in permeate through the membrane increased with increasing operating time and pressure. Performance of the membrane for removing the VOCs when we applied 2-stage process showed better performance than that of single stage process.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1363-1364
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• 2011

• Journal of the Korea Concrete Institute
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• v.20 no.5
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• pp.635-642
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• 2008

In recent years, epoxy-coated reinforcing bars have been widely used in order to prevent the corrosion of ordinary reinforcing bar. However, they have a bad balance between performance and cost. Especially, they have a brittleness properties, low bond strength to cement concrete and no good bend-ability in the field. The purpose of this study is to evaluate the tensile properties and adhesion of hybrid-type anti-corrosion polymer cement slurry (PCS). PCSs are prepared with four types polymer dispersions using fly ash and silica fume, and tested for proper coating thickness, tensile properties, adhesion to steel plate and bend-ability. From the test results, the viscosity of PCS is effected by polymer dispersion types, and is a little decreased by using fly ash. The coating thickness of PCS has a proper thickness at polymer-binder ratio of 100%. It is apparent that the coating thickness has various values according to viscosity of PCS, water-binder ratio and polymer-binder rato. PCS has a good various anticorrosion properties and physical properties such as tensile strength, adhesion and bend-ability. It is also recommended that proper coating thickness to reinforcing bar is in the ranges of 150 to $250{\mu}m$ for bond strength, adhesion and bend-ability. It is also expected that the coated reinforcing bar using PCS is widely used instead of epoxy coated reinforcing bar in the industrial field.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.41-41
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• 2018

안정적이고 효율적인 전력 공급을 위해 번화가 대로변 주변에 다수의 지상 변압기 및 개폐기가 설치되고 있으며, 이로 인해 불법 부착물로 인한 도시의 미관 훼손, 변압기 및 개폐기의 오염 등의 문제가 발생하고 있다. 따라서 각 산업체 및 연구 기관에서는 부착 방지용 코팅 도료 및 시트에 대해 다양한 연구개발을 진행하고 있으며, 현장에 적용되고 있는 사례도 있다. 하지만 현재 현장에 적용된 대부분의 제품들은 약 1년 정도의 시간이 지나면 고유의 기능을 상실하며, 도료 및 시트와 기판 사이의 박리가 일어나 우수한 성능을 보이지 않아, 결과적으로 도시에 더욱더 악영향을 주고 있다. 이러한 원인으로는 도료 및 시트의 성능 평가를 위한 다양한 규격들이 존재하지만, 테이프류 탈착 시 영향을 주는 인자(Factor)들이 명확하게 설정되어 있지 않고, 이에 대해 면밀하게 분석한 자료가 없으며, 정량적이고 객관적인 시험 방법이 고려되지 않고 있기 때문에 좋은 제품을 선별하기 어려운 상황이다. 따라서 여러 가지 제품들의 비교평가 및 기술 개발에 활용할 수 있는 가이드라인을 제시하기 위해 일반적으로 사용되고 있는 면테이프(Duct tape)를 이용하여 기판(Substrate)에 대해 다양한 인자를 기준으로 탈착 특성을 측정 및 평가하였다. 현재 지상 배전함 및 개폐기는 분체도장(Powder coating)으로 구성되어져 있으며, 그 모재는 탄소강(Carbon steel)으로 이루어져 있고, 소수의 경우 스테인리스(Stainless steel)를 사용하기 있기 때문에 분체도장(Powder coating), 탄소강(Carbon steel), 스테인리스(Stainless steel)를 기판으로 선정하여 탈착 특성을 평가했다. 탈착 특성에 관여하는 요인으로는 탈착 각도(Peeling angle), 탈착 속도(Peeling speed), 표면 조도(Surface roughness) 등이 있고, 상대 습도(Relative humidity)의 경우 탈착 특성에 영향을 거의 주지 않는 것을 확인했다. 탈착 시 각도가 클수록, 속도가 빠를수록, 조도가 작을수록 부착력(Peel resistance, N/cm)과 탈착 에너지(Energy, J)가 커지며, 탈착 특성에 영향을 주는 인자를 바탕으로 95% 신뢰도 구간을 적용한 탈착특성 모델링을 제시하였다. 이 모델링을 이용하여 실제 현장에서 발생할 수 있는 다양한 각도($90^{\circ}$, $180^{\circ}$)와 속도 범위(100 ~ 1500mm/min)에서의 탈착 특성을 추정하는 것으로, 좋은 성능 및 내구성을 가진 제품을 효과적으로 선별한다.

• Journal of Energy Engineering
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• v.14 no.2 s.42
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• pp.133-139
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• 2005

An activated carbon-photo catalysis hybrid system is proposed for the treatment of VOC produced from paint booth. and its VOC removal performance is experimentally evaluated. Activated carbon tower is designed on the basis of the adsorption characteristics of toluene. Photocatalytic system is designed as the series of $TiO_2/SiO\_2$ fluidized bed reactor and $TiO_2$-coated filters. The present activated carbon-photo catalysis hybrid system shows the VOC removal efficiency within $75\~100\%$ under different VOC species and concentrations.

• Journal of the Korea Concrete Institute
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• v.19 no.5
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• pp.639-646
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• 2007

This study performed several tests for the durability of the concrete coated with nano synthesis ceramics which do not contain volatile organic compounds harmful to environment. The tests were adhesion test on dry and humid concrete, SEM test, MIP analysis, carbonation, chloride diffusion by electronic facilitation, freezing-thawing resistance, alkaline resistance, and brine resistance test. In the adhesion test on dry and humid concrete, nano synthesis ceramics coating produced the highest results among all the coatings tested. Nano synthesis ceramics adhered solidly on the concrete surface. The adhesive strength seemed to result from the hydrogen bond between nano synthesis ceramics which are inorganic and generated by hydrolysis and re-condensation reaction and the concrete's hydrates such as calcium silicate aluminate or calcium silicate hydrate. SEM test and MIP analysis results show surface structure with finest crevices pore in the nano synthesis ceramics coating applied concretes. In the carbonation, chloride diffusion, and freezing-thawing resistance tests, the concretes with nano synthesis ceramics coating indicated the best results. Based on these test results, further progress in application of nano synthesis ceramics coatings to various concrete structures including costal structures and sewerage arrangements can be expected.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.05a
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• pp.749-754
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• 2002

The safety and serviceability of concrete structures are influenced by corrosion of steel bars in concrete. Several methods have been available to protect the reinforcing bars from corrosion. Among them, the surface coating method is one of the easiest way to apply to concrete structures. However, the realistic guideline for surface coating materials has not been established yet in this country. In this study, in order to establish a reasonable technical guidelines which include the test method, quality criteria, and construction method, the performances of surface coating materials were evaluated.

• Journal of Adhesion and Interface
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• v.24 no.2
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• pp.69-75
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• 2023

Recently, the application of paint protection films (PPFs) for automobiles having a self-recovery coating layer has been grown up. In this study, we report the evaluation results on the basic physical properties of a poly(vinyl chloride)- based PPF containing poly(urea-urethane) hybrid self-recovery coating layer. Depending on the main chemical composition and the thickness of poly(urea-urethane)-based coating layer for PPF, the self-recovery performance by an optical microscope and the stain resistance through color difference value are measured. To improve the surface properties and show its easy-cleaning effect against the polluted things, silicone-modified polyacrylate is introduced to the self-recovery coating composition. The contact angle of water on the coated surface is confirmed to show its hydrophobic surface. Finally, accelerated weathering test of paint protection film with poly(urea-urethane) hybrid coating layer is performed to check the possibility of discoloration and deformation due to long-term exposure on harsh condition.