• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.469-477
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• 2021

In this study, the mechanical property of anti-fouling coating using CNF was evaluated to prevent the durability and stability of structure exposed the marine environment. Anti-fouling coating using CNF was prepared by CNF, AKD and waste glass powder, and contact angle test, drying time, viscosity analysis and microstructure were performed. When coating on one number of times, It was showed to relatively high hydrophobic performance in steel. And It was confirmed that the contact angle increased as the content of AKD increased in cement mortar. When coating on three number of times, the surface was confirmed super-hydrophobic at maximum of 151.6°. When mixing waste glass powder, the surface was showed to relatively high hydrophobic. It is pseudo plastic fluid when CNF and distilled water were prepared in a ratio of 1:1, And Anti fouling coating is judged to be suitable for use as coating on marine structure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.27 no.5
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• pp.1-8
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• 2023

Marine and hydraulic structures are subject to durability damage not only due to the penetration of sea water but also due to the attachment of marine organisms. Therefore, in this study, we tried to develop an antifouling coating agent with self-cleaning function for marine concrete. It was confirmed that the antifouling coating agent mixed with AKD, cellulose nanofibers and BADGE had sufficient antifouling performance at a well hydrophobicity of around 140° in contact angle and an inclination angle of 15°. In the abrasion resistance test of the surface, only a maximum loss of 0.015 g occurred. In the durability test, as a result of the chloride ion permeation test, almost no chloride ion permeation occurred in the variable where the coating agent was applied, and carbonation and freeze-thaw damage also rarely occurred, so it was analyzed that it was effective in securing durability of concrete.

• Journal of the Korean Applied Science and Technology
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• v.34 no.3
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• pp.525-535
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• 2017

In order to produce hydrophilic coating solution, which has superior antifogging and antifouling effect on the glass surface of solar cell module as well as improving photovoltaic efficiency, nanosilica was dispersed in an aqueous solution of Tween 20 and fluorosurfactant composed of decafluorobutane and polyethylene glycol. The antifogging effect at high temperature was excellent for all the coating solutions containing nanosilica, but the antifouling effect was observed when the content of nanosilica was over 6 wt%. As the content of fluorosurfactant increased, the initial water contact angle slightly increased and the antifogging effect remained well until 500 wiping with wet $Wipeol^{(R)}$. The antifouling effect was also excellent regardless of the content of fluorosurfactant, thus 0.1 wt% of the fluorosurfactant was enough for a coating solution production. From the AFM results, when 0.1 wt% to 0.3 wt% of the fluoro surfactant was added, the fractal structure of the coated glass surface was clearly existed and contributed to the better antifouling effect. The transmittance of coated glass surface was highest in TL-1 coating solution containing 0.1 wt% of fluorosurfactant, and the addition of fluorosurfactant in a larger amount than 0.1 wt% did not improve the transmittance. This result is in good agreement with the previous AFM result which shows a high surface roughness as well as a fractal structure formation for the TL-1 coating solution.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.2
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• pp.120-129
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• 2023

Marine structures are subject to damage not only from sea salt but also from the adhesion of marine microorganisms and suspended particles, which cause additional damages. In order to prevent this, periodic coating is employed in the case of vessels to maintain the necessary performance. However, it is true that periodic coating is difficult for concrete or steel support structures, and there is a risk of marine environmental pollution. In this study, authors developed an anti-fouling coating agent using eco-friendly materials that possess hydrophilic cellulose nanofibers and AKD(alkyl ketene dimer). To achieve a homogeneous mixture, the content of cellulose nanofibers was fixed at 1 %, and AKD, distilled water, and waste glass were mixed using a digital mixer and homogenizer. The contact angle of the prepared coated surface was observed to be over 130°, indicating sufficient performance even in a water droplet flow test with a 15° slope, suggesting self-cleaning capability. Furthermore, through the analysis of viscosity characteristics at different temperatures, it was confirmed that the application is feasible at room temperature. Microstructure analysis also verified that the coating agent is uniformly applied to the concrete surface.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.275-278
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• 2012

This study try to finding the self-detergency performance of adherent pollutant on the mortar surface by using the developed silicate based antifouling coating material. Developed coating material coated on the surface of mortar test piece and after 30 minutes, over layed already coated mortar surface. After 7 days, the surface is polluted with crayons and oily magic marker. After 24 hours, contaminated area was wiped out the water. From the result of self-detergency performance test, it is concluded the developed material could be used as a detergent the contaminated concrete surface.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.31 no.3
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• pp.137-142
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• 2021

In this study, the development of the room temperature curable silica-based coating compositions for anticorrosive and antifouling performance in marine environments was carried out. The marine (plant) structures with many exposed parts are operated in harsh marine environments such as strong ultraviolet rays, extreme temperature differences and salt water corrosion. Organic paints that are easily degraded under these environments and easily eroded by physical stimuli such as waves can not play a role properly. Dense ceramic coatings on marine structures provide careful protections even in saltwater environments due to their high hardness and rust resistance. Therefore, in the case of ceramic coatings, their use and application range in marine structures can be greatly improved due to their functional advantages. In the present study, silica-based coating compositions based on colloidal silica with silane coupling agents, curing salts, and ceramic fillers were developed, and their applications as protective coatings for corrosion protection and fouling prevention in seawater were also studied.

• Polymer(Korea)
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• v.32 no.4
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• pp.397-402
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• 2008

Perfluoropolyether(PFPE) has been widely applied in industry because of its very excellent properties of very high contact angle and low surface energy, good lubricant property and antifouling property. But the difficulty to synthesize PFPE has limited the research on this field. In this study, the novel silicon-containing oligomer with perfluoropolyether moiety was synthesized, and the structure was characterized by $^{19}F$-NMR and $^1H$-NMR. The surface properties of contact angle, sliding angle, and soil release property were investigated. The results show that PFPE in this study can be utilized as an anti-smudge coating material because it shows lower sliding angle and better soil release property than commercial products.

• Proceedings of the Membrane Society of Korea Conference
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• 2004.05b
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• pp.156-159
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• 2004

TFEMA(2,2,2-trifluoroethylmethacrylate)는 광섬유 코팅제, 발수 발유제, 기능성 페인트, 방오가공제, 고분자의 표면개질제 등의 많은 응용제품에 활용되는 단량체로 그 시장규모가 국내에서 600억원, 전 세계에서 8,000억에 해당하는 고부가가치의 화학원료이다. TFEMA는 현재 산촉매하의 8.$0^{\circ}C$의 고온에서 TFEA(2,2,2-trifluoroethaol)와 MA(methacrylic acid)와의 에스텔화 반응으로 제조된다.(중략)

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.124.1-124.1
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• 2015

$TiO_2$는 화학적으로 안정하며, 인체에 무해하고, 살균특성 및 각종 유기물에 효과적인 분해력, 안정성 및 내구성들의 장점으로 인해 널리 사용되는 광촉매제로 알려져 있다. 최근 $TiO_2$는 유리에 접촉되는 물방울의 표면장력을 크게 하여 접촉각을 10도 이하로 유지시켜줌으로써 비가 오거나 청소를 위해 살수를 할 때 유리면에 얇은 수막을 형성시켜 광촉매 기능으로 분해된 유기질의 오염물질 및 유리표면과의 결합력이 낮아진 무기질의 오염원을 쉽게 제거해 주는 특성들로 인해 오염방지 코팅제로 많이 활용되고 있다. 그러나, $TiO_2$는 빛이 조사될 경우에만 친수특성을 나타낸다는 단점들이 있어 본 연구에서는 $TiO_2$에 $SnO_2$를 혼합한 박막을 증착하여 신뢰성을 향상시키고자 하였다. 또한 기존 $TiO_2$ 코팅막들이 주로 spray 또는 blade 방식으로 코팅되어 코팅된 막이 낮은 균일성과 내구성을 가지므로 본 연구에서는 RF-Magnetron Sputtering 방법을 이용하여 유리 기판위에 $(TiO_2)50(SnO_2)50$ 박막을 증착하였다. 제작된 박막은 유리에 적용될 경우를 감안해 광학적 특성을 분석하기 위해 Uv-vis Spectrometer 장비를 이용하여 투과율을 분석하였으며, $SnO_2$ 혼합에 따른 구조적 특성으로 주사전자현미경(Scanning Electric Microscope, SEM)을 통하여 박막의 결정상을 분석하였으며, 주사탐침현미경(Atomic Force Microscope, AFM)을 사용하여 표면 거칠기를 관찰하였다. 또한 광촉매 특성을 통한 친수성을 알아보기 위해 UV 램프를 사용한 후 접촉각을 측정하였다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.16 no.2
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• pp.82-87
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• 2013

Effects of material surface property, hydrophobic or hydrophilic, on the bio-fouling occurred on the bodies submerged in the sea water are investigated experimentally. 4 test models are used in the experiment, which includes aluminum foil in common use, AAO applied hydrophobic surface, HDFS coated hydrophobic surface and hydrophilic surface. Hydrophobic surfaces with numerous micro & nano-scale pillars on it seems to play very important role of preventing them from fouling in initial stage while the effects disappear in long term sense of fouling process. It is concluded that the surface hydrophobicity retards the initial fouling until the fouling thickness is smaller than the heights of the pillars on it but the effects diminish with the fouling proceeds so that the thickness grows bigger than the pillar heights.