• Title, Summary, Keyword: hard coating

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Improvement of the Corrosion Resistance of PVD Hard Coating/Substrate Systems - Recent Developments -

  • Jehn, Hermann A.;Kang, Sung-Goon
    • Journal of the Korean institute of surface engineering
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    • v.32 no.3
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    • pp.472-483
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    • 1999
  • Hard coatings playa continuously increasing role in the field of tribology as well as for decorative applications. In both areas they are often also exposed to corrosive media. While especially hard nitride coatings show a high corrosion resistance for themselves, hard $coating_strate systems may suffer from a severe corrosion attack due to the defects in the coating structure (pores, pinholes) resulting from the PVD-typical film morphology. While a huge number of investigations cover the tribological properties, only limited studies deal with the corrosion behavjour of coating substrate systems and attempts are made to improve their corrosion resistance. The present paper shortly describes the corrosion mechanisms and repots characteristic examples of the system behaviour. Special emphasis is laid on recent investigations to improve the corrosion resistance by alloying, interlayers or multilayered coating structures.es.

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Synthesis of Hard Coating Solution for Plastic Display Plate (플라스틱 디스플레이 기판용UV 하드 코팅 용액의 합성)

  • Back, Sung Kyun;Jang, Sun Ho;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.1
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    • pp.45-51
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    • 2017
  • Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer netwoked nanoparticles were prepared to synthesize hard coating solution by reaction with diisocyanates. The diisocyanate combined siloxane hard coating solution showed more flexibility than the siloxane solution. In addition, diisocyanate resulted in improvement of curl property and surface hardness in the siloxane solution. Of the used diisocyanates, isophorone diisocyanate and acryloyloxy ethyl diisocyanate were good for UV hard coating solution. This effect will decrease brittleness in the siloxane solution using for plastic display plate.

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Preparation and Properties of UV Curable Hard Coating Materials on PET (자외선 경화형 고경도 PET 필름의 제조 및 특성)

  • Kim, Hyunjoon
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.1
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    • pp.35-41
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    • 2014
  • UV curable transparent hard coating materials have been developed to improve the mechanical and optical properties of PET substrate. The coating materials were synthesized using various urethane acrylate oligomers, monomers, photo initiators, and leveling agents. The materials were coated on PET substrates and UV cured. The hard coated PET films were shown to have the good scratch resistance and transparency. When the urethane acrylate oligomer with more functional groups was introduced into the coating solution, the mechanical and optical properties were improved. However the higher concentration of 9-functional oligomer resulted in the decrease of workability. The addition of trimethylolpropane ethoxylate$(EO/OH)_9$ triacrylate(TMPETA) to coating solution improved the workability and properties. As a result, the UV cured film from the formulation of urethane acrylate oligomer with 9-functional groups, TMPETA as a monomer, IRACURE 754 as a photo initiator and BYK-340 as a leveling agent showed the best mechanical and optical properties in this study.

Formulation and Application of UV-Cured Hard Coating Compounds for PVC Tile (PVC 바닥상재용 광경화형 하드 코팅액의 제조 및 응용에 관한 연구)

  • Park, Bo-Ram;Yoon, Hyun-Jung;Zhao, Hong;Ha, Jin-Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.9
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    • pp.2396-2401
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    • 2009
  • This study is on development of UV-cured hard coating compounds which have more improved abrasion resistance than existing UV-cured urethane-acrylic resin, to prevent a surface of a widely used PVC tile as a constructive material from being scratched. To make a high abrasion resistant hard coating solution compared to UV-cured urethane-acrylic resin which has no abrasion resistance and been used for PVC tiles, we added powder substances of different abrasion resistant level, $Al_2O_3$(Al-160SG-3), $Al(OH)_3$(SH-8W), $SiO_2$(KS-5000), etc., to the resin, changing their contents from 10% to 30% against quantities of resin, and compounded it using Ring-Mill. After coating PVC tiles with the hard coating solution using bar-coating method that can adjust a thickness, we estimated some surface properties-abrasion resistance, pencil hardness, adhesive power, thickness of coating, and so on. As a result, a hard coating solution added 30% $Al_2O_3$ powder to the resin had the finest surface properties-the first grade in abrasion resistance, H in pencil hardness, 100% in adhesive power, and a hard coating solution which showed excellent solidity and abrasion resistance has smaller particle size, higher powder content, and thicker coating thickness.

METALLIC COATING PROTECTION ON DIELECTROMAGNETS PREPARED FROM MIXTURE OF HARD MAGNETIC POWDERS

  • Slusarek, Barbara;Wasenczuk, Andrzej
    • Journal of the Korean Magnetics Society
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    • v.5 no.5
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    • pp.687-689
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    • 1995
  • Our team works on mixture of hard magnetic materials. As hard magnetic material we used mixture of powders: melt-spun ribbon Nd-Fe-B, ferrite and Alnico. Their different mixtures are basic material for dielectromagnets under our investigation. Main disadvantage of dielectromagnets with Nd-Fe-B alloy powder as a component is a low corrosion resistance. Protection against corrosion is covering dielectromagnets with metallic or organic coating film. The coating film protects dielectromagnets from free particles on the surface and low resistance for mechanical stresses too. The surface of dielectromagnets prepared from mixture of powders if formed by metallic particles - powder of Nd-Fe-B and Alnico, particles of oxide - powder of ferrite and particles of resin - bonding materials. Team work on technology of laying the metallic coating on dielectromagnets prepared from mixture of mentioned powders. Papers show the results of initial investigation on metallic coating technology. It shows influence of type and used technology of the metallic coating film on magnetic properties of dielectromagnets.

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The Physical Properties of Polycarbonate Films Coated with Hard and Color Coating Materials (내마모성 색상코팅제를 코팅한 폴리카보네이트 필름의 물리적 특성)

  • Kim, Hyunjoon
    • Korean Chemical Engineering Research
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    • v.47 no.3
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    • pp.316-320
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    • 2009
  • UV curable hard and color coatings were formed on polycarbonate(PC) films. The coating materials were composed of a commercially available end-capped polyester(EB830), diacrylate monomer(HDDA), silicon acrylate, photoinitiator, and organic dye as a coloring agent. The surface properties of coating films were evaluated, and the influences of the compositions of coating materials were investigated. The coating films showed high transmission and good adhesion between coating layer and PC substrate. And the coating films exhibited higher hardness than bare PC film. The coating films with various colors were obtained by wet process, and the clear and color window lenses for mobile phone were prepared successfully.

Rheological perspectives of industrial coating process

  • Kim, Sun-Hyung;Kim, Jae-Hong;Ahn, Kyung-Hyun;Lee, Seung-Jong
    • Korea-Australia Rheology Journal
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    • v.21 no.2
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    • pp.83-89
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    • 2009
  • Coating process plays an important role in information technology such as display, battery, chip manufacturing and so on. However, due to complexity of coating material and fast deformation of the coating flow, the process is hard to control and it is difficult to maintain the desired quality of the products. Moreover, it is hard to measure the coating process because of severe processing conditions such as high drying temperature, high deformation coating flow, and sensitivity to the processing variables etc. In this article, the coating process is to be re-illuminated from the rheological perspectives. The practical approach to analyze and quantify the coating process is discussed with respect to coating materials, coating flow and drying process. The ideas on the rheology control of coating materials, pressure and wet thickness control in patch coating process, and stress measurement during drying process will be discussed.

The Influence of Soft/Hard Segment Composition and Content on the Abrasion Resistance of Polyurethane Coating Agents (폴리우레탄 코팅제에 있어서 Hard Segment와 Soft Segment의 조성 및 함량변화가 내마모성에 미치는 영향)

  • Son, Hyung-Suk;Jeon, Dong-Geun;Park, Seong-Jin;Kim, Yong-Sung;Kwon, Kwi-Teag;Kim, Ki-Soo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.5
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    • pp.5-12
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    • 2014
  • Weatherstrip coatings of urethane and silicon type which are fit to EPDM and thermoplastic materials are used in sealing systems for automotive applications for noise reduction and high slip characteristics for external applications, respectively. Polyurethane binder was successfully synthesized from poly(butyladiphate)diol (PBAD), poly(tetramethylene)glycol (PTMG) and isocyanate as starting materials. Then, polyurethane coating agents were prepared by using various additives. To investigate effects of segment types on the abrasion resistance of polyurethane coating agents, thin films based on polyurethane coating materials were fabricated. With increasing the amount of hard segment in the coating agent, abrasion resistance, modulus and tensile strength of the coating films were improved, but the elongation of the coating films was decreased.

Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method (Colloidal Silica가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향)

  • Shin, Yong Tak;Lee, Min Ji;Cho, Kyung Sook;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.535-540
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    • 2011
  • Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and ${\gamma}$-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were prepared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.

Hard Coatings on Polycarbonate Plate by Sol-Gel Reactions of (3-glycidoxypropyl)trimethoxysilane and Colloidal Silica (폴리카보네이트 판 위에 (3-glycidoxypropyl)trimethoxysilane과 Colloidal Silica의 졸-겔 반응을 이용한 하드 코팅)

  • Kim, Ju Youn;Oh, Mee Hye;Yoon, Yeo Seong;Shin, Jae Sup
    • Journal of Adhesion and Interface
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    • v.8 no.2
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    • pp.1-8
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    • 2007
  • The hard coatings on the polycarbonate plate were performed with the object of substitution the glass in the car to the polycarbonate plate. In this research, (3-glycidoxypropyl)trimethoxysilane (GPTMS), colloidal silica (CS), and (3-aminopropyl)triethoxysilane (APS) were used to prepare the coatings by sol-gel process. The optimum conditions and formulation to get the excellent physical properties of the coating were determined. GPTMS and CS were hydrolyzed in ethanol, and then APS was added in this solution. Using these solution the hard coating were applied to the polycarbonate plate. The smooth coating which got the 2 H class in pencil hardness was formed. And this coating showed excellent abrasion resistant and adhesion property.

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