Effect of nano layered silicates on automotive polyurethane refinish clear coat

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• 作者：Behdad Ahmadi ; Mahmoud Kassiriha ; Khosrow Khodabakhshi ; Ehsan R. Mafi
• 关键词：Nano layered silicate ; Nano-composite ; Clear coat ; Polyurethane ; Scratch resistance
• 刊名：Progress in Organic Coatings
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：60
• 期：2
• 页码：99-104
• 全文大小：735 K

文摘

In the present investigation, effect of nano layered silicates on the properties of an automotive refinish clear coat based on polyurethane has been studied. Observation by means of X-ray diffraction (XRD) technique indicates the presence of a partially intercalated structure due to dispersion of nano layers in the polymer matrix. Some levels of hazing have been established by increasing the amount of nano-filler. The effect of nano-filled clear coat on the reflectance spectra of a metallic coated substrate has been studied under three different light sources using a goniospectrophotometer and compared with a blank clear coat to determine if it can be identified by human eye. Scratch and mar resistance tests showed significant improvement even 48 h after application, when there was no gloss reduction due to usage of nano-filler. Gloss retention was increased by about 10 % in presence of only 3 wt % of nano-filler. In addition to some scratch and mar resistance tests, other standard tests like adhesion, impact and bending were performed to find out optimum nano-filler/polymer ratio.