Abstract
Matt polyurethane coating was successfully prepared through the synergistic effect of castor oil and phenolic epoxy resin into polyurethane backbone. The formation mechanism may be ascribed to the modulus mismatch between the partially modified epoxy polyurethane and partially unmodified polyurethane. Scanning electron microscopy (SEM) was used to observe the micro-rough surface morphologies. Atomic force microscopy (AFM) and three-dimensional (3D) surface profilometer were applied to calculate a series of surface roughness parameters in different dimensions, such as Sa, Sq, Sp, Sv, Sz, Sku, Ssk, etc. The exciting results of this paper—the correlation of surface roughness on measurement length and gloss—are explored in detail. It reveals the extrinsic property of measured roughness with measurement length and provides guidance for what kind of incident angle gloss meters (20°, 60°, and 85°) best describe the gloss of matt polyurethane coating.
Highlights
Gloss is an optical property that indicates how well a surface reflects light in a specular direction
We demonstrated a simple method to develop a micro-rough surface of a coating by buckling and wrinkling formation as a consequence of mechanical instability produced upon cross-linking of polyurethane with an epoxy resin
We examined the surface roughness using atomic force microscopy (AFM) and three-dimensional (3D)
Summary
Gloss is an optical property that indicates how well a surface reflects light in a specular (mirror-like) direction It is one of the most important indicators used to describe the visual effect of an object [1,2,3,4]. Measured (effective) roughness is dependent on the available measurement scale and the sampling interval of the measurement technique This makes measured roughness essentially an extrinsic property. We established the relationship between the gloss and surface roughness Taking their mutual relationships into account can provide guidance for what kind of incident angle gloss meters (20◦ , 60◦ , and 85◦ ) are best suited to describe the specular gloss of matt polyurethane coating
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