Which Factors Affect the Gloss of Paint?

From:Linshang     Time:2017/8/28 11:58:13     Browse:
Gloss(sheen) is an optical property which indicates how well a surface reflects light in a specular (mirror-like) direction. It is an important parameters that can be used to describe the visual appearance of an object.

Gloss(sheen) is an optical property which indicates how well a surface reflects light in a specular (mirror-like) direction. It is an important parameters that can be used to describe the visual appearance of an object.

 
Some factors that affect the gloss of paint are as follows:


       1.The gloss(sheen) level of a paint is mainly determined by the ratio of resinous, adhesive binder which solidifies after drying, and solid, powdery pigment. The more binder the coating contains, the more regular reflection will be made from its smooth surface; on the contrary, with less binder, grains of pigment become exposed to the surface, scattering the light and providing matte effect?

2.To a lesser extent, gloss will also be affected by some other factors: refraction index of the pigment particles, viscosity and refraction index of the binder.An important indicator is pigment-volume concentration (PVC), defined as the ratio of pigment volume and total paint volume. 

PVC affects both physical and optical properties of a paint. Matte paints have less binder, which makes them more susceptible to mechanical damages (however, they are less visible than on glossy surfaces). More binder provides a smoother and more solid surface. However, at a certain PVC, called critical PVC (CPVC), the paint is already saturated with binder and the surface becomes solid and glossy, without protruding particles; adding more binder (lowering PVC) will not affect the gloss. CPVC generally depends on the binder-pigment system used, and generally falls in the 35-65% range.

As a gloss finish will reveal surface imperfections such as sanding marks, surfaces must generally be prepared more thoroughly for gloss finishes. Gloss-finish paints are generally more resistant to damage than flat paint, more resistant to staining, and easier to clean. Flat paint may become glossier through burnishing or staining with grease; glossy paint may lose its gloss and look scratched if abraded. Unlike gloss paint, flat paint can generally be touched up locally without repainting the entire surface.

Gloss level can be characterized by the angular distribution of light scattered from a surface, measured with a gloss meter, but there are various ways of measuring this, and different industries have different standards.

LS192 Gloss meter is researched and designed by Linshang Technology,it can be used in the fields of paint coatings, decorative materials, building materials, plastic materials, ceramic products, stone products, wood products, leather products, film-coated paper towel, printing ink, car maintenance, molding tool, metal coating, etc. 


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