Nail Varnishes and Nail Lacquers
Most nail varnishes or lacquers are made by liquefying cellulose nitrate in solvents and then adding color pigments and other elements — such as resins and thickeners — to give the final product the right material properties. Bentonite can be used as a waterproofing agent, for example, to create a stable suspension of colorants.
Uniformly Dispersed Colorants
An important technique in nail varnish production is homogenization, which has two main applications: first, the process can be used to reduce the particle size to make the colorant dispersion more uniform; and, secondly, it enables the correct density and viscosity to be achieved, which makes the final product easy to apply.
GEA’s high pressure homogenization technology offers significant benefits regarding the optimisation of product texture, making it more elastic and malleable. In addition, advantages can also be gained concerning color density: reduced particle sizes mean that, as a result of light refraction, pigment particles gain both brilliance and brightness.
Laboratory tests have shown that high pressure homogenization is able to guarantee these effects on an industrial scale, as long as some important production parameters are considered: a pressure of 850 bar is needed, and a two-stage procedure is required, with one or two passes through the homogenizer.