Metallic paint
As metal-effect coating , and metallic paint or metallisé refers to coatings having a metallic glossy effect. Metal effect paints first appeared in the 1960s, but only later became widely used.
effect
The effect is created through the use of ground mica , a mineral sheet silicate or metallic effect pigments . These pigments are also included in the paint formulation. Besides mica, the most important representatives are aluminum and brass . Another form of effect lacquer is the interference lacquer (colloquially also flip-flop lacquer), which shows different color tones depending on the perspective ( color flop ). This effect is obtained by using interference pigments . Pearl coating materials are determined by the addition of pearlescent pigments produced. These generate a particularly strong brightness flop, i.e. a strong angle-dependent difference in brightness. These effect lacquer variants cannot be strictly differentiated from one another, since it is common to use different types of effect pigments in the same lacquer.
application
Metallic paints are usually two-layer paints. They consist of a layer of lacquer, which contains the effect and colored pigments, as well as a second layer, the clear lacquer , which is then applied . Whereas in the past solvent-based paints were generally used for the coloring layer, in modern vehicles this consists almost exclusively of water-based paints ( acrylic paints ). Solvent-based systems are usually used for clearcoats.
Strictly speaking, the term two-layer paint is not correct for use in the automotive sector (see car paint ), since paints for automotive series painting consist of four layers, specifically a primer (often performed as cathodic dip painting , KTL for short), filler, basecoat and clear coat. The term two-layer paint refers to the combination of basecoat and clearcoat, which is also common in non-automotive applications.
costs
A frequently heard rumor is that metallic coatings have higher manufacturing costs than existing only one layer Uni-coatings and therefore in most car manufacturers extra charge, special equipment is. In fact, most automobile manufacturers apply all colors, regardless of the use of effect pigments, in a multi-layer process. This is due to the operations in the clearcoat surface properties such as gloss , history and UV protection for the underlying layers.
See also
Web links
Individual evidence
- ↑ a b c d U. Poth: formulating car paints ; Vincentz Network; 2007; ISBN 387870335X .
- ↑ a b c B. Müller, U. Poth: Paint formulation and paint recipe: The textbook for training and practice ; Vincentz Network; 2006; ISBN 3878701705 .
- ↑ A. Goldschmidt, H. Streitberger: BASF Handbook Painting Technology ; Vincentz Publishing House; Hanover; 2003; ISBN 3-87870-324-4 .