Metallic effect pigments are used in a wide variety of coating applications. The AVL effect pigments are well known for their very performing metallic effects as well as functional performance in following fields:
Metallic Effect Pigments for Can Coatings:
Aluminium grades are used to conceal imperfections of the metal in the coatings of food and beverage cans. Only very fine aluminium effect pigments are suitable because of the very thin coating as well as the high coverage required.
The AVL range of fine aluminium effect pigments (powders and pastes) is most suited for the can coating requirements, in epoxy-phenolic and other formulations. The properties required including the particle size range, metallic effect, coverage, and electrical conductivity are optimal. Other solvents /carriers than methoxypropanol (PM) such as solvent naphta can be made available on request.
Note: Using a high rotation mixer may break the particles and as a result lower the shine and metallic effect. We therefore strongly recommend the use of a low rotation mixer (max. 50 RPM).
Metallic Effect Pigments for Industrial Coatings
The metallic effect finishes (special effects) combined with the excellent hiding power have resulted in the use of aluminium and gold bronze effect pigments for a wide variety of industrial coatings, including consumer goods, interior design, floor coverings ...
Metallic Effect Pigments for Aerosol Coatings
A fist rule for the use of metallic effect pigments in aerosol spray cans is that opening of the nozzle should be at least 3 x as large as the D90 particle size of the metallic effect pigment in the formulation. Metallic effect pigments Pastes for aerosol spray cans tend to have a very high solid content to reduce the quantity of solvent in the formulation (ie AVL Rich Pale gold 36/WS/90-10).
WATER BASED SYSTEMS
The AVL range of Aquastab products (in methoxypropanol or butylglycol) is very well suited for the requirements of water-based systems. When preparing formulations with the Aquastab range of products, please ensure that the Aquastab paste first is pre-dispersed with some water or alcohol in order to ensure a homogeneous mix prior to adding the rest of the formulation.
Note: Please ensure that only agitators of a low rotation (50RPM) are being used, as high-speed agitators tend to break the metallic particles and reduce the metallic effect after application. The diameter of the spray nozzle should be at least three times larger than the dimension of the largest particles.
Metallic Effect Pigments for Powder Coatings:
The AVL metallic effect pigments are best suited for free blending when preparing the batches to be sprayed, this in order to keep an optimal metallic effect and brilliance. Any extrusion involving the pigment will break the particles and reduce the metallic effect and other properties as a result. Please mix the effect pigments directly in the drum containing the monomer at the required 2-5% concentration.
Generally, finer grades are used to ensure a smooth and homogeneous texture of the substrate to be coated. Aluminium effect pigments will withstand the curing temperature of 180°C . The color of bronze effect pigments will be affected when the exposure to a temperature higher than 100°C is longer than 5 minutes. We recommend in such case to reduce the exposure in time when items are cured at a temperature higher than 100°C, until the optimal compromise is found between the curing temperature and time of exposure.
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