Keywords
Citation
Bean, J. (2001), "Water-based primer for powder coatings", Pigment & Resin Technology, Vol. 30 No. 3. https://doi.org/10.1108/prt.2001.12930caa.003
Publisher
:Emerald Group Publishing Limited
Copyright © 2001, MCB UP Limited
Water-based primer for powder coatings
Water-based primer for powder coatings
Keywords Martex Paints, Powder coatings, Primers
In regard to powder coatings developments (see above), Martex Paints of Birmingham has developed a water-based primer as an alternative to solvent-based etch primers, chromating or phosphating prior to the application of either a thermosetting or nylon powder coating. It contains no chromates or toxic anti-corrosive pigments, has a very low solvent content (< 20g/litre) and can be thinned with tap water if required.
Martex Paints' managing director Terry Hickling commented:
Following evaluation of Anoprime against commercially available etch primers, our customers have shown that the product achieves a significant improvement in inter-coat adhesion and impact resistance when over-coated with either thermosetting or nylon powder coating material.
Anoprime was developed originally as an alternative to anodising for aluminium decorative finishing (hence the "ano") and can be applied using conventional spray equipment, airless and electrostatic, or by dip-coating. Anoprime contains 30 per cent (± 2 per cent) solids and stoves at 180°C for ten to 15 minutes. The only deviation to this would be if the primer were to be followed by a nylon powder applied by the fluidised bed method, when the primed components would be subjected to a pre-heating process at around 320°C. The product can be applied over ferrous or non-ferrous metals, and the recommended dry film weight is ten to 12 microns.
When subjected to salt spray procedure ASTM B117, the new primer is said to exhibit superior corrosion resistance to that of etch primers, whether the substrate has been pretreated or not. Also, the product's anti-corrosion properties over aluminium are claimed to be "outstanding" and the improvement in adhesion of polyester powder over galvanized metal is "very noticeable". Further details on the company's Website: www.anoprime.com
John Bean