Clear powder coatings

Future Development Trends of the powder coating 1 Powder Coating in the automotive industry The automotive industry is a pillar industry in China, investment in the next five years is equivalent to nine times in the Eighth Five-Year Plan “period, the social ownership of our cars in 2005 will reach 20.6 million. At present, the powder coating used for the coating of automotive engine, chassis, wheels, filters, joystick, mirrors, wiper and horn and other parts in the automotive industry. Abroad, transparent powderRead More …

A team of Iranian researchers have recently come up with a new method to increase the scratch resistance of automotive clear coats. During the recent decades, there has been a great deal of efforts to improve the resistance of automotive clear coats against the abrasive and erosive wear. As a result, a number of techniques have been proposed for this purpose. A recent example of the latter involves the use of silicon-based additives to give better the anti-scratching quality toRead More …

Color variety is almost limitless these days, with many coatings suppliers offering a pallet of off-the-shelf colors, as well as custom color-match services to better meet the needs of small-volume powder users. There are also tints that can add highlight color to a substrate or base coat, such as a brass look over polished aluminum. A range from flat to high gloss is generally available. Smooth, high-gloss coatings can offer high distinctiveness of image, creating an illusion of depth orRead More …

The new zero-VOC water-based epoxy topcoat has excellent resistance to a wide variety of industrial and household chemicals. Results of chemical resistance spot tests run in accordance with ASTM D 1308 (Table 1) shows the zero-VOC epoxy topcoat resists acids, bases, industrial solvents such as ketones, alcohols, glycol ethers, and aliphatic and aromatic hydrocarbons and various other chemicals such as bleach, motor oil and brake fluid. Reagent Concrete 10% Hydrochloric acid Good 10% Nitric acid Good 10% Phosphoric acid GoodRead More …

Since 1982, when the first bisphenol A-based solid epoxy dispersion and modified amine system came to market as an adduct suitable for metal protection, water-based epoxy systems have been used for high-performance industrial primers and topcoats over metal due to their fast dry time, corrosion resistance, good pot life and low odor. Although water-based epoxy has successfully replaced traditional solvent-based epoxy/polyamide coatings in many high-performance industrial applications, the VOC content of these water-based epoxies is typically 200-350 g/L. So now,Read More …

Powder coatings today The dominant overall finishing trend will continue to be replacement of liquid finishing with powder coating for environmental impact reasons. Improvements in both coating and application technology will promote much broader powder use. The technology improvements are driven by needs primarily in the automotive, appliance and general industrial markets. The improvements encompass raw material, coating manufacturing and application sophistication changes. The automotive industry continues to expand powder coating from under-hood, trim and wheels to body applications. ImprovementsRead More …

Salt Spray Test – Corrosion test using salt (NaCl) sprayed as a mist in a heated humidity chamber to simulate seashore conditions, or to accelerate corrosion at a controlled rate. ASTM B117. Sandblast – Blast cleaning using sand as an abrasive. Scale – Rust occurring in thin layers–commonly found on hot rolled steel. Sealed Coating – Primer. Coating used for the prevention of excessive absorption of a first coat of paint by the substrate. Seeding – Formation of small agglomeratesRead More …

When environmental fallout became an issue, clear topcoat technologies were developed to successfully solve the problem. Currently, mar and scratch damage as observed in the field is a problem receiving considerable attention. Car washes can be very abrasive. This wet abrasion action results in an undesirable visual dulling and a striped effect on nearly all current clearcoat technologies. PPG uses nanoscratch testing instrumentation as a means to determine the energetics required to cause the various types of damage to clearcoats. InRead More …

Curable or thermosetting powder coating compositions are widely used, particularly for topcoats in automotive and other industrial coatings. Basecoat/clearcoat composite coatings are topcoats that offer exceptional gloss, depth of color, distinctness of image or special metallic effects. The automotive industry has made extensive use of basecoat/clearcoat composite coatings for automotive body panels. Single-layer topcoats and clearcoats usually require an extremely high degree of clarity and gloss to achieve the desired visual effect. Furthermore, they must maintain their clarity and gloss overRead More …

The most important element for recoating the powder coating and as a matter of fact, for applying a different topcoating over an applied coating is to be sure the new coating will not lift or wrinkle the old coating. Check the old applied coating with a strong lacquer thinner by wetting the surface and giving it a couple of rubs with a damp cloth. If there is no excessive softening the coating should be OK to recoat with a newRead More …