Powder coated surfaces with stable metal shine via microwave energy

During a new study, aluminum flakes were bonded with hybrid, polyester, and PVDF base coating particles by the microwave bonding method.

Steel cubes as a symbolic image.
Metallic corrosion Image source: PIRO4D - Pixabay (symbol image).

Metallic pigmented powder coating, composed of metallic pigments and coating particles, provides coatings with metal shine and functional protection, while causing much less emission of organic solvents, unlike the traditional paint. The greatest challenge of the manufacturing step is binding the two incompatible ingredients together. However, the present industrial binding method, thermal bonding, has some inherent issues, such as pre-curing, pigment bending and high-temperature bonding.

More stable metal shine

Hence, in the present work, a novel approach, microwave bonding, was studied and tested. Aluminum flakes were bonded with three types of powder coatings: polyester, hybrid, and polyvinylidene fluoride (PVDF). Microwave bonding showd a more stable metal shine over the non-bonding, obtains a lower bonding temperature than the glass transition temperature, and has a much higher heating rate (ca. 17 °C/min) over the thermal bonding method. Therefore, microwave bonding is trusted to have great potential to produce coatings with highly stable metal shine efficiently.

The study has been published in Progress in Organic Coatings, Volume 154, May 2021.

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