AEROSIL® and AEROXIDE® fumed metal oxides for powder coatings
The global market for powder coatings is expected to grow at rates higher than liquid coatings due to the ongoing shift from conventional solvent-borne to more environmentally- friendly coating systems. AEROSIL® fumed silica and AEROXIDE® fumed oxides are well known for enhancing and optimizing manufacturing, quality, appearance and overall performance of powder coatings.
AEROSIL® fumed silica improves free flow characteristics:
Right: Powder coating without AEROSIL® fumed silica, Left: Powder coating with AEROSIL® R 972
While AEROXIDE® Alu C, AEROSIL® 200, AEROSIL® R 812 are well known for their excellent suitability in enhancing the desired properties of powder coatings, studies have shown that recent developments such as AEROXIDE® Alu C 805 and AEROXIDE® Alu 130 offer additional benefits in the tested systems. Consistent improvement was demonstrated in powder coatings treated with hydrophobic aluminium oxide AEROXIDE® Alu C 805, and it proved to be a very efficient additive to improve the flow behavior in fine and coarse powder coatings as well. Focusing on the tribo application, the transfer efficiency of AEROXIDE® Alu C 805 was superior in both fine and coarse powders while the Faraday Cage Effect was overcome especially in coarse materials. Due to its hydrophobic character AEROXIDE® Alu C 805 reduces moisture pick-up and enhances storage stability. For the specific system used for this study it can be concluded that AEROXIDE® Alu C 805 and AEROSIL® R 812 showed the best overall results and can therefore be considered the most suitable additives for both, coarse and fine particle size powders.