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Adhesion Promotion with a Dynasylan®
Primer |
A primer of Dynasylan® HYDROSIL 2909 improved the adhesion of an aqueous acrylic coating to aluminum. Details of the formulations and tests are given below.
Adhesion after water storage
The sample on the left was not primed.
The sample on the right was primed with Dynasylan® HYDROSIL 2909.
UV stability
The sample on the left was not primed.
The sample on the right was primed with Dynasylan® HYDROSIL 2909.
Primering
Half of the aluminum pieces were not pre-treated. The other half were treated with a primer made from
- 2 g Dynasylan® HYDROSIL 2909
- 350 g methoxypropanol.
The primer solution was applied as a single coat (10 µm wet) then dried at room tempertaure for 10 minutes before thermally curing at 150°C for 30 minutes.
Coating
All test pieces were single-coated (100 µm wet) with an aqueous acrylate dispersion:
- 100 g acrylate copolymer
- 3 g propylene glycol
- 5.2 g helizarin green
- 17 g water and organic solvents
After coating, the samples were dried 10 minutes at room temperature and then cured for 30 minutes at 150° C.
The cured pieces were then cut and then tested.
Test information
- Water storage: 24 hours at 23°C
- UV stability: 1000 hours in cycles of 102 minutes dry followed by 18 minutes wet (DIN EN 4892-3)
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