Adhesive to bond High Pressure Laminate to Powdercoat (textured) steel 2

[DaveConsoles]

I'm having a problem with getting the laminate to stay down on painted metal worksurfaces of my control room furniture.

My initial concept was to use DAP Weldwood contact cement, but it is "bubbling up" after being shipped in 150 deg. freight trailer. I then went to 3M brand "Hi-Strength 90" spray adhesive, but it is coming loose in some instances too (even double-spraying both sides...)

My paint vendor says the hybrid, textured powdercoat I use does not form a wax layer, or other contaminant layer when dry, and we are following adhesive applications directions closely. So, I'm not sure why the laminate to paint bond is not holding.

Any suggestions?

 

[unclesyd]

What is the composition of your powder coat?

 

[Rogerio1]

Some powder coatings are really tricky - I've had perfect adhesion going to complete release just by changing the color of the coating (the manufacturers claim the formulations are unchanged).
Try wiping the coated surface with some acetone and letting it dry for a few minutes before applying the adhesive. That's solved the problem a couple of times for me.

Regards,
Giacaglia

 

[DaveConsoles]

Reply to unclesyd

The composition of my paint is Sherwin-Williams Powdura - Hybrid Powder Coating comprised of:

45% Epoxy Polymer
27% Barium Sulfate
9% Titanium Dioxide

The MSDA sheet data is all I have & I am concerned there may be other additives such as waxes etc that may affect proper bonding

 

[unclesyd]

Take a look at this website.

http://www.fluoroseal.com/adhesion.html

 

[TomQuinn]

Dave,

You need to determine if you are having adhesive or cohesive failure. Is there adhesive residue on both substrates after failure at 150F? If so, you are having a heat resistance problem and need a higher Mw or x-linked adhesive. If one of the substrates is clean, you need to improve adhesion with a different adhesive and/or improve the application with better substrate preparation, etc.

A hot melt polyurethane moisture cure adhesive is worth considering.

Regards,
Tom Quinn
Adherent Laboratories

 

[resinated]

try cleaning with isopropyl alcohol and then use Scotchweld DP-100 FR for adhesive