I didn't get the required green strenght yet. Indeed, the highest value
I got was only 6gf/25mm and I need at least 50 gf/25mm. I produced a 2K
solventless PU adhesive with 9% of free NCO (40000 cps). So, this
polymer has high molecular weight and to be applied should be heated
(60 degrees Celsius). I can produce a polymer with low NCO, i mean 3 to
5% and use propylene carbonate as diluent but I"m not sure if I'll
reach the target: 50gf/25mm.
I know this an innovation, this kind of adhesive don't exist yet but
I'm trying to find out how increase the green strenght when working
with solventless systems.
I'm now trying to develop a catalyst based on DBTL, Voranol and
Triethanolamine and react this catalyst with a polymer of high
molecular weight. I agree that mobility in solventless system is a big
problem. To improve adhesion on metallised films or alufoil I'll try to
In this issue, at least for a while, don't mind the pot life or
temperature. I just wanna get 50gf/25mm.
what do you suggest ?