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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Patrick wrote ...
The problem with solvent, is that PP and PE are pretty much chemical resistant
Dunno about those, but you mentioned Mylar as well ... which is PET, which does seem to have a few solvents ... Diacetone alcohol and MEK for instance.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Patrick wrote ...
2Spoons wrote ...
Usual method of bonding PP or PE involves surface oxidation, using an oxidising flame or sulphuric acid
Ive heard of the flame+chemistry method, never done it though, because once your using a flame, you might as well just thermal weld the PE like a hot glue gun deal.
Its not quite the same as a thermal weld, its meant to be just a quick surface treatment - ie flick a flame a few times across the surface. You're not trying to melt the plastic with this method. It does improve the adhesion of various glues - i've used that trick with one of the solvent based co-polymer adhesive/filler type compounds. Its supposed to work with epoxy too. The plasma treatment is similar to a chemical 'etch' - it creates a stream of ionised, reactive oxygen species that attack the surface. We had one here at work for a while, trying to bond UV acrylic glue to LCP, another 'difficult' plastic. It worked fairly well.
You could try building a plasma generator - using a flyback to get ~10kV or so at 50kHz, then you need a glass tube, electrodes and air feed. Should be a doddle for anyone one this forum!
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
2Spoons wrote ...
Patrick wrote ...
2Spoons wrote ...
Usual method of bonding PP or PE involves surface oxidation, using an oxidising flame or sulphuric acid
Ive heard of the flame+chemistry method, never done it though, because once your using a flame, you might as well just thermal weld the PE like a hot glue gun deal.
Its not quite the same as a thermal weld, its meant to be just a quick surface treatment - ie flick a flame a few times across the surface. You're not trying to melt the plastic with this method. It does improve the adhesion of various glues - i've used that trick with one of the solvent based co-polymer adhesive/filler type compounds. Its supposed to work with epoxy too. The plasma treatment is similar to a chemical 'etch' - it creates a stream of ionised, reactive oxygen species that attack the surface. We had one here at work for a while, trying to bond UV acrylic glue to LCP, another 'difficult' plastic. It worked fairly well.
You could try building a plasma generator - using a flyback to get ~10kV or so at 50kHz, then you need a glass tube, electrodes and air feed. Should be a doddle for anyone one this forum!
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A Simple Experiment: Bonding PE and PP.
