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#1
posted to rec.boats.building
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Chem bond with cured epoxy
Sometimes you have to apply new epoxy to older cured epoxy resulting in
a "secondary" bond held only with mechanical interlocking to surface roughness. Is there any way to de-cure just the surface of epoxy so you can get a chemical bond? |
#2
posted to rec.boats.building
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Chem bond with cured epoxy
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#3
posted to rec.boats.building
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Chem bond with cured epoxy
Does warming the old stuff do any good?
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#4
posted to rec.boats.building
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Chem bond with cured epoxy
"No" is not a satisfactory answer.
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#5
posted to rec.boats.building
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Chem bond with cured epoxy
This past year I have done a little experimenting on this topic for an
application at work. Specifically, we have been experimenting with using various polymer films to smooth optical surfaces. Such films can produce roughness below 3 angstroms due to their surface tension. HOWEVER, after use, we need to be able to remove the films. We have tried polymer films with various solvents such as acrylic lacquers, epoxy based lacquers and even polyimide films. Epoxy is nice because it is fairly hard and is not as easily damaged by heat as the acrylic lacquers. Cured epoxy can be removed by strong methyl chloride solutions, especially when heated so I wonder what TCE (Tri-chloryl ethylene or cleaning fluid) would do. Polyimide is another story. It was devised as a very heat resistent and radiation resistant film. When I asked the manufacturer about removing the cured film he thought I was crazy saying "It isnt EVER supposed to be removed" and so far he is right. It is great stuff but requires about 450 degrees F to cure. It makes a beautiful film with ultra-low roughness that is very adherent to metals. |
#6
posted to rec.boats.building
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Chem bond with cured epoxy
wrote in message
ups.com... "No" is not a satisfactory answer. But what if it is the only answer. I mean, the epoxy is changing chemically, so it is perfectly feasible that, once cured, it will not be chemically active to uncured epoxy. Maybe compare it to "cured steel". Once turned into rust, you cannot weld new steel to it.... :-) Meindert |
#7
posted to rec.boats.building
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Chem bond with cured epoxy
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#8
posted to rec.boats.building
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Chem bond with cured epoxy
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#9
posted to rec.boats.building
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Chem bond with cured epoxy
Meindert Sprang wrote:
wrote in message ups.com... "No" is not a satisfactory answer. But what if it is the only answer. I mean, the epoxy is changing chemically, so it is perfectly feasible that, once cured, it will not be chemically active to uncured epoxy. That's exactly correct. |
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