golfpro
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Plasticizer/Binder
I had some of this: http://www.wftaylor.com/pdf/msds/720-1%20msds%2012-21-10.pdf
It's a kind of viscous liquid with a sticky, rubbery texture. I plasticized roughly 4 grams of ETN in an approx. 9:1 ratio, after mixing/kneading it
very well for consistency, I took little bits at a time for hammer tests, it looked like it all detonated every time. It makes a soft clay w/ fine ETN
powder, very workable and hammer sensitive.
It says synthetic rubber, resin w/ solvents, I've never heard of it as a plasticizer/binder but it looks very good, could there be any drawbacks I am
not aware of?
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Dany
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golfpro,
The biggest problem when mixing explosive or HEDM with a new, untested binders, plasticizers or adhesive is the chemical compatibility. Some chemical
are not compatible with each other so the can react with time or one of the ingredient may induce decomposition in the other component. For a brief
section on compatibility check section 5.3 of LLNL Explosives Handbook-Properties of Chemical Explosives and explosive simulants (rev.2-1985), B.
Dobratz. Remember not every time you added binder you decrease sensitivity. Many published work mention that increase in sensitivity is observed with
some PBX type explosive. The reason of increased sensitivity is the presence of cracks, minute bubble gas (trapped bubble gas or from explosive
decomposition) induced with aging or thermal cycling. these voids can act as a potential sites for hot spot formation and thus render the explosive
more easy to ignite and this by decreasing the critical pressure of initiation needed for initiation. Also, because you don't have special equipment
for pressing your new explosive composition to high density, detonation performance will suffer. So be careful for these aspect with your new
explosive composition.
Dany.
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golfpro
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What do you mean pressing a bonded/plasticized material??
Are there any incompatibilities that you see here?
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Ral123
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Quote: Originally posted by Dany  | golfpro,
The biggest problem when mixing explosive or HEDM with a new, untested binders, plasticizers or adhesive is the chemical compatibility. Some chemical
are not compatible with each other so the can react with time or one of the ingredient may induce decomposition in the other component. For a brief
section on compatibility check section 5.3 of LLNL Explosives Handbook-Properties of Chemical Explosives and explosive simulants (rev.2-1985), B.
Dobratz. Remember not every time you added binder you decrease sensitivity. Many published work mention that increase in sensitivity is observed with
some PBX type explosive. The reason of increased sensitivity is the presence of cracks, minute bubble gas (trapped bubble gas or from explosive
decomposition) induced with aging or thermal cycling. these voids can act as a potential sites for hot spot formation and thus render the explosive
more easy to ignite and this by decreasing the critical pressure of initiation needed for initiation. Also, because you don't have special equipment
for pressing your new explosive composition to high density, detonation performance will suffer. So be careful for these aspect with your new
explosive composition.
Dany. |
I didn't know the sensitising voids are such a thing. Thanks Dany.
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golfpro
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I guess the only way to tell is to test right? I have a 1gram chunk of this gum like material, I'll wait 5 days and do different hammer tests and
whatnot, I really don't believe there will be any problems.
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Microtek
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It's made for glueing carpets to floors, right? And it is a solvent diluted glue, so once the solvent dries out (which it will; it is hexane and
"light distillates" which means similar alkanes) you will be left with something that is more like a PBX than a plastique. Before reaching this point,
you will get an inhomogenous compound as the surface dries out first.
You could try dissolving the carpet cement in a suitable solvent (more hexane or detergent gasoline) and adding some suitable plasticizer such as a
relatively long chain ester, or maybe just motor oil. At any rate something that won't evaporate as readily (at least if you wan't to be able to
store your new plastique).
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