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Author: Subject: potential new binder ?
dave321
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[*] posted on 22-8-2013 at 10:43
potential new binder ?


this looks interesting, sugru, a moldable silicone that cures to form a flexible whatever.....
...hmmm
wonder how much solids you could get in it

see bottom of page for msds....it contains talc and barium sulphate as fillers

http://sugru.com/about

sugru is a formulation of Formerol - the patented formable silicone technology invented by Jane. It's Formerol F.10, to be precise. We call it sugru, because that's its superhero name.
sugru has a Shore A hardness of 70, Density of 1.3g/cm3, Tensile Strength of 1.89 Mpa, Youngs Modulus of 5.59MPa, an Strain to Failure of 211%, DIN Abrasion Resistance of 24% ARI index (Standard used ISO4649 Method A), Electrical Resistivity - Surface 1.40 x 10^14 Ohms (Standard used BS903), Electrical Resistivity - Volume 2.55 x 10^14 Ohms (Standard used BS903), and a Williams Plasticity of 160mm.



[Edited on 22-8-2013 by dave321]
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Dany
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[*] posted on 22-8-2013 at 11:13


Yes, interresting new binder, but why it is in the energetic material section?

if you are offering this binder as a binder in energetic material formulation, i think this is not a good idea. Today research try to find new energetic binder and plasticizers so to enhance detonation properties. Inert binders are almost from the past...

Dany.
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dave321
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[*] posted on 23-8-2013 at 02:11



could be used as a pbx ?

or maybe rather Sibx :)

that's why its in this section, not all binders have to be energetic or reactive
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Dany
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[*] posted on 23-8-2013 at 02:29


As a PBX??

but PBX are rigid solid materials. Most PBX formulation contain 10% binder or less. Your are proposing a binder that become flexible when cured. not all binder are suitable for explosive PBX formulations. The binder should have excellent mechanical properties and should not crack under severe loading or with temperature change. Once cracks are introduce, the PBX formulation become sensitive due to the formation of potential site for hot spot formation. A PBX binder should allow the users to easily press the charge to 99% TMD (Theoretical Maximum Density) so as to reach the maximum detonation performance. Silicon based polymer were introduced in rubberized explosive formulation like Detasheet (Du pont de Nemour) or XTX-8003 and XTX-8004.

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[*] posted on 23-8-2013 at 06:26


There has been some use of GE silicone II for binder/fuel in pyrotechnics.

Blue strobe rocket fuel/binder, self propelled stars- Some mixes are listed on page 15 here:

http://www.westernpyro.org/files/newsletters/Volume%2022-1.p...

Clear (no inert fillers) product was used.

Be aware: For high thrust rocket applications a too flexible fuel grain that can slump under high G's, pulling away from bonding to motor case walls can increase the area of fuel burning and lead to a CATO.




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AndersHoveland
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[*] posted on 16-9-2013 at 09:21


The addition of a small amount of boric acid can be used to crosslink wetted corn starch, pectin, or guar gum, greatly increasing gelatinization. This could potentially be used as a plasticizer. If propylene glycol (common food additive) is used as the wetting agent, it is less likely to dry out.

These mixes have are somewhat similar in consistency to silly putty.

In fact, if the starch was partially nitrated, that would probably help overall performance so the binder would not be entirely inert. Partial nitration would also be likely to improve the physical handling characteristics (think nitrocellulose lacquer paste).

[Edited on 16-9-2013 by AndersHoveland]
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