I missed that. My bad.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On Behalf Of
roxanna Mason
Sent: Thursday, July 9, 2020 7:33 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Amateur thermoplastic binder solids
We were talking about two different applications, the PG for a heat transfer
medium for the asphalt double boiler
and the PPG as a fuel/binder.
On Thu, Jul 9, 2020 at 7:44 AM Anthony Cesaroni <anthony@xxxxxxxxxxx
<mailto:anthony@xxxxxxxxxxx> > wrote:
Propylene glycol and polypropylene glycol (PPG) are two different but related
chemicals.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > On Behalf
Of ken mason
Sent: Wednesday, July 8, 2020 7:40 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: Amateur thermoplastic binder solids
Exactly DH, non toxic Propylene Glycol was my thoughts, available at auto parts
stores as antifreeze coolant and in my cars radiators.
Theoretically water under pressure with a calibrated relief valve so the temp
can never exceed a safe temp. Depending on the grade of asphalt no relief valve
just melt/mix at the boiling point of pure water. I tested my asphalt sample at
the BP of water, 219F at my elevation, and it was at a workable viscosity. I
don't have a Haake viscometer like at Edwards but it was about like R-45 at RT
maybe a bit thinner.
K
On Wed, Jul 8, 2020 at 4:32 PM DH Barr <dhbarr@xxxxxxxxx
<mailto:dhbarr@xxxxxxxxx> > wrote:
For the amateur with a double boiler and appropriate ratios of alcohol, water,
and glycol; one should be able to precisely target arbitrary temperatures
across a fairly wide range ( boiling point of pure alcohol through boiling
point of pure glycol ).
On Wednesday, July 8, 2020, Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx
<mailto:troy@xxxxxxxxxxxxxxxxxxxxx> > wrote:
IIRC it's a technique also employed for gelatine processing in capsule
manufacture for drugs. I vaguely recall gelatine has quite a narrow window
of temperature where it will stay liquid - around 60deg C or thereabouts; so
a heating jacket is employed using steam, but due to the lower temperature,
its pressure is reduced to near vacuum to ensure boiling and uniform steam
dispersion throughout the heating jacket.
Speaking of vacuums, you can also utilise a partial or full vacuum to
increase the safety margin of propellant processing utilising elevated
temperatures ie. it's much harder to ignite propellants under vacuum
conditions.
Troy
-----Original Message-----On
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx ;<mailto:arocket-bounce@xxxxxxxxxxxxx> ]
Behalf Of Henry Spencercan
Sent: Thursday, 9 July 2020 7:19 AM
To: Arocket List <arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx> >
Subject: [AR] Re: Amateur thermoplastic binder solids
On Wed, 8 Jul 2020, William Claybaugh wrote:
My sources say AP ignites a little above 400 degrees F so a binder
that forms a low viscosity fluid at around the BP of water will in
theory work fine if there is no possibility of hot spots.
If you can find something that works *at* the boiling point of water, you
use steam heat (with a steam source that heats the water, not thefilling
steam) to ensure it just can't go any hotter.
(This technique is, or was -- my info may be out of date -- widespread for
munitions with TNT, which is a fairly-stable liquid at 100degC.distance
That helpful property is one reason why TNT became so popular.)
If I were going in that direction I would want to automate the mixing
rather than stand over an open pot of hot binder, AP, and Al, stirring.
If one must pre-fix fuel and oxidizer :-), especially hot, doing it from a
makes a whole lot of sense.
Henry