jelly-wax candles, gelled mineral oil, optics
j.e.mcmillan
shops etc. They're made of a transparent gelatinous material which
can be dyed and scented etc. Very nice.
My own interest is in using mineral oil as a lightguide. It works
fine but is difficult to work with - since it always seems to end
up all over other equipment. So can it be jellied - like the jelly
wax candles?
I had a surf on the web and came up with a recipe.
http://www.formulas4u.com/
"95% mineral oil and 5% cp9000 thermoplastic resin powder" from
Delta Chemical company.
This sounds great - but the company are in Tennnesee.
Does anyone know a UK, or other European supplier of the resin?
It occurs to me that the resin can't be anything exotic.
First, it costs about $8 per kilo. (Which is my other reason for
looking for a local supplier - since it will probably cost me $92 per kilo
to ship it!)
Second, it can't be anything too toxic - since its intended to
be burnt in domestic homes in the USA. So no Chlorine or Sulphur or
Nitrogen atoms.
One suggestion is Polyethylene oxide - which seems to be good at
gelling solvents - a quick look in Chemical supplier catalogues revealed
that this was quite expensive - and available with specified molecular
weight. Probably an over-specification for this job.
Does anyone actually know what this resin powder is?
Has anyone ever used gelled mineral oil as a lightguide or optical
coupling compound?
Regards
John McMillan
Uncle Al
Gelling a non-polar organic is trivial - add 2% fumed silica and mix
violently or sonicate. If you want it to be transparent you have real
problems with light scattering for any gelation system.
Intensely efficient organic gel-forming agents are known, JACS 119
12675 (1997).
--
Uncle Al Schwartz
http://uncleal.within.net/
http://www.mazepath.com/uncleal/
http://www.ultra.net.au/~wisby/uncleal/
http://www.guyy.demon.co.uk/uncleal/
(Toxic URLs! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
John Spevacek
Easy!. Try some styrenic block copolymer, which is sold under many
tradenames. Kraton (Shell), Quintac (Nippon Zeon)and Europrene (Enichem)
are the biggest players. It would run you $1 - 2/lb. depending on the
exact grade, but yoy may not need much. And gel-induced light scattering
shouldn't be a problem since the physical crosslinking sites are less
than 1 micron in diameter. (Look at a piece of box-sealing tape. Most of
the defects are in the polypropylene backing, not the adhesive).
John
--
"A conclusion is the point at which you stopped thinking."
Opinions expressed herein are my own and may not represent those of my employer.
Gareth Davies
the Kraton grades from Shell! The current supplier is Univar plc and they
may be able to help you! Unfortunately the grades that my company have to
offer do not seem to be featured in this technology!
Tel: 0181 253 8800 This is from memory! so I apologise if it rings out!
Regards
Gareth
Hans-Willi Raedt
>
> I've been looking at jelly-wax candles that can be bought in craft
> shops etc. They're made of a transparent gelatinous material which
> can be dyed and scented etc. Very nice.
> My own interest is in using mineral oil as a lightguide. It works
> fine but is difficult to work with - since it always seems to end
> up all over other equipment. So can it be jellied - like the jelly
> wax candles?
Careful with those: The molten stuff is very hot and burns skin more
easily than wax.
regards
hans-willi raedt
Simon Moore
Gareth Davies wrote in message
<927619598.12531.0...@news.demon.co.uk>...
Kraton is correct. The grades best suited to this application are Kraton
G1650, G1651
and G1652, however, they are not easy to dissolve into oil. They typically
require a
blending temperature of around 120°C, and if you can get hold of a high
speed mixer
("Silverson" type) it will make life a lot easier. The G1652 is the lowest
molecular weight
grade, and probably the best one to use for this application. Remember that
the melting points of these oil/polymer blends is a lot higher than that of
normal candle wax
so burned fingers are always a risk!
Guido Thürnagel
Hi Hans-Willi,
> Careful with those: The molten stuff is very hot and burns skin more
> easily than wax
I dont´t think the question was : how to make Napalm?
Cheers, Guido
Dan Bollinger
Gels are also called "high yield." They can support their own weight, will yeild when a force is applied, and then retain the new shape. Modeling clays fit into this, as does the polymer-clays like FIMO and SCULPEY. So is SILLY PUTTY. The thermoplastic mentioned in the formula might be PVC, plastisols are made by mixing a plasticizer with PVC, sometimes heavy mineral spirits are added to lower viscosity.
--
Dan Bollinger
Wabash Men's Council
http://www.themenscenter.com/wabashmen
j.e.mcmillan <j.e.mc...@sheffield.ac.uk> wrote in article <j.e.mcmillan-2...@mac007053.shef.ac.uk>...
> I've been looking at jelly-wax candles that can be bought in craft
> shops etc. They're made of a transparent gelatinous material which
> can be dyed and scented etc. Very nice.
> My own interest is in using mineral oil as a lightguide. It works
> fine but is difficult to work with - since it always seems to end
> up all over other equipment. So can it be jellied - like the jelly
> wax candles?
>
> I had a surf on the web and came up with a recipe.
>
> "95% mineral oil and 5% cp9000 thermoplastic resin powder" from
> Delta Chemical company.
> This sounds great - but the company are in Tennnesee.
> Does anyone know a UK, or other European supplier of the resin?
>
> It occurs to me that the resin can't be anything exotic.
> First, it costs about $8 per kilo. (Which is my other reason for
> looking for a local supplier - since it will probably cost me $92 per kilo
> to ship it!)
> Second, it can't be anything too toxic - since its intended to
> be burnt in domestic homes in the USA. So no Chlorine or Sulphur or
> Nitrogen atoms.
> One suggestion is Polyethylene oxide - which seems to be good at
> gelling solvents - a quick look in Chemical supplier catalogues revealed
> that this was quite expensive - and available with specified molecular
> weight. Probably an over-specification for this job.
>
> Does anyone actually know what this resin powder is?
> Has anyone ever used gelled mineral oil as a lightguide or optical
> coupling compound?
>
> Regards
> John McMillan
>
Noe RS
wrote in message
>> > Has anyone ever used gelled mineral oil as a lightguide
or optical
>> > coupling compound?
>>
silica and mix
>> violently or sonicate. If you want it to be transparent
you have real
>> problems with light scattering for any gelation system.
>>
¿ what is lightguide use ? i was testing to gel oils using
bentonite (Bentone from Rheox) and ethanol, it gelled well
in a non transparent form.
Noe
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