oldguy Posted April 25, 2011 Posted April 25, 2011 Low smoke star comps As an example: A star composition formulated by processing a damp mixture of 55.5 grams wet nitrocellulose (containing 30 weight percent water), 18 grams nitroguanidine, 18 grams ammonium perchlorate, 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol and 8 grams metal salt colorant in a high speed cutter-mixer. The metal salts typically used to produce red, orange, green, orange-yellow and blue flame colors were respectively strontium carbonate, calcium carbonate, barium carbonate and basic copper carbonate. The color purple is produced from a mixture of strontium carbonate and basic copper carbonate salts; and yellow color is produced from a mixture of barium carbonate and calcium carbonate salts. The composition was then pressed into cylindrical pellets with a dimension of 0.25 inches tall and 0.25 inches diameter and air-dried to form strong, easily ignitable stars. My question is, where can nitroguanidine be had, if at all possible?
dagabu Posted April 25, 2011 Posted April 25, 2011 Guanidine Nitrate can be had from Underground Gadgets, send Cracker an email, undergroundgadgets@comcast.net. -dag
oldguy Posted April 25, 2011 Author Posted April 25, 2011 Guanidine Nitrate can be had from Underground Gadgets, send Cracker an email, undergroundgadgets@comcast.net. -dag Many thanks Sir......
Mumbles Posted April 25, 2011 Posted April 25, 2011 That is very interesting stuff. May I ask where you found it? Anyway, guanidine nitrate is not the same as nitroguanidine. It's possible to convert one into the other though.
dagabu Posted April 25, 2011 Posted April 25, 2011 I'm sorry, I thought that it was the same stuff, never mind...
oldguy Posted April 26, 2011 Author Posted April 26, 2011 That is very interesting stuff. May I ask where you found it?Anyway, guanidine nitrate is not the same as nitroguanidine. It's possible to convert one into the other though. U.S. Patent 6599379 Issued July 29, 2003 Low-smoke nitroguanidine and nitrocellulose based pyrotechnic compositions Example 1 A star composition was formulated by processing a damp mixture of 55.5 grams wet nitrocellulose (containing 30 weight percent water), 18 grams nitroguanidine, 18 grams ammonium perchlorate, 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol and 8 grams metal salt colorant in a high speed cutter-mixer. The metal salts typically used to produce red, orange, green, orange-yellow and blue flame colors were respectively strontium carbonate, calcium carbonate, barium carbonate and basic copper carbonate. The color purple is produced from a mixture of strontium carbonate and basic copper carbonate salts; and yellow color is produced from a mixture of barium carbonate and calcium carbonate salts. The composition was then pressed into right-cylindrical pellets with a dimension of 0.25 inches tall and 0.25 inches diameter and air-dried to form strong, easily ignitable stars. Example 2 A red flare composition was formulated by processing a damp mixture of 58 grams wet nitrocellulose (containing 30 weight percent water), 7.8 grams nitroguanidine, 21.4 grams ammonium perchlorate, 7.8 grams strontium carbonate, 3.9 grams titanium metal powder and 8 grams of 20 weight percent aqueous solution of polyvinyl alcohol in a high speed cutter-mixer. The pyrotechnic mixture is pressed into cardboard tubes and air-dried. Using the same procedure, a blue flare composition was formulated with 28 grams wet nitrocellulose (containing 30 weight percent water), 38.6 grams nitroguanidine, 21.1 grams ammonium perchlorate, 7.7 grams basic copper carbonate, 3.9 grams titanium metal powder and 8 grams of 20 weight percent aqueous solution of polyvinyl alcohol. Example 3 The following compositions are suitable for gerb devices that burn slowly. For an orange gerb formulation, a damp mixture of 29 grams wet nitrocellulose (containing 30 weight percent water), 48 grams nitroguanidine, 12.5 grams ammonium perchlorate, 4.1 grams calcium carbonate, 6 grams titanium metal powder and 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol was processed in a high speed cutter-mixer. A blue gerb formulation consisted of 18 grams wet nitrocellulose (containing 30 weight percent water), 54.5 grams nitroguanidine, 12 grams ammonium perchlorate, 8.1 grams basic copper carbonate, 6 grams titanium metal powder and 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol. Example 4 The following compositions are suitable for gerb devices that burn faster than those compositions described in Example 3. For a purple gerb formulation, a damp mixture of 48 grams wet nitrocellulose (containing 30 weight percent water), 25 grams nitroguanidine, 12.5 grams ammonnium perchlorate, 3.3 gram basic copper carbonate, 5 grams strontium carbonate, 6.5 grams titanium metal powder and 6 grams of 20 weight percent aqueous solution of polyvinyl alcohol was processed in a high speed cutter-mixer. A green formulation consisted of 45.5 grams wet nitrocellulose (containing 30 weight percent water), 24 grams nitroguanidine, 16 grams ammonium perchlorate, 8 grams barium carbonate, 6 grams titanium metal powder and 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol. Example 5 A silver-colored gerb device that burns at relatively slow rate and contains only potassium perchlorate as the oxidant was formulated by processing a damp mixture of 31 grams wet nitrocellulose (containing 30 weight percent water), 50 grams nitroguanidine, 8.9 grams potassium perchlorate, 5.5 grams titanium metal powder and 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol in a high speed cutter-mixer. Example 6 A yellow colored gerb device that burns at relatively slow rate and contains a mixture of ammonium perchlorate and potassium perchlorate as the oxidant was formulated by processing a damp mixture of 31 grams wet nitrocellulose (containing 30 weight percent water), 42.5 grams nitroguanidine, 6.3 grams potassium perchlorate, 3.9 grams ammonium perchlorate, 5.8 grams barium carbonate, 0.4 grams calcium carbonate, 5.5 grams titanium metal powder and 5 grams of 20 weight percent aqueous solution of polyvinyl alcohol in a high speed cutter-mixer.
MadMax Posted April 26, 2011 Posted April 26, 2011 That is a cool idea. I have thought about using a mostly NC star that would burn cleaner but it hadn't occurred to me to add nitroguanidine. I believe that indoor fireworks use something like this as I recall. Is the nitroguanidine really necessary? What does it do for the comp? I know that I've heard it was used in smokeless powder to slow down the burn rate.
oldguy Posted April 26, 2011 Author Posted April 26, 2011 That is a cool idea. I have thought about using a mostly NC star that would burn cleaner but it hadn't occurred to me to add nitroguanidine. I believe that indoor fireworks use something like this as I recall. Is the nitroguanidine really necessary? What does it do for the comp? I know that I've heard it was used in smokeless powder to slow down the burn rate. From what I gather nitroguanidine has a very high gas output, a low flame temperature & burns off without ash, slag, or other residue. .
oldguy Posted April 26, 2011 Author Posted April 26, 2011 Other LOW SMOKE COMPS LOW-SMOKE PYROTECHNIC COMPOSITION FOR PRODUCING COLORED FLAMES. Publication number: US 2010/0024932 A1. Filing date: Oct 9, 2009 Google “ US 2010/0024932 A1” to read it in PDF form
Mumbles Posted April 26, 2011 Posted April 26, 2011 The primarily NC based stars usually require some exotic, high energy, colorants to get suitable results as you may notice from the examples. They make tons of claims to cover themselves, but in practice most traditional colorants do not work. The tetrazole salts are known to be explosives for what it's worth. There is a whole thread on Science Madness about them. They happen to make excellent whistle catalysts too.
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