DE2047754C1 - High-speed burning agent with improved pressure exponent - Google Patents

Description

The invention relates to a high burning rate propellant with an improved pressure exponent the basis of nitrocellulose, explosive oils, usual plasticizers and stabilizers, as well as a proportion of metal salts of organic acids and polyacetylene.

Propellants based on nitrocellulose and explosive oils should, if possible, be of the most varied Application conditions with regard to energy content, burning rate, pressure exponent and Correspond to temperature coefficients.

The influence of the pressure as well as the temperature coefficient is through metal salt combinations possible, whereby the lower-calorie powder types are usually various lead salts such as. B. Lead hexoate and lead salicylate act, while with hotter powders a heat of explosion around or above lOOOcal / g combinations of lead and copper salts such as B. lead ß-resorcylate and monobasic copper salicylate used with success (Swiss patent specification 4 79 502). From the German patent specification 11 87 168 polyacetylene-containing blowing agents are known, which contain lead stearate and lead 2-ethylhexoate and lead salicylate as burn rate regulators. Fast burning, According to German Patent 14 46 929, hot pile powders are produced by the combination of Polyacetylene and lead salts produced in certain proportions.

It has now been found that the pressure dependence of a fast-burning pole powder on pressures between 180 to 300 atmospheres and possibly above that can improve decisively if the powder is used as Metal salts contains a mixture of lead and copper salts in combination with polyacetylene, the The weight ratio of these salts to polyacetylene is at least 2: 1.

That the combination of polyacetylene with the salts mentioned for the high burning rate

pressure Powder type - B. - 1.48 kp / cm ² A. 100.00 100.00 Composition in% 48.24 Nitrocellulose (12.7% N) 49.05 1.47% 41.10 1.16% Nitroglycerin 41.77 2.47 Stabilizers (Akardite + Centralite) 2.47 1067 3.70 1063 Dibutyl phthalate 1.70 0.05 Magnesium oxide 0.05 mm / sec 0.05 mm / sec graphite 0.05 0.05 Candelilla wax 0.05 1.38 Lead salicylate 1.88 1.48 Lead hexoate 1.98 Copper salicylate 1.00 Polyacetylene stability (Weight loss after 72 hours at 105 ⁰ C) Heat of explosion, cal / g

Burn rate
Measured at 20 ° C in the Crawford bomb

130 16.2 26.4

160 19.5 28.0

190 22.0 29.3

Types A and B are comparable in their basic composition and explosion heat; their stability is good.

Type A contains lead and copper salts of organic acids, but no polyacetylene; the burning speeds are in the measured range between 130 to 190 kp / cm ² approx. 40% below those of the polyacetylene-containing type B. It can be seen that the combination of lead and copper salts of organic acids with polyacetylene causes the high burning speeds , D and E give examples of the combination according to the invention between polyacetylene and the metal salts mentioned. The powders are distinguished by the fact that they have the same burning rate at 20 ° C. in the pressure range between 160 to approx. 300 kp / cm ^2. The powder F is a comparison powder free of copper salts.

From the drawing, which shows the burning rates of the powder types in the pressure range from approx. 40 to 290 kp / cm ² , the decisive influence of the copper salts on the pressure dependence of the powder can be seen.

According to a further feature of the invention, the weight ratio is preferably 1 > 0.5. Furthermore, the polyacetylene content should be 1 to 2%. Finally, the invention is also characterized in that that the lead and copper salts of organic acids are the neutral or basic salts of these Acids, preferably ethylhexyl, resorcylic and salicylic acid.

Composition in% pressure 20 47 48.24 754 48.24 4th E. 48.24 F. 48.24 - 1.48 3 Nitrocellulose (12.7% N) kp / cm ² 41.10 41.10 41.10 41.10 1.3% Nitroglycerin 40 Powder type 2.47 2.47 2.00 2.47 Stabilizers / Arkadit + Centralit 70 C. 1.70 D. 1.70 0.87 3.70 1000 Dibutyl phthalate 100 0.05 0.05 0.05 0.05 Magnesium oxide 130 0.05 0.05 0.05 0.05 mm / sec graphite 160 0.05 0.05 0.05 0.05 16.0 Candelilla wax 190 1.38 1.88 1.38 1.38 22.0 Lead salicylate 210 1.48 1.98 1.48 1.48 25.3 Lead ethyl hexoate 250 2.00 1.00 2.50 27.7 Copper salicylate 270 1.48 1.48 1.48 29.0 Polyacetylene 290 1.99% 1.73% 1.59% 30.3 30.8 1009 1020 1060 32.7 33.5 mm / sec mm / sec mm / sec 34.3 18.8 21.3 20.1 23.3 25.7 24.5 26.7 28.2 27.5 28.8 30.3 29.7 30.0 31.7 31.6 30.3 31.9 32.5 30.3 32.1 33.0 30.4 32.1 33.0 31.0 32.3 33.0 31.5 34.0 33.3 Stability (weight loss after 72 hours Storage at 105 ⁰ C) Heat of explosion, cal / g Burning rate at 20 ^° C measured in the Crawford bomb

For the production of the powders according to the invention 40 friction rollers, screw presses or similar inten-

it is important to use machines that work with siv. It is also necessary

maximum homogenization of the powder masses, best processing temperatures between 90-100 °

Ensure the incorporation of the additives, such as B. hold.

1 sheet of drawings

Claims (4)

Patent claims: 1. High burning rate propellant with improved pressure exponent based on Nitrocellulose and explosive oils, usual plasticizers and stabilizers, as well as a proportion of Metal salts of organic acids and polyacetylene, characterized in that it is as Metal salts contains a mixture of lead and copper salts in combination with polyacetylene, the The weight ratio of these salts to polyacetylene is at least 2: 1. 2. Propellant according to claim 1, characterized in that the weight ratio is lead salts to copper salts is preferably 1 ^ 0.5. 3. Propellant according to claim 1 and 2, characterized in that the content of polyacetylene 1 up to 2%. 4. propellant according to claims 1 to 3, characterized in that it is as lead and Copper salts of organic acids the neutral or basic salts of these acids, preferably the Contains ethylhexyl, resorcylic and salicylic acid. 25 of the powder is decisive, is shown below for two powder types A and B.