DE2012581C - Sprengol-containing solid propellant of the forehead burner type with a superficial solid coating that burns in the hibernation - Google Patents

Description

The invention relates to a blasting oil containing solid propellant of the front burner type with a superficial, burn-inhibiting solid coating and with a reduced tendency to smoke, in which there is a layer of two-base between the propellant shaped body and the inhibitor coating Propellant powder with a content of inorganic nitrate, especially alkali or alkaline earth nitrate, is provided is.

In the case of a known propellant of this type, the content of the dibasic propellant powder is inorganic Nitrate measured at about 20%, while the layer consisting of this powder is a starch to increase the thickness of the inhibitor layer about 15 to 35%.

Surprisingly, it has now been found that with incorporation of at least 40%, for. B. 50%, an inorganic nitrate in the dibasic powder the strength of this smoke-reducing intermediate layer can keep much less than that of the inhibitor layer and that the smoke formation still is further reduced. You need an intermediate layer whose thickness is only 50% or less Thickness of the inhibitor layer. The manufacture of these containing around 50% inorganic nitrates According to the known production method, two-base powder is without difficulties on rolling mills possible.

The subject matter of the invention is therefore the measure that in a propellant charge as explained at the beginning the inorganic nitrate content in the intermediate layer is measured at at least 40% and is equal to ■ early their thickness is less than that of the inhibitor coating is held.

In one embodiment of the inventive K; -. Propellant charge is provided that the content of am: ganic nitrate is about 50%. Furthermore kalman the thickness of the nitrate-containing intermediate layer rr. ίο less than 50% of the strength of the Inhibitorschic; ': measured.

Appropriately, foils of a thickness zv. see 0.4 and 0.6 mm made in strips ρ: cut in the known winding process the use of solvents on the propellant bodies; -, be applied. On the face of propellant:; '- sentences can, if necessary, also by Al; glue foils are applied. After application · .- .; the intermediate layer according to the invention are d>. Propellants in a manner known per se? inhibited.

The following examples show how smoke can be minimized using the example of a forehead burner «.

example

The forehead burners were made from a hot puIw, of 100 ocal / g of explosion heat of the following composition manufactured.

Nitrocellulose with 12.8% nitrogen .. 48.3%

Nitroglycerin 41%

Ballistic additives 3%

Plasticizer 5.2%

Stabilizers 2.5%

The dimensions of the insulated head burner were: 50 mm in diameter and 120 mm in length. The propellants were with a polyester inhibition ;; provided, the thickness of which was 2 mm.

To reduce smoke, a mixture of two powders with the following composition was made into films made of 0.5 mm thickness.

Nitrocellulose

with 12.8 «/ 0 nitrogen ...

Nitroglycerin

Dibutyl phthalate

Satbilizers

Centralit I

Akardite II

Magnesium oxide

graphite

Barium nitrate

Type a

37.00% 31.50% 12.70%

2.85% 0.85%

0.05%

0.05 »/ β

15.00%

Type B

21.50%

18.50%

7.74%

1.70% 0.50%

0.03%

0.03%

50.00%

100.00% I 100.00%

60 Analysis of the powder resulted in: Type B. 0
865 , 2 Humidity, %
Explosion heat, 65 cal / g. Type a 0.1
804

A layer of the foils was wound onto the propellant charges with about a third overlap

using a mixed solvent of butyl acetate and lactonal, so that the strength of the nitrate-containing film was 0.5 mm on two thirds of the area and 1 mm on one third of the area.

For comparison, forehead burners were made without nitrates Interlayer checked.

To measure smoke, the extinction was measured over the burning time using a photocell. Of the three types of forehead burners were burned and evaluated for ten bodies each. The result of the flue gas measurement fraud

Ed /

Without

nitrate-containing intermediate layer

2.47

With 15 »/ o

nitrate-containing

Intermediate layer

1.18

With 50 ° / o

nitrate-containing

Intermediate layer

0.20

Claims (5)

Patent claims: 1. Solid propellant of the forehead burner type containing explosive oil with a superficial, which Combustion-inhibiting solid coating and with a reduced tendency to smoke, in which a layer of two-base propellant powder between the propellant shaped body and the inhibitor coating with a content of inorganic nitrate, especially alkali or alkaline earth nitrate, provided is characterized by that the content of inorganic nitrate in the intermediate layer is at least 40 ", -Ό and at the same time their strength is kept lower than that of the inhibitor coating. 2. propellant charge according to claim 1, characterized in that the content of inorganic nitrate is about 50 ¹ Vo. 3. propellant charge according to claims 1 and 2, characterized in that the thickness of the nitrate Interlayer under 50 "Ό dor thickness the inhibitor layer lies. 4. propellant charge according to claims 1 to 3, characterized in that the intermediate layer by winding or gluing on powder foils using solvents the propellant is brought. 5. propellant charge according to claims 1 to 4, dadurcii characterized in that the thickness of the powder foils is 0.4 to 0.6 mm, preferably 0.5 mm.