JPS58208192A - Manufacture of syrup-like explosive composition and cartridge - Google Patents

Abstract

1. Continuous process for the production of sirupeous compositions which can be put in cartridges, characterised in that an oxidising solution, which is prepared hot, of usual composition and containing inorganic or organic salts dissolved in water, is mixed with a reducing premix consisting of solid fuels based on metal fuels and of a hardener introduced in solid form of the carboxymethylcellulose type, prior to the final solidification of the composition, the mixture then being put in cartridges using a cutting machine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to provide sufficient hardness and 48 properties for filling paper cases with a cutting machine type cartridge machine.
This invention relates to an improved continuous filling method for syrup-like medicinal gauze having the property of rapid assimilation without sticking.

Syrup explosives (also called "slurry explosives 1")
It hit the market a few years ago. In these explosives, the detonation is caused by a heated oxidation bath of a bullet dissolved in water or an organic carrier, and of different types of aluminum, such as those of the conventional #1 material. After ignition with a reducing premix consisting of a face fuel, such a lubricant is described in particular in U.S. Pat.
．． 121.036 2 and Belgian Patent No. 575,0
It is disclosed in No. 43.

For compositions of this type, the sensitivity is primarily
It is added by the density of microscopic bubbles of gas produced by chemical reactions in the material.By gelling the guar gum present in the product with a crosslinking agent. , giving the explosive a plasticity with somewhat rubber-like properties.

Advantages of these compositions include increased safety during manufacture as well as during storage, transportation, and use;
- The methods of their production offer a wider variety than is possible with conventional explosives.

This type of composition has a small diameter (i.e. addition ~4Q mm)
This form is insufficient in two respects. One is that as the diameter decreases, its detonation capacity (de
tonation capacity) and air gap testing from one cartridge to the next, which can be compressed and, in mine holes, stop detonation due to the effect of compression waves transmitting the detonation point. Probably.

Thus, numerous improvements have been made to these products in recent years. Of particular value among these improvements are those that improve detonation sensitivity by adding crystallization modifiers to the composition. When the slurry cools, the modifier controls the crystallization of the salts, forming fine crystals that aid detonation and prevent the formation of excessively large crystals.

This method makes it possible to increase sensitivity without having to use excessive proportions of aluminum sensitizer, and
The cartridge has a solid structure with a diameter of less than 20 ffim, so that it can better withstand the effects of compression waves. The influence of this compression wave is greater as the aluminum nitrate content is higher, that is, the crystallization point of the solution used for explosive production is higher.

A common drawback of slurry explosives modified in this way is that they are difficult to package, i.e. the viscosity of the slurry is limited by conventional means [chubu-pack type (chub-p
ack type) i or extrusion gun type machine 1. Furthermore, the usual method used for conventional explosives (dynamite), in which the product is cooled in a tank and then filled into cartridges using a screw-type extruder or a Rolex-type cutting machine, is a batch method. It has the double disadvantage of completely desensitizing the explosive. Also, the cooled product is in solid form, but is a powdery, brittle mass whose cohesiveness is too low to be easily filled into cartridges. This is discussed in US Pat. No. 4.033, which discloses a gelled explosive composition that is friable as a resultant product.

This is the case of the composition described in No. 264.

Therefore, the purpose of this paper is to improve the composition of syrup wipes and to harden the product so that it has sufficient cohesive strength to be easily filled into paper cases using a cut-off cartridge machine. The object of the present invention is to provide an explosive manufacturing method in which it is possible to finally obtain an explosive having a solid structure.

In addition, the invention is characterized by providing a product that hardens rapidly but is not sticky.

The method of the invention makes it possible to obtain cartridges of the type used for dynamite from syrupy detonants without having to worry about filling them due to the friability of the product.

As a result, the present invention involves heating an oxidizing solution containing an inorganic or organic salt dissolved in water and having a conventional composition, and introducing this solution in solid form with an internal fuel based on a metallic fuel. and a reducing premix consisting of a curing agent and
The mixture is then subjected to a process before final solidification of the composition.
Cutting machine preferably Rollex
The present invention provides a method for continuously producing a syrup-like mW silk product that can be filled into a cartridge using a cartridge machine of x type'.

This mixture must be rapidly cooled as soon as it is removed from the device that mixes the oxidizing liquid and the reducing premix.

The addition of the above-mentioned curing agents makes it possible to obtain, on cooling, an explosive composition in a hardened, solid form, that is, cohesive and without any brittle properties.

Surprisingly, a cartridge manufactured by the above method using this composition has an air gap test value of about 5.0 in the case of the present invention. It has the characteristic of increasing up to 4 cm.

This composition was no longer compressible and no channel effect was observed, similar to the composition described in Belgian Patent No. 698,434. Also in this patent, curing of the composition is accomplished by a safe salt.

The curing agent necessary for extrudability is a carboxymethyl cellulose type, and its proportion according to the method of the present invention is 1 to 3% by weight based on the final product i of the explosive composition.
is suitable, between 1.5 and 25% is preferred, and about 2% is particularly preferred.

Carboxymethylcellulose is a well-known product in the slurry explosives industry. It is also often cited as a fuel and thickener, for example in West German Patent No. 1,813,
No. 173, No. 2,826,589 and No. 2,6
No. 43,499, French Patent No. 1, 550, 92
5 and 1.244,201, U.S. Reissue Patent No. 26.115, U.S. Patent No. 3,235,425
No. 3,524,777. Also, certain special properties have been found, such as those for obtaining better crosslinking properties (US Pat. No. 3,818) or improved stability (French Pat. No. 2,006,804). ing. In all these cases, carboxymethylcellulose is the essential component of the oxidizing solution;
Combined with glycol in the aqueous phase, either directly or in a premix (GB 2,013,173).

This invention has another feature. It was discovered that carboxymethyl cellulose acts as a curing agent and is essential for extrudability in cut-off cartridge machines. And, when carboxymethyl cellulose is incorporated into the solid part of the composition (i.e., the reduced premix) according to this invention, unlike the above cited example, it has a simple thickening effect (it only has an effect on high or low viscosity of the product). It also has a crosslinking effect (making the paste significantly more plastic for the desired purpose), an effect on improving water resistance, and an effect on stability.

In this regard, in -1, the oxidizing solution part contains the commonly used guar gums, which by their nature virtually always provide a final product with reduced porcelain properties and a certain plasticity. ) was found to maximize its rigidity and cohesiveness when made into a cartridge. Therefore, guar gum is an essential component of the homogeneous premix when an intermediate between plasticity and rigidity is desired, and it must be self-crosslinking.

It has been found that the composition of the present invention can be easily processed in a cartridge machine by adding a non-adhesive agent such as paste or talc thread to prevent the resulting explosive composition from becoming viscous.

It has been found that the action of the curing agent can be enhanced by the presence of crosslinkers consisting of chromium or antimony, which crosslinkers act on guar gum when it is present.

Particularly satisfactory results are therefore obtained when the composition is rapidly cooled immediately after removal from the oxidizing solution and reducing premix mixer. That is, it can be easily made into a cartridge using a known Rolex type**.

The methods for producing syrupy explosive compositions (slurry explosives) are well known to those skilled in the art, and the present invention is based on the methods of the prior art cited in this specification, which include a curing agent in a solid combustible premix. The composition includes seri.

Particularly favorable results are obtained by adding a crystalline fi'i agent of sodium methylnaphthalene sulfone or its analogous compounds to the oxidizing solution.

Moreover, when 5 to 10% of urea is added in addition to the oxidized salts, the resulting composition 1 has excellent explosive properties.

When a fibrous, hooked structure is to be provided in the composition, it is advantageous to mix polyacrylamide with a carboxymethylcellulose-based curing agent + cIJD.

Next, this invention will be explained in more detail with reference to examples, which are not intended to limit the invention.

Example 1 First, an oxidation solution at 80°C was prepared with the following composition.

Water 16.
95 parts by weight Thiourea 0.11
// Sodium methylnaphthalene sulfonate
2.26 If Sodium Nitrate
6.78p Ammonium Nitrate 73.
79〃Total 100, OO〃-1 A reduction premix having the following composition was prepared.

Aluminum sensitizer 46.15 parts by weight Aluminum (metal fuel) 19.23
s starch 16.92 # Self-crosslinking guar gum 2.3 OII carboxymethyl cellulose (curing agent) 15.40
F total 100.00 p *Biopolymer m: A water-soluble polymer obtained by treating carbohydrates such as cellulose with microorganisms such as Xanthomonas i.

A mixture is prepared by passing the above oxidizing solution into a slurry mixing tank at a ratio of 87 heavy chain parts and 13 parts by weight of the reducing premix. The cut pieces are guided onto a conveyor belt, cooled with water and air, and formed into a mat-like shape at a temperature of about 40-40℃.
It is fed to the knife section of the IF$ machine at 5°C, ie, sufficiently cooled and solidified to fill the cartridge.

Each of the four pieces is firmly placed in a paper case and colored, and when it is sealed, it is colored into the shape of a cartridge.
, its shape is retained.

The weight of the cartridge will depend on the specific gravity of the aerated mulberry, which may optionally range from 0 to 0.8 sodium nitrite in a 75% water bath solution per 100 parts by weight of the composition.
5 parts by weight are prepared by simultaneously introducing the oxidizing solution of Example 1 and the reducing premix into a mixer. Preferably containing 0.4 parts by weight of sodium nitrite, 30 m
Explosives placed in m/200f/ cartridges have a specific gravity of 1.10 to 1.15 and a confinement (co
nfinement) without hexogen 440
When detonated with a detonator containing mg, the air gap test value in air is 60! With I+, the explosive speed is 3,800 ~
4.100 m/sec. When fine powder aluminum was replaced with silicon, the specific gravity was 1.10, and the following test results were obtained.

Explosive power (dust agent 750mg) 360
The explosive power of Example 1 tested with a CC lead block (lθad block) was 400 cc, comparable to the highest grade dynamite.

The method of the invention is applicable to all compositions with the oxidizing solution of Example 1, and the proportion of metal fuel in the reduction premix may vary from 0 to 8 parts by weight. This is illustrated in the following extreme examples.

Example 2 From 89.5% of the oxidizing solution of Example 1 and 10.5% of the reduced premix containing no metal fuel (but the other ingredients are the same as the parts by weight of the premix of Example 1) A composition was prepared. The properties of the obtained composition were as follows.

Specific gravity: 1.05 Explosive power (750mg of excipient): 320C
C Example 3 Metal fuel (A
l) (However, the weight parts of other components are the same as the premix of Example 1, 186 parts by weight).
A composition consisting of 5% was prepared and its properties were as follows.

Specific gravity 1,15 Explosive power (750 mg of detonator) 430c
Example 4 In an explosive similar to the previous example, the effect of the self-crosslinking guar gum added to the premix can be enhanced by 0.85% by weight of crosslinking agent consisting of chromium or antimony.

Example 5 To 86 parts by weight of the oxidizing solution of Example 1 was added 14 mftm of a reducing premix having the following composition.

Aluminum sensitizer 42.85 parts by weight Metal sensitizer 17.85 // Grain
Powder 15.70
〃Self-crosslinking guar gum 2.15
p Calhoki dimethyl cellulose hard (tJ41 1
4.30 #Non-viscous agent (talc)
, 7.15/' The subsequent operations were performed in the same manner as in Examples 1-4.

Does the product have good non-stick properties? It could be easily processed using a cartridge machine.

Example 6 If a fibrous hard #I structure is desired, a carboxymethylcellulose-based 6-carbon compound can be combined with polyacrylamide.

In this case, 87 parts of the limestone liquid of Example 1 was mixed with 13 parts of the reduced premix having the following composition.

Aluminum sensitizer 4230Φ parts Metal fuel 15.38 #
Powder 15.38 N self-crosslinking guacam 2.30 //
Calhoki dimethyl cellulose hardening jllll 13
．． 10 tt polyacrylamide
11.5J tt Town Rare 1 The feature of this product is real @! Example 1
It is similar to the product of 1.

Example 7 The following conventions were used in place of the oxidizing solution of Example 1.

Water 9,77-13.00 Bundle amount Sorta urea 0,11-0.15 #Biopolymer 0.11-015 (Same as Example 1) Methylnaphthalene 0.11-225 Sulfonic acid Sorta urea 5 .75-8.00
Weight part a! Sodium acid 17.25~7
．． 00 f/vitreous ammonium 6690~
69.45 The operations after 11 were carried out in the same manner as in the previous example, and the same results were obtained.

The Rolex type cartridge machine described in this specification is a machine that cuts explosives into strings or sausages and inserts them into cartridges [manufactured by West German Ni-Bumann AG (
N Engineering FPMANN Arif], currently Dynamai) 115
1> Used for phase advancement.

Air gap test method, detoxification velocity of explosives listed in this specification
ty) ff111 settling method and explosive power oil 1 method are the 1977 edition “Propellant and
This is the method described in A2.5E-6 of ``H1Osives''.

Agent: Patent Attorney Shintabe Nogawa

Claims (1)

[Claims] 1. During production, an oxidizing solution containing a dissolved inorganic or organic salt and having a normal composition is heated, and this solution is added in solid form to a solid fuel based on a metal fuel. hardening n1
and the mixture is then filled into the cartridge using a cutting machine before final solidification of the composition. Continuous manufacturing method of things. 2. The method according to claim 1, wherein the cutting machine is a Rolex type cartridge machine. A method according to claim 1 or 2 comprising two claims. 4. A method according to any one of claims 1 to 3 in which the curing agent used in solid form in the reduced premix is carboxymethylcellulose. 5. The ratio of curing agent to the final composition of the explosive composition is 1
5. A method according to any of claims 1 to 4, wherein the amount is 3% by weight. 6. The method according to any one of claims 1 to 5, wherein a non-adhesive agent is added to the mixture. 7. The method according to claim 6, wherein the non-adhesive agent added is talc. 8. The method according to any one of claims 1 to 7, wherein a crosslinking agent made of chromium or antimony is added to the curing agent. 9. The method according to any one of claims 1 to 8, wherein the metal fuel added is aluminum 2 and/or silicon. =10. 10. The method according to claim 1, wherein a crystallization regulator for sodium methylnaphthalene sulfonate is added to the oxidizing solution. 11. The method according to any one of claims 1 to 10, comprising adding an oxidizing solution (from 5 to 10%). 12. The specific gravity of the syrup-like explosive composition is 75% water bath powder. The method according to any one of claims 1 to 11, which is prepared by adding not more than 0.8 parts by weight of sodium nitrite to 100 parts by weight of the composition. 13. Actual dissolution. Heating an oxidizing solution containing inorganic or organic salts and having a conventional composition, mixing this solution with a retrograde premix consisting of a solid fuel based on a metal solvent and a solid curing agent; A cartridge for a syrupy explosive allffl product, which is obtained by filling the mixture into the cartridge using a cutting machine before the composition is finally solidified.