KR100255359B1 - Pressable plastic bonded explosive formulation using hytemp/doa as a binder its preparing method - Google Patents

Abstract

PURPOSE: Provided is a compressed complex gunpowder composition of which charging density is increased and which is insensitive to an external shock. CONSTITUTION: The compressed complex gun powder comprises: (i) 90-96 wt.% of raw material powder(H.M.X); (ii) 1-3 wt.% of acrylate elastic copolymer(HyTemp-4404) as a crosslinking monomer having reactive hydroxy group; and (iii) 3-9 wt.% of D.O.A. The method comprises steps of: (i) dissolving 15-20 wt.% of the acrylate elastic copolymer(HyTemp-4404) in ethyl acetate at a temperature of 50-60 deg.C to prepare a liquid polymer solution; (ii) dispersing 8.0-11.0 wt.% of H.M.X in water to prepare a slurry solution; and (iii) after injecting the polymer solution into the slurry solution at a temperature of 60-70 deg.C to form a granular body, distilling the granular body.

Description

Compression type explosives composition using high temp and DI

The present invention relates to a compression type composite powder composition in which HMX is coated and aggregated using a binder containing acrylate elastic copolymer (HyTemp) and D.O. (Dioctyl Adipate). It relates to a manufacturing method. In particular, the present method uses HyTemp, which is an elastomeric copolymer of ethyl acrylate and butyl acrylate, as a binder in the preparation of a compression type composite powder by coating agglomerated raw material H. M. X with a binder, and as a plasticizer. The present invention relates to a method for producing a compressed composite powder coated with O. a.

Compression-type composite powder is a granulated powder type powder in which a high explosive is added to a powder and agglomerates the powder into a high explosive, and is a powder that can simultaneously increase the packing density and insensitive to external impacts. It is used as the main charge or booster for precision weapon systems.

The manufacturing process of the compressed composite powder is greatly dependent on the characteristics of the raw powder and the binder, and in particular, the selection of the solvent used, the amount of use and the coating method are determined according to the type of binder. The binder should be dissolved in a solvent having excellent solubility to make a liquid polymer solution.When the polymer solution is injected into a slurry solution in which the powdery explosive is dispersed in water, the binder may be dissolved in a powdery high explosive due to the difference in the solubility of the solvent in water. It is a basic principle of the manufacture of a compression type compound powder that causes the coating to aggregate. At this time, the particle size control of the product can be easily performed as the solubility difference between the water and the solvent is large, and at the same time, if the coating of the binder is not easy according to the surface characteristics such as the shape of the raw material powder, roughness of the surface, etc. Be sensitive to external stimuli. In addition, when preparing the composite powder, the particle size distribution, average particle size of the active filler used as a raw material has a great influence on the processability, mechanical properties, performance and sensitivity of the final product. Therefore, the accurate measurement and control of their particle size distribution is a very important part as the first step in the development of composite powder composition.

Sensitivity is the property of gunpowder that can ignite and explode under the action of unwanted chaotic physical phenomena such as external heat or shock. Therefore, high precision weapon systems require safe high explosives with lower sensitivity for higher safety. In general, the closer to the theoretical maximum density (TMD), the lesser the shock and the greater the performance. Therefore, in order to increase stability, reduce sensitivity, and improve compressibility to obtain a high performance composite powder, the optimal particle size distribution of the raw powder and the selection of a binder must be accompanied in the manufacturing process of the composite powder.

In the development of the compressed composite powder composition, since the performance and sensitivity of the final product (compressed composite powder) vary greatly according to the change in the particle size distribution of the raw powder, the present invention controls the particle size distribution of the raw powder and controls the reactive hydroxyl group. Development and preparation of insensitive compressed composite powder using acrylate elastomer (HyTemp-4404) added with hydroxy reactive cure site monomer as binder and D.O.A as additive The purpose is to provide a method.

The present invention is to control the particle size of the raw material gunpowder to improve the stability, to reduce the sensitivity and to improve the compressibility in the development of a compression type composite powder, and to add a crosslinking monomer having a reactive hydroxyl group (HyTemp-4404 ) As a binder to prepare a compression type powder.

A binder that can be used within the scope of the present invention is an acrylate elastomer copolymer (HyTemp-4404) to which a crosslinking monomer having a reactive hydroxyl group is added. The raw material gunpowder uses one kind and five kinds of H. M. X according to the national defense standard (Defense-1376-1002) classification. In addition, D.O.A., Dioctyl Adipate is used as an additive. The preferred compositions thereof are 90 to 96% by weight of H.M.X, 1 to 5% by weight of acrylate elastomer (HyTemp-4404) and 0 to 10% by weight of D.O.A.

The standard manufacturing process of the compressed composite powder according to the present invention is based on the following four steps.

[Step 1]

The acrylate elastomer (HyTemp-4404) and D.O.A are dissolved in ethyl acetate. At this time, the amount of ethyl acetate is from 25 to 15 times the maximum weight of the binder. The temperature is carried out at 50-60 ° C., which is sufficiently stirred for about 3 hours to produce a liquid polymer solution.

[Step 2]

H. M. Disperse X in water. At this time, H. M. X is used by mixing the defense standard 1 type and 5 types in a weight ratio of 3: 1. Water is used in an amount of 8.0 to 11.0 times the weight of H. M. X, and gelvatol is used at 0.001 to 0.005% of the weight of water to enhance the dispersion of H. M. X. After the contents have been injected, the mixture is stirred for about 30 minutes, the contents of the reactor are sufficiently dispersed, and the temperature of the contents is heated to 60 to 70 ° C.

[Step 3]

The binder solution prepared in the first step is injected into the contents of the second step, and the H. X. particles are coated-aggregated with the binder and aged for about 10 minutes while observing the state of the particles. At this time, the particle size of the compressed composite powder is gradually increased, it is possible to increase the size of the particle according to the addition amount of ethyl acetate. When the particle size is adjusted to the desired particle size, additional process water is injected so that the ratio of the total amount is 12.0 to 14.0 times based on the amount of solvent to completely extract the residual solvent and to prevent the particle size from becoming excessively large. Do not change the size or shape of the particles.

[Step 4]

The temperature of the third step is increased to distill ethyl acetate dissolved in water. When it reaches 100 ° C., the reaction mixture is cooled to 50 ° C. again, and the contents are washed with a large amount of water to remove residual ethyl acetate. After collecting the gunpowder and drying it to a moisture content of 0.05% or less in a drying furnace at 60 ℃, to obtain a compressed composite powder using an acrylate elastomer (HyTemp-4404) as a binder.

The following examples are only intended to explain the present invention in more detail through the description of the specific manufacturing method and its effect, and are not intended to limit the present invention by this embodiment.

Among the raw materials used in the examples of the present invention, H. M.X manufactured by Holston, USA, and the binder was manufactured by Zeon Chemical, USA, D. A. used Aekyung oil products.

Example 1

Compressed composite powder has the following composition.

Compressive composite powder was prepared using the following method with the composition as described above.

Step 1: The binder acrylate elastomer copolymer (HyTemp-4404) and the additive D.O.A were sufficiently dissolved in ethyl acetate at 60 ° C. for 3 hours. At this time, the amount of ethyl acetate was used 20 times the weight of the binder.

Second step: One H. M. X was dispersed in gel-batoled water and heated to 70 ° C. At this time, the amount of water was used 8.0 to 11.0 times the weight of H.M.X.

Third step: After injecting the binder solution prepared in the first step to observe the particle size of the particles to reach the particles of the appropriate size, the process is further performed so that the ratio of the total amount of water is 12.0 ~ 14.0 times based on the amount of solvent Water was injected and distilled to 100 ° C. The particle size or shape was not changed during the distillation.

Fourth step: When the content temperature in the third step reaches 100 ℃ again cooled to 50 ℃ and washed, filtered and dried as described above.

EXAMPLES 2-8

In the same manner as in Example 1 was mixed with H. M. X and 5 species to prepare a compression type composite powder, the mixing ratio of 5: 1, 3: 1, 2: 1, 1: 1, respectively. , 1: 2, 1: 3, 0: 1.

[Test 1]

Compression tests were carried out at 30 ° C., 40 ° C., 50 ° C., and 60 ° C. under the pressure of 25,000 psi and 30,000 psi with respect to the compressed composite powder prepared in Examples 1 to 8 above. The results are shown in Table 1 below, and the compressive density was found to be 99% or more of the theoretical maximum density (TMD).

[Test 2]

The Large Scale Gap Test was performed on the compressed composite powder prepared in Examples 1 to 8. L.S.G.Tyran is a comparative test performed to measure the sensitivity to shock of a solid gunpowder, when a card of a certain thickness is inserted between the gunpowder and the booster, and the booster is blown, and the booster is measured according to the impact of the booster. Determining the 50% chance of a gunpowder reaction determines the sensitivity of the gunpowder to shock depending on the number of cards (thickness) between the gunpowder and the booster. In other words, as the number of cards is smaller, the measurement gunpowder is determined to be a safe gunpowder insensitive to shock. Table 2 shows the explosives using a chlorine-containing derivatived acrylate elastomer as a binder and a crosslinking monomer having a reactive hydroxyl group according to the present invention as a binder. The results of the L.S.G.T test with the gunpowder are shown, and it can be seen that the gunpowder according to the present invention is much insensitive to shock and is stable to external impact.

[Test 3]

Detonation velocity of the compressed composite powder prepared in Example 3 was measured. The results are shown in Table 3 below in comparison with the results of gunpowder using an acrylate elastomer which is a derivative containing chlorine as a binder.

[Test 4]

For the compressed compound gunpowder prepared in Example 3 was subjected to a solid target crash test (Susan test). The results are shown in Table 4 below. The robust target collision test compares the relative impact sensitivity of the gunpowder by measuring the ignition characteristics, which indicate how easily the test gunpowder is ignited according to the amount of work due to mechanical impact, and the growth characteristics, which indicate the degree of reaction intensity depending on the increase rate of impact energy. It is a test. The sensitivity of the gunpowder is expressed in terms of the relative reaction energy level or the measured pressure with respect to the impact velocity, which means that the greater the pressure measured at the same impact velocity, the more intense the reaction. According to the following Table 4, the compression type compound gunpowder prepared in Example 3 linearly increases the measured pressure as the coal velocity increases, and exhibits a lower flight impact sensitivity than Composition-B, which is a molten gun. As a result, it can be seen that the gunpowder according to the present invention is a safe gunpowder against a flying shock.

As can be seen from the above test results, the compression type compound powder prepared by the present invention is expected to increase its filling density and insensitive to external impacts, and thus its use as a safer gunpowder is expected.

Claims (5)

Raw material gunpowder, H.M. A compression-type composite powder coated with 1 to 3% by weight of an acrylate elastic copolymer (HyTemp-4404) and 3 to 9% by weight of D.A. added to a cross-linking monomer having a reactive hydroxyl group at X 90 to 96% by weight. As a binder, an acrylate elastomer (HyTemp-4404) was dissolved in ethyl acetate, a solvent, at 15 to 25 wt% at a temperature of 50 to 60 ° C. to prepare a liquid polymer solution, and water was 8.0 to 8.0. The polymer solution is injected into a slurry solution in which 11.0% by weight is dispersed, and a granule is formed at 60 to 70 ° C, followed by distillation. The compression type composite powder according to claim 1, prepared by mixing one of H. M. X and five species in a ratio of 3: 1 as the raw material powder. The compressed composite powder of claim 1, prepared by mixing one of H. M. X and five species in a 5: 1 ratio. The compression type compound powder according to claim 1, wherein only one of H. M. X is used as the raw material powder.