Energy-containing binder coated DNTF explosive and preparation method thereof

Abstract

The invention relates to the technical field of explosives, in particular to an energetic binder coated DNTF explosive and a preparation method thereof.The preparation method comprises the following steps that S1, an energetic binder is dissolved in an organic solvent, and an energetic binder solution with the mass percent being 1%-20% is obtained; s2, putting 3, 4-dinitrofurazan furazan (DNTF) powder into water, heating, stirring and dispersing, so as to obtain DNTF turbid liquid; s3, dropwise adding the energetic binder solution prepared in the step S1 into the DNTF suspension prepared in the step S2, stirring, then carrying out vacuumizing treatment, and after the organic solvent is volatilized, sequentially carrying out suction filtration, washing and sieving to obtain DNTF explosive particles; the problem that the energy output of the DNTF explosive is reduced in the existing DNTF explosive packaging technology, so that the further application of the DNTF explosive in the application scene requiring high performance and high safety is limited is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of explosives, and specifically to an energetic binder-coated DNTF explosive and its preparation method. Background Art

[0002] With the development of technology and the increasing complexity of the application environment, the demand for high-performance materials is also continuously increasing. 3,4-Dinitrofurazanyl furazan (DNTF), as a third-generation high-energy material, with its unique molecular structure, integrating furazan, furazanyl oxide and nitro groups, exhibits the advantage of a low melting point, only 110 °C; moreover, it also has a high density, with a theoretical value reaching 1.937 g / cm 3 ; in addition, DNTF also shows high-energy characteristics, with a detonation velocity of up to 9250 m / s and a detonation heat of 5798 J / g. These characteristics make DNTF show broad application potential in many fields, especially in occasions where high energy output is required. However, DNTF has a fatal defect, that is, it has relatively high mechanical and thermal sensitivities. Under the continuous heating of external thermal stimuli or continuous mechanical impact, DNTF is prone to rapid hot ignition growth. Especially when it is used as a casting carrier, once it melts and forms a continuous phase when heated, it may quickly change from a combustion state to a detonation state, which greatly affects its use safety as an explosive.

[0003] Nowadays, coating the insensitive agent on the surface of explosive particles through coating technology is still one of the simplest and feasible means to reduce sensitivity.

[0004] However, the existing DNTF explosive coating technology, although it can effectively reduce the mechanical and thermal sensitivities of DNTF explosives, also reduces their energy output, which limits the further application of DNTF explosives in application scenarios that require high performance and high safety.

[0005] Therefore, it is necessary to invent an energetic binder-coated DNTF explosive and its preparation method to solve the above problems. Summary of the Invention

[0006] The present invention provides an energetic binder-coated DNTF explosive and its preparation method to solve the problem that the existing DNTF explosive coating technology reduces the energy output of DNTF explosives, resulting in limited further application of DNTF explosives in application scenarios that require high performance and high safety.

[0007] The present invention is implemented by adopting the following technical solutions:

[0008] A preparation method of an energetic binder-coated DNTF explosive, comprising the following steps:

[0009] S1: Dissolve the energetic binder in an organic solvent to obtain an energetic binder solution with a mass percentage of 1% - 20%.

[0010] S2: Put 3,4 - dinitrofurazanfuroxan (DNTF) powder into water, heat it, and stir to disperse, obtaining a DNTF suspension.

[0011] S3: Drop the energetic binder solution prepared in S1 into the DNTF suspension prepared in S2, stir, then perform vacuum treatment. After the organic solvent evaporates, perform suction filtration, washing, and sieving in sequence to obtain DNTF explosive particles.

[0012] S4: Dry the DNTF explosive particles in an oven to obtain an explosive shaping powder sample.

[0013] S5: Press the explosive shaping powder sample in a press to obtain DNTF explosive coated with an energetic binder.

[0014] Furthermore, the mass percentage of the energetic binder to 3,4 - dinitrofurazanfuroxan (DNTF) powder is 1% - 20%.

[0015] Furthermore, the organic solvent is one of ethyl acetate and acetone.

[0016] Furthermore, the energetic binder is one or more of glycidyl azide polymer (GAP) and nitrocellulose (NC).

[0017] Furthermore, when the energetic binder is glycidyl azide polymer (GAP), a curing agent needs to be added to the obtained energetic binder solution and stirred evenly. The curing agent is one of isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), and diphenylmethane diisocyanate (HDI), and the mass ratio of glycidyl azide polymer (GAP) to the curing agent is (1 - 2):1.

[0018] Furthermore, in step S2: the mass percentage of 3,4 - dinitrofurazanfuroxan (DNTF) powder to water is 10% - 30%. After putting 3,4 - dinitrofurazanfuroxan (DNTF) powder into water, heat it to 50°C - 70°C, and the stirring time is 10 min - 30 min.

[0019] Furthermore, in step S3: the stirring speed is 300 rpm - 800 rpm.

[0020] Furthermore, in step S4: the drying temperature is 40°C - 60°C, and the drying time is 6 h - 48 h.

[0021] Further, in step S5: the pressing method is pressure-holding pressing, and the pressure-holding time is 3 min to 6 min.

[0022] An energetic binder-coated DNTF explosive, which is obtained based on the preparation method of an energetic binder-coated DNTF explosive described in the present invention.

[0023] The present invention provides a water suspension coating method that can not only improve the safety of DNTF explosives but also not significantly reduce their energy characteristics. The process flow is simple and the conditions are mild. By using an energetic binder to microsphere coat DNTF crystals, a coating layer can be formed on the surface of the DNTF explosive, changing its response mode under external forces, that is, from a continuous phase to a discontinuous phase, thus effectively reducing the risk of detonation. It is particularly noteworthy that the selected energetic binder itself contains energy groups, which means that while providing additional protection, the high energy characteristics of the DNTF explosive can be maintained without being significantly affected. Therefore, this energetic binder-coated DNTF explosive and its preparation method provide a new solution for achieving both high performance and high safety, and are of great significance for promoting technological innovation and development in related fields. Description of the Drawings

[0024] Figure 1 is a process flow schematic diagram of the preparation method of the energetic binder-coated DNTF explosive in the present invention.

[0025] Figure 2 is an SEM image of an existing uncoated energetic binder DNTF explosive.

[0026] Figure 3 is an SEM image of the GAP-coated DNTF explosive prepared in Example 1 of the present invention.

[0027] Figure 4 is an SEM image of the NC-coated DNTF explosive prepared in Example 2 of the present invention.

[0028] Figure 5 is an SEM image of the GAP and NC co-coated DNTF explosive prepared in Example 3 of the present invention. Detailed Embodiments

[0029] The following will further illustrate the present invention in conjunction with embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so that those skilled in the art can better understand and utilize the present invention, rather than limiting the protection scope of the present invention.

[0030] In the embodiments of the present invention, the experimental methods, production processes, instruments, and equipment involved, their names and abbreviations are all conventional names in the field, which are very clear and definite in the relevant application fields. Those skilled in the art can understand the conventional process steps according to the names and apply the corresponding equipment, and implement them under conventional conditions or the conditions recommended by the manufacturer.

[0031] There are no special restrictions on the sources of various raw materials or reagents used in the embodiments of the present invention, and they are all conventional products that can be obtained by purchasing in the market. They can also be prepared according to the conventional methods well-known to those skilled in the art.

[0032] Figure 1 It is a schematic flow chart of the preparation method of the energetic binder-coated DNTF explosive in the present invention. The following embodiments are all prepared according to this process flow to prepare DNTF explosives.

[0033] Example 1

[0034] A preparation method of an energetic binder-coated DNTF explosive includes the following steps:

[0035] S1: Weigh 0.5 g of glycidyl azide polymer (GAP), place it in a beaker, add 5 ml of ethyl acetate solution, stir with a glass rod until the glycidyl azide polymer (GAP) is completely dissolved, and then add isophorone diisocyanate (IPDI) to obtain a glycidyl azide polymer (GAP) solution, and the mass ratio of glycidyl azide polymer (GAP) to isophorone diisocyanate (IPDI) is 1.4:1;

[0036] S2: Weigh 9.5 g of 3,4-dinitrofurazanfuroxan (DNTF) powder, place it in a wide-mouth bottle, add 50 g of deionized water, heat to 60 °C and keep warm, stir and disperse for 20 min to obtain a DNTF suspension;

[0037] S3: Drop the glycidyl azide polymer (GAP) solution prepared in S1 into the DNTF suspension prepared in S2, stir at a stirring speed of 500 rpm, perform vacuum pumping after stirring, and perform suction filtration, washing, and sieving in sequence after the organic solvent volatilizes to obtain DNTF explosive particles;

[0038] S4: Put the DNTF explosive particles into an oven for drying at a drying temperature of 45 °C and a drying time of 24 h to obtain an explosive molding powder sample;

[0039] S5: Put the explosive molding powder sample into a molding press and press it into a cylindrical shape. The pressing method is pressure holding pressing, and the pressure holding time is 3 min to obtain a cylindrical GAP-coated DNTF explosive.

[0040] Comparison Figure 2 The SEM image of the existing DNTF explosive without coated energetic binder shows that Figure 3 by using the water suspension coating process and taking GAP as the coating agent to coat the DNTF explosive, a distinct layered binder can be seen wrapping the surface of the DNTF explosive.

[0041] It can be seen from the mechanical sensitivity test results in Table 1 that GAP can reduce the mechanical sensitivity of the DNTF explosive. The addition of GAP reduces the impact sensitivity of the DNTF explosive from 32% to 12% and the friction sensitivity from 100% to 24%. After GAP coats the DNTF explosive, the surface of the DNTF explosive has a GAP coating structure. When subjected to external stimuli, the GAP coating can absorb part of the energy and reduce the formation of hot spots. By coating the DNTF explosive with GAP, when the DNTF explosive melts upon heating, GAP can play an isolation role, changing the original continuous phase formed by the heated DNTF explosive into mutually isolated discrete phases, thus reducing hot spots.

[0042] Example 2

[0043] A preparation method of an energetic binder-coated DNTF explosive, comprising the following steps:

[0044] S1: Weigh 0.5 g of nitrocellulose (NC), place it in a beaker, add 10 ml of ethyl acetate solution, and stir with a glass rod until the nitrocellulose (NC) is completely dissolved to obtain a nitrocellulose (NC) solution;

[0045] S2: Weigh 9.5 g of 3,4-dinitrofurazanyl oxidofurazan (DNTF) powder, place it in a wide-mouth bottle, add 50 g of deionized water, heat to 60 °C and keep warm, stir and disperse for 20 min to obtain a DNTF suspension;

[0046] S3: Drop the nitrocellulose (NC) solution prepared in S1 into the DNTF suspension prepared in S2, and stir at a stirring speed of 500 rpm. After stirring, perform vacuum treatment. After the organic solvent volatilizes, perform suction filtration, washing, and sieving in sequence to obtain DNTF explosive particles;

[0047] S4: Place the DNTF explosive particles in an oven for drying at a drying temperature of 45 °C and a drying time of 24 h to obtain an explosive shaped powder sample;

[0048] S5: Place the explosive shaped powder sample in a press to press it into a cylindrical shape. The pressing method is pressure holding pressing, and the pressure holding time is 3 min to obtain a cylindrical NC-coated DNTF explosive.

[0049] Comparison Figure 2SEM image of the existing uncoated DNTF explosive containing energetic binder. From Figure 4 It can be seen that the water suspension coating process is adopted, and NC is used as the coating agent to coat the DNTF explosive, and the surface of the DNTF explosive is completely wrapped by NC.

[0050] From the mechanical sensitivity test results in Table 1, it can be seen that NC can reduce the mechanical sensitivity of the DNTF explosive. The addition of NC reduces the impact sensitivity of the DNTF explosive from 32% to 12%, and the friction sensitivity from 100% to 28%. After NC coats the DNTF explosive, the surface of the DNTF explosive has a NC coating structure. When stimulated by the outside world, the NC coating can absorb part of the energy and reduce the formation of hot spots. By coating the DNTF explosive with NC, when the DNTF explosive melts when heated, NC can play an isolation role, making the continuous phase formed by the original DNTF explosive when heated become isolated discrete phases, reducing hot spots.

[0051] Example 3

[0052] A preparation method of an energetic binder-coated DNTF explosive, comprising the following steps:

[0053] S1: Weigh 0.2 g of nitrocellulose (NC), place it in a beaker, add 4 ml of ethyl acetate solution, and stir with a glass rod until the nitrocellulose (NC) is completely dissolved to obtain a nitrocellulose (NC) solution; weigh 0.2 g of glycidyl azide polyether (GAP), place it in another beaker, add 2 ml of ethyl acetate solution, and stir with a glass rod until the glycidyl azide polyether (GAP) is completely dissolved, and then add isophorone diisocyanate (IPDI) to obtain a glycidyl azide polyether (GAP) solution, and the mass ratio of glycidyl azide polyether (GAP) to isophorone diisocyanate (IPDI) is 1.4:1;

[0054] S2: Weigh 9.6 g of 3,4-dinitrofurazanyl oxidofurazan (DNTF) powder, place it in a wide-mouth bottle, add 50 g of deionized water, heat to 60 °C and keep warm, stir and disperse for 20 min to obtain a DNTF suspension after stirring and dispersing;

[0055] S3: Slowly drip the nitrocellulose (NC) solution and glycidyl azide polyether (GAP) solution prepared in S1 into the DNTF suspension prepared in S2, and stir at a stirring speed of 500 rpm. After stirring, perform vacuum treatment. After the organic solvent volatilizes, perform suction filtration, washing, and sieving in sequence to obtain DNTF explosive particles;

[0056] S4: Place the DNTF explosive particles in an oven for drying at a drying temperature of 45 °C for 24 h to obtain an explosive molding powder sample after drying;

[0057] S5: Place the explosive molding powder sample into a molding press and press it into a cylindrical shape. The pressing method is pressure-holding pressing, and the pressure-holding time is 3 min. After pressing, a cylindrical DNTF explosive co-coated with GAP and NC is obtained.

[0058] Comparison Figure 2 SEM image of the existing uncoated DNTF explosive containing an energetic binder. From Figure 5 It can be seen that after using the water suspension coating process to coat DNTF explosive with GAP and NC as coating agents, there is an obvious binder layer wrapped on the surface of the DNTF explosive.

[0059] From the mechanical sensitivity test results in Table 1, it can be seen that GAP and NC can reduce the mechanical sensitivity of DNTF explosive. The addition of GAP and NC reduces the impact sensitivity of DNTF explosive from 32% to 20%, and the friction sensitivity from 100% to 48%. After GAP and NC coat DNTF explosive, the surface of DNTF explosive has a coating structure of GAP and NC. When subjected to external stimuli, the GAP and NC coating layer can absorb part of the energy and reduce the formation of hot spots. By coating DNTF explosive with GAP and NC, when DNTF explosive melts upon heating, GAP and NC can play an isolation role, changing the original continuous phase formed by DNTF explosive upon heating into mutually isolated discrete phases, reducing the generation of hot spots and lowering the ignition growth rate.

[0060] Table 1 Mechanical sensitivity test results

[0061]

[0062] Table 1 shows the mechanical sensitivity test results. The impact sensitivity of the explosive sample is tested by the explosion probability method of impact sensitivity in 601.1 of the national standard GJB772A-97. The specific test uses a drop hammer with a weight of 2 kg and a drop height of 25 cm; the friction sensitivity of the explosive sample is tested by the explosion probability method of friction sensitivity in 602.1 of the national standard GJB772A-97. The specific test uses a friction sensitivity tester with a pendulum angle of 66° and a gauge pressure of 2.5 MPa for the pressure gauge.

[0063] The above further elaborates on the purpose and technical solution of the invention. It should be understood that the above embodiments of the present invention do not elaborate on all details and do not limit the present invention to only the above embodiments. Various changes, modifications, substitutions, and variations made by those of ordinary skill in the art to these embodiments without departing from the principle and purpose of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a DNTF explosive coated with an energetic binder, characterized in that: The following steps are involved: S1: dissolving an energetic binder in an organic solvent to obtain an energetic binder solution having a mass percentage of 1% to 20%; S2: Put 3,4-dinitrofurazanyl furazan oxide (DNTF) powder into water, heat it, stir and disperse it, and obtain DNTF suspension; S3: adding the energetic binder solution prepared in S1 dropwise to the DNTF suspension prepared in S2, stirring and vacuumizing, filtering, washing and sieving in sequence after the organic solvent evaporates, to obtain DNTF explosive particles; S4: placing the DNTF explosive particles in an oven to dry, to obtain an explosive modeling powder sample; S5: placing the explosive modeling powder sample into a compression molding machine for compression to obtain the DNTF explosive coated with the energetic binder.

2. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: The mass percentage of the energetic binder and 3,4-dinitrofurazanyl furazan oxide (DNTF) powder is 1% to 20%.

3. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: The organic solvent is one of ethyl acetate and acetone.

4. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: The energetic binder is one or more of glycidyl polyazide (GAP) and nitrocellulose (NC).

5. The method for preparing a DNTF explosive coated with an energetic binder according to claim 4, characterized in that: When the energetic binder is polyazide glycidyl ether (GAP), a curing agent needs to be added to the prepared energetic binder solution and stirred evenly, the curing agent is one of isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), and diphenylmethane diisocyanate (HDI), and the mass ratio of polyazide glycidyl ether (GAP) to the curing agent is (1~2):

1.

6. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: In step S2, the mass percentage of the 3,4-dinitrofurazanyl furazan oxide (DNTF) powder and water is 10% to 30%, and the 3,4-dinitrofurazanyl furazan oxide (DNTF) powder is placed in water and heated to 50° C. to 70° C., and the stirring time is 10 min to 30 min.

7. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: In step S3: the stirring speed is 300 rpm to 800 rpm.

8. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: In step S4: the drying temperature is 40°C to 60°C, and the drying time is 6 h to 48 h.

9. The method for preparing a DNTF explosive coated with an energetic binder according to claim 1, characterized in that: In step S5, the pressing method is pressure-maintaining pressing, and the pressure-maintaining time is 3 min to 6 min.

10. A DNTF explosive coated with an energetic binder, characterized in that: The DNTF explosive is obtained based on the preparation method of an energetic binder-coated DNTF explosive as described in any one of claims 1 to 9.

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