HTPB-based pouring PBX explosive loaded with high-density metal particle killing element and preparation method of HTPB-based pouring PBX explosive

Abstract

The invention relates to a high-density metal particle killing element (HTPB)-based pouring PBX explosive, which is a pouring PBX explosive prepared by mixing high-density inert metal particles and a binder system in a main explosive and adding a process additive, the binder system is composed of hydroxyl-terminated polybutadiene as a binder and an isocyanate curing agent, and the HTPB-based pouring PBX explosive is a high-density metal particle killing element (HTPB)-based pouring PBX explosive. The process additive is composed of an organic ester plasticizer and a curing catalyst triphenyl bismuth. According to the method, PBX system viscosity design is carried out through cooperation of process auxiliaries, settlement-free high-density metal particle killing element loading is achieved, the flying distance of a killing element is effectively controlled, the killing range is precisely controlled, and the precise damage requirement of low-incidental-damage ammunition is met.

Description

Technical Field

[0001] The invention belongs to the technical field of energetic material preparation, and relates to a cast PBX explosive, in particular to a cast PBX explosive added with high-density inert metal particle killer elements and a preparation method thereof. Background Art

[0002] Traditional ammunition is composed of high-energy explosives loaded in a metal shell. After the high-energy explosives explode, the metal shell quickly expands and ruptures under the action of the explosion energy, forming a large number of fragments. These metal fragments fly around under the loading of the explosion energy. When they hit obstacles, their large kinetic energy can cause killing and destructive effects on surrounding personnel and facilities.

[0003] Because the shapes and masses of the fragments formed when the metal shell breaks rapidly under the action of explosive energy vary greatly, and under the loading of explosive explosion energy, the flying distances are different and the flying range is difficult to control. While killing the intended target, it will also cause collateral damage to people and equipment near the target.

[0004] Counter-terrorism operations and urbanization operations are an important combat method in modern warfare. The limitation brought about by this combat method is that it cannot cause large-scale destructive damage to landmarks and facilities. Instead, it requires the killing element to have greater power at close range to ensure efficient damage, and then the power drops rapidly to control the damage within a smaller range, reducing collateral damage to innocent people and facilities around them.

[0005] By adding a certain amount of micron-sized high-density inert metal particles to the explosives, a large number of discrete metal particles replace the fragments formed by traditional metal shells, forming a particle flow killing element with high movement speed but weak speed retention ability. This can greatly reduce the damage to non-military targets and control the flying distance of the killing element, and keep the damage of the ammunition within the expected range, thereby achieving precise damage.

[0006] Wang Shaohong et al. (Cavity characteristics and injury threshold of submillimeter particles penetrating soap targets [J]. Acta Armamentarii, 2024, 45(11): 3868-3878.) used soap targets as biological target equivalent targets to evaluate the damage effect of submillimeter metal particles. The results showed that the density of the particle material has a great influence on the penetration depth of the target. Therefore, the use of high-density metal particles as killing elements is very necessary for the ultimate damage effect of low collateral damage ammunition.

[0007] However, due to the large difference in specific gravity between high-density metal particles and explosives, they cannot be evenly distributed in the explosive charge and are prone to settle at the bottom of the charge, making the charge density uneven, which will lead to unstable explosion performance of the explosive and change the scattering range of the high-density metal particles, affecting the final damage effect.

[0008] Cast PBX explosives are PBX explosives made by using high-energy explosives as the main explosive, adding polymer binders and curing agents, etc. This type of explosive has good safety performance. It is not only insensitive to various stimuli such as bullets, flames and fragments, but also has rubber-like physical properties and extremely low modulus. It also has extremely high detonation energy and good adaptability to the environment. Therefore, it is widely used in warhead charges.

[0009] CN 109467494A discloses a cast PBX explosive with HMX as the main explosive and a solid content of 91%. The explosive has excellent detonation performance and low vulnerability, and has a certain application prospect in large-size warhead charges.

[0010] Cast PBX explosives have many excellent properties. By selecting and adjusting the main explosive, binder, and plasticizer, the energy, mechanical properties, and safety performance of the explosives can be greatly adjusted. At the same time, it has good low fragility. In addition, by increasing the content of energetic solid components in the PBX explosives, the detonation velocity, detonation pressure, or detonation heat of the explosives can be increased, so that the PBX explosives can obtain higher explosive damage power. Therefore, cast PBX explosives are an important research direction in the field of mixed explosives at home and abroad.

[0011] The commonly used binder for cast PBX explosives is hydroxy-terminated polybutadiene (HTPB). The solid component content of cast PBX explosives with HTPB as a binder is usually not higher than 90%. If the solid component is too high, the viscosity of the explosive system is too high and cannot meet the casting process and the applicable period of the slurry. If the solid component is too little, it cannot meet the expected damage effect. If the above problems are improved by adding process additives, other problems may arise.

[0012] CN 103145512A uses 1% styrene as a process aid to obtain a high solid content cast PBX explosive, in which the HMX particle content is as high as 90%, but styrene is difficult to completely remove, and the mechanical properties of the explosive with residual styrene will be greatly affected. In addition, in addition to the performance being affected, its preparation process also becomes more complicated. Summary of the invention

[0013] The purpose of the present invention is to provide a HTPB-based cast PBX explosive loaded with high-density metal particle lethal elements and a preparation method thereof, and to utilize process additives to collaboratively design the viscosity of the PBX system to achieve a non-settling type loaded high-density metal particle lethal element, while ensuring the simplicity of the casting process to meet the requirements of controlling the dispersion of lethal elements in low collateral damage ammunition.

[0014] The HTPB-based cast PBX explosive loaded with high-density metal particle killer elements of the present invention is prepared by mixing high-density inert metal particles in the main explosive, using HTPB as a binder, and adding necessary plasticizers and curing agents.

[0015] Specifically, the HTPB-based cast PBX explosive loaded with high-density metal particles and killing elements described in the present invention is prepared by mixing 50 to 60 parts by weight of high-density inert metal particles and 6.0 to 7.5 parts by weight of a binder system in 34 to 42.5 parts by weight of a main explosive, and adding 1 to 3 parts by weight of a process aid. The binder system is composed of terminal hydroxyl polybutadiene as a binder and 6.5 to 8% by weight of an isocyanate curing agent, and the process aid is composed of an organic ester plasticizer and a curing catalyst triphenyl bismuth (TPB).

[0016] The cast PBX explosive of the present invention utilizes a combination of an organic ester plasticizer and a curing catalyst triphenyl bismuth as a process aid, and synergistically designs the viscosity of the PBX system, which can significantly improve the sedimentation problem of high-density metal particle killer elements in the PBX system and enhance the low collateral damage effect of the high-density metal particle killer elements.

[0017] Adding high-energy explosives RDX or octogen as the main explosive in the pouring PBX explosive of the present invention can ensure the mixing uniformity of the components in the pouring explosive and the explosion energy of the explosive. Preferably, the high-energy explosive is industrial grade 2 RDX or octogen.

[0018] Furthermore, the high-density inert metal particles added to the cast PBX explosive of the present invention are nearly spherical tungsten particles or tungsten carbide particles. In order to control the scattering range of the killing element, the particle diameter of the high-density inert metal particles is preferably 150-300 μm.

[0019] More specifically, the organic ester plasticizer in the cast PBX explosive is any one of dioctyl sebacate (DOS), dioctyl adipate (DOA) or dibutyl phthalate (DBP).

[0020] The cast PBX explosive of the present invention adopts isocyanate curing agent and triphenyl bismuth as curing catalyst, which can accelerate the cross-linking reaction of the system, regulate the viscosity growth of the system, realize the non-sedimentation loading of high-density metal particles, and make the HTPB-based cast PBX explosive loaded with high-density metal particle killer elements have better performance and simpler preparation.

[0021] Furthermore, in the cast PBX explosive of the present invention, the amount of the curing catalyst triphenylbismuth is preferably 0.01 to 0.1% of the total mass of the cast PBX explosive.

[0022] The present invention can prepare high solid content (solid content above 91%) cast PBX explosive with good process performance and storage performance through the synergistic viscosity design scheme, and the high-density metal particles are evenly dispersed without sedimentation.

[0023] Furthermore, the present invention also provides a method for preparing the HTPB-based cast PBX explosive loaded with high-density metal particle killer elements, which specifically comprises: 1) Mixing the hydroxy-terminated polybutadiene binder and the organic ester plasticizer to obtain a premixed system; 2) Add the main explosive into the premixed system in batches, so that the viscosity of the system increases at a uniform rate and the components are mixed evenly; 3) Slowly add high-density inert metal particles into the system with stable viscosity and stir to mix evenly; 4) Continue to add isocyanate curing agent and curing catalyst triphenyl bismuth into the system, and stir evenly to obtain a slurry; 5) The uniformly mixed slurry is poured into a mold, and after vacuum degassing, it is solidified and molded to obtain the HTPB-based cast PBX explosive loaded with high-density metal particle killing elements.

[0024] In the step 2), when the main explosive is added to the premixed system in batches, it is preferred to use a variable-speed electric stirrer to uniformly stir the premixed system at high speed, and then add the main explosive multiple times and slowly. By properly adjusting the speed of the stirrer, the viscosity of the system increases at a uniform rate and the components are mixed evenly.

[0025] Furthermore, when adding high-density inert metal particles to the system in step 3), it is preferred to reduce the speed of the stirrer, slowly add the high-density inert metal particles to the system with stable viscosity, and stir and mix to make the components in the system evenly mixed.

[0026] Furthermore, it is preferred that the rotation speed of the high-speed stirring in step 2) is 180-200 rpm, and the rotation speed is reduced to 70-90 rpm in step 3).

[0027] In the preparation method of the present invention, preferably, after the uniformly mixed slurry is poured into the mold, a vacuum degassing treatment is performed at a vacuum degree of 0.08 to 0.095 MPa for 20 to 30 minutes.

[0028] More preferably, during the vacuum degassing treatment, the slurry may be shaken, preferably at a frequency of 90 to 110 Hz and a shaking time of 5 to 10 minutes.

[0029] Finally, the treated uniform, bubble-free high-density inert metal particle mixed explosive slurry is cured at a constant temperature of 50° C. for not less than 48 hours, and the mold is removed to obtain the HTPB-based cast PBX explosive loaded with high-density metal particle killer elements.

[0030] The HTPB-based cast PBX explosive loaded with high-density metal particles prepared by the present invention adopts heavy metal particles as killing elements, which can effectively control the flight distance of the killing elements and accurately control the damage range.

[0031] Compared with the prior art, the preparation process of the HTPB-based cast PBX explosive of the present invention is simple, does not require a vacuum casting system with a complex structure, and greatly improves the safety of high-density metal particles during the charging process.

[0032] The present invention not only ensures uniform mixing of high-density metal particles in the explosive composition by adjusting viscosity and regulating various process parameters during the preparation process of the HTPB-based cast PBX explosive, but also improves the mechanical strength of the formed column of the HTPB-based cast PBX explosive prepared by the present invention due to the addition of high-density inert metal particles, improves the mechanical properties, and achieves a system solid content of more than 91%, which has broad application prospects in the warhead charge of low collateral damage weapons. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the apparent morphology of the explosive column of the HTPB-based cast PBX explosive loaded with high-density metal particle killing elements prepared in Example 1.

[0034] Figure 2 These are the axial and radial CT scan results of the medicine column in Example 1.

[0035] Figure 3 The surface and cross-sectional morphology of the explosive column of HTPB-based cast PBX explosive loaded with high-density metal particle killing elements prepared in Example 1 are shown.

[0036] Figure 4 These are the axial and radial CT scan results of the Chinese medicine column in Comparative Example 1. Implementation

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of the present invention so that those skilled in the art can well understand and utilize the present invention, rather than limiting the scope of protection of the present invention.

[0038] The production processes, experimental methods or detection methods involved in the embodiments of the present invention, unless otherwise specified, are all conventional methods in the prior art, and their names and / or abbreviations are all conventional names in the field, and are very clear and unambiguous in the relevant application fields. Technical personnel in the field can understand the conventional process steps based on the names and apply the corresponding equipment, and implement them according to conventional conditions or the conditions recommended by the manufacturer.

[0039] The various instruments, equipment, raw materials or reagents used in the embodiments of the present invention are not particularly limited in terms of their sources, and are all conventional products that can be purchased through regular commercial channels, or can be prepared according to conventional methods well known to those skilled in the art. Example

[0040] Example 1

[0041] HTPB-based cast PBX explosive with RDX as the main explosive was prepared using spherical tungsten carbide particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dioctyl sebacate (DOS) as the plasticizer and triphenylbismuth (TPB) as the curing catalyst.

[0042] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0043] Weigh 5.25 g HTPB and 1.02 g DOS, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed RDX into the container several times and mix evenly.

[0044] Weigh 35 g of spherical tungsten carbide particles, add them slowly and multiple times into the container, and stir evenly to make the spherical tungsten carbide particles evenly distributed in the system.

[0045] Weigh 0.35 g of TDI and add it to the mixed system. Continue stirring. After mixing evenly, add 0.35 g of TPB to the system and stir evenly to obtain a slurry with an initial viscosity of 11520 mPa∙s.

[0046] The evenly mixed slurry is poured into a pre-prepared mold, placed in a vacuum drying oven, and after vacuum degassing, placed on a vibration platform for 3 to 5 minutes, and then sent to a 50°C constant temperature oven for curing and molding.

[0047] The curing time of the slurry is 36 hours. After the slurry is completely cured, the mold is removed. Figure 1 The HTPB-based PBX explosive column with heavy metal particles is 30 mm in diameter and 30 mm in height. The surface of the column is smooth, and no defects such as shrinkage cracks are observed. The spherical tungsten carbide particles are evenly dispersed in the column, and there is no obvious sedimentation in the lower area. After testing, the average density of the column is 2.784 g / cm3 .

[0048] Axial and radial CT scans were used to analyze the interior of the drug column, such as Figure 2 As shown in the figure, the spherical tungsten carbide particles are evenly dispersed on the entire cross-section of the propellant, and there is no particle accumulation in the lower area. The test results show that the high-density metal particles can be evenly dispersed in the PBX composite system, without significant particle sedimentation, and the components of the molded propellant are evenly dispersed, and the charging quality is good.

[0049] After the four above-mentioned explosive columns were connected in series, they were detonated with industrial No. 8 detonators and explosive boosters, and target shooting experiments were carried out with soap targets with a Shore hardness of 50 to 60 degrees. The results showed that the maximum penetration depths on the soap targets placed 1.36m, 1.81m and 2.26m away from the center of the explosion were 20.8mm, 22.3mm and 20.0mm respectively.

[0050] Example 2

[0051] HTPB-based cast PBX explosive with RDX as the main explosive was prepared using spherical tungsten carbide particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dioctyl adipate (DOA) as the plasticizer and triphenylbismuth (TPB) as the curing catalyst.

[0052] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0053] Weigh 5.25 g HTPB and 1.05 g DOA, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed RDX into the container several times and mix evenly.

[0054] Weigh 35 g of spherical tungsten carbide particles, add them slowly and multiple times into the container, and stir evenly to make the spherical tungsten carbide particles evenly distributed in the system.

[0055] Weigh 0.35 g of TDI and add it to the mixed system. Continue stirring. After mixing evenly, add 0.35 g of TPB to the system and stir evenly to obtain a slurry with an initial viscosity of 10985 mPa∙s.

[0056] The evenly mixed slurry is poured into a pre-prepared mold, placed in a vacuum drying oven, and after vacuum degassing, placed on a vibration platform for 3 to 5 minutes, and then sent to a 50°C constant temperature oven for curing and molding.

[0057] The slurry solidifies for 36 hours. After the slurry is completely solidified, the mold is removed to obtain a HTPB-based PBX explosive column containing heavy metal particles with a diameter of 30 mm and a height of 30 mm. The average density of the column is 2.767 g / cm 3 .

[0058] Example 3

[0059] HTPB-based cast PBX explosive with octochrome (HMX) as the main explosive was prepared using nearly spherical tungsten particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dibutyl phthalate (DBP) as the plasticizer and triphenylbismuth (TPB) as the curing catalyst.

[0060] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0061] Weigh 5.25 g HTPB and 1.05 g DBP, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed Octogen into the container several times and mix evenly.

[0062] Weigh 35 g of nearly spherical tungsten particles, add them slowly and multiple times into the container, and stir evenly to make the nearly spherical tungsten particles evenly distributed in the system.

[0063] Weigh 0.35 g of TDI and add it to the mixed system, continue stirring, and after mixing evenly, add 0.035 g of TPB to the system and stir evenly.

[0064] The evenly mixed slurry is poured into a pre-prepared mold, placed in a vacuum drying oven, and after vacuum degassing, placed on a vibration platform for 3 to 5 minutes, and then sent to a 50°C constant temperature oven for curing and molding.

[0065] The slurry solidification time is 36 hours. After the slurry is completely solidified, the mold is removed to obtain a HTPB-based PBX explosive column containing heavy metal particles with a diameter of 30 mm and a height of 30 mm. The average density of the column is 2.838 g / cm 3 .

[0066] Example 4

[0067] HTPB-based cast PBX explosive with octochrome (HMX) as the main explosive was prepared using round tungsten particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dioctyl sebacate (DOS) as the plasticizer and triphenylbismuth (TPB) as the curing catalyst.

[0068] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0069] Weigh 5.25 g HTPB and 1.05 g DOS, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed Octogen into the container several times and mix evenly.

[0070] Weigh 35 g of round tungsten particles, add them slowly and multiple times into the container, and stir evenly to make the round tungsten particles evenly distributed in the system.

[0071] Weigh 0.35 g of TDI and add it to the mixed system, continue stirring, and after mixing evenly, add 0.035 g of TPB to the system and stir evenly.

[0072] The evenly mixed slurry is poured into a pre-prepared mold, placed in a vacuum drying oven, and after vacuum degassing, placed on a vibration platform for 3 to 5 minutes, and then sent to a 50°C constant temperature oven for curing and molding.

[0073] The slurry solidifies for 36 hours. After the slurry is completely solidified, the mold is removed to obtain a HTPB-based PBX explosive column containing heavy metal particles with a diameter of 30 mm and a height of 30 mm. The average density of the column is 2.841 g / cm 3 .

[0074] Comparative Example 1

[0075] HTPB-based cast PBX explosive with RDX as the main explosive was prepared using spherical tungsten carbide particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dioctyl sebacate (DOS) as the plasticizer and triphenylbismuth (TPB) as the curing catalyst.

[0076] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0077] Weigh 5.25 g HTPB and 1.02 g DOS, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed RDX into the container several times and mix evenly.

[0078] Weigh 35 g of spherical tungsten carbide particles, add them slowly and multiple times into the container, and stir evenly to make the spherical tungsten carbide particles evenly distributed in the system.

[0079] Weigh 0.35g TDI and add it to the mixed system, continue stirring, and after mixing, add 0.0030g TPB to the system and stir evenly to obtain a slurry. The initial viscosity of the slurry was tested to be 6423mPa∙s.

[0080] The evenly mixed slurry is poured into a pre-prepared mold, placed in a vacuum drying oven, and after vacuum degassing, placed on a vibration platform for 3 to 5 minutes, and then sent to a 50°C constant temperature oven for curing and molding.

[0081] The curing time of the slurry is 168 hours. After the slurry is completely cured, the mold is removed to obtain a HTPB-based PBX explosive column containing heavy metal particles with a diameter of 30 mm and a height of 30 mm. The average density of the tested column is 2.781 g / cm 3 .

[0082] like Figure 3 As shown in the figure, the cross section of the grain along its axial center line is inspected to analyze the internal defects. It can be seen that the prepared grains have undergone varying degrees of particle sedimentation. From the internal cross-section of the grain, it can be seen that the particle stratification phenomenon inside the grain is more obvious, indicating that under this condition, due to the reduction in the amount of TPB used, the particles of the prepared grain are unevenly dispersed and accompanied by significant sedimentation, making it impossible to effectively control the flight distance of the killing element and accurately control the damage range.

[0083] Axial and radial CT scans are also used to analyze the interior of the drug column, such as Figure 4 The figure shows that the particles are unevenly dispersed and concentrated in some areas. The particles in the lower area are obviously accumulated. The test results show that high-density heavy metal particles settle in the PBX system.

[0084] Comparative Example 2

[0085] HTPB-based cast PBX explosive with RDX as the main explosive was prepared using spherical tungsten carbide particles as the killing element, toluene diisocyanate (TDI) as the curing agent, dioctyl sebacate (DOS) as the plasticizer and dibutyltin dilaurate (DBTDL) as the curing catalyst.

[0086] The hydroxyl-terminated polybutadiene (HTPB) was dehydrated in a vacuum drying oven at 110 °C for 3 h.

[0087] Weigh 5.25 g HTPB and 1.02 g DOS, stir at high speed in a container to mix evenly, then slowly add 29.5 g of weighed RDX into the container several times and mix evenly.

[0088] Weigh 35 g of spherical tungsten carbide particles, add them slowly and multiple times into the container, and stir evenly to make the spherical tungsten carbide particles evenly distributed in the system.

[0089] 0.35 g of TDI was weighed and added to the uniformly mixed system, and stirring was continued. After the mixture was uniformly mixed, 0.35 g of DBTDL was added to the system and stirred. The viscosity of the system increased suddenly, making it difficult to carry out subsequent process operations, and the drug column could not be formed and prepared.

[0090] The above embodiments of the present invention do not describe all the details in detail, nor limit the present invention to the above embodiments. Various changes, modifications, substitutions and variations made by ordinary technicians in this field without departing from the principles and purpose of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-density metal particle-loaded HTPB-based cast PBX explosive, which is prepared by mixing 50 to 60 parts by weight of high-density inert metal particles and 6.0 to 7.5 parts by weight of a binder system in 34 to 42.5 parts by weight of a main explosive, and adding 1 to 3 parts by weight of a process aid, wherein: The binder system is composed of terminal hydroxyl polybutadiene as a binder and 6.5-8% by weight of isocyanate curing agent added thereto, and the process aid is composed of an organic ester plasticizer and a curing catalyst triphenyl bismuth.

2. The HTPB-based cast PBX explosive loaded with high-density metal particles as claimed in claim 1 is characterized in that The curing catalyst triphenyl bismuth accounts for 0.01-0.1% of the total mass of the cast PBX explosive.

3. The HTPB-based cast PBX explosive loaded with high-density metal particles as claimed in claim 1 is characterized in that The main explosive is high energy explosive RDX or octogenol.

4. The HTPB-based cast PBX explosive loaded with high-density metal particles as claimed in claim 1 is characterized in that The organic ester plasticizer is any one of dioctyl sebacate, dioctyl adipate or dibutyl phthalate.

5. The HTPB-based cast PBX explosive loaded with high-density metal particles as claimed in claim 1 is characterized in that The high-density inert metal particles are tungsten particles or tungsten carbide particles, and the particle diameter is 150-300 μm.

6. The method for preparing the HTPB-based cast PBX explosive loaded with high-density metal particles as claimed in claim 1 comprises: 1) Mixing the hydroxy-terminated polybutadiene binder and the organic ester plasticizer to obtain a premixed system; 2) Add the main explosive into the premixed system in batches, so that the viscosity of the system increases at a uniform rate and the components are mixed evenly; 3) Slowly add high-density inert metal particles into the system with stable viscosity and stir to mix evenly; 4) Continue to add isocyanate curing agent and curing catalyst triphenyl bismuth into the system, and stir evenly to obtain a slurry; 5) The uniformly mixed slurry is poured into a mold, and after vacuum degassing, it is solidified and molded to obtain the HTPB-based cast PBX explosive loaded with high-density metal particle killing elements.

7. The preparation method according to claim 6, characterized in that The high-density inert metal particles are added after reducing the stirring speed.

8. The preparation method according to claim 6, characterized in that The slurry is subjected to vacuum degassing treatment at a vacuum degree of 0.08 to 0.095 MPa for 20 to 30 minutes.

9. The preparation method according to claim 9, characterized in that During vacuum degassing, an oscillation treatment is performed with an oscillation frequency of 90 to 110 Hz and an oscillation time of 5 to 10 minutes.

10. The preparation method according to claim 6, characterized in that The curing temperature is 50° C. and the curing time is not less than 48 hours.

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