Explosive body for nanodiamond synthesis

Abstract

The explosive body X as the explosive body for nanodiamond synthesis of the present application at least has an explosive main body (10) having a frustum portion (11) and a columnar portion (12). The frustum portion (11) has an upper bottom surface (11a) having an open end of a hole (H) for assembling a detonating portion, and an inclined side surface (11b) forming an imaginary apex angle Θ on one side of the upper bottom surface (11a). The columnar portion (12) is connected to the side opposite to the upper bottom surface (11a) in the frustum portion (11), and extends in a direction away from the upper bottom surface (11a). Such an explosive body for nanodiamond synthesis is suitable for achieving an increase in yield in nanodiamond synthesis based on a detonation method.

Description

Technical Field

[0001] This invention relates to an explosive body capable of synthesizing nanodiamonds using a detonation method. Furthermore, this application claims priority based on Japanese Patent Application No. 2017-111342, dated June 6, 2017, and invokes the entire contents of that application. Background Technology

[0002] In recent years, the development of microparticle diamond materials known as nanodiamonds has progressed. One known method for synthesizing nanodiamonds is the detonation method. In the detonation method, for example, an explosive of a given composition is detonated in, for example, a sealed container, using carbon released from the partially incomplete combustion of the explosive as a raw material, and nanodiamonds are generated by utilizing the pressure and energy of the shock wave generated by the explosion. Techniques for such detonation methods are described, for example, in Patent Documents 1-3 below.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2005-289677

[0006] Patent Document 2: Japanese Patent Application Publication No. 2014-144903

[0007] Patent Document 3: Japanese Patent Application Publication No. 2016-113310 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] For the detonation method, which is used to synthesize nanodiamonds, it is necessary to improve the yield of nanodiamonds as the product.

[0010] The present invention is designed based on the following situation, with the aim of providing an explosive body for nanodiamond synthesis suitable for achieving improved yield in detonation-based nanodiamond synthesis.

[0011] Problem Solving Methods

[0012] The present invention provides an explosive body for synthesizing nanodiamonds, comprising an explosive body having a frustum-shaped portion and a columnar portion. The frustum-shaped portion comprises an upper base surface having an open end with a detonation assembly hole, and an inclined side surface forming an imaginary apex angle on one side of the upper base surface. The columnar portion is connected to the side of the frustum-shaped portion opposite to the upper base surface and extends away from the upper base surface. Specifically, in this explosive body for synthesizing nanodiamonds, the upper base surface of the frustum-shaped portion is narrower than the lower base surface of the frustum-shaped portion, which is designed to be the boundary with the columnar portion, and the inclined side surface of the frustum-shaped portion is inclined between the upper and lower base surfaces, forming an imaginary apex angle on one side of the upper base surface. That is, the frustum-shaped portion has a shape in which the area of ​​a cross-section orthogonal to the separating direction of the two surfaces gradually decreases from the relatively wide lower base surface to the relatively narrow upper base surface. Simultaneously, the columnar portion is designed such that a base surface of the columnar portion, which is the boundary with the frustum-shaped portion, is connected to the lower base surface of the frustum-shaped portion. Such a nanodiamond synthetic explosive body is used in a form in which an initiating part, which serves as an initiating unit, is embedded in the initiating part assembly hole of the explosive body, and the explosive body is detonated by means of the initiating part assembled in the explosive body.

[0013] In explosives for the synthesis of nanodiamonds, in order to properly initiate the explosive, it is necessary to supply initiation energy to the initiation unit with a certain length of initiation unit or part of the initiation section entering the interior of the explosive body, so that an initiation explosion of the unit occurs within the explosive body. Furthermore, the initiation energy propagates from the portion outside the explosive body to the portion inside the explosive body within the initiation unit installed in the explosive body. Regarding such nanodiamond explosive bodies, the inventors have realized that, on a given surface with an opening end having an initiation unit assembly hole, the further away from the opening end—that is, the further away from the initiation unit installed in the explosive body—the more likely it is that a stable detonation is difficult to achieve after ignition or detonation.

[0014] As described above, the explosive body of the nanodiamond synthesis explosive of the present invention has a frustum-shaped portion with a cross-sectional area orthogonal to the two dividing directions that gradually decreases from a relatively wide lower base to a relatively narrow upper base. The narrower upper base of this frustum-shaped portion has an open end for an initiation assembly hole. This configuration is suitable for reducing the area in and around the side with the open end of the initiation assembly hole (upper base) where stable detonation is difficult to achieve after detonation. Therefore, it is suitable for increasing the proportion of the area where stable detonation is achieved after detonation in the entire explosive body. This nanodiamond synthesis explosive body is suitable for achieving improved yield in the synthesis of nanodiamonds using the detonation method.

[0015] In this explosive body for synthesizing nanodiamonds, the imaginary apex angle formed by the inclined side of the frustum portion is preferably 20° to 130°, more preferably 20° to 30°. This configuration helps to improve the yield in the detonation method for synthesizing nanodiamonds using this explosive body for synthesizing nanodiamonds.

[0016] In this explosive body for synthesizing nanodiamonds, the frustum portion preferably has a frustum-shaped cone. Furthermore, in this explosive body for synthesizing nanodiamonds, the frustum portion preferably has a frustum-shaped cone, the columnar portion preferably has a cylindrical shape, and the explosive body is rotationally symmetric. For the shape of the explosive body, higher symmetry is more suitable for increasing the proportion of the region achieving stable detonation within the entire explosive body, thus improving the yield of nanodiamonds.

[0017] The explosive body for synthesizing nanodiamonds preferably further comprises an initiating portion having a portion embedded in an initiating portion assembly hole. This initiating portion preferably comprises a detonator portion and a detonating charge portion. The detonating charge portion is preferably arranged to span the boundary between the frustum-shaped portion and the columnar portion. The embedding length of the initiating portion relative to the initiating portion assembly hole, i.e., the insertion length L of the initiating portion relative to the explosive body, is preferably 1–50 mm, more preferably 2–40 mm, and even more preferably 5–30 mm. This configuration, where the explosive body for synthesizing nanodiamonds comprises the initiating portion as described above as an initiating unit, is suitable for efficiently initiating the explosive body, thus contributing to improving the yield of nanodiamonds.

[0018] The explosive body for synthesizing nanodiamonds preferably comprises a composite explosive. The composite explosive preferably contains 2,4,6-trinitrotoluene (TNT) and RDX as the main explosive agents. In the main explosive agents of the composite explosive, the mass ratio of TNT to RDX is preferably 30:70 to 70:30. These configurations are suitable for synthesizing nanodiamonds via detonation. Attached Figure Description

[0019] Figure 1 This is a perspective view of a nanodiamond synthesis explosive body according to one embodiment of the present invention.

[0020] Figure 2 It is along Figure 1 The cross-sectional view of line II-II in the middle.

[0021] Figure 3 (a) is a cross-sectional schematic diagram of the explosive body of Example 1, and (b) is a cross-sectional schematic diagram of the explosive body of Comparative Example 1.

[0022] Symbol Explanation

[0023] X Explosive Body (Explosive Body for Nanodiamond Synthesis)

[0024] 10. Main body of the explosive

[0025] 11. Frustum section

[0026] 11a Top surface

[0027] 11b Inclined side

[0028] 12 columnar parts

[0029] 20 detonators

[0030] 21 Detonator Department

[0031] 22 Explosives Transfer Department

[0032] H-hole (assembly hole for detonator)

[0033] Ha Open end Detailed Implementation

[0034] Figure 1 and Figure 2 Explosive body X, representing one embodiment of the present invention, is an explosive body for synthesizing nanodiamonds. Figure 1 This is a 3D diagram of explosive component X. Figure 2 It is along Figure 1 The cross-sectional view of line II-II in the figure. The explosive body X has an explosive body 10 and a detonation part 20, and is used in the detonation method as a method for synthesizing nanodiamonds.

[0035] The explosive body 10 of the explosive body X has a shape including a frustum portion 11 and a columnar portion 12. The frustum portion 11 has an upper bottom surface 11a and an inclined side surface 11b. An initiation part assembly hole H is opened in the upper bottom surface 11a. That is, the opening end Ha of the hole H is formed in the upper bottom surface 11a. The inclined side surface 11b is formed on one side of the upper bottom surface 11a. Figure 2The frustum portion 11 is inclined in a manner that forms an imaginary apex angle θ. Specifically, the upper base surface 11a of the frustum portion 11 is narrower than the lower base surface 11c of the frustum portion 11, which is designed to be the boundary with the columnar portion 12. The inclined side surface 11b of the frustum portion 11 is inclined on one side of the upper base surface 11a between these upper base surfaces 11a and lower base surfaces 11c, forming an imaginary apex angle θ. The frustum portion 11 has a shape in which the area of ​​the cross section orthogonal to the direction of separation of the two surfaces gradually decreases from the relatively wide designed lower base surface 11c to the relatively narrow upper base surface 11a. The imaginary apex angle θ formed by the inclined side surface 11b is preferably 20° to 130°, more preferably 20° to 30°. On the other hand, the columnar portion 12 of the explosive body X has a bottom surface 12a and a side surface 12b, which is connected to the side of the frustum portion 11 opposite to the upper base surface 11a, i.e., the designed lower base surface 11c, and extends in a direction away from the upper base surface 11a. In this embodiment, the frustum portion 11 has a frustum shape, the columnar portion 12 has a cylindrical shape, and the explosive body 10 is a rotationally symmetric body with a rotation axis Ax.

[0036] Examples of materials constituting the explosive body 10 include composite explosives. A composite explosive refers to a gunpowder composition containing a powdered explosive agent and a binder polymer. Examples of explosive agents include: cyclotrimethylenetrinitroamine (RDX), i.e., RDX; 2,4,6-trinitrotoluene (TNT); 2,4,6-trinitrobenzenenitramine; cyclotetramethylenetetranitramine, i.e., octogen; nitroguanidine; pentaerythritol tetranitrate (PENT); and diazonitrophenol (DDNP). One or more explosive agents can be incorporated into the composite explosive used to form the explosive body 10. In this embodiment, the explosive agent in the composite explosive is preferably a mixture of TNT and RDX. In this case, the mass ratio of TNT to RDX (TNT / RDX) is, for example, in the range of 30 / 70 to 70 / 30. Examples of binder polymers for composite explosives include: polyurethane and polyester. In addition to these explosive main components and binder polymers, the composite explosive used to form the explosive body 10 may also contain plasticizers, anti-aging agents, etc.

[0037] Such an explosive body 10 can be manufactured, for example, by injection molding or compression molding. In injection molding, a mixture containing polymeric components that form a binder polymer, reactive components such as crosslinking agents, and explosive main particles is injected into a mold and then cured, thereby forming the explosive body. In compression molding, the binder polymer dissolved in a solvent is first mixed with the explosive main particles in water, and the solvent is allowed to evaporate from the mixture, creating composite particles with the explosive main particles coated on their surface by a binder polymer film. Next, the resulting composite particles are compressed in a compression container while being heated as needed. This forms the explosive body.

[0038] The detonating part 20 of the explosive body X is a detonation unit used to detonate the explosive body 10 when the explosive body X is used. It is assembled in the explosive body 10 embedded in the aforementioned hole H of the explosive body 10. In this embodiment, the detonating part 20 has a detonator part 21 and a detonating charge part 22. Examples of detonators used to form the detonator part 21 include instantaneous detonators, segmental detonators, antistatic detonators, electronic delay detonators, and fuse detonators. Examples of detonating charges used to form the detonating charge part 22 include high-sensitivity explosives containing 2,4,6-trinitrophenylmethylnitramine, pentaerythritol tetranitrate, RDX, or a mixture of TNT and RDX as a base material. The detonating charge part 22 is preferably as follows: Figure 2 It is positioned across the boundary between the frustum portion 11 and the columnar portion 12, as shown. The insertion length L of the detonator 20 relative to the assembly hole H, that is, the entry length L of the detonator 20 relative to the explosive body 10, is preferably 1 to 50 mm, more preferably 2 to 40 mm, and even more preferably 5 to 30 mm.

[0039] Such explosive body X is described below, and can be used, for example, for the synthesis of nanodiamonds using detonation.

[0040] In the detonation method used to synthesize nanodiamonds, firstly, the aforementioned explosive body X is placed inside a pressure-resistant container. With a given gas and the explosive present inside the container, the container is then sealed. The container is, for example, made of iron, and its volume is, for example, 0.5–40 m³. 3 The explosive body X is preferably suspended within a container. For example, the suspension rope material can be used simultaneously as a conductor to supply current to both the detonator 20 and the detonator section 21 within the explosive body X, suspending the explosive body X within the container. Furthermore, in such a suspended explosive body X, to prevent the detonator 20 from detaching from the explosive body 10, adhesive tape can be used to reinforce the fixation of the detonator 20 relative to the explosive body 10. The amount or weight of the explosive body 10 used is, for example, 0.05 to 2.0 kg. The gas sealed within the container along with the explosive can have an atmospheric composition or be an inert gas. From the viewpoint of producing nanodiamonds with a low amount of functional groups on the surface of primary particles, the gas sealed within the container along with the explosive is preferably an inert gas. That is, from the viewpoint of producing nanodiamonds with a low amount of functional groups on the surface of primary particles, the detonation method for producing nanodiamonds is preferably carried out in an inert gas atmosphere. For example, at least one selected from nitrogen, argon, carbon dioxide and helium can be used as the inert gas.

[0041] In the detonation method, the detonator 20 is ignited inside the container, causing it to detonate. This serves as the starting point for the main explosive 10 to detonate, resulting in a detonation. Ignition of the detonator 20 can be achieved by supplying detonation energy, such as by energizing the detonator 21 of the detonator 20. Detonation refers to the movement of the surface of a reacting flame at a speed exceeding the speed of sound during an explosion accompanying a chemical reaction. During detonation, using carbon released from partially incomplete combustion of the explosive as a raw material, nanodiamonds are generated through the pressure and energy of the shock wave generated during the explosion. According to the detonation method, nanodiamonds with a primary particle size of less than 10 nm can be appropriately produced. Regarding nanodiamonds, in the products obtained by the detonation method, adjacent primary particles or microcrystals initially aggregate very stably due to van der Waals forces and the contribution of Coulomb interactions between crystal planes, thus forming aggregates. As described above, nanodiamonds can be synthesized using a detonation method employing explosive body X.

[0042] After the detonation process, the container and its interior are cooled by leaving it at room temperature for, for example, 24 hours. Following this natural cooling, the crude nanodiamond product is recovered. For example, the crude nanodiamond product (containing the nanodiamond aggregates and coal formed as described above) adhering to the inner wall of the container can be recovered by scraping it with a scraper. By performing the detonation process as described above a necessary number of times, a desired amount of crude nanodiamond product can be obtained. The crude nanodiamond product thus obtained is then refined as needed.

[0043] As described above, the explosive body 10 of the explosive body X has a frustum-shaped portion 11 whose cross-sectional area, orthogonal to the directions separating the two sides, gradually decreases from a relatively wide lower base 11c to a relatively narrow upper base 11a. The narrow upper base 11a of this frustum-shaped portion 11 has an opening end Ha for a hole H for assembling the detonator. This configuration is suitable for reducing the area where stable detonation is difficult to achieve after detonation on the side with the opening end of the hole for assembling the detonator (the upper base 11a in the explosive body 10) and its vicinity. Therefore, it is suitable for increasing the proportion of the area where stable detonation is achieved after detonation in the entire explosive body. Such an explosive body X demonstrates an improved yield in the synthesis of nanodiamonds using the detonation method.

[0044] In the explosive body X, the inclined side 11b of the frustum portion 11 forms... Figure 2 The hypothetical apex angle θ shown is as described above, preferably 20° to 130°, more preferably 20° to 30°. This configuration helps to improve the yield in the detonation synthesis of nanodiamonds using explosive body X.

[0045] In this embodiment, as described above, the frustum portion 11 has a frustum shape. Furthermore, in this embodiment, as described above, the frustum portion 11 has a frustum shape, the columnar portion 12 has a cylindrical shape, and the explosive body 10 is a rotationally symmetric body. Regarding the shape of the explosive body 10, higher symmetry is more suitable for increasing the proportion of the region achieving stable detonation within the entire explosive body 10, thus improving the yield of nanodiamonds.

[0046] Furthermore, as described above, in this embodiment, the explosive body X includes a detonator section 21 and a detonating charge section 22, wherein the detonating charge section 22 is preferably arranged to span the boundary between the frustum section 11 and the columnar section 12. Moreover, as described above, the insertion length L of the detonator section 20 relative to the detonator assembly hole H, i.e., the entry length L of the detonator section 20 relative to the explosive body 10, is preferably 1 to 50 mm, more preferably 2 to 40 mm, and even more preferably 5 to 30 mm. The configuration of the explosive body X having the detonator section 20 as a detonation unit as described above is suitable for effectively detonating the explosive body 10, and therefore helps to improve the yield of nanodiamonds.

[0047] Clustered nanodiamonds can be obtained from crude nanodiamonds produced by detonation through a refining process, as described below.

[0048] In the refining process, an acid treatment can be performed, in which a strong acid is reacted with the crude nanodiamond product in an aqueous solvent, for example. When the crude nanodiamond product obtained by the detonation method readily contains metal oxides, these metal oxides are oxides of Fe, Co, Ni, etc., derived from containers used in the detonation method. For example, by reacting a given strong acid in an aqueous solvent, the metal oxides can be dissolved / removed from the crude nanodiamond product (acid treatment). As the strong acid used for this acid treatment, inorganic acids are preferred, such as hydrochloric acid, hydrofluoric acid, sulfuric acid, nitric acid, and aqua regia. One or more strong acids can be used in the acid treatment. The concentration of the strong acid used in the acid treatment is, for example, 1 to 50% by mass. The acid treatment temperature is, for example, 70 to 150°C. The acid treatment time is, for example, 0.1 to 24 hours. Furthermore, the acid treatment can be performed under reduced pressure, normal pressure, or pressurized pressure. After such acid treatment, the solid components (including nanodiamond aggregates) are washed with water, for example, by decantation. Preferably, the solid component obtained by decantation is repeatedly washed with water until the pH of the precipitate reaches, for example, 2 to 3. When the content of metal oxides in the crude nanodiamond product obtained by detonation is low, the acid treatment described above can be omitted.

[0049] In the refining process, a solution oxidation treatment can be performed to remove non-diamond carbon such as graphite and amorphous carbon from the crude nanodiamond product (the nanodiamond aggregate before the end of refining) using an oxidant. When the crude nanodiamond product obtained by detonation contains non-diamond carbon such as graphite and amorphous carbon, this non-diamond carbon originates from carbon that has not formed nanodiamond crystals and is released during the partial incomplete combustion of explosives. For example, after the above-mentioned acid treatment, non-diamond carbon can be removed from the crude nanodiamond product by acting a given oxidant in an aqueous solvent, for example (solution oxidation treatment). Examples of oxidants used for this solution oxidation treatment include chromic acid, chromic anhydride, dichromic acid, permanganic acid, perchloric acid and their salts, nitric acid, and mixed acids (a mixture of sulfuric acid and nitric acid). One or more oxidants can be used in the solution oxidation treatment. The concentration of the oxidant used in the solution oxidation treatment is, for example, 3 to 50% by mass. The amount of oxidant used in the solution oxidation process is, for example, 300 to 2000 parts by mass relative to 100 parts by mass of the crude nanodiamond product to be oxidized. The solution oxidation temperature is, for example, 50 to 250°C. The solution oxidation time is, for example, 1 to 72 hours. The solution oxidation process can be carried out under reduced pressure, normal pressure, or pressurized pressure. After such solution oxidation, the solid components (containing nanodiamond aggregates) are washed with water, for example, by decantation. If the supernatant of the initial water wash is discolored, it is preferable to repeatedly wash the solid components with water by decantation until the supernatant becomes transparent to the naked eye.

[0050] Example

[0051] [Example 1]

[0052] Prepare with Figure 3 (a) The explosive body of Example 1 with the dimensions shown. The explosive body 10 of Example 1 is an explosive forming body having a frustum-shaped portion 11 and a cylindrical portion 12, containing trinitrotoluene (TNT) and RDX as the main explosive agents. The explosive body 10 has a mass of 70 g and a density of 1.68 g / cm³. 3The mass ratio of TNT to RDX in the explosive body 10 (TNT / RDX) is 50 / 50. The imaginary apex angle θ formed by the inclined side 11b of the frustum portion 11 of the explosive body 10 is 23°. Furthermore, the detonating part 20 of the explosive body in Example 1 has a detonator part 21 and a booster explosive part 22. The detonator part 21 is a cylindrical No. 6 detonator (trade name "No. 6 instantaneous detonator", diameter 6.9 mm × length 50 mm, manufactured by Kayaku Japan Co., Ltd.). The booster explosive part 22 has a cylindrical shape with a diameter of approximately 7 mm × height of 14 mm and is formed from 800 mg of booster explosive. The insertion length L of the detonating part 20 relative to the explosive body 10 is 30 mm. The detonating part 20 assembled in the explosive body 10 is reinforced in an assembled or fixed state using adhesive tape (not shown).

[0053] The explosive body of Example 1 was used in a nitrogen atmosphere for detonation as a method for synthesizing nanodiamonds. Specifically, a detonation chamber (made of iron, with a volume of 15 m³) was used as a pressure-resistant container. 3 Inside the chamber, the explosive body of Example 1 is suspended by a wire supplying current to its detonator section. With the chamber sealed and in a nitrogen atmosphere, the detonator section 21 is activated, causing the detonating section 20 to detonate, thus detonating the explosive body 10 and causing a detonation. Then, after cooling the detonation chamber and its interior by placing it at room temperature for 24 hours, the crude nanodiamond product (containing aggregates of nanodiamond particles generated by the above detonation method and coal) is recovered from the chamber. The nanodiamond obtained by refining the recovered crude nanodiamond product as described below is weighed, and the yield (%) of nanodiamond (ND) is calculated by dividing the mass of the nanodiamond by the mass of the explosive body (70 g). This value is shown in Table 1.

[0054] The explosive body of Example 1 was used in a detonation method as a method for synthesizing nanodiamonds in a carbon dioxide atmosphere. Specifically, in a detonation chamber (made of iron, with a volume of 15 m³) serving as a pressure-resistant container. 3 Inside the chamber, the explosive body of Example 1 is suspended by a wire supplying current to the detonator section. With the chamber sealed, the detonator section 21 is operated in a carbon dioxide atmosphere to detonate the initiating section 20, causing the explosive body 10 to detonate and resulting in a detonation. Then, after cooling the detonation chamber and its interior by placing it at room temperature for 24 hours, the crude nanodiamond product (containing aggregates of nanodiamond particles generated by the above detonation method and coal) is recovered from the chamber. The nanodiamond obtained by refining the recovered crude nanodiamond product as described below is weighed, and the yield (%) of nanodiamond (ND) is calculated by dividing the mass of the nanodiamond by the mass of the explosive body (70 g). This value is shown in Table 1.

[0055] The explosive body of Example 1 was used in an argon atmosphere for detonation as a method for synthesizing nanodiamonds. Specifically, the detonation was performed in a detonation chamber (made of iron, with a volume of 15 m³) which served as a pressure-resistant container. 3 Inside the chamber, the explosive body of Example 1 is suspended by a wire supplying current to the detonator section. With the chamber sealed and in an argon atmosphere, the detonator section 21 is activated, causing the detonating section 20 to detonate, thus detonating the explosive body 10 and causing a detonation. Then, after cooling the detonation chamber and its interior by placing it at room temperature for 24 hours, the crude nanodiamond product (containing aggregates of nanodiamond particles generated by the above detonation method and coal) is recovered from the chamber. The nanodiamond obtained by refining the recovered crude nanodiamond product as described below is weighed, and the yield (%) of nanodiamond (ND) is calculated by dividing the mass of the nanodiamond by the mass of the explosive body (70 g). This value is shown in Table 1.

[0056] [Examples 2-4]

[0057] Except for the hypothetical apex angle θ being 30° (Example 2), 90° (Example 3), or 120° (Example 4) instead of 23°, each explosive body of Examples 2-4, prepared with the same design as Example 1, was subjected to the same detonation method as described in Example 1 (detonation in nitrogen atmosphere, detonation in carbon dioxide atmosphere, and detonation in argon atmosphere). Then, as described in Example 1, the yield (%) of nanodiamond (ND) was determined after refining the crude nanodiamond product obtained by each detonation method. The values ​​are shown in Table 1.

[0058] [Comparative Example 1]

[0059] Use with Figure 3 (b) The explosive body of Comparative Example 1, with the dimensions shown, was subjected to the same detonation methods as described in Example 1 (detonation in a nitrogen atmosphere, detonation in a carbon dioxide atmosphere, and detonation in an argon atmosphere). The explosive body of Comparative Example 1 has a cylindrical shape with a bottom diameter of 32 mm and a height of 52 mm, and is formed of the same constituent material (containing TNT and RDX) as the explosive body 10 of Example 1, with a mass of 70 g. The detonating part (detonator part, detonating charge part) of the explosive body of Comparative Example 1 has the same structure as the detonating part 20 (detonator part 21, detonating charge part 22) in Example 1, and the entry length L of the detonating part relative to the explosive body is 30 mm. Then, as described in Example 1, the crude nanodiamond products obtained by each detonation method were refined, and the yield (%) of nanodiamond (ND) was determined. The values ​​are shown in Table 1.

[0060] <Refining of Nanodiamonds>

[0061] Clustered nanodiamonds were obtained through the refining process described below.

[0062] First, the crude nanodiamond product obtained by detonation was subjected to an acid treatment as a refining step. Specifically, a slurry obtained by adding 6 L of 10% hydrochloric acid to 200 g of the crude nanodiamond product was heated under reflux at atmospheric pressure for 1 hour. The heating temperature during this acid treatment was 85–100 °C. Next, after cooling, the solid components (containing nanodiamond aggregates and coal) were washed with water by decantation. This washing of the solid components by decantation was repeated until the pH of the precipitate reached 2 from the low pH side. Next, a mixed acid treatment, a solution oxidation treatment, was performed as a refining step. Specifically, a slurry was prepared by adding 6 L of 98% sulfuric acid aqueous solution and 1 L of 69% nitric acid aqueous solution to the precipitate obtained by decantation after acid treatment (containing nanodiamond aggregates). This slurry was then heated under reflux at atmospheric pressure for 48 hours. The heating temperature during this oxidation treatment was 140–160 °C. Next, after cooling, the solid component (containing nanodiamond aggregates) was washed with water by decantation. When the initial supernatant became discolored, the solid component was repeatedly washed by decantation until the supernatant became transparent upon visual inspection. The supernatant was then removed by decantation. The remaining component after decantation was then dried to obtain dried powder (nanodiamond powder). Evaporative drying and solidification using an evaporator was employed as the drying method. As described above, clustered nanodiamond powder was obtained from the crude nanodiamond product obtained by the detonation method.

[0063] [evaluate]

[0064] The explosive body 10 of Examples 1-4 has a shape in which a frustum-shaped portion 11 is connected to a cylindrical portion 12. Using the explosive body 10 of Examples 1-4, a high yield of nanodiamonds can be achieved in the detonation method compared with the cylindrical explosive body of Comparative Example 1.

[0065] [Table 1]

[0066]

[0067] In summary, the structure and variations of the present invention are described below.

[0068] [Appendix 1] An explosive body for synthesizing nanodiamonds, comprising an explosive body having:

[0069] The frustum portion has an upper bottom surface with an open end having an assembly hole for the detonator, and an inclined side surface forming an imaginary apex angle on one side of the upper bottom surface; and

[0070] The columnar portion is connected to the side of the aforementioned frustum portion opposite to the aforementioned upper bottom surface, and extends in a direction away from the aforementioned upper bottom surface.

[0071] [Note 2] According to Note 1, the nanodiamond explosive body is used for synthesis, wherein the above-mentioned imaginary apex angle is 20° to 130°.

[0072] [Note 3] According to Note 1, the nanodiamond explosive body is used for synthesis, wherein the above-mentioned imaginary apex angle is 20° to 30°.

[0073] [Appendix 4] The explosive body for synthesizing nanodiamonds according to any one of Appendices 1 to 3, wherein the above-mentioned frustum portion has a frustum shape.

[0074] [Appendix 5] The explosive body for synthesizing nanodiamonds according to any one of Appendices 1 to 4, wherein the frustum portion has a frustum shape, the columnar portion has a cylindrical shape, and the explosive body is a rotationally symmetric body.

[0075] [Appendix 6] The nanodiamond synthetic explosive body according to any one of Appendices 1 to 5 further comprises an initiating part having a portion embedded in the above-mentioned initiating part assembly hole.

[0076] [Note 7] The explosive body for synthesizing nanodiamonds according to Note 6, wherein the above-mentioned detonation part has a detonator part and a detonating charge part.

[0077] [Note 8] According to Note 7, the explosive body for synthesizing nanodiamond is provided, wherein the explosive transfer portion is disposed across the boundary between the frustum portion and the columnar portion.

[0078] [Appendix 9] The explosive body for synthesizing nanodiamond according to any one of Appendices 6 to 8, wherein the embedding length of the detonating part relative to the assembly hole of the detonating part is 1 to 50 mm, 2 to 40 mm, or 5 to 30 mm.

[0079] [Note 10] The explosive body for synthesizing nanodiamonds according to any one of Notes 1 to 9, wherein the explosive body comprises a composite explosive.

[0080] [Note 11] According to Note 10, the nanodiamond synthetic explosive contains 2,4,6-trinitrotoluene (TNT) and RDX as the main explosive agents.

[0081] [Note 12] According to the explosive body for synthesizing nanodiamonds described in Note 11, the mass ratio of 2,4,6-trinitrotoluene to RDX in the above-mentioned explosive main agent is 30:70 to 70:30.

Claims

1. An explosive body for synthesizing nanodiamonds, wherein the explosive body uses carbon released from the partial incomplete combustion of explosives as a raw material to synthesize nanodiamonds. The explosive body comprises an explosive main body, which has the following characteristics: The frustum portion has an upper bottom surface with an open end having an assembly hole for the detonator, and an inclined side surface forming an imaginary apex angle on one side of the upper bottom surface; and A columnar portion, which is connected to the side of the frustum-shaped portion opposite to the upper base surface, and extends in a direction away from the upper base surface. in, The explosive body is manufactured using either injection or compression methods. The nanodiamond synthetic explosive body further comprises a detonating part, which has a portion embedded in the assembly hole of the detonating part. The detonation unit comprises a detonator section and a detonating charge section. The explosive charge section is positioned across the boundary between the frustum section and the columnar section.

2. The explosive body for synthesizing nanodiamonds according to claim 1, wherein, The imaginary apex angle is 20°~130°.

3. The explosive body for synthesizing nanodiamonds according to claim 1, wherein, The imaginary apex angle is 20°~30°.

4. The explosive body for synthesizing nanodiamonds according to any one of claims 1 to 3, wherein, The frustum portion has a frustum shape.

5. The explosive body for synthesizing nanodiamonds according to any one of claims 1 to 3, wherein, The embedment length of the detonator relative to the assembly hole of the detonator is 1~50mm.

6. The explosive body for synthesizing nanodiamonds according to any one of claims 1 to 3, wherein, The explosive body comprises a composite explosive.

7. The explosive body for synthesizing nanodiamonds according to claim 6, wherein, The composite explosive contains 2,4,6-trinitrotoluene and RDX as the main explosive agents.

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