An emulsion explosive composition and its manufacturing process

Abstract

This invention provides an emulsion explosive composition and its manufacturing process, relating to the field of explosive preparation technology. The emulsion explosive composition of this invention comprises the following materials in parts by weight: 64-70 parts porous granular ammonium nitrate, 8.5-9.5 parts sodium nitrate, 2-5 parts potassium nitrate, 3-5 parts urea, 9.5-10.5 parts water, 5-7 parts composite oil phase, 2-3 parts emulsifier, 2-5 parts diatomaceous earth, and 6-10 parts glass microspheres. By adjusting the proportions of each component and the processing technology, the emulsion explosive composition of this invention achieves higher energy density, lower critical detonation temperature, and better stability. Simultaneously, this composition also exhibits good environmental performance, meeting the requirements of relevant environmental regulations, and providing a new direction for the development of the emulsion explosive industry.

Description

Technical Field

[0001] This invention relates to the field of explosives preparation technology, specifically to an emulsion explosive composition and its production process. Background Technology

[0002] With the continuous development of modern engineering blasting technology, emulsion explosives, as a high-performance industrial explosive, have received widespread attention and application due to their excellent blasting performance, environmental friendliness, and safety. Emulsion explosives are water-in-oil (W / O) emulsions prepared by emulsification technology, consisting of an aqueous oxidizer phase, an oily combustible phase, and other additives. They possess characteristics such as multiphase nature, high dispersibility, and thermodynamic instability. Through the action of emulsifiers, microdroplets of the oxidizer can be uniformly dispersed in an oil-phase continuum containing dispersed bubbles or porous materials, forming a water-in-oil emulsion explosive. This type of explosive plays an important role in mining, transportation, water conservancy, and urban construction.

[0003] Internationally, the research and application of emulsion explosives are quite mature. Well-known companies such as IRECO in the United States have successfully developed vehicles for loading mixed emulsion explosives, achieving mechanization and intelligentization of loading and manufacturing processes, greatly improving production efficiency and safety. Meanwhile, extensive research has been conducted abroad on the formulation and production processes of emulsion explosive compositions, continuously optimizing performance and improving production efficiency.

[0004] In China, significant progress has been made in the research and application of emulsion explosives. With the continuous development of the national economy, the application of emulsion explosives in economic construction has become more widespread, and their production volume has gradually increased. However, compared with foreign countries, my country's emulsion explosives industry still lags behind in terms of production technology, equipment, and automation. Therefore, the research and development of new emulsion explosive compositions and their production processes is of great significance for improving the overall level of my country's emulsion explosives industry.

[0005] Although the emulsion explosives industry has achieved significant development, with continuous improvement in production technology and safety techniques, the requirements for the performance of emulsion explosive compositions and production processes are becoming increasingly stringent. Furthermore, some problems still exist in actual production, such as how to optimize the formulation of emulsion explosive compositions to achieve better blasting performance and safety; and how to improve production processes to increase production efficiency and product quality. Based on this, the present invention provides an emulsion explosive composition and its production process. Summary of the Invention

[0006] The purpose of this invention is to provide an emulsion explosive composition and its production process, which optimizes the energy density, critical detonation temperature and stability of the emulsion explosive.

[0007] On one hand, the present invention provides an emulsion explosive composition comprising the following materials in parts by weight: 64-70 parts of porous granular ammonium nitrate, 8.5-9.5 parts of sodium nitrate, 2-5 parts of potassium nitrate, 3-5 parts of urea, 9.5-10.5 parts of water, 5-7 parts of composite oil phase, 2-3 parts of emulsifier, 2-5 parts of diatomaceous earth, and 6-10 parts of glass microspheres.

[0008] Furthermore, the composite oil phase includes at least two of liquid paraffin, petrolatum, silicone oil, chlorinated paraffin, engine oil, and diesel oil.

[0009] Furthermore, the composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of (4-6):(1-2):(6-10).

[0010] Further, the emulsifier comprises polyisobutylene succinimide and modified dehydrated sorbitan monooleate in a weight ratio of (10-12):(1-1.2).

[0011] Furthermore, the preparation method of the modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture containing citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 35-45 minutes, slowly adjusting the vacuum, and when the system temperature rises to 110-130℃, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 110-130℃ for 60-80 minutes.

[0012] Further, the mass ratio of citric acid, acetic acid and sorbitan monooleate is (0.8-1.2):(14-16):(1.5-2.5).

[0013] Furthermore, the polyisobutylene succinimide has an acid value of 8-9 mgKOH / g and a kinematic viscosity of 320-330 mm at 100°C. 2 / s, with a total nitrogen mass fraction of 0.9%-1%.

[0014] Furthermore, the bulk density of the glass microspheres is 0.20 g / cm³. 3 The average particle size is 50 μm.

[0015] On the other hand, the present invention also provides a process for producing an emulsion explosive composition, the steps of which include: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 100-105℃ to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 95-100℃, keep warm for 35-45min to obtain oil phase; (3) The aqueous phase is slowly added to the oil phase after heat preservation to obtain an emulsion matrix, which is then naturally cooled to 50-60℃; then diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0016] Furthermore, the process of slowly adding the aqueous phase to the insulated oil phase needs to be carried out under stirring conditions, with a stirring time of 20-30 minutes.

[0017] The beneficial effects of this invention are as follows: (1) In this invention, chlorinated paraffin, petrolatum and machine oil are used as the compound oil phase. Chlorinated paraffin, as an oil phase material in emulsion explosives, can enhance the strength of the oil film, help to encapsulate and stabilize the dispersed phase, reduce the demulsification phenomenon of emulsion explosives, and thus improve its stability. Petrolatum and machine oil, as common oil phase materials, have the characteristics of good matching with emulsifiers and can complement chlorinated paraffin, such as providing appropriate viscosity adjustment and forming an effective physical barrier, so that the emulsion explosives can maintain good stability under different temperature conditions. The compound use of the three can give full play to their respective advantages and form a synergistic effect, forming a more stable and uniform continuous phase in emulsion explosives, effectively encapsulating and protecting the dispersed phase, preventing the precipitation and crystallization of oxidants such as ammonium nitrate, and improving the storage stability of emulsion explosives.

[0018] (2) In this invention, polyisobutylene succinimide and modified sorbitan monooleate are used as compound emulsifiers. The three-dimensional framework structure and three-dimensional barrier film of polyisobutylene succinimide can prevent the precipitation of salt solutions such as ammonium nitrate from the oil phase solution, thereby greatly improving the storage stability of the emulsion explosive. In addition, the network molecular structure of polyisobutylene succinimide gives the emulsion explosive good anti-vibration and shock resistance, making it less susceptible to damage during transportation and storage. The sorbitan monooleate modified with citric acid not only has excellent emulsifying and dispersing properties, but also enhances the consistency and dispersibility of the emulsion, while also increasing its antioxidant properties, which helps to extend the service life and storage stability of the emulsion explosive. The combination of the two can form a more stable emulsion system, reduce the demulsification phenomenon of the emulsion explosive, and jointly improve the stability of the emulsion explosive.

[0019] (3) This invention utilizes a compound of diatomaceous earth and glass microspheres as a diluent for emulsion explosives, effectively controlling the performance of the explosives. The unique hollow structure and high porosity of the glass microspheres allow them to play multiple roles in the emulsion explosives. This structure not only significantly reduces the energy density of the emulsion explosives, thereby reducing potential hazards, but also acts as a physical sensitizer, effectively promoting the reaction process of the explosives and improving their explosive performance. Meanwhile, diatomaceous earth, as another inert additive, complements the glass microspheres. Diatomaceous earth not only absorbs the energy of the detonation wave, effectively mitigating the shock wave generated by the explosion, but also hinders the propagation of the detonation wave to a certain extent, further enhancing the safety of the explosives. During the production of emulsion explosives, the addition of glass microspheres and diatomaceous earth makes the production of the explosives safer and more controllable. During storage, these two additives maintain the stability of the explosives' performance, preventing performance degradation or failure due to changes in storage conditions. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that the raw materials are all commercially available.

[0021] It should also be noted that the performance values ​​of polyisobutylene succinimide in the examples and comparative examples are as follows: acid value was tested according to standard GB / T 28111-2011, kinematic viscosity at 100°C was tested according to standard GB / T 265-88, and total nitrogen mass fraction was tested according to standard SH / T 0224-1992.

[0022] Example 1 This embodiment provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; The acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0023] The production process of the emulsion explosive composition in this embodiment includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0024] Example 2 This embodiment provides an emulsion explosive composition comprising the following materials in parts by weight: 64 parts porous granular ammonium nitrate, 8.5 parts sodium nitrate, 2 parts potassium nitrate, 3 parts urea, 9.5 parts water, 5 parts composite oil phase, 2 parts emulsifier, 2 parts diatomaceous earth, and 6 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 4:1:6; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating to allow acetic acid to fully reflux for 35 minutes, slowly adjusting the vacuum, and when the system temperature rises to 110℃, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 110℃ for 60 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 0.8:14:1.5; The acid value of polyisobutylene succinimide is 8 mgKOH / g, and its kinematic viscosity at 100℃ is 320 mm. 2 / s, with a total nitrogen mass fraction of 0.9%.

[0025] The production process of the emulsion explosive composition in this embodiment includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 100°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 95°C, keep warm for 35 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 20 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 50°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0026] Example 3 This embodiment provides an emulsion explosive composition comprising the following materials in parts by weight: 70 parts porous granular ammonium nitrate, 9.5 parts sodium nitrate, 5 parts potassium nitrate, 5 parts urea, 10.5 parts water, 7 parts composite oil phase, 3 parts emulsifier, 5 parts diatomaceous earth, and 10 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 3:1:5; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture containing citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating to allow acetic acid to fully reflux for 45 minutes, slowly adjusting the vacuum, and when the system temperature rises to 130℃, at which point the acetic acid has evaporated completely, continuing to maintain the system temperature at 130℃ for 60-80 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1.2:16:2.5; The acid value of polyisobutylene succinimide is 9 mgKOH / g, and its kinematic viscosity at 100℃ is 330 mm. 2 / s, with a total nitrogen mass fraction of 1%.

[0027] The production process of the emulsion explosive composition in this embodiment includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 105°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 100℃, keep warm for 45min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 30 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 60°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0028] Example 4 This embodiment provides an emulsion explosive composition comprising the following materials in parts by weight: 70 parts porous granular ammonium nitrate, 8.5 parts sodium nitrate, 5 parts potassium nitrate, 3 parts urea, 10.5 parts water, 5 parts composite oil phase, 3 parts emulsifier, 2 parts diatomaceous earth, and 10 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 6:1:6; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1.2; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 45 minutes, slowly adjusting the vacuum, and when the system temperature rises to 130℃, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 130℃ for 60 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 0.8:16:1.5; The acid value of polyisobutylene succinimide is 8 mg KOH / g, and its kinematic viscosity at 100℃ is 330 mm. 2 / s, with a total nitrogen mass fraction of 0.9%.

[0029] The production process of the emulsion explosive composition in this embodiment includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 100°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 95°C, keep warm for 45 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 30 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 50°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0030] Comparative Example 1 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and silicone oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; The acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0031] The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0032] Comparative Example 2 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and diesel oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; The acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0033] The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0034] Comparative Example 3 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 1:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; The acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0035] The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0036] Comparative Example 4 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and sorbitan monooleate in a weight ratio of 10:1; The acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0037] The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0038] Comparative Example 5 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifier is polyisobutylene succinimide; the acid value of polyisobutylene succinimide is 8.5 mg KOH / g, and its kinematic viscosity at 100℃ is 325 mmHg. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0039] The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0040] Comparative Example 6 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifier is modified sorbitan monooleate; the preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture containing citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; The production process of the emulsion explosive composition in this comparative example includes the following steps: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 102°C to obtain the aqueous phase; (2) Stir and mix urea, composite oil phase and emulsifier evenly, heat to 97°C, keep warm for 40 min to obtain oil phase; (3) Under stirring conditions, the aqueous phase is slowly added to the oil phase after heat preservation and stirred for 25 minutes to obtain the emulsion matrix. The matrix is ​​then naturally cooled to 55°C. Then, diatomaceous earth and glass microspheres are added to the emulsion matrix and mixed evenly to obtain the final product.

[0041] Experimental Example 1: The performance of the emulsion explosive compositions prepared in Examples 1-4 and Comparative Examples 1-6 was investigated. The performance test results are shown in Table 1 below: Table 1

[0042] Comparative Example 7 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; Comparative Examples 7-1 and 7-2 were designed by adjusting the acid value of polyisobutylene succinimide respectively: The acid value of polyisobutylene succinimide in Comparative Example 7-1 was 7 mg KOH / g; its kinematic viscosity at 100℃ was 325 mm. 2 / s, with a total nitrogen mass fraction of 0.95%; The acid value of polyisobutylene succinimide in Comparative Example 7-2 was 10 mg KOH / g; its kinematic viscosity at 100℃ was 325 mm. 2 / s, with a total nitrogen mass fraction of 0.95%.

[0043] The production process of the emulsion explosive composition in this comparative example is the same as that in Example 1.

[0044] Comparative Example 8 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; Comparative Examples 8-1 and 8-2 were designed by adjusting the kinematic viscosity of polyisobutylene succinimide at 100°C respectively. The kinematic viscosity of polyisobutylene succinimide in Comparative Example 8-1 at 100°C was 310 mm. 2 / s, acid value 8.5mgKOH / g, total nitrogen mass fraction 0.95%; The kinematic viscosity of polyisobutylene succinimide in Comparative Example 8-2 at 100°C was 340 mm. 2 / s, acid value 8.5mgKOH / g, total nitrogen mass fraction 0.95%.

[0045] The production process of the emulsion explosive composition in this comparative example is the same as that in Example 1.

[0046] Comparative Example 9 This comparative example provides an emulsion explosive composition comprising the following materials in parts by weight: 67 parts porous granular ammonium nitrate, 9 parts sodium nitrate, 3.5 parts potassium nitrate, 4 parts urea, 10 parts water, 6 parts composite oil phase, 2.5 parts emulsifier, 3.5 parts diatomaceous earth, and 8 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of 5:1.5:8; the glass microspheres have a bulk density of 0.20 g / cm³. 3 The average particle size is 50 μm; The emulsifiers include polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of 10:1; The preparation method of modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture of citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating the system to allow the acetic acid to fully reflux for 40 minutes, slowly adjusting the vacuum, and when the system temperature rises to 120°C, at which point the acetic acid has evaporated completely, and continuing to maintain the system temperature at 120°C for 70 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is 1:15:2; Comparative Examples 9-1 and 9-2 were designed by adjusting the total nitrogen mass fraction of polyisobutylene succinimide respectively: The total nitrogen mass fraction of polyisobutylene succinimide in Comparative Example 9-1 was 0.8%; the acid value was 8.5 mg KOH / g; and the kinematic viscosity at 100℃ was 325 mmHg. 2 / s; The total nitrogen mass fraction of polyisobutylene succinimide in Comparative Example 9-2 was 1.2%; the acid value was 8.5 mg KOH / g; and the kinematic viscosity at 100℃ was 325 mmHg. 2 / s.

[0047] The performance of the emulsion explosive compositions obtained in Comparative Examples 7-9 was investigated, and the performance test results are shown in Table 2 below: Table 2

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An emulsion explosive composition, characterized in that, It contains the following materials in parts by weight: 64-70 parts porous granular ammonium nitrate, 8.5-9.5 parts sodium nitrate, 2-5 parts potassium nitrate, 3-5 parts urea, 9.5-10.5 parts water, 5-7 parts composite oil phase, 2-3 parts emulsifier, 2-5 parts diatomaceous earth, and 6-10 parts glass microspheres. The composite oil phase comprises chlorinated paraffin, petrolatum, and engine oil in a weight ratio of (4-6):(1-2):(6-10); the emulsifier comprises polyisobutylene succinimide and modified sorbitan monooleate in a weight ratio of (10-12):(1-1.2). The preparation method of the modified sorbitan monooleate includes: fully dissolving citric acid in glacial acetic acid, then pouring the sorbitan monooleate into a mixture containing citric acid and glacial acetic acid, stirring and heating; the initial pressure is atmospheric pressure, then slightly evacuating to allow acetic acid to fully reflux for 35-45 minutes, slowly adjusting the vacuum, and when the system temperature rises to 110-130℃, at which point the acetic acid is completely evaporated, and continuing to maintain the system temperature at 110-130℃ for 60-80 minutes; the mass ratio of citric acid, acetic acid and sorbitan monooleate is (0.8-1.2):(14-16):(1.5-2.5).

2. The emulsion explosive composition according to claim 1, characterized in that, The polyisobutylene succinimide has an acid value of 8-9 mgKOH / g, a kinematic viscosity of 320-330 mm² / s at 100℃, and a total nitrogen mass fraction of 0.9%-1%.

3. The emulsion explosive composition according to claim 1, characterized in that, The glass microspheres have a bulk density of 0.20 g / cm³ and an average particle size of 50 μm.

4. A production process for an emulsion explosive composition as described in any one of claims 1-3, characterized in that the steps include... include: (1) Weigh the raw materials as required, mix the porous granular ammonium nitrate, sodium nitrate, potassium nitrate and water evenly, heat to 100-105℃ to obtain the aqueous phase; (2) Stir and mix the urea, composite oil phase and emulsifier evenly, heat to 95-100℃, keep warm for 35-45min to obtain the oil phase; (3) Slowly add the aqueous phase to the oil phase after keeping warm to obtain the emulsion matrix, and cool naturally to 50-60℃; then add diatomaceous earth and glass microspheres to the emulsion matrix, mix evenly, and obtain the final product.

5. The production process of the emulsion explosive composition according to claim 4, characterized in that, The process of slowly adding the aqueous phase to the insulated oil phase needs to be carried out under stirring conditions, and the stirring time is 20-30 minutes.

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