JPH04198081A - Non-gelatinous water-containing explosive composition - Google Patents

Abstract

PURPOSE:To obtain a water-containing explosive composition resistant to separation of liquid, having tough and hard nature and exhibiting stable explosive performance by making a component composed of a desensitizer, an oxygen- supplying agent and water adsorbed and held on the surface of small foamed particles or between the particles. CONSTITUTION:The objective non-gelatinous water-containing explosive composition is produced by making a component composed of a desensitizer, an oxygen- supplying agent and water adsorbed and held on the surface of small foamed particles or between the particles. A vinylidene chloride-acrylonitrile copolymer is especially suitable as a material for the small foamed particle to be used in the present composition to stably keep excellent detonation over a long period. The desensitizing agent is e.g. alkylamine nitrate such as monomethylamine nitrate or monoethylamine nitrate or hydrazine nitrate, etc. The oxygen-supplying agent is e.g. ammonium, alkali metal or alkaline-earth metal salt, etc., of an inorganic acid such as nitric acid or chloric acid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-gel hydrous explosive composition for industrial use. The present invention relates to a high-quality non-gel hydrous explosive composition with improved handling properties and storage stability.

[Conventional technology]

Traditionally, hydrous explosives include guar gum, polyacrylamide,
The homogeneity of the composition is maintained by adding a hydratable thickener such as starch to thicken it. For example, JP-A-55-47299 discloses a method using a mixed thickener consisting of an unmodified or hydroxylalkyl guar gum derivative and a guar gum derivative containing a carboxyl group, or locust bean gum or a derivative thereof;
Japanese Patent Publication No. 55-10413 describes guar gum, locust bean gum or derivatives thereof, xanthan gum,
A method using one or a combination of two or more of natural or synthetic polymeric compounds such as polyacrylamide has been disclosed.

[Problem to be solved by the invention]

However, hydrous explosives containing these thickeners have the following problems.

Namely, hydrous explosives using a mixed thickener consisting of an unmodified or hydroxylalkyl guar gum derivative and a guar gum derivative containing a carboxyl group, or locust bean gum or a derivative thereof, hydrous explosives using a combination of guar gum, etc. and starch, and polyacrylamide. Hydrous explosives that use polyacrylamide or a combination of polyacrylamide, guar gum, etc. as thickeners have gel elasticity unique to hydrous explosives, so when they are made into explosive cartridges, they tend to be limp and limp, making them difficult to handle. Since it was difficult to push the cartridge into the blast hole, there were problems such as a decrease in blasting efficiency. In addition, after a certain period of time has passed after manufacturing this hydrous explosive composition, the gel deteriorates and water in the explosive separates, causing a liquid separation phenomenon, which not only makes the cartridge even more limp and difficult to handle, but also causes the separated liquid to become difficult to handle. seeps out from the micropores and adheres to the outside of the drug package,
There was a problem in that hands became sticky when handling medicine packages.

Accordingly, an object of the present invention is to provide a non-gel hydrous explosive composition that suppresses liquid separation, has firm and hard drug properties, and exhibits stable explosive performance.

[Means to solve the problem]

The inventors have completed the present invention as a result of intensive research to obtain a non-gel hydrous explosive composition free from the above-mentioned problems.

That is, the present invention provides a non-gel hydrous explosive composition that maintains the homogeneity of the composition by adsorbing and retaining components consisting of a sensitizing agent, an oxygen supplying agent, and water on the particle surface and/or between the particles of a microfoam. It is.

The microfoams used in the present invention include, for example, inorganic foams obtained from glass, shirasu, alumina, sodium silicate, nacre, obsidian, etc., phenolic resins, epoxy resins, urea resins, polyvinylidene chloride, chloride, etc. There are Yoiki foams obtained from vinylidene chloride copolymers such as vinylidene-acrylonitrile copolymer, vinylidene chloride-methyl methacrylate copolymer, and vinyl polymers such as polystyrene, polymethyl methacrylate, and polyvinyl chloride. . In particular, vinylidene chloride-acrylonitrile copolymer (for example, Expancel, a trade name manufactured by Kemanode) is a suitable microfoam that maintains a stable and good detonation rate over a long period of time.

The sensitizing agent used in the present invention includes alkyl nitrates such as monomethylamine nitrate and monoethylamine nitrate, hydrazine nitrate, and ethylene glycol mononitrate. Nitric acid esters and paint-grade aluminum can also be used as auxiliary sensitizers. Further, as the oxygen supplying agent, there are salts of inorganic acids such as nitric acid, chloric acid, and perchloric acid, such as ammonium, alkali metal, and alkaline earth metal, which may be used alone or in combination. In order to further improve the explosive power, solid combustibles such as coal powder and aluminum powder or liquid combustibles such as ethylene glycol may be added (this suppresses crystallization of component salts and stabilizes performance over a long period of time). There is no problem in adding a surfactant such as a phosphate ester or a decomposition inhibitor such as urea.

The method for producing the non-gel hydrous explosive composition of the present invention includes, for example,
A salt solution prepared by mixing specified amounts of each of monomethylamine nitrate, water, ammonium nitrate, and sodium nitrate with the required amount of surfactant and decomposition inhibitor is heated and mixed to dissolve a large amount of salt solids. In this method, this salt solution is added to the microfoam and the required amount of combustible material and mixed uniformly.

〔Example〕

Next, the present invention will be explained based on examples. The hardness of the drug, liquid separation, and naked detonation speed of the explosive composition were measured by the following methods.

(Measurement of medicinal hardness) Cut both ends of the above explosive cartridge to prepare samples from the five drug chiefs. A ball-shaped adapter at the tip of a rheometer (manufactured by Fudo Kogyo Co., Ltd., model: NRM-2002J) was inserted into this sample at an insertion speed of 6 ccn/min, and the value at this time was measured to determine the hardness of the drug. did.

(Measurement of liquid separation) The sample from which the polyethylene laminate paper tube was removed was
mf separatory funnel, and a heating cycle of 7 hours at 40°C and 17 hours at room temperature (20-25°C) was applied to the separating funnel, and the number of heating cycles at which liquid separation occurred was measured.

(Measurement of bare detonation velocity) A polyethylene laminate paper cylinder (drug diameter: 30-1, length: 300 mm) was packed tightly in advance and detonated with a No. 6 detonator, and the detonation velocity was measured by the ion gap method. For evaluation over time, additional measurements were taken 1 year after production.

Examples 1 to 5 Monomethylamine nitrate, water, ammonium nitrate and sodium nitrate were added to the first
The mixture was mixed as shown in the table and heated to 50-70°C to obtain a highly concentrated salt solution. Next, the above-mentioned high concentration salt solution was added to the microfoams in the amount shown in Table 1 and mixed uniformly to obtain a non-gel hydrous explosive composition.

The above non-gel hydrous explosive composition was prepared with a diameter of 30 m/m and a length of 1
A 50 m/m polyethylene laminate paper cylinder was tightly packed under a certain pressure, and both ends of the paper cylinder were sealed to form an explosive cartridge. Thereafter, it was stored in an atmosphere of 206C for 7 days.

After 7 days, the hardness, liquid separation, and detonation speed of the non-gel hydrous explosive composition were measured. The results are shown in Table 1.

Comparative Examples 1-2 A solution in which monomethylamine nitrate, water, ammonium nitrate, and foam were mixed as shown in Table 1 was heated to 30°C, and then a thickener and sodium nitrate were added in the amounts listed in Table 1. Then, a crosslinking agent, metal aluminum, and starch were added in the amounts listed in Table 1 and mixed uniformly to obtain a hydrous explosive composition.

The hydrous explosive composition had a diameter of 30 m/m and a length of 150 m.
After applying a certain pressure to tightly fill a polyethylene laminate paper tube with a diameter of 1.5 mm, both ends of the paper tube were sealed to prepare an explosive cartridge. Thereafter, it was stored in an atmosphere of 20°C for 7 days.

After 7 days, the hardness, liquid separation, and detonation speed of the hydrous explosive composition were measured. The results are shown in Table 1.

〔Effect of the invention〕

The non-gel hydrous explosive of the present invention, unlike conventional thickener-based hydrous explosives, exhibits good hard chemical properties without gel elasticity and stable detonation performance, and eliminates various conventional problems during use. It is.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] 1. A non-gel hydrous explosive composition characterized in that components consisting of a sensitizing agent, an oxygen supplying agent, and water are adsorbed and retained on the surface of microfoam particles and/or between the particles.