Single-component high-precision ignition powder head and preparation method thereof

Abstract

The invention relates to the technical field of civil explosives, and discloses a single-component high-precision ignition powder head and a preparation method thereof, and the ignition powder head is composed of the following raw materials in parts by weight: 100 parts of Stefan lead and 5-10 parts of an adhesive. The ignition powder head is obtained by firstly mixing Stefan lead and an adhesive to prepare a product A, then dipping powder to prepare a semi-finished product, and then dipping paint to prepare the ignition powder head. The ignition head prepared by the invention has extremely high ignition precision, breaks through the barrier of the current ignition head, reaches us-level ignition precision, has the minimum range of 60 us, and has extremely high popularization and application values.

Description

Technical Field

[0001] The present invention relates to the technical field of civil explosives, and particularly relates to a single-component high-precision ignition cartridge and a preparation method thereof. Background Art

[0002] The statements in this section only provide background information related to the disclosure of the present application and may not constitute prior art.

[0003] With the development of modern industrial and military technologies, the performance requirements for ignition cartridges are getting higher and higher, especially in terms of high precision, high reliability, and fast response. Although improvements have been made to the ignition powder formula in the prior art, such as introducing composite ignition powder, and improvements have been made to the preparation process, such as introducing microfocus industrial CT imaging technology and other optimization methods; the improvement effect on ignition accuracy is limited, and most of the ignition accuracies remain at the ms level and cannot be further improved.

[0004] The prior art with the publication number CN111233590A discloses an electronic detonator ignition cartridge and a preparation method thereof, using lead thiocyanate and potassium chlorate as raw materials for the ignition powder, and polyvinyl butyral and absolute ethanol as binders to mix the electronic detonator ignition cartridge. The delay time is set at 150 ms, and the delay accuracy is 1 ms - 1.5 ms; it also remains at the ms stage.

[0005] The binder of the traditional lead styphnate ignition cartridge uses nitrocellulose, but nitrocellulose is highly flammable and explosive, posing a great threat to the inherent safety of the production process and the final product.

[0006] Therefore, there is still an urgent need to develop a safer high-precision ignition cartridge. Summary of the Invention

[0007] The purpose of the present invention is to: aiming at the problem of limited safety of the current ignition cartridge, provide a single-component high-precision ignition cartridge and a preparation method thereof. While using a safer binder, unexpected technical effects are also produced, significantly improving the ignition accuracy of the lead styphnate ignition cartridge, increasing the ignition accuracy by at least one order of magnitude, and making the ignition accuracy reach the μs level.

[0008] The technical solution of the present invention is as follows:

[0009] On the one hand, the present invention provides a single-component high-precision ignition cartridge, which is composed of the following raw materials in parts by weight: 100 parts, and 5 - 10 parts of a binder.

[0010] According to a preferred embodiment, the binder is a 5 - 10 wt% polyvinyl alcohol carboxybutyral alcohol solution.

[0011] According to a preferred embodiment, the grain size of the lead styphnate is less than or equal to 150 μm.

[0012] According to a preferred embodiment, the lead styphnate is a wet agent stored in alcohol.

[0013] According to a preferred embodiment, the polyvinyl butyral alcohol solution is polyvinyl butyral of 55s, 80s, and 110s. Preferably, it is polyvinyl butyral of 55s, which has low viscosity, is easy to form, is easy to stir, and has a very small difference in ignition time of the drug head.

[0014] On the other hand, the present invention provides a method for preparing a single-component high-precision ignition head, including the following steps:

[0015] Step (1), preparing Product A: Weigh the lead styphnate raw material and the binder according to the formula mass fraction, add the lead styphnate to the binder, and stir evenly to obtain Product A;

[0016] Preferably, step (1) specifically includes the following sub-steps:

[0017] Step (1.1): Pour out the alcohol that seals the lead styphnate;

[0018] Step (1.2): Weigh the lead styphnate raw material and the binder according to the said weight fraction;

[0019] Step (1.3): Add the lead styphnate to the binder to obtain Product A, and stir Product A for 4 - 6 hours until evenly stirred to obtain Product A.

[0020] Step (2), preparing a semi-finished ignition head: Apply the Product A prepared in step (1) to the lead wire; Apply the drug 2 - 4 times, preferably 3 times, and air-dry at room temperature after each application; After the drug application is completed, dry it at 40 - 50 °C to obtain a semi-finished ignition head;

[0021] Step (3), preparing the finished ignition head B: Apply paint to the semi-finished ignition head prepared in step (3), and dry it at 40 - 50 °C after the paint application is completed to obtain the finished ignition head B.

[0022] According to a preferred embodiment, the lead wire is an electronic detonator, a copper wire, or a nickel-chromium alloy wire.

[0023] According to a preferred embodiment, the paint for the paint application operation is nitro enamel, and the formula ratio is: red nitro enamel: white nitro enamel: banana oil = 4:1:(0 - 0.5).

[0024] According to a preferred embodiment, in step (2), dry for 24 - 48 h.

[0025] According to a preferred embodiment, in step (3), dry for 24 - 48 h.

[0026] According to a preferred embodiment, in step (2), the amount of the medicine contained in each semi-finished ignition charge head is 20-30 mg.

[0027] Compared with the existing technology, the beneficial effects of the present invention are as follows:

[0028] 1. For a single-component high-precision ignition charge head and its preparation method, lead styphnate uses a wet medicine, and the binder uses a polyvinyl alcohol carboxaldehyde solution, thereby preventing the possible combustion and explosion of nitrocellulose during use, and improving the intrinsic safety of the production process and the final product on the basis of a simple production process;

[0029] 2. For a single-component high-precision ignition charge head and its preparation method, on the basis of the beneficial effect in point 1, an unexpected technical effect is simultaneously produced, improving the ignition precision by at least one order of magnitude, so that the ignition precision reaches the microsecond level. Specific Embodiments

[0030] The specific embodiments listed in the present invention are only examples of the present invention, and the present invention is not limited to the specific embodiments described below. For those skilled in the art, any equivalent modifications and substitutions to the embodiments described below are also within the scope of the present invention. Therefore, equivalent transformations and modifications made without departing from the spirit and scope of the present invention should all be covered within the scope of the present invention. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. All reagents or instruments not specified by the manufacturer can be obtained through commercially available conventional products. In order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some specific details. In other embodiments, methods, means, equipment and steps well-known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. Without special instructions, the units used in this specification are all international standard units, and the numerical values and numerical ranges appearing in the present invention should be understood to include the inevitable systematic errors in industrial production.

[0032] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0033] Example 1 A single-component high-precision ignition charge head

[0034] It is prepared by the following method:

[0035] Step (1), prepare Product A: Weigh 100 parts of lead styphnate raw material with a grain size of less than 150 μm and 7 parts of binder (8% polyvinyl alcohol carboxybutyral alcohol) according to the formula mass fraction. Add lead styphnate to the binder and stir evenly to obtain Product A;

[0036] Specifically, it includes the following sub-steps:

[0037] Step (1.1): Pour out the alcohol that seals lead styphnate.

[0038] Step (1.2): Weigh 100 parts of lead styphnate raw material and 7 parts of binder according to the said weight fraction.

[0039] Step (1.3): Add lead styphnate to the binder to obtain Product A, and stir Product A for 4 - 6 hours until evenly stirred to obtain Product A.

[0040] Step (2), prepare the semi-finished ignition head: Dip the Product A prepared in step (1) onto the fuse; Dip the medicine 2 - 4 times, preferably 3 times, and dry it at room temperature after each dipping; After the dipping is completed, dry it at 40 - 50 °C to obtain the semi-finished ignition head;

[0041] Step (3), prepare the finished ignition head B: Dip the semi-finished ignition head prepared in step (3) with paint. The paint is nitro enamel, and the formula volume ratio is: red nitro enamel: white nitro enamel: banana water = 4:1:0.3. After the dipping is completed, dry it at 40 - 50 °C to obtain the finished ignition head B.

[0042] Example 2

[0043] This example uses the same preparation method as Example 1, the difference is the amount of binder used. In this example, the amount of binder used is 5 parts.

[0044] Example 3

[0045] This example uses the same preparation method as Example 1, the difference is the amount of binder used. In this example, the amount of binder used is 10 parts.

[0046] Two batches (50 rounds per batch) of ignition heads B were prepared respectively using the preparation method of Example 1 1 and B 2 , one batch (50 rounds per batch) of ignition heads B was prepared using the preparation method of Example 2 3 , one batch (50 rounds per batch) of ignition heads B was prepared using the preparation method of Example 3 4 , and the ignition time test was carried out. The results are as follows in the table:

[0047]

[0048] Example 4

[0049] This embodiment uses the same preparation method as Embodiment 1, the difference being that the grain size of the lead styphnate used is different. The lead styphnate used in this embodiment is 300 - 500 μm.

[0050] Embodiment 5

[0051] This embodiment uses the same preparation method as Embodiment 1, the difference being that the grain size of the lead styphnate used is different. The lead styphnate used in this embodiment is 150 - 300 μm.

[0052] The delay times and ranges of the ignition heads prepared in Embodiments 1, 4, and 5 are as follows in the table:

[0053]

[0054] As can be seen from the above table, for the ignition heads prepared in this application, when the grain size of the lead styphnate is less than 500 μm, the range of the delay time is less than 200 μs; the best result can achieve a range within 60 μs, which can meet the requirements of engineering blasting with high precision (such as seismic exploration, precision blasting, demolition blasting, etc.).

[0055] The above - described embodiments only represent the specific implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application.

Claims

1. A single-component high-precision ignition cartridge, characterized in that: The invention is composed of the following raw materials in parts by weight: 100 parts of lead styphnate and 5-10 parts of a binder.

2. A single-component high-precision ignition cartridge according to claim 1, characterized in that: The adhesive is a 5-10wt% polyvinyl alcohol carboxybutyraldehyde alcohol solution.

3. A single-component high-precision ignition cartridge according to claim 1, characterized in that: The grain size of the lead styphnate is less than or equal to 150 μm.

4. A single-component high-precision ignition charge according to claim 1, characterized in that: The lead styphnate is a wet agent stored in alcohol.

5. A method for preparing a single-component high-precision ignition charge as claimed in any one of claims 1 to 4, characterized in that: The steps include: Step (1), preparing product A: weighing lead styphnate raw material and binder according to the mass parts of the formula, adding lead styphnate to the binder, and stirring to obtain product A; Step (2), preparing a semi-finished ignition powder head: dip the product A prepared in step (1) onto the fuse; dip the product 2-4 times, and dry it at room temperature after each dip; after the dip is completed, dry it at 40-50°C to obtain a semi-finished ignition powder head; Step (3), preparing the ignition powder head finished product B: the ignition powder head semi-finished product prepared in step (3) is coated with paint, and after coating, it is dried at 40-50°C to obtain the ignition powder head finished product B.

6. The method for preparing a single-component high-precision ignition charge according to claim 5, characterized in that: The lead in step (2) is an electronic detonator, a copper wire or a nickel-chromium alloy wire.

7. The method for preparing a single-component high-precision ignition charge according to claim 5, characterized in that: The paint used in the painting operation is nitro lacquer, and the volume ratio of the formula is: red nitro lacquer: white nitro lacquer: banana water = 4:1:(0-0.5).

8. The method for preparing a single-component high-precision ignition charge according to claim 5, characterized in that: In step (2), drying is performed for 24-48 hours.

9. The method for preparing a single-component high-precision ignition charge according to claim 5, characterized in that: In step (3), drying is performed for 24-48 hours.

10. The method for preparing a single-component high-precision ignition charge according to claim 5, characterized in that: In step (2), the amount of ignition powder contained in each semi-finished ignition powder head is 20-30 mg.

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