A non-sensitive initiator transducer element structure

Abstract

The present invention discloses a non-sensitive initiator transducer element structure, which includes a PCB circuit board; a metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; the composition of the ignition bridge film includes a conductive polymer, a high-temperature foaming agent azodicarbonamide, and solid particles with a high thermal conductivity coefficient; the ignition bridge film is prepared by a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and solid particles with a high thermal conductivity coefficient. The prepared initiator transducer element structure does not contain any sensitive initiator agents, and only burns but does not explode when heated by an open flame, with high safety; and since this initiator transducer element structure belongs to a non-sensitive initiator, the costs in the production, storage, and transportation processes are low.

Description

Technical Field

[0001] The present invention relates to the technical field of transducer elements, and specifically to a non-sensitive initiator transducer element structure. Background Art

[0002] The conductive bridges in commercially available transducer elements are metal bridge wires, bridge tapes, and semiconductor bridges. Among them, the metal bridge wires and bridge tapes must cooperate with sensitive initiator agents to achieve low-voltage pulse ignition, while the semiconductor bridge realizes detonator ignition through the plasma electro-explosion process under the action of a pulsed voltage, but the ignition voltage is usually greater than 40V. To reduce the ignition voltage, the semiconductor bridge must also be supplemented with an energetic sensitive initiator agent, and the ignition voltage is reduced by means of the energy amplification of the energetic gunpowder.

[0003] Since the transducer element of the current electronic detonator ignition device is a metal bridge wire or bridge tape, the outside is dipped and wrapped with ignition powder. The exposed ignition powder in this structure is sensitive to friction, static electricity, and collision, which may cause misfiring and pose a safety hazard; in addition, under the action of external forces such as shock waves and vibrations, the exposed ignition powder can be pulverized and fall off, resulting in ignition failure.

[0004] Therefore, there is currently a lack of an initiator transducer element material that does not contain any sensitive initiator agents and can achieve low-voltage ignition at the same time; therefore, a non-sensitive initiator transducer element structure is proposed for the above problems. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and achieve the above effects, the present invention proposes a non-sensitive initiator transducer element structure.

[0006] A non-sensitive initiator transducer element structure includes a PCB circuit board; a metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; the composition of the ignition bridge film includes a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and high-thermal-conductivity solid particles.

[0007] The ignition process of the ignition bridge film is as follows: The pulsed current flows through the thin film bridge transducer element, quickly converts electrical energy into heat energy and generates high temperature, and at the same time heats the foaming agent ADC and the high-thermal-conductivity solid particles wrapped therein. When ADC is heated to above 200°C, it quickly decomposes and gasifies and expands, pushing out the high-thermal-conductivity solid particles that have been heated to a high temperature. The ejected high-temperature solid particles contact the detonator primer to detonate the detonator.

[0008] Preferably, the preparation method of the initiator transducer element structure includes the following steps:

[0009] Step S1: The high-temperature foaming agent azodicarbonamide is refined and uniformly dispersed in the conductive polymer solution by shear dispersion methods such as ultrasonic and high-pressure homogenization to obtain a conductive polymer / ADC dispersion liquid;

[0010] Step S2: Add solid particles with a high thermal conductivity coefficient to the conductive polymer / ADC dispersion obtained in Step S1, and mix them by high-speed mechanical stirring to obtain a uniform conductive polymer / ADC / high thermal conductivity solid dispersion;

[0011] Step S3: Shield the prefabricated PCB board with metal electrodes using high-temperature tape, leaving the metal electrodes and the electrode gap part exposed;

[0012] Step S4: Apply the conductive polymer / ADC / high thermal conductivity solid dispersion obtained in Step S2 onto the surface of the PCB circuit board shielded in Step S3 by methods such as dispensing, spraying, and scraping;

[0013] Step S5: Remove the high-temperature shielding tape to obtain the ignition bridge film and the transducer element structure.

[0014] Preferably, in Step S1, the dosage of the conductive polymer is 85-95% wt, the mesh number of ADC is above 1500 mesh, and the dosage is 3-10% wt.

[0015] Preferably, in Step S2, the overall solid content of the conductive polymer / ADC / high thermal conductivity solid dispersion is 0.06-0.1% wt.

[0016] Preferably, in Step S4, the coating method includes one of dispensing, spraying, and scraping, and the coating amount is 2-10 μL / cm 2 And heat and dry.

[0017] Preferably, the solid particles with a high thermal conductivity coefficient include one or more of diamond powder, titanium powder, boron nitride powder, and corundum powder, the mesh number is above 600 mesh, and the dosage is 2%-5%.

[0018] The beneficial effects of the present invention are as follows:

[0019] The present invention prepares the ignition bridge film through a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and solid particles with a high thermal conductivity coefficient. The prepared transducer element structure of the initiator does not contain any sensitive initiator agents, and only burns but does not explode under open flame heating, with high safety; and since the transducer element structure of the initiator belongs to a non-sensitive initiator, the costs in the production, storage, and transportation processes are low. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Flow chart of the preparation method of an embodiment of the present invention;

[0022] Figure 2 Schematic side sectional view of the initiator transducer element structure in an embodiment of the present invention;

[0023] Figure 3 Top view schematic of the initiator transducer element structure in an embodiment of the present invention;

[0024] Figure 4 Physical photo of the initiator transducer element prepared in an embodiment of the present invention;

[0025] Figure 5 Photo of the firing process of the initiator transducer element prepared in an embodiment of the present invention;

[0026] In the figure: 11, ignition bridge film; 12, metal electrode; 13, PCB circuit board. Specific embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1:

[0029] Please refer to Figures 1 - 5 As shown, a non-sensitive initiator transducer element structure includes a PCB circuit board; a metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; the composition of the ignition bridge film includes a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and high-thermal-conductivity solid particles.

[0030] As an implementation manner of the present invention, the preparation method of the initiator transducer element structure includes the following steps:

[0031] Step S1: The high-temperature foaming agent azodicarbonamide is finely and uniformly dispersed in the conductive polymer solution by shear dispersion methods such as ultrasonic and high-pressure homogenization to obtain a conductive polymer / ADC dispersion;

[0032] Step S2: High-thermal-conductivity solid particles are added to the conductive polymer / ADC dispersion obtained in Step S1, and uniformly mixed by high-speed mechanical stirring to obtain a uniform conductive polymer / ADC / high-thermal-conductivity solid dispersion;

[0033] Step S3: Shield the prefabricated PCB board with metal electrodes using high-temperature tape, leaving the metal electrodes and the electrode gap exposed;

[0034] Step S4: Coat the surface of the PCB circuit board shielded in Step S3 with the conductive polymer / ADC / high thermal conductivity solid dispersion obtained in Step S2 by methods such as dispensing, spraying, or scraping;

[0035] Step S5: Remove the high-temperature shielding tape to obtain the ignition bridge film and the transducer element structure.

[0036] As an embodiment of the present invention, in Step S1, the dosage of the conductive polymer is 85% wt, the mesh number of ADC is 1500 mesh, and the dosage is 3% wt.

[0037] As an embodiment of the present invention, in Step S2, the total solid content of the conductive polymer / ADC / high thermal conductivity solid dispersion is 0.06% wt.

[0038] As an embodiment of the present invention, in Step S4, the coating method includes one of dispensing, spraying, and scraping, and the coating amount is 2 μL / cm 2 and heat it for drying.

[0039] As an embodiment of the present invention, the high thermal conductivity solid particles include one or more of diamond powder, titanium powder, boron nitride powder, and corundum powder, with a mesh number of 600 mesh and a dosage of 2%.

[0040] Example Two:

[0041] A non-sensitive initiator transducer element structure includes a PCB circuit board; a metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; the composition of the ignition bridge film includes a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and high thermal conductivity solid particles.

[0042] As an embodiment of the present invention, the preparation method of the initiator transducer element structure includes the following steps:

[0043] Step S1: Through shear dispersion methods such as ultrasonic and high-pressure homogenization, the high-temperature foaming agent azodicarbonamide is refined and uniformly dispersed in the conductive polymer solution to obtain a conductive polymer / ADC dispersion;

[0044] Step S2: Add high thermal conductivity solid particles to the conductive polymer / ADC dispersion obtained in Step S1, and mix them evenly by high-speed mechanical stirring to obtain a uniform conductive polymer / ADC / high thermal conductivity solid dispersion;

[0045] Step S3: Shield the prefabricated PCB board with metal electrodes using high-temperature tape, leaving the metal electrodes and the electrode gap part exposed;

[0046] Step S4: Coat the surface of the PCB circuit board shielded in Step S3 with the conductive polymer / ADC / high thermal conductivity solid dispersion obtained in Step S2 by methods such as dispensing, spraying, or blade coating;

[0047] Step S5: Remove the high-temperature shielding tape to obtain the ignition bridge film and the transducer element structure.

[0048] As an embodiment of the present invention, in Step S1, the amount of the conductive polymer is 90% wt, the mesh number of ADC is 2000 mesh, and the amount is 6% wt.

[0049] As an embodiment of the present invention, in Step S2, the total solid content of the conductive polymer / ADC / high thermal conductivity solid dispersion is 0.08% wt.

[0050] As an embodiment of the present invention, in Step S4, the coating method includes one of dispensing, spraying, and blade coating, and the coating amount is 8 μL / cm 2 and heat it for drying.

[0051] As an embodiment of the present invention, the high thermal conductivity solid particles include one or more of diamond powder, titanium powder, boron nitride powder, and corundum powder. The mesh number of the corundum powder is 800 mesh, and the amount is 4%.

[0052] Example 3:

[0053] A non-sensitive initiator transducer element structure includes a PCB circuit board; a metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; the composition of the ignition bridge film includes a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and high thermal conductivity solid particles.

[0054] As an embodiment of the present invention, the preparation method of the initiator transducer element structure includes the following steps:

[0055] Step S1: Refine and uniformly disperse the high-temperature foaming agent azodicarbonamide in the conductive polymer solution by shear dispersion methods such as ultrasonic and high-pressure homogenization to obtain a conductive polymer / ADC dispersion;

[0056] Step S2: Add high thermal conductivity solid particles to the conductive polymer / ADC dispersion obtained in Step S1, and mix them uniformly by high-speed mechanical stirring to obtain a uniform conductive polymer / ADC / high thermal conductivity solid dispersion;

[0057] Step S3: Shield the prefabricated PCB board with metal electrodes using high-temperature tape, leaving the metal electrodes and the electrode gap part exposed;

[0058] Step S4: Apply the conductive polymer / ADC / highly thermally conductive solid dispersion obtained in Step S2 onto the surface of the PCB circuit board shielded in Step S3 by methods such as dispensing, spraying, and scraping;

[0059] Step S5: Remove the high-temperature shielding tape to obtain the ignition bridge film and the transducer element structure.

[0060] As an embodiment of the present invention, in Step S1, the dosage of the conductive polymer is 95% wt, the mesh number of ADC is 2500 mesh, and the dosage is 10% wt.

[0061] As an embodiment of the present invention, in Step S2, the overall solid content of the conductive polymer / ADC / highly thermally conductive solid dispersion is 0.1% wt.

[0062] As an embodiment of the present invention, in Step S4, the coating method includes one of dispensing, spraying, and scraping, and the coating amount is 10 μL / cm 2 And heat and dry.

[0063] As an embodiment of the present invention, the highly thermally conductive solid particles include one or more of diamond powder, titanium powder, boron nitride powder, and corundum powder, with a mesh number of 1000 mesh and a dosage of 5%.

[0064] Specifically, the ignition principle of this initiator transducer element structure is as follows: The pulsed current flows through the thin-film bridge transducer element, quickly converting electrical energy into heat energy and generating high temperature. At the same time, it heats the foaming agent ADC and the highly thermally conductive solid particles wrapped therein. When ADC is heated to above 200°C, it rapidly decomposes, gasifies, and expands, pushing out the highly thermally conductive solid particles that have been heated to high temperature. The ejected high-temperature solid particles contact the detonator priming charge to detonate the detonator. This initiator transducer element structure does not contain any sensitive initiator agents, and it only burns but does not explode when heated by an open flame, with high safety; and it is a non-sensitive initiator, and the production, storage, and transportation costs are low.

[0065] In the description of this specification, the description referring to terms such as "an embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0066] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A non-sensitive initiator transducer element structure, characterized in that: It includes a PCB circuit board; A metal electrode is deposited on the top of the PCB circuit board; an ignition bridge film is coated on the surface of the metal electrode; The composition of the ignition bridge film includes a conductive polymer solution, a high-temperature foaming agent azodicarbonamide, and high-thermal-conductivity solid particles; The pulsed current flows through the ignition bridge film, quickly converts electrical energy into heat energy and generates high temperature. At the same time, it heats the high-temperature foaming agent azodicarbonamide and high-thermal-conductivity solid particles wrapped therein. The high-temperature foaming agent azodicarbonamide is heated to above 200 °C and rapidly decomposes and gasifies and expands, pushing out the high-thermal-conductivity solid particles that have been heated to a high temperature. The ejected high-thermal-conductivity solid particles contact the detonator priming explosive to detonate the detonator.

2. The non-sensitive initiator transducer element structure according to claim 1, characterized in that: The preparation method of the pyrotechnic transducer element structure includes the following steps: Step S1: By ultrasonic and high-pressure homogenization shearing dispersion methods, the high-temperature foaming agent azodicarbonamide is refined and uniformly dispersed in the conductive polymer solution to obtain a conductive polymer / high-temperature foaming agent azodicarbonamide dispersion; Step S2: Add high-thermal-conductivity solid particles to the conductive polymer / high-temperature foaming agent azodicarbonamide dispersion obtained in Step S1, and mix them evenly by high-speed mechanical stirring to obtain a uniform conductive polymer / high-temperature foaming agent azodicarbonamide / high-thermal-conductivity solid dispersion; Step S3: Shield the prefabricated PCB board with metal electrodes with high-temperature tape, leaving the metal electrodes and the electrode gap part exposed; Step S4: Coat the conductive polymer / high-temperature foaming agent azodicarbonamide / high-thermal-conductivity solid dispersion obtained in Step S2 on the surface of the PCB circuit board that has been shielded in Step S3 by methods such as dispensing, spraying, and scraping; Step S5: Remove the high-temperature shielding tape to obtain the ignition bridge film and the transducer element structure.

3. The non-sensitive initiator transducer element structure according to claim 2, characterized in that: In the said Step S1, the dosage of the conductive polymer is 85-95%wt, the mesh number of the high-temperature foaming agent azodicarbonamide is above 1500 mesh, and the dosage is 3-10%wt.

4. The non-sensitive initiator transducer element structure according to claim 3, characterized in that: In the step S4, the coating method includes one of dispensing, spraying, and blade coating, and the coating amount is 2-10 μL / cm 2 and then dried by heating.

5. The non-sensitive initiator transducer element structure according to claim 4, characterized in that: The high-thermal-conductivity solid particles include one or several of diamond powder, titanium powder, boron nitride powder, and corundum powder, the mesh number is above 600 mesh, and the dosage is 2%-5%.

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