Purple electric control pyrotechnic compound and preparation method thereof

Abstract

The invention belongs to the technical field of fireworks, and discloses a purple electric control pyrotechnic compound and a preparation method thereof. Lithium perchlorate and sodium perchlorate are adopted as oxidants of the pyrotechnic compound, and the pyrotechnic compound comprises the following components in percentage by mass: 20%-23% of lithium perchlorate, 20%-23% of sodium perchlorate, 20%-23% of water, 12%-13% of polyvinyl alcohol, 5%-10% of glycerol, 1%-2% of boric acid and 8%-10% of 100-mesh copper powder. The flame color of the prepared electric control pyrotechnic compound is purple, the electric control pyrotechnic compound has the advantages of being low in ignition delay time, reliable in secondary ignition performance and controllable in combustion speed in the combustion process, and the application problems that an existing pyrotechnic compound is uncontrollable in combustion, poor in safety and the like are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of pyrotechnics, and in particular relates to a purple electrically controlled pyrotechnic agent and a preparation method thereof. Background Art

[0002] Pyrotechnic agents refer to mixtures that produce pyrotechnic effects such as light, sound, smoke, color, heat and gas when burned. They are also called pyrotechnics or pyrotechnic agents. They are usually composed of oxidants, combustion aids, remixing agents and other additives. They are mostly explosives with very low explosive power. Their actual application is to utilize their combustion effect. At present, pyrotechnic agents are widely used in military, industrial, agricultural, transportation, transport and film production industries.

[0003] Pyrotechnic agents, especially civilian pyrotechnic agents used mainly for fireworks, usually show yellow, blue, red and other colors when burning, with a single color tone and a relatively fixed flame shape when burning. In recent years, fireworks manufacturers have also been looking for pyrotechnic agents with new colors and new flame shapes.

[0004] In addition, the combustion of existing pyrotechnic agents is uncontrollable and can only be ignited once. Once the pyrotechnic agent is ignited, it can only sustain combustion until the work is completed, which has a huge limitation on the safety of the use of pyrotechnic agents and the firing effect. Summary of the invention

[0005] The purpose of the present invention is to provide a purple electrically controlled pyrotechnic agent and a preparation method thereof, which solves the problem that the existing pyrotechnic agents have a single color and uncontrollable combustion.

[0006] The technical solution to achieve the purpose of the present invention is: a purple electrically controlled pyrotechnic agent, the components of which include lithium perchlorate, sodium perchlorate, polyvinyl alcohol, boric acid, glycerin, copper powder and water;

[0007] The total mass of the pyrotechnic agent is 100%, and the mass percentage content of each component is:

[0008] Lithium perchlorate: 20%-23%;

[0009] Sodium perchlorate: 20%-23%;

[0010] Polyvinyl alcohol: 12%-13%;

[0011] Boric acid: 1%-2%;

[0012] Glycerin: 7-9%.

[0013] Copper powder: 8%-10%;

[0014] Water: 20%-23%.

[0015] Furthermore, the model of polyvinyl alcohol is PVA124, the alcoholysis degree is 98%-99%, the melting point is greater than 300° C., and the average polymerization degree is 2400.

[0016] Furthermore, the copper powder is 100±10 mesh.

[0017] A method for preparing the above-mentioned purple electrically controlled pyrotechnic agent comprises the following steps:

[0018] 1) adding water to dissolve lithium perchlorate and sodium perchlorate to obtain a mixed aqueous solution;

[0019] 2) adding boric acid and glycerol to the mixed aqueous solution obtained in step 1) in sequence, stirring manually until all solids are completely dissolved in the mixed aqueous solution to obtain a viscous flowable liquid, and transferring the mixture to a stirring cup;

[0020] 3) vacuum stirring the viscous flowable liquid obtained in step 2) to obtain a uniform slurry;

[0021] 4) adding polyvinyl alcohol to the slurry obtained in step 3), stirring under vacuum to obtain a jelly-like slurry to be formed;

[0022] 5) adding copper powder to the slurry obtained in step 4), manually stirring until the copper powder is evenly distributed, and then vacuum stirring to obtain a jelly-like slurry;

[0023] 6) The jelly-like slurry obtained in step 5) is squeezed into a mold and dried to obtain a solidified pyrotechnic sample.

[0024] Furthermore, the vacuum stirring in step 3) is specifically: vacuum stirring at 25° C.-35° C. for 10±2 minutes.

[0025] Furthermore, in step 4), the mixture is stirred under vacuum for 5±1 minutes.

[0026] Furthermore, the vacuum stirring in step 5) is specifically: vacuum stirring at 45° C.-55° C. for 10±2 minutes.

[0027] Furthermore, the drying in step 6) is specifically carried out in a vacuum oven at 60±5° C. for 5±1 days.

[0028] Compared with the prior art, the present invention has the following significant advantages:

[0029] 1) The electrically controlled pyrotechnic agent of the present invention can present a purple flame through copper powder.

[0030] 2) The electrically controlled pyrotechnic agent of the present invention can be ignited and extinguished by turning the power on and off, and the combustion process can be controlled by the amount of applied electrical energy, thereby realizing active control of the combustion process of the pyrotechnic agent.

[0031] 3) Due to the electrically controllable characteristics of the formula disclosed in the present invention, the problem that the current pyrotechnic agent is easily ignited by external stimuli is substantially and effectively improved, thereby improving the safety of storage, transportation and use of pyrotechnic agents.

[0032] 4) The ignition performance of the electronically controlled pyrotechnic agent disclosed in the present invention is consistent, and the ignition performance of the pyrotechnic agent does not change significantly over time, which greatly improves the secondary ignition reliability of the pyrotechnic agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the CIE1931 pyrotechnic agent chromaticity diagram of Example 1 at room temperature and pressure.

[0034] Figure 2 This is the CIE1976 pyrotechnic agent chromaticity diagram of Example 1 at room temperature and pressure.

[0035] Figure 3 This is the CIE1931 pyrotechnic agent chromaticity diagram of Example 2 at room temperature and pressure.

[0036] Figure 4 This is the CIE1976 pyrotechnic agent chromaticity diagram of Example 2 at room temperature and pressure.

[0037] Figure 5 This is a sequence diagram of the combustion of the pyrotechnic agent when it is powered on and when it is powered off under a voltage of 200V according to Example 1 of the present invention.

[0038] Figure 6 This is a sequence diagram of the combustion of pyrotechnic agents when powered on and powered off at 250V in Example 2 of the present invention.

[0039] Figure 7 This is a diagram of the finished product morphology of pyrotechnic compositions. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with specific implementation methods, but the scope of protection is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope of the present invention should be covered within the scope of protection of the present invention.

[0041] Example 1

[0042] (1) A purple electrically controlled pyrotechnic agent and a preparation method thereof, wherein the formula components and their mass fractions are shown in Table 1.

[0043] Table 1 Example 1 Formula Components

[0044] Recipe ingredients Content (%wt) Lithium Perchlorate 21.85 Sodium Perchlorate 21.87 water 21.86 Polyvinyl alcohol (PVA) 15.50 glycerin 8.44 Boric acid 1.76 Copper powder 8.72

[0045] Weigh the raw materials according to the formula in Table 1;

[0046] Add water to lithium perchlorate and sodium perchlorate to dissolve to obtain a mixed aqueous solution, and stir until all solids are completely dissolved. Add boric acid and glycerol to the obtained mixed aqueous solution in turn, stir manually until all solids are completely dissolved in the above mixed aqueous solution, and obtain a viscous flowable liquid, which is transferred to a stirring cup. The obtained viscous liquid is vacuum stirred at 30°C for 10 minutes to obtain a uniform slurry. Add polyvinyl alcohol to the obtained slurry, vacuum stir for 5 minutes, and obtain a jelly-like slurry that is about to be formed. Add copper powder to the obtained slurry, stir manually until the copper powder is evenly distributed, and vacuum stir at 50°C for 10 minutes to obtain a jelly-like slurry. Extrude the obtained jelly-like slurry into a mold, place it in a vacuum oven set at 60°C for 5 days, and obtain a cured pyrotechnic sample.

[0047] (2) After experimental testing and theoretical calculation, the performance indicators of perchlorate-based electronically controlled pyrotechnics are as follows:

[0048] At normal temperature and pressure, the ignition delay time at 200V voltage is 21ms, and the secondary ignition is successful;

[0049] At normal temperature and pressure, the ignition delay time at 250V voltage is 22ms, and the secondary ignition is successful;

[0050] At normal temperature and pressure, the ignition delay time at 300V voltage is: 21ms, and the secondary ignition is successful.

[0051] The combustion sequence diagram of the pyrotechnic composition under the voltage of 220V is as follows: Figure 5 shown.

[0052] According to the experimental data, the chromaticity diagram of this embodiment is drawn ( Figure 1 , Figure 2 ), showing that the main color of the electronically controlled pyrotechnic powder flame is purple.

[0053] Example 2

[0054] (1) A purple electrically controlled pyrotechnic agent and a preparation method thereof, wherein the formula components and their mass fractions are shown in Table 2.

[0055] Table 2 Example 2 Formula Components

[0056] Recipe ingredients Content (%wt) Lithium Perchlorate 21.72 Sodium Perchlorate 21.86 water 8.66 Polyvinyl alcohol (PVA) 15.57 glycerin 21.66 Boric acid 8.91 Copper powder 1.62

[0057] Weigh the raw materials according to the formula in Table 2;

[0058] Add water to lithium perchlorate and sodium perchlorate to dissolve to obtain a mixed aqueous solution, and stir until all solids are completely dissolved. Add boric acid and glycerol to the obtained mixed aqueous solution in turn, stir manually until all solids are completely dissolved in the above mixed aqueous solution, and obtain a viscous flowable liquid, which is transferred to a stirring cup. The obtained viscous liquid is vacuum stirred at 30°C for 10 minutes to obtain a uniform slurry. Add polyvinyl alcohol to the obtained slurry, vacuum stir for 5 minutes, and obtain a jelly-like slurry that is about to be formed. Add copper powder to the obtained slurry, stir manually until the copper powder is evenly distributed, and vacuum stir at 50°C for 10 minutes to obtain a jelly-like slurry. Extrude the obtained jelly-like slurry into a mold, place it in a vacuum oven set at 60°C for 5 days, and obtain a cured pyrotechnic sample.

[0059] (2) After experimental testing and theoretical calculation, the performance indicators of perchlorate-based electronically controlled pyrotechnics are as follows:

[0060] At normal temperature and pressure, the ignition delay time at 200V voltage is 20ms, and the secondary ignition is successful;

[0061] At normal temperature and pressure, the ignition delay time at 250V voltage is 19ms, and the secondary ignition is successful;

[0062] At normal temperature and pressure, the ignition delay time at 300V voltage is: 19ms, and the secondary ignition is successful.

[0063] The combustion sequence diagram of the pyrotechnic composition under the voltage of 250V is as follows: Figure 6 shown.

[0064] According to the experimental data, the chromaticity diagram of this embodiment is drawn ( Figure 3 , Figure 4 ), showing that the main color of the electronically controlled pyrotechnic powder flame is purple.

[0065] As described above, according to the experimental test results and theoretical calculation data of each embodiment, 1) the ignition delay time of the electrically controlled solid propellant prepared according to the disclosed scheme of the present invention at a voltage of 200V is 19-22ms; 2) the flame color of the electrically controlled solid propellant prepared according to the disclosed scheme of the present invention at voltages of 200V and 250V is purple, and both can be ignited a second time, which proves that the ignition consistency of the propellant involved in the present invention is good, and confirms that the combustion of the electrically controlled pyrotechnic agent is controllable.

Claims

1. A purple electrically controlled pyrotechnic agent, characterized in that: The components of the electronically controlled pyrotechnic agent include lithium perchlorate, sodium perchlorate, polyvinyl alcohol, boric acid, glycerol, copper powder and water; The total mass of the pyrotechnic agent is 100%, and the mass percentage content of each component is: Lithium perchlorate: 20%-23%; Sodium perchlorate: 20%-23%; Polyvinyl alcohol: 12%-13%; Boric acid: 1%-2%; Glycerin: 7-9%. Copper powder: 8%-10%; Water: 20%-23%.

2. The purple electrically controlled pyrotechnic agent according to claim 1, characterized in that: The model of polyvinyl alcohol is PVA124, the alcoholysis degree is 98%-99%, the melting point is greater than 300°C, and the average polymerization degree is 2400.

3. The purple electrically controlled pyrotechnic agent according to claim 2, characterized in that: The copper powder is 100±10 mesh.

4. A method for preparing the purple electrically controlled pyrotechnic agent according to any one of claims 1 to 3, characterized in that: The steps include: 1) adding water to dissolve lithium perchlorate and sodium perchlorate to obtain a mixed aqueous solution; 2) adding boric acid and glycerol to the mixed aqueous solution obtained in step 1) in sequence, stirring manually until all solids are completely dissolved in the mixed aqueous solution to obtain a viscous flowable liquid, and transferring the mixture to a stirring cup; 3) vacuum stirring the viscous flowable liquid obtained in step 2) to obtain a uniform slurry; 4) adding polyvinyl alcohol to the slurry obtained in step 3), stirring under vacuum to obtain a jelly-like slurry to be formed; 5) adding copper powder to the slurry obtained in step 4), manually stirring until the copper powder is evenly distributed, and then vacuum stirring to obtain a jelly-like slurry; 6) The jelly-like slurry obtained in step 5) is squeezed into a mold and dried to obtain a solidified pyrotechnic sample.

5. The method according to claim 4, characterized in that The vacuum stirring in step 3) is specifically: vacuum stirring at 25°C-35°C for 10±2 minutes.

6. The method according to claim 5, characterized in that In step 4), the mixture is stirred under vacuum for 5±1 minutes.

7. The method according to claim 6, characterized in that The vacuum stirring in step 5) is specifically as follows: vacuum stirring at 45°C-55°C for 10±2 minutes.

8. The method according to claim 7, characterized in that The drying in step 6) is specifically: in a vacuum oven at 60±5°C for 5±1 days.

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