Red pyrotechnic compound capable of realizing electric control combustion and preparation method of red pyrotechnic compound

Abstract

The invention belongs to the technical field of pyrotechnic compounds, and particularly relates to a red pyrotechnic compound capable of realizing electric control combustion and a preparation method thereof. The red pyrotechnic compound comprises the following components in percentage by mass: 65-70% of hydroxylamine nitrate solution; 2-4% of ammonium nitrate; 10 to 12 percent of polyvinyl alcohol; 1-2% of borax; 15-18% of a strontium-based flame colorant; and 2 to 3 percent of pentaamino tetrazole. According to the pyrotechnic compound, ionic liquid hydroxylamine nitrate is adopted as a main oxidizing agent, under the action of electric energy, the ionic oxidizing agent is electrolyzed, ion migration occurs, the controllability of the pyrotechnic compound is guaranteed through the electrolytic reaction, controllable burning-out and adjustable burning speed can be achieved under the action of external electric energy, and higher safety and controllability are achieved; combustion products of the pyrotechnic compound are free of pollution, and the requirements of environmental protection on pyrotechnic products are met.

Description

Technical Field

[0001] The invention belongs to the technical field of pyrotechnic agents, and in particular relates to a red pyrotechnic agent capable of realizing electronically controlled combustion and a preparation method thereof. Background Art

[0002] Pyrotechnics are multi-component mechanical mixtures with oxidants, combustibles and adhesives as basic components. They can burn quickly and produce light, sound, smoke, heat and other effects when burning. Oxidants provide the oxygen needed for combustion; combustibles generate the required heat when the pyrotechnics burn; and adhesives give the pyrotechnic products a certain strength.

[0003] The safety of pyrotechnic agents has always been a difficult problem. Traditional pyrotechnic agents will burn or explode when exposed to open flames, high temperatures, impacts, friction and other unexpected stimuli, which will cause great safety hazards to the production, transportation and storage of pyrotechnic products. On the other hand, traditional pyrotechnic agents also have defects in achieving complex pyrotechnic effects due to the uncontrollable combustion. Summary of the invention

[0004] The purpose of the present invention is to provide a red pyrotechnic agent capable of electrically controlled combustion and a preparation method thereof. The pyrotechnic product made of the red pyrotechnic agent can burn under the action of electric energy to produce bright red light, and the burning process can be controlled and the burning speed can be adjusted.

[0005] The technical solution to achieve the purpose of the present invention is: a red pyrotechnic agent capable of electrically controlled combustion, wherein the red pyrotechnic agent is composed of the following in terms of mass percentage:

[0006] Hydroxylamine nitrate solution: 65-70%;

[0007] Ammonium nitrate: 2-4%;

[0008] Polyvinyl alcohol: 10-12%;

[0009] Borax: 1-2%;

[0010] Strontium-based flame colorant: 15-18%;

[0011] Pentaaminotetrazole: 2-3%.

[0012] Furthermore, the concentration of the hydroxylamine nitrate solution is ≥90%, and the hydroxylamine nitrate solution is obtained by dissolving hydroxylamine nitrate in water.

[0013] Furthermore, the alcoholysis degree of the polyvinyl alcohol is 99%, the melting point is in the range of 230-240° C., and the average polymerization degree is 2600-2800.

[0014] Furthermore, the strontium-based flame colorant is one or a mixture of two or more of strontium carbonate, strontium nitrate and strontium sulfate.

[0015] A method for preparing the above-mentioned red pyrotechnic agent comprises the following steps:

[0016] Step (1): adding hydroxylamine nitrate solution into a mixing cup;

[0017] Step (2): adding ammonium nitrate, borax and pentaaminotetrazole to the stirring cup in step (1) in sequence, and stirring manually to obtain a mixed solution;

[0018] Step (3): vacuum stirring the mixed solution obtained in step (2);

[0019] Step (4): adding polyvinyl alcohol to the semi-finished product obtained in step (3), and stirring under vacuum to obtain a uniform jelly-like slurry;

[0020] Step (5): adding the flame colorant to the slurry of step (4), manually stirring until uniform, and then vacuum stirring to obtain a uniform jelly-like slurry;

[0021] Step (6): placing the jelly-like slurry obtained in step (5) into a mold and drying it to obtain a solidified pyrotechnic sample.

[0022] Furthermore, the vacuum stirring in step (3) is specifically: vacuum stirring the mixed solution at 25-35° C. for 5-10 minutes.

[0023] Furthermore, the vacuum stirring in step (4) is: vacuum stirring at 50-60° C. for 10-15 minutes.

[0024] Furthermore, the vacuum stirring in step (5) is specifically: vacuum stirring at 50-60° C. for 15-20 minutes.

[0025] Furthermore, the drying in step (6) is specifically: placing in an oven set at a temperature of 40 to 50° C. for 7 to 10 days.

[0026] A method for controlling the combustion of the above-mentioned red pyrotechnic agent is to connect power supplies at both ends of the solid pyrotechnic agent, control the burning and extinguishing of the pyrotechnic agent by turning the power supply on and off, and control the burning speed of the pyrotechnic agent by changing the voltage of the power supply.

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] Compared with traditional pyrotechnic agents, the present invention uses ionic liquid hydroxylamine nitrate as the main oxidant. Under the action of electric energy, the ionic oxidant is electrolyzed and ion migration occurs. This electrolysis reaction ensures the controllability of the pyrotechnic agent, and can achieve controllable combustion and extinguishing and adjustable burning rate under the action of external electric energy, with higher safety and controllability.

[0029] On the other hand, the combustion products of the pyrotechnic agent of the present invention are pollution-free and meet the environmental protection requirements for pyrotechnic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The CIE1931 chromaticity diagram of the pyrotechnic agent of Example 1 of the present invention ignited and burned at a voltage of 200V at room temperature and pressure.

[0031] Figure 2 This is the CIE1931 chromaticity diagram of the pyrotechnic agent of Example 1 of the present invention ignited and burned at a voltage of 250V at room temperature and pressure.

[0032] Figure 3 The CIE1931 chromaticity diagram of the pyrotechnic agent of Example 2 of the present invention ignited and burned at a voltage of 200V at room temperature and pressure.

[0033] Figure 4 This is the CIE1931 chromaticity diagram of the pyrotechnic agent of Example 2 of the present invention ignited and burned at a voltage of 250V at room temperature and pressure.

[0034] Figure 5 This is a combustion sequence diagram of the pyrotechnic agent of Example 2 of the present invention when it is powered on and burned at a voltage of 200V, and when it is powered off and extinguished.

[0035] Figure 6 This is a combustion sequence diagram of the pyrotechnic agent of Example 2 of the present invention when it is powered on and burned at a voltage of 250V, and when it is powered off and extinguished. DETAILED DESCRIPTION

[0036] 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.

[0037] Example 1

[0038] (1) A red HAN-based electronically controlled pyrotechnic agent with controllable combustion and a preparation method thereof. The formula group and its mass fraction are shown in Table 1.

[0039] Table 1 Example 1 Formula Components

[0040] Recipe ingredients Content (%wt) Hydroxylamine nitrate (HAN) 61.7 Ammonium Nitrate (AN) 3.3 Polyvinyl alcohol (PVA) 12.4 Borax 1.3 Strontium carbonate 18.5 Pentaaminotetrazolyl 2.8

[0041] Weigh the raw materials according to the formula in Table 1;

[0042] Ammonium nitrate, borax and pentaaminotetrazole were added to a 90% by mass HAN solution in sequence, stirred manually to mix, and then vacuum stirred at 25°C for 5 minutes to obtain a uniformly mixed medicine; polyvinyl chloride was added thereto, and vacuum stirred at 50°C for 10 minutes to obtain a viscous flowable liquid; strontium carbonate was then added to the slurry, stirred manually for 90s to obtain a uniform jelly-like slurry, and then vacuum stirred at 50°C for 15 minutes to obtain a uniform slurry; finally, the slurry was placed in a mold and placed in an oven set at 40°C for 7 days to obtain a cured pyrotechnic agent sample.

[0043] (2) After experimental testing, the performance indicators of the obtained red HAN-based electronically controlled pyrotechnic agent are as follows:

[0044] At room temperature and pressure, the CIE1931 color coordinates (x, y) at 200V are (0.6438, 0.3559), such as Figure 1 As shown;

[0045] At room temperature and pressure, the CIE1931 color coordinates (x, y) at 250V are (0.6475, 0.3522), such as Figure 2 shown.

[0046] pass Figure 1 and Figure 2 It can be seen that when the voltage changes and thus changes the burning speed of the pyrotechnic agent, the flame color of the pyrotechnic agent does not change and remains red, thus achieving effective electrical control of the red pyrotechnic agent.

[0047] Example 2

[0048] (1) A red HAN-based electronically controlled pyrotechnic agent with controllable combustion and a preparation method thereof. The formula group and its mass fraction are shown in Table 2.

[0049] Table 2 Example 2 Formula Components

[0050] Recipe ingredients Content (%wt) Hydroxylamine nitrate (HAN) 61.6 Ammonium Nitrate (AN) 3.4 Polyvinyl alcohol (PVA) 12.3 Borax 1.2 Strontium carbonate 18.6 Pentaaminotetrazolyl 2.9

[0051] Ammonium nitrate, borax and pentaaminotetrazole were added to a HAN solution with a mass fraction of 90% in sequence, stirred manually to mix, and then vacuum stirred at 25°C for 3 minutes to obtain a uniformly mixed medicine; polyvinyl chloride was added thereto, and vacuum stirred at 60°C for 10 minutes to obtain a viscous flowable liquid; strontium carbonate was then added to the slurry, stirred manually for 90s to obtain a uniform jelly-like slurry, and then vacuum stirred at 60°C for 15 minutes to obtain a uniform slurry; finally, the slurry was placed in a mold and placed in an oven set at 40°C for 7 days to obtain a cured pyrotechnic agent sample.

[0052] (2) After experimental testing, the performance indicators of the obtained red HAN-based electronically controlled pyrotechnic agent are as follows:

[0053] At room temperature and pressure, the CIE1931 color coordinates (x, y) at 200V are (0.6197, 0.3798), such as Figure 3 As shown, the combustion, power-off and flameout combustion sequence is as follows Figure 5 ;

[0054] At room temperature and pressure, the CIE1931 color coordinates (x, y) at 250V are (0.6183, 0.3812), such as Figure 4 As shown, the combustion, power-off and flameout combustion sequence is as follows Figure 6 .

[0055] pass Figure 3 and Figure 4 It can be seen that when the voltage changes, thereby changing the burning speed of the pyrotechnic agent, the flame color of the pyrotechnic agent does not change and remains red.

Claims

1. A red pyrotechnic agent capable of electrically controlled combustion, characterized in that: The red pyrotechnic composition by mass percentage is as follows: Hydroxylamine nitrate solution: 65-70%; Ammonium nitrate: 2-4%; Polyvinyl alcohol: 10-12%; Borax: 1-2%; Strontium-based flame colorant: 15-18%; Pentaaminotetrazole: 2-3%.

2. The red pyrotechnic composition according to claim 1, characterized in that: The concentration of the hydroxylamine nitrate solution is ≥90%, and the hydroxylamine nitrate solution is obtained by dissolving hydroxylamine nitrate in water.

3. The red pyrotechnic composition according to claim 2, characterized in that: The alcoholysis degree of polyvinyl alcohol is 99%, the melting point is in the range of 230-240°C, and the average polymerization degree is 2600-2800.

4. The red pyrotechnic composition according to claim 3, characterized in that: The strontium-based flame colorant is one or a mixture of two or more of strontium carbonate, strontium nitrate and strontium sulfate.

5. A method for preparing the red pyrotechnic composition according to any one of claims 1 to 4, characterized in that: The steps include: Step (1): adding hydroxylamine nitrate solution into a mixing cup; Step (2): adding ammonium nitrate, borax and pentaaminotetrazole to the stirring cup in step (1) in sequence, and stirring manually to obtain a mixed solution; Step (3): vacuum stirring the mixed solution obtained in step (2); Step (4): adding polyvinyl alcohol to the semi-finished product obtained in step (3), and stirring under vacuum to obtain a uniform jelly-like slurry; Step (5): adding the flame colorant to the slurry of step (4), manually stirring until uniform, and then vacuum stirring to obtain a uniform jelly-like slurry; Step (6): placing the jelly-like slurry obtained in step (5) into a mold and drying it to obtain a solidified pyrotechnic sample.

6. The method according to claim 5, characterized in that The vacuum stirring in step (3) is specifically: vacuum stirring the mixed solution at 25-35° C. for 5-10 minutes.

7. The method according to claim 6, characterized in that The vacuum stirring in step (4) is: vacuum stirring at 50-60° C. for 10-15 minutes.

8. The method according to claim 7, characterized in that The vacuum stirring in step (5) is specifically: vacuum stirring at 50-60° C. for 15-20 minutes.

9. The method according to claim 8, characterized in that The drying in step (6) is specifically: placing in an oven set at a temperature of 40 to 50° C. for 7 to 10 days.

10. A method for controlling the combustion of the red pyrotechnic agent according to any one of claims 1 to 4, characterized in that: A power source is connected to both ends of the solid pyrotechnic agent, and the burning and extinguishing of the pyrotechnic agent is controlled by turning the power source on and off, and the burning speed of the pyrotechnic agent is controlled by changing the voltage of the power source.

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