Sulfur-free and chloride-free pyrotechnic composition
A pyrotechnic composition technology, applied in the field of sulfur-free and chlorine-free pyrotechnic composition, can solve the problems of unable to meet the needs of safe and environmentally friendly fireworks, serious environmental pollution, low reactivity, etc., to reduce the generation of harmful gases, without Effects of environmental pollution and low mechanical sensitivity
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[0055] The preparation method of the above-mentioned sulfur-free and chlorine-free pyrotechnic composition, the specific preparation steps are as follows:
[0056] 1) Grind the above-mentioned oxidant, pass the ground oxidant powder through a 100-120 mesh sieve, then dry it in a drying oven at a temperature of 70-80°C for 1-2 hours, then cool it and put it into a desiccator for later use; the above-mentioned catalyst is passed through Grind and pass through a 100-120 mesh sieve, dry at 40-50°C for 2-3 hours for later use; dry the above-mentioned primer in a drying oven at 50-60°C for 2-3 hours for later use; grind the above-mentioned combustion agent and pass through a 100-120 mesh sieve Dry it in a drying oven at a temperature of 70-80°C for 1-2 hours, and then pack it into a desiccator for later use after cooling down.
[0057] 2) According to the above ratio, the above raw materials are poured into the mortar for grinding in turn, and the grinding time is longer than 30 min...
Embodiment 1
[0066] Preparation of nickel hydrazine nitrate
[0067] Put the hydrazine hydrate aqueous solution with a concentration of 5wt% in a tall beaker, heat it in a constant temperature water bath to about 65°C, start the stirrer at the same time, adjust the voltage to a medium stirring speed, and slowly add 10 wt% by titration Nickel nitrate aqueous solution was stirred at 65°C for 10 minutes at a constant temperature after the addition of the feed, continued to stir and gradually cooled to below 35°C, and the obtained suspension was filtered with a vacuum filter, and the obtained powder sample was washed 3 times with distilled water. The powder sample is placed in a drying dish, placed in a constant temperature drying oven, and dried at 55°C for 6 hours to obtain nickel hydrazine nitrate. Under the above process conditions, the yield of nickel hydrazine nitrate is 96%, the particle size is 8.35 μm, and the fluidity is good. The product It is rose red.
Embodiment 2
[0069] Embodiment 1 Nickel hydrazine nitrate carries out demulsification method coating modification, and the steps are as follows
[0070] (1) Weigh 24g of water-based polyurethane emulsion, add it into a single-necked flask containing 50mL of distilled water at room temperature, and stir at a constant temperature of 60°C to mix the two evenly;
[0071] (2) After a certain period of time, add an appropriate amount of surfactant and continue stirring at constant temperature for 30 minutes;
[0072] (3) Cool down to the demulsification temperature, add 100g of nickel hydrazine nitrate, stir well to mix evenly;
[0073] (4) Weigh 72g of alum solution, drop the alum solution into the flask at a rate of 1 drop / s, and stir at a constant temperature of 40°C for 15 minutes, so that the water-based polyurethane is precipitated from the emulsion and coated on the surface of nickel hydrazine nitrate;
[0074] (5) Cool down, filter with suction, wash with water for 2 to 3 times, and obt...
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