Preparation method of safe and environment-friendly firework propellant powder based on self-sustaining reaction

Abstract

The invention discloses a preparation method of safe and environment-friendly firework propellant powder based on self-sustaining reaction, and belongs to the technical field of fireworks and crackers. The safe and environment-friendly firework propellant powder is prepared from the following components in parts by weight: 30-75 parts of high-molecular fluorine polymer with the particle size of 50-400 microns; 25-70 parts of active metal powder with a particle size of 10-75 [mu]m; 0.5-3 parts of a silane coupling agent; and 0.5-5 parts of a binder. The preparation method adopts the processes of chemical modification, coating, powder mixing, granulation, drying and the like, and is simple in process, free of special process requirements, low in cost and convenient for batch production. According to the invention, the defects of high product pollution, high mechanical sensitivity, high static and spark sensitivity and low safety in the production and transportation process of the current black powder for fireworks and crackers can be overcome. The obtained product has the advantages of being free of sulfur and nitrogen, little in smoke, environmentally friendly, low in mechanical sensitivity, high in safety and the like, and can be widely applied to production of propellant powder for fireworks and crackers.

Description

technical field

[0001] The invention relates to a method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, and belongs to the technical field of fireworks and firecrackers. Background technique

[0002] In the production of fireworks and firecrackers, black powder is one of the important raw materials. Black powder is a mixture of potassium nitrate (oxidant), charcoal (reductant) and sulfur (combustible). Its advantages are low price, safe operation and easy manufacture. But black gunpowder can produce a large amount of black smog when burning, influences the setting off effect of fireworks, and combustion is incomplete, there will be a large amount of oxides and solid residue of carbon, sulfur, potassium in the residue, serious environmental pollution. In terms of safety, black powder has a high mechanical sensitivity, and it can ignite or explode when it is subjected to a strong impact or friction. Danger. Contents ...

Examples

Embodiment 1

[0027] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0028] (1) First modify and coat the metal powder

[0029] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 8 parts of spherical aluminum powder and 22 parts of spherical magnesium powder into the solution, soak 6h, filter and dry to obtain modified metal powder; wherein, the particle size of the aluminum powder is 10 μm, and the particle size of the magnesium powder is 10 μm;

[0030] Coating: Weigh 2 parts of fluororubber 2602 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 30 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain fluororubber coating Dispersion of metal powder.

[0031] (2) Preparat...

Embodiment 2

[0036] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0037] (1) First modify and coat the metal powder

[0038] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 30 parts of spherical magnesium powder into the solution, soak for 6 h, filter and dry to obtain Modified metal powder; among them, the particle size of aluminum powder is 10 μm, and the particle size of magnesium powder is 20 μm;

[0039] Coating: Weigh 2 parts of fluororubber 2602 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 30 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain fluororubber coating Dispersion of metal powder.

[0040] (2) Preparation of fireworks propellant particles

...

Embodiment 3

[0045] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0046] (1) First modify and coat the metal powder

[0047] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 45 parts of spherical zinc powder and 12 parts of spherical magnesium powder into the solution, soak 6h, filter and dry to obtain modified metal powder; wherein, the particle size of zinc powder is 10 μm, and the particle size of magnesium powder is 40 μm;

[0048] Coating: Weigh 2 parts of silicone rubber 2153 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 57 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain a silicone rubber coating Dispersion of metal powder.

[0049] (2) Preparation of ...

technical field

[0001] The invention relates to a method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, and belongs to the technical field of fireworks and firecrackers. Background technique

[0002] In the production of fireworks and firecrackers, black powder is one of the important raw materials. Black powder is a mixture of potassium nitrate (oxidant), charcoal (reductant) and sulfur (combustible). Its advantages are low price, safe operation and easy manufacture. But black gunpowder can produce a large amount of black smog when burning, influences the setting off effect of fireworks, and combustion is incomplete, there will be a large amount of oxides and solid residue of carbon, sulfur, potassium in the residue, serious environmental pollution. In terms of safety, black powder has a high mechanical sensitivity, and it can ignite or explode when it is subjected to a strong impact or friction. Danger. Contents ...

Examples

Embodiment 1

[0027] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0028] (1) First modify and coat the metal powder

[0029] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 8 parts of spherical aluminum powder and 22 parts of spherical magnesium powder into the solution, soak 6h, filter and dry to obtain modified metal powder; wherein, the particle size of the aluminum powder is 10 μm, and the particle size of the magnesium powder is 10 μm;

[0030] Coating: Weigh 2 parts of fluororubber 2602 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 30 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain fluororubber coating Dispersion of metal powder.

[0031] (2) Preparat...

Embodiment 2

[0036] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0037] (1) First modify and coat the metal powder

[0038] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 30 parts of spherical magnesium powder into the solution, soak for 6 h, filter and dry to obtain Modified metal powder; among them, the particle size of aluminum powder is 10 μm, and the particle size of magnesium powder is 20 μm;

[0039] Coating: Weigh 2 parts of fluororubber 2602 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 30 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain fluororubber coating Dispersion of metal powder.

[0040] (2) Preparation of fireworks propellant particles

...

Embodiment 3

[0045] A method for preparing a safe and environment-friendly fireworks propellant based on a self-sustaining reaction, the specific steps are as follows:

[0046] (1) First modify and coat the metal powder

[0047] Surface modification: Weigh 1 part of silane coupling agent KH570 and add it to 50 mL of ethyl acetate, stir for 0.5 h, and under the protection of an inert atmosphere, disperse 45 parts of spherical zinc powder and 12 parts of spherical magnesium powder into the solution, soak 6h, filter and dry to obtain modified metal powder; wherein, the particle size of zinc powder is 10 μm, and the particle size of magnesium powder is 40 μm;

[0048] Coating: Weigh 2 parts of silicone rubber 2153 and add it to 50 mL of ethyl acetate, stir until completely dissolved, and disperse the above 57 parts of modified metal powder into the solution, stir for 2 hours at a speed of 200 rpm / min to obtain a silicone rubber coating Dispersion of metal powder.

[0049] (2) Preparation of ...