Gunpowder for fireworks and crackers and preparation process of gunpowder

Abstract

The invention belongs to the field of gunpowder, and particularly relates to gunpowder for fireworks and crackers and a preparation process of the gunpowder. The preparation process comprises the following steps: mixing an oxidizing agent with water, a dispersing agent and a rheological agent, and stirring to obtain an oxidizing agent suspension; mixing a reducing agent with water, a dispersing agent and a rheological agent, and stirring to obtain a reducing agent suspension; respectively spraying the oxidizing agent suspension liquid and the reducing agent suspension liquid on paper, and then drying to respectively obtain an oxidizing agent paper roll and a reducing agent paper roll; and the oxidizing agent paper roll and the reducing agent paper roll are subjected to composite coiling. Through selection and matching of the types of the raw materials, adjustment of the formula proportion and selection of the auxiliary agents, the preparation process can successfully prepare different types of gunpowder for fireworks and crackers such as explosive powder, propellant powder and fuse powder, the universality of the preparation process is high, the preparation process is safer, and the preparation process is more environmentally friendly; and the obtained gunpowder for fireworks and crackers is also relatively good in comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the field of gunpowder, and in particular relates to gunpowder for fireworks and firecrackers and a preparation process thereof. Background Art

[0002] The gunpowder used to make fireworks and firecrackers is commonly known as pyrotechnic powder, which is subdivided into several categories according to its use, such as: explosive powder, propellant powder, high-temperature colored flame powder, low-temperature cold flame powder, fuse powder, etc. There are differences in the preparation methods, raw material selection and formula ratios of pyrotechnic powder for different uses.

[0003] At present, the industrial preparation method commonly used in the fireworks manufacturing industry to manufacture fireworks powder is to use dry powder raw materials of oxidants and reductants for physical stirring and mixing. The biggest disadvantage is that it is easy to create dust, the production safety is poor, and it is not friendly to the surrounding environment. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a preparation process of gunpowder for fireworks and firecrackers, and the preparation process comprises the following steps:

[0005] (1) Weigh the oxidant, reductant, water, dispersant and rheological agent respectively;

[0006] (2) mixing the oxidant with water, a dispersant, and a rheological agent in a weighed proportion and stirring to obtain an oxidant suspension; mixing the reductant with water, a dispersant, and a rheological agent in a weighed proportion and stirring to obtain a reductant suspension;

[0007] (3) adjusting the spraying amount and spraying the oxidant suspension and the reducing agent suspension evenly on the paper respectively, and drying after completion to obtain an oxidant paper roll and a reducing agent paper roll respectively;

[0008] (4) The oxidant paper roll and the reducing agent paper roll are rolled into a composite roll.

[0009] Preferably, in step (1), the oxidant comprises one or a combination of two or more of potassium chlorate, potassium perchlorate, potassium nitrate and barium nitrate.

[0010] Preferably, in step (1), the reducing agent comprises one or a combination of two or more of aluminum silver powder, magnesium aluminum alloy powder and carbon powder.

[0011] Preferably, in step (2), the dispersant includes a benzene-modified dispersant; the benzene-modified dispersant is BYK 190.

[0012] Preferably, in step (2), the rheological agent comprises aqueous fumed silica or aqueous polyamide.

[0013] Preferably, in step (2), the solid content of the oxidant in the oxidant suspension is 24-26%. The solid content of the oxidant is related to two factors: one is related to the oxidant used with it, and the oxygen supply set during combustion needs to be achieved; the other is that as a suspension, the smooth spraying operation requires the suspended particles to be uniform and without precipitation. Therefore, the solid content is generally around 25%.

[0014] Preferably, in step (2), the solid content of the reducing agent in the reducing agent suspension is 16-18%. The solid content of the reducing agent is related to two factors: one is related to the oxidant used with it, and the oxygen supply set during combustion needs to be achieved; the other is that as a suspension, the smooth spraying operation requires the suspended particles to be uniform and without precipitation. Therefore, the solid content is generally around 17%.

[0015] Preferably, in step (3), the spraying amount per unit area is 29 to 31 g / m 2 The determination of the spraying amount is the dry weight of the oxidant or reductant per unit area, which depends on the type of oxidant and reductant. In the present invention, it is required to be 30g / m 2 about.

[0016] Based on the same technical concept, another solution of the present invention is to provide a gunpowder for fireworks and firecrackers obtained by the above-mentioned preparation process.

[0017] The beneficial effects of the present invention are:

[0018] Through the selection and matching of raw material types, adjustment of formula ratios, and selection of auxiliary agents, the preparation process described in the present invention can successfully prepare different types of fireworks and firecracker gunpowder, such as bursting powder, propellant powder, and fuse powder. The preparation process has strong versatility, the preparation process is safer, more environmentally friendly, and the comprehensive performance of the obtained fireworks and firecracker gunpowder is also better. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0020] Example 1

[0021] This embodiment provides a preparation process of gunpowder for fireworks and firecrackers, which is suitable for preparing bursting powder and propellant powder. The preparation process comprises the following steps:

[0022] (1) Weighing the oxidizing agent potassium chlorate, the reducing agent aluminum silver powder, water, the dispersing agent BYK 190 and the rheological agent aqueous fumed silica respectively, and placing each in a separate container;

[0023] (2) Add water, dispersant BYK 190, and rheological agent aqueous fumed silica to the oxidant and reductant containers, and mechanically stir and grind them into a uniform suspension (the oxidant is partially dissolved) to reach the set solid content (the solid content of the oxidant is 25%, and the solid content of the reductant is 17%);

[0024] (3) Use two machines to spray the suspension of oxidant and reductant evenly on thin paper (30g / m 2 ), the spraying amount per unit area is adjusted to the set value. The coated paper is dried in a hot air tunnel and then rolled up for use, the process is similar to printing.

[0025] (4) A roll of paper coated with an oxidant and a roll of paper coated with a reducing agent are mounted in parallel on a composite roll machine, and the coated sides are put together. The two composite papers are rolled into a dense paper stick and cut into cylindrical "paper stick pellets". The size and length of the paper stick pellets are set according to the needs of the downstream process. The paper stick pellets can be used as propellants for fireworks, and can also be used as explosives for firecrackers and thunder bombs.

[0026] Example 2

[0027] This embodiment provides a preparation process of gunpowder for fireworks and firecrackers, which is suitable for preparing ignition line powder. The preparation process comprises the following steps:

[0028] (1 Weigh the oxidizing agent potassium perchlorate, the reducing agent magnesium aluminum alloy powder, water, the dispersing agent BYK 190 and the rheological agent water-based polyamide respectively, and place them in separate containers;

[0029] (2) Add water, dispersant BYK 190, and rheological agent water-based polyamide to the oxidant and reductant containers in sequence, and mechanically stir and grind them into a uniform suspension (the oxidant is partially dissolved) to reach the set solid content (the solid content of the oxidant is 25%, and the solid content of the reductant is 17%);

[0030] (3) Use two machines to spray the suspension of oxidant and reductant evenly on thin paper (30g / m 2 ), the spraying amount per unit area is adjusted to the set value. The coated paper is dried in a hot air tunnel and then rolled up for use, the process is similar to printing.

[0031] (4) A roll of paper coated with an oxidizing agent and a roll of paper coated with a reducing agent are mounted in parallel on a composite reel machine, with the coated sides brought together.

[0032] During the spraying step (3), the paper is divided into narrow strips and rolled into narrow paper rolls. The coated surfaces are opposite each other, and the oxidant-reducer paper rolls are mounted on a guide making machine, which rolls them into long and thin guide wires.

[0033] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A process for preparing gunpowder for fireworks and firecrackers, characterized in that: The preparation process comprises the following steps: (1) Weigh the oxidant, reductant, water, dispersant and rheological agent respectively; (2) mixing the oxidant with water, a dispersant, and a rheological agent in a weighed proportion and stirring to obtain an oxidant suspension; mixing the reductant with water, a dispersant, and a rheological agent in a weighed proportion and stirring to obtain a reductant suspension; (3) adjusting the spraying amount and spraying the oxidant suspension and the reducing agent suspension evenly on the paper respectively, and drying after completion to obtain an oxidant paper roll and a reducing agent paper roll respectively; (4) The oxidant paper roll and the reducing agent paper roll are rolled into a composite roll.

2. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (1), the oxidant includes one or a combination of two or more of potassium chlorate, potassium perchlorate, potassium nitrate and barium nitrate.

3. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (1), the reducing agent includes one or a combination of two or more of aluminum silver powder, magnesium aluminum alloy powder, and carbon powder.

4. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (2), the dispersant includes a benzene-modified dispersant; the benzene-modified dispersant is BYK 190.

5. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (2), the rheological agent includes water-based fumed silica or water-based polyamide.

6. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (2), the solid content of the oxidant in the oxidant suspension is 24-26%.

7. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (2), the solid content of the reducing agent in the reducing agent suspension is 16-18%.

8. The process for preparing gunpowder for fireworks and firecrackers according to claim 1, characterized in that: In step (3), the spraying amount per unit area is 29-31 g / m 2 .

9. Explosive powder for fireworks and firecrackers obtained by the preparation process according to any one of claims 1 to 8.