Preparation method of moisture-proof glue for fireworks

Abstract

The invention discloses a preparation method of moisture-proof glue for fireworks, and belongs to the technical field of fireworks. The invention provides a preparation method of moisture-proof glue for fireworks for expanding a recycling way of waste double-base propellant powder, and the moisture-proof glue is prepared by taking the waste double-base propellant powder as a raw material and dissolving the waste double-base propellant powder in an organic solvent. According to the method, the solvent is used for dissolving the waste double-base propellant powder, the initial structure and morphology of the waste double-base propellant powder are destroyed, modification of the waste double-base propellant powder is achieved, the waste double-base propellant powder is used for preparing the double-base liquid moisture-proof glue in the firework industry, application of the waste double-base propellant powder in the firework industry is achieved, and the problem of resource recycling of the waste double-base propellant powder is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of fireworks, and particularly relates to a method for preparing moisture-proof glue for fireworks. Background Art

[0002] Usually, gunpowder used for barreled weapons such as guns and cannons is called propellant. Propellant has a certain service life. In peacetime, a large number of propellants are retired every year when the expected storage time is reached; at the same time, weapons updates, ammunition scrapping, and unqualified products in the production process also cause a lot of waste propellants. Because of its combustion and explosion characteristics, waste propellants will endanger the social environment and personal safety. Therefore, the treatment of waste propellants cannot be ignored and must be handled safely in a timely manner. There are traditional destruction technology, green destruction technology, or recycling and reuse technology to deal with waste propellants. Traditional destruction technology can handle a large amount of waste propellants with low cost and simple treatment process, but there are major safety hazards, a large amount of polluted waste, and a waste of manpower and material resources; green destruction technology can meet the requirements of safety and environmental protection, but the processing capacity is limited, the processing cost is high, and the economic benefits are low; recycling and reuse technology can realize the resource utilization of waste propellants, bring economic benefits while processing waste propellants, and is an effective way to deal with waste propellants.

[0003] The reuse of waste propellants often adopts the method of modification or modification. The modification technology is relatively complex and has high investment costs. It is used for waste propellants with high recovery value. Relatively speaking, the modification process is simple. Generally, only the shape of waste explosives can be changed to directly use them. For example, waste crushed propellants are used to make detonating columns, and sheet or strip double-force explosives are modified to make small-grained explosives. For example, Wang Zeshan and others used waste single-base explosives, ammonium nitrate, sodium nitrate, etc., through dissolving, swelling, foaming and cross-linking processes, to make a low-cost slurry explosive that can be directly detonated by No. 8 industrial detonators; Gu Jianliang and others used Shuangfang-3 as the object to study the formula and performance of industrial slurry explosives prepared from waste double-base explosives. The reuse of waste propellants is mainly used in the civil explosives industry, and less in the fireworks industry. At present, there is no report on the use of waste propellants to prepare moisture-proof glue.

[0004] Fireworks contain a large amount of black powder. The charcoal in the firework has a porous structure and is easy to absorb moisture from the air. The potassium nitrate as an oxidant is also very easy to absorb water and deliquesce, which seriously damages the performance of the black powder and even loses the firing performance, bringing many hidden dangers to the production, use and storage of fireworks. Therefore, the use of moisture-proof glue can effectively solve these problems, but the traditional moisture-proof glue simply plays a moisture-proof role in the fireworks system, and does not significantly improve the overall performance of fireworks; while the waste double-base propellant itself contains a high energy, and the moisture-proof glue prepared can not only show good moisture-proof performance, but also does not lose the system energy when the fireworks are fired, which is of great significance to improving the firing performance and storage stability of fireworks. Summary of the invention

[0005] In order to expand the reuse channels of waste double-base propellants, the present invention utilizes a solvent to dissolve the waste double-base propellants, destroying their original structure and morphology so that they can no longer be used as propellants for barreled weapons, thereby realizing the modification of the waste double-base propellants and using them to prepare double-base liquid moisture-proof glue for the fireworks industry, thereby realizing the application of waste propellants in the fireworks industry.

[0006] To achieve the above object, the present invention provides a method for preparing moisture-proof glue for fireworks. The moisture-proof glue is prepared by dissolving waste double-base propellant as raw material with an organic solvent.

[0007] In the present invention, the waste double-base propellant is in the form of particles, blocks, strips, etc. with regular shapes and sizes. The waste double-base propellant (crushed powder) is mixed and stirred with a certain proportion of solvent, and the waste double-base propellant particles and the solvent swell and dissolve, and the propellant is subjected to morphological destruction treatment to form a light yellow transparent flowable viscous colloid, and the weight and proportion of the solvent are appropriately adjusted according to the requirements for the viscosity of the colloid.

[0008] Wherein, in the preparation method of the moisture-proof glue for fireworks, the organic solvent is at least one of methanol, ethanol, acetone or ethyl acetate.

[0009] Preferably, in the method for preparing the moisture-proof glue for fireworks, the organic solvent is acetone.

[0010] Among them, in the preparation method of the moisture-proof glue for fireworks, the mass ratio of the waste double-base propellant to the organic solvent is 1:4-10.

[0011] Preferably, in the method for preparing the moisture-proof glue for fireworks, the mass ratio of the waste double-base propellant to the organic solvent is 1:6-8.

[0012] Among them, the preparation method of the moisture-proof glue for fireworks includes the following steps: crushing the waste double-base propellant into fine powder, mixing it with an organic solvent, and stirring it so that the waste double-base propellant continuously swells and dissolves to obtain liquid glue, which is the moisture-proof glue for fireworks.

[0013] In the present invention, the crushing is mainly for the waste double-base propellant with larger size, and a crusher is used for crushing, so as to facilitate the dissolution in the next step, improve the efficiency of dissolution, and reduce the dissolution time. The crushing should be carried out under water conditions to ensure safety. After crushing, the crushed powder is obtained by centrifugation or vacuum dehydration. According to the test, in the preparation method of the moisture-proof glue for fireworks, the crushing is refined to a particle size of ≤2.5mm.

[0014] Wherein, in the preparation method of the moisture-proof glue for fireworks, the stirring time is 0.5 to 6 hours.

[0015] In the present invention, the waste double-base propellant moisture-proof glue has a certain fluidity, can flow out or extrude under gravity or pressure conditions, and is packaged, sealed, and packaged in plastic bags to form products. The packaging weight can be set by a fixed volume or quantitative method. When the moisture-proof glue of the present invention is used, it is directly applied to the firework fuse, effect parts, etc., and dried naturally.

[0016] In the present invention, the waste double-base propellant is a defective product or retired propellant in the production process, and has different shapes and sizes. The present invention changes the structure, size and shape of the waste double-base propellant by adding an organic solvent, so that it is changed from a burning explosive to a dangerous chemical, thereby improving its safety in the later transportation and use.

[0017] Beneficial effects of the present invention:

[0018] The present invention adopts an organic solvent to modify the waste double-base propellant. The modification method has a simple process and can be implemented by mechanical processing. Human-machine isolation is achieved and the safety is high. The plastic bag is packaged in a fixed volume or quantitative manner, the amount of glue can be more reasonably controlled, and processing is convenient. The process procedures are easy to standardize and assembly line operation. The problem of resource recycling of waste double-base propellant is solved, and the application of waste double-base propellant in the fireworks industry is expanded, and it has a wide range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a diagram showing the effect of waste double-base propellant and acetone solvent at a mass ratio of 1:4.

[0020] Figure 2 This is a diagram showing the effect of waste double-base propellant and acetone solvent at a mass ratio of 1:6.

[0021] Figure 3 This is a diagram showing the effect of waste double-base propellant and acetone solvent at a mass ratio of 1:8. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below by way of examples, but the protection scope of the present invention is not limited to the scope of the examples.

[0023] Example 1

[0024] This embodiment uses waste double-base propellant as raw material, and refines the waste propellant to a particle size of ≤2.5mm by crushing, and then dissolves it through the organic solvent ethyl acetate under the action of mechanical stirring. The formula mass ratio is 100 parts of waste double-base propellant particles and 400 parts of ethyl acetate solvent. After mechanical stirring for 0.5h, under the dissolving action of the solvent, the waste double-base propellant continues to swell and dissolve, and its original morphology and size change. Finally, the waste double-base propellant is completely dissolved into liquid glue, which is the obtained double-base moisture-proof glue. The double-base moisture-proof glue is light yellow and transparent. Although it has a certain fluidity, it has a large viscosity. Through a fixed volume or quantitative method, a "double-base glue liquid package" product is obtained by plastic packaging with a plastic bag or a paper bag, which is convenient for later shipment and use.

[0025] Example 2

[0026] This embodiment uses waste double-base propellant as raw material, and refines the waste propellant to a particle size of ≤2.5mm by crushing, and then dissolves it in an organic solvent acetone under the action of mechanical stirring. The formula weight ratio is 100 parts of waste double-base propellant particles and 400 parts of acetone solvent. After mechanical stirring for 0.5 hours, under the dissolving action of the solvent, the waste double-base propellant continues to swell and dissolve, and its original morphology and size change. Finally, the waste double-base propellant is completely dissolved into liquid glue, which is the prepared double-base moisture-proof glue. The double-base moisture-proof glue is light yellow and transparent, and has a certain fluidity and viscosity (see Figure 1 ). Through the method of fixed volume or quantitative, the "double-base glue package" product is obtained by plastic packaging with plastic bags or paper bags, which is convenient for later transportation and use.

[0027] Example 3

[0028] This embodiment uses waste double-base propellant as raw material, and refines the waste propellant to a particle size of ≤2.5mm by crushing, and then dissolves it in an organic solvent acetone under the action of mechanical stirring. The formula weight ratio is 100 parts of waste double-base propellant particles and 600 parts of acetone solvent. After mechanical stirring for 0.5h, under the dissolving action of the solvent, the waste double-base propellant continues to swell and dissolve, and its original morphology and size change. Finally, the waste double-base propellant is completely dissolved into liquid glue, which is the prepared double-base moisture-proof glue. The double-base moisture-proof glue is light yellow and transparent, has a certain fluidity, and the viscosity is equivalent to that of the liquid glue (see Figure 2). Through the method of fixed volume or quantitative, the "double-base glue package" product is obtained by plastic packaging with plastic bags or paper bags, which is convenient for later transportation and use.

[0029] Example 4

[0030] This embodiment uses waste double-base propellant as raw material, and refines the waste propellant to a particle size of ≤2.5mm by crushing, and then dissolves it in an organic solvent acetone under the action of mechanical stirring. The formula weight ratio is 100 parts of waste double-base propellant particles and 800 parts of acetone solvent. After mechanical stirring for 0.5 hours, under the dissolving action of the solvent, the waste double-base propellant continues to swell and dissolve, and its original morphology and size change. Finally, the waste double-base propellant is completely dissolved into liquid glue, which is the prepared double-base moisture-proof glue. The double-base moisture-proof glue is light yellow and transparent, has a certain fluidity, a small solid-liquid ratio, and a low viscosity (see Figure 3 ). Through the method of fixed volume or quantitative, the "double-base glue package" product is obtained by plastic packaging with plastic bags or paper bags, which is convenient for later transportation and use.

[0031] The double-base moisture-proof glue prepared in Examples 1-4 and the traditional moisture-proof glue were applied to the fuse of fireworks, and the moisture content was tested under the environmental condition of humidity ≥ 80% RH to compare the moisture-proof performance of the moisture-proof glue; as well as the stability, viscosity of the glue liquid and the transmittance measured by the smoke box method to reflect the amount of smoke from combustion. The specific test results are shown in Table 1.

[0032] Table 1 Moisture-proof adhesive performance comparison table

[0033]

[0034] Note: Traditional moisture-proof glue is a liquid glue mainly prepared from methanol, acetone, rosin, celluloid, etc.

[0035] It can be seen from Table 1 that the moisture-proof glue obtained by the present invention can achieve moisture-proof performance equivalent to or better than that of traditional moisture-proof glue, ensure the storage stability of the product while improving the firing performance of fireworks; the glue prepared in Example 1 has a large viscosity, which is inconvenient to apply during use, and the solid content of the glue used to apply the same surface is relatively high, so the cost is relatively high; the type and amount of solvent directly affect the viscosity of the glue, and then affect its performance. A large viscosity and poor fluidity are not conducive to the coating of the glue, so it is preferably controlled that the mass ratio of the propellant and the organic solvent is 1:6-8.

[0036] In the preliminary test of the present invention, ethanol, ethyl acetate and acetone were selected from the commonly used organic solvents such as alcohols, esters and ketones to carry out the following dissolution test. The test intends to use 100 parts of waste double-base propellant and 400 parts of organic solvent, and mechanically stir for 30 minutes to compare the dissolution effect of different solvents on waste double-base propellant.

[0037] By comparison, it is found that ethanol solvent can only swell the waste double-base propellant, but cannot dissolve it to form a colloid to achieve the purpose of use; ethyl acetate can swell and dissolve the waste double-base propellant, but the dissolution rate is not as fast as that of acetone solvent, and the boiling point of ethyl acetate is higher than that of acetone solvent. Therefore, in actual use, acetone solvent evaporates faster than ethyl acetate and can play a moisture-proof role more quickly; acetone solvent can dissolve the waste double-base propellant well to form a uniform, transparent colloid. Therefore, by comparison, the double-base moisture-proof glue prepared by acetone solvent is uniform and stable compared with other solvents, and is a better solvent for preparing double-base moisture-proof glue for fireworks.

Claims

1. A method for preparing moisture-proof glue for fireworks, characterized in that: The moisture-proof glue is prepared by dissolving waste double-base propellant as raw material in an organic solvent.

2. The method for preparing moisture-proof glue for fireworks according to claim 1, characterized in that: The organic solvent is at least one of methanol, ethanol, acetone or ethyl acetate.

3. The method for preparing moisture-proof glue for fireworks according to claim 2, characterized in that: The organic solvent is acetone.

4. The method for preparing moisture-proof glue for fireworks according to claim 1, characterized in that: The mass ratio of the waste double-base propellant to the organic solvent is 1:4-10.

5. The method for preparing moisture-proof glue for fireworks according to claim 4, characterized in that: The mass ratio of the waste double-base propellant to the organic solvent is 1:6-8.

6. The method for preparing the moisture-proof glue for fireworks according to any one of claims 1 to 5, characterized in that: The following steps are involved: The waste double-base propellant is crushed into fine powder, mixed with an organic solvent, and stirred, so that the waste double-base propellant continuously swells and dissolves to obtain liquid glue, which is the moisture-proof glue for fireworks.

7. The method for preparing moisture-proof glue for fireworks according to claim 6, characterized in that: Grind to a particle size of ≤2.5mm.

8. The method for preparing moisture-proof glue for fireworks according to claim 6, characterized in that: The stirring time is 0.5 to 6 hours.

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