WO2020206624A1

WO2020206624A1 - Environment-friendly firecracker having long-lasting luminous flame and capable of realizing self-combustion, and manufacturing method therefor

Info

Publication number: WO2020206624A1
Application number: PCT/CN2019/081991
Authority: WO
Inventors: 张敬敏
Original assignee: 微山宏瑞电力科技有限公司
Priority date: 2019-04-10
Filing date: 2019-04-10
Publication date: 2020-10-15

Abstract

An environment-friendly firecracker having long-lasting luminous flame and capable of realizing self-combustion. The environment-friendly firecracker comprises five structural layers, namely, a fixed structure, a gas film layer, an initial combustion layer, a sealing layer, and a high-pressure burst layer from outside to inside; the fixed structure is specifically an EAA grid layer; the gas film layer is specifically a non-vulcanized ethylene propylene diene monomer rubber film; the initial combustion layer is specifically a mixed layer formed by mixing methane and oxygen according to a volume ratio of 1:1 to form a mixture with the gas pressure being 1.1-1.2 times of the atmospheric pressure which is then mixed with a solid organic salt; the sealing layer is specifically a mixed layer formed by mixing the EAA, the non-vulcanized ethylene propylene diene monomer rubber film, and sodium peroxide powder according to a mass ratio of 8:1.8:0.2. The firecracker has good bursting effect and long-lasting luminous flame, is made of pollution-free raw materials and is capable of realizing self-combustion, and yields harmless combustion products. Also disclosed is a manufacturing method for the environment-friendly firecracker.

Description

Environmentally friendly firecracker with long-lasting flame and self-ignition and manufacturing method thereof

Technical field

The invention relates to the field of special materials, in particular to an environmentally friendly firecracker with long-lasting flame and self-ignition and a manufacturing method thereof.

Background technique

The environmentally friendly firecrackers in the prior art generally refer to colored light firecrackers made of electrically driven cement-based materials. The colored light firecrackers are a new, efficient, and safe colored firecracker that is not only bright in color, but also environmentally friendly. The production process of traditional firecrackers is complicated, slow and costly, especially when dispensing is very dangerous, which often causes hidden dangers and hazards. The emergence of colored light firecrackers has changed this situation. The colorful light firecrackers will show colorful dazzling light when they are set off. They are very beautiful and safe to set off. This kind of safe salute is very low in price and fully personalized. It is a new firecracker choice and is very popular. But even for color light firecrackers, according to the Shanghai Municipal Quality and Technical Supervision Bureau has done risk monitoring on electronic firecrackers, according to data analysis, as of February 2018, the electronic firecrackers products on the market do not meet the national safety requirements and are not compliant items Most of them are basic safety items, such as structural requirements for preventing electric shock, electrical clearance and creepage distance, electrical strength, power connection and external flexible cord, and plug type and size. If these items do not meet the requirements, it may cause electric shock or even fire hazards, resulting in physical disability, burns and even death.　

technical problem

The environmental protection firecrackers in the prior art are limited by the lack of technical fields and practical experience. The environmental protection firecrackers in the full sense have not really appeared. Therefore, there is still no one on the market with good bursting effect, green raw materials and pollution-free, long-lasting flames. Self-burning and harmless environmental firecrackers.

Technical solutions

In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solution: a manufacturing method of environmentally friendly firecrackers with long-lasting self-ignition with light flame, including the following steps:

　　1) Raw material preparation

　　①Prepare enough methane, oxygen, 5-ethylidene-2-norbornene, ethylene, propylene, acrylic acid, sodium peroxide powder, a solid core of fire paper wrapped with activated carbon powder, and paraffin wax;

　　2) Manufacturing of structures

　　① Polymerize 5-ethylidene-2-norbornene, ethylene, and propylene at a mass ratio of 1:10:9, and leave it for use without vulcanization to obtain a ready-to-use non-vulcanized EPDM rubber;

②Polymerize ethylene and acrylic acid according to the mass ratio of 2:3 and extrude them into EAA wire with a diameter of 1.5mm-2mm, and weave the obtained EAA wire into a mesh basket with a grid gap of 1mm-1.5mm according to the required firecracker outline size Structure, get ready-to-use basket;

③Polymerize ethylene and acrylic acid into EAA according to the mass ratio of 7:3. When EAA is still in the molten pool state, mix the unvulcanized EPDM rubber prepared in step ① and the sodium peroxide powder prepared in step ① In the molten pool and stir evenly, the mixing ratio is calculated as EAA/non-vulcanized EPDM rubber to be used/sodium peroxide powder 8/1.8/0.2 according to the mass ratio; the molten pool after mixing is injection molded into a hollow shell , The outline volume of the hollow formwork is 1/2-2/3 of the required firecracker outline volume;

④Mix methane and oxygen in a volume ratio of 1:1, then mix with solid organic salt powder with a total mass of 0.1%-0.3% of the gas mass, and inject it into a gas transmission device equipped with a gas pressure detection device as raw material A; Potassium hydroxide hydrothermal solution with a fraction of 50%-60% is used as raw material B, and the hydrothermal solution is specifically an aqueous solution with a temperature of 80°C to 90°C;

⑤Use a needle syringe to extract the air in the hollow mold shell obtained in step ③ in a vacuum environment, and then use an air delivery device equipped with a pressure detection device to inject into the hollow mold shell through a small diameter hollow needle with a diameter of 0.2mm-0.3mm Step ④ The obtained raw material A, until the air pressure in the hollow mold shell rises to 7 to 8 times atmospheric pressure, and then slowly withdraw the thin hollow needle until the tip of the thin hollow needle retreats to contact with the entity in the hollow mold shell. For the raw material B obtained in the dripping step ④, the pinholes are melt-sealed and the pinholes are hardened to obtain a composite high-pressure burst layer with a sealing layer to be used;

　　⑥The unvulcanized EPDM rubber to be used obtained in step ① is injection molded into a balloon-shaped hollow unilateral opening film that is compatible with the inner wall of the basket obtained in step ② to obtain a gas film layer to be used;

　　3) Manufacture of environmentally friendly firecrackers

① Put the composite high-pressure bursting layer of the sealing layer to be used obtained in step 2) in step ⑤ in the gas film layer to be used in step 2), and cover the outer surface of the gas film layer to be used in step 2). Use a mesh basket, and then inject the air pressure 1.1-1.2 times into the air film layer to be used in stage 2) Step ④ The raw material A obtained until the outer wall of the air film layer to be used is tightly attached to the inner wall of the basket to be used, and then stage 1 ) In step ①, the prepared fire paper solid core that is mixed and wrapped with activated carbon powder is inserted into the open end, and the joint between the open end and the fire paper solid core is sealed with paraffin to obtain prefabricated firecrackers;

　　②Package and paint the prefabricated firecrackers obtained in step ① to obtain the required long-lasting self-igniting environmentally friendly firecrackers.

　　 In the above-mentioned manufacturing method of long-lasting self-ignition environmentally friendly firecrackers, the solid organic salts are specifically organics containing potassium, copper, and calcium, and solid organic salts containing corresponding metal elements are selected according to the required flame color requirements.

The environmentally friendly firecrackers with long-lasting self-ignition made by using the above method. The environmentally friendly firecrackers include five structural layers from the outside and the inside, namely a fixed structure, a gas film layer, a primary combustion layer, a sealing layer, and a high-pressure burst layer; the fixed structure is specific It is an EAA mesh layer copolymerized with ethylene and acrylic acid at a mass ratio of 2:3. The mesh layer is specifically a mesh basket fixed on the outer surface of the air film layer with a mesh gap of 1 mm-1.5 mm; the air film layer is specifically 5- Ethylene-2-norbornene, ethylene, and propylene are non-vulcanized EPDM rubber film copolymerized at a mass ratio of 1:10:9; the primary combustion layer is specifically methane and oxygen mixed at a volume ratio of 1:1 to form air pressure It is a mixed layer mixed with solid organic salt after 1.1 times to 1.2 times the atmospheric pressure; the sealing layer is specifically divided into three parts, and the three parts are physically combined with each other, and the three parts are specifically reinforcement, stabilizer and degradation promotion It is the sealing layer after they are mixed at a mass ratio of 8:1.8:0.2. The reinforcement is EAA copolymerized with ethylene and acrylic acid at a mass ratio of 7:3, and the stabilizer is specifically 5-ethylidene-2-norbornene. The non-vulcanized EPDM rubber copolymerized with ethylene and propylene at a mass ratio of 1:10:9, and the degradation accelerator is sodium peroxide powder; the high-pressure burst layer is specifically formed by mixing methane and oxygen at a volume ratio of 1:1 A mixed gas layer mixed with solid organic salt after 7 to 8 times atmospheric pressure.

　　 In the above-mentioned long-lasting self-ignition environmental firecrackers, the solid organic salts are specifically organics containing potassium, copper, and calcium, and solid organic salts containing corresponding metal elements are selected according to the required flame color requirements.

Compared with the prior art, due to the adoption of the above technical solution, the present invention has the following advantages: (1) Unlike another patent that was applied for at the same time, the inventive concept of the present invention has changed from making the residue easy to degrade to making the cured organic matter more Fully combusts, obtains longer burning time and longer light trailing, through sodium peroxide to absorb the carbon dioxide released by combustion to release oxygen, promote combustion, and at the same time, because of the continuous supply of oxygen, the present invention is less flammable The solid organic matter used continues to burn during the process of being broken up by air pressure, reducing the residue on the ground while prolonging the burning time, using the yellow flame of sodium itself to obtain a longer flame trail, and the burning effect is better. (2) The rough combination of gunpowder, flammable metal (such as magnesium) and paper rolls that are different from conventional firecrackers, and the color light firecrackers made of cement-based materials that are electrically driven in the prior art, also have great safety risks , The present invention adopts the structure of imitating original firecrackers, and improves the firecracker structure, replacing raw materials, and replacing the scattered flower driving method on the basis of the existing original firecracker process. The obtained environmentally friendly firecrackers are neither insurmountable It is completely safe and pollution-free. It is the best alternative to the existing technology and conventional firecrackers. The market application prospect is also very good. (3) The EPDM rubber of the specific ratio of the present invention uses all raw materials containing only C, H and O elements, and the EPDM rubber configured according to the ratio provided by the present invention has elongation and anti-aging Both performance and airtightness are excellent. It is worth mentioning that the present invention deliberately omits the vulcanization process (all EPDM rubbers in the prior art must be vulcanized to ensure their mechanical properties and chemical stability). The EPDM rubber used in the present invention has low strength, poor chemical stability but good toughness and good air tightness. It is a special choice consistent with the technical purpose of the present invention (according to the EPDM rubber in the present invention). Judging from the actual effect, it plays the role of softening buffer and low-pressure sealing. It is even obvious that during the firing of firecrackers, if the chemical stability of EPDM is good, it is not conducive to combustion, and it is not vulcanized. The EPDM rubber is a relatively flammable material), and because it is not vulcanized, it further reduces production pollution and combustion pollution. (4) As the skeleton and supporting structure is EAA, which is ethylene acrylic acid copolymer. This material is adjusted according to the ratio of ethylene and acrylic acid in its polymerization raw materials and has different properties. Among them, the higher the ethylene ratio, the higher the strength and the rigidity. However, it is brittle, fragile, and powdery. A high proportion of acrylic acid results in good toughness and high elastic limit, but poor rigidity and chemical stability. (5) The use of hot-alkali fusion sealing utilizes the principle that EAA encounters the full melting and embrittlement of concentrated hot alkali when the proportion of ethylene is high, and seals the holes left by the pore hollow needles, and at the same time, to make up for the volume. The lack of pores is brittle and hardened to strengthen the sealing strength. It is simple and easy to achieve. The sealing effect is quite excellent because it makes full use of the fluidity of the liquid and the filling ability under high pressure. Due to the high pressure burst layer and its sealing layer of the core The structure is consistent, and it can be transported in batches as parts after the process of off-site production. It is executed separately from the simple procedures of other parts, which greatly simplifies the production process, reduces the potential safety hazards, and reduces the production threshold, which is beneficial to the market. Application promotion, good practicability. (6) The direct combination of methane and oxygen makes use of the wide range of methane sources and extremely stable chemical properties at room temperature. The volume ratio to oxygen is set to 1:1 because it only needs to be fully initially burned and placed in the sealing layer The internally solidified sodium peroxide powder will absorb the combustion product carbon dioxide and continue to release oxidation. In this way, more methane can be obtained as the raw material for combustion, and the combustion will proceed more fully. Because the combustible heat of gasified methane is not high (number of moles) Low, which is 1/1000 of the same volume of liquefied gas), which is a gas fuel, and the volume of the gas produced by combustion and the original gas remains unchanged under the condition of full combustion (CH4+2O2=CO2+2H2O), even 7 times of the present invention -8 times the air pressure compression will only expand the space volume by 7 times to 8 times, the space occupancy is low, so the risk is low (much lower than the black powder when every 4 grams burns, produces 280 liters of gas, the volume can expand nearly 10,000 At the same time, even if methane is in a pure oxygen environment, its ignition temperature is not lower than 350℃, so under normal circumstances, the safety is excellent, which is much higher than the 70℃ of black powder used in conventional firecrackers, or phosphorous ignition On the other hand, there will be no dielectric safety issues and production threshold issues for electronic firecrackers. (7) The present invention reasonably utilizes the essential characteristics and performance of the material, and uses the principle that the tensile strength of EAA is about 20MPa (200 times the atmospheric pressure) under the condition of ethylene: acrylic acid 7:3. It also uses unvulcanized EPDM rubber and sodium peroxide powder to reduce its chemical stability and makes it more flammable. At the same time, it uses the principle of sodium peroxide powder to absorb carbon dioxide and convert it into oxygen to make firecrackers burn more when set off. Sufficient, less residues after combustion (the burned part has been decomposed into carbon dioxide and water), and the organic matter of the present invention is not easy to pulverize into smoke and dust during combustion, so it has excellent environmental protection properties. (8) Fire paper is flammable but will burn out very quickly. It can be used as a fire. Activated carbon is flammable and has strong thermal conductivity. It can transfer the high temperature of the fire paper to the primary combustion layer, and at the same time, it continuously acts as a heat source in the form of sparks. Initiate new combustion and promote more complete combustion, and then the primary combustion layer will burn violently because of its own combustion-supporting agent (oxidation), resulting in primary injection and high temperature, melting and burning the sealing layer, releasing the high-pressure explosion gas inside it, and performing secondary Vigorous combustion and high-pressure gas explosion, rich burst levels, good sound and light effects. (9) The burst drive of the present invention is mainly the gas expansion produced by thermal energy and the original pressure injection, and the source of the color light is the natural flame color of the metal ions in the organic salt, and the setting effect is the same as that of conventional firecrackers instead of the simulated sound and color of electronic firecrackers , More atmospheric, and safer than conventional firecrackers and electronic firecrackers (mainly anti-shock structure requirements, electrical clearance and creepage distance, electrical strength, power connection and external cords, plug type and size, etc.). Therefore, the invention has the characteristics of good bursting effect, green raw materials and no pollution, long-lasting light flame, self-ignition, and harmless combustion.

Beneficial effect

The beneficial effect of the present invention is an environmentally friendly firecracker with good bursting effect, green raw materials and no pollution, long-lasting light flame, self-ignition, and harmless combustion.

Description of the drawings

Type the description of the figure description here.

The best mode of the invention

An environmentally friendly firecracker with a long-lasting flame and self-ignition. The environmentally friendly firecracker includes five structural layers from the outside and the inside, namely a fixed structure, a gas film layer, a primary combustion layer, a sealing layer, and a high-pressure burst layer; the fixed structure is specifically ethylene An EAA mesh layer copolymerized with acrylic acid in a mass ratio of 2:3. The mesh layer is specifically a mesh basket fixed on the outer surface of the gas film layer with a mesh gap of 1.5 mm; the gas film layer is specifically 5-ethylene-2 -Norbornene, ethylene, and propylene are non-vulcanized EPDM rubber film copolymerized at a mass ratio of 1:10:9; the primary combustion layer is specifically methane and oxygen mixed at a volume ratio of 1:1 to form a pressure of 1.1 times the atmospheric pressure A mixed layer mixed with solid organic salts sodium acrylate, calcium acrylate, and methyl potassium; the sealing layer is specifically divided into three parts, and the three parts are physically combined with each other, and the three parts are specifically reinforcement, stabilizer and degradation Promoter, they are the sealing layer after being mixed according to the mass ratio of 8:1.8:0.2, the reinforcement is EAA copolymerized with ethylene and acrylic acid in a mass ratio of 7:3, and the stabilizer is specifically 5-ethylene-2-norbornane The non-vulcanized EPDM rubber copolymerized with ethylene, ethylene and propylene in a mass ratio of 1:10:9, the degradation accelerator is sodium peroxide powder; the high-pressure burst layer is specifically a mixture of methane and oxygen in a volume ratio of 1:1 A mixed gas layer mixed with solid organic salts sodium acrylate, calcium acrylate, and potassium methyl acrylate is formed after 7 times the atmospheric pressure.

　　The manufacturing method of the above-mentioned long-lasting self-ignition environmentally friendly firecrackers includes the following steps:

　　1) Raw material preparation

　　2) Manufacturing of structures

②Polymerize ethylene and acrylic acid according to the mass ratio of 2:3 and extrude them into EAA wire with a diameter of 1.5mm. Weave the obtained EAA wire into a net basket structure with a grid gap of 1.5mm according to the required size of the firecracker. Net basket

③Polymerize ethylene and acrylic acid into EAA according to the mass ratio of 7:3. When EAA is still in the molten pool state, mix the unvulcanized EPDM rubber prepared in step ① and the sodium peroxide powder prepared in step ① In the molten pool and stir evenly, the mixing ratio is calculated as EAA/non-vulcanized EPDM rubber to be used/sodium peroxide powder 8/1.8/0.2 according to the mass ratio; the molten pool after mixing is injection molded into a hollow shell , The external volume of the hollow formwork is 1/2 of the required external volume of firecrackers;

④Mix methane and oxygen in a volume ratio of 1:1, and then mix with the solid organic salt powders of sodium acrylate, calcium acrylate, and methyl potassium with a mass ratio of 1:1:1 with a total mass of 0.1% of the gas mass. Inject into a gas transmission device equipped with a gas pressure detection device as raw material A; use 50% potassium hydroxide hydrothermal solution as raw material B, and the hydrothermal solution is specifically an aqueous solution with a temperature of 80°C;

⑤In a vacuum environment, use a needle-type syringe to extract the air in the hollow mold shell obtained in step ③, and then use an air delivery device equipped with an air pressure detection device to inject into the hollow mold shell through a thin hollow needle with a diameter of 0.3 mm. Step ④ When the air pressure in the hollow mold shell rises to 7 times the atmospheric pressure, then slowly withdraw the thin-diameter hollow needle until the tip of the thin-diameter hollow needle is in contact with the entity in the hollow mold shell and begins to instill slowly. Step ④ For raw material B, the pinholes are melt-sealed and hardened at the pinholes to obtain a composite high-pressure burst layer with a sealing layer for use;

　　3) Manufacture of environmentally friendly firecrackers

① Put the composite high-pressure bursting layer of the sealing layer to be used obtained in step 2) in step ⑤ in the gas film layer to be used in step 2), and cover the outer surface of the gas film layer to be used in step 2). Use a mesh basket, and then inject the air pressure 1.1 times into the gas film layer to be used in stage 2) Step ④ The raw material A obtained until the outer wall of the gas film layer to be used and the inner wall of the basket to be used closely fit, and then stage 1) step ①The prepared fire paper solid core roll containing activated carbon powder is inserted into the open end, and the joint between the open end and the fire paper solid core core is sealed with paraffin to obtain prefabricated firecrackers;

Note: The optional range of solid organic salts includes organics containing potassium, copper, and calcium, such as methyl potassium, copper pyridine acetate, calcium acrylate, etc., and solid organic salts containing corresponding metal elements are selected according to the required flame color. Among them, potassium It is purple, sodium is yellow (the invention comes with it and does not need to be added through solid organic salts), copper is blue-green (offset between blue and green depending on the price), and calcium is red. (The same below, will not repeat)

Embodiments of the invention

Example 2

　　The whole is consistent with Example 1, the difference lies in:

The primary combustion layer is specifically a mixture of methane and oxygen in a volume ratio of 1:1 to form a mixed layer with a pressure of 1.2 times the atmospheric pressure and then mixed with the solid organic salt methyl sodium, copper pyridine acetate and potassium acrylate; the high pressure burst layer is specifically methane It is mixed with oxygen in a volume ratio of 1:1 to form a mixed gas layer that is 8 times the atmospheric pressure and mixed with solid organic salt methyl sodium, copper pyridine acetate and potassium acrylate.

　　2) Manufacturing of structures

②Polymerize ethylene and acrylic acid according to the mass ratio of 2:3 and extrude them into EAA filaments with a diameter of 2mm. Weave the obtained EAA filaments into a mesh basket structure with a grid gap of 1mm according to the required firecracker dimensions to obtain a ready-to-use net. basket;

③Polymerize ethylene and acrylic acid into EAA according to the mass ratio of 7:3. When EAA is still in the molten pool state, mix the unvulcanized EPDM rubber prepared in step ① and the sodium peroxide powder prepared in step ① In the molten pool and stir evenly, the mixing ratio is calculated as EAA/non-vulcanized EPDM rubber to be used/sodium peroxide powder 8/1.8/0.2 according to the mass ratio; the molten pool after mixing is injection molded into a hollow shell , The outline volume of the hollow formwork is 2/3 of the required firecracker outline volume;

④Mix methane and oxygen in a volume ratio of 1:1, and then mix with solid organic salt powders with a mass ratio of 1:1:1 with solid organic salt powder with a total mass of 0.3% of the gas mass, copper pyridine acetate, and potassium acrylate. , Injected into a gas transmission device equipped with a gas pressure detection device as raw material A; using 60% potassium hydroxide hydrothermal solution as raw material B, and the hydrothermal solution is specifically an aqueous solution with a temperature of 90°C;

⑤In a vacuum environment, use a needle-type syringe to extract the air in the hollow mold shell obtained in step ③, and then use an air delivery device equipped with an air pressure detection device to inject into the hollow mold shell through a thin hollow needle with a diameter of 0.2 mm. Step ④ When the air pressure in the hollow mold shell rises to 8 times the atmospheric pressure, then slowly withdraw the thin-diameter hollow needle until the needle tip of the thin-diameter hollow needle is in contact with the entity in the hollow mold shell. For raw material B, the pinholes are melt-sealed and hardened at the pinholes to obtain a composite high-pressure burst layer with a sealing layer for use;

　　3) Manufacture of environmentally friendly firecrackers

① Put the composite high-pressure bursting layer of the sealing layer to be used obtained in step 2) in step ⑤ in the gas film layer to be used in step 2), and cover the outer surface of the gas film layer to be used in step 2). Use a mesh basket, and then inject the air pressure 1.2 times into the gas film layer to be used in stage 2) Step ④ The raw material A obtained until the outer wall of the gas film layer to be used and the inner wall of the basket to be used are closely attached, and then stage 1) step ①The prepared fire paper solid core roll containing activated carbon powder is inserted into the open end, and the joint between the open end and the fire paper solid core core is sealed with paraffin to obtain prefabricated firecrackers;

Industrial applicability

Type a paragraph describing industrial applicability here.

Sequence Listing Free Content

The above description of the disclosed embodiments is only to enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

In a method for manufacturing environmentally friendly firecrackers with long-lasting self-ignition, it is characterized by comprising the following steps:

　　1) Raw material preparation

　　①Prepare enough methane, oxygen, 5-ethylidene-2-norbornene, ethylene, propylene, acrylic acid, sodium peroxide powder, a solid core of fire paper wrapped with activated carbon powder, and paraffin wax;

　　2) Manufacturing of structures

　　① Polymerize 5-ethylidene-2-norbornene, ethylene, and propylene at a mass ratio of 1:10:9, and leave it for use without vulcanization to obtain a ready-to-use non-vulcanized EPDM rubber;

②Polymerize ethylene and acrylic acid according to the mass ratio of 2:3 and extrude them into EAA wire with a diameter of 1.5mm-2mm, and weave the obtained EAA wire into a mesh basket with a grid gap of 1mm-1.5mm according to the required firecracker outline size Structure, get ready-to-use basket;

③Polymerize ethylene and acrylic acid into EAA according to the mass ratio of 7:3. When EAA is still in the molten pool state, mix the unvulcanized EPDM rubber prepared in step ① and the sodium peroxide powder prepared in step ① In the molten pool and stir evenly, the mixing ratio is calculated as EAA/non-vulcanized EPDM rubber to be used/sodium peroxide powder 8/1.8/0.2 according to the mass ratio; the molten pool after mixing is injection molded into a hollow shell , The outline volume of the hollow formwork is 1/2-2/3 of the required firecracker outline volume;

④Mix methane and oxygen in a volume ratio of 1:1, then mix with solid organic salt powder with a total mass of 0.1%-0.3% of the gas mass, and inject it into a gas transmission device equipped with a gas pressure detection device as raw material A; Potassium hydroxide hydrothermal solution with a fraction of 50%-60% is used as raw material B, and the hydrothermal solution is specifically an aqueous solution with a temperature of 80°C to 90°C;

⑤Use a needle syringe to extract the air in the hollow mold shell obtained in step ③ in a vacuum environment, and then use an air delivery device equipped with a pressure detection device to inject into the hollow mold shell through a small diameter hollow needle with a diameter of 0.2mm-0.3mm Step ④ The obtained raw material A, until the air pressure in the hollow mold shell rises to 7 to 8 times atmospheric pressure, and then slowly withdraw the thin hollow needle until the tip of the thin hollow needle retreats to contact with the entity in the hollow mold shell. For the raw material B obtained in the dripping step ④, the pinholes are melt-sealed and the pinholes are hardened to obtain a composite high-pressure burst layer with a sealing layer to be used;

　　⑥The unvulcanized EPDM rubber to be used obtained in step ① is injection molded into a balloon-shaped hollow unilateral opening film that is compatible with the inner wall of the basket obtained in step ② to obtain a gas film layer to be used;

　　3) Manufacture of environmentally friendly firecrackers

① Put the composite high-pressure bursting layer of the sealing layer to be used obtained in step 2) in step ⑤ in the gas film layer to be used in step 2), and cover the outer surface of the gas film layer to be used in step 2). Use a mesh basket, and then inject the air pressure 1.1-1.2 times into the air film layer to be used in stage 2) Step ④ The raw material A obtained until the outer wall of the air film layer to be used is tightly attached to the inner wall of the basket to be used, and then stage 1 ) In step ①, the prepared fire paper solid core that is mixed and wrapped with activated carbon powder is inserted into the open end, and the joint between the open end and the fire paper solid core is sealed with paraffin to obtain prefabricated firecrackers;

②Pack and paint the prefabricated firecrackers obtained in step ① to obtain the environmentally friendly firecrackers with long-lasting self-ignition. 2. The method for manufacturing environmentally friendly firecrackers with long-lasting self-ignition according to claim 1, wherein the solid organic salts are specifically organic substances containing potassium, copper, and calcium, and the selected ones are based on the required flame color requirements. Corresponding to solid organic salts of metal elements.
3. The long-lasting self-ignition environmental firecrackers manufactured by the method of claim 1, characterized in that: the environmental firecrackers include five structural layers from the outside and the inside, which are a fixed structure, a gas film layer, a primary combustion layer, Sealing layer, high-pressure burst layer; the fixed structure is specifically an EAA grid layer copolymerized with ethylene and acrylic acid in a 2:3 mass ratio, and the grid layer is specifically fixed on the outer surface of the gas film layer with a grid gap of 1mm-1.5mm Mesh basket; the gas film layer is specifically a non-vulcanized EPDM rubber film copolymerized with 5-ethylidene-2-norbornene, ethylene and propylene in a mass ratio of 1:10:9; the primary combustion layer is specifically methane and oxygen Mix in a volume ratio of 1:1 to form a mixed layer with a pressure of 1.1 to 1.2 times the atmospheric pressure and then mix with solid organic salt; the sealing layer is specifically divided into three parts, the three parts are physically combined with each other, the three parts Specifically, they are reinforcements, stabilizers, and degradation promoters. They are mixed at a mass ratio of 8:1.8:0.2 to become the sealing layer. The reinforcement is EAA copolymerized with ethylene and acrylic acid at a mass ratio of 7:3, and the stabilizer is specifically 5. -Ethylene-2-norbornene, ethylene, and propylene are non-vulcanized EPDM rubber copolymerized at a mass ratio of 1:10:9, and the degradation accelerator is sodium peroxide powder; the high-pressure burst layer is specifically methane and Oxygen is mixed in a volume ratio of 1:1 to form a mixed gas layer mixed with solid organic salt after 7 times to 8 times atmospheric pressure.
The long-lasting self-ignition environmentally friendly firecrackers according to claim 3, wherein the solid organic salts are specifically organic substances containing potassium, copper, and calcium, and those containing corresponding metal elements are selected according to the required flame color requirements. Solid organic salt.

To