Paint type aviation high-voltage explosion-proof ignition wire and preparation method thereof

Abstract

The invention belongs to the technical field of aerospace equipment cables, and provides a painting type aviation high-voltage explosion-proof ignition wire and a preparation method thereof.The ignition wire comprises a conductor, an insulating layer, a temperature-resistant layer and an explosion-proof layer; the conductor is located in the center of the cable; the insulating layer wraps the outer side of the conductor; the temperature-resistant layer consists of two layers of glass fiber woven meshes and is positioned on the outer side of the insulating layer; the sides, away from the axis, of the two layers of glass fiber woven meshes are each coated with a layer of high-temperature insulating paint. And the explosion-proof layer is clamped between the two layers of woven meshes. The high-temperature insulating paint is prepared from the following components in parts by weight: 55 to 65 parts of organic silicon resin 1153, 55 to 65 parts of epoxy resin, 8 to 12 parts of chlorinated polyethylene E0904, 12 to 18 parts of polyamide 651, 20 to 30 parts of phenolic aldehyde amine T-31, 20 to 30 parts of xylene, 2 to 4 parts of silane coupling agent KH-550 and 8 to 12 parts of quartz powder.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace equipment cables, and particularly relates to a paint-coated aviation high-voltage explosion-proof ignition wire and a preparation method thereof. Background Art

[0002] The high-voltage wire is a high-voltage cable that connects the ignition device and the spark plug in the ignition system. Its main function is to transmit high-voltage current from the ignition device to the spark plug, ensuring that the spark plug can properly ignite the fuel and air mixture.

[0003] In existing technology, high-voltage ignition wires are often produced using a painting process, which has a long production cycle and slow product delivery. Furthermore, aircraft interiors are subject to significant electromagnetic interference, and existing products lack a specific structure to address this issue. Therefore, a high-voltage, explosion-proof ignition wire with a shorter production cycle was needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a painted aviation high-voltage explosion-proof ignition wire and a preparation method thereof, so as to solve the problems of long production cycle of high-voltage wires in the prior art (i.e. long drying time of the paint) and lack of explosion-proof structure.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A first aspect of the present invention provides a painted aviation high-voltage explosion-proof ignition wire, which includes a conductor, an insulation layer, a heat-resistant layer and an explosion-proof layer; the conductor is located in the center of the cable; the insulation layer is wrapped around the outside of the conductor; the heat-resistant layer is composed of two layers of glass fiber braided mesh, which is located on the outside of the insulation layer; the two layers of glass fiber braided mesh are coated with a layer of high-temperature insulating paint on the side away from the axis; the explosion-proof layer is sandwiched between the two layers of braided mesh.

[0006] Preferably, the high-temperature insulating varnish comprises the following components in parts by weight: Silicone resin 1153: 55-65 parts, epoxy resin: 55-65 parts, chlorinated polyethylene E0904: 8-12 parts, polyamide 651: 12-18 parts, phenalkamine T-31: 20-30 parts, xylene: 20-30 parts, silane coupling agent KH-550: 2-4 parts, quartz powder: 8-12 parts.

[0007] Preferably, the preparation method of the high temperature insulating varnish is as follows: Add silicone resin 1153 and epoxy resin to the reactor in proportion by weight, heat to 60-70°C and stir for 1 hour to form a uniform resin matrix, add chlorinated polyethylene E0904 and xylene, and stir until completely dissolved; premix silane coupling agent KH-550 with quartz powder, slowly add to the reactor, and use a high-speed disperser to disperse at a speed of 2000-3000 rpm for 40-60 minutes to ensure uniform distribution of the filler, cool to 30-40°C, add polyamide 651 and phenolic amine T-31 in turn, stir at a low speed of 500-800 rpm, and stir for 15-20 minutes; filter the paint liquid through a 200-mesh filter to remove impurities, and seal and store away from light for later use.

[0008] Preferably, the curing coating method of the high temperature insulating varnish is as follows: Apply high-temperature insulating paint evenly on the surface of the glass fiber woven mesh. The coating thickness should be controlled at 0.1-0.15 mm. Allow it to dry on the surface for 1-2 hours and actually dry for 24 hours in an environment of 25-30℃ and humidity ≤50%.

[0009] Preferably, the organic silicone resin 1153 comprises the following components in parts by weight: 5 parts of dimethyldichlorosilane, 4.5 parts of phenyltrichlorosilane, ≤0.003 parts of zinc octoate, 1.0-1.4 parts of water, and 5-7 parts of xylene.

[0010] Preferably, the preparation method of the silicone resin 1153 is as follows: Add dimethyldichlorosilane, phenyltrichlorosilane, and deionized water to a reaction kettle in proportions by weight, stir, and maintain the temperature at 50-60°C for 1-2 hours until the chlorine content drops to the target value (monitored by titration). Add xylene as a cosolvent, raise the temperature to 80-90°C, and slowly add zinc octoate catalyst dropwise. Continue the reaction for 3-4 hours until the system viscosity reaches 2000-3000 mPa·s. Cool to room temperature and filter to obtain silicone resin 1153.

[0011] Preferably, the chlorine content in the dimethyldichlorosilane is 50% to 55%.

[0012] Preferably, the chlorine content in the phenyltrichlorosilane is 50% to 55%.

[0013] Preferably, the epoxy resin is formed by mixing epoxy resin E51 and epoxy resin E44 in a ratio of 20 to 30:80 to 70. Compounding epoxy resin E51 and epoxy resin E44 can effectively improve the temperature resistance of the material.

[0014] Preferably, the preparation method of the epoxy resin is as follows: Epoxy resin E51 and E44 were mixed in proportion, and stirred at 40-50° C. for 30 min to fully dissolve the two epoxy resins to obtain epoxy resin.

[0015] Preferably, the conductor consists of a central copper-plated stainless steel wire and six surrounding pure copper wires.

[0016] Preferably, the insulating layer is formed by wrapping 21 layers of F4 film.

[0017] Preferably, the explosion-proof layer is formed by wrapping copper tape.

[0018] A second aspect of the present invention provides a method for preparing a painted aviation high-voltage explosion-proof ignition wire, comprising the following steps: S1. Conductor stranding: Six pure copper wires around a central copper-plated stainless steel wire are stranded at 12 to 14 times the pitch; S2, Insulation: from inside to outside: 0.035×6 four layers, 0.035×8 four layers, 0.05×8 four layers, 0.05×9 two layers, 0.05×10 two layers, 0.05×12 two layers, 0.05×13 three layers, covering the conductor in sequence with 60% to 70%; S3, first weaving: use 80S / 2 specification glass yarn with a weaving density of 96% and evenly weave it on the surface of the insulation layer; S4, shield wrapping: Use 20mm wide and 0.1mm thick pure copper tape to wrap around the outside of the braid with a 30% overlap rate; S5. Second weaving: Use 80S / 2 specification glass fiber to weave evenly on the surface of the copper belt with a weaving density of 90%.

[0019] Beneficial effects of the present invention: 1. The present invention places the copper-plated stainless steel wire (i.e., the reinforcing conductor) in the center of the entire cable to enhance the mechanical properties. Together with the surrounding pure copper wires, it can also transmit electrical energy through the skin effect.

[0020] 2. The insulation layer of the ignition wire of the present invention is made of F4 film, mainly utilizing its temperature resistance and voltage resistance. The use of multi-layer wrapping can significantly improve the high temperature resistance and insulation performance of the insulation layer, and increasing the number of wrapping layers can fill the gaps and holes on the insulation layer, so that the wires and cables can work better in complex electromagnetic environments.

[0021] 3. The heat-resistant layer of the ignition wire of the present invention adopts a glass fiber woven and painted structure, which has extremely strong heat resistance and also has certain insulation properties.

[0022] 4. The copper tape wrapping has explosion-proof properties to shield external interference.

[0023] 5. The high-temperature insulating paint provided in the present invention greatly shortens the production cycle compared to traditional paints. Originally, it took at least 5 days to dry 500 meters of product before entering the next process. The improved high-temperature insulating paint provided in the present invention only requires 1 day to wait, which is mainly reflected in the faster curing speed of the paint.

[0024] 6. The present invention provides a painted aviation high-voltage explosion-proof ignition wire that can operate in an environment of -60°C to 250°C for a long time through the use of a paint film and a cable structure; at the same time, it can withstand a high temperature of 360°C and a voltage of 35kV in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 It is a structural schematic diagram of a paint-coated aviation high-voltage explosion-proof ignition wire of the present invention.

[0027] In the figure: 1. Conductor; 2. Insulation layer; 3. Explosion-proof layer; 4. Heat-resistant layer; 11. Copper-plated stainless steel wire; 12. Pure copper wire. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] The present invention provides a painted aviation high-voltage explosion-proof ignition wire and a preparation method thereof: A painted aviation high-voltage explosion-proof ignition wire, comprising a conductor 1, an insulating layer 2, a heat-resistant layer 4, and an explosion-proof layer 3; the conductor 1 is located in the center of the cable; the insulating layer 2 is wrapped around the outside of the conductor 1, and the heat-resistant layer 4 is composed of two layers of glass fiber braided mesh and is located outside the insulating layer 2; the two layers of glass fiber braided mesh are coated with a layer of high-temperature insulating varnish on the side away from the axis; the explosion-proof layer 3 is sandwiched between the two layers of braided mesh; the conductor 1 is composed of a central copper-plated stainless steel wire 11 and six surrounding pure copper wires 12; the insulating layer 2 is wrapped with 21 layers of F4 film; and the explosion-proof layer 3 is wrapped with copper tape.

[0030] The high-temperature insulating varnish comprises the following raw materials in parts by weight: Silicone resin 1153: 55-65 parts, epoxy resin (the ratio of epoxy resin E51 to epoxy resin E44 is 20-30:80-70): 55-65 parts, chlorinated polyethylene E0904: 8-12 parts, polyamide 651: 12-18 parts, phenolic amine T-31: 20-30 parts, xylene: 20-30 parts, silane coupling agent KH-550: 2-4 parts, quartz powder: 8-12 parts.

[0031] The organic silicone resin 1153 includes the following raw materials in parts by weight: 5 parts of dimethyldichlorosilane (chlorine content is 50% to 55%), 4.5 parts of phenyltrichlorosilane (chlorine content is 50% to 55%), ≤0.003 parts of zinc octoate, 1.0 to 1.4 parts of water, and 5 to 7 parts of xylene.

[0032] The preparation method of the high-temperature insulating varnish and the curing coating method are as follows: Add silicone resin 1153 and epoxy resin to the reactor in proportion by weight, heat to 60-70°C and stir for 1 hour to form a uniform resin matrix, add chlorinated polyethylene E0904 and xylene, and stir until completely dissolved; premix silane coupling agent KH-550 with quartz powder, slowly add to the reactor, and use a high-speed disperser to disperse at a speed of 2000-3000 rpm for 40-60 minutes to ensure uniform distribution of the filler, cool to 30-40°C, add polyamide 651 and phenolic amine T-31 in turn, stir at a low speed of 500-800 rpm, and stir for 15-20 minutes; filter the paint liquid through a 200-mesh filter to remove impurities, and seal and store away from light for later use.

[0033] Curing coating method of high temperature insulating varnish: Apply high-temperature insulating varnish evenly on the surface of the glass fiber woven mesh, and control the coating thickness to 0.1-0.15 mm; dry it on the surface for 1-2 hours and actually dry it for 24 hours in an environment of 25-30℃ and humidity ≤50%.

[0034] The preparation method of the silicone resin 1153 is as follows: Add dimethyldichlorosilane, phenyltrichlorosilane, and deionized water to a reaction kettle in proportions by weight, stir, and maintain the temperature at 50-60°C for 1-2 hours until the chlorine content drops to the target value (monitored by titration). Add xylene as a cosolvent, raise the temperature to 80-90°C, and slowly add zinc octoate catalyst dropwise. Continue the reaction for 3-4 hours until the system viscosity reaches 2000-3000 mPa·s. Cool to room temperature and filter to obtain silicone resin 1153.

[0035] Wherein, the preparation method of epoxy resin is as follows: Epoxy resin E51 and E44 were mixed in proportion, and stirred at 40-50° C. for 30 min to fully dissolve the two epoxy resins to obtain epoxy resin.

[0036] A method for preparing a painted aviation high-voltage explosion-proof ignition wire comprises the following steps: S1. Conductor stranding: Six pure copper wires around a central copper-plated stainless steel wire are stranded at 12 to 14 times the pitch; S2, Insulation: From the inside out, 0.035×6 four layers, 0.035×8 four layers, 0.05×8 four layers, 0.05×9 two layers, 0.05×10 two layers, 0.05×12 two layers, 0.05×13 three layers, covering the conductor in 60% to 70% order; (0.035×6 represents film thickness × film width) S3, first weaving: use 80S / 2 specification glass yarn with a weaving density of 96% and evenly weave it on the insulation surface; S4, shield wrapping: Use 20mm wide and 0.1mm thick pure copper tape to wrap around the outside of the braid with a 30% overlap rate; S5. Second weaving: Use 80S / 2 specification glass fiber to weave evenly on the surface of the copper belt with a weaving density of 90%.

[0037] The performance testing methods in the embodiments and comparative examples of the present invention are as follows: 1) Withstand voltage test: Immerse the finished product in water and subject it to an AC 50Hz, 35kV voltage test. The voltage test should be carried out in accordance with the AC voltage test regulations in GB / T 3048.8-2007, and the test time is 5 minutes.

[0038] 2) Temperature resistance test: Low temperature test: according to GB / T 2423.1-2008, condition -60℃, time is 72h; High temperature test: according to GB / T 2423.2-2008, condition 250℃, time is 72h; Short-time temperature resistance test: according to GJB 150.3A-2009, condition 360℃, time 1h.

[0039] Example 1 This embodiment provides a painted aviation high-voltage explosion-proof ignition wire and a preparation method thereof: A painted aviation high-voltage explosion-proof ignition wire, comprising a conductor 1, an insulating layer 2, a heat-resistant layer 4, and an explosion-proof layer 3; the conductor 1 is located in the center of the cable; the insulating layer 2 is wrapped around the outside of the conductor 1, and the heat-resistant layer 4 is composed of two layers of glass fiber braided mesh and is located outside the insulating layer 2; the two layers of glass fiber braided mesh are coated with a layer of high-temperature insulating varnish on the side away from the axis; the explosion-proof layer 3 is sandwiched between the two layers of braided mesh; the conductor 1 is composed of a central copper-plated stainless steel wire 11 and six surrounding pure copper wires 12; the insulating layer 2 is wrapped with 21 layers of F4 film; and the explosion-proof layer 3 is wrapped with copper tape.

[0040] The high-temperature insulating varnish comprises the following raw materials in parts by weight: Silicone resin 1153: 55 parts, epoxy resin (the ratio of epoxy resin E51 to epoxy resin E44 is 20:80): 55 parts, chlorinated polyethylene E0904: 8 parts, polyamide 651: 12 parts, phenolic amine T-31: 20 parts, xylene: 20 parts, silane coupling agent KH-550: 2 parts, quartz powder: 8 parts.

[0041] The organic silicone resin 1153 includes the following raw materials in parts by weight: 5 parts of dimethyldichlorosilane (chlorine content is 50%), 4.5 parts of phenyltrichlorosilane (chlorine content is 50%), zinc octoate ≤ 0.003 parts, 1.0 part of water, and 5 parts of xylene.

[0042] The preparation method of the high-temperature insulating varnish and the curing coating method are as follows: Add silicone resin 1153 and epoxy resin into the reactor in proportion by weight, heat to 60°C and stir for 1 hour to form a uniform resin matrix, add chlorinated polyethylene E0904 and xylene, and stir until completely dissolved; premix silane coupling agent KH-550 with quartz powder, slowly add to the reactor, and use a high-speed disperser to disperse at a speed of 2000 rpm for 60 minutes to ensure uniform distribution of the filler, cool to 30°C, add polyamide 651 and phenolic amine T-31 in turn, stir at a low speed of 500 rpm for 20 minutes; filter the paint liquid through a 200-mesh filter to remove impurities, and seal and store away from light for later use.

[0043] The preparation method of the silicone resin 1153 is as follows: Dimethyldichlorosilane, phenyltrichlorosilane, and deionized water were added to a reaction kettle in a proportioned ratio by weight and stirred. Stirring was continued at 50°C for 2 hours until the chlorine content dropped to the target value (determined by titration). Xylene was added as a cosolvent, the temperature was raised to 80°C, and zinc octoate catalyst was slowly added dropwise. The reaction was continued for 3 hours until the system viscosity reached 2000-3000 mPa·s. The mixture was cooled to room temperature and filtered to obtain silicone resin 1153.

[0044] Wherein, the preparation method of epoxy resin is as follows: Epoxy resin E51 and E44 were mixed in proportion, and stirred at 40-50° C. for 30 min to fully dissolve the two epoxy resins to obtain epoxy resin.

[0045] A method for preparing a painted aviation high-voltage explosion-proof ignition wire comprises the following steps: S1. Conductor stranding: Six pure copper wires around a central copper-plated stainless steel wire are stranded at 12 to 14 times the pitch; S2, Insulation: From the inside out, 0.035×6 four layers, 0.035×8 four layers, 0.05×8 four layers, 0.05×9 two layers, 0.05×10 two layers, 0.05×12 two layers, 0.05×13 three layers, covering the conductor in 60% to 70% order; (0.035×6 represents film thickness × film width) S3, first weaving: use 80S / 2 specification glass yarn with a weaving density of 96% and evenly weave it on the insulation surface; S4, shield wrapping: Use 20mm wide and 0.1mm thick pure copper tape to wrap around the outside of the braid with a 30% overlap rate; S5. Second weaving: Use 80S / 2 specification glass fiber to weave evenly on the surface of the copper belt with a weaving density of 90%.

[0046] Paint drying time: 1 day.

[0047] Withstand voltage test: passed the withstand voltage test.

[0048] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation (electrical performance refers to 35kV voltage test).

[0049] Example 2 Compared with Example 1, the only difference is: The amount of silicone resin 1153 was adjusted to 65 parts, and the amount of epoxy resin was adjusted to 65 parts.

[0050] Paint drying time: 1 day.

[0051] Withstand voltage test: passed the withstand voltage test.

[0052] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0053] Example 3 Compared with Example 1, the only difference is: The amount of polyamide 651 was adjusted to 15 parts.

[0054] Paint drying time: 1 day.

[0055] Withstand voltage test: passed the withstand voltage test.

[0056] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0057] Example 4 Compared with Example 1, the only difference is: Adjust the amount of quartz powder to 10 parts.

[0058] Paint drying time: 1 day.

[0059] Withstand voltage test: passed the withstand voltage test.

[0060] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0061] Example 5 Compared with Example 1, the only difference is: The amount of epoxy resin E51 in the epoxy resin was adjusted to 30 parts, and the amount of epoxy resin E44 was adjusted to 70 parts.

[0062] Paint drying time: 1 day.

[0063] Withstand voltage test: passed the withstand voltage test.

[0064] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0065] Example 6 Compared with Example 1, the only difference is: The amount of epoxy resin E51 in the epoxy resin was adjusted to 22 parts, and the amount of epoxy resin E44 was adjusted to 78 parts.

[0066] Paint drying time: 1 day.

[0067] Withstand voltage test result: passed the withstand voltage test.

[0068] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0069] Example 7 Compared with Example 1, the only difference is: The chlorine content of dimethyldichlorosilane was adjusted to 55%, and the chlorine content of phenyltrichlorosilane was adjusted to 55%.

[0070] Paint drying time: 1 day.

[0071] Withstand voltage test: passed the withstand voltage test.

[0072] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0073] Example 8 Compared with Example 1, the only difference is: The high-temperature insulating varnish comprises the following raw materials in parts by weight: Silicone resin 1153: 60 parts, epoxy resin (the ratio of epoxy resin E51 to epoxy resin E44 is 25:75): 60 parts, chlorinated polyethylene E0904: 10 parts, polyamide 651: 15 parts, phenolic amine T-31: 25 parts, xylene: 25 parts, silane coupling agent KH-550: 3 parts, quartz powder: 10 parts.

[0074] Paint drying time: 1 day.

[0075] Withstand voltage test result: passed the withstand voltage test.

[0076] Low-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; high-temperature test results: The product surface has no damage, deformation or other defects, and the paint film has no brittleness, shrinkage or cracking; short-term heat resistance test results: The insulation layer, conductor, and coating do not carbonize, peel off, or have electrical performance degradation.

[0077] Comparative Example 1 Compared with Example 1, the only difference is: The amount of epoxy resin was adjusted to 50 parts; the amount of silicone resin 1153 was adjusted to 70 parts.

[0078] Paint drying time: 1 day.

[0079] Withstand voltage test result: breakdown occurred in 3 minutes and failed the withstand voltage test.

[0080] As can be seen from the above, when the ratio of epoxy resin to silicone resin 1153 in Comparative Example 1 is 1:1, which exceeds the dosage range specified in the present invention, the voltage withstand capability is poor. This shows that the ratio of epoxy resin to silicone resin 1153 affects the adhesion of the paint film, which in turn affects the paint thickness, thereby affecting the voltage withstand capability.

[0081] Comparative Example 2 Compared with Example 1, the only difference is: The amount of polyamide 651 was adjusted to 22 parts.

[0082] Paint drying time: 1 day.

[0083] Temperature resistance test results: After the 360℃ short-term temperature resistance test, the coating carbonized and failed the test; after the long-term high and low temperature resistance test, the coating bubbled and failed the test.

[0084] Comparative Example 3 Compared with Example 1, the only difference is: The amount of polyamide 651 was adjusted to 9 parts.

[0085] Paint drying time: 3 to 5 days.

[0086] Temperature resistance test results: It is easy to break down when subjected to high temperature voltage resistance and cannot pass the high temperature resistance test.

[0087] Comparative Examples 2 and 3 show that the amount of polyamide 651 used as the curing agent in Comparative Example 2 exceeds the range specified in the present invention, resulting in poor heat resistance. Furthermore, the paint hardens and cracks, making it more susceptible to breakdown during high-temperature withstand voltage tests. In Comparative Example 3, the amount of polyamide 651 used as the curing agent is below the range specified in the present invention, resulting in a longer drying time. This indicates that the amount of curing agent used also affects the drying time of insulating varnishes.

[0088] Comparative Example 4 Compared with Example 1, the only difference is: The amount of quartz powder was adjusted to 15 parts.

[0089] Paint drying time: 1 day.

[0090] Heat resistance test results: In the long-term high temperature resistance test at 250°C, micro cracks began to appear on the coating surface after 24 hours of heat resistance and the coating could not pass the 72-hour test.

[0091] As can be seen from the above, the amount of quartz powder in Comparative Example 4 is higher than the range specified in the present invention, resulting in failure to pass the high temperature resistance test. This shows that the amount of quartz powder filler used will affect the high temperature resistance of the material.

[0092] Comparative Example 5 Compared with Example 1, the only difference is: The amount of epoxy resin E51 in the epoxy resin was adjusted to 40, and the amount of epoxy resin E44 was adjusted to 60.

[0093] Paint drying time: 1 day.

[0094] Temperature resistance test results: In both the 360℃ short-term temperature resistance test and the 250℃ long-term temperature resistance test, coating peeling occurred.

[0095] Comparative Example 6 Compared with Example 1, the only difference is: The amount of epoxy resin E51 in the epoxy resin was adjusted to 10, and the amount of epoxy resin E44 was adjusted to 90.

[0096] Paint drying time: 1 day.

[0097] Temperature resistance test results: In the 360℃ short-time temperature resistance test, it can only withstand 25kV voltage and cannot reach 35kV.

[0098] Comparative Examples 5 and 6 show that the epoxy resin in Comparative Example 5 contains an epoxy resin E51 to epoxy resin E44 ratio of 40:60, meaning the proportion of epoxy resin E51 exceeds 30%. This results in a brittle paint film and causes peeling during short-term heat resistance at 360°C and long-term heat resistance at 250°C. In Comparative Example 6, the epoxy resin ratio of epoxy resin E51 to epoxy resin E44 is 10:90, meaning the proportion of epoxy resin E44 exceeds 80%, resulting in poor heat resistance. This indicates that the ratio of epoxy resin E51 to epoxy resin E44 in an epoxy resin can affect the heat resistance of high-temperature insulating varnishes.

[0099] Comparative Example 7 Compared with Example 1, the only difference is: Only the glass fiber braided structure is retained without applying high-temperature insulating paint.

[0100] Temperature resistance test results: 360℃ short-time temperature resistance test showed obvious carbonization after 30 minutes, and the insulation layer was partially peeled off. 35kV withstand voltage test broke down after 2 minutes.

[0101] Comparative Example 8 Compared with Example 1, the only difference is: Remove the glass wool structure and paint directly on the F4 film insulation.

[0102] Heat resistance test results: After 48 hours of long-term heat resistance test at 250℃, the F4 film shrank and deformed, and the coating bubbled. In the short-term heat resistance test at 360℃, the coating carbonized within 15 minutes, and the insulation layer softened.

[0103] In summary, the use and ratio of raw materials in the preparation of high-temperature insulating paint will affect the voltage resistance and temperature resistance of the high-temperature insulating paint.

[0104] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0105] It should be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. Some or all steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation regulations of this application.

[0106] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0107] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0108] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A painted aviation high-voltage explosion-proof ignition wire, characterized in that: The ignition wire comprises a conductor (1), an insulating layer (2), a heat-resistant layer (4) and an explosion-proof layer (3); the conductor (1) is located in the center of the cable; the insulating layer (2) is wrapped around the outside of the conductor (1); the heat-resistant layer (4) is composed of two layers of glass fiber braided mesh, and is located outside the insulating layer (2); the two layers of glass fiber braided mesh are coated with a layer of high-temperature insulating paint on the side away from the axis; the explosion-proof layer (3) is sandwiched between the two layers of braided mesh; Wherein, the high temperature insulating varnish comprises the following components in parts by weight: Silicone resin 1153: 55-65 parts, epoxy resin: 55-65 parts, chlorinated polyethylene E0904: 8-12 parts, polyamide 651: 12-18 parts, phenalkamine T-31: 20-30 parts, xylene: 20-30 parts, silane coupling agent KH-550: 2-4 parts, quartz powder: 8-12 parts.

2. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The preparation method of the high temperature insulating varnish is as follows: Add silicone resin 1153 and epoxy resin to the reactor in proportion by weight, heat to 60-70°C and stir for 1 hour to form a uniform resin matrix, add chlorinated polyethylene E0904 and xylene, and stir until completely dissolved; premix silane coupling agent KH-550 with quartz powder, slowly add to the reactor, and use a high-speed disperser to disperse at a speed of 2000-3000 rpm for 40-60 minutes to ensure uniform distribution of the filler, cool to 30-40°C, add polyamide 651 and phenolic amine T-31 in turn, stir at a low speed of 500-800 rpm, and stir for 15-20 minutes; filter the paint liquid through a 200-mesh filter to remove impurities, and seal and store away from light for later use.

3. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The organosilicon resin 1153 comprises the following components in parts by weight: 5 parts of dimethyldichlorosilane, 4.5 parts of phenyltrichlorosilane, ≤0.003 parts of zinc octoate, 1.0-1.4 parts of water, and 5-7 parts of xylene.

4. The painted aviation high-voltage explosion-proof ignition wire according to claim 3, characterized in that: The chlorine content in the dimethyldichlorosilane is 50% to 55%; the chlorine content in the phenyltrichlorosilane is 50% to 55%.

5. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The epoxy resin is prepared by mixing epoxy resin E51 and epoxy resin E44 in a ratio of 20-30:80-70.

6. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The conductor (1) consists of a central copper-plated stainless steel wire (11) and six surrounding pure copper wires (12).

7. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The insulating layer (2) is formed by wrapping 21 layers of F4 film.

8. The painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The explosion-proof layer (3) is formed by wrapping a copper tape.

9. The method for preparing a painted aviation high-voltage explosion-proof ignition wire according to claim 1, characterized in that: The following steps are involved: S1. Conductor stranding: six pure copper wires (12) around a central copper-plated stainless steel wire (11) are stranded at 12 to 14 times the pitch; S2, insulation: from inside to outside, 0.035×6 four layers, 0.035×8 four layers, 0.05×8 four layers, 0.05×9 two layers, 0.05×10 two layers, 0.05×12 two layers, 0.05×13 three layers, covering the conductor (1) in order of 60% to 70%; S3, first weaving: using 80S / 2 specification glass yarn and weaving it evenly on the surface of the insulating layer (2) with a weaving density of 96%; S4, shield wrapping: Use 20mm wide and 0.1mm thick pure copper tape to wrap around the outside of the braid with a 30% overlap rate; S5. Second weaving: Use 80S / 2 specification glass fiber to weave evenly on the surface of the copper belt with a weaving density of 90%.

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