High-strength fireproof composite busbar and integrated forming process thereof

Abstract

The invention discloses a high-strength fireproof composite busbar and an integrated forming process thereof, and the high-strength fireproof composite busbar comprises the following components in parts by mass: 40-60 parts of a copper conductor; 20 to 30 parts of ceramic silicone rubber; 10 to 20 parts of nano titanium dioxide modified epoxy resin; 5 to 10 parts of graphene reinforced carbon fiber; 0.5 to 1.5 parts of a fireproof flame retardant; 0.3 to 0.8 part of an antioxidant; 0.3 to 0.7 part of a coupling agent; according to the high-strength fireproof composite busbar, innovative components such as the ceramic silicone rubber, the nano titanium dioxide modified epoxy resin and the graphene reinforced carbon fiber are combined with the copper conductor, so that the composite busbar has excellent fireproof performance; in a high-temperature environment, the ceramic silicone rubber can form a hard ceramic layer, so that flame spreading is effectively prevented; the nano titanium dioxide modified epoxy resin improves the heat resistance and the insulating property of the material; the graphene reinforced carbon fibers significantly enhance the strength and toughness of the busbar.

Description

Technical Field

[0001] This invention relates to the field of busbar technology for electrical equipment, specifically to a high-strength fire-resistant composite busbar and its integrated molding process. Background Technology

[0002] With the continuous development and upgrading of power systems, the performance requirements for power transmission equipment are becoming increasingly stringent. As a key component in power transmission, the performance of busbars directly affects the safe and stable operation of the power system. Traditional busbars often fail to meet fire protection requirements in extreme situations such as fires, easily leading to power system paralysis, causing huge economic losses and safety hazards. At the same time, existing busbars also have limitations in terms of strength, making them unsuitable for complex installation and usage environments. Therefore, developing a composite busbar with high strength and excellent fire resistance, along with its efficient integrated molding process, is of significant practical importance.

[0003] Based on this, a high-strength fireproof composite busbar and its integrated molding process are designed. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength fireproof composite busbar and its integrated molding process to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-strength fire-resistant composite busbar comprises the following components in parts by weight:

[0007] Copper conductor: 40-60 parts;

[0008] Ceramicized silicone rubber: 20-30 parts;

[0009] Nano-titanium dioxide modified epoxy resin: 10-20 parts;

[0010] Graphene-reinforced carbon fiber: 5-10 parts;

[0011] Fire retardant: 0.5-1.5 parts;

[0012] Antioxidant: 0.3-0.8 parts;

[0013] Coupling agent: 0.3-0.7 parts.

[0014] Preferably, the antioxidant is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, 2246 and phosphite antioxidants 168, 618.

[0015] Preferably, the coupling agent is one of a silane coupling agent or a titanate coupling agent.

[0016] Preferably, the preparation method of the nano-titanium dioxide modified epoxy resin is as follows:

[0017] S1. First, add 100 parts of epoxy resin to the reactor and stir evenly at a speed of 100-150 r / min under the condition of 80-100℃.

[0018] S2. Then, slowly add 5-10 parts of surface-treated nano-titanium dioxide powder into the reactor. After the addition is complete, continue to stir at a speed of 100-150 r / min for 2-3 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin.

[0019] S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction for 1-2 hours at a temperature of 120-150℃ to obtain nano-titanium dioxide modified epoxy resin.

[0020] Preferably, in step S2, the preparation step of the surface-treated nano-titanium dioxide powder is as follows:

[0021] ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 2-3 hours at a temperature of 80-100℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface;

[0022] ② Silane coupling agent treatment: Prepare a silane coupling agent ethanol solution with a mass fraction of 1%-3%, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 4-5 with hydrochloric acid;

[0023] The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:10-15mL.

[0024] Under conditions of 40-60℃, stir the reaction at a speed of 200-300r / min for 1-2 hours to fully coat the surface of the nano titanium dioxide powder with the silane coupling agent.

[0025] ③ Post-treatment: The treated nano-titanium dioxide powder is filtered using a Buchner funnel and washed 2-3 times with anhydrous ethanol, each time using 5 times the mass of the powder, to remove unreacted silane coupling agent.

[0026] It was then placed in a vacuum drying oven and dried for 3-4 hours at a temperature of 60-80℃ and a vacuum of -0.09MPa to obtain surface-treated nano-titanium dioxide powder.

[0027] Preferably, the graphene-reinforced carbon fiber is prepared as follows:

[0028] S1. First, immerse the carbon fiber in a nitric acid solution with a mass fraction of 5%-10% and ultrasonically treat it for 30-60 minutes at a temperature of 60-80℃ to activate the surface of the carbon fiber.

[0029] S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 80-100℃.

[0030] S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 200-300 r / min for 3-5 hours at a temperature of 50-70℃ to make the graphene uniformly adhere to the surface of the carbon fiber.

[0031] S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

[0032] Preferably, the fire retardant is prepared by the following method:

[0033] S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous.

[0034] S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants;

[0035] S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C.

[0036] S4. Grind the dried product into powder to obtain the fire retardant.

[0037] An integrated molding process for high-strength fire-resistant composite busbars includes the following steps:

[0038] S1. Raw material preparation

[0039] S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions.

[0040] S1.2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use.

[0041] S2, Mixing and stirring

[0042] S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer. Stir at 300-500 r / min for 30-60 minutes at a temperature of 50-70℃ to ensure that all components are fully mixed.

[0043] S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at a speed of 300-500 r / min for 15-30 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture.

[0044] S3, Molding Processing

[0045] S3.1. Place the mixed material together with the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 120-150℃, and the heating rate is 5℃ / min.

[0046] S3.2 Under a pressure of 10-15MPa, the holding time is 30-60 minutes, and hot pressing is performed to make the material and conductor tightly bonded together to form a composite motherboard blank.

[0047] S4, Post-processing

[0048] S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature.

[0049] S4.2. Grind and polish the surface of the cooled composite busbar to improve its surface quality.

[0050] S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The high-strength fire-resistant composite busbar of this invention combines innovative components such as ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, and graphene-reinforced carbon fiber with copper conductors, giving the composite busbar excellent fire resistance. Under high-temperature environments, the ceramicized silicone rubber can form a hard ceramicized layer, effectively preventing the spread of flames; the nano-titanium dioxide modified epoxy resin improves the material's heat resistance and insulation properties; and the graphene-reinforced carbon fiber significantly enhances the strength and toughness of the busbar.

[0053] 2. The integrated molding process simplifies the production process and improves production efficiency. By integrating mixing, molding and other steps into a continuous process, it reduces material transfer and processing time in intermediate links, and also reduces production costs. Attached Figure Description

[0054] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0055] In the attached diagram:

[0056] Figure 1 A flowchart illustrating an exemplary embodiment of the present invention is shown; Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] This embodiment of a high-strength fireproof composite busbar comprises the following components in parts by weight:

[0059] Copper conductor: 40-60 parts;

[0060] Ceramicized silicone rubber: 20-30 parts;

[0061] Nano-titanium dioxide modified epoxy resin: 10-20 parts;

[0062] Graphene-reinforced carbon fiber: 5-10 parts;

[0063] Fire retardant: 0.5-1.5 parts;

[0064] Antioxidant: 0.3-0.8 parts;

[0065] Coupling agent: 0.3-0.7 parts.

[0066] The antioxidant in this embodiment is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, and 2246, and phosphite antioxidants 168 and 618.

[0067] The coupling agent in this embodiment is either a silane coupling agent or a titanate coupling agent.

[0068] The preparation method of the nano-titanium dioxide modified epoxy resin in this embodiment is as follows:

[0069] S1. First, add 100 parts of epoxy resin to the reactor and stir evenly at a speed of 100-150 r / min under the condition of 80-100℃.

[0070] S2. Then, slowly add 5-10 parts of surface-treated nano-titanium dioxide powder into the reactor. After the addition is complete, continue to stir at a speed of 100-150 r / min for 2-3 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin.

[0071] S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction for 1-2 hours at a temperature of 120-150℃ to obtain nano-titanium dioxide modified epoxy resin.

[0072] In S2 of this embodiment, the preparation steps of the surface-treated nano-titanium dioxide powder are as follows:

[0073] ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 2-3 hours at a temperature of 80-100℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface;

[0074] ② Silane coupling agent treatment: Prepare a silane coupling agent ethanol solution with a mass fraction of 1%-3%, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 4-5 with hydrochloric acid;

[0075] The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:10-15mL.

[0076] Under conditions of 40-60℃, stir the reaction at a speed of 200-300r / min for 1-2 hours to fully coat the surface of the nano titanium dioxide powder with the silane coupling agent.

[0077] ③ Post-treatment: The treated nano-titanium dioxide powder is filtered using a Buchner funnel and washed 2-3 times with anhydrous ethanol, each time using 5 times the mass of the powder, to remove unreacted silane coupling agent.

[0078] It was then placed in a vacuum drying oven and dried for 3-4 hours at a temperature of 60-80℃ and a vacuum of -0.09MPa to obtain surface-treated nano-titanium dioxide powder.

[0079] The preparation method of graphene-reinforced carbon fiber in this embodiment is as follows:

[0080] S1. First, immerse the carbon fiber in a nitric acid solution with a mass fraction of 5%-10% and ultrasonically treat it for 30-60 minutes at a temperature of 60-80℃ to activate the surface of the carbon fiber.

[0081] S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 80-100℃.

[0082] S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 200-300 r / min for 3-5 hours at a temperature of 50-70℃ to make the graphene uniformly adhere to the surface of the carbon fiber.

[0083] S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

[0084] The preparation method of the fire retardant in this embodiment is as follows:

[0085] S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous.

[0086] S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants;

[0087] S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C.

[0088] S4. Grind the dried product into powder to obtain the fire retardant.

[0089] An integrated molding process for high-strength fire-resistant composite busbars includes the following steps:

[0090] S1. Raw material preparation

[0091] S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions.

[0092] S1.2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use.

[0093] S2, Mixing and stirring

[0094] S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer. Stir at 300-500 r / min for 30-60 minutes at a temperature of 50-70℃ to ensure that all components are fully mixed.

[0095] S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at a speed of 300-500 r / min for 15-30 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture.

[0096] S3, Molding Processing

[0097] S3.1. Place the mixed material together with the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 120-150℃, and the heating rate is 5℃ / min.

[0098] S3.2 Under a pressure of 10-15MPa, the holding time is 30-60 minutes, and hot pressing is performed to make the material and conductor tightly bonded together to form a composite motherboard blank.

[0099] S4, Post-processing

[0100] S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature.

[0101] S4.2. Grind and polish the surface of the cooled composite busbar to improve its surface quality.

[0102] S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

[0103] Example 1:

[0104] A high-strength fire-resistant composite busbar comprises the following components in parts by weight:

[0105] Copper conductor: 40 parts;

[0106] Ceramicized silicone rubber: 20 parts;

[0107] Nano-titanium dioxide modified epoxy resin: 10 parts;

[0108] Graphene-reinforced carbon fiber: 5 parts;

[0109] Fire retardant: 0.5 parts;

[0110] Antioxidant: 0.3 parts;

[0111] Coupling agent: 0.3 parts.

[0112] The antioxidant in this embodiment is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, and 2246, and phosphite antioxidants 168 and 618.

[0113] The coupling agent in this embodiment is either a silane coupling agent or a titanate coupling agent.

[0114] The preparation method of the nano-titanium dioxide modified epoxy resin in this embodiment is as follows:

[0115] S1. First, add 100 parts of epoxy resin to the reactor and stir evenly at a speed of 100 r / min under the condition of 80℃.

[0116] S2. Then, 5 parts of surface-treated nano-titanium dioxide powder are slowly added to the reaction vessel. After the addition is complete, the mixture is stirred at 100 r / min for 2 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin.

[0117] S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction at 120°C for 1 hour to obtain nano-titanium dioxide modified epoxy resin.

[0118] In S2 of this embodiment, the preparation steps of the surface-treated nano-titanium dioxide powder are as follows:

[0119] ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 2 hours at a temperature of 80℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface;

[0120] ② Silane coupling agent treatment: Prepare a 1% (w / w) silane coupling agent ethanol solution, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 4 with hydrochloric acid;

[0121] The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:10mL.

[0122] At a temperature of 40℃, the mixture was stirred at a speed of 200 r / min for 1 hour to ensure that the silane coupling agent was fully coated on the surface of the nano-titanium dioxide powder.

[0123] ③ Post-treatment: The treated nano-titanium dioxide powder was filtered using a Buchner funnel and washed twice with anhydrous ethanol, each time using 5 times the mass of the powder, to remove unreacted silane coupling agent.

[0124] It was then placed in a vacuum drying oven and dried for 3 hours at a temperature of 60℃ and a vacuum degree of -0.09MPa to obtain surface-treated nano-titanium dioxide powder.

[0125] The preparation method of graphene-reinforced carbon fiber in this embodiment is as follows:

[0126] S1. First, immerse the carbon fiber in a 5% nitric acid solution and ultrasonically treat it for 30 minutes at a temperature of 60°C to activate the carbon fiber surface.

[0127] S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 80°C.

[0128] S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 200 r / min for 3 hours at a temperature of 50℃ to make the graphene uniformly adhere to the surface of the carbon fiber.

[0129] S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

[0130] The preparation method of the fire retardant in this embodiment is as follows:

[0131] S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous.

[0132] S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants;

[0133] S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C.

[0134] S4. Grind the dried product into powder to obtain the fire retardant.

[0135] An integrated molding process for high-strength fire-resistant composite busbars includes the following steps:

[0136] S1. Raw material preparation

[0137] S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions.

[0138] S1.2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use.

[0139] S2, Mixing and stirring

[0140] S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer, and stir at 300 r / min for 30 minutes at a temperature of 50℃ to ensure that all components are fully mixed.

[0141] S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at 300 r / min for 15 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture.

[0142] S3, Molding Processing

[0143] S3.1. Place the mixed material and the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 120℃ and the heating rate is 5℃ / min.

[0144] S3.2 Under a pressure of 10MPa and a holding time of 30 minutes, hot pressing is performed to tightly bond the material with the conductor and form a composite motherboard blank.

[0145] S4, Post-processing

[0146] S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature.

[0147] S4.2. Grind and polish the surface of the cooled composite busbar to improve its surface quality.

[0148] S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

[0149] Example 2:

[0150] A high-strength fire-resistant composite busbar comprises the following components in parts by weight:

[0151] Copper conductor: 60 parts;

[0152] Ceramicized silicone rubber: 30 parts;

[0153] Nano-titanium dioxide modified epoxy resin: 20 parts;

[0154] Graphene-reinforced carbon fiber: 10 parts;

[0155] Fire retardant: 1.5 parts;

[0156] Antioxidant: 0.8 parts;

[0157] Coupling agent: 0.7 parts.

[0158] The antioxidant in this embodiment is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, and 2246, and phosphite antioxidants 168 and 618.

[0159] The coupling agent in this embodiment is either a silane coupling agent or a titanate coupling agent.

[0160] The preparation method of the nano-titanium dioxide modified epoxy resin in this embodiment is as follows:

[0161] S1. First, add 100 parts of epoxy resin to the reactor and stir it evenly at a speed of 150 r / min under the condition of 100℃.

[0162] S2. Then, slowly add 10 parts of surface-treated nano-titanium dioxide powder into the reactor. After the addition is complete, continue to stir at 150 r / min for 3 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin.

[0163] S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction at 150°C for 2 hours to obtain nano-titanium dioxide modified epoxy resin.

[0164] In S2 of this embodiment, the preparation steps of the surface-treated nano-titanium dioxide powder are as follows:

[0165] ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 3 hours at a temperature of 100℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface;

[0166] ② Silane coupling agent treatment: Prepare a 3% (w / w) silane coupling agent ethanol solution, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 5 with hydrochloric acid;

[0167] The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:15mL.

[0168] The reaction was carried out at 60℃ and stirred at 300r / min for 2 hours to ensure that the silane coupling agent was fully coated on the surface of the nano titanium dioxide powder.

[0169] ③ Post-treatment: The treated nano-titanium dioxide powder was filtered using a Buchner funnel and washed three times with anhydrous ethanol, each time using five times the mass of the powder, to remove unreacted silane coupling agent.

[0170] It was then placed in a vacuum drying oven and dried for 4 hours at a temperature of 80℃ and a vacuum degree of -0.09MPa to obtain surface-treated nano-titanium dioxide powder.

[0171] The preparation method of graphene-reinforced carbon fiber in this embodiment is as follows:

[0172] S1. First, immerse the carbon fiber in a 10% nitric acid solution and sonicate it at 80°C for 60 minutes to activate the carbon fiber surface.

[0173] S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 100°C.

[0174] S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 300 r / min for 5 hours at a temperature of 70℃ to make the graphene uniformly adhere to the surface of the carbon fiber.

[0175] S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

[0176] The preparation method of the fire retardant in this embodiment is as follows:

[0177] S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous.

[0178] S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants;

[0179] S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C.

[0180] S4. Grind the dried product into powder to obtain the fire retardant.

[0181] An integrated molding process for high-strength fire-resistant composite busbars includes the following steps:

[0182] S1. Raw material preparation

[0183] S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions.

[0184] S1.2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use.

[0185] S2, Mixing and stirring

[0186] S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer, and stir at 500 r / min for 60 minutes at a temperature of 70℃ to ensure that all components are fully mixed.

[0187] S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at 500 r / min for 30 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture.

[0188] S3, Molding Processing

[0189] S3.1. Place the mixed material together with the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 150℃ and the heating rate is 5℃ / min.

[0190] S3.2 Under a pressure of 15MPa and a holding time of 60 minutes, hot pressing is performed to tightly bond the material with the conductor and form a composite motherboard blank.

[0191] S4, Post-processing

[0192] S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature.

[0193] S4.2. Grind and polish the surface of the cooled composite busbar to improve its surface quality.

[0194] S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

[0195] Example 3:

[0196] A high-strength fire-resistant composite busbar comprises the following components in parts by weight:

[0197] Copper conductor: 50 parts;

[0198] Ceramicized silicone rubber: 25 parts;

[0199] Nano-titanium dioxide modified epoxy resin: 15 parts;

[0200] Graphene-reinforced carbon fiber: 7.5 parts;

[0201] Fire retardant: 1 part;

[0202] Antioxidant: 0.6 parts;

[0203] Coupling agent: 0.5 parts.

[0204] The antioxidant in this embodiment is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, and 2246, and phosphite antioxidants 168 and 618.

[0205] The coupling agent in this embodiment is either a silane coupling agent or a titanate coupling agent.

[0206] The preparation method of the nano-titanium dioxide modified epoxy resin in this embodiment is as follows:

[0207] S1. First, add 100 parts of epoxy resin to the reactor and stir evenly at a speed of 100-150 r / min under the condition of 80-100℃.

[0208] S2. Then, slowly add 5-10 parts of surface-treated nano-titanium dioxide powder into the reactor. After the addition is complete, continue stirring at 125 r / min for 2.5 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin.

[0209] S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction at a temperature of 135℃ for 1.5 hours to obtain nano-titanium dioxide modified epoxy resin.

[0210] In S2 of this embodiment, the preparation steps of the surface-treated nano-titanium dioxide powder are as follows:

[0211] ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 2.5 hours at a temperature of 90℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface;

[0212] ② Silane coupling agent treatment: Prepare a 2% (w / w) silane coupling agent ethanol solution, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 4.5 with hydrochloric acid;

[0213] The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:13mL.

[0214] The reaction was carried out at 50°C with stirring at 250 r / min for 1.5 hours to ensure that the silane coupling agent was fully coated on the surface of the nano-titanium dioxide powder.

[0215] ③ Post-treatment: The treated nano-titanium dioxide powder was filtered using a Buchner funnel and washed three times with anhydrous ethanol, each time using five times the mass of the powder, to remove unreacted silane coupling agent.

[0216] It was then placed in a vacuum drying oven and dried for 3.5 hours at a temperature of 70°C and a vacuum of -0.09 MPa to obtain surface-treated nano-titanium dioxide powder.

[0217] The preparation method of graphene-reinforced carbon fiber in this embodiment is as follows:

[0218] S1. First, immerse the carbon fiber in a 7.5% nitric acid solution and ultrasonically treat it for 45 minutes at a temperature of 70°C to activate the carbon fiber surface.

[0219] S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 90°C.

[0220] S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 250 r / min for 4 hours at a temperature of 60℃ to make the graphene uniformly adhere to the surface of the carbon fiber.

[0221] S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

[0222] The preparation method of the fire retardant in this embodiment is as follows:

[0223] S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous.

[0224] S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants;

[0225] S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C.

[0226] S4. Grind the dried product into powder to obtain the fire retardant.

[0227] An integrated molding process for high-strength fire-resistant composite busbars includes the following steps:

[0228] S1. Raw material preparation

[0229] S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions.

[0230] S1.2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use.

[0231] S2, Mixing and stirring

[0232] S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer, and stir at 400 r / min for 45 minutes at a temperature of 60℃ to ensure that all components are fully mixed.

[0233] S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at 400 r / min for 23 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture.

[0234] S3, Molding Processing

[0235] S3.1. Place the mixed material together with the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 135℃ and the heating rate is 5℃ / min.

[0236] S3.2 Under a pressure of 12.5 MPa and a holding time of 45 minutes, hot pressing is performed to tightly bond the material with the conductor and form a composite motherboard blank.

[0237] S4, Post-processing

[0238] S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature.

[0239] S4.2. Grind and polish the surface of the cooled composite busbar to improve its surface quality.

[0240] S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

[0241] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0242] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-strength fire-resistant composite busbar, characterized in that, The composition includes the following parts by weight: Copper conductor: 40-60 parts; Ceramicized silicone rubber: 20-30 parts; Nano-titanium dioxide modified epoxy resin: 10-20 parts; Graphene-reinforced carbon fiber: 5-10 parts; Fire retardant: 0.5-1.5 parts; Antioxidant: 0.3-0.8 parts; Coupling agent: 0.3-0.7 parts.

2. The high-strength fireproof composite busbar according to claim 1, characterized in that, The antioxidant is one or a mixture of several of the hindered phenolic antioxidants 1010, 1076, and 2246, and phosphite antioxidants 168 and 618.

3. The high-strength fireproof composite busbar according to claim 1, characterized in that, The coupling agent is either a silane coupling agent or a titanate coupling agent.

4. The high-strength fireproof composite busbar according to claim 1, characterized in that, The preparation method of the nano-titanium dioxide modified epoxy resin is as follows: S1. First, add 100 parts of epoxy resin to the reactor and stir evenly at a speed of 100-150 r / min under the condition of 80-100℃. S2. Then, slowly add 5-10 parts of surface-treated nano-titanium dioxide powder into the reactor. After the addition is complete, continue to stir the reaction at a speed of 100-150 r / min for 2-3 hours to make the nano-titanium dioxide uniformly dispersed in the epoxy resin. S3. Finally, add a curing agent with a mass ratio of 1:10 to the epoxy resin, and cure the reaction for 1-2 hours at a temperature of 120-150℃ to obtain nano-titanium dioxide modified epoxy resin.

5. A high-strength fireproof composite busbar according to claim 4, characterized in that, In step S2, the preparation steps of the surface-treated nano-titanium dioxide powder are as follows: ① Pretreatment: Place the nano titanium dioxide powder in a vacuum drying oven and dry it for 2-3 hours at a temperature of 80-100℃ and a vacuum degree of -0.09MPa to remove the moisture adsorbed on the powder surface; ② Silane coupling agent treatment: Prepare a silane coupling agent ethanol solution with a mass fraction of 1%-3%, wherein the volume ratio of ethanol to water is 9:1, and adjust the pH of the solution to 4-5 with hydrochloric acid; The dried nano-titanium dioxide powder was added to the above solution, and the mass-volume ratio of nano-titanium dioxide powder to solution was 1g:10-15mL. Under conditions of 40-60℃, stir the reaction at a speed of 200-300r / min for 1-2 hours to fully coat the surface of the nano titanium dioxide powder with the silane coupling agent. ③ Post-treatment: The treated nano-titanium dioxide powder is filtered using a Buchner funnel and washed 2-3 times with anhydrous ethanol, each time using 5 times the mass of the powder, to remove unreacted silane coupling agent. It was then placed in a vacuum drying oven and dried for 3-4 hours at a temperature of 60-80℃ and a vacuum of -0.09MPa to obtain surface-treated nano-titanium dioxide powder.

6. A high-strength fireproof composite busbar according to claim 1, characterized in that, The preparation method of the graphene-reinforced carbon fiber is as follows: S1. First, immerse the carbon fiber in a nitric acid solution with a mass fraction of 5%-10% and ultrasonically treat it for 30-60 minutes at a temperature of 60-80℃ to activate the surface of the carbon fiber. S2. Take out the activated carbon fiber, rinse it with deionized water until neutral, and then dry it in an oven at 80-100℃. S3. Add the dried carbon fiber to an organic solvent containing graphene, and stir at 200-300 r / min for 3-5 hours at a temperature of 50-70℃ to make the graphene uniformly adhere to the surface of the carbon fiber. S4. Finally, graphene-reinforced carbon fibers are obtained through filtration, washing, and drying processes.

7. The high-strength fireproof composite busbar according to claim 1, characterized in that, The preparation method of the fire retardant is as follows: S1. Mix ammonium dihydrogen phosphate and boric acid at a mass ratio of 2:1, add an appropriate amount of deionized water and stir until homogeneous. S2. Heat and stir at 80°C for 2 hours to fully dissolve the reactants; S3. After cooling the solution to room temperature, add a 10% polyvinyl alcohol solution, stir well, and then dry at 60°C. S4. Grind the dried product into powder to obtain the fire retardant.

8. An integrated molding process for a high-strength fire-resistant composite busbar, characterized in that, Includes the following steps: S1. Raw material preparation S1.1 Weigh out the copper conductor, ceramicized silicone rubber, nano-titanium dioxide modified epoxy resin, graphene-reinforced carbon fiber, fire retardant, antioxidant and coupling agent according to the above mass proportions. S1.

2. Use sandpaper to polish the copper conductor to remove the surface oxide layer, then wipe the surface with anhydrous ethanol to remove impurities and oxides, and let it air dry for later use. S2, Mixing and stirring S2.1 Add the weighed ceramicized silicone rubber, nano titanium dioxide modified epoxy resin and other additives to a high-speed mixer. Stir at 300-500 r / min for 30-60 minutes at a temperature of 50-70℃ to ensure that all components are fully mixed. S2.2 Next, add graphene-reinforced carbon fibers to the above mixture and continue stirring at a speed of 300-500 r / min for 15-30 minutes to ensure that the graphene-reinforced carbon fibers are evenly dispersed in the mixture. S3, Molding Processing S3.

1. Place the mixed material together with the pretreated copper or aluminum conductor into a special mold. The mold temperature is controlled at 120-150℃, and the heating rate is 5℃ / min. S3.2 Under a pressure of 10-15MPa, the holding time is 30-60 minutes, and hot pressing is performed to make the material and conductor tightly bonded together to form a composite motherboard blank. S4, Post-processing S4.1 Remove the formed composite motherboard blank from the mold and allow it to cool naturally to room temperature. S4.

2. Grind and polish the surface of the cooled composite busbar to improve its surface quality. S4.3 Finally, the composite busbar is subjected to performance testing, including but not limited to fire resistance and strength, to ensure that the product quality meets the requirements.

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