Aramid fiber material insulating rod for high-voltage drawout lever and preparation method thereof

Abstract

The application relates to the technical field of power equipment, in particular to a high-voltage pull-out lever aramid fiber material insulating rod and a preparation method thereof. The preparation method is as follows: after aramid fiber bundles are treated by plasma, the aramid fiber bundles are soaked in a silane coupling agent solution, and then are dried to obtain pretreated aramid fiber bundles; after epoxy resin, nano-silicon dioxide particles and an anti-aging agent are uniformly mixed, a resin matrix is obtained; after the pretreated aramid fiber bundles are impregnated in the resin matrix, the aramid fiber bundles are wound on a conical core mold; the core mold after the aramid fiber bundles are wound is subjected to temperature curing, and after the curing is completed, the core mold is demolded to obtain a hollow circular truncated cone pipe material; the pipe material is subjected to surface treatment, and according to the length requirement, a plurality of pipe materials are assembled to obtain the high-voltage pull-out lever aramid fiber material insulating rod. The insulating rod is more lightweight, has better dynamic stiffness, can inhibit operation flutter, has better weather resistance and durability, and thus the operation safety and precision are improved.

Description

TECHNICAL FIELD

[0001] The application relates to an aramid fiber material insulating rod for a high-voltage pull-out rod and a preparation method, and belongs to the technical field of power equipment. BACKGROUND

[0002] In the process of power system operation and maintenance, the high-voltage pull-out rod is a key insulating tool for operating high-voltage disconnectors, drop-out fuses and other equipment. At present, the high-voltage pull-out rods on the market are mostly made of glass fiber reinforced plastic (epoxy resin and glass fiber composite). For example, the patent application with the publication number CN104953510A discloses an insulating operating rod capable of measuring distance and height, and the insulating operating rod body is made of epoxy resin material and is integrally surrounded by alkali-free glass fiber material under pressure. The patent application with the publication number CN107838882A discloses a multi-section insulating rod, and the insulating rod is a glass fiber pipe. The pull-out rod with the traditional material has many obvious defects and needs to be improved.

[0003] From the perspective of mechanical performance, the density of glass fiber is relatively high, reaching 2.4-2.7 g / cm 3 , so that the overall weight of the pull-out rod is too large. Taking a conventional 10kV level 5-meter-long glass fiber reinforced plastic pull-out rod as an example, its weight can reach 4-7 kg. In actual power operation, the operator is prone to fatigue after a long time of holding operation, which not only reduces the work efficiency, but also threatens the operation safety, and there is a risk of operation failure due to physical exhaustion. In addition, the glass fiber material itself has insufficient dynamic stiffness, and the pull-out rod is prone to fluttering phenomenon during force operation, especially during fine operations such as aligning high-voltage contacts. The fluttering will seriously affect the operation accuracy and greatly increase the possibility of misoperation, which may further cause power safety accidents.

[0004] In terms of electrical performance and durability, the glass fiber reinforced plastic material has poor weather resistance. When exposed to outdoor complex environment for a long time, its insulation performance and mechanical strength will gradually decrease with time, and it cannot stably meet the safety requirements of power operation. For example, under harsh conditions such as high humidity and high salt fog, the insulation resistance of the glass fiber reinforced plastic pull-out rod decreases obviously, and the mechanical structure may also have strength reduction due to corrosion and other reasons.

[0005] From the perspective of manufacturing process, the production process of the traditional glass fiber reinforced plastic pull-out rod is complex, involving multiple processes such as glass fiber pretreatment, resin impregnation and curing forming. Not only the processing cycle is long, but also the production cost is high, which is not conducive to large-scale popularization and application.

[0006] In summary, the existing glass fiber reinforced plastic high-voltage pull-out pole has the problems of excessive self-weight, easy vibration during operation, poor weather resistance and high production cost, and it is difficult to meet the higher requirements of light weight, stability, durability and economy of high-voltage pull-out pole in the process of intelligent and efficient development of power system. Therefore, it is urgent to develop a new type of pull-out pole with new structure and material to solve the above technical problems. SUMMARY

[0007] The present application provides a kind of aramid fiber material insulating pole for high-voltage pull-out pole and preparation method, which solves the defects of excessive self-weight and easy vibration during operation of existing glass fiber reinforced plastic pull-out pole, the self-weight of the aramid fiber material high-voltage pull-out pole is low, the dynamic stiffness of the pole body is high, the operation safety and precision are improved, and the service life of the pull-out pole is also prolonged.

[0008] The technical scheme for solving the above technical problems is as follows: a preparation method of an aramid fiber material insulating pole for high-voltage pull-out pole, the preparation method is:

[0009] S1, fiber pretreatment and resin matrix preparation:

[0010] After the aramid fiber bundle is treated by plasma, it is soaked in a silane coupling agent solution, dried, and a pretreated aramid fiber bundle is obtained;

[0011] The epoxy resin, nano-silicon dioxide particles and anti-aging agent are mixed uniformly to obtain a resin matrix;

[0012] S2, winding forming:

[0013] After the pretreated aramid fiber bundle is immersed in the resin matrix, it is wound on a conical core mold;

[0014] S3, curing and demolding:

[0015] The core mold after winding the aramid fiber bundle is heated and cured, and after curing, the hollow circular cone pipe material is demolded; the pipe material is surface treated, and according to the length requirement, the pipe material is assembled to obtain an aramid fiber material insulating pole for high-voltage pull-out pole.

[0016] Further, the mass percentage of each material in the preparation of the insulating pole is 65%-70% aramid fiber, 24%-30% epoxy resin, 2%-5% silane coupling agent, 2%-4% nano-silicon dioxide and 1%-2% anti-aging agent, according to weight percentage.

[0017] Further, the plasma treatment conditions are as follows: under argon atmosphere, 4-6kV voltage, 30-50kHz frequency, 2-4min.

[0018] Further, in the step S2, the aramid fiber bundle after impregnated with the resin matrix is wound on the conical frustum mold according to a spiral angle of 25-35°.

[0019] Further, in the step S2, the winding tension is 10-20N.

[0020] Further, the specific process of preparing the resin matrix is as follows: the epoxy resin, nano-silicon dioxide particles and anti-aging agent are added into a reaction kettle according to a proportion, stirred at 60-80°C and a speed of 150-250r / min for 1-2h, and uniformly mixed to obtain the resin matrix.

[0021] Further, in the step S3, the temperature is raised to 120-150°C at a rate of 1-2°C / min, and the curing is carried out for 2-3h; after the curing is completed, the temperature is lowered to room temperature at a rate of 1-2°C / min, and the hollow conical frustum pipe is demolded.

[0022] Further, the thickness of the hollow conical frustum pipe is 2-3mm, the upper end face diameter is 25-30mm, the lower end face diameter is 35-40mm, the height is 1.2-1.4m, and the inclination angle of the hollow conical frustum pipe is 87-89°.

[0023] Further, the aramid fiber is aramid 1414 fiber, the density is 1.40-1.45g / cm3, the tensile strength is 3200-3600MPa, and the modulus is 120-140GPa; and the anti-aging agent is a hindered amine anti-aging agent.

[0024] The application further discloses an aramid fiber material insulating rod for a high-voltage pole.

[0025] The application has the following beneficial effects:

[0026] The insulating rod of the pole uses light-weight and high-strength aramid fiber reinforced composite material, effectively reduces the self weight of the pole, combines the conical frustum pipe structure design, improves the dynamic stiffness of the insulating rod, and suppresses the operation flutter; moreover, the insulating rod has good weather resistance and durability, thereby improving the operation safety and precision, reducing the production cost, prolonging the service life of the pole, and meeting the needs of the continuous development of the power industry.

[0027] Specifically, the insulating rod of this invention uses low-density aramid fiber and features a hollow frustum structure design. High-voltage switching rods made using this insulating rod are 50%-60% lighter than fiberglass switching rods of the same specifications. For example, a 5-meter-long 10kV switching rod can weigh only 2-3 kg, significantly reducing the labor intensity of operators and improving work efficiency. Furthermore, the hollow frustum tubular structure effectively enhances the dynamic stiffness of the insulating rod. Actual testing has verified that its anti-flutter capability is improved compared to traditional cylindrical rods. During operation, the vibration amplitude of the insulating rod is reduced, enabling more precise operation, reducing the risk of misoperation, and providing superior operational stability, thus ensuring the safety of power operations. The aramid fiber reinforced composite material gives the switching rod extremely high mechanical strength and good weather resistance. Both tensile and flexural strength are improved compared to fiberglass. Simultaneously, the addition of nanoparticles and anti-aging agents extends its service life under harsh environments such as ultraviolet radiation and acid rain, reducing equipment replacement frequency and maintenance costs.

[0028] In addition, the method for preparing the insulating rod described in this invention uses a fiber winding process, which is suitable for manufacturing frustum-shaped structures and can achieve automated production. Compared with the complex molding process of traditional fiberglass gate rods, the production efficiency is increased by about 30%, and the product quality stability is better. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the hollow frustum tube described in this invention;

[0030] Figure 2 This is a schematic diagram of the structure of the insulating rod described in this invention. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below. The present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the invention.

[0033] A method for preparing an aramid fiber insulating rod for high-voltage switch rods, wherein the preparation method comprises:

[0034] S1. Fiber pretreatment and resin matrix preparation:

[0035] Aramid fiber bundles are pretreated by plasma treatment, then immersed in a silane coupling agent solution and dried to obtain pretreated aramid fiber bundles.

[0036] The resin matrix is ​​obtained by uniformly mixing epoxy resin, nano silica particles and anti-aging agent.

[0037] S2, Filament winding:

[0038] After the pretreated aramid fiber bundles are impregnated with the resin matrix, they are wound onto the conical mandrel.

[0039] S3, Curing and Demolding:

[0040] The mandrel after the aramid fiber bundle is wound is heated and cured. After curing, the hollow frustum tube is demolded. The tube is then surface-treated, and multiple sections of the tube are assembled according to the required length to obtain an aramid fiber insulating rod for high-voltage switch rods.

[0041] The structure of the hollow frustum tube is as follows: Figure 1 As shown, the insulating rod structure for high-voltage switch rods is obtained by assembling multiple sections of tubing according to the required length. Figure 2 As shown, the insulating rod adopts a segmented design, with each segment connected by connectors (for example, carbon fiber connectors are used in this embodiment). The form of the connectors is not strictly limited, as long as a firm connection between the segments can be achieved (connectors commonly used in high-voltage switch rods can be used directly). Sealing rubber rings can be installed between each segment of the tube and the connectors to ensure a tight connection and waterproof and dustproof performance. The operating end of the insulating rod is equipped with a non-slip grip with a non-slip textured surface and an embedded shock-absorbing rubber layer; the working end can be detachably installed with different types of operating heads (such as hook-shaped or fork-shaped) according to usage requirements.

[0042] Specifically, by weight percentage, the materials used in the preparation of the insulating rod are as follows: aramid fiber 65%-70%, epoxy resin 24%-30%, silane coupling agent 2%-5%, nano-silica 2%-4%, and anti-aging agent 1%-2%. The addition of the silane coupling agent enhances the compatibility between the fiber and the resin, the nano-silica particles improve the product's wear resistance and hardness, and the anti-aging agent enhances the material's weather resistance. High-temperature resistant and high-toughness epoxy resin is used as the matrix; this resin has good flowability and wettability, and can form a high-strength interfacial bond with the aramid fiber.

[0043] Specifically, the plasma treatment conditions are as follows: under an argon atmosphere, the fiber is treated with a voltage of 4-6kV and a frequency of 30-50kHz for 2-4 minutes to improve the surface activity of the fiber.

[0044] More specifically, the silane coupling agent solution is formed by dissolving the silane coupling agent in ethanol to form a homogeneous solution, wherein the mass concentration of the silane coupling agent in the silane coupling agent solution is 3%-5%.

[0045] More specifically, after plasma treatment, the aramid fiber bundles are soaked in a silane coupling agent solution for 3-5 hours, then dried at 80-100℃ for 2-3 hours to obtain pretreated aramid fiber bundles.

[0046] The specific process for preparing the resin matrix is ​​as follows: epoxy resin, nano silica particles, and anti-aging agent are added to the reaction vessel in proportion, and stirred at 150-250 r / min for 1-2 hours at 60-80℃ until they are mixed evenly.

[0047] Specifically, in step S2, during the winding process, the aramid fiber bundles impregnated with the resin matrix are wound onto the conical mandrel at a spiral angle of 25°-35°.

[0048] Specifically, during step S2 winding, the winding tension is 10-20N to ensure that the fibers are tightly arranged and without wrinkles.

[0049] Specifically, in step S3, during the curing process, the temperature is increased to 120-150℃ at a rate of 1-2℃ / min, and the temperature is maintained for curing for 2-3 hours. After curing, the temperature is reduced to room temperature at a rate of 1-2℃ / min, and the hollow frustum tube is demolded.

[0050] More specifically, in step S3, the hollow frustum tube obtained by demolding is subjected to surface grinding and polishing to remove burrs; the various sections of the tube are assembled into a complete insulating rod through high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0051] Specifically, the hollow frustum tube has a thickness of 2-3mm, an upper diameter of 25-30mm, a lower diameter of 35-40mm, and a height of 1.2-1.4m. The inclination angle (the angle between the side generatrix and the bottom surface) of the hollow frustum tube is 87°-89°. This hollow frustum tube structure optimizes the stress distribution of the rod under load. Compared to traditional cylindrical rods, its moment of inertia increases by 20%-30%, significantly improving its resistance to bending and flutter. Simultaneously, the hollow design further reduces weight, resulting in even greater weight reduction compared to solid structures.

[0052] Specifically, the aramid fiber is aramid 1414 fiber with a density of 1.40-1.45 g / cm³. 3 The tensile strength is 3200-3600 MPa, and the modulus is 120-140 GPa, significantly reducing the weight of the rod while ensuring high strength. The anti-aging agent is a hindered amine anti-aging agent.

[0053] More specifically, the aramid 1414 fiber used in this embodiment of the invention has a density of 1.44 g / cm³. 3 It has a tensile strength of 3500MPa and a modulus of 130GPa.

[0054] More specifically, the epoxy resin used in the embodiments of the present invention is model 315K, purchased from Weihai Guangxuan New Materials Co., Ltd.; the silane coupling agent used in the embodiments of the present invention is KH-602, purchased from Anhui Sibao; and the hindered amine anti-aging agent used in the embodiments of the present invention is N-ethylethylenediamine, purchased from Maclean.

[0055] The present invention also discloses an aramid fiber insulating rod for high-voltage switch rods, wherein the insulating rod is prepared according to the preparation method described in the present invention.

[0056] Example 1

[0057] Preparation of an aramid fiber insulating rod for high-voltage switch rods:

[0058] Materials required: 7 kg of aramid 1414 fiber bundles, 2.5 kg of epoxy resin, 0.35 kg of silane coupling agent, 0.25 kg of nano-silica particles, and 0.15 kg of hindered amine anti-aging agent.

[0059] S1. Fiber pretreatment and resin matrix preparation:

[0060] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 3 minutes at a voltage of 5kV, a frequency of 40kHz, and an argon atmosphere; then immersed in a 4% silane coupling agent solution for 4 hours and dried at 80℃ for 2.5 hours.

[0061] Resin matrix preparation: Epoxy resin, nano silica particles and anti-aging agent are added to the reactor and stirred for 1.5 h at 70℃ and a stirring speed of 200 r / min to obtain the resin matrix.

[0062] S2, Filament winding:

[0063] After impregnating the pretreated fiber bundles with resin, they are wound around a conical mandrel at a 30° helix angle (after winding, the outer diameter of the operating end is 38 mm, the outer diameter of the working end is 28 mm, and the height is 1.3 m), with the winding tension controlled at 15 N.

[0064] S3, Curing and Demolding:

[0065] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 150°C at a rate of 1.5°C / min, and cured for 2 hours. After curing, it is cooled to room temperature at a rate of 2°C / min and then demolded.

[0066] The hollow frustum tubes obtained after demolding are ground and polished to remove burrs; the four sections of hollow frustum tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0067] Example 2

[0068] Preparation of an aramid fiber insulating rod for high-voltage switch rods:

[0069] Materials required: 6.5 kg of aramid 1414 fiber bundles, 3.0 kg of epoxy resin, 0.2 kg of silane coupling agent, 0.2 kg of nano-silica particles, and 0.1 kg of hindered amine anti-aging agent.

[0070] S1. Fiber pretreatment and resin matrix preparation:

[0071] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 4 min under a 4 kV voltage, 30 kHz frequency and argon atmosphere; then immersed in a 5% silane coupling agent solution for 3 h and dried at 100℃ for 2 h.

[0072] Resin matrix preparation: Epoxy resin, nano silica particles, and anti-aging agent are added to a reaction vessel and stirred for 2 hours at 60°C and a stirring speed of 250 r / min to obtain the resin matrix.

[0073] S2, Filament winding:

[0074] After impregnating the pretreated fiber bundles with resin, they are wound around a conical mandrel at a 25° helix angle (after winding, the outer diameter of the operating end is 35mm, the outer diameter of the working end is 25mm, and the height is 1.2m), with the winding tension controlled at 10N.

[0075] S3, Curing and Demolding:

[0076] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 120°C at a rate of 1°C / min, and cured for 3 hours. After curing, it is cooled to room temperature at a rate of 1°C / min and then demolded.

[0077] The hollow frustum tubes obtained after demolding are ground and polished to remove burrs; the four sections of hollow frustum tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0078] Example 3

[0079] Preparation of an aramid fiber insulating rod for high-voltage switch rods:

[0080] Materials required: 7.0 kg aramid 1414 fiber bundle, 2.4 kg epoxy resin, 0.2 kg silane coupling agent, 0.2 kg nano silica particles, and 0.2 kg hindered amine anti-aging agent.

[0081] S1. Fiber pretreatment and resin matrix preparation:

[0082] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 2 minutes at a voltage of 6kV, a frequency of 50kHz, and an argon atmosphere; then immersed in a 3% silane coupling agent solution for 5 hours and dried at 80℃ for 3 hours.

[0083] Resin matrix preparation: Epoxy resin, nano silica particles, and anti-aging agent are added to a reaction vessel and stirred for 1 hour at 80°C and a stirring speed of 150 r / min to obtain the resin matrix.

[0084] S2, Filament winding:

[0085] After impregnating the pretreated fiber bundles with resin, they are wound around a conical mandrel at a 35° helix angle (after winding, the outer diameter of the operating end is 40 mm, the outer diameter of the working end is 30 mm, and the height is 1.4 m), with the winding tension controlled at 20 N.

[0086] S3, Curing and Demolding:

[0087] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 150°C at a rate of 2°C / min, and cured for 2 hours. After curing, it is cooled to room temperature at a rate of 2°C / min and then demolded.

[0088] The hollow frustum tubes obtained after demolding are ground and polished to remove burrs; the four sections of hollow frustum tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0089] Example 4

[0090] Preparation of an aramid fiber insulating rod for high-voltage switch rods:

[0091] Materials required: 6.5 kg of aramid 1414 fiber bundles, 2.5 kg of epoxy resin, 0.5 kg of silane coupling agent, 0.4 kg of nano-silica particles, and 0.1 kg of hindered amine anti-aging agent.

[0092] S1. Fiber pretreatment and resin matrix preparation:

[0093] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 3 minutes at a voltage of 5kV, a frequency of 40kHz, and an argon atmosphere; then immersed in a 4% silane coupling agent solution for 4 hours and dried at 80℃ for 2.5 hours.

[0094] Resin matrix preparation: Epoxy resin, nano silica particles and anti-aging agent are added to the reactor and stirred for 1.5 h at 70℃ and a stirring speed of 200 r / min to obtain the resin matrix.

[0095] S2, Filament winding:

[0096] After impregnating the pretreated fiber bundles with resin, they are wound around a conical mandrel at a 30° helix angle (after winding, the outer diameter of the operating end is 40 mm, the outer diameter of the working end is 25 mm, and the height is 1.3 m), with the winding tension controlled at 12 N.

[0097] S3, Curing and Demolding:

[0098] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 140°C at a rate of 1.5°C / min, and cured for 2 hours. After curing, it is cooled to room temperature at a rate of 2°C / min and then demolded.

[0099] The hollow frustum tubes obtained after demolding are ground and polished to remove burrs; the four sections of hollow frustum tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0100] Comparative Example 1

[0101] Hollow frustum tubes and insulating rods were prepared using the same method as in Example 1, except that the amount of epoxy resin was increased in Comparative Example 1. The mass percentage of epoxy resin in the raw materials in Comparative Example 1 was 34%, as detailed below:

[0102] Materials required: 7.0 kg aramid 1414 fiber bundle, 4.0 kg epoxy resin, 0.35 kg silane coupling agent, 0.25 kg nano silica particles, and 0.15 kg hindered amine anti-aging agent.

[0103] The other preparation process is exactly the same as in Example 1.

[0104] Comparative Example 2

[0105] Hollow frustum tubes and insulating rods were prepared using the same method as in Example 1, except that the insulating rod prepared in Comparative Example 2 was cylindrical. The specific preparation process is as follows:

[0106] Materials required: 7.0 kg aramid 1414 fiber bundle, 2.5 kg epoxy resin, 0.35 kg silane coupling agent, 0.25 kg nano silica particles, and 0.15 kg hindered amine anti-aging agent.

[0107] S1. Fiber pretreatment and resin matrix preparation:

[0108] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 3 minutes at a voltage of 5kV, a frequency of 40kHz, and an argon atmosphere; then immersed in a 4% silane coupling agent solution for 4 hours and dried at 80℃ for 2.5 hours.

[0109] Resin matrix preparation: Epoxy resin, nano silica particles and anti-aging agent are added to the reactor and stirred for 1.5 h at 70℃ and a stirring speed of 200 r / min to obtain the resin matrix.

[0110] S2, Filament winding:

[0111] After impregnating the pretreated fiber bundles with resin, they are wound around a cylindrical mandrel (after winding, the outer diameter is 33mm and the height is 1.3m) at a 30° helix angle, with the winding tension controlled at 15N.

[0112] S3, Curing and Demolding:

[0113] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 150°C at a rate of 1.5°C / min, and cured for 2 hours. After curing, it is cooled to room temperature at a rate of 2°C / min and then demolded.

[0114] The hollow cylindrical tubes obtained after demolding are ground and polished to remove burrs; the four hollow cylindrical tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0115] Comparative Example 3

[0116] The hollow frustum tube and insulating rod were prepared using the same method as in Example 1, except that the outer diameter of the working end was reduced in Comparative Example 3, resulting in an inclination angle (the angle between the side generatrix and the bottom surface) of 85° for the hollow frustum tube. The specific preparation process is as follows:

[0117] Materials required: 70kg aramid 1414 fiber bundles, 25kg epoxy resin, 3.5kg silane coupling agent, 2.5kg nano silica particles, and 1.5kg hindered amine anti-aging agent.

[0118] S1. Fiber pretreatment and resin matrix preparation:

[0119] Fiber pretreatment: The aramid fiber bundles were placed in a plasma treatment device and treated for 3 minutes at a voltage of 5kV, a frequency of 40kHz, and an argon atmosphere; then immersed in a 4% silane coupling agent solution for 4 hours and dried at 80℃ for 2.5 hours.

[0120] Resin matrix preparation: Epoxy resin, nano silica particles and anti-aging agent are added to the reactor and stirred for 1.5 h at 70℃ and a stirring speed of 200 r / min to obtain the resin matrix.

[0121] S2, Filament winding:

[0122] After impregnating the pretreated fiber bundles with resin, they are wound around a conical mandrel at a 30° helix angle (after winding, the outer diameter of the operating end is 38 mm, the outer diameter of the working end is 16 mm, and the height is 1.3 m), with the winding tension controlled at 15 N.

[0123] S3, Curing and Demolding:

[0124] The mandrel after the aramid fiber bundles are wound is placed in a curing oven, heated to 150°C at a rate of 1.5°C / min, and cured for 2 hours. After curing, it is cooled to room temperature at a rate of 2°C / min and then demolded.

[0125] The hollow frustum tubes obtained after demolding are ground and polished to remove burrs; the four sections of hollow frustum tubes are assembled into a complete insulating rod using high-strength connectors, and the operating end handle and working end operating head are installed to obtain the high-voltage switch rod.

[0126] Comparative Example 4

[0127] Hollow frustum tubes and insulating rods were prepared using the same method as in Example 1, except that the winding tension was controlled at 5N during the winding process of Comparative Example 4, which is lower than the winding tension specified in this invention. Other preparation methods were the same as in Example 1.

[0128] Comparative Example 5

[0129] Hollow frustum tubes and insulating rods were prepared using the same method as in Example 1, with the difference that in Comparative Example 5, aramid 1414 fiber bundles were replaced with glass fiber bundles (Chongqing International Composite Materials Co., Ltd., grade 468A), as detailed below:

[0130] Materials required: 7.0 kg glass fiber bundle, 2.5 kg epoxy resin, 0.35 kg silane coupling agent, 0.25 kg nano silica particles, and 0.15 kg hindered amine anti-aging agent.

[0131] The other preparation process is exactly the same as in Example 1.

[0132] The hollow frustum tubes and insulating rods prepared in the above embodiments and comparative examples were subjected to performance tests. The specific test results are shown in Table 1 below. The testing methods involved are as follows:

[0133] Mechanical performance testing methods: Bending tests are conducted using a universal testing machine; the operating conditions are simulated using a vibration testing bench to test the natural frequency of the hollow frustum tube, ensuring that it avoids the excitation frequency during operation and reducing flutter.

[0134] Electrical performance test: The hollow frustum tube was subjected to a power frequency withstand voltage test, and the leakage current was recorded at 100kV for 1 minute.

[0135] Flutter performance test: One end of the high-voltage switch rod was fixed using a vibration test bench, and the vibration was tested at 10 times / second with an acceleration of 10 m / s². 2 Test the conditions and record the swing amplitude of the other end of the lever.

[0136] Appearance quality inspection: Visually inspect the surface of the insulating rod; it should be smooth, flat, free of bubbles and cracks; measure the dimensions of each part to ensure they meet the design requirements.

[0137] Table 1 Performance Test Data

[0138]

[0139] As can be seen from the data in the table above, the insulating rods prepared by the method described in this invention in Examples 1-4 are lighter, effectively reducing the weight of the switch rod. At the same time, the insulating rods have better dynamic stiffness, suppressing operational chatter. Moreover, the insulating rods have better weather resistance and durability, thereby improving operational safety and accuracy, reducing production costs, extending the service life of the switch rods, and better adapting to the ever-evolving needs of the power industry.

[0140] A comparison of the experimental results of Comparative Example 1 and Example 1 shows that if the mass ratio of epoxy resin in the raw materials is increased during the preparation process, the weight of the pipe itself will increase. Furthermore, the increased resin content leads to a decrease in interlayer bonding performance, resulting in a reduction in bending load. In addition, the increase in epoxy resin causes resin lumps on the pipe surface, affecting the appearance of the pipe.

[0141] A comparison of the experimental results of Comparative Example 2 and Example 1 shows that if the insulating rod is cylindrical, the pipe will be more prone to flutter, affecting daily use.

[0142] A comparison of the experimental results of Comparative Example 3 and Example 1 shows that if the tilt angle of the hollow frustum tube is reduced (i.e., the taper is increased), the bending load of the tube is reduced, and the working pressure resistance of the tube is reduced.

[0143] A comparison of the experimental results of Comparative Example 4 and Example 1 shows that if the winding tension is reduced, the mechanical properties of the pipe will be reduced, resulting in a decrease in the bending load of the pipe.

[0144] The comparison of the experimental results of Comparative Example 5 and Examples 1-5 shows that the aramid fiber composite material used in this invention can significantly reduce the weight of the switch rod compared with conventional glass fiber material. Furthermore, due to the reduced weight of the aramid switch rod, its anti-flutter performance is superior to that of the glass fiber switch rod.

[0145] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0146] For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A method for preparing an aramid fiber insulating rod for high-voltage switch rods, characterized in that, The preparation method is as follows: S1. Fiber pretreatment and resin matrix preparation: Aramid fiber bundles are pretreated by plasma treatment, then immersed in a silane coupling agent solution and dried to obtain pretreated aramid fiber bundles. The resin matrix is ​​obtained by uniformly mixing epoxy resin, nano silica particles and anti-aging agent. S2, Filament winding: After the pretreated aramid fiber bundles are impregnated with the resin matrix, they are wound onto the conical mandrel. S3, Curing and Demolding: The mandrel after the aramid fiber bundle is wound is heated and cured. After curing, it is demolded to obtain a hollow frustum tube. The tube is then surface-treated, and multiple sections of the tube are assembled according to the required length to obtain an aramid fiber insulating rod for high-voltage switch rods. The thickness of the hollow frustum tube is 2-3mm. The mass percentages of each material used in the preparation of the insulating rod are as follows, based on weight percentage: aramid fiber 65%-70%, epoxy resin 24%-30%, silane coupling agent 2%-5%, nano silica 2%-4%, and anti-aging agent 1%-2%. During step S2 winding, the winding tension is 10-20N; After winding in step S2, the outer diameter of the operating end is 38mm, the outer diameter of the working end is 28mm, and the height is 1.3m; or the outer diameter of the operating end is 35mm, the outer diameter of the working end is 25mm, and the height is 1.2m; or the outer diameter of the operating end is 40mm, the outer diameter of the working end is 30mm, and the height is 1.4m; or the outer diameter of the operating end is 40mm, the outer diameter of the working end is 25mm, and the height is 1.3m.

2. The method for preparing an aramid fiber insulating rod for high-voltage switching rods according to claim 1, characterized in that, The plasma treatment conditions were as follows: under an argon atmosphere, the plasma was treated for 2-4 minutes at a voltage of 4-6 kV and a frequency of 30-50 kHz.

3. The method for preparing an aramid fiber insulating rod for high-voltage switch rods according to claim 1, characterized in that, The specific process for preparing the resin matrix is ​​as follows: epoxy resin, nano silica particles, and anti-aging agent are added to the reactor in proportion, and stirred at 150-250 r / min for 1-2 hours at 60-80℃ until the resin matrix is ​​obtained.

4. The method for preparing an aramid fiber insulating rod for high-voltage switch rods according to claim 1, characterized in that, In step S2, during the winding process, the aramid fiber bundles impregnated with the resin matrix are wound onto the conical mandrel at a spiral angle of 25°-35°.

5. The method for preparing an aramid fiber insulating rod for high-voltage switching rods according to claim 1, characterized in that, In step S3, during the curing process, the temperature is increased to 120-150℃ at a rate of 1-2℃ / min, and the temperature is maintained for curing for 2-3 hours. After curing, the temperature is reduced to room temperature at a rate of 1-2℃ / min, and the hollow frustum tube is demolded.

6. The method for preparing an aramid fiber insulating rod for high-voltage switching rods according to claim 1, characterized in that, The aramid fiber is aramid 1414 fiber with a density of 1.40-1.45 g / cm³, a tensile strength of 3200-3600 MPa, and a modulus of 120-140 GPa; the anti-aging agent is a hindered amine anti-aging agent.

7. An aramid fiber insulating rod for use as a high-voltage switching rod, characterized in that, The insulating rod is prepared according to the preparation method described in any one of claims 1-6.

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