A kind of aging-resistant lightweight insulating rod and preparation method thereof

Abstract

The invention discloses an aging-resistant lightweight insulating rod and a preparation method thereof, and belongs to the technical field of insulating rods. The insulating rod prepared by the invention is composed of an insulating rod and an operating rod, wherein the material of the insulating rod includes the following raw materials by weight: 52-68 parts of polypropylene resin, 15-25 parts of high-density polyethylene, 10-20 parts of polydicyclopentadiene, 0.1-0.3 parts of initiator, 5-10 parts of modified glass fiber, 4-12 parts of multi-effect anti-aging agent, and 1-3 parts of lubricant. With polypropylene as the matrix and high-density polyethylene added, the insulating rod is endowed with lightness, insulation and certain mechanical properties; wherein the modified short-cut glass fiber can greatly enhance the mechanical properties of the insulating rod; the multi-effect anti-aging agent can significantly enhance the aging resistance, flame retardancy and mechanical properties of the insulating rod, and the performance is long-lasting; therefore, the insulating rod prepared by the invention is light, has good insulation, and also has stable and efficient aging resistance, flame retardancy and mechanical properties, and has important application value in the technical field of insulating rods.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating rods, and in particular, relates to an aging-resistant lightweight insulating rod and a preparation method thereof. Background Art

[0002] An insulating rod is an insulating tool used for live work in power systems. It is mainly used for short-term operation of live equipment, such as connecting or disconnecting high-voltage disconnectors, drop fuses, etc. They are usually classified according to length and voltage level. The length ranges from 3 meters to 10 meters, and the voltage level ranges from 10KV to 500KV. The material of the insulating rod is generally glass fiber reinforced plastic epoxy resin rod, which can be formed by hand rolling or mechanical pultrusion. This material has high strength and good insulation, but this material is heavy. Workers will suffer arm fatigue after using it for a period of time during live maintenance, which will reduce the operating accuracy of the workers and may even lead to safety risks.

[0003] Polypropylene is a thermoplastic plastic. The finished product has high surface hardness, high elasticity, good heat resistance, chemical stability, insulation, and light specific gravity. Using it as the raw material of the insulating rod can greatly reduce the weight of the insulating rod and make it lightweight. However, polypropylene has poor aging resistance. After long-term use, oxygen in the air will oxidize polypropylene, reducing its mechanical properties; not only that, the oxygen index of polypropylene is 18%, which is a flammable material. Its low oxygen index cannot meet its use in the power system, so it is necessary to add flame retardants to improve the flame retardant properties of polypropylene. However, the commonly used flame retardants on the market are still mainly halogen and halogen-antimony flame retardants. However, this type of halogen flame retardant material releases a large amount of smoke and toxic and harmful hydrogen halide gas when burning. Because its diffusion rate is much greater than the flame diffusion rate, it is easy to hinder the rapid evacuation of personnel and fire extinguishing work, causing serious impact and loss of people's life and property safety. Therefore, it is urgent to solve the above problems to meet the higher demands in the field of insulating rod technology. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an aging-resistant lightweight insulating rod and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An aging-resistant lightweight insulating rod comprises an insulating rod and an operating rod. The insulating rod and one end of the operating rod are provided with threads. The operating rod is detachably connected to one end of the insulating rod, and an operating hook is provided on the operating rod.

[0007] An aging-resistant lightweight insulating rod is prepared by the following steps:

[0008] The insulating rod and the threaded end of the operating rod are combined to obtain an aging-resistant lightweight insulating rod.

[0009] Furthermore, the material of the insulating rod is prepared by the following steps:

[0010] After mixing polypropylene resin, high-density polyethylene and polydicyclopentadiene, place them in an oven to dry for 12 hours, add them into a mixer with initiator, modified glass fiber, multi-effect anti-aging agent and lubricant, mix for 2 hours, put them into a twin-screw extruder, melt blend and extrude to obtain the material of the insulating rod.

[0011] Furthermore, the raw materials are calculated in parts by weight as follows: 52-68 parts of polypropylene resin, 15-25 parts of high-density polyethylene, 10-20 parts of polydicyclopentadiene, 0.1-0.3 parts of initiator, 5-10 parts of modified glass fiber, 4-12 parts of multi-effect anti-aging agent, and 1-3 parts of lubricant.

[0012] Furthermore, the initiator is one of benzoyl peroxide and lauroyl peroxide.

[0013] Furthermore, the lubricant is one of paraffin and epoxidized soybean oil.

[0014] With polypropylene as the matrix, the material is endowed with lightness and good insulation properties. The addition of high-density polyethylene has good compatibility with polypropylene, is easy to process, and can also enhance the mechanical properties of the material. The added polydicyclopentadiene is light in weight, has good insulation properties, and can further improve the mechanical strength of the material.

[0015] Furthermore, the modified glass fiber is prepared by the following steps:

[0016] The chopped glass fiber was soaked in acetone for 12 hours, washed with distilled water, dried in an oven, added to an ethanol aqueous solution, and then added with silane coupling agent KH-560. The temperature was controlled to 85°C and the reaction was kept warm for 5 hours with constant stirring. The pH value was adjusted to 5 with glacial acetic acid and vacuum dried for 2 hours to obtain modified glass fiber.

[0017] Furthermore, the ratio of the chopped glass fiber, acetone, ethanol aqueous solution, and silane coupling agent KH-560 is 1 g: 100 mL: 100 mL: 7.5 g.

[0018] Furthermore, the chopped glass fiber monofilaments have an average diameter of 10-20 μm and a length of 9-12 mm.

[0019] Chopped glass fibers have good reinforcing and filling effects. The chopped glass fibers are modified with silane coupling agent KH-560, that is, an organic layer is formed on the surface, which can greatly improve the interfacial compatibility between the chopped glass fibers and the polypropylene matrix, thereby promoting the uniform dispersion of the chopped glass fibers in the matrix, reducing the agglomeration phenomenon, giving full play to the performance of the chopped glass fibers, and greatly improving the mechanical properties of the material.

[0020] Furthermore, the multi-effect anti-aging agent is prepared by the following steps:

[0021] S1. Mix 2-methyl-6-tert-butylphenol and potassium hydroxide in a three-necked flask with a thermometer and a reflux device, introduce nitrogen into the device, and control the reaction temperature to 55°C under nitrogen protection. After the reaction is kept warm for 1 hour, methyl acrylate is added dropwise. After the addition is complete, the temperature is raised to 135°C and the reaction is carried out for 4 hours. After the reaction is completed, the mixture is cooled to room temperature, toluene is added, and the pH is adjusted to 7 with a hydrochloric acid solution (mass fraction 8%). The mixture is allowed to stand to separate the aqueous phase and the organic phase, and the toluene is removed by vacuum distillation of the organic phase. The temperature is continued to be raised, and the fraction between 190-210°C is collected as intermediate 1; the ratio of 2-methyl-6-tert-butylphenol, potassium hydroxide and methyl acrylate is 16.4g:0.5g:9.1g;

[0022] Under the catalysis of potassium hydroxide, 2-methyl-6-tert-butylphenol reacts with methyl acrylate to obtain intermediate 1; the specific reaction process is as follows:

[0023]

[0024] S2. Add intermediate 1, thiodiethanol, lithium diisopropylamide (catalyst, LAD) and N,N-dimethylformamide (DMF) to a three-necked flask equipped with a stirring device, stir and mix evenly, pass nitrogen to remove air, heat to 85°C, react for 6 hours, and after the reaction is completed, remove the solvent by vacuum distillation, wash with anhydrous ethanol 2-3 times to obtain intermediate 2; the ratio of intermediate 1, thiodiethanol, lithium diisopropylamide and N,N-dimethylformamide is 24.9g:14.3g:0.4g:100mL;

[0025] Under the catalysis of lithium diisopropylamide, intermediate 1 undergoes an ester exchange reaction with thiodiethanol. By controlling the molar ratio of the two to be close to 1:1 and a slight excess of thiodiethanol, only one hydroxyl group on thiodiethanol participates in the reaction to obtain intermediate 2. The specific reaction process is as follows:

[0026]

[0027] S3, in a three-necked flask equipped with a stirring reflux device, the intermediate 2, dichloromethylphosphine and N, N-dimethylformamide were mixed, potassium carbonate was added, the temperature was controlled to react at 70 ° C for 5 hours, the reaction was completed, filtered, and part of the solvent was removed by vacuum distillation, and then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate, and the volume ratio of the two was 1:2), and the eluent was removed by rotary evaporation to obtain intermediate 3; the ratio of the amount of intermediate 2, dichloromethylphosphine, N, N-dimethylformamide, and potassium carbonate was 33.9 g: 15.2 g: 150 mL: 6.4 g;

[0028] Potassium carbonate is used as an acid binding agent to remove the hydrogen chloride generated by the reaction to accelerate the reaction. Intermediate 2 undergoes a nucleophilic substitution reaction with dichloromethylphosphine. By controlling the molar ratio of the two to be close to 1:1 and the dichloromethylphosphine to be slightly excessive, only one -Cl on the dichloromethylphosphine participates in the reaction to obtain intermediate 3. The specific reaction process is shown below:

[0029]

[0030] S4. At room temperature, under nitrogen protection, in a three-necked flask equipped with a stirring device, the intermediate 3, 3-butene-1-amine, potassium carbonate and N,N-dimethylformamide were mixed and stirred uniformly, the reaction temperature was controlled to 65°C, and the reaction was kept warm for 4 hours. After the reaction was completed, it was filtered, and part of the solvent was distilled off under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate, and the volume ratio of the two was 2:3), and the eluent was removed by rotary evaporation to obtain a multi-effect anti-aging agent; the ratio of the amount of intermediate 3, 3-butene-1-amine, potassium carbonate, and N,N-dimethylformamide was 43.6g:7.1g:6.5g:100mL;

[0031] Intermediate 3 and 3-butene-1-amine undergo nucleophilic substitution, and potassium carbonate removes hydrogen chloride generated by the reaction to obtain a multi-effect anti-aging agent; the specific reaction process is as follows:

[0032]

[0033] The prepared multi-effect anti-aging agent belongs to a thioether type phenolic antioxidant, which has the synergistic effect of thio-auxiliary antioxidants and phenolic antioxidants, and can greatly enhance the aging resistance of the polypropylene matrix; moreover, the phenolic antioxidant is a semi-hindered phenolic antioxidant, and compared with the traditional fully hindered phenolic antioxidant, it has an ortho-substituent with an appropriate spatial steric effect, which reduces the bond dissociation energy between the phenolic hydroxyl groups and increases the collision probability between the phenolic hydroxyl groups and the system free radicals, has a high ability to scavenge free radicals, and can greatly enhance the heat aging resistance of the matrix; in addition, the thioether group can also improve the mechanical properties of the polypropylene matrix; in addition; the multi-effect anti-aging agent also contains PN flame retardant components and carbon-carbon double bonds, among which the PN flame retardant components have the synergistic flame retardant effect of phosphorus and nitrogen flame retardants, and can greatly improve the flame retardant properties of the matrix; finally, one end of the multi-effect anti-aging agent contains a carbon-carbon double bond, which can be cross-linked with the matrix during the melting process, thereby enhancing the interaction force with the matrix, making it difficult for the multi-effect anti-aging agent to migrate and seep out, and improving the stability of the multi-effect anti-aging agent.

[0034] Beneficial effects of the present invention:

[0035] 1. The insulating rod prepared by the present invention is composed of an insulating rod and an operating rod, wherein the insulating rod material is based on polypropylene and is added with high-density polyethylene, which gives the insulating rod lightness, insulation and certain mechanical properties;

[0036] 2. By modifying the chopped glass fibers, compared with ordinary chopped glass fibers, the compatibility with the polypropylene matrix is ​​better, the agglomeration phenomenon is significantly reduced, and the mechanical properties of the insulating rod are greatly enhanced;

[0037] 3. The various groups in the molecules of the multi-effect anti-aging agent play a synergistic role, significantly enhancing the aging resistance, flame retardancy and mechanical properties of the insulating rod, and the performance is long-term and stable;

[0038] Therefore, the insulating rod prepared by the present invention is light in weight, has good insulation, and also has stable and efficient aging resistance, flame retardancy and mechanical properties, and has important application value in the technical field of insulating rods. DETAILED DESCRIPTION

[0039] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0040] Embodiment 1

[0041] Preparation of multi-effect anti-aging agent:

[0042] S1. In a three-necked flask equipped with a thermometer and a reflux device, 16.4 g of 2-methyl-6-tert-butylphenol and 0.5 g of potassium hydroxide were mixed, nitrogen was introduced into the device, and the reaction temperature was controlled to be 55°C under nitrogen protection. After the reaction was kept warm for 1 hour, 9.1 g of methyl acrylate was added dropwise. After the addition was complete, the temperature was raised to 135°C and the reaction was carried out for 4 hours. After the reaction was completed, the mixture was cooled to room temperature, toluene was added, and the pH was adjusted to 7 with hydrochloric acid solution (mass fraction 8%). The mixture was allowed to stand to separate the aqueous phase and the organic phase. The toluene was removed by vacuum distillation from the organic phase. The temperature was continued to be raised, and the fraction between 190°C and 210°C was collected as the intermediate 1.

[0043] S2. Add 24.9 g of intermediate 1, 14.3 g of thiodiethanol, 0.4 g of lithium diisopropylamide and 100 mL of N,N-dimethylformamide into a three-necked flask equipped with a stirring device, stir and mix evenly, pass nitrogen to remove all air, heat to 85°C, react for 6 hours, and after the reaction is completed, remove the solvent by distillation under reduced pressure, wash 3 times with anhydrous ethanol to obtain intermediate 2;

[0044] S3, in a three-necked flask equipped with a stirring reflux device, 33.9 g of intermediate 2, 15.2 g of dichloromethylphosphine and 150 mL of N, N-dimethylformamide were mixed, and 6.4 g of potassium carbonate was added, and the temperature was controlled to react at 70 ° C for 5 h. After the reaction was completed, it was filtered, and part of the solvent was distilled off under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate, and the volume ratio of the two was 1:2), and the eluent was removed by rotary evaporation to obtain intermediate 3;

[0045] S4. At room temperature, under nitrogen protection, 43.6 g of intermediate 3, 7.1 g of 3-butene-1-amine, 6.5 g of potassium carbonate and 100 mL of N,N-dimethylformamide were mixed and stirred evenly in a three-necked flask equipped with a stirring device. The reaction temperature was controlled to 65°C and the reaction was kept warm for 4 hours. After the reaction was completed, it was filtered and part of the solvent was removed by distillation under reduced pressure. Then it was purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate in a volume ratio of 2:3), and the eluent was removed by rotary evaporation to obtain a multi-effect anti-aging agent.

[0046] Embodiment 2

[0047] Preparation of multi-effect anti-aging agent:

[0048] S1. In a three-necked flask equipped with a thermometer and a reflux device, 32.8 g of 2-methyl-6-tert-butylphenol and 1.0 g of potassium hydroxide were mixed, nitrogen was introduced into the device, and the reaction temperature was controlled to be 55° C. under nitrogen protection. After the reaction was kept warm for 1 hour, 18.2 g of methyl acrylate was added dropwise. After the addition was complete, the temperature was raised to 135° C. and the reaction was carried out for 4 hours. After the reaction was completed, the mixture was cooled to room temperature, toluene was added, and the pH was adjusted to 7 with hydrochloric acid solution (mass fraction 8%). The mixture was allowed to stand to separate the aqueous phase and the organic phase. The toluene was removed by vacuum distillation from the organic phase. The temperature was continued to be raised, and the fraction between 190° C. and 210° C. was collected as the intermediate 1.

[0049] S2. Add 49.8 g of intermediate 1, 28.6 g of thiodiethanol, 0.8 g of lithium diisopropylamide and 200 mL of N,N-dimethylformamide into a three-necked flask equipped with a stirring device, stir and mix evenly, pass nitrogen to remove all air, heat to 85°C, react for 6 hours, and after the reaction is completed, remove the solvent by distillation under reduced pressure, wash twice with anhydrous ethanol to obtain intermediate 2;

[0050] S3, in a three-necked flask equipped with a stirring reflux device, 67.8g of intermediate 2, 30.4g of dichloromethylphosphine and 300mL of N,N-dimethylformamide were mixed, and 12.8g of potassium carbonate was added, and the temperature was controlled to react at 70°C for 5h. After the reaction was completed, it was filtered, and part of the solvent was distilled off under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate, and the volume ratio of the two was 1:2), and the eluent was removed by rotary evaporation to obtain intermediate 3;

[0051] S4. At room temperature, under nitrogen protection, in a three-necked flask equipped with a stirring device, 87.2 g of intermediate 3, 14.2 g of 3-butene-1-amine, 13.0 g of potassium carbonate and 200 mL of N,N-dimethylformamide were mixed and stirred evenly, the reaction temperature was controlled to 65°C, and the reaction was kept warm for 4 hours. After the reaction was completed, it was filtered, and part of the solvent was distilled off under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate, and the volume ratio of the two was 2:3), and the eluent was removed by rotary evaporation to obtain a multi-effect anti-aging agent.

[0052] Embodiment 3

[0053] Preparation of modified glass fiber:

[0054] 1 g of chopped glass fiber with an average single fiber diameter of 10 μm and a length of 9 mm was soaked in 100 mL of acetone for 12 h, washed with distilled water, dried in an oven, added to 100 mL of ethanol aqueous solution, and then 7.5 g of silane coupling agent KH-560 was added. The temperature was controlled to 85 ° C. The reaction was kept warm for 5 h with continuous stirring. Glacial acetic acid was used to adjust the pH value to 5 and vacuum dried for 2 h to obtain modified glass fiber.

[0055] Embodiment 4

[0056] Preparation of modified glass fiber:

[0057] 2 g of chopped glass fiber with an average single fiber diameter of 20 μm and a length of 12 mm was soaked in 200 mL of acetone for 12 h, washed with distilled water, dried in an oven, added to 200 mL of ethanol aqueous solution, and then 15.0 g of silane coupling agent KH-560 was added. The temperature was controlled to 85 ° C. The reaction was kept warm for 5 h with continuous stirring. Glacial acetic acid was used to adjust the pH value to 5 and vacuum dried for 2 h to obtain modified glass fiber.

[0058] Embodiment 5

[0059] Materials for making insulating rods:

[0060] 52g of polypropylene resin, 15g of high-density polyethylene and 10g of polydicyclopentadiene were mixed and placed in an oven for drying for 12h. Then, 0.1g of benzoyl peroxide, 5g of modified glass fiber prepared in Example 3, 4g of the multi-effect anti-aging agent prepared in Example 1 and 1g of paraffin were added to a mixer and mixed for 2h. The mixture was then put into a twin-screw extruder for melt blending and extrusion to obtain the material for the insulating rod.

[0061] Embodiment 6

[0062] Materials for making insulating rods:

[0063] 60g of polypropylene resin, 20g of high-density polyethylene and 15g of polydicyclopentadiene were mixed and placed in an oven for drying for 12 hours. Then, 0.2g of lauroyl peroxide, 7.5g of the modified glass fiber prepared in Example 4, 8g of the multi-effect anti-aging agent prepared in Example 2 and 2g of epoxy soybean oil were added to a mixer and mixed for 2 hours. The mixture was then put into a twin-screw extruder for melt blending and extrusion to obtain the material for the insulating rod.

[0064] Embodiment 7

[0065] Materials for making insulating rods:

[0066] 68g of polypropylene resin, 25g of high-density polyethylene and 20g of polydicyclopentadiene were mixed and placed in an oven for drying for 12 hours. Then, 0.3g of lauroyl peroxide, 10g of modified glass fiber prepared in Example 4, 12g of the multi-effect anti-aging agent prepared in Example 2 and 3g of epoxy soybean oil were added to a mixer and mixed for 2 hours. The mixture was then put into a twin-screw extruder for melt blending and extrusion to obtain the material for the insulating rod.

[0067] Embodiment 8

[0068] 68g of polypropylene resin, 25g of high-density polyethylene and 20g of polydicyclopentadiene were mixed and placed in an oven for drying for 12h, and then added with 0.3g of lauroyl peroxide, 10g of modified glass fiber prepared in Example 4, 12g of the multi-effect anti-aging agent prepared in Example 2 and 3g of epoxy soybean oil, and mixed in a mixer for 2h, and then put into a twin-screw extruder, melt-blended, extruded into a hollow tubular mold, and allowed to stand for cooling to obtain an insulating rod, which was combined with an operating rod with a thread set at one end to obtain an aging-resistant lightweight insulating rod.

[0069] Comparative Example 1

[0070] The multi-effect anti-aging agent in Example 7 was replaced by a commercially available anti-aging agent of equal quality, and the remaining steps were the same as those in Example 7 to obtain the material.

[0071] Comparative Example 2

[0072] Commercially available flame retardant polypropylene material was used.

[0073] Embodiments 5, 6 and 7, and comparative examples 1 and 2 were made into corresponding shapes according to different test standards, and the following performance tests were performed:

[0074] Adopt the national standard GB 13398-2003 "Hollow insulating tubes, foam-filled insulating tubes and solid insulating rods for live working" for bending strength, tensile strength and normal resistivity;

[0075] The sample was placed in a xenon lamp aging test chamber for accelerated aging for 30 days. The aging conditions were air atmosphere, xenon lamp wavelength 280-800nm, and irradiation intensity 550W / m 2 , test the tensile strength of the sample after aging (GB 13398-2003), and calculate the tensile strength retention rate; tensile strength retention rate = tensile strength after test / tensile strength before test × 100%;

[0076] The induction time of the sample was determined using the national standard GB / T 19466.6-2009 "Plastics Differential Scanning Calorimetry (DSC) Part 6: Determination of Oxidation Induction Time (Isothermal OIT) and Oxidation Induction Temperature (Dynamic OIT)";

[0077] The national standard GB / T 2406-2008 "Test method for combustion performance of plastics" is used to measure the limiting oxygen index of the sample before and after standing at room temperature for 180 days;

[0078] The measured results are shown in the following table:

[0079]

[0080] It can be seen from the above table that the insulating rod material prepared in the embodiment of the present invention has good insulation, and its aging resistance, flame retardancy and mechanical properties are higher than those of the comparative example, and its performance is long-lasting and stable, and it has important application value in the field of insulating rod technology.

[0081] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An aging-resistant lightweight insulating rod, comprising an insulating rod and an operating rod, characterized in that: The materials of the insulating rod include the following raw materials in parts by weight: 52-68 parts of polypropylene resin, 15-25 parts of high-density polyethylene, 10-20 parts of polydicyclopentadiene, 0.1-0.3 parts of initiator, 5-10 parts of modified glass fiber, 4-12 parts of multi-effect anti-aging agent, and 1-3 parts of lubricant.

2. The aging-resistant lightweight insulating rod according to claim 1, characterized in that: The multi-effect anti-aging agent is prepared by the following steps: S1. Mix 2-methyl-6-tert-butylphenol and potassium hydroxide, introduce nitrogen into the device, react at 55°C for 1 hour under nitrogen protection, then drop methyl acrylate, raise the temperature to 135°C after the addition is complete, react for 4 hours, cool to room temperature, add toluene, adjust pH to 7 with hydrochloric acid solution, stand to separate aqueous phase and organic phase, take the organic phase and distill under reduced pressure, continue to raise the temperature, and collect the fraction as intermediate 1; S2, stirring and mixing the intermediate 1, dithiodiethanol, lithium diisopropylamide and N,N-dimethylformamide, introducing nitrogen, heating to 85°C, reacting for 6 hours, and after the reaction is complete, distilling under reduced pressure and washing to obtain the intermediate 2; S3, mixing intermediate 2, dichloromethylphosphine and N,N-dimethylformamide, adding potassium carbonate, reacting at 70°C for 5 hours, filtering, distilling under reduced pressure, purifying by column chromatography, and rotary evaporating to obtain intermediate 3; S4. At room temperature, under nitrogen protection, mix and stir the intermediate 3, 3-butene-1-amine, potassium carbonate and N,N-dimethylformamide evenly, react at 65°C for 4 hours. After the reaction is completed, filter, distill under reduced pressure, purify by column chromatography, and rotary evaporate to obtain a multi-effect anti-aging agent.

3. The aging-resistant lightweight insulating rod according to claim 2, characterized in that: In step S1, the ratio of 2-methyl-6-tert-butylphenol, potassium hydroxide and methyl acrylate is 16.4 g:0.5 g:9.1 g.

4. The aging-resistant lightweight insulating rod according to claim 2, characterized in that: In step S2, the ratio of the amount of intermediate 1, thiodiethanol, lithium diisopropylamide, and N,N-dimethylformamide is 24.9 g:14.3 g:0.4 g:100 mL.

5. The ageing-resistant lightweight insulating rod according to claim 2, characterized in that: In step S3, the ratio of the amount of intermediate 2, dichloromethylphosphine, N,N-dimethylformamide and potassium carbonate is 33.9 g:15.2 g:150 mL:6.4 g.

6. The ageing-resistant lightweight insulating rod according to claim 2, characterized in that: In step S4, the ratio of the amount of intermediate 3, 3-butene-1-amine, potassium carbonate, and N,N-dimethylformamide is 43.6 g:7.1 g:6.5 g:100 mL.

7. The ageing-resistant lightweight insulating rod according to claim 1, characterized in that: The modified glass fiber is prepared by the following steps: The chopped glass fiber was soaked in acetone for 12 hours, washed with distilled water, dried in an oven, added to an ethanol aqueous solution, and then added with silane coupling agent KH-560. The temperature was controlled to 85°C and the reaction was kept warm for 5 hours with constant stirring. The pH value was adjusted to 5 with glacial acetic acid and vacuum dried for 2 hours to obtain modified glass fiber.

8. The ageing-resistant lightweight insulating rod according to claim 7, characterized in that: The ratio of the chopped glass fiber, acetone, ethanol aqueous solution, and silane coupling agent KH-560 is 1g:100mL:100mL:7.5g.

9. The method for preparing an aging-resistant lightweight insulating rod according to claim 1, characterized in that: The following steps are involved: The insulating rod and the threaded end of the operating rod are combined to obtain an aging-resistant lightweight insulating rod.

Images