An insulating rod body material with high corrosion resistance and a preparation method thereof

Abstract

The present invention discloses an insulating rod body material with high corrosion resistance and a preparation method thereof, belonging to the technical field of insulating rods. The material comprises the following raw materials in parts by weight: 80-100 parts of bisphenol epoxy resin, 20-30 parts of polydicyclopentadiene, 6-18 parts of modified glass fiber, 1-3 parts of curing agent, 5-15 parts of modifier, and 2-4 parts of lubricant. The rod body material is based on bisphenol epoxy resin, which gives the rod body material corrosion resistance; by adding modified glass fiber, the compatibility with the epoxy resin matrix is ​​good, which greatly enhances the mechanical properties of the rod body material; the various groups in the prepared modifier act synergistically, improving the flame retardant, heat resistant and antioxidant properties of the rod body material, further enhancing the corrosion resistance and mechanical properties of the rod body material, and the performance is long-lasting and stable; therefore, the rod body material prepared by the present invention has stable and efficient flame retardant, heat resistant, antioxidant and corrosion resistant properties, and excellent mechanical properties, and has important application value in the field of insulating rod technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating rods, and in particular relates to an insulating rod body material with high corrosion resistance and a preparation method thereof. Background Art

[0002] The insulating rod, also known as the switch rod or the link rod, consists of two parts: the working head and the insulating rod body. It is an insulating tool mainly used for short-term operation of live equipment, such as connecting or disconnecting high-voltage disconnectors, drop fuses, installing and removing portable grounding wires, and for measurement and testing. The insulating rod is one of the most commonly used safety tools for grassroots rural power workers and is widely used in power work.

[0003] The performance of insulating rods mainly depends on the rod material of the insulating rod. At present, solid composite insulating materials are widely used as the rod material of insulating rods. Among these materials, epoxy resin is widely used as the rod material of insulating rods due to its excellent corrosion resistance. However, epoxy resin has poor aging resistance. If used for a long time, oxygen in the air will oxidize the epoxy resin, thereby reducing its mechanical properties. Moreover, the oxygen index of epoxy resin is low, which poses a high safety risk when engaged in electrical work, limiting its use. 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 insulating rod body material with high corrosion resistance and a preparation method thereof.

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

[0006] A method for preparing an insulating rod body material with high corrosion resistance comprises the following steps:

[0007] Bisphenol epoxy resin, polydicyclopentadiene, modified glass fiber, curing agent, modifier and lubricant are mixed and added into a high-speed mixer. Mix for 30 minutes to fully mix the components. Pour the mixture into a twin-screw extruder for melt blending and extrusion. After discharging, the material is cooled to room temperature to obtain an insulating rod body material with high corrosion resistance.

[0008] Furthermore, the raw materials are calculated in parts by weight as follows: 80-100 parts of bisphenol epoxy resin, 20-30 parts of polydicyclopentadiene, 6-18 parts of modified glass fiber, 1-3 parts of curing agent, 5-15 parts of modifier, and 2-4 parts of lubricant.

[0009] Furthermore, the curing agent is one of 2-methylimidazole, 2-ethyl-4-methylimidazole, and 2-ethylimidazole.

[0010] Furthermore, the lubricant is one of paraffin and epoxidized soybean oil.

[0011] With bisphenol epoxy resin as the matrix, the rod material is endowed with excellent corrosion resistance; the added polydicyclopentadiene not only has good insulation properties, but also can improve the heat resistance and mechanical properties of the rod material.

[0012] Furthermore, the modified glass fiber is prepared by the following steps:

[0013] A1. Add glass fiber to a beaker, then add hydrogen peroxide dropwise, stir and mix thoroughly, heat to 110°C, reflux for 4-6 hours, filter, and dry to obtain hydroxylated glass fiber;

[0014] A2. Mix the hydroxylated glass fiber obtained in step A1 with acetone and silane coupling agent KH-550, heat to 85° C., react for 4-6 hours, filter, and vacuum dry to obtain modified glass fiber.

[0015] Furthermore, the raw materials are calculated in parts by weight as follows: 1-5 parts of glass fiber, 20-40 parts of hydrogen peroxide, 40-60 parts of acetone, and 5-15 parts of silane coupling agent KH-550.

[0016] Glass fiber is a high-strength filling material. By using the silane coupling agent KH-550 to modify the surface of the glass fiber, its surface hydrophobicity is enhanced, which can improve the compatibility of the glass fiber with the epoxy resin matrix, make the modified glass fiber evenly dispersed in the matrix, reduce the occurrence of agglomeration, and greatly enhance the mechanical strength of the insulating rod material.

[0017] Furthermore, the modifier is prepared by the following steps:

[0018] S1. Add methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tetrafluorobutanediol, 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 80°C, and keep the reaction for 6 hours. After the reaction is completed, remove the solvent by distillation under reduced pressure, and wash with anhydrous ethanol 2-3 times to obtain intermediate 1; the ratio of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tetrafluorobutanediol, lithium diisopropylamide and N,N-dimethylformamide is 29.2g:17.5g:0.4g:150mL;

[0019] Under the catalysis of lithium diisopropylamide, methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tetrafluorobutanediol undergo an ester exchange reaction. By controlling the molar ratio of the two to be close to 1:1 and a slight excess of tetrafluorobutanediol, only one hydroxyl group on the tetrafluorobutanediol participates in the reaction, yielding intermediate 1. The specific reaction process is shown below:

[0020]

[0021] S2, in a three-necked flask equipped with a stirring reflux apparatus, intermediate 1, phenylphosphonic dichloride and toluene were mixed, and then diethylamine (acid binding agent) was added, and the temperature was controlled to react at 65 ° C for 6h. After the reaction was completed, diethylamine hydrochloride was filtered, and part of the solvent was removed by distillation under reduced pressure. The mixture was purified by column chromatography (eluent was a mixed solvent of benzene / ethyl acetate in a volume ratio of 2:1), and the eluent was removed by rotary evaporation to obtain intermediate 2; the ratio of the amount of intermediate 1, phenylphosphonic dichloride, toluene and diethylamine was 42.2g:20.2g:150mL:15mL;

[0022] Intermediate 1 undergoes a nucleophilic substitution reaction with phenylphosphonyl dichloride. By controlling the molar ratio of the two to be close to 1:1 and a slight excess of phenylphosphonyl dichloride, only one -Cl group on the phenylphosphonyl dichloride participates in the reaction. Diethylamine removes the hydrogen chloride generated in the reaction to obtain intermediate 2. The specific reaction process is shown below:

[0023]

[0024] S3. At room temperature, intermediate 2, 1,3-propylenediamine, diethylamine and toluene were mixed and stirred uniformly in a three-necked flask equipped with a stirring device. Nitrogen was introduced into the device as a protective gas, and the temperature was gradually raised to 60° C. The reaction was kept warm for 5 hours. After the reaction was completed, diethylamine hydrochloride was removed by filtration, and part of the solvent was removed by distillation under reduced pressure. The product was purified by column chromatography (eluent: a mixed solvent of benzene / ethyl acetate in a volume ratio of 2:3), and the eluent was removed by rotary evaporation to obtain intermediate 3; the ratio of the amount of intermediate 2, 1,3-propylenediamine, diethylamine and toluene was 57.9 g:8.4 g:15 mL:150 mL;

[0025] Intermediate 2 and 3-propylenediamine undergo nucleophilic substitution, and diethylamine removes the hydrogen chloride generated in the reaction to obtain intermediate 3. The specific reaction process is as follows:

[0026]

[0027] S4. In a three-necked flask equipped with a stirring device, p-phenylenediisocyanate, intermediate 3 and dimethyl sulfoxide (DMSO) were mixed, tributyltin (catalyst) was added and the mixture was stirred evenly, the temperature was gradually increased to 70° C., and the reaction was kept warm for 6 h. Stirring was continued during the reaction. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the mixture was dried in vacuo to obtain a modifier; the ratio of p-phenylenediisocyanate, intermediate 3, dimethyl sulfoxide and tributyltin was 17.4 g:61.8 g:200 mL:0.2 g;

[0028] The isocyanate group in p-phenylene diisocyanate reacts with the amino group on intermediate 3 to form a urea group. By controlling the molar ratio of the two to be close to 1:1 and slightly excessive p-phenylene diisocyanate, only one isocyanate group on p-phenylene diisocyanate participates in the reaction to obtain a modifier. The specific reaction process is shown below:

[0029]

[0030] The modifier molecule prepared by the present invention contains a CF bond, a PN flame retardant component, a hindered phenol and an isocyanate group, wherein the CF bond has a small polarity and a strong bond energy. The higher the chemical bond energy, the better the stability. It not only improves the heat resistance of the epoxy resin matrix, but also the CF bond can well coat the CC main chain, thereby improving the corrosion resistance of the matrix. The introduced PN flame retardant component has a synergistic flame retardant effect of phosphorus and nitrogen flame retardants, which can greatly improve the flame retardant performance of the matrix. The introduced hindered phenol group belongs to a phenolic antioxidant. The structure of this type of antioxidant contains an -OH functional group, which is relatively easy to react with. It is easy to provide H atoms, and this process is achieved through proton donation, which destroys the auto-oxidation of free radicals in the chain reaction, achieves an antioxidant effect, and can enhance the antioxidant properties of the matrix; finally, the isocyanate group in the modifier molecule can react with the epoxy group in the epoxy resin matrix to generate a five-membered ring oxazolidone structure, which can further improve the heat resistance of the epoxy resin matrix and enhance the mechanical properties of the matrix to a certain extent; not only that, the modifier and the epoxy resin matrix are connected by chemical bonds, which improves the migration and exudation resistance of the modifier small molecule and improves the stability of the modifier.

[0031] Beneficial effects of the present invention:

[0032] 1. The rod material prepared by the present invention uses bisphenol epoxy resin as a matrix, which gives the rod material excellent corrosion resistance;

[0033] 2. By adding modified glass fiber, compared with ordinary glass fiber, it has better compatibility with the epoxy resin matrix, significantly reduces the agglomeration phenomenon, and greatly enhances the mechanical properties of the rod material;

[0034] 3. The various groups in the prepared modifier work synergistically, significantly improving the flame retardancy, heat resistance and oxidation resistance of the rod material, further enhancing the corrosion resistance and mechanical properties of the rod material, and the performance is long-lasting and stable;

[0035] Therefore, the rod material prepared by the present invention has stable and efficient flame retardant, heat-resistant, antioxidant and corrosion-resistant properties, as well as excellent mechanical properties, and has important application value in the field of insulating rod technology. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1

[0038] Preparation of modifier:

[0039] S1. In a three-necked flask equipped with a stirring device, 29.2 g of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 17.5 g of tetrafluorobutanediol, 0.4 g of lithium diisopropylamide and 150 mL of N,N-dimethylformamide were added. After stirring and mixing, nitrogen was passed through to remove all air. The temperature was raised to 80° C. and the reaction was kept at this temperature for 6 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the mixture was washed with anhydrous ethanol 2-3 times to obtain intermediate 1;

[0040] S2, in a three-necked flask equipped with a stirring reflux apparatus, 42.2 g of intermediate 1, 20.2 g of phenylphosphonic dichloride and 150 mL of toluene were mixed, and then 15 mL of diethylamine was added. The temperature was controlled to react at 65 ° C for 6 h. After the reaction was completed, diethylamine hydrochloride was filtered, and part of the solvent was removed by distillation under reduced pressure. Then, the product was purified by column chromatography (eluent: a mixed solvent of benzene / ethyl acetate, the volume ratio of the two was 2:1), and the eluent was removed by rotary evaporation to obtain intermediate 2;

[0041] S3, at room temperature in a three-necked flask equipped with a stirring device, 57.9g of intermediate 2, 8.4g of 1,3-propylenediamine, 15mL of diethylamine and 150mL of toluene were mixed and stirred evenly, nitrogen was introduced into the device as a protective gas, and the temperature was gradually raised to 60°C. The reaction was kept warm for 5h. After the reaction was completed, diethylamine hydrochloride was filtered out, and part of the solvent was removed by distillation under reduced pressure. The product was purified by column chromatography (eluent: a mixed solvent of benzene / ethyl acetate, the volume ratio of the two was 2:3), and the eluent was removed by rotary evaporation to obtain intermediate 3;

[0042] S4. In a three-necked flask equipped with a stirring device, 17.4 g of p-phenylene diisocyanate, 61.8 g of intermediate 3 and 200 mL of dimethyl sulfoxide were mixed, 0.2 g of tributyltin was added and the mixture was stirred evenly, the temperature was gradually increased to 70°C, and the mixture was kept warm for 6 hours with continuous stirring during the reaction. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the mixture was dried in vacuo to obtain a modifier.

[0043] Example 2

[0044] Preparation of modifier:

[0045] S1. In a three-necked flask equipped with a stirring device, 58.4 g of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 35 g of tetrafluorobutanediol, 0.8 g of lithium diisopropylamide and 300 mL of N,N-dimethylformamide were added. After stirring and mixing, nitrogen was passed through to remove all air. The temperature was raised to 80° C. and the reaction was kept at this temperature for 6 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the mixture was washed twice with anhydrous ethanol to obtain intermediate 1;

[0046] S2, in a three-necked flask equipped with a stirring reflux apparatus, 84.4 g of intermediate 1, 40.4 g of phenylphosphonic dichloride and 300 mL of toluene were mixed, and then 30 mL of diethylamine was added. The temperature was controlled to react at 65 ° C for 6 h. After the reaction was completed, diethylamine hydrochloride was filtered, and part of the solvent was removed by distillation under reduced pressure. Then, the product was purified by column chromatography (eluent: a mixed solvent of benzene / ethyl acetate, the volume ratio of the two was 2:1), and the eluent was removed by rotary evaporation to obtain intermediate 2;

[0047] S3, at room temperature in a three-necked flask equipped with a stirring device, 115.8g of intermediate 2, 16.8g of 1,3-propylenediamine, 30mL of diethylamine and 300mL of toluene were mixed and stirred uniformly, nitrogen was introduced into the device as a protective gas, and the temperature was gradually raised to 60°C. The reaction was kept warm for 5h. After the reaction was completed, diethylamine hydrochloride was filtered out, and part of the solvent was removed by distillation under reduced pressure. The product was purified by column chromatography (eluent: a mixed solvent of benzene / ethyl acetate, the volume ratio of the two was 2:3), and the eluent was removed by rotary evaporation to obtain intermediate 3;

[0048] S4. In a three-necked flask equipped with a stirring device, 34.8 g of p-phenylene diisocyanate, 123.6 g of intermediate 3 and 400 mL of dimethyl sulfoxide were mixed, 0.4 g of tributyltin was added and the mixture was stirred evenly, the temperature was gradually increased to 70°C, and the mixture was kept warm for 6 hours with continuous stirring during the reaction. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the mixture was dried in vacuo to obtain a modifier.

[0049] Example 3

[0050] Preparation of modified glass fiber:

[0051] A1. Add 1 g of glass fiber to a beaker, then add 20 g of hydrogen peroxide dropwise, stir and mix thoroughly, heat to 110°C, reflux for 4 h, filter, and dry to obtain hydroxylated glass fiber;

[0052] A2. Mix the hydroxylated glass fiber obtained in step A1 with 40 g of acetone and 5 g of silane coupling agent KH-550, heat to 85° C., react for 4 h, filter, and vacuum dry to obtain modified glass fiber.

[0053] Example 4

[0054] Preparation of modified glass fiber:

[0055] A1. Add 5 g of glass fiber to a beaker, then add 40 g of hydrogen peroxide dropwise, stir and mix thoroughly, heat to 110°C, reflux for 6 h, filter, and dry to obtain hydroxylated glass fiber;

[0056] A2. The hydroxylated glass fiber obtained in step A1 was mixed with 60 g of acetone and 15 g of silane coupling agent KH-550, and the mixture was heated to 85° C. and reacted for 6 h. After the reaction was complete, the mixture was filtered and vacuum dried to obtain modified glass fiber.

[0057] Example 5

[0058] 80 g of bisphenol epoxy resin, 20 g of polydicyclopentadiene, 6 g of the modified glass fiber prepared in Example 3, 1 g of 2-methylimidazole, 5 g of the modifier prepared in Example 1, and 2 g of paraffin were mixed and added to a high-speed mixer. Mixing was carried out for 30 minutes to fully mix the components. The mixture was then poured into a twin-screw extruder for melt blending and extrusion. After discharge, the material was cooled to room temperature to obtain an insulating rod body material with high corrosion resistance.

[0059] Example 6

[0060] 90 g of bisphenol epoxy resin, 25 g of polydicyclopentadiene, 12 g of the modified glass fiber prepared in Example 4, 2 g of 2-ethyl-4-methylimidazole, 10 g of the modifier prepared in Example 2, and 3 g of paraffin were mixed and added to a high-speed mixer. Mixing was carried out for 30 minutes to fully mix the components. The mixture was then poured into a twin-screw extruder for melt blending and extrusion. After discharge, the material was cooled to room temperature to obtain an insulating rod body material with high corrosion resistance.

[0061] Example 7

[0062] 100 g of bisphenol epoxy resin, 30 g of polydicyclopentadiene, 18 g of the modified glass fiber prepared in Example 4, 3 g of 2-ethylimidazole, 15 g of the modifier prepared in Example 2, and 4 g of epoxy soybean oil were mixed and added to a high-speed mixer. Mixing was carried out for 30 minutes to fully mix the components. The mixture was then poured into a twin-screw extruder for melt blending and extrusion. After discharge, the material was cooled to room temperature to obtain an insulating rod body material with high corrosion resistance.

[0063] Comparative Example 1

[0064] The modifier in Example 7 was replaced by a commercially available flame retardant of equal mass, and the remaining steps were the same as in Example 7 to prepare a rod material.

[0065] Comparative Example 2

[0066] Use commercially available corrosion-resistant epoxy resin materials.

[0067] Examples 5, 6 and 7, and Comparative Examples 1 and 2 were made into corresponding shapes according to different test standards and subjected to the following performance tests:

[0068] The tensile strength and normal resistivity are measured using the national standard GB 13398-2003 "Hollow insulating tubes, foam-filled insulating tubes and solid insulating rods for live working";

[0069] 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 (GB13398-2003) and calculate the tensile strength retention rate; tensile strength retention rate = tensile strength after test / tensile strength before test × 100%;

[0070] Thermal aging test: Place the sample in an environment of 160°C and let it stand for 12 hours. Then test the tensile strength of the sample (GB13398-2003) and calculate the tensile strength retention rate.

[0071] Determine the tensile strength of the sample after alkali treatment and acid treatment (GB 13398-2003), and calculate the tensile strength retention rate;

[0072] Alkali treatment: sodium hydroxide solution with a pH of 13 in a 55°C water bath for 4 hours;

[0073] Acid treatment: hydrochloric acid solution with a pH value of 2 in a 55°C water bath for 4 h;

[0074] The flame retardant properties of the samples were measured before and after 180 days according to the UL-94 standard;

[0075] The measured results are shown in the following table:

[0076]

[0077] As can be seen from the above table, the rod material prepared in the embodiment of the present invention has higher flame retardancy, heat resistance, oxidation resistance, corrosion resistance and mechanical properties than the comparative example, and its performance is long-lasting and stable, and has important application value in the field of insulating rod technology.

[0078] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] 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 described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing an insulating rod body material with high corrosion resistance, comprising the following steps: Bisphenol epoxy resin, polydicyclopentadiene, modified glass fiber, curing agent, modifier and lubricant are mixed, added into a high-speed mixer, mixed, poured into a twin-screw extruder for melt blending and extrusion, and cooled to room temperature after discharge to obtain an insulating rod body material with high corrosion resistance; Wherein, the structure of the modifier is as follows: 。 2. The method for preparing an insulating rod body material with high corrosion resistance according to claim 1, characterized in that: The modifier is prepared by the following steps: S1. Methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tetrafluorobutanediol, lithium diisopropylamide, and N,N-dimethylformamide were stirred and mixed uniformly, and then nitrogen was passed through to remove all air. The mixture was heated to 80°C and kept at this temperature for 6 hours. After the reaction was completed, the mixture was evaporated under reduced pressure and washed to obtain intermediate 1. S2. Mix intermediate 1, phenylphosphonyl dichloride and toluene, add diethylamine, react at 65°C for 6 hours, filter, distill under reduced pressure, purify by column chromatography, and rotary evaporate to obtain intermediate 2; S3. Mix and stir the intermediate 2, 1,3-propylenediamine, diethylamine and toluene at room temperature, introduce nitrogen into the apparatus, gradually raise the temperature to 60°C, and keep the temperature to react for 5 hours. After the reaction is complete, filter, distill under reduced pressure, purify by column chromatography, and rotary evaporate to obtain intermediate 3; S4. Mix p-phenylene diisocyanate, intermediate 3 and dimethyl sulfoxide, add tributyltin and mix well, gradually increase the temperature to 70°C, keep warm and react for 6 hours, stir continuously during the reaction, and after the reaction is completed, distill under reduced pressure and dry in vacuum to obtain a modifier.

3. The method for preparing an insulating rod body material with high corrosion resistance according to claim 2, characterized in that: In step S1, the usage ratio of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tetrafluorobutanediol, lithium diisopropylamide, and N,N-dimethylformamide is 29.2 g:17.5 g:0.4 g:150 mL; in step S2, the usage ratio of intermediate 1, phenylphosphonic dichloride, toluene, and diethylamine is 42.2 g:20.2 g:150 mL:15 mL; in step S3, the usage ratio of intermediate 2, 1,3-propylenediamine, diethylamine, and toluene is 57.9 g:8.4 g:15 mL:150 mL; in step S4, the usage ratio of p-phenylene diisocyanate, intermediate 3, dimethyl sulfoxide, and tributyltin is 17.4 g:61.8 g:200 mL:0.2 g.

4. The method for preparing an insulating rod body material with high corrosion resistance according to claim 1, characterized in that: The modified glass fiber is prepared by the following steps: A1. Add glass fiber and hydrogen peroxide to a beaker, stir and mix well, heat to 110°C, reflux for 4-6 hours, filter, and dry to obtain hydroxylated glass fiber; A2. Mix the hydroxylated glass fiber obtained in step A1 with acetone and silane coupling agent KH-550, heat to 85° C., react for 4-6 hours, filter, and vacuum dry to obtain modified glass fiber.

5. The method for preparing an insulating rod body material with high corrosion resistance according to claim 4, characterized in that: The raw materials are calculated in parts by weight as follows: 1-5 parts of glass fiber, 20-40 parts of hydrogen peroxide, 40-60 parts of acetone, and 5-15 parts of silane coupling agent KH-550.

6. The method for preparing an insulating rod body material with high corrosion resistance according to claim 1, characterized in that: The raw materials are calculated as follows in parts by weight: 80-100 parts of bisphenol epoxy resin, 20-30 parts of polydicyclopentadiene, 6-18 parts of modified glass fiber, 1-3 parts of curing agent, 5-15 parts of modifier, and 2-4 parts of lubricant.

7. An insulating rod body material with high corrosion resistance, characterized in that: Prepared according to the method according to any one of claims 1 to 6.

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