A nano-modified polyaniline composite material for a power grounding electrode and its preparation process

Abstract

The present application discloses a nano-modified polyaniline composite material for a power grounding electrode and its preparation process, which relates to the field of conductive polymer materials. It includes nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer and additives. The weight ratio of the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer and additives is (4-5):(10-11):(3-4):(1-2). In the preparation process of the conductive composite polymer of the present application, the reinforcing filler and the modified fiber are uniformly dispersed with the nano-modified polyaniline material along with stirring, and the three play a role of mutual filling, so that the mechanical properties of the conductive composite polymer are improved.

Description

Technical Field

[0001] This application relates to the field of conductive polymer materials, and in particular to a nano-modified polyaniline composite material for a power earthing body and its preparation process. Background Art

[0002] An earthing body, also known as an earth electrode, is a metal conductor or a group of conductors that is in direct contact with the soil, and is divided into an artificial earthing body and a natural earthing body. As a conductor that is in close contact with the earth soil and provides an electrical connection with the earth, the earthing body safely dissipates the lightning energy and discharges it into the earth.

[0003] As a new type of functional polymer material, conductive polymers have both excellent mechanical properties and chemical stability of polymer materials and good electrical conductivity of metal materials. The room-temperature electrical conductivity can vary within the range of insulator-semiconductor-metal state, and it has great application potential in fields such as power infrastructure, electromagnetic shielding, electronic devices such as transistors, and new energy. So far, the research on conductive polymers has a history of more than 30 years, and great progress has been made in aspects such as the mechanism, design and synthesis of materials, structure and properties, processability and stability, and application exploration in technology. Intrinsically conductive polymers such as polyacetylene, polypyrrole, polyaniline, and polythiophene have been developed and are moving towards practical applications. However, conductive polymers have problems such as high price, poor processability, and poor stability, which have been somewhat restricted in practical applications.

[0004] Polyaniline has good electrical conductivity, stable structure, and simple preparation. It can be used as a conductive filler to be compounded with non-conductive polymers to prepare conductive composite polymers. Scholars have carried out a large number of studies on adjusting the electrical conductivity and mechanical properties of composite materials by the addition amount of conductive fillers.

[0005] However, polyaniline is extremely difficult to dissolve, easily agglomerates, and is not easily dispersed in the matrix material, which is not conducive to optimizing the electrical conductivity and mechanical properties of conductive composite polymers, and has formed a greater obstacle to its development. Summary of the Invention

[0006] In order to improve the mechanical properties of conductive composite polymers, this application provides a nano-modified polyaniline composite material for a power earthing body and its preparation process.

[0007] In the first aspect, a nano-modified polyaniline composite material for a power earthing body provided by this application adopts the following technical solution:

[0008] A nano-modified polyaniline composite material for a power grounding body, comprising a nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer, and an additive. The weight ratio of the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer, and additive is (4-5):(10-11):(3-4):(1-2).

[0009] By adopting the above technical solution, after the polyaniline material is nano-modified, it is then mixed with low-density polyethylene, styrene-butadiene thermoplastic elastomer, and an additive to obtain a composite material. In this process, the dispersion uniformity of the polyaniline material in the composite material is improved, thereby effectively improving the mechanical properties of the composite material, so that the finally prepared conductive composite polymer can be applicable to a variety of environments.

[0010] Preferably, the additive includes a coupling agent, an anti-aging agent, and a flame retardant. The weight ratio of the coupling agent, anti-aging agent, and flame retardant is 2:2:3.

[0011] By adopting the above technical solution, using a coupling agent, an anti-aging agent, and a flame retardant as additives, the physical properties of the finally prepared conductive composite polymer are further improved, and the applicability of the conductive composite polymer in a variety of environments is enhanced.

[0012] Preferably, the nano-modified polyaniline material is prepared by the following steps:

[0013] S1. Ultrasonically disperse 1 wt% halloysite powder in an aqueous solution, and then add a dopant to form a first-step solution with a concentration of 0.1 mol / L - 0.5 mol / L.

[0014] S2. Dissolve 0.5 wt% - 5 wt% of aniline monomer in the first-step solution according to the weight ratio to the halloysite powder to form a second-step solution, and control the temperature of the obtained second-step solution at 0 - 4 °C.

[0015] S3. Add 1 wt% - 2 wt% of an oxidant to the above second-step solution according to the weight ratio of the oxidant to the aniline monomer, control the temperature at 0 - 4 °C, stir and react for 6 - 8 h, centrifuge and wash three times with ethanol and deionized water respectively, and freeze-dry to obtain the nano-modified polyaniline material.

[0016] By adopting the above technical solution, nano-modification of polyaniline with halloysite was carried out to prepare a core-shell structured nano-composite material with halloysite as the core and polyaniline as the shell. Halloysite has excellent dispersibility and loading capacity. Its large surface area can provide more electrochemically active sites, and the hollow tubular structure can promote ion diffusion. Polyaniline is functionalized on the surface of halloysite, which can prevent the aggregation of polyaniline, thereby improving the dispersibility and conductivity of polyaniline. Halloysite itself has good mechanical strength and can play a role in nano-crosslinking. Through physical interaction forces such as hydrogen bonds with the polymer matrix, the mechanical properties of the composite material are optimized.

[0017] Preferably, the dopant is hydrochloric acid or perchloric acid.

[0018] Preferably, the oxidant is ammonium persulfate.

[0019] Preferably, it further includes a reinforcing filler and a modified fiber, and the weight ratio of the nano-modified polyaniline material, the reinforcing filler and the modified fiber is 11:2:2.

[0020] By adopting the above technical solution, during the preparation process of the conductive composite polymer, the reinforcing filler and the modified fiber are uniformly dispersed with the nano-modified polyaniline material along with stirring, and the three play a role of mutual filling, thereby improving the mechanical properties of the conductive composite polymer.

[0021] Preferably, the reinforcing filler is zirconium hydrogen phosphate modified with silica.

[0022] By adopting the above technical solution, on the one hand, the elongation at break and breaking strength of the conductive composite polymer are improved, making the conductive composite polymer not easily damaged, and on the other hand, the conductivity of the conductive composite polymer is enhanced.

[0023] Preferably, the modified fiber is lignocellulose modified with silica.

[0024] By adopting the above technical solution, during the mixing process, lignocellulose modified with silica enhances the toughness of the conductive composite polymer and improves its conductivity.

[0025] Secondly, a preparation process of a nano-modified polyaniline composite material for a power earthing body provided by the present application adopts the following technical solution:

[0026] A preparation process of a nano-modified polyaniline composite material for a power earthing body includes the following steps:

[0027] S1. According to the weight ratio, uniformly mix the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer, and additive in a high-speed mixer, and then add them to a torque rheometer for kneading for 3 - 5 min. Meanwhile, control the temperature at 145 °C and set the rotation speed at 50 - 70 rpm;

[0028] S2. Place the material obtained from the first-step kneading above into a rectangular mold, and then put it into a flat vulcanizer for compression molding. Control the temperature at 145 °C, set the molding time to 3 min, and cool to obtain the nano-modified polyaniline composite material.

[0029] Preferably, it includes the following steps:

[0030] S1. According to the weight ratio, uniformly mix the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer, additive, reinforcing filler, and modified fiber in a high-speed mixer, and then add them to a torque rheometer for kneading for 3 - 5 min. Meanwhile, control the temperature at 145 °C and set the rotation speed at 50 - 70 rpm;

[0031] S2. Place the material obtained from the first-step kneading above into a rectangular mold, and then put it into a flat vulcanizer for compression molding. Control the temperature at 145 °C, set the molding time to 3 min, and cool to obtain the nano-modified polyaniline composite material.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. Using halloysite to nano-modify polyaniline, a core-shell structure nano-composite material with halloysite as the core and polyaniline as the shell is prepared. Halloysite has excellent dispersibility and loading capacity. Its large surface area can provide more electrochemically active sites, and its hollow tubular structure can promote ion diffusion. Polyaniline is functionalized on the surface of halloysite, which can prevent the aggregation of polyaniline, thereby improving the dispersibility and conductivity of polyaniline; Halloysite itself has good mechanical strength and can play a role in nano-crosslinking. Through physical interactions such as hydrogen bonds with the polymer matrix, the mechanical properties of the composite material are optimized;

[0034] 2. After nano-modifying the polyaniline material, it is then mixed with low-density polyethylene, styrene-butadiene thermoplastic elastomer, and additive to prepare a composite material. In this process, the dispersibility of the polyaniline material in the composite material is improved, thereby effectively enhancing the mechanical properties of the composite material, making the finally prepared conductive composite polymer applicable to various environments;

[0035] 3. During the preparation of the conductive composite polymer, the reinforcing filler and the modified fiber are uniformly dispersed with the nano-modified polyaniline material during stirring, and the three play a role of mutual filling, thereby improving the mechanical properties of the conductive composite polymer. Detailed implementation manners

[0036] The present application will be further described in detail below with reference to examples and comparative examples.

[0037] In the present application, the coupling agent is KH560, the anti-aging agent is BASF 1010, the flame retardant is antimony trioxide flame retardant, the particle size of halloysite is 50 nm, the length of lignin fiber is 3 mm, the diameter is 15 μm, the particle size of silicon dioxide powder is 100 nm, and other raw materials are all purchased commercially.

[0038] Preparation examples of nano-modified polyaniline materials

[0039] Preparation example 1

[0040] S1. Ultrasonically disperse halloysite powder in water for 30 min to prepare a 1 wt% halloysite aqueous dispersion, and then add the dopant hydrochloric acid to this dispersion to form a first-step solution with a hydrochloric acid concentration of 0.1 mol / L.

[0041] S2. According to mass parts, take 100 parts of the above first-step solution, add 3 parts of aniline monomer, and stir for 30 min to form a second-step solution.

[0042] S3. Add 1.3 parts of the oxidant ammonium persulfate to the obtained second-step solution, control the temperature at 0 - 4 °C, stir for 6 h to obtain a light green suspension, centrifuge the product at a speed of 8000 rpm using a centrifuge, and wash it three times with ethanol and deionized water respectively, and freeze-dry for 12 h to obtain the nano-modified polyaniline material.

[0043] The conductivity of the nano-modified polyaniline material is measured to be 5.2 S / m.

[0044] Preparation example 2

[0045] S1. Ultrasonically disperse halloysite powder in water for 30 min to prepare a 1 wt% halloysite aqueous dispersion, and then add the dopant hydrochloric acid to this dispersion to form a first-step solution with a hydrochloric acid concentration of 0.1 mol / L.

[0046] S2. According to mass parts, take 100 parts of the above first-step solution, add 5 parts of aniline monomer, and stir for 30 min to form a second-step solution.

[0047] S3. Add 1.3 parts of ammonium persulfate as the oxidant to the obtained second-step solution, control the temperature at 0 - 4 °C, stir for 6 h to obtain a light green suspension, centrifuge the product at a speed of 8000 rpm using a centrifuge, wash it three times with ethanol and deionized water respectively, and freeze-dry for 12 h to obtain the nano-modified polyaniline material.

[0048] The conductivity of the nano-modified polyaniline material was measured to be 5.7 S / m.

[0049] Preparation Example 3

[0050] S1. Ultrasonically disperse halloysite powder in water for 30 min to prepare a 1 wt% halloysite aqueous dispersion, and then add the dopant perchloric acid to this dispersion to form a first-step solution with a perchloric acid concentration of 0.1 mol / L.

[0051] S2. According to mass parts, take 100 parts of the above first-step solution, add 5 parts of aniline monomer, and stir for 30 min to form a second-step solution.

[0052] S3. Add 1.3 parts of ammonium persulfate as the oxidant to the obtained second-step solution, control the temperature at 0 - 4 °C, stir for 6 h to obtain a light green suspension, centrifuge the product at a speed of 8000 rpm using a centrifuge, wash it three times with ethanol and deionized water respectively, and freeze-dry for 12 h to obtain the nano-modified polyaniline material.

[0053] The conductivity of the nano-modified polyaniline material was measured to be 5.1 S / m.

[0054] It can be known from the comparison of Preparation Examples 1 - 3 that the ratio between halloysite and aniline monomer has an obvious effect on the conductivity of the final nano-modified polyaniline material, and using hydrochloric acid as the dopant is significantly better than perchloric acid.

[0055] Preparation Example of Modified Zirconium Hydrogen Phosphate

[0056] Preparation Example 4

[0057] S1. Mix 1 g of zirconium hydrogen phosphate with 50 mL of n-butylamine solution with a concentration of 0.2 mol / L, add 1 g of silica powder and stir to mix for 12 h, adjust the pH = 2 using a 0.2 mol / L hydrochloric acid solution, and control the rotation speed at 500 rpm;

[0058] S2. Filter the solid and wash it multiple times with petroleum ether, and vacuum dry to constant weight.

[0059] By intercalating zirconium hydrogen phosphate with n-butylamine and simultaneously loading silica onto zirconium hydrogen phosphate, the dispersion performance of zirconium hydrogen phosphate is utilized to make the nano-modified polyaniline material more uniformly dispersed. At the same time, silica is used to enhance the bonding strength between zirconium hydrogen phosphate and low-density polyethylene, etc., and simultaneously improve the electrical conductivity of the final polymer.

[0060] Preparation example of modified lignin fiber

[0061] Preparation example 5

[0062] S1. Mix lignin fiber with 1% NaOH solution by mass. The NaOH solution covers the lignin fiber. The reaction temperature is 30 °C and the reaction time is 2 h. After the reaction, wash with deionized water until the pH of the filtrate is neutral.

[0063] S2. Take 5 g of the lignin fiber treated in S1, place it in 50 mL of ethanol, add 3 g of silica powder, ultrasonicate for 10 min, filter by suction, and then dry in vacuum at 80 °C for 6 h to complete the modification.

[0064] By using silica to modify lignin fiber, when the bonding strength between lignin fiber and low-density polyethylene, etc. increases, the interfacial compatibility with the nano-modified polyaniline material and modified zirconium hydrogen phosphate is improved, so that the nano-modified polyaniline material and zirconium hydrogen phosphate are uniformly dispersed in low-density polyethylene, realizing the enhancement of the toughness of low-density polyethylene.

[0065] Example 1

[0066] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0067] Counted by weight parts.

[0068] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation example 1, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 min.

[0069] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 min. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0070] Example 2

[0071] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0072] Counted by weight parts.

[0073] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation Example 2, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 min.

[0074] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for compression molding. Control the temperature at 145 °C, and set the molding time to 3 min. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0075] Example 3

[0076] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0077] By weight parts.

[0078] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation Example 3, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 min.

[0079] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for compression molding. Control the temperature at 145 °C, and set the molding time to 3 min. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0080] Example 4

[0081] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0082] By weight parts.

[0083] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation Example 2, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 min.

[0084] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for compression molding. Control the temperature at 145 °C, and set the molding time to 3 min. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0085] Example 5

[0086] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0087] Counted by weight parts.

[0088] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation Example 2, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 minutes.

[0089] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 minutes. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0090] Example 6

[0091] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0092] Counted by weight parts.

[0093] S1. Mix 22 parts of the nano-modified polyaniline material prepared in Preparation Example 2, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, 3 parts of flame retardant, [parts] of the modified zirconium hydrogen phosphate prepared in Preparation Example 4, and [parts] of the modified lignin fiber prepared in Preparation Example 5 evenly in a high-speed mixer, and then add them to a torque rheometer. Control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 minutes.

[0094] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 minutes. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0095] Comparative Example 1

[0096] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0097] Counted by weight parts.

[0098] S1. Mix 10 parts of the nano-modified polyaniline material prepared in Preparation Example 1, 70 parts of low-density polyethylene, 12 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 3 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer. Then add them to a torque rheometer, control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 minutes.

[0099] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 minutes. Cool to obtain the nano-modified polyaniline composite conductive polymer material.

[0100] Comparative Example 2

[0101] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0102] Counted by weight parts.

[0103] S1. Mix 30 parts of the nano-modified polyaniline material prepared in Preparation Example 3, 50 parts of low-density polyethylene, 13 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer. Then add them to a torque rheometer, control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 minutes.

[0104] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 minutes. Cool to obtain the nano-modified polyaniline composite conductive polymer.

[0105] Comparative Example 3

[0106] A nano-modified polyaniline composite conductive polymer material is prepared by the following steps:

[0107] Counted by weight parts.

[0108] S1. Mix 22 parts of commercially available conductive polyaniline, 53 parts of low-density polyethylene, 18 parts of styrene-butadiene thermoplastic elastomer, 2 parts of coupling agent, 2 parts of anti-aging agent, and 3 parts of flame retardant evenly in a high-speed mixer. Then add them to a torque rheometer, control the temperature at 145 °C, set the rotation speed at 50 - 70 rpm, and knead for 5 minutes.

[0109] S2. Place the kneaded material in a rectangular mold, and then put it into a flat vulcanizer for molding. Control the temperature at 145 °C and set the molding time to 3 minutes. Cool to obtain the nano-modified polyaniline composite conductive polymer.

[0110] Table 1 Performance Data Test Table of Examples and Comparative Examples

[0111]

[0112] By comparing Example 2 with Comparative Example 3, halloysite was used to conduct nano-modification on polyaniline, and a core-shell structure nanocomposite with halloysite as the core and polyaniline as the shell was prepared. Halloysite has excellent dispersibility and loading capacity. Its large surface area can provide more electrochemically active sites, and the hollow tubular structure can promote ion diffusion. Polyaniline is functionalized on the surface of halloysite, which can prevent the aggregation of polyaniline, thereby improving the dispersibility and conductivity of polyaniline; halloysite itself has good mechanical strength and can play a role in nano-crosslinking. Through physical interactions such as hydrogen bonds with the polymer matrix, the mechanical properties of the composite material are optimized.

[0113] By comparing Example 2, Comparative Example 1 and Comparative Example 2, by adjusting the addition ratio of the nano-modified polyaniline material, it can have an obvious impact on the conductivity and mechanical properties of the final conductive composite polymer.

[0114] By comparing Example 2 with Examples 4-6, zirconium hydrogen phosphate was intercalated with n-butylamine, and at the same time, silica was loaded on zirconium hydrogen phosphate. By borrowing the dispersibility of zirconium hydrogen phosphate, the nano-modified polyaniline material was more uniformly dispersed. At the same time, due to silica, the binding strength between zirconium hydrogen phosphate and low-density polyethylene was enhanced, and the conductivity of the final polymer was improved simultaneously.

[0115] By using silica to modify lignin fibers, when the binding strength between lignin fibers and low-density polyethylene and other materials increases, the interfacial compatibility with the nano-modified polyaniline material and modified zirconium hydrogen phosphate is improved. Thus, with the uniform dispersion of the nano-modified polyaniline material and zirconium hydrogen phosphate in low-density polyethylene, the toughness of low-density polyethylene is enhanced.

[0116] The above are all preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A nano-modified polyaniline composite material for electric power grounding body, characterized in that: It comprises nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer and additives, wherein the weight ratio of the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer and additives is (4-5):(10-11):(3-4):(1-2); The additives include a coupling agent, an anti-aging agent and a flame retardant, and the weight ratio of the coupling agent, the anti-aging agent and the flame retardant is 2:2:3; It also includes reinforcing fillers and modified fibers, wherein the weight ratio of the nano-modified polyaniline material, the reinforcing fillers and the modified fibers is 11:2:2; The reinforcing filler is silicon dioxide modified zirconium hydrogen phosphate; The modified fiber is silicon dioxide modified wood cellulose; The nano-modified polyaniline material is prepared by the following steps: S1, ultrasonically dispersing 1 wt% of halloysite powder in water, and then adding a dopant to form a first step solution with a concentration of 0.1 mol / L-0.5 mol / L; S2, according to the weight ratio of aniline monomer to halloysite powder, dissolving 0.5wt%-5wt% of aniline monomer in the first step solution to form a second step solution, and controlling the temperature of the obtained second step solution to be 0-4°C; S3. According to the weight ratio of the oxidant to the aniline monomer, 1wt%-2wt% of the oxidant is added to the above second step solution, the temperature is controlled at 0-4°C, the reaction is stirred for 6-8h, centrifuged and washed three times with ethanol and deionized water respectively, and freeze-dried to obtain a nano-modified polyaniline material.

2. The nano-modified polyaniline composite material for electric power grounding body according to claim 1, characterized in that: The doping agent is hydrochloric acid.

3. The nano-modified polyaniline composite material for electric power grounding body according to claim 1, characterized in that: The oxidant is ammonium persulfate.

4. The method for preparing a nano-modified polyaniline composite material for electric power grounding body according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. According to the weight ratio, the nano-modified polyaniline material, low-density polyethylene, styrene-butadiene thermoplastic elastomer, additive reinforcing filler and modified fiber are mixed evenly in a high-speed mixer, and then added into a torque rheometer for kneading for 3-5 minutes. At the same time, the temperature is controlled at 145°C and the speed is set at 50-70rpm; S2. The material obtained by mixing in S1 is placed in a rectangular mold, and then placed in a flat vulcanizer for compression molding. The temperature is controlled at 145° C., the molding time is set to 3 min, and the material is cooled to obtain a nano-modified polyaniline composite material.

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