Multiphase composite conductive polymer material and preparation method thereof

Abstract

The invention belongs to the technical field of conductive polymer materials, and particularly provides a multiphase composite conductive polymer material and a preparation method thereof. The multiphase composite conductive polymer material comprises the following components in parts by weight: 25-40 parts of polythiophene; 20 to 35 parts of polyurethane; 10-20 parts of a conductive polymer microtube; 10 to 15 parts of a two-dimensional nano conductive filler; 3-5 parts of a lubricant; 1-3 parts of a coupling agent; 2-5 parts of a flame retardant; 1-3 parts of an anti-aging agent; 1.5 to 2.5 parts of an antioxidant; the conductive polymer microtubule is prepared from a cellulose microtubule, a monomer and a protein thiolated derivative, the protein thiolated derivative is prepared from zein and thioacetic acid. The multiphase composite conductive polymer material prepared by the invention has the advantages of good conductivity and corrosion resistance.

Description

Technical Field

[0001] This application belongs to the field of conductive polymer materials technology, and in particular relates to a multiphase composite conductive polymer material and its preparation method. Background Technology

[0002] In power systems, grounding devices are the foundation for safe operation and a crucial component, with their working condition affecting the safe and stable operation of transmission and transformation facilities. As power grids develop towards higher voltage levels and larger transmission capacities, the requirements for the safe and stable operation of transmission and transformation equipment are becoming increasingly stringent, highlighting the growing importance of grounding devices.

[0003] Currently, grounding materials are mainly metallic, and corrosion in soil is unavoidable. For example, research data shows that galvanized steel materials remain intact in soil for no more than 6 years. Furthermore, the accelerated corrosion caused by electromagnetic induction currents within the power transmission and transformation system itself and external interference currents leads to a reduction in the cross-sectional area of ​​the grounding grid conductors and down conductors, making them unable to withstand short-circuit currents and causing breakage. This poses a potential threat to primary and secondary equipment and personnel, resulting in serious losses. The development of power systems places increasingly higher demands on the corrosion resistance of grounding materials. Currently, metallic grounding materials, primarily galvanized steel, cannot meet the requirements for full-life-cycle service. Therefore, effectively solving the corrosion problem of grounding materials is a necessary condition for ensuring the stability and reliability of the grounding system.

[0004] In response, engineers have developed several non-metallic grounding materials, such as conductive coatings, flexible graphite, and organic grounding materials. However, these materials suffer from drawbacks in practical applications, including poor power frequency withstand capability, poor longitudinal long-range drainage performance, and poor temperature and corrosion resistance. Furthermore, for organic grounding materials, the outer organic layer has poor impermeability to corrosive media, leading to internal metal corrosion. These shortcomings limit the application of non-metallic grounding materials; therefore, developing highly conductive and corrosion-resistant polymer grounding materials is of significant technical importance. Summary of the Invention

[0005] To address the above problems, this application provides a multiphase composite conductive polymer material and its preparation method.

[0006] This application first provides a multiphase composite conductive polymer material, comprising the following components in parts by weight: Polythiophene 25-40 parts; polyurethane 20-35 parts; conductive polymer microtubes 10-20 parts; two-dimensional nano-conductive filler 10-15 parts; lubricant 3-5 parts; coupling agent 1-3 parts; flame retardant 2-5 parts; antioxidant 1-3 parts; antioxidant 1.5-2.5 parts; The conductive polymer microtubules are prepared from cellulose microtubules, monomers, and protein thiolation derivatives. The protein thiolation derivative was prepared from zein and thioacetic acid.

[0007] Furthermore, the method for preparing the conductive polymer microtubes includes the following steps: 1) Disperse cellulose microtubules and protein thiolation derivatives in a solvent, then add monomers and stir thoroughly to obtain a dispersion; 2) Add the initiator dropwise to the dispersion, react in an ice bath, centrifuge, wash the resulting precipitate with deionized water, and dry it under vacuum.

[0008] Furthermore, the mass ratio of the cellulose microtubules to the protein thiolation derivative is 1:(0.1-0.2).

[0009] Furthermore, the monomer is thiophene.

[0010] Furthermore, the preparation method of the protein thiolation derivative includes the following steps: dissolving zein in an ethanol solution, adding thioacetic acid, stirring overnight at room temperature, then precipitating, centrifuging, and drying to obtain the product.

[0011] Furthermore, the mass ratio of zein to thioacetic acid is 1:(0.5-0.65).

[0012] Furthermore, the two-dimensional nano-conductive filler is Ti3C2T. X One of MXene, graphene, and fullerene.

[0013] Furthermore, the lubricant is one of molybdenum disulfide, graphite, and tungsten disulfide; And / or, the coupling agent is an aluminate coupling agent; And / or, the flame retardant is one of DOPO, halogen-free flame retardant, and melamine.

[0014] This application provides a method for preparing a multiphase composite conductive polymer material, comprising the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, core-shell nano-conductive fillers, two-dimensional nano-conductive fillers, lubricant, coupling agent, flame retardant, antioxidant, and granulation to obtain the material.

[0015] Furthermore, the extrusion temperature is 130-185°C.

[0016] This application also provides a grounding electrode, including a metal core and a conductive layer covering the surface of the metal core, wherein the conductive layer is extruded from the above-mentioned multiphase composite conductive polymer material; And / or, the conductive layer is formed by spraying and curing a powder coating made of the above-mentioned multiphase composite conductive polymer material.

[0017] The metal core is one of copper, aluminum, or an alloy.

[0018] Compared with the prior art, this application has the following beneficial effects: This application introduces conductive polymer microtubes and two-dimensional nano-conductive fillers into a polythiophene and polyurethane system, constructing a multi-layer conductive network structure within the system. This improves conductivity, current dissipation, and corrosion resistance, while also exhibiting good mechanical properties. The conductive polymer microtubes, modified with protein thiol derivatives, inhibit interfacial delamination, reduce the penetration of corrosive media from the soil into the system, and provide excellent passivation protection for the metal core. Furthermore, the conductive polymer microtubes improve the dispersion uniformity of the two-dimensional nano-conductive filler, further enhancing the conductive anisotropy of the composite material. The grounding electrode of this application exhibits excellent drainage performance, enabling rapid long-distance transmission of current through the metal core. Protected by the multiphase composite conductive polymer material, it possesses a very long service life, making it suitable for various complex geological and soil environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the open-circuit potential data of the conductive polymer materials in simulated soil solution for Examples 1-2 and Control Groups 1-2 of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0023] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0024] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0025] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0026] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0027] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0028] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0029] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0030] Based on extensive experimental research, this application provides a multiphase composite conductive polymer material comprising the following components in parts by weight: Polythiophene 25-40 parts; polyurethane 20-35 parts; conductive polymer microtubes 10-20 parts; two-dimensional nano-conductive filler 10-15 parts; lubricant 3-5 parts; coupling agent 1-3 parts; flame retardant 2-5 parts; antioxidant 1-3 parts; antioxidant 1.5-2.5 parts; The conductive polymer microtubules are prepared from cellulose microtubules, monomers, and protein thiolation derivatives. The protein thiolation derivative was prepared from zein and thioacetic acid.

[0031] In some specific embodiments, the multiphase composite conductive polymer material comprises the following components in parts by weight: The mixture consists of 35 parts polythiophene, 20 parts polyurethane, 15 parts conductive polymer microtubes, 15 parts two-dimensional nano-conductive filler, 3 parts lubricant, 2 parts coupling agent, 3.5 parts flame retardant, 2 parts antioxidant, and 2 parts antioxidant. This combination yields optimal technical results.

[0032] Furthermore, the method for preparing the conductive polymer microtubes includes the following steps: 1) Disperse cellulose microtubules and protein thiolation derivatives in a solvent, then add monomers and stir thoroughly to obtain a dispersion; 2) Add the initiator dropwise to the dispersion, react in an ice bath, centrifuge, wash the resulting precipitate with deionized water, and dry it under vacuum.

[0033] Furthermore, the mass ratio of the cellulose microtubules to the protein thiolation derivative is 1:(0.1-0.2).

[0034] In some specific embodiments, the mass ratio of cellulose microtubules to protein thiol derivatives can be 1:0.1, 1:0.11, 1:0.12, 1:0.13, 1:0.14, 1:0.15, 1:0.16, 1:0.17, 1:0.18, 1:0.19, or 1:0.2. Generally, a mass ratio of cellulose microtubules to protein thiol derivatives of 1:0.15 yields the best technical results.

[0035] In some specific embodiments, the preparation method of the cellulose microtubules includes the following steps: pulverizing wood pulp to 100 mesh, first removing lignin with 5wt% NaOH solution, then hydrolyzing with 10wt% H2SO4 at 45℃ for 2h, followed by centrifugation at 10000 rpm, washing the obtained centrifuged material with deionized water, and freeze-drying to obtain the cellulose microtubules with a diameter of 5-10 μm, a length of 100-500 μm, and an aspect ratio >50.

[0036] Furthermore, the monomer is thiophene.

[0037] Furthermore, the preparation method of the protein thiolation derivative includes the following steps: dissolving zein in an ethanol solution, adding thioacetic acid, stirring overnight at room temperature, then precipitating, centrifuging, and drying to obtain the product.

[0038] Furthermore, the mass ratio of zein to thioacetic acid is 1:(0.5-0.65).

[0039] In some specific embodiments, the mass ratio of zein to thioacetic acid can be 1:0.5, 1:0.51, 1:0.52, 1:0.53, 1:0.54, 1:0.55, 1:0.56, 1:0.57, 1:0.58, 1:0.59, 1:0.60, 1:0.61, 1:0.62, 1:0.63, 1:0.64, or 1:0.65. Generally, a mass ratio of zein to thioacetic acid of 1:0.55 yields the best technical results.

[0040] Furthermore, the two-dimensional nano-conductive filler is Ti3C2T. X One of MXene, graphene, and fullerene.

[0041] In some specific embodiments, fullerene is selected as the two-dimensional nano-conductive filler, which yields better results.

[0042] Furthermore, the lubricant is one of molybdenum disulfide, graphite, and tungsten disulfide; In some specific embodiments, molybdenum disulfide is selected as the lubricant, which yields better results.

[0043] And / or, the coupling agent is an aluminate coupling agent; And / or, the flame retardant is one of DOPO, halogen-free flame retardant, and melamine.

[0044] In some specific embodiments, the flame retardant is better when DOPO is selected.

[0045] This application provides a method for preparing a multiphase composite conductive polymer material, comprising the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, two-dimensional nano-conductive fillers, lubricant, coupling agent, flame retardant, antioxidant, and granulation to obtain the material.

[0046] Furthermore, the extrusion temperature is 130-185°C.

[0047] This application also provides a grounding electrode, including a metal core and a conductive layer covering the surface of the metal core, wherein the conductive layer is extruded from the above-mentioned multiphase composite conductive polymer material; And / or, the conductive layer is formed by spraying and curing a powder coating made of the above-mentioned multiphase composite conductive polymer material.

[0048] The metal core is one of copper, aluminum, or an alloy.

[0049] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0050] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0051] Example 1 The multiphase composite conductive polymer material of this embodiment includes the following components by weight: 35kg of polythiophene; 20kg of polyurethane; 15kg of conductive polymer microtubes; 15kg of two-dimensional nano-conductive filler; 3kg of lubricant; 2kg of coupling agent; 3.5kg of flame retardant; 2kg of antioxidant; 2kg of antioxidant.

[0052] The polythiophene is designated PTB7. The polyurethane is designated BASF 685A. The two-dimensional conductive nanofiller is fullerene. The lubricant is molybdenum disulfide. The coupling agent is an aluminate coupling agent. The flame retardant is DOPO. The antioxidant is N-phenyl-α-aniline. The antioxidant is β-naphthylflavonoid.

[0053] The method for preparing conductive polymer microtubes in this embodiment includes the following steps: 1) Disperse 5g of cellulose microtubes, 0.5g of protein thiolation derivatives and 2g of sodium polystyrene sulfonate in deionized water, stir thoroughly at room temperature for 30min, then filter and transfer to 50ml of LDMF, disperse thoroughly and evenly, then add 5g of 3,4-ethylenedioxythiophene, and stir magnetically in an ice bath for 2h to obtain a dispersion. 2) Add DMF solution containing 16.2g of anhydrous ferric chloride dropwise to the dispersion. After the addition is complete, react in an ice bath for 6 hours, then centrifuge. Disperse the resulting precipitate in 200mL of a 20% tetrabutylammonium hydroxide / DMSO mixed solution (volume ratio of tetrabutylammonium hydroxide to DMSO: 2:8). Stir at room temperature for 2 hours to remove the cellulose template. Finally, filter out the precipitate, wash with deionized water, and vacuum dry to obtain the final product.

[0054] The preparation method of the protein thiol derivative in this embodiment includes the following steps: 10g of zein is dissolved in 150mL of 65% ethanol solution, and the pH is adjusted to 6 to obtain a zein solution; 5.5g of thioacetic acid is dissolved in anhydrous ethanol, and 1.5g of EDC is added and mixed evenly. The mixture is activated in an ice bath for 30min to obtain a thioacetic acid mixed solution; then the activated thioacetic acid mixed solution is added dropwise to the zein solution, and the mixture is stirred at room temperature for 5h. Then, the mixture is dialyzed, precipitated, centrifuged, and dried to obtain the final product.

[0055] The preparation method of the multiphase composite conductive polymer material in this embodiment includes the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, two-dimensional nano-conductive fillers, lubricant, coupling agent, flame retardant, anti-aging agent and antioxidant, and then granulating them by twin-screw extrusion.

[0056] The specific process of twin-screw extrusion is as follows: conveying zone: 130-150℃, melting zone: 160-175℃, mixing zone: 175-180℃, venting zone: 170-175℃, homogenizing zone: 170-175℃, and die head zone: 170-185℃.

[0057] Example 2 The multiphase composite conductive polymer material of this embodiment includes the following components by weight: 35kg of polythiophene; 20kg of polyurethane; 15kg of conductive polymer microtubes; 15kg of two-dimensional nano-conductive filler; 3kg of lubricant; 2kg of coupling agent; 3.5kg of flame retardant; 2kg of antioxidant; 2kg of antioxidant.

[0058] The polythiophene is designated PTB7. The polyurethane is designated BASF 685A. The two-dimensional conductive nanofiller is fullerene. The lubricant is molybdenum disulfide. The coupling agent is an aluminate coupling agent. The flame retardant is DOPO. The antioxidant is N-phenyl-α-aniline. The antioxidant is β-naphthylflavonoid.

[0059] The method for preparing conductive polymer microtubes in this embodiment includes the following steps: 1) Disperse 5g of cellulose microtubes, 0.5g of protein thiolation derivatives and 2g of sodium polystyrene sulfonate in deionized water, stir thoroughly at room temperature for 30min, then filter and transfer to 50ml of LDMF, disperse thoroughly and evenly, then add 5g of 3,4-ethylenedioxythiophene, and stir magnetically in an ice bath for 2h to obtain a dispersion. 2) Add DMF solution containing 16.2g of anhydrous ferric chloride dropwise to the dispersion. After the addition is complete, react in an ice bath for 6 hours, then centrifuge. Disperse the resulting precipitate in 200mL of a 20% tetrabutylammonium hydroxide / DMSO mixed solution (volume ratio of tetrabutylammonium hydroxide to DMSO: 2:8). Stir at room temperature for 2 hours, remove the cellulose template, filter out the precipitate, wash with deionized water, and vacuum dry to obtain the final product.

[0060] The preparation method of the protein thiol derivative in this embodiment includes the following steps: 10g of zein is dissolved in 150mL of 65% ethanol solution, and the pH is adjusted to 6 to obtain a zein solution; 5.5g of thioacetic acid is dissolved in anhydrous ethanol, and 1.5g of EDC is added and mixed evenly. The mixture is activated in an ice bath for 30min to obtain a thioacetic acid mixed solution; then the activated thioacetic acid mixed solution is added dropwise to the zein solution, and the mixture is stirred at room temperature for 5h. Then, the mixture is dialyzed, precipitated, centrifuged, and dried to obtain the final product.

[0061] The preparation method of the multiphase composite conductive polymer material in this embodiment includes the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, two-dimensional nano-conductive fillers, lubricant, coupling agent, flame retardant, anti-aging agent and antioxidant, and then granulating them by twin-screw extrusion.

[0062] The specific process of twin-screw extrusion is as follows: conveying zone: 130-150℃, melting zone: 160-175℃, mixing zone: 175-180℃, venting zone: 170-175℃, homogenizing zone: 170-175℃, and die head zone: 170-185℃.

[0063] Control group 1 The conductive polymer material in this control group comprises the following components by weight: 50 kg of polythiophene; 20 kg of polyurethane; 15 kg of two-dimensional nano-conductive filler; 3 kg of lubricant; 2 kg of coupling agent; 3.5 kg of flame retardant; 2 kg of antioxidant; 2 kg of antioxidant.

[0064] The polythiophene is designated PTB7. The polyurethane is designated BASF 685A. The two-dimensional conductive nanofiller is fullerene. The lubricant is molybdenum disulfide. The coupling agent is an aluminate coupling agent. The flame retardant is DOPO. The antioxidant is N-phenyl-α-aniline. The antioxidant is β-naphthylflavonoid.

[0065] The preparation method of the conductive polymer material in this control group includes the following steps: mixing polythiophene, polyurethane, two-dimensional nano-conductive filler, lubricant, coupling agent, flame retardant, anti-aging agent and antioxidant, and then granulating them by twin-screw extrusion.

[0066] The specific process of twin-screw extrusion is as follows: conveying zone: 130-150℃, melting zone: 160-175℃, mixing zone: 175-180℃, venting zone: 170-175℃, homogenizing zone: 170-175℃, and die head zone: 170-185℃.

[0067] Control group 2 The conductive polymer material in this control group comprises the following components by weight: 35kg of polythiophene; 20kg of polyurethane; 15kg of conductive polymer microtubes; 15kg of two-dimensional nano-conductive filler; 3kg of lubricant; 2kg of coupling agent; 3.5kg of flame retardant; 2kg of antioxidant; 2kg of antioxidant.

[0068] The polythiophene is designated PTB7. The polyurethane is designated BASF 685A. The two-dimensional conductive nanofiller is fullerene. The lubricant is molybdenum disulfide. The coupling agent is an aluminate coupling agent. The flame retardant is DOPO. The antioxidant is N-phenyl-α-aniline. The antioxidant is β-naphthylflavonoid.

[0069] The preparation method of the conductive polymer microtubes in this control group includes the following steps: 1) Disperse 5g of cellulose microtubes and 2g of sodium polystyrene sulfonate in deionized water, stir thoroughly at room temperature for 30min, then filter and transfer to 50ml of LDM, disperse thoroughly and evenly, then add 5g of 3,4-ethylenedioxythiophene, and stir magnetically in an ice bath for 2h to obtain a dispersion. 2) Add DMF solution containing 16.2g of anhydrous ferric chloride dropwise to the dispersion. After the addition is complete, react in an ice bath for 6 hours, then centrifuge. Disperse the resulting precipitate in 200mL of a 20% tetrabutylammonium hydroxide / DMSO mixed solution (volume ratio of tetrabutylammonium hydroxide to DMSO: 2:8). Stir at room temperature for 2 hours, remove the cellulose template, filter out the precipitate, wash with deionized water, and vacuum dry to obtain the final product.

[0070] The preparation method of the conductive polymer material in this control group includes the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, two-dimensional nano-conductive fillers, lubricant, coupling agent, flame retardant, antioxidant, and antioxidant, and then granulating them by twin-screw extrusion.

[0071] The specific process of twin-screw extrusion is as follows: conveying zone: 130-150℃, melting zone: 160-175℃, mixing zone: 175-180℃, venting zone: 170-175℃, homogenizing zone: 170-175℃, and die head zone: 170-185℃.

[0072] Performance testing 1. Take the conductive polymer materials from Examples 1-2 and Control Groups 1-2, and test their volume resistivity, tensile strength and elongation at break according to HT001-2022; conduct impulse current withstand test, power frequency current withstand test and corrosion resistance test according to GB / T21698. The comprehensive test results are shown in Table 1.

[0073] Table 1. Test results of the comprehensive performance of conductive polymer materials in Examples 1-2 and Control Groups 1-2

[0074] 2. Conductive polymer materials from Examples 1-2 and Control Groups 1-2 were cut into samples with a diameter of 20 mm and a height of 40 mm. Electrochemical tests were performed using a Gamry electrochemical workstation. The reference electrode in the three-electrode system was a saturated calomel electrode, the auxiliary electrode was a platinum electrode, and the working electrode was the sample. The open-circuit potential of the test material in a soil simulation solution was analyzed, with a test area of ​​25 cm². 2 The test duration was 500 seconds. The composition of the soil simulation solution was: NaCl 0.028 g / L, Na₂SO₄ 0.190 g / L, NaHCO₃ 0.110 g / L, pH 7.5. The results are as follows: Figure 1 As shown.

[0075] Analysis Table 1 and Figure 1 It can be seen that the conductive polymer material of this application has a low volume resistivity and good mechanical properties. It also exhibits better surface chemical stability in the simulated soil solution, with an open-circuit potential stable at around 0.1V, and a lower corrosion tendency compared to control groups 1-2, making it less prone to corrosion.

[0076] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multiphase composite conductive polymer material, characterized in that: The components include the following parts by weight: Polythiophene 25-40 parts; polyurethane 20-35 parts; conductive polymer microtubes 10-20 parts; two-dimensional nano-conductive filler 10-15 parts; lubricant 3-5 parts; coupling agent 1-3 parts; flame retardant 2-5 parts; antioxidant 1-3 parts; antioxidant 1.5-2.5 parts; The conductive polymer microtubules are prepared from cellulose microtubules, monomers, and protein thiolation derivatives. The protein thiolation derivative was prepared from zein and thioacetic acid.

2. The multiphase composite conductive polymer material according to claim 1, characterized in that: The method for preparing the conductive polymer microtubes includes the following steps: 1) Disperse cellulose microtubules and protein thiolation derivatives in a solvent, then add monomers and stir thoroughly to obtain a dispersion; 2) Add the initiator dropwise to the dispersion, react in an ice bath, centrifuge, wash the resulting precipitate with deionized water, and dry it under vacuum.

3. The multiphase composite conductive polymer material according to claim 2, characterized in that: The mass ratio of the cellulose microtubules to the protein thiolation derivative is 1:(0.1-0.2).

4. The multiphase composite conductive polymer material according to claim 2, characterized in that: The monomer is thiophene.

5. The multiphase composite conductive polymer material according to claim 2, characterized in that: The preparation method of the protein thiolation derivative includes the following steps: dissolving zein in an ethanol solution, adding thioacetic acid, stirring overnight at room temperature, then precipitating, centrifuging, and drying to obtain the product.

6. The multiphase composite conductive polymer material according to claim 5, characterized in that: The mass ratio of zein to thioacetic acid is 1:(0.5-0.65).

7. The multiphase composite conductive polymer material according to claim 1, characterized in that: The two-dimensional nano-conductive filler is Ti3C2T. X One of MXene, graphene, and fullerene.

8. The multiphase composite conductive polymer material according to claim 1, characterized in that: The lubricant is one of molybdenum disulfide, graphite, and tungsten disulfide; And / or, the coupling agent is an aluminate coupling agent; And / or, the flame retardant is one of DOPO, halogen-free flame retardant, and melamine.

9. A method for preparing a multiphase composite conductive polymer material as described in any one of claims 1-8, characterized in that: The process includes the following steps: mixing polythiophene, polyurethane, conductive polymer microtubes, two-dimensional nano-conductive fillers, lubricants, coupling agents, flame retardants, antioxidants, and granulating the mixture by extrusion.

10. The method for preparing the multiphase composite conductive polymer material according to claim 9, characterized in that: The extrusion temperature is 130-185℃.

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