CN116144163A - Temperature-resistant conductive polymer composite material and preparation method and application thereof - Google Patents
Temperature-resistant conductive polymer composite material and preparation method and application thereof Download PDFInfo
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- CN116144163A CN116144163A CN202310394752.XA CN202310394752A CN116144163A CN 116144163 A CN116144163 A CN 116144163A CN 202310394752 A CN202310394752 A CN 202310394752A CN 116144163 A CN116144163 A CN 116144163A
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Abstract
The application discloses a temperature-resistant conductive polymer composite material and a preparation method and application thereof, and belongs to the field of grounding of electric power, petrifaction, traffic and communication. The heat-resistant conductive polymer composite material comprises the following components: 20-40 parts of thermoplastic polyurethane; 15-25 parts of thermoplastic polyimide; 20-35 parts of polytetrathiafulvalene conductive polymer; 1-5 parts of a lubricant; 1-3 parts of a coupling agent; 0.5-2 parts of an antioxidant; 2-5 parts of a flame retardant; 1-5 parts of an anti-aging agent; the parts are calculated by mass parts. The temperature-resistant conductive polymer composite material has good conductivity and good flexibility.
Description
Technical Field
The application relates to a temperature-resistant conductive polymer composite grounding material, a preparation method and application thereof, and belongs to the field of grounding of electric power, petrifaction, traffic and communication.
Background
The key infrastructure such as power, petrifaction, traffic, communication and the like has more and more strict grounding requirements, and particularly, the stability, high efficiency and full service life of a power grid grounding system become one of the key factors of power safety. The faults of the grounding network of the power transmission and transformation station and the power distribution station can cause serious accidents of the power grid and the power supply area, and the surrounding personal safety is endangered. And corrosion failure of the ground material results in an increase in the ground resistance or breakage of the ground material is a major cause of ground network failure. The traditional grounding materials mainly comprise carbon steel, galvanized steel, copper-clad steel or copper and the like, all face the problem of metal corrosion, and particularly under the corrosive soil with acidity, alkalinity, high salinity and large water content, the grounding materials generally need to be modified or even replaced within 5-10 years, and the total life cycle cost is greatly increased.
In response to the long-standing corrosion problem of metal grounding materials, related researchers have developed some nonmetallic grounding materials, such as flexible graphite grounding materials and organic grounding materials. However, these materials have respective drawbacks when actually used in the field, such as: the flexible graphite grounding material has poor power frequency tolerance and poor longitudinal distal drainage capacity, and is not suitable for areas with debris flow or long-term water flow flushing; the traditional high-molecular conductive material has poor temperature resistance, and when the current is too large and the local high temperature is caused, the drainage effect is reduced, and the grounding safety is threatened. Therefore, the novel grounding material with high conductivity, high corrosion resistance and high temperature resistance is developed, and has important significance for prolonging the service life of the grounding grid, guaranteeing the safety of the power grid and reducing the construction and maintenance cost of the grounding grid. In the prior art CN115536958A, it is disclosed that a thermoplastic elastomer is obtained by copolymerizing tetrathiafulvalene with styrene and butadiene, so that the thermoplastic elastomer has the advantages of an elastomer while improving conductivity; and a large amount of conductive filler is added into the composite material. The flexibility of the composite material is deteriorated due to the addition of a large amount of conductive filler (15-35 parts).
Disclosure of Invention
According to a first aspect of the present application, a temperature resistant conductive polymer composite is provided. The conductive polymer composite material greatly improves the conductivity by adding the conductive polymer formed by copolymerizing tetrathiafulvalene and cobalt salt, and meanwhile, the conductive filler to be added in the prior art is not needed, so that the elongation at break of the composite material is improved.
The heat-resistant conductive polymer composite material comprises the following components:
20-40 parts of thermoplastic polyurethane;
15-25 parts of thermoplastic polyimide;
20-35 parts of polytetrathiafulvalene conductive polymer;
1-5 parts of a lubricant;
1-3 parts of a coupling agent;
0.5-2 parts of antioxidant;
2-5 parts of flame retardant;
1-5 parts of an anti-aging agent;
the parts are calculated by mass parts.
Optionally, the particle size of the conductive polymer composite material is 30 μm-2 mm.
Optionally, during extrusion production, the particle size of the conductive polymer composite material is 1 mm-2 mm;
when the conductive polymer composite material is used for electrostatic spraying, the particle size of the conductive polymer composite material is 30-35 mu m.
Alternatively, the polytetrathiafulvalene conductive polymer is obtained by forming a coordination polymer by tetrathiafulvalene and cobalt atoms.
And copolymerizing a mixture containing tetrathiafulvalene and cobalt salt to obtain the polytetrathiafulvalene conductive polymer.
Optionally, the thermoplastic polyurethane is selected from at least one of Huntsman IROGRAN A85D 6003, pasteur 685A, lubo ESTANE 2355-75A.
Optionally, the weight average molecular weight of the thermoplastic polyimide is 20000-40000.
Alternatively, the weight average molecular weight of the thermoplastic polyimide is independently selected from any value or range between any two values of 20000, 21000, 22000, 23000, 24000, 25000, 26000, 27000, 28000, 29000, 30000, 31000, 32000, 33000, 34000, 35000, 36000, 37000, 38000, 39000, 40000.
Optionally, the glass transition temperature of the thermoplastic polyimide is 180-220 ℃.
The glass transition temperature of the thermoplastic polyimide is 201 ℃.
Optionally, the lubricant is at least one selected from graphite, molybdenum disulfide, niobium diselenide, and paraffin.
Optionally, the coupling agent is at least one selected from silane coupling agents and aluminate coupling agents.
Optionally, the antioxidant is at least one selected from flavonoid antioxidant, beta-naphthoflavone, eupatorium flavone and licoflavone A.
Optionally, the flame retardant is at least one selected from phosphorus-nitrogen halogen-free flame retardant, melamine, ammonium polyphosphate and DOPO derivative.
Optionally, the anti-aging agent is at least one selected from 6-ethoxy-2, 4-trimethyl-1, 2 dihydroquinoline and N-phenyl-alpha-aniline.
According to a second aspect of the present application, a method of preparing a conductive polymer composite is provided.
The preparation method of the conductive polymer composite material comprises the following steps:
s1, obtaining thermoplastic polyimide powder;
s2, copolymerizing a mixture containing tetrathiafulvalene and cobalt salt to obtain a polytetrathiafulvalene conductive polymer;
and S3, extruding and granulating materials containing thermoplastic polyurethane, thermoplastic polyimide powder, polytetrathiafulvalene conductive polymer, lubricant, coupling agent, antioxidant, flame retardant and anti-aging agent to obtain the conductive polymer composite material.
Optionally, in step S2, the tetrathiafulvalene is selected from at least one of bis (carbonyldithio) tetrathiafulvalene, formyltetrathiafulvalene, and tetra (methylthio) tetrathiafulvalene.
Optionally, in step S2, the cobalt salt is selected from at least one of cobalt acetate, cobalt chloride and cobalt nitrate.
Optionally, in step S2, the mass ratio of the tetrathiafulvalene to the cobalt salt is 1: 1-8: 1.
the tetrathiafulvalene is by mass and the cobalt salt is by mass.
Alternatively, the mass ratio of the tetrathiafulvalene to the cobalt salt is independently selected from 1: 1. 2: 1. 3: 1. 4: 1. 5: 1. 6: 1. 7: 1. 8:1 or a range value between any two.
Optionally, in step S2, the conditions for copolymerization are as follows:
the time is 8 h-24 h;
the temperature is 100-150 ℃.
Alternatively, the time is independently selected from any value or range of values between any two of 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, 24 h.
Alternatively, the temperature is independently selected from any value or range of values between any two of 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃, 150 ℃.
Optionally, in step S3, extrusion pelletization includes twin-screw extrusion, single-screw extrusion.
Optionally, in step S3, during twin-screw extrusion, the temperatures of a conveying section, a melting section, a mixing section, an exhaust section, a homogenizing section and a machine head of the twin-screw extruder are 130-150 ℃, 180-200 ℃, 195-205 ℃, 185-195 ℃, 175-195 ℃ and 195-205 ℃ in sequence.
Optionally, in step S3, during single screw extrusion, the processing temperature of the single screw extruder is sequentially: the first zone 170-185 ℃, the second zone 195-205 ℃, the third zone 195-205 ℃ and the handpiece 185-195 ℃.
Optionally, the method comprises the following steps:
a1, firstly obtaining a polyamic acid precursor solution, preparing polyimide through chemical imidization dehydration under the action of a dehydrating agent and a catalyst, and drying to obtain polyimide powder;
a2, copolymerizing a mixture containing tetrathiafulvalene and cobalt salt to obtain a polytetrathiafulvalene conductive polymer;
a3, extruding and granulating materials containing thermoplastic polyurethane, thermoplastic polyimide powder, polytetrathiafulvalene conductive polymer, lubricant, coupling agent, antioxidant, flame retardant and anti-aging agent to obtain the conductive polymer composite material.
Optionally, in step A1, the polyamic acid precursor solution is stirred in an inert atmosphere at normal temperature.
Optionally, in step A1, the dehydrating agent is at least one selected from acetic anhydride and phthalic anhydride.
Optionally, in step A1, the catalyst is at least one selected from isoquinoline and pyridine.
Optionally, in step A1, the mixing conditions are as follows:
the reaction time of the polyamic acid is 20-h to 30-h.
According to a third aspect of the present application there is provided the use of a conductive polymer composite.
The conductive polymer composite material and/or the application of the conductive polymer composite material obtained by the preparation method in the grounding material.
Optionally, the method comprises the following steps:
placing the conductive polymer composite material and the metal rod core on a production line, extruding, and heating to obtain a temperature-resistant conductive polymer composite grounding material;
or alternatively, the first and second heat exchangers may be,
grinding the conductive polymer composite material by adopting an air classifying mill ACM, passing through a 180-target standard sieve to obtain a temperature-resistant conductive polymer composite powder coating, then carrying out electrostatic powder spraying on the surface of a metal rod, and baking at 200 ℃ for 20 min to obtain the temperature-resistant conductive polymer composite grounding material.
Optionally, in the extrusion process, the processing temperature of the single screw extruder is as follows: the first zone 170-195 ℃, the second zone 195-210 ℃, the third zone 195-205 ℃ and the head 190-200 ℃.
Optionally, in the heating process, the thermal extension is controlled to be 15% -25%.
The beneficial effects that this application can produce include:
1) The thermoplastic polyurethane used in the conductive polymer composite material has the characteristics of an elastomer and can provide good mechanical properties; the thermoplastic polyimide is a temperature-resistant, acid-alkali-resistant and corrosion-resistant polymer, so that the temperature resistance and corrosion resistance of the composite material can be improved, and meanwhile, the glass transition temperature of the thermoplastic polyimide is lower than that of the thermosetting polyimide, and the thermoplastic polyimide can be processed and molded at a lower temperature; the polytetrathiafulvalene conductive polymer is a conductive polymer formed by copolymerizing tetrathiafulvalene and cobalt salt, has good conductivity, and improves the conductivity of a polymer composite material.
2) The heat-resistant conductive polymer composite material provided by the application can be wrapped or electrostatically sprayed outside a metal fiber core to prepare a grounding material, has excellent grounding drainage performance, can quickly and transversely transmit current to a far end through a metal inner core in the grounding material when fault current and lightning current are encountered, and can quickly and longitudinally diffuse into soil through a heat-resistant conductive polymer composite coating layer to achieve quick drainage; the resistivity is not more than 1/10 of the resistivity of the buried soil. The corrosion-resistant conductive polymer composite grounding material also has good acid-base and seawater corrosion resistance, the annual corrosion is less than 0.03%, and the water absorption is less than 0.05%.
3) The temperature-resistant conductive polymer composite material provided by the application can be widely applied to highly corrosive soil, coasts and high pollution areas, has excellent environmental universality and is environment-friendly; the problem that the grounding device fails due to corrosion is solved, and the full life cycle service of the grounding device is realized.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Unless otherwise indicated, both the starting materials and the catalysts in the examples of the present application were purchased commercially. The parts in the following examples are calculated as parts by mass.
Example 1
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
First, 10.0 parts (g) of 1, 3-bis (4-aminophenoxy) benzene and 0.7 parts of 4,4' -diaminodiphenyl ether were added in a 500 mL beaker equipped with a magnetic stirrer, followed by 200.0 parts (g) of an N, N-dimethylacetamide solution, and stirred to sufficiently dissolve the diamine. Then 10.5 parts of 3,3', 4' -biphenyltetracarboxylic dianhydride (solid content in the mixed solution: 10%) was slowly added. After 3,3', 4' -biphenyl tetracarboxylic dianhydride is added, the reaction is carried out for 24 hours at room temperature under the protection of nitrogen, and finally the pale yellow polyamic acid solution is obtained. Adding 25.0 parts of acetic anhydride and 12.5 parts of isoquinoline into the polyamic acid solution at room temperature, stirring for 2 hours, heating to 85 ℃ and continuously stirring for 5 hours, cooling to room temperature, pouring the reaction mixture into ethanol to obtain fibrous polyimide, filtering the polyimide material, fully washing the polyimide material with hot ethanol, and drying overnight in a vacuum drying oven at 60 ℃ to obtain thermoplastic polyimide powder.
50.0 parts of tetra (methylthio) tetrathiafulvalene and 12.5 parts of cobalt acetate are mixed, and the mixture is copolymerized at 133 ℃ for 12 h to obtain the polytetrathiafulvalene conductive polymer.
(2) Preparation of temperature-resistant conductive polymer composite material
40.0 parts of thermoplastic polyurethane, 20.0 parts of thermoplastic polyimide, 30.0 parts of polytetrathiafulvalene conductive polymer, 1.0 part of lubricant molybdenum disulfide, 1.5 parts of lubricant niobium diselenide, 2.0 parts of coupling agent aluminate, 1.0 part of antioxidant beta-naphthalene flavone, 0.3 part of antioxidant eupatorium flavone, 3.0 parts of flame retardant DOPO, 0.5 part of antioxidant 6-ethoxy-2, 4-trimethyl-1, 2 dihydroquinoline and 0.5 part of antioxidant N-phenyl-alpha-aniline are mixed for 9 min; and then adding the uniformly mixed materials into a double-screw extruder for extrusion granulation, and then, putting the granules into a hot air dryer for drying to obtain the conductive polymer composite material. The temperatures of a conveying section, a melting section, a mixing section, an exhaust section, a homogenizing section and a machine head of the double-screw extruder are 130-150 ℃, 180-200 ℃, 195-205 ℃, 185-195 ℃, 175-195 ℃ and 195-205 ℃ in sequence.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
(a) And placing the conductive polymer composite material and the metal rod core on a production line, extruding, and heating to obtain the temperature-resistant conductive polymer composite grounding material. In the extrusion process, the processing temperature of the single screw extruder is as follows: the first area 170-195 ℃, the second area 195-210 ℃, the third area 195-205 ℃ and the machine head 190-200 ℃, and the thermal extension is controlled to be 15-25% in the heating process.
(b) And grinding the conductive polymer composite material by adopting an air classifying mill ACM, and passing through a 180-target standard sieve to obtain the temperature-resistant conductive polymer composite powder coating. Then, powder is sprayed on the surface of the metal rod in an electrostatic way, and the metal rod is baked for 20 min at 200 ℃ to obtain the temperature-resistant conductive polymer composite grounding material. The long-life composite anode can also be prepared by electrostatic spraying of conductive polymer powder coating on the surface of the anode of the lithium ion battery.
The properties are shown in Table 1.
Example 2
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
35.0 parts of thermoplastic polyurethane, 25.0 parts of thermoplastic polyimide and 30.0 parts of polytetrathiafulvalene conductive polymer. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again. The properties are shown in Table 1.
Example 3
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
30.0 parts of thermoplastic polyurethane, 25.0 parts of thermoplastic polyimide and 35.0 parts of polytetrathiafulvalene conductive polymer. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again. The properties are shown in Table 1.
Example 4
((1) preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
40.0 parts of thermoplastic polyurethane, 25.0 parts of thermoplastic polyimide and 20.0 parts of polytetrathiafulvalene conductive polymer. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again. The properties are shown in Table 1.
Example 5
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
40.0 parts of thermoplastic polyurethane, 15.0 parts of thermoplastic polyimide and 35.0 parts of polytetrathiafulvalene conductive polymer. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again. The properties are shown in Table 1.
The performance of the corrosion-resistant conductive polymer composite grounding materials prepared in examples 1 to 5 was tested, and the results are shown in tables 1 and 2.
Table 1 Performance test of conductive Polymer composite materials in examples 1 to 5
Note that: the ultraviolet aging test in Table 1 refers to GB/T2951.11-2008, the air oven aging test refers to standard GB/T2951.12-2008, the water absorption test refers to 9.2 (by weight) in standard GB/T2951.13-2008, the resistivity test refers to standard GB/T3048.3-2007, and the industrial frequency heavy current reference refers to the specification in standard DL/T1342-2014.
TABLE 2 Performance test of Corrosion resistant conductive Polymer-based Metal composite grounding electrode in examples 1-5
Note that: all tests in Table 2 refer to the relevant specifications in composite ground State of the art GB/T21698-2008.
From Table 1, it can be seen that the conductive materials prepared in examples 1 to 5 have excellent weather resistance, water absorption resistance, resistivity of about 0.95-1.48 Ω & cm, good conductivity, and no softening or melting under high current at power frequency. As can also be seen from Table 2, the grounding materials prepared in examples 1 to 5 have excellent corrosion resistance, excellent thermal stability, high power frequency current resistance and freeze-thaw cycle resistance in both neutral high-salt and acidic alkaline environments. The grounding material prepared by the invention can solve the problem of failure of a grounding device caused by corrosion, can be used for grounding drainage such as fault current, lightning current and the like of a power grid system and large-current remote drainage, realizes the full life cycle service of the power grid grounding device, can be applied to materials of electric power, traffic and communication systems, has excellent conductivity, low resistivity, thermal stability, corrosion resistance, power frequency large current resistance and freeze thawing resistance, and simultaneously has excellent grounding environment universality, excellent grounding performance and environmental friendliness.
In the prior art CN115536958A, the resistivity is about 1.5-2.5 omega cm, and the elongation at break is 39-61%.
Comparative example 1
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
The polytetrathiafulvalene conductive polymer is replaced by polypyrrole, and the weight ratio is 30.0. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again.
The conductive materials in example 1 and comparative example 1 were subjected to resistivity tests using a four-probe tester, wherein the conductive material in example 1 had a volume resistivity of 1.12 Ω·cm and a surface resistivity of 1.97 Ω; the volume resistivity of the conductive material in comparative example 1 was 9.39Ω·cm, and the surface resistivity was 15.78Ω. Therefore, the polytetrathiafulvalene conductive polymer can reduce the resistivity of the composite grounding material to a greater extent than polypyrrole.
Comparative example 2
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
The polytetrathiafulvalene conductive polymer is replaced by polyaniline, and the weight ratio is 30.0. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again.
The conductive materials in example 1 and comparative example 2 were subjected to resistivity tests using a four-probe tester, wherein the conductive material in example 1 had a volume resistivity of 1.12 Ω·cm and a surface resistivity of 1.97 Ω; the volume resistivity of the conductive material in comparative example 2 was 10.47. Omega. Cm, and the surface resistivity was 17.03. Omega. Therefore, the polytetrathiafulvalene conductive polymer can reduce the resistivity of the composite grounding material to a greater extent than polyaniline.
Comparative example 3
(1) Preparation of thermoplastic polyimide and polytetrathiafulvalene conductive polymer
The same as in example 1 will not be described again.
(2) Preparation of temperature-resistant conductive polymer composite material
The thermoplastic polyimide was replaced with low density polyethylene in 40.0 parts. The other parts are the same as in example 1, and will not be described again.
(3) Preparation of temperature-resistant conductive polymer composite grounding material
The same as in example 1 will not be described again.
The glass transition temperatures of example 1 and comparative example 3 were measured using a thermal analyzer, with example 1 being 201℃and comparative example 3 being 103 ℃. It can be seen that without the thermoplastic polyimide, the temperature resistance of the composite material is greatly reduced.
The foregoing description is only a few examples of the present application and is not intended to limit the present application in any way, and although the present application is disclosed in the preferred examples, it is not intended to limit the present application, and any person skilled in the art may make some changes or modifications to the disclosed technology without departing from the scope of the technical solution of the present application, and the technical solution is equivalent to the equivalent embodiments.
Claims (10)
1. The heat-resistant conductive polymer composite material is characterized by comprising the following components:
20-40 parts of thermoplastic polyurethane;
15-25 parts of thermoplastic polyimide;
20-35 parts of polytetrathiafulvalene conductive polymer;
1-5 parts of a lubricant;
1-3 parts of a coupling agent;
0.5-2 parts of antioxidant;
2-5 parts of flame retardant;
1-5 parts of an anti-aging agent;
the parts are calculated by mass parts.
2. The conductive polymer composite according to claim 1, wherein the particle size of the conductive polymer composite is 30 μm to 2 mm.
3. The conductive polymer composite according to claim 1, wherein the polytetrathiafulvalene conductive polymer is obtained by forming a coordination polymer from tetrathiafulvalene and cobalt atoms.
4. The conductive polymer composite according to claim 1, wherein the thermoplastic polyurethane is at least one selected from Huntsman IROGRAN A85 d 6003, basf 685A, lubo ESTANE 2355-75A;
the weight average molecular weight of the thermoplastic polyimide is 20000-40000;
the glass transition temperature of the thermoplastic polyimide is 180-220 ℃.
5. The conductive polymer composite according to claim 1, wherein the lubricant is at least one selected from the group consisting of graphite, molybdenum disulfide, niobium diselenide, and paraffin wax;
the coupling agent is at least one selected from silane coupling agents and aluminate coupling agents;
the antioxidant is at least one selected from flavonoid antioxidants, beta-naphthoflavone, eupatorium flavone and licoflavone A;
the flame retardant is at least one selected from phosphorus-nitrogen halogen-free flame retardant, melamine, ammonium polyphosphate and DOPO derivatives;
the anti-aging agent is at least one selected from 6-ethoxy-2, 4-trimethyl-1, 2 dihydroquinoline and N-phenyl-alpha-aniline.
6. The method for preparing the conductive polymer composite material according to any one of claims 1 to 5, comprising the steps of:
s1, obtaining thermoplastic polyimide powder;
s2, copolymerizing a mixture containing tetrathiafulvalene and cobalt salt to obtain a polytetrathiafulvalene conductive polymer;
and S3, extruding and granulating materials containing thermoplastic polyurethane, thermoplastic polyimide powder, polytetrathiafulvalene conductive polymer, lubricant, coupling agent, antioxidant, flame retardant and anti-aging agent to obtain the conductive polymer composite material.
7. The preparation method according to claim 6, wherein in the step S2, the tetrathiafulvalene is at least one selected from the group consisting of bis (carbonyldithio) tetrathiafulvalene, formyltetrathiafulvalene and tetra (methylthio) tetrathiafulvalene;
in the step S2, the cobalt salt is at least one selected from cobalt acetate, cobalt chloride and cobalt nitrate;
in the step S2, the mass ratio of the tetrathiafulvalene to the cobalt salt is 1: 1-8: 1, a step of;
in step S2, the copolymerization conditions are as follows:
the time is 8 h-24 h;
the temperature is 100-150 ℃;
in step S3, extrusion granulation comprises twin-screw extrusion and single-screw extrusion;
in the step S3, during twin-screw extrusion, the temperatures of a conveying section, a melting section, a mixing section, an exhaust section, a homogenizing section and a machine head of the twin-screw extruder are 130-150 ℃, 180-200 ℃, 195-205 ℃, 185-195 ℃, 175-195 ℃ and 195 ℃ in sequence;
in the step S3, during single screw extrusion, the processing temperature of the single screw extruder is as follows in sequence: the first zone 170-185 ℃, the second zone 195-205 ℃, the third zone 195-205 ℃ and the handpiece 185-195 ℃.
8. The method of manufacturing according to claim 6, comprising the steps of:
a1, firstly obtaining a polyamic acid precursor solution, preparing polyimide through chemical imidization dehydration under the action of a dehydrating agent and a catalyst, and drying to obtain polyimide powder;
a2, copolymerizing a mixture containing tetrathiafulvalene and cobalt salt to obtain a polytetrathiafulvalene conductive polymer;
a3, extruding and granulating materials containing thermoplastic polyurethane, the thermoplastic polyimide powder, the polytetrathiafulvalene conductive polymer, the lubricant, the coupling agent, the antioxidant, the flame retardant and the anti-aging agent to obtain the conductive polymer composite material;
in the step A1, the polyamic acid precursor solution is stirred in an inert atmosphere at normal temperature to prepare the polyamic acid;
in the step A1, the dehydrating agent is at least one selected from acetic anhydride and phthalic anhydride;
in the step A1, the catalyst is at least one selected from isoquinoline and pyridine;
in step A1, the mixing conditions are as follows:
the reaction time of the polyamic acid is 20-h to 30-h.
9. The application of the conductive polymer composite material obtained by the preparation method of claim 6 in a grounding material.
10. The use according to claim 9, characterized by the steps of:
placing the conductive polymer composite material and the metal rod core on a production line, extruding, and heating to obtain a temperature-resistant conductive polymer composite grounding material;
or alternatively, the first and second heat exchangers may be,
grinding the conductive polymer composite material by adopting an air classifying mill ACM, passing through a 180-target standard sieve to obtain a temperature-resistant conductive polymer composite powder coating, then carrying out electrostatic powder spraying on the surface of a metal rod, and baking at 200 ℃ for 20 min to obtain a temperature-resistant conductive polymer composite grounding material;
in the extrusion process, the processing temperature of the single screw extruder is as follows: the first zone 170-195 ℃, the second zone 195-210 ℃, the third zone 195-205 ℃ and the handpiece 190-200 ℃;
in the heating process, the thermal extension is controlled to be 15% -25%.
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