CN114773724A - High-conductivity thermoplastic composite material and preparation method and application thereof - Google Patents
High-conductivity thermoplastic composite material and preparation method and application thereof Download PDFInfo
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- CN114773724A CN114773724A CN202210293762.XA CN202210293762A CN114773724A CN 114773724 A CN114773724 A CN 114773724A CN 202210293762 A CN202210293762 A CN 202210293762A CN 114773724 A CN114773724 A CN 114773724A
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- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 24
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 12
- 239000004917 carbon fiber Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000012745 toughening agent Substances 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000012764 mineral filler Substances 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011231 conductive filler Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 239000002041 carbon nanotube Substances 0.000 description 3
- -1 landification Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012994 photoredox catalyst Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-conductivity thermoplastic composite material and a preparation method and application thereof, and relates to the field of conductive composite materials. The high-conductivity thermoplastic composite material comprises the following components in parts by weight: 50-80 parts of thermoplastic resin, 20-55 parts of conductive carbon powder and 0.1-10 parts of conductive fiber; wherein the conductivity of the conductive fibers is more than 100 times of that of the conductive carbon powder. According to the invention, by compounding the high-content conductive carbon powder and a small amount of conductive fibers, the advantages of low contact resistance of the conductive carbon powder and the advantages of macro communication of the conductive fibers can be respectively exerted, the lower limit of the resistance of the composite material can be greatly reduced, the usage amount of the high-cost conductive fibers can be effectively reduced, and the composite material is ensured to have excellent mechanical properties.
Description
Technical Field
The invention relates to the field of conductive composite materials, in particular to a high-conductivity thermoplastic composite material and a preparation method and application thereof.
Background
Most of the existing conductive composite materials are prepared by adding one of conductive fillers such as carbon black, carbon fibers, carbon nanotubes, metal fibers, metal powder and the like into matrix resin. Among these conductive fillers, carbon black is currently the most widely used, and has a high cost performance, but its intrinsic resistance is relatively high, and when it is saturated and filled, the resistance of the composite material is difficult to continue to decrease greatly, and thus it is difficult to meet the demand of low-resistance composite materials. Carbon fibers, carbon nanotubes, and metal fibers have low intrinsic resistance values, but are expensive. In particular, when a composite material with a relatively low resistance is obtained, a large amount of conductive filler is often added to the matrix resin so that the conductive filler forms a continuous network structure in the matrix resin, but this may reduce various mechanical properties (such as tensile strength, fatigue resistance, etc.) of the composite material. In addition, in the case of conductive fibers (metal fibers, carbon fibers), the fibers are easily coated with resin after injection molding, which rather greatly increases the contact resistance of the material surface.
In order to solve the above problems, in the prior art, various conductive fillers are compounded, for example, metal conductive powder and carbon fiber are compounded, so that impact elasticity and tensile property can be improved. If the carbon nano tube and the metal fiber are compounded, the impact strength can be improved, and the excellent electromagnetic shielding performance is also ensured. However, in the existing improvement on the conductive filler, the dosage of the metal fiber is relatively high, and is generally about 10-20 wt% of the matrix resin, which not only increases the production cost, but also causes the processability of the composite material to be poor, and limits the application scene.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide a high-conductivity thermoplastic composite material, and a preparation method and application thereof, which can effectively reduce the consumption of conductive fibers, reduce the production cost and simultaneously enable the composite material to have high conductivity and high mechanical properties.
In order to realize the purpose, the technical scheme adopted by the invention is as follows: a high-conductivity thermoplastic composite material comprises the following components in parts by weight: 50-80 parts of thermoplastic resin, 20-55 parts of conductive carbon powder and 0.1-10 parts of conductive fiber;
the conductivity of the conductive fibers is more than 100 times that of the conductive carbon powder, and preferably, the conductivity of the conductive fibers is 30000-45000 times that of the conductive carbon powder. Specifically, the method for measuring the conductivity comprises the following steps: the resistance value and the diameter of the conductive fiber with a specific length are measured, and then the conductivity is calculated by the following formula:
in the above formula, σ is the conductivity of the conductive fiber, D is the diameter of the conductive fiber, R is the resistance of the conductive fiber of length L, and L is the length of the conductive fiber.
The conductivity test method of the conductive carbon powder comprises the steps of placing the conductive carbon powder in a cylindrical die with the diameter of 10mm, compacting the conductive carbon powder under the pressure of 30MPa by using a hydraulic press, measuring the resistance values of the upper end surface and the lower end surface of the cylinder, and calculating by using the formula to obtain the conductivity.
Because the conductivity of the conductive fiber is more than 100 times higher than that of the conductive carbon powder, the advantage of low contact resistance of the conductive carbon powder and the advantage of macroscopic communication of the conductive fiber can be respectively exerted by compounding the high-content conductive carbon powder and a small amount of conductive fiber, and the lower limit of the resistance of the composite material can be greatly reduced; meanwhile, the usage amount of high-cost conductive fibers is effectively reduced; and the composite material is ensured to have excellent mechanical property.
Illustratively, the thermoplastic resin is used in an amount of 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, or 78 parts, but is not limited thereto. Preferably, the thermoplastic resin is used in an amount of 50 to 60 parts. The composite material prepared by the thermoplastic resin with the dosage in the range has better mechanical property and higher conductivity.
Specifically, when the amount of the conductive carbon powder is more than 55 parts, the processability is greatly reduced, and it is difficult to obtain a usable material, and when the amount of the conductive carbon powder is less than 20 parts. The obtained composite material has high resistance. Exemplary, the amount of the conductive carbon powder is 21 parts, 23 parts, 25 parts, 27 parts, 29 parts, 31 parts, 33 parts, 35 parts, 37 parts, 39 parts, 41 parts, 43 parts, 45 parts, 47 parts, 49 parts, 51 parts, 53 parts, but is not limited thereto. Preferably, the amount of the conductive carbon powder is 40-50 parts, and the conductive carbon powder can form a nearly saturated physical path in the matrix resin to reduce the conductivity of the composite material.
Illustratively, the conductive fiber is used in an amount of 0.15 parts, 0.3 parts, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.5 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, or 9 parts, but is not limited thereto. Preferably, the use amount of the conductive fiber is 0.5-2 parts, and the composite material prepared by the conductive fiber in the use amount range has better mechanical property and higher conductivity.
In one embodiment of the present invention, the weight ratio of the conductive carbon powder to the conductive fiber is (20-100): 1.
specifically, after a great deal of experimental research, the inventors of the present application found that when the amount of the conductive carbon powder and the conductive fiber is controlled to the above ratio, the resistance of the composite material is greatly reduced, and the composite material has a significant synergistic effect and a cost-to-efficiency ratio of the practical application.
In one embodiment of the present invention, the weight of the conductive carbon powder and the conductive fiber is (25-50): 1. after a large amount of creative experiments, the inventor of the application finds that when the conductive carbon powder and the conductive fiber are in the proportion, the comprehensive performance of the finally prepared high-conductivity thermoplastic composite material reaches the best.
In one embodiment of the present invention, the melting temperature of the thermoplastic resin is 50 to 400 ℃, and specifically, the melting temperature of the thermoplastic resin is determined by measuring the glass transition temperature or melting temperature of the material by DSC, and selecting the higher of the two as the melting temperature. The thermoplastic resin may be selected from one or more of PE, PP, ABS, PC, PPE, PA, polyether block polyamide, for example, but not limited thereto. Preferably, the thermoplastic resin is one or more of PE, PP and PC, and the thermoplastic resins can realize higher filling.
In one embodiment of the invention, the conductive fibers are metal fibers and/or carbon fibers with a conductivity of > 104And (5) S/m. The conductive fiber is one or more selected from stainless steel fiber, carbon fiber, copper fiber, chromium fiber, gold fiber, silver fiber, tungsten fiber, nickel fiber, and nickel-plated carbon fiber, but is not limited thereto. Preferably, the conductive fiber is stainless steel fiber and/or carbon fiber, and has excellent conductivity and high cost performance.
In one embodiment of the present invention, the conductive carbon powder is conductive carbon black with an oil absorption value of 100-400cm3100g, the oil absorption of the conductive carbon black is measured according to the method of GB/T3780.2-2003.
In one embodiment of the invention, the composition further comprises the following components in parts by weight: 0.1-10 parts of an additive; the additive is one or more of an antioxidant, a toughening agent, a lubricant and a mineral filler. Specifically, the antioxidant can be hindered phenol antioxidant such as SONOX1010, but is not limited thereto. The toughening agent can be POE, but is not limited to POE. The lubricant can be selected from EBS, but is not limited to EBS; the mineral filler may be talc and/or calcium carbonate powder, but is not limited thereto. Correspondingly, the invention also discloses a preparation method of the high-conductivity thermoplastic composite material, which comprises the following steps:
(1) weighing various raw materials according to a ratio, and uniformly mixing to obtain a mixed material;
(2) adding the mixed material into a double-screw extruder for extrusion granulation to obtain the high-conductivity thermoplastic composite material; wherein the length-diameter ratio of the double-screw extruder is (30-60): 1, the processing temperature is 120-400 ℃.
Correspondingly, the invention also discloses application of the high-conductivity thermoplastic composite material in automobiles, household appliances, electronic appliances and electromagnetic shielding devices.
The implementation of the invention has the following beneficial effects:
according to the invention, through compounding of the high-content conductive carbon powder and a small amount of conductive fibers, the advantages of low contact resistance of the conductive carbon powder and the advantages of macroscopic communication of the conductive fibers can be respectively exerted, the lower limit of resistance of the composite material can be greatly reduced, the usage amount of the high-cost conductive fibers can be effectively reduced, and the composite material is ensured to have excellent mechanical properties.
Detailed Description
To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples.
In the examples, the experimental methods used were, unless otherwise specified, all the conventional methods, and the materials, reagents, etc., used were, unless otherwise specified, commercially available, and the toughening agents, antioxidants, lubricants, and mineral fillers in the parallel examples and comparative examples of the present invention were the same commercial products.
The materials used in the examples and comparative examples are now described below, but are not limited to these materials:
a1: PP resin, landification, PP SP179, melt temperature 170 ℃;
a2: PE resin, gillin petrochemical, LLDPE 7042, melt temperature 130 ℃;
a3: PA resin, Balin petrochemical, PA6 YH400, melt temperature 230 ℃.
B1: conductive carbon powder with DBP oil absorption value of 120cm3100g, Conductex 7090, Columbia, conductivity 33S/m;
b2: conductive carbon powder with DBP oil absorption value of 350cm3100g, E350G, Yirui stone, the conductivity is 45S/m;
c1: stainless steel fiber, Becatel, BU8/12000, length 10mm, diameter 7 μm, and electrical conductivity 1.45 × 106S/m；
C2: carbon fiber, PX35CA0250-65, Dongli, length 7mm, diameter 7μ m, conductivity of 4.5 × 104S/m；
D (toughening agent): maleic anhydride grafted POE, commercially available;
e (antioxidant): SONOX1010, commercially available;
f (lubricant): POE, commercially available;
g (mineral filler): talc, commercially available;
examples 1 to 13 and comparative examples 1 to 5
The components and parts by weight of the high-conductivity thermoplastic composite materials of examples 1 to 13 and comparative examples 1 to 5 are selected as shown in tables 1 and 2, wherein the preparation method of the high-conductivity thermoplastic composite materials of examples 1 to 13 and comparative examples 1 to 5 comprises the following steps:
(1) uniformly mixing the thermoplastic resin and the toughening agent to obtain a first mixture (if the formula does not contain the toughening agent, the step is omitted);
(2) uniformly mixing the first mixture, the conductive carbon powder and the conductive fibers to obtain a second mixture;
(3) feeding the second mixture into a double-screw extruder for extrusion granulation, wherein the length-diameter ratio of the double-screw extruder is 48: 1, the processing temperature of PE and PP is 200 ℃, and the processing temperature of PA is 260 ℃.
TABLE 1
Note: in the table, "-" indicates that this component was not added, as follows.
TABLE 2
The materials prepared in examples 1 to 13 and comparative examples 1 to 5 were subjected to performance tests, and the respective performance test methods were as follows:
(1) resistance: the bars were prepared according to the method of ISO 527-2-2012 and the resistance was measured at both ends at a temperature of 25 ℃ using a VICTOR VC9808 multimeter.
(2) Notched impact strength, according to ISO 180, using type A notches.
(3) And (3) testing the electromagnetic shielding performance of the square plate within the frequency of 0.5-2 GHz according to GB/T30142 and 2013 and a flange coaxial device testing method by injection molding the composition into a 150-2 mm square plate.
The specific test results are shown in table 3:
TABLE 3
As can be seen from the comparison between example 7 and comparative examples 1-2, the resistance of the composite material was more than 37.1. omega. and 16 times or more that of example 7 when only one of the conductive fiber and the conductive carbon black was added to the composite material. Furthermore, as can be seen from the comparison between example 7 and comparative examples 3 to 5, when the amount range of the thermoplastic resin, the amount range of the conductive carbon powder, or the amount range of the conductive fiber in the present invention is changed, the obtained composite material has high electrical resistance or is difficult to be molded into a sample with electromagnetic shielding performance (indicating that the processability is poor). This indicates that when the amount range of the component used in the present application is changed, it is difficult to achieve a balance between low resistance and high processability.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The high-conductivity thermoplastic composite material is characterized by comprising the following components in parts by weight: 50-80 parts of thermoplastic resin, 20-55 parts of conductive carbon powder and 0.1-10 parts of conductive fiber;
wherein the conductivity of the conductive fiber is more than 100 times of that of the conductive carbon powder.
2. The high-conductivity thermoplastic composite material according to claim 1, wherein the weight ratio of the conductive carbon powder to the conductive fiber is (20-100): 1.
3. the high-conductivity thermoplastic composite material according to claim 2, wherein the weight of the conductive carbon powder and the conductive fiber is (25-50): 1.
4. the high conductivity thermoplastic composite of any one of claims 1-3, wherein the thermoplastic resin has a melting temperature of 50-400 ℃;
the conductive fiber is metal fiber and/or carbon fiber with conductivity greater than 104S/m。
5. The high conductivity thermoplastic composite as claimed in claim 4, wherein said thermoplastic resin is selected from one or more of PE, PP, ABS, PC, PPE, PA, polyether block polyamide.
6. The high conductivity thermoplastic composite of claim 4, wherein the conductive fibers are selected from one or more of stainless steel fibers, carbon fibers, copper fibers, chromium fibers, gold fibers, silver fibers, tungsten fibers, nickel fibers, and nickel-plated carbon fibers.
7. The high-conductivity thermoplastic composite material as claimed in any one of claims 1 to 3, wherein the conductive carbon powder is conductive carbon black having an oil absorption value of 100-400cm3/100g。
8. The high conductivity thermoplastic composite of any of claims 1-3 further comprising the following components in parts by weight: 0.1-10 parts of an additive;
the additive is one or more of an antioxidant, a toughening agent, a lubricant and a mineral filler.
9. A method of preparing a high conductivity thermoplastic composite as claimed in any one of claims 1 to 8, comprising the steps of:
(1) weighing various raw materials according to a ratio, and uniformly mixing to obtain a mixed material;
(2) adding the mixed material into a double-screw extruder for extrusion granulation to obtain the high-conductivity thermoplastic composite material; wherein, the length-diameter ratio of the double-screw extruder is (30-60): 1, the processing temperature is 120-400 ℃.
10. Use of the high conductivity thermoplastic composite of any of claims 1-8 in automobiles, home appliances, electronic appliances, electromagnetic shielding devices.
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2022
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Patent Citations (6)
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