CN102911446B - Conductive composite material containing carbon nano tubes and preparation method thereof - Google Patents
Conductive composite material containing carbon nano tubes and preparation method thereof Download PDFInfo
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- CN102911446B CN102911446B CN201210442820.7A CN201210442820A CN102911446B CN 102911446 B CN102911446 B CN 102911446B CN 201210442820 A CN201210442820 A CN 201210442820A CN 102911446 B CN102911446 B CN 102911446B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
Abstract
The invention relates to a conductive composite material comprising carbon nano tubes and a preparation method thereof. The conductive composite material containing the carbon nano tubes comprises the following components: carbon nano tubes (CNTs), dispersant polymer and matrix polymer. The method comprises the following steps of: (1) evenly mixing the CNTs with polymer sections serving as a dispersant by mass percent of (5-50):(95-50), and carrying out melt blending, extrusion and granulation by a double-screw extruder to obtain masterbatches, wherein the polymer sections contain benzene rings and nitrile groups; and (2) adding the prepared masterbatches and pure thermoplastic polymer sections into the double-screw extruder in mass ratio of (2-40):(98-60), and then carrying out melt blending and extrusion to obtain the conductive composite material. The preparation process disclosed by the invention has simple process, does not need to perform covalent modification on the CNTs and does not destroy the structure of the CNTs, the CNTs have good dispersibility, and the prepared composite material has high content of CNTs and good conductibility.
Description
Technical field
The present invention relates to conducing composite material of a kind of carbon nanotubes and preparation method thereof, particularly relate to a kind of conductive agglomerate and preparation method thereof of carbon nanotubes and conducing composite material of a kind of carbon nanotubes and preparation method thereof, the polymkeric substance that more specifically relates to contain aromatic ring and itrile group using roughly the same time is prepared the master batch of high content of carbon nanotubes and is utilized this master batch to prepare the method for matrix material by non-covalent method of modifying as polymer dispersant.
Background technology
The unique texture that carbon nanotube (CNTs) has is given its excellent mechanics, electricity and thermal property, and it is with a wide range of applications in improving mechanical properties of polymer and preparing conducing composite material, electrically conductive composite fibre.Therefore, utilize CNTs to prepare conducing composite material and become rapidly study hotspot.
Bai Shulin etc. (Chinese patent ZL 201010175050.5) add CNTs and pure superpolymer in forcing machine simultaneously and prepare CNTs filled conductive thermoplastic polymer primary master batch, and wherein CNTs massfraction is 0.1-20.0%.Then adopt melting to invade profit legal system and fill superpolymer secondary master batch for Stainless Steel Fibre.Finally above-mentioned primary master batch, secondary master batch and the section of pure superpolymer are mixed and be jointly injection molded into conduction high polymer material.Liu Kemei etc. (Chinese patent application publication number CN102399418A) first by metallic aluminium fine powder, carbon nanotube, active bamboo powdered carbon, Activated Sepiolite, silver sulfide according to mass ratio (1-3): 1:(0.5-1.5): (0.4-2): (0.01-1) mix, after grinding, obtain the conductive modified material that particle diameter is not more than 15 μ m, then above-mentioned conductive modified material is joined in polyester fondant, after stirring, extruding pelletization, obtains CNTs massfraction and is 0.35 ~ 13.75% conductive antibacterial polyester masterbatches.Yi Qingfeng etc. (Chinese patent application publication number CN 101870812A) mix CNTs, nano imvite, compatible toughening agents and nylon 66, with Banbury mixer or twin screw extruder, prepare conductive agglomerate, and wherein CNTs massfraction is 10.0 ~ 30.0%.Then by master batch and nylon 66, compatible toughening agents, oxidation inhibitor, nucleator and mix lubricant, through twin screw extruder, extrude and prepare conductive nylon material.
But the unique texture of CNTs has also limited its application when giving the performance of its numerous excellences.CNTs surface has large π key, and defect is few, lacks active group, makes neither hydrophilic also oleophylic not of its surface, is difficult in all kinds of SOLVENTS or polymer melt, disperse and dissolve.In addition, CNTs has large specific surface area, length-to-diameter ratio and stronger Van der Waals force, makes it easily reunite or be wound around.Therefore,, in order to improve the dispersiveness of CNTs in polymkeric substance, conventionally need to carry out covalent modified (Chinese patent: ZL 200610118122.6 to it; Zhao X.D., Lin W.R., Song N.H., et al.J.Mater.Chem., 2006,16:4619-4625; ) or non-covalent modification (Chinese patent: ZL 200810159180).Covalent modified, be often referred to the defect generation chemical reaction utilizing on CNTs surface or terminal position, form specific functional group or connect functional molecular; Non-covalent modification, refers to utilize the water repellent surface on CNTs surface and π-electron structure and other molecule to be combined by weak interactions such as hydrophobic force, π-π are stacking, makes the organic molecule of solubility be wound around or be adsorbed on the surface of CNTs.These two kinds of method of modifying are all widely used in the preparation of the conducing composite material containing CNTs.
Prepare aspect conducing composite material adopting covalent modified method, Qian Qi etc. (Chinese patent ZL 200510024522.6) first carry out nitric acid oxidation in conjunction with ball milling surface treatment to CNTs, then in dimethylbenzene, be mixed to get compound with polyethylene, maleic anhydride grafted polyethylene, coupling agent and oxidation inhibitor, adopt melt blending to prepare the high density masterbatch of anti-static composite material the compound obtaining and terpolymer EP rubber, linking agent, additional crosslinker again, wherein CNTs massfraction is about 2.0 ~ 17.0%.Finally the masterbatch obtaining and common polythene are carried out to melt blending granulation by a certain percentage, obtain CNTs/ polyethylene anti-static composite material.Huang Dehuans etc. (Chinese patent ZL 200710067203.2) first carry out soda acid oxide treatment by CNTs, then be mixed to form reaction mixture with maleic anhydride inoculated polypropylene, through frit reaction, extrude that to prepare CNTs massfraction be 0.1 ~ 20.0% CNTs/PP matrix material.CNTs modifies rear surface through soda acid and can reduce, and is connected with hydroxyl and carboxyl simultaneously, and these groups can react with maleic anhydride and be grafted on PP long-chain, thereby have improved the dispersiveness of CNTs in PP matrix.Xiao Ru etc. (Chinese patent application publication number CN 101864610A) through twin screw extruder melt pelletization, obtain CNTs/ polyolefin master batch by the CNTs after nitration mixture oxide treatment and polyolefine, and wherein CNTs massfraction is 1.0 ~ 10.0%.
Prepare aspect conducing composite material adopting non-covalent method of modifying, Zhou Huanmin etc. (Chinese Patent Application No. CN101870802A) are even by being dried, processing, adding assistant agent to carry out high-speed mixing by fiber-forming polymer (as terylene chips, nylon chips), conductive compositions (carbon black and CNTs), coupling agent and dispersion agent (as montanin wax, polyethylene wax, OP wax, Aluminate), then add in twin screw extruder, extrude tie rod pelletizing and obtain master batch, wherein the massfraction of CNTs is 1.6%.
There is the CNTs content defect such as poor on the low side, dispersed in the conducing composite material method of at present, preparing carbon nanotubes.And in order to improve the content of CNTs in polymeric matrix and to improve its dispersiveness in matrix, conventionally it is carried out to covalency and non-covalent modification.Although the covalent modified controllability of CNTs is good, can destroy its graphite-like structural pipe wall, its electrical property is affected; Non-covalent modification can not destroy the structure of former CNTs, can bring into play better its good characteristic, has higher using value, but the non-covalent method of modifying adopting at present also cannot improve content and the dispersiveness of CNTs in polymeric matrix effectively.Therefore filter out and a kind ofly can the method by non-covalent modification can significantly improve its dispersed polymkeric substance to CNTs,, good dispersity high for preparation CNTs content, technique conducing composite material simple and applied widely are very significant, can greatly simplify the preparation technology of conducing composite material simultaneously and improve the dispersiveness of CNTs in matrix material.
Summary of the invention
The present invention aims to provide a kind of preparation method of polymer masterbatch of high content of carbon nanotubes, and adopts this master batch to prepare the method for conducing composite material.In gained master batch CNTs content high, be uniformly dispersed, and without CNTs being carried out covalent modified and adding coupling agent and tensio-active agent etc., preparation technology is simple simultaneously, cost is low, use range is wide.The conducing composite material that utilizes this master batch to prepare, can be widely used in engineering plastics, rubber, membrane product and filamentary material.
The conductive agglomerate of a kind of carbon nanotubes of the present invention, is the mixture section of CNTs and polymer dispersant, and described CNTs is embedded in described polymer dispersant equably, forms conductive network;
Described CNTs is Single Walled Carbon Nanotube (SWCNT) or multi-walled carbon nano-tubes (MWCNT);
The polymkeric substance of described polymer dispersant for contain phenyl ring and itrile group is simultaneously styrene-acrylonitrile copolymer (SAN resin), Acrylnitrile-Butadiene-Styrene (ABS) or poly (arylene ether nitrile) (PEN).
As preferred technical scheme:
The conductive agglomerate of a kind of carbon nanotubes as above, described CNTs and the mass ratio of polymer dispersant are 5 ~ 50:95 ~ 50.
The conductive agglomerate of a kind of carbon nanotubes as above, described CNTs diameter and length are respectively 0.75 ~ 30nm and 0.1 ~ 50 μ m; The melting index of described polymer dispersant is 2 ~ 10g/10min.
The present invention also provides a kind of preparation method of conductive agglomerate of carbon nanotubes, CNTs is joined in twin screw extruder after mixing 5 ~ 50:95 ~ 50 in mass ratio with polymer dispersant section, after melt blending 6 ~ 20 minutes, extrude and preparation obtains the conductive agglomerate of carbon nanotubes.
The preparation method of the conductive agglomerate of a kind of carbon nanotubes as above, described CNTs is Single Walled Carbon Nanotube (SWCNT) or multi-walled carbon nano-tubes (MWCNT); The polymkeric substance of described polymer dispersant for contain phenyl ring and itrile group is simultaneously styrene-acrylonitrile copolymer (SAN resin), Acrylnitrile-Butadiene-Styrene (ABS) or poly (arylene ether nitrile) (PEN).
The preparation method of the conductive agglomerate of a kind of carbon nanotubes as above, described CNTs diameter and length are respectively 0.75 ~ 30nm and 0.1 ~ 50 μ m; The melting index of described polymer dispersant is 2 ~ 10g/10min; Described melt blending temperature is 185 ~ 315 ℃.
The present invention provides again a kind of conducing composite material of carbon nanotubes, and the conducing composite material of described carbon nanotubes is the mixture of CNTs, polymer dispersant and thermal plasticity high polymer; Described CNTs is embedded in polymer dispersant equably, and is evenly dispersed in thermal plasticity high polymer as conducting medium.
Described CNTs is Single Walled Carbon Nanotube (SWCNT) or multi-walled carbon nano-tubes (MWCNT);
The polymkeric substance of described polymer dispersant for contain phenyl ring and itrile group is simultaneously styrene-acrylonitrile copolymer (SAN resin), Acrylnitrile-Butadiene-Styrene (ABS) or poly (arylene ether nitrile) (PEN);
Described thermal plasticity high polymer is polypropylene (PP), polyethylene (PE), poly(lactic acid) (PLA), polyoxymethylene (POM), polyamide (PA), polyester (PET) or thermoplastic polyurethane (TPU).
The conducing composite material of a kind of carbon nanotubes as above, in the conducing composite material of described carbon nanotubes, the quality sum of described CNTs and described polymer dispersant and the mass ratio of described thermal plasticity high polymer are 2 ~ 40:98 ~ 60, and the content of described CNTs in described conducing composite material is 1 ~ 20wt%; Described CNTs diameter and length are respectively 0.75 ~ 30nm and 0.1 ~ 50 μ m; The melting index of described polymer dispersant is 2 ~ 10g/10min; The melting index of described thermoplastic polymer is 3 ~ 80g/min.
The present invention provides again a kind of preparation method of conducing composite material of carbon nanotubes, comprising:
(1) master batch preparation: CNTs is joined in twin screw extruder after mixing 5 ~ 50:95 ~ 50 in mass ratio with polymer dispersant section, and melt blending is after 6 ~ 20 minutes, extrudes the conductive agglomerate that preparation also obtains carbon nanotubes;
(2) preparation of conducing composite material: the conductive agglomerate of the carbon nanotubes that upper step is prepared and thermoplastic polymer section join in twin screw extruder 2 ~ 40:98 ~ 60 in mass ratio, the content that simultaneously should meet CNTs is 1 ~ 20wt%, and then melt blending is extruded the conducing composite material for preparing carbon nanotubes.
The preparation method of the conducing composite material of a kind of carbon nanotubes as above, in the conducing composite material of described carbon nanotube, described CNTs diameter and length are respectively 0.75 ~ 30nm and 0.1 ~ 50 μ m; The melting index of described polymer dispersant is 2 ~ 5g/10min; The melting index of described thermoplastic polymer is 3 ~ 80g/min; Described melt blending temperature is 185 ~ 315 ℃.
Beneficial effect:
(1) as the phenyl ring in the polymkeric substance of dispersion agent and itrile group, by π-π is stacking, act synergistically with CNTs, can significantly improve the dispersiveness of CNTs, thereby improve the content of CNTs in master batch and matrix material.
(2) covalent modified without CNTs is carried out, can not destroy the structure of CNTs, and without adding the auxiliary agents such as coupling agent, only need can reach the object of improving CNTs dispersing property in polymkeric substance by the method for non-covalent modification.
(3) content of carbon nanotubes of gained master batch is high, and cost is low, applied widely, preparation technology is simple, can be widely used in processing, the moulding of plastics, rubber, film and filamentary material.
(4) preparation technology of gained conducing composite material is simple, and the dispersing property of CNTs in conducing composite material is good, thereby can significantly improve the conductivity of matrix material.
Embodiment
Below in conjunction with embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
Adopt diameter and length is respectively the Single Walled Carbon Nanotube (SWCNT) of 0.75nm and 0.1 μ m, the styrene-acrylonitrile copolymer (SAN) of MFI=4g/10min is prepared conducing composite material as the polypropylene (PP) of polymer dispersant and MFI=3g/min.Preparation process is as follows:
(1) master batch preparation: SWCNTs and the SAN 50:50 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 20 minutes, is extruded also preparation and obtained conductive agglomerate at 195 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the PP 40:60 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 205 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 20wt%, and specific conductivity is 1.2S/cm.
Embodiment 2
Adopt diameter and length is respectively the multi-walled carbon nano-tubes (MWCNT) of 30nm and 50 μ m, the styrene-acrylonitrile copolymer (SAN) of MFI=6g/10min is prepared conducing composite material as the polyoxymethylene (POM) of polymer dispersant and MFI=20g/min.Preparation process is as follows:
(1) master batch preparation: MWCNTs and the SAN 50:50 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 12 minutes, is extruded also preparation and obtained conductive agglomerate at 205 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the POM 2:98 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 215 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 1wt%, and specific conductivity is 3.5 * 10
-4s/cm.
Embodiment 3
Adopt diameter and length is respectively the multi-walled carbon nano-tubes (MWCNT) of 12nm and 3 μ m, the styrene-acrylonitrile copolymer (SAN) of MFI=5g/10min is prepared conducing composite material as the poly(lactic acid) (PLA) of polymer dispersant and MFI=3g/min.Preparation process is as follows:
(1) master batch preparation: MWCNTs and the SAN 25:75 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 10 minutes, is extruded also preparation and obtained conductive agglomerate at 195 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the PLA 40:60 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 215 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 10wt%, and specific conductivity is 0.15S/cm.
Embodiment 4
Adopt diameter and length is respectively the Single Walled Carbon Nanotube (SWCNT) of 5nm and 3 μ m, the Acrylnitrile-Butadiene-Styrene (ABS) of MFI=3.5g/10min is prepared conducing composite material as the polyethylene (PE) of polymer dispersant and MFI=25g/min.Preparation process is as follows:
(1) master batch preparation: SWCNTs and the ABS 40:60 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 15 minutes, is extruded also preparation and obtained conductive agglomerate at 185 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the PE 20:80 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 185 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 8wt%, and specific conductivity is 1.0 * 10
-2s/cm.
Embodiment 5
Adopt diameter and length is respectively the multi-walled carbon nano-tubes (MWCNT) of 9.5nm and 1.5 μ m, the Acrylnitrile-Butadiene-Styrene (ABS) of MFI=2g/10min is prepared conducing composite material as the thermoplastic polyurethane (TPU) of polymer dispersant and MFI=45g/min.Preparation process is as follows:
(1) master batch preparation: MWCNTs and the ABS 30:70 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 10 minutes, is extruded also preparation and obtained conductive agglomerate at 195 ℃;
(2) preparation of conducing composite material: by the conductive agglomerate preparing and TPU in mass ratio 40:60 after mixing, join twin screw extruder melt blending extruding at 205 ℃, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 12wt%, and specific conductivity is 0.35S/cm.
Embodiment 6
Adopt diameter and length is respectively the Single Walled Carbon Nanotube (SWCNT) of 1.5nm and 1 μ m, the Acrylnitrile-Butadiene-Styrene (ABS) of MFI=10g/10min as the nylon 6(PA6 of polymer dispersant and MFI=80g/min) prepare conducing composite material.Preparation process is as follows:
(1) master batch preparation: SWCNTs and the ABS 20:80 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 10 minutes, is extruded also preparation and obtained conductive agglomerate at 220 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the PA6 30:70 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 265 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 6wt%, and specific conductivity is 6.8 * 10
-3s/cm.
Embodiment 7
Adopt diameter and length is respectively the multi-walled carbon nano-tubes (MWCNT) of 9.5nm and 1.5 μ m, the poly (arylene ether nitrile) (PEN) of MFI=8g/10min is prepared conducing composite material as the polyester (PET) of polymer dispersant and MFI=15g/min.Preparation process is as follows:
(1) master batch preparation: MWCNTs and the PEN 5:95 in mass ratio that cuts into slices is joined in twin screw extruder after mixing, and melt blending, after 8 minutes, is extruded also preparation and obtained conductive agglomerate at 315 ℃;
(2) preparation of conducing composite material: the conductive agglomerate preparing and the PET 40:60 that cuts into slices is in mass ratio joined to twin screw extruder melt blending extruding at 315 ℃ after mixing, prepare the conducing composite material of carbon nanotubes.
In the conducing composite material preparing, content of carbon nanotubes is 2wt%, and specific conductivity is 7.6 * 10
-4s/cm.
Claims (5)
1. a conductive agglomerate for carbon nanotubes, is characterized in that: the conductive agglomerate of described carbon nanotubes is the mixture section of CNTs and polymer dispersant, and described CNTs is embedded in described polymer dispersant and forms conductive network;
Described CNTs is Single Walled Carbon Nanotube or multi-walled carbon nano-tubes;
The polymkeric substance of described polymer dispersant for contain phenyl ring and itrile group is simultaneously styrene-acrylonitrile copolymer, Acrylnitrile-Butadiene-Styrene or poly (arylene ether nitrile);
Described CNTs and the mass ratio of polymer dispersant are 5～50:95～50;
Described CNTs diameter and length are respectively 0.75～30nm and 0.1～50 μ m; The melting index of described polymer dispersant is 2～10g/10min.
2. the preparation method of the conductive agglomerate of a kind of carbon nanotubes according to claim 1, it is characterized in that: CNTs is joined in twin screw extruder after mixing 5～50:95～50 in mass ratio with the section of polymer dispersant, after melt blending 6～20 minutes, extrude and preparation obtains the conductive agglomerate of carbon nanotubes;
Described melt blending temperature is 185～315 ℃.
3. a conducing composite material for the carbon nanotubes that the conductive agglomerate of carbon nanotubes according to claim 1 makes, is characterized in that: the conducing composite material of described carbon nanotubes is the mixture of CNTs, polymer dispersant and thermal plasticity high polymer; Described CNTs is embedded in polymer dispersant equably, and is evenly dispersed in thermal plasticity high polymer as conducting medium;
Described CNTs is Single Walled Carbon Nanotube or multi-walled carbon nano-tubes;
The polymkeric substance of described polymer dispersant for contain phenyl ring and itrile group is simultaneously styrene-acrylonitrile copolymer, Acrylnitrile-Butadiene-Styrene or poly (arylene ether nitrile);
Described thermal plasticity high polymer is polypropylene, polyethylene, poly(lactic acid), polyoxymethylene, polymeric amide, polyester or thermoplastic polyurethane;
In the conducing composite material of described carbon nanotubes, the quality sum of described CNTs and described polymer dispersant and the mass ratio of described thermal plasticity high polymer are 2～40:98～60, and the content of described CNTs in described conducing composite material is 1～20wt%; The melting index of described thermal plasticity high polymer is 3～80g/min.
4. the preparation method of the conducing composite material of a kind of carbon nanotubes according to claim 3, is characterized in that comprising:
(1) master batch preparation: CNTs is joined in twin screw extruder after mixing 5～50:95～50 in mass ratio with the section of polymer dispersant, and melt blending is after 6～20 minutes, extrudes the conductive agglomerate that preparation also obtains carbon nanotubes;
(2) preparation of conducing composite material: the conductive agglomerate of the carbon nanotubes that upper step is prepared and the section of thermal plasticity high polymer in mass ratio 2～40:98～60 join in twin screw extruder, the content that simultaneously should meet CNTs is 1～20wt%, and then melt blending is extruded the conducing composite material for preparing carbon nanotubes.
5. the preparation method of the conducing composite material of a kind of carbon nanotubes according to claim 4, is characterized in that, described CNTs diameter and length are respectively 0.75～30nm and 0.1～50 μ m; The melting index of described polymer dispersant is 2～10g/10min; The melting index of described thermal plasticity high polymer is 3～80g/min; Described melt blending temperature is 185～315 ℃.
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