A continuous oriented densification process and apparatus for carbon nanotube aerogels

Abstract

The present application belongs to the field of carbon nanometer material post-processing technology, and particularly relates to a continuous orientation densification treatment method and device for carbon nanometer tube aerogel; the method comprises: (1) electrostatic adsorption treatment of raw materials in the process of roller transmission; (2) directional arrangement of the carbon nanometer tube aerogel subjected to electrostatic adsorption treatment; (3) thermal pressure roller densification of the carbon nanometer tube aerogel subjected to directional arrangement; (4) continuous collection of the carbon nanometer tube aerogel subjected to densification molding through a reel; the device comprises, in sequence along the material conveying direction, a feeding connection unit, an electrostatic adsorption transmission unit, an electric field orientation unit, a thermal pressure roller densification unit and a continuous winding unit. The present application uses carbon nanometer tube aerogel as raw material, realizes continuous transmission without damage through electrostatic adsorption by means of a guide roller, completes accurate orientation of carbon nanometer tube by means of a high-voltage electric field, realizes continuous densification through a thermal pressure roller, and obtains a high-orientation and high-densification carbon nanometer tube film through a reel.

Description

Technical Field

[0001] This invention belongs to the field of carbon nanomaterial post-processing technology, specifically relating to a method and apparatus for continuous orientation densification of carbon nanotube aerogels. Background Technology

[0002] The information in this background section is intended only to enhance some understanding of the overall background of this disclosure and is not necessarily to be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] Floating catalyst chemical vapor deposition is a mature technology for preparing carbon nanotube aerogels, enabling large-scale continuous production. However, the carbon nanotube aerogels obtained by this method have a three-dimensional loose and disordered structure with randomly entangled carbon nanotubes. Direct processing is prone to damage and wrinkles, and the films have low density and poor anisotropy, which cannot meet the performance requirements of high-end applications such as flexible conductivity, electromagnetic shielding, and thermal management.

[0004] In existing technologies, the post-processing of carbon nanotube aerogels often employs an "intermittent stretching and orientation + separate hot pressing" method, which suffers from poor process continuity, insufficient orientation uniformity, and inability to achieve continuous production. Furthermore, the fluffy aerogel is prone to sticking to or tearing during transport, making subsequent orientation and densification processes unstable. A single electric field orientation or hot pressing process is insufficient to simultaneously achieve both the degree of orientation and density of the film, resulting in poor product consistency.

[0005] Therefore, it is urgent to develop a continuous post-processing technology for carbon nanotube aerogels produced by existing mature processes, in order to solve the technical bottlenecks of "unstable transport, disordered orientation, and discontinuous densification" in the post-processing of aerogels, and realize the large-scale and continuous preparation of high-performance carbon nanotube films. Summary of the Invention

[0006] This invention discloses a method and apparatus for continuous orientation and densification of carbon nanotube aerogel. The method uses carbon nanotube aerogel prepared by a mature process as raw material, introduces it through a guide roller, and achieves continuous transport without damage through electrostatic adsorption. Combined with a high-voltage electric field, the carbon nanotubes are precisely oriented. Then, continuous densification is achieved through a thermal pressure roller. Finally, a highly oriented and highly dense carbon nanotube film is obtained by collecting it through a roll. This invention solves the technical bottlenecks of "unstable transport, disordered orientation, and discontinuous densification" in the post-processing of aerogel mentioned in the background technology.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A method for continuous orientation densification of carbon nanotube aerogels, the method using continuous carbon nanotube aerogels prepared by a floatation catalysis method as raw materials, includes the following steps: (1) The raw materials undergo electrostatic adsorption treatment during the roller transfer process; (2) Carbon nanotube aerogels treated with electrostatic adsorption are arranged in an electric field orientation; (3) The directional carbon nanotube aerogel is densified by thermal roller pressing; (4) The densified carbon nanotube aerogel is continuously collected by a roller.

[0008] Preferably, step (1) specifically includes: S1. The raw material carbon nanotube aerogel is introduced into the electrostatic adsorption transfer unit via the guide roller of the feeding connection unit; wherein, the guide roller is set with pretension to avoid damage and excessive relaxation of carbon nanotube aerogel during the transfer process. S2. The electrostatic adsorption and transfer unit applies high-voltage static electricity through an electrostatic generator, causing the fluffy carbon nanotube aerogel to adhere tightly and smoothly to the surface of the insulating high-temperature resistant transfer roller under the action of electrostatic adsorption force, thus achieving continuous conveying without damage, wrinkles, or deviation. Step (2) specifically includes: carbon nanotube aerogel enters the electric field orientation unit with the insulating high-temperature resistant transfer roller. Under the action of the high voltage electric field in the preset direction, the carbon nanotubes in the aerogel are polarized and arranged in an orderly manner along the electric field direction to form a uniformly oriented carbon nanotube network film. Step (3) specifically includes: the carbon nanotube network film enters between the upper and lower hot rollers of the hot roller densification unit. Under the set temperature, pressure and roller gap conditions, it is continuously hot-pressed to achieve film densification. Step (4) specifically includes: the densified carbon nanotube film enters the continuous winding unit. After tension regulation, it is continuously wound by the winding roller under constant tension.

[0009] Preferably, the pretension in S1 is 5-10 N; in S2, the electrostatic adsorption voltage is 5-30 kV, the linear speed of the insulating high-temperature resistant transfer roller is synchronized with the production speed of the external carbon nanotube aerogel, and is controlled at 0.1-5 m / min; in step (2), the high-voltage electric field is a DC electric field or an alternating electric field, the electric field strength is 100-1000 V / m, the electric field direction is parallel to the film conveying direction, and the residence time of the carbon nanotube aerogel in the electric field is 0.5-5 s, ensuring that the carbon nanotubes complete the orientation adjustment in the electric field; in step (3), the surface temperature of the upper and lower hot pressing rollers is 80-300℃, the roller pressure is 0.1-5 MPa, and the roller gap is 10-100 μm.

[0010] In addition, the present invention also discloses a continuous orientation densification treatment device for carbon nanotube aerogels to implement the above method. The device is an integrated post-processing equipment independent of the carbon nanotube aerogel preparation system. Along the material conveying direction, it sequentially includes a feeding connection unit, an electrostatic adsorption transfer unit, an electric field orientation unit, a thermal pressure roller densification unit, and a continuous winding unit.

[0011] Preferably, the feeding connection unit includes a guide roller and a tension pre-adjuster, used to smoothly introduce the carbon nanotube aerogel produced by the external mature process into the subsequent processing unit, matching the aerogel production speed with the device processing speed; the tension pre-adjuster is an adjustable height bracket. According to the material conveying direction, the guide roller includes a first roller body located on the rear side and a second roller body located on the front side. The first roller body is rotatably connected to the first bracket, and the two ends of the central shaft of the second roller body are connected to the adjustable height bracket. The height of the second roller body is adjusted by the adjustable height bracket to achieve the pre-adjustment of the raw material tension.

[0012] Preferably, the electrostatic adsorption and transfer unit includes an electrostatic generator, an adsorption electrode, and an insulating high-temperature resistant transfer roller. The adsorption electrode is attached to the surface of the insulating high-temperature resistant transfer roller and is electrically connected to the electrostatic generator to form a uniform electrostatic field on the roller surface, thereby realizing the adsorption, fixation, and continuous transport of carbon nanotube aerogel. The insulating high-temperature resistant transfer roller is rotatably connected to a second support, and one end of its central shaft is connected to a drive motor.

[0013] Preferably, the electric field orientation unit is disposed on the transport path of the electrostatic adsorption and transfer unit, and consists of one or more pairs of parallel orientation electrodes and a high-voltage DC or alternating power supply. The orientation electrodes are symmetrically distributed on both sides of the carbon nanotube aerogel, the length of the orientation electrodes matches the width of the aerogel, and the electrode spacing is adjusted to form a directional high-voltage electric field, driving the carbon nanotubes to align in an orderly manner.

[0014] Preferably, the thermal pressure roller densification unit includes an upper thermal pressure roller, a lower thermal pressure roller, a pneumatic or hydraulic pressurizing device, and a temperature control device. The upper and lower thermal pressure rollers are arranged in parallel, and a densification channel is formed between the roller surfaces. The upper and lower thermal pressure rollers are equipped with a temperature control device with a temperature control accuracy of ±1℃, which is used for continuous thermal pressing densification of the oriented carbon nanotube network film.

[0015] Preferably, the continuous winding unit includes a tension detection sensor and a winding roller. The winding roller is rotatably connected to the third support, and a drive motor is connected to one end of its central shaft. The tension detection sensor monitors the film tension in real time, and the tension data is transmitted to the controller of the device. The controller adjusts the rotation speed of the winding roller and the insulating high-temperature resistant transfer roller in conjunction with the tension data to achieve constant tension continuous winding of the carbon nanotube aerogel film.

[0016] Preferably, the surface roughness Ra of the insulating high-temperature resistant transfer roller is ≤0.8μm, and the material is polytetrafluoroethylene or ceramic. The orientation electrode of the electric field orientation unit is made of stainless steel or graphite, and the surface is insulated to release the electric field only to the aerogel region, preventing electric field leakage from affecting other units.

[0017] The beneficial effects of the continuous orientation densification treatment method and apparatus for carbon nanotube aerogels of the present invention are as follows: This invention employs an electrostatic adsorption conveying mechanism to replace the traditional roller contact conveying method. Compared to conventional roller conveying, this solution uses electrostatic force to perform non-contact and stable traction on the aerogel film, effectively avoiding the collapse of the aerogel skeleton and edge damage caused by roller friction and compression. It is suitable for the needs of continuous production lines for high flatness and defect-free materials.

[0018] The "electric field orientation + hot pressing densification" synergistic processing technology proposed in this invention achieves precise control of the microstructure compared to simple hot pressing. The combination of the dual effects of thermal and force fields makes the internal pore structure of the aerogel more uniform and the packing more compact, effectively improving the density and mechanical strength of the material, laying the foundation for subsequent extreme environment applications.

[0019] This invention constructs a continuous orientation densification process and apparatus, from electrostatic adsorption and orientation control to hot pressing densification. It directly connects to the existing mature carbon nanotube aerogel preparation process without modifying the pre-production system. It solves the pain points of traditional intermittent processes, such as cumbersome procedures, long waiting time, and poor batch consistency. It also reduces energy consumption and labor costs caused by material transfer and equipment start-up and shutdown, and has great potential for large-scale industrial production. Attached Figure Description

[0020] Figure 1 A flowchart of a continuous orientation densification process for carbon nanotube aerogels; Figure 2 A schematic diagram of a continuous orientation densification device for carbon nanotube aerogel. Reference numerals: 1-Feeding connection unit; 2-Electrostatic adsorption transfer unit; 3-Electric field orientation unit; 4-Thermal pressure roller densification unit; 5-Continuous winding unit; 6-Guide roller; 7-Tension pre-adjuster; 8-Electrostatic generator; 9-Adsorption electrode; 10-Insulated high-temperature resistant transfer roller; 11-Orientation electrode; 12-High voltage DC or AC power supply; 13-Upper hot pressure roller; 14-Lower hot pressure roller; 15-Pneumatic or hydraulic pressurizing device; 16-Temperature control device; 17-Tension detection sensor; 18-Wound roller. Detailed Implementation

[0021] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0022] The following embodiments can be understood as illustrating a part of the structure or method of the present invention individually, or as combining the embodiments to explain the broader structure or method of the present invention.

[0023] Example 1: A method for continuous orientation densification of carbon nanotube aerogels, such as Figure 1 As shown, the method uses continuous carbon nanotube aerogel prepared by a planar catalytic method as raw material, and includes the following steps: (1) The raw materials undergo electrostatic adsorption treatment during the roller transfer process; (2) Carbon nanotube aerogels treated with electrostatic adsorption are arranged in an electric field orientation; (3) The directional carbon nanotube aerogel is densified by thermal roller pressing; (4) The densified carbon nanotube aerogel is continuously collected by a roller.

[0024] Example 2: Based on Example 1, such as Figure 2 As shown, step (1) specifically includes: S1. The raw material carbon nanotube aerogel is introduced into the electrostatic adsorption transfer unit 2 via the guide roller 6 of the feeding connection unit 1; wherein, the guide roller 6 is set with pretension to avoid damage and excessive relaxation of the carbon nanotube aerogel during the transfer process. S2. The electrostatic adsorption and transfer unit 2 applies high voltage static electricity through the electrostatic generator 8, so that the fluffy carbon nanotube aerogel adheres tightly and smoothly to the surface of the insulating high-temperature resistant transfer roller 10 under the action of electrostatic adsorption force, so as to achieve continuous conveying without damage, wrinkles, or deviation.

[0025] Example 3: Based on Example 2, such as Figure 2 As shown, step (2) specifically includes: carbon nanotube aerogel enters the electric field orientation unit 3 along with the insulating high-temperature resistant transfer roller 10. Under the action of the high voltage electric field in the preset direction, the carbon nanotubes in the aerogel are polarized and arranged in an orderly manner along the electric field direction to form a uniformly oriented carbon nanotube network film.

[0026] Example 4: Based on Example 3, such as Figure 2As shown, step (3) specifically includes: the carbon nanotube network film enters between the upper hot roller 13 and the lower hot roller 14 of the hot roller densification unit 4, and is subjected to continuous hot pressing under the set temperature, pressure and roller gap conditions to quickly eliminate the three-dimensional pores of the aerogel, improve the bonding strength between carbon nanotubes, and realize the densification of the film.

[0027] Example 5: Based on Example 4, such as Figure 2 As shown, step (4) specifically includes: the densified carbon nanotube film enters the continuous winding unit 5, and after tension regulation, it is continuously wound by the winding roller 18 under constant tension to obtain a finished carbon nanotube film with high orientation and high density.

[0028] Example 6: Based on the above embodiments, this embodiment discloses: The pretension in S1 is 5-10 N.

[0029] In S2, the electrostatic adsorption voltage is 5-30 kV, and the linear speed of the insulating high-temperature resistant transfer roller is synchronized with the production speed of the external carbon nanotube aerogel, controlled at 0.1-5 m / min to ensure no stretching deformation.

[0030] Preferably, in step (2), the high-voltage electric field is a DC electric field or an alternating electric field with an electric field strength of 100-1000 V / m. The direction of the electric field is parallel to the direction of film transport, and the residence time of the carbon nanotube aerogel in the electric field is 0.5-5 s, ensuring that the carbon nanotubes complete the orientation adjustment in the electric field.

[0031] In step (3), the surface temperature of the upper and lower hot pressure rollers is 80-300℃, the pressure of the rollers is 0.1-5 MPa, and the gap between the rollers is 10-100μm.

[0032] Example 7: This invention also discloses a continuous orientation densification treatment apparatus for carbon nanotube aerogels to implement the above method, such as... Figure 2 As shown, the device is an integrated post-processing equipment independent of the carbon nanotube aerogel preparation system. Along the material conveying direction, it includes, in sequence, a feeding connection unit 1, an electrostatic adsorption and transfer unit 2, an electric field orientation unit 3, a thermal pressure roller densification unit 4, and a continuous winding unit 5.

[0033] Specifically, the feeding connection unit 1 includes a guide roller 6 and a tension pre-adjuster 7, used to smoothly introduce the carbon nanotube aerogel produced by the external mature process into the subsequent processing unit, matching the aerogel production speed with the device processing speed; the tension pre-adjuster 7 is an adjustable height bracket. According to the material conveying direction, the guide roller 6 includes a first roller body located on the rear side and a second roller body located on the front side. The first roller body is rotatably connected to the first bracket, and the two ends of the central shaft of the second roller body are connected to the adjustable height bracket. The height of the second roller body is adjusted by the adjustable height bracket to achieve the pre-adjustment of the raw material tension; the pre-tension is determined according to the toughness of the raw material itself, so that the raw material is not excessively relaxed or damaged due to excessive tension during the conveying process.

[0034] Specifically, the electrostatic adsorption and transfer unit 2 includes an electrostatic generator 8, an adsorption electrode 9, and an insulating high-temperature resistant transfer roller 10. The adsorption electrode 9 is attached to the surface of the insulating high-temperature resistant transfer roller 10 and is electrically connected to the electrostatic generator 8. It is used to form a uniform electrostatic field on the roller surface to realize the adsorption, fixation, and continuous transport of carbon nanotube aerogel. The insulating high-temperature resistant transfer roller 10 is rotatably connected to the second support, and one end of its central shaft is connected to a drive motor.

[0035] Specifically, the electric field orientation unit 3 is disposed on the transport path of the electrostatic adsorption and transfer unit 2, and consists of one or more pairs of parallel orientation electrodes 11 and a high-voltage DC or alternating power supply 12 (the high-voltage DC or alternating power supply 12 is electrically connected to the orientation electrodes 11). The orientation electrodes 11 are symmetrically distributed on both sides of the carbon nanotube aerogel, and the length of the orientation electrodes 11 matches the width of the aerogel. After the electrode spacing is adjusted, a directional high-voltage electric field is formed, which drives the carbon nanotubes to arrange in an orderly manner.

[0036] Specifically, the thermal pressure roller densification unit 4 includes an upper thermal pressure roller 13, a lower thermal pressure roller 14, a pneumatic or hydraulic pressurizing device 15, and a temperature control device 16. The upper and lower thermal pressure rollers are arranged in parallel, forming a densification channel between their roller surfaces. The upper and lower thermal pressure rollers are equipped with a temperature control device 15 with a temperature control accuracy of ±1℃, used for continuous hot pressing densification of the oriented carbon nanotube network film. The pneumatic or hydraulic pressurizing device 15 can be a cylinder or hydraulic cylinder connected between the same side ends of the central shaft of the upper and lower thermal pressure rollers. The gap between the upper and lower thermal pressure rollers can be adjusted by the extension and retraction of the cylinder or hydraulic cylinder, and the pressure of the oriented carbon nanotube network film can be adjusted. The temperature control device 16 typically includes a heating device for heating the surface of the upper and lower thermal pressure rollers and a temperature controller for controlling the heating device. The heating device can be a heating rod that surrounds the central shaft of the upper or lower thermal pressure roller and is embedded below the surface of the upper or lower thermal pressure roller. The temperature controller is electrically connected to the heating rod and used to control the heating power. The upper and lower hot press rollers of the present invention can be products of existing technology, and the internal temperature control device and the external pneumatic or hydraulic pressurization device can be selected from existing technologies.

[0037] Specifically, the continuous winding unit 5 includes a tension detection sensor 17 and a winding roller 18. The winding roller 18 is rotatably connected to the third support, and a drive motor is connected to one end of its central shaft. The tension detection sensor 17 monitors the film tension in real time, and the tension data is transmitted to the controller of the device. The controller adjusts the rotation speed of the winding roller 18 and the insulating high-temperature resistant transfer roller 10 in conjunction with the tension data to achieve constant tension continuous winding of the carbon nanotube aerogel film.

[0038] Example 8: Based on Example 7, such as Figure 2 As shown, the surface roughness Ra of the insulating high-temperature resistant transfer roller 10 is ≤0.8μm, and the material is polytetrafluoroethylene or ceramic, which combines insulation, high temperature resistance and anti-adhesion properties to avoid damage or residue of carbon nanotube aerogel. The orientation electrode of the electric field orientation unit is made of stainless steel or graphite, and the surface is insulated to release the electric field only to the aerogel area, preventing electric field leakage from affecting other units.

[0039] Example 9: S1. Carbon nanotube aerogels prepared by floating catalyst chemical vapor deposition are introduced into the processing device by setting a pretension of 5 N and guiding rollers. S2. The carbon nanotube aerogel introduced by the guide roller is transferred to the electrostatic adsorption transfer unit. A 20 kV voltage is applied by the electrostatic generator. The linear speed of the insulating and high-temperature resistant transfer roller is 2 m / min. Under the action of electrostatic adsorption force, the fluffy carbon nanotube aerogel is tightly and flatly attached to the surface of the transfer roller shaft, so as to achieve continuous conveying without damage, wrinkles, or deviation. S3. Turn on the alternating high voltage power supply, set the electric field strength to 500 V / m, and the electric field direction is perpendicular to the delivery direction. The residence time of the carbon nanotube aerogel in the electric field is 0.8 s. Through the electric field orientation effect, a uniformly oriented carbon nanotube network film is formed. S4. The oriented carbon nanotube network film enters the hot press roller densification unit. The hot press roller temperature is set to 200℃, the roller pressure is 1 MPa, and the roller gap is 20 μm. Continuous hot pressing is performed to quickly eliminate the three-dimensional pores of the aerogel, improve the bonding strength between carbon nanotubes, and achieve film densification. S5. Set the tension to 6 N. After tension adjustment, the densified carbon nanotube film is continuously wound up by a take-up roller under constant tension to obtain a finished carbon nanotube film with high orientation and high density.

[0040] Example 10: S1. Carbon nanotube aerogels prepared by floating catalyst chemical vapor deposition are introduced into the processing device by setting a pretension of 8 N and guiding rollers. S2. The carbon nanotube aerogel introduced by the guide roller is transferred to the electrostatic adsorption transfer unit. A 50 kV electrostatic voltage is applied by the electrostatic generator. The linear speed of the insulating and high-temperature resistant transfer roller is 5 m / min. Under the action of electrostatic adsorption force, the fluffy carbon nanotube aerogel is tightly and flatly attached to the surface of the transfer roller shaft, realizing continuous conveying without damage, wrinkles, or deviation. S3. Turn on the alternating high voltage power supply, set the electric field strength to 1000 V / m, and the electric field direction is perpendicular to the delivery direction. The residence time of the carbon nanotube aerogel in the electric field is 0.6 s. Through the electric field orientation effect, a uniformly oriented carbon nanotube network film is formed. S4. The oriented carbon nanotube network film is fed into the hot press roller densification unit by the transfer roller shaft. The temperature of the upper and lower hot press rollers is set to 250 ℃, the roller pressure is 2 MPa, and the roller gap is 10 μm. Continuous hot pressing is carried out to quickly eliminate the three-dimensional pores of the aerogel, improve the bonding strength between carbon nanotubes, and realize the densification of the film. S5. Set the tension to 8 N. After tension adjustment, the densified carbon nanotube film is continuously wound up by a take-up roller under constant tension to obtain a finished carbon nanotube film with high orientation and high density.

[0041] The above embodiments are preferred embodiments of this disclosure, but the embodiments of this disclosure are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this disclosure shall be considered equivalent substitutions and shall be included within the protection scope of this disclosure.

Claims

1. A method for continuous orientation densification of carbon nanotube aerogels, characterized in that, The method uses continuous carbon nanotube aerogels prepared by a planar catalytic method as raw materials, and includes the following steps: (1) The raw materials undergo electrostatic adsorption treatment during the roller transfer process; (2) Carbon nanotube aerogels treated with electrostatic adsorption are arranged in an electric field orientation; (3) The directional carbon nanotube aerogel is densified by thermal roller pressing; (4) The densified carbon nanotube aerogel is continuously collected by a roller.

2. The method for continuous orientation densification of carbon nanotube aerogel as described in claim 1, characterized in that, Step (1) specifically includes: S1. The raw material carbon nanotube aerogel is introduced into the electrostatic adsorption transfer unit via the guide roller of the feeding connection unit; wherein, the guide roller is set with pretension to avoid damage and excessive relaxation of carbon nanotube aerogel during the transfer process. S2. The electrostatic adsorption and transfer unit applies high-voltage static electricity through an electrostatic generator, causing the fluffy carbon nanotube aerogel to adhere tightly and smoothly to the surface of the insulating high-temperature resistant transfer roller under the action of electrostatic adsorption force, thus achieving continuous conveying without damage, wrinkles, or deviation. Step (2) specifically includes: carbon nanotube aerogel enters the electric field orientation unit with the insulating high-temperature resistant transfer roller. Under the action of the high voltage electric field in the preset direction, the carbon nanotubes in the aerogel are polarized and arranged in an orderly manner along the electric field direction to form a uniformly oriented carbon nanotube network film. Step (3) specifically includes: the carbon nanotube network film enters between the upper and lower hot rollers of the hot roller densification unit. Under the set temperature, pressure and roller gap conditions, it is continuously hot-pressed to achieve film densification. Step (4) specifically includes: the densified carbon nanotube film enters the continuous winding unit. After tension regulation, it is continuously wound by the winding roller under constant tension.

3. The method for continuous orientation densification of carbon nanotube aerogel as described in claim 2, characterized in that, The pretension in S1 is 5-10 N; in S2, the electrostatic adsorption voltage is 5-30 kV, the linear speed of the insulating high-temperature transfer roller is synchronized with the production speed of the external carbon nanotube aerogel, and is controlled at 0.1-5 m / min; in step (2), the high-voltage electric field is a DC electric field or an alternating electric field, the electric field strength is 100-1000 V / m, the electric field direction is parallel to the film conveying direction, and the residence time of the carbon nanotube aerogel in the electric field is 0.5-5 s, ensuring that the carbon nanotubes complete the orientation adjustment in the electric field; in step (3), the surface temperature of the upper and lower hot pressing rollers is 80-300℃, the roller pressure is 0.1-5 MPa, and the roller gap is 10-100 μm.

4. A continuous orientation and densification treatment device for carbon nanotube aerogels, characterized in that, The device is used to implement the method described in any one of claims 1-3, and along the material conveying direction, it sequentially includes a feeding connection unit, an electrostatic adsorption and transfer unit, an electric field orientation unit, a thermal pressure roller densification unit, and a continuous winding unit.

5. The continuous orientation and densification treatment apparatus for carbon nanotube aerogel as described in claim 4, characterized in that, The feeding connection unit includes a guide roller and a tension pre-adjuster; the tension pre-adjuster is an adjustable height bracket. According to the material conveying direction, the guide roller includes a first roller body located on the rear side and a second roller body located on the front side. The first roller body is rotatably connected to the first bracket, and the two ends of the central shaft of the second roller body are connected to the adjustable height bracket. The height of the second roller body is adjusted by the adjustable height bracket to achieve the pre-adjustment of the raw material tension.

6. The continuous orientation and densification apparatus for carbon nanotube aerogel as described in claim 5, characterized in that, The electrostatic adsorption transfer unit includes an electrostatic generator, an adsorption electrode, and an insulating high-temperature resistant transfer roller. The adsorption electrode is attached to the surface of the insulating high-temperature resistant transfer roller and is electrically connected to the electrostatic generator. The insulating high-temperature resistant transfer roller is rotatably connected to a second support, and one end of its central shaft is connected to a drive motor.

7. The continuous orientation and densification apparatus for carbon nanotube aerogel as described in claim 6, characterized in that, The electric field orientation unit is set on the transport path of the electrostatic adsorption and transfer unit and consists of one or more pairs of parallel orientation electrodes and a high-voltage DC or alternating power supply. The orientation electrodes are symmetrically distributed on both sides of the carbon nanotube aerogel, and the length of the orientation electrodes matches the width of the aerogel. After the electrode spacing is adjusted, a directional high-voltage electric field is formed.

8. The continuous orientation and densification apparatus for carbon nanotube aerogel as described in claim 7, characterized in that, The aforementioned hot press roller densification unit includes an upper hot press roller, a lower hot press roller, a pneumatic or hydraulic pressurizing device, and a temperature control device. The upper and lower hot press rollers are arranged in parallel, and a densification channel is formed between the surfaces of the two rollers. The upper and lower hot press rollers are equipped with a temperature control device with a temperature control accuracy of ±1℃, which is used for continuous hot pressing densification of oriented carbon nanotube network films.

9. The continuous orientation and densification apparatus for carbon nanotube aerogel as described in claim 8, characterized in that, The continuous winding unit includes a tension detection sensor and a winding roller. The winding roller is rotatably connected to a third support, and a drive motor is connected to one end of its central shaft. The tension detection sensor monitors the film tension in real time, and the tension data is transmitted to the controller of the device. The controller adjusts the rotation speed of the winding roller and the insulating high-temperature resistant transfer roller in conjunction with the tension data to achieve constant tension continuous winding of the carbon nanotube aerogel film.

10. The continuous orientation and densification apparatus for carbon nanotube aerogel as described in claim 9, characterized in that, The surface roughness Ra of the insulating high-temperature resistant transfer roller is ≤0.8μm, and the material is polytetrafluoroethylene or ceramic. The orientation electrode of the electric field orientation unit is made of stainless steel or graphite, and the surface is insulated so that the electric field is released only to the aerogel region.

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