CN115536008A - Miniature serialization carbon nanotube gaseous phase dispersion equipment - Google Patents
Miniature serialization carbon nanotube gaseous phase dispersion equipment Download PDFInfo
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- CN115536008A CN115536008A CN202211125926.4A CN202211125926A CN115536008A CN 115536008 A CN115536008 A CN 115536008A CN 202211125926 A CN202211125926 A CN 202211125926A CN 115536008 A CN115536008 A CN 115536008A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 50
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 50
- 239000006185 dispersion Substances 0.000 title claims abstract description 17
- 239000007792 gaseous phase Substances 0.000 title 1
- 239000002184 metal Substances 0.000 claims abstract description 74
- 239000007789 gas Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000002086 nanomaterial Substances 0.000 abstract description 2
- 238000005054 agglomeration Methods 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 description 9
- 230000037431 insertion Effects 0.000 description 9
- 239000012071 phase Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012808 vapor phase Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 210000002381 plasma Anatomy 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to the technical field of nano material processing machinery, and discloses a miniature continuous carbon nano tube gas phase dispersing device which comprises a feeding system, a negative pressure system and a dispersing system. The feeding system is a tubular component, one side of the feeding system is connected with a driving motor and forms a fixed object of the driving motor, and the other side of the feeding system is connected with a negative pressure system. The negative pressure system comprises a filter tube and an outer sleeve, the other side of the negative pressure system is connected with the dispersion system, and the negative pressure system is connected with the negative electrode of the power supply. The dispensing system includes a base and a detachable head in a configuration that relies on a metal nozzle in interference fit with a central opening in an insulating support. The compressed air is uniformly sprayed out of the metal nozzle in a ring shape, and the sprayed gas forms an annular gas curtain to rapidly carry away the carbon nano tubes in the dispersion area, so that the formation of the carbon nano tubes in the dispersion gas phase space is increased, and the adhesion of the carbon nano tubes on the surface of the insulating part is reduced. Solves the problem that the carbon nano tube agglomeration is not easy to disperse in the current market.
Description
Technical Field
The invention relates to a miniature continuous carbon nano tube gas phase dispersing device, belonging to the technical field of nano material processing machinery.
Background
Carbon nanotubes have excellent properties such as force, light, heat, electricity, etc., and have a wide application space in many fields. However, carbon nanotubes have a large specific surface area, are easily agglomerated and not easily dispersed under the van der waals force and hooking and winding effects, and bring great inconvenience and performance loss to downstream applications.
In order to solve the above problems, the prior art realizes the opening treatment of the carbon nanotubes by ultrasound, ball milling, high shear, etc.
In recent years, a class of carbon nanotubes excited by the thermal action of plasma discharge has been used to disperse the gas phase of carbon nanotubes.
The patent ZL201610494447.8 discloses a carbon nanotube dispersion method, which comprises preparing a carbon nanotube mixture of carbon nanotubes and binder at a certain ratio. Then the carbon nano tube mixture is pressed to be made into strip electrodes, and the made carbon nano tube mixture electrodes are connected with a power supply. The power supply is switched on, so that current with enough intensity is generated in the carbon nano tube mixture electrode, and the adhesive in the carbon nano tube mixture is quickly vaporized by utilizing the heat effect of the current in the electrode, so that the dispersion effect on the carbon nano tubes is generated.
The invention patent ZL201510963821.X discloses a carbon nanotube dispersing method, which comprises the following steps: (1) mixing carbon nanotubes with a binder; (2) pressing the mixture into an electrode; (3) The electrode is connected with the negative electrode of a direct current power supply, and a metal material and the like are used as the positive electrode of the power supply; (4) keeping a certain distance between the positive electrode and the negative electrode of the power supply; (5) The power supply is switched on, so that electric arcs, plasmas, electric sparks and other electric heating sources with certain intensity are generated between the two electrodes of the circuit, and the adhesive absorbed by the carbon nano tubes is subjected to phase change under the action of high temperature, so that the carbon nano tubes are effectively dispersed.
However, in view of the published technologies, the technologies lack specialized implementation equipment which can be continuous, and form an application bottleneck of the related technologies.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a micro continuous carbon nanotube vapor phase dispersing apparatus, which can realize continuous carbon nanotube vapor phase dispersion in a small space.
In order to achieve the purpose, the invention adopts the technical scheme that:
a micro continuous carbon nano tube gas phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, wherein the three systems are connected in sequence.
The feeding system is a tubular component, one side of the feeding system is connected with a driving motor and forms a fixed object of the driving motor, and the other side of the feeding system is connected with a negative pressure system. The output shaft of the driving motor is connected with a screw rod, the screw rod axially passes through the inner cavity of the tubular part and can rotate in the inner cavity without resistance under the driving of the driving motor, and the major diameter of the screw rod is 0.01-2 mm smaller than the diameter of the inner cavity. The tubular component is provided with a feeding port and a discharging port, the feeding port and the discharging port penetrate through the single-side pipe wall of the tubular component along the radial direction, the feeding port and the discharging port can be respectively arranged forwards and backwards along the axial direction of the tubular component or arranged along the radial direction of the tubular component, and the minimum distance between the feeding port and the discharging port and the inner cavity of the tubular component is larger than 2mm. The feed port and the discharge port respectively feed and discharge the carbon nanotube slurry, the feed amount of the feed port is larger than the discharge amount of the discharge port, and the feed amount of the feed port is not lower than 3ml/min.
The negative pressure system comprises a filter tube and an outer sleeve and is characterized in that one side of the negative pressure system is connected with the feeding system, the other side of the negative pressure system is connected with the dispersion system, and the negative pressure system is connected with the negative electrode of the power supply. The inner cavity of the outer sleeve comprises filter tubes which are coaxially arranged, the outer diameter of each filter tube is 0.5-10 mm smaller than the inner diameter of the outer sleeve, the screw rod axially passes through the inner cavity of each filter tube and can rotate without frictional resistance, the major diameter of the screw rod is 0.01-2 mm smaller than the diameter of the inner cavity of each filter tube, and the screw thread direction and the motor shaft rotating direction of the screw rod enable the screw rod to push materials to one side far away from the driving motor. One side of the sleeve is provided with a water outlet hole, the water outlet hole is connected with negative pressure, and the pressure is less than 0.09MPa. The precision of the filter tube is enough to allow water to pass but not to pass through the carbon nano tube, and is preferably 0.01-100 mu m. The filter tube precision, the filter tube length and the negative pressure of the negative pressure system meet the following requirements: in operation, the moisture in the carbon nanotube slurry is partially separated, and the moisture content in the obtained carbon nanotube slurry after moisture separation is less than 90%.
The dispersing system comprises a base and a separable machine head, wherein the base comprises a metal nozzle and an insulating support, the metal nozzle is positioned in the insulating support and is coaxial with the insulating support, one side of the metal nozzle is connected to the filter tube and is coaxial with the filter tube, the inner diameter of the metal nozzle is as large as the inner diameter of the filter tube, or the inner diameter of the metal nozzle is slightly larger than the inner diameter of the filter tube, but the diameter difference is less than 5mm. The insulating support is provided with a metal insertion tube, the metal insertion tube and the metal nozzle are insulated and isolated by more than 1.5mm, one end of the metal insertion tube is connected with the anode of a power supply, and the other end of the metal insertion tube is exposed. The insulating support is provided with a high-pressure gas circuit, one end of the gas circuit is connected with a high-pressure gas source, and the other end of the gas circuit is positioned on a plane on one side of the insulating support. The high-pressure gas source can be compressed air or other inert gases, and the pressure of the high-pressure gas source acting on the high-pressure gas circuit is 0.1-10 MPa.
The separable handpiece comprises a handpiece insulating support, a metal contact pin, a gas distribution ring, a gas equalization ring, a metal discharging net and a gas guide pipe, can be connected with the base in a pluggable manner, and is in interference fit with the central hole of the insulating support by virtue of a metal nozzle. The gas distribution ring with the diameter larger than that of the opening is arranged on one side of the central opening of the insulating support, the gas distribution ring is attached to one side of the gas distribution ring and made of PP sintering materials, and the central opening is in interference fit with the metal nozzle. One end of the air duct is connected with the air distribution ring, and the other end of the air duct is positioned on one side of the insulating bracket, which is close to the base. One side of the gas-distributing ring is attached to the other side of the gas-distributing ring, and a metal discharging net is attached to the other side of the gas-distributing ring and connected with a metal contact pin.
The connection relationship when the detachable handpiece is inserted into the base is as follows: the metal inserting needle is inserted into the metal inserting tube, the air guide tube is coaxially connected with the air passage, the metal nozzle is inserted into and crosses the air equalizing ring, and the distance between the metal nozzle and the metal discharging net is kept between 1 mm and 5mm.
The power supply is a direct current power supply, and the voltage is 2000-25000V.
The invention has the beneficial effects that the miniature continuous carbon nanotube gas phase dispersing equipment is provided, common carbon nanotube slurry can be remotely and flexibly conveyed, the continuous, stable and controllable gas phase dispersion can be carried out on the carbon nanotubes in the slurry on the basis, and large-space equipment such as slurry storage, conveying power and the like can be separated from the dispersing equipment, so that the space of a dispersing site is greatly saved.
Drawings
FIG. 1 is a schematic structural diagram of a micro continuous carbon nanotube vapor phase dispersing apparatus according to the present invention
In the figure: 1. the gas discharge device comprises a driving motor, 2. An output shaft, 3. A screw rod, 4. A material inlet and a material outlet, 5. A filter tube, 6. An outer sleeve, 7. A water outlet hole, 8. A separable machine head, 9. A metal nozzle, 10. An insulating support, 11. A metal insertion tube, 12. An insulating support of the machine head, 13. A metal insertion pin, 14. A gas distribution ring, 15. A gas homogenizing ring, 16. A metal discharge net and 17. A gas guide tube.
Detailed Description
The invention is further described in the following with reference to the accompanying drawings:
a micro continuous carbon nano tube gas phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, wherein the three systems are connected in sequence.
The feeding system is a tubular component, one side of the feeding system is connected with a driving motor (1) and forms a fixed object of the driving motor (1), and the other side of the feeding system is connected with a negative pressure system. The driving motor (1) and the output shaft (2) are connected with a screw rod (3), the screw rod (3) axially passes through an inner cavity of the tubular component and can rotate in the inner cavity without resistance under the driving of the driving motor (1), the major diameter of the screw rod (3) is smaller than the diameter of the inner cavity by 0.5mm, and the thread direction of the screw rod (3) and the rotation direction of a motor shaft meet the requirement that the screw rod (3) pushes materials to one side far away from the driving motor (1). The tubular component is provided with a feed port and a discharge port (4), the feed port and the discharge port (4) penetrate through the single-side pipe wall of the tubular component along the radial direction, the feed port and the discharge port (4) are respectively arranged in the front and back directions along the axial direction of the tubular component, and the feed port and the discharge port (4) are parallel and have a distance of 4mm.
The negative pressure system comprises a filter tube (5) and an outer sleeve (6), and is characterized in that one side of the negative pressure system is connected with the feeding system, the other side of the negative pressure system is connected with the dispersion system, and the negative pressure system is connected with the negative pole of the power supply. The inner cavity of the outer sleeve (6) contains the filter tubes (5) and is coaxially arranged, the outer diameter of each filter tube (5) is smaller than the inner diameter of the outer sleeve (6) by 2mm, the screw rod (3) axially passes through the inner cavity of each filter tube (5) and can rotate without friction resistance, and the major diameter of the screw rod (3) is smaller than the diameter imm of the inner cavity of each filter tube (5). One side of the sleeve is provided with a water outlet hole (7), and the water outlet hole (7) is connected with negative pressure, and the negative pressure is 0.04MPa. The precision of the filter tube (5) is 30 mu m.
The dispersion system comprises a base and a separable machine head (8), wherein the base comprises a metal nozzle (9) and an insulating support (10), the metal nozzle (9) is positioned inside the insulating support (10) and is coaxial with the insulating support (10), one side of the metal nozzle (9) is connected to the filter tube (5) and is coaxial with the filter tube (5), and the inner diameter of the metal nozzle (9) is equal to that of the filter tube (5). The insulating support (10) is provided with a metal insertion tube (11), and the metal insertion tube (11) is axially parallel to the metal nozzle (9) and has a distance of 2mm. One end of the metal insertion tube (11) is connected with the anode of a power supply, and the other end is exposed. The insulating support (10) is provided with a high-pressure air path, one end of the air path is connected with a high-pressure air source, and the other end of the air path is positioned on a plane on one side of the insulating support (10). The high-pressure air source is compressed air with the pressure of 0.2MPa.
The separable handpiece (8) comprises a handpiece insulating support (12), a metal contact pin (13), an air distribution ring (14), an air equalization ring (15), a metal discharging net (16) and an air duct (17), the separable handpiece (8) can be connected with the base in a pluggable mode, and the separable handpiece (8) is in interference fit with a central hole of the insulating support (10) through a metal nozzle (9). One side of a central opening of the insulating support (10) is provided with a gas distribution ring (14) with the diameter larger than that of the opening, one side of the gas distribution ring (14) is attached with a gas equalization ring (15), the gas equalization ring (15) is made of PP sintering materials, and the central opening is in interference fit with the metal nozzle (9). One end of the air duct (17) is connected with the air distribution ring (14), and the other end is positioned at one side of the insulating bracket (10) close to the base. One side of the gas-equalizing ring (15) is tightly attached to the gas distribution ring (14), and the other side of the gas-equalizing ring is attached to a metal discharging net (16), wherein the metal discharging net (16) is connected with a metal contact pin (13).
When the separable head (8) is inserted into the base, the connection relationship is as follows: the metal inserting needle (13) is inserted into the metal inserting tube (11), the air guide tube (17) is coaxially connected with the air path, the metal nozzle (9) is inserted into and crosses the air equalizing ring (15), and the metal nozzle (9) and the metal discharging net (16) keep a distance of 2mm.
The power supply is a direct current power supply, and the voltage is 8000V.
The working process of the micro continuous carbon nanotube vapor phase dispersing equipment comprises the following steps:
carbon nano tubes and water are mixed into slurry in a ratio of 1: 100, the slurry is pumped into a feed inlet through a gear pump at a flow rate of 50ml/min, the slurry flows spirally along two axial ends of a screw rod (3) at the same time, the carbon nano tubes flowing towards the direction of the feed outlet flow out of the feed outlet and enter subsequent stirring circulation, the carbon nano tube slurry flowing towards one side of a negative pressure system enters a filter tube (5) of the negative pressure system under the self pressure and the pushing of the screw rod (3), the water of the carbon nano tube slurry in the filter tube (5) can be partially sucked out through the negative pressure suction effect of a vacuum pump on a water outlet hole (7), and the partial water seeps out from the surface of the filter tube (5) and flows out of a gap between the outer side of the filter tube (5) and the inner cavity of an outer sleeve (6) and then flows out of the water outlet hole (7) to be separated from the system. At the moment, the carbon nano tube slurry in the filter tube (5) is in a semi-solid plastic state due to water loss, and is extruded into the metal nozzle (9) by virtue of the propelling action of the screw (3) to form a negative electrode core rod in the discharge dispersion process, the negative electrode core rod is pushed out from the metal nozzle (9) and keeps a 0.5mm distance with the metal discharge network (16), the power supply is switched on, the outer end face of the core rod generates discharge dispersion with the metal discharge network (16), the outer end face of the core rod is consumed, the working or rotating speed of the driving motor (1) is controlled at the moment, the propelling speed of the screw (3) to the core rod is further controlled, and the distance between the outer end face of the core rod and the discharge metal network is kept to be about 5mm all the time. Compressed air enters the air guide pipe (17) from the air path and then enters the air distribution ring (14), the compressed air in the air distribution ring (14) is uniformly sprayed out in an annular mode under the air resistance action of the air equalizing ring (15), the sprayed gas forms an annular air curtain to rapidly take away the carbon nano tubes in the dispersion area, and the formation of the carbon nano tubes in the dispersion gas phase space is increased and the adhesion of the carbon nano tubes on the surface of the insulating part is reduced.
Claims (1)
1. A micro continuous carbon nano tube gas phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, wherein the three systems are connected in sequence; the feeding system is a tubular component, one side of the feeding system is connected with a driving motor (1) and forms a fixed object of the driving motor (1), and the other side of the feeding system is connected with a negative pressure system; an output shaft (2) of the driving motor (1) is connected with a screw (3), the screw (3) axially passes through an inner cavity of the tubular component and can rotate in the inner cavity without resistance under the driving of the driving motor (1), and the major diameter of the screw (3) is 0.01-2 mm smaller than the diameter of the inner cavity; the tubular component is provided with a feed port and a discharge port (4), the feed port and the discharge port (4) penetrate through the single-side pipe wall of the tubular component along the radial direction, the feed port and the discharge port (4) can be respectively arranged in the front and back direction along the axial direction of the tubular component or arranged along the radial direction of the tubular component, and the minimum distance between the feed port and the discharge port (4) and the inner cavity of the tubular component is more than 2mm; the feed port (4) and the discharge port (4) respectively feed and discharge the carbon nano tube slurry, the feed amount of the feed port is greater than the discharge amount of the discharge port, and the feed amount of the feed port is not less than 3ml/min; the negative pressure system comprises a filter tube (5) and an outer sleeve (6), and is characterized in that one side of the negative pressure system is connected with the feeding system, the other side of the negative pressure system is connected with the dispersion system, and the negative pressure system is connected with the negative electrode of the power supply; the inner cavity of the outer sleeve (6) contains the filter tubes (5) and is coaxially arranged, the outer diameter of each filter tube (5) is 0.5-10 mm smaller than the inner diameter of the outer sleeve (6), the screw (3) axially passes through the inner cavity of each filter tube (5) and can rotate without frictional resistance, the major diameter of the screw (3) is 0.01-2 mm smaller than the diameter of the inner cavity of each filter tube (5), and the screw thread direction of the screw (3) and the rotation direction of a motor shaft enable the screw (3) to push materials to one side far away from the driving motor (1); one side of the sleeve is provided with a water outlet hole (7), the water outlet hole (7) is connected with negative pressure, and the pressure is less than 0.09MPa; the precision of the filter tube (5) is required to be satisfied, wherein water is allowed to pass through but the carbon nano tube cannot pass through, and the preferred precision is 0.01-100 mu m; the precision of the filter tube (5) of the negative pressure system, the length of the filter tube (5) and the negative pressure should meet the following requirements: during work, partial separation is carried out on moisture in the carbon nanotube slurry, and the water content in the carbon nanotube slurry after the moisture separation is obtained is less than 90%; the dispersing system comprises a base and a separable machine head (8), wherein the base comprises a metal nozzle (9) and an insulating support (10), the metal nozzle (9) is positioned in the insulating support (10) and is coaxial with the insulating support (10), one side of the metal nozzle (9) is connected to the filter tube (5) and is coaxial with the filter tube (5), the inner diameter of the metal nozzle (9) is as large as the inner diameter of the filter tube (5) or the inner diameter of the metal nozzle (9) is slightly larger than the inner diameter of the filter tube (5), but the diameter difference is smaller than 5mm; the insulating bracket (10) is provided with a metal inserting pipe (11), the metal inserting pipe (11) and the metal nozzle (9) are insulated and isolated by more than 1.5mm, one end of the metal inserting pipe (11) is connected to the positive electrode of a power supply, and the other end of the metal inserting pipe is exposed; the insulation support (10) is provided with a high-pressure gas circuit, one end of the gas circuit is connected with a high-pressure gas source, and the other end of the gas circuit is positioned on the plane of one side of the insulation support (10); the high-pressure gas source can be compressed air or other inert gases, and the pressure of the high-pressure gas source acting on the high-pressure gas circuit is 0.1-10 MPa; the separable handpiece (8) comprises a handpiece insulating bracket (12), a metal contact pin (13), an air distribution ring (14), an air equalization ring (15), a metal discharging net (16) and an air duct (17), the separable handpiece (8) can be connected with the base in a pluggable manner, and the structure depends on interference fit of a metal nozzle (9) and a central hole of the insulating bracket (10); one side of a central opening of the insulating support (10) is provided with a gas distribution ring (14) with the diameter larger than that of the opening, one side of the gas distribution ring (14) is attached with a gas equalization ring (15), the gas equalization ring (15) is made of PP sintering materials, and the central opening is in interference fit with the metal nozzle (9); one end of the air duct (17) is connected with the air distribution ring (14), and the other end is positioned on one side, close to the base, of the insulating bracket (10); one side of the gas-equalizing ring (15) is tightly attached to the gas distribution ring (14), and the other side of the gas-equalizing ring is attached to a metal discharging net (16), wherein the metal discharging net (16) is connected with a metal inserting needle (13); when the separable head (8) is inserted into the base, the connection relationship is as follows: the metal inserting needle (13) is inserted into the metal inserting tube (11), the air guide tube (17) is coaxially connected with the air path, the metal nozzle (9) is inserted into and crosses the air equalizing ring (15), and the metal nozzle (9) and the metal discharging net (16) keep a distance of 1-5 mm; the power supply is a direct current power supply, and the voltage is 2000-25000V.
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