CN115536008B - Miniature continuous carbon nanotube gas-phase dispersing equipment - Google Patents
Miniature continuous carbon nanotube gas-phase dispersing equipment Download PDFInfo
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- CN115536008B CN115536008B CN202211125926.4A CN202211125926A CN115536008B CN 115536008 B CN115536008 B CN 115536008B CN 202211125926 A CN202211125926 A CN 202211125926A CN 115536008 B CN115536008 B CN 115536008B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 52
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 72
- 239000000463 material Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 13
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 6
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000002086 nanomaterial Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc 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
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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 micro continuous carbon nano tube gas-phase dispersing equipment 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 dispersing system, and the negative pressure system is connected with the negative electrode of the power supply. The dispersion system comprises a base and a separable handpiece, and the structure relies on interference fit between a metal nozzle and a central opening of an insulating bracket. Compressed air is evenly sprayed out of the metal nozzle in an annular shape, and the sprayed gas forms an annular air curtain to quickly separate the carbon nano tubes in the dispersing area, so that the formation of the carbon nano tubes in the dispersing 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 miniature continuous carbon nano tube gas-phase dispersing equipment, and belongs to the technical field of nano material processing machinery.
Background
The carbon nano tube has excellent properties of force, light, heat, electricity and the like, and has wide application space in a plurality of fields. However, carbon nanotubes have a large specific surface area, are extremely easy to agglomerate and difficult to disperse under the actions of van der Waals force and hook connection winding, and bring great inconvenience and performance loss to downstream application.
In order to solve the problems, the prior art realizes the agglomeration processing of the carbon nano tube by ultrasonic, ball milling, high shearing and the like.
In recent years, the thermal effect of plasma discharge excites working media contained in carbon nanotubes to realize gas-phase dispersion of the carbon nanotubes.
The patent ZL201610494447.8 discloses a carbon nanotube dispersing method, which comprises the steps of firstly preparing a carbon nanotube mixture of carbon nanotubes and a binder which are mixed according to a certain proportion. And then pressurizing the carbon nano tube mixture to prepare a strip electrode, and connecting the prepared carbon nano tube mixture electrode with a power supply. The power supply is switched on to generate enough current in the carbon nano tube mixture electrode, and the adhesive in the carbon nano tube mixture is quickly vaporized by utilizing the thermal effect of the current in the electrode to generate dispersion effect on the carbon nano tube.
The invention patent ZL2015136821. X discloses a carbon nano tube 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 the positive electrode of the power supply is made of materials such as metal; (4) keeping the positive electrode and the negative electrode of the power supply at a certain distance; (5) The power supply is switched on, so that electric arc, plasma, electric spark 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 tube is subjected to phase change under the action of high temperature, so that the carbon nano tube is effectively dispersed.
However, from the disclosed technology, the technology lacks continuous specialized implementation equipment, and forms an application bottleneck of the related technology.
Disclosure of Invention
Aiming at the defects of the prior art in the background technology, the invention provides micro continuous carbon nano tube gas-phase dispersing equipment which can realize small-space continuous carbon nano tube gas-phase dispersing.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a miniature continuous carbon nanotube gas-phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, which are sequentially connected.
The feeding system is a tubular component, one side of the tubular component is connected with a driving motor and forms a fixed object of the driving motor, and the other side of the tubular component is connected with a negative pressure system. The output shaft of the driving motor is connected with a screw rod which axially passes through the inner cavity of the tubular component and can rotate in the inner cavity without resistance under the drive of the driving motor, and the major diameter of the screw rod is smaller than the diameter of the inner cavity by 0.01-2 mm. The tubular component is provided with a first material inlet and a second material outlet, the material inlet and the material outlet penetrate through the single-side pipe wall of the tubular component along the radial direction, the material inlet and the material outlet can be respectively arranged in front and back along the axial direction of the tubular component or are radially arranged along the tubular component, and the minimum distance between the material inlet and the material outlet and the inner cavity of the tubular component is more than 2mm. The feeding and discharging ports are respectively used for feeding and discharging the carbon nanotube slurry, the feeding amount of the feeding port is larger than the discharging amount of the discharging port, and the feeding amount of the feeding 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 dispersing 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 the filter tubes is smaller than the inner diameter of the outer sleeve by 0.5-10 mm, the screw rod axially passes through the inner cavity of the filter tubes and can rotate without friction resistance, the large diameter of the screw rod is smaller than the diameter of the inner cavity of the filter tubes by 0.01-2 mm, and the screw rod pushes materials to one side far away from the driving motor by the screw rod in the screw thread direction and the rotating direction of the motor shaft. 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 filter tube precision should be such that it allows water to pass but not carbon nanotubes, preferably 0.01 to 100 μm. The filter tube precision, the filter tube length and the negative pressure of the negative pressure system should be as follows: in operation, the water content in the carbon nano tube slurry is partially separated, and the water content in the carbon nano tube slurry after the water content is separated 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 bracket, the metal nozzle is positioned in the insulating bracket and is coaxial with the insulating bracket, one side of the metal nozzle is connected with the filter tube and is coaxial with the filter tube, the inner diameter of the metal nozzle is equal to the inner diameter of the filter tube or slightly larger than the inner diameter of the filter tube, and the diameter difference is smaller 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 to the positive electrode of the power supply, and the other end of the metal insertion tube is exposed. The insulating support is provided with a high-pressure air passage, one end of the air passage is connected with a high-pressure air source, and the other end of the air passage is positioned on a plane on one side of the insulating support. The high-pressure air source can be compressed air or other inert gases, and the pressure of the high-pressure air source acting on the high-pressure air path is 0.1-10 MPa.
The separable handpiece comprises a handpiece insulating support, a metal contact pin, a gas distribution ring, a metal discharge grid and a gas guide tube, and can be connected with the base in a pluggable manner. One side of the central opening of the insulating support is provided with a gas distribution ring with the diameter larger than that of the opening, one side of the gas distribution ring is stuck with a gas equalizing ring, the gas equalizing ring is 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 is positioned at one side of the insulating bracket close to the base. One side of the air equalizing ring is tightly attached to the other side of the air distributing ring, and a metal discharging net is attached to the other side of the air distributing ring and is connected with metal pins.
The connection relation when the separable head is inserted into the base is as follows: the metal contact pin is inserted in the metal cannula, the air duct is coaxially connected with the air path, the metal nozzle is inserted into and passes over the air equalizing ring, and the distance between the metal nozzle and the metal discharge net is kept between 1 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 invention provides the miniature continuous carbon nanotube gas-phase dispersing equipment, common carbon nanotube slurry can be conveyed remotely and flexibly, and on the basis, continuous, stable and controllable gas-phase dispersing is carried out on the carbon nanotubes in the slurry, 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 dispersing sites is greatly saved.
Drawings
FIG. 1 is a schematic diagram of a gas-phase dispersion apparatus for micro-continuous carbon nanotubes according to the present invention
In the figure: 1. the device comprises a driving motor, an output shaft, a screw rod, a material inlet and a material outlet, a filter tube, an outer sleeve, a water outlet, a separable machine head, a metal nozzle, an insulating support, a metal insertion tube, a machine head insulating support, a metal insertion needle, a gas distribution ring, a metal discharge grid and a gas guide tube.
Detailed Description
The invention is further described in terms of the following specific embodiments in conjunction with the accompanying drawings:
a miniature continuous carbon nanotube gas-phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, which are sequentially connected.
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 the screw (3), the screw (3) axially passes through the inner cavity of the tubular component and can rotate in the inner cavity without resistance under the driving of the driving motor (1), the large diameter of the screw (3) is smaller than the diameter of the inner cavity by 0.5mm, and the screw thread direction and the rotating direction of the motor shaft of the screw (3) are required to be satisfied so that the screw (3) pushes materials to one side far away from the driving motor (1). The pipe-shaped part is provided with a first feeding hole and a second feeding hole (4), the first feeding hole and the second feeding hole (4) penetrate through the single-side pipe wall of the pipe-shaped part along the radial direction, the first feeding hole and the second feeding hole (4) are respectively arranged in front of and behind the axial direction of the pipe-shaped part, and the first feeding hole and the second feeding hole (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 is connected with the feeding system, the other side is connected with the dispersing system, and the negative pressure system is connected with the negative electrode of the power supply. The inner cavity of the outer sleeve (6) comprises filter tubes (5) which are coaxially arranged, the outer diameter of the filter tubes (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 the filter tubes (5) and can rotate without friction resistance, and the large diameter of the screw rod (3) is smaller than the inner cavity diameter imm of the filter tubes (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 which is 0.04MPa. The precision of the filter tube (5) is 30 μm.
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 with the filter tube (5) and is coaxial with the filter tube (5), and the inner diameter of the metal nozzle (9) is equal to the inner diameter 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 is 2mm away. One end of the metal cannula (11) is connected with the positive electrode of the power supply, and the other end is exposed. The insulating support (10) is provided with a high-pressure air passage, one end of the air passage is connected with a high-pressure air source, and the other end of the air passage is positioned on one side plane of the insulating support (10). The high-pressure air source is compressed air, and the pressure is 0.2MPa.
The separable handpiece (8) comprises a handpiece insulating support (12), a metal contact pin (13), a gas distribution ring (14), a gas distribution ring (15), a metal discharge grid (16) and a gas guide tube (17), and the separable handpiece (8) can be connected with the base in a pluggable manner, and in the structure, the metal nozzle (9) is in interference fit with a central opening of the insulating support (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 stuck with a gas equalizing ring (15), the gas equalizing 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 air equalizing ring (15) is tightly attached to the air distributing ring (14), the other side of the air equalizing ring is attached to a metal discharging grid (16), and the metal discharging grid (16) is connected with a metal contact pin (13).
The connection relation when the separable machine head (8) is inserted into the base is as follows: the metal contact pin (13) is inserted in the metal insertion pipe (11), the air duct (17) is coaxially connected with the air duct, the metal nozzle (9) is inserted into and passes over the air equalizing ring (15), and the distance between the metal nozzle (9) and the metal discharge grid (16) is kept at 2mm.
The power supply is a direct current power supply, and the voltage is 8000V.
The working process of the miniature continuous carbon nano tube gas-phase dispersing equipment comprises the following steps:
the carbon nano tube and water are prepared into slurry according to the ratio of 1:100, the slurry is pumped into a feed inlet through a gear pump at the flow rate of 50ml/min, at the moment, the slurry simultaneously flows spirally along the two ends of the axial direction of a screw rod (3), the carbon nano tube flowing towards the direction of a discharge hole flows out of the discharge hole and enters the subsequent beating 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 content of the carbon nano tube slurry in the filter tube (5) can be sucked out through the negative pressure suction effect of a vacuum pump on a water outlet hole (7), and the water content of the carbon nano tube slurry is oozed out of the water outlet hole (7) from the surface of the filter tube (5) through the gap between the outer side of the filter tube (5) and the inner cavity of an outer sleeve (6) so as to be separated from the system. At this time, the carbon nano tube slurry in the filter tube (5) is in a semi-solid plastic state due to water loss, the slurry is extruded into the metal nozzle (9) by virtue of the pushing action of the screw (3) to form a negative core rod in the discharge dispersion process, the negative core rod is pushed out of the metal nozzle (9) and keeps 0.5mm distance from the metal discharge grid (16), the power supply is switched on, the outer end face of the core rod and the metal discharge grid (16) generate discharge dispersion, the outer end face of the core rod is consumed, the working condition or the rotating speed of the driving motor (1) is controlled at this time, and then the pushing speed of the screw (3) to the core rod is controlled, so that the distance between the outer end face of the core rod and the discharge metal grid is always kept at about 5mm. Compressed air enters the air guide pipe (17) from the air passage and then enters the air distribution ring (14), the compressed air in the air distribution ring (14) is uniformly sprayed out in a ring shape under the air resistance effect of the air distribution ring (15), the sprayed air forms a ring-shaped air curtain to quickly bring away the carbon nano tubes in the dispersing area, and the process increases the formation of the carbon nano tubes in the dispersing gas-phase space and reduces the adhesion of the carbon nano tubes on the surface of the insulating part.
Claims (1)
1. A miniature continuous carbon nanotube gas-phase dispersing device consists of a feeding system, a negative pressure system and a dispersing system, wherein the three systems are sequentially connected; 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 output shaft (2) of the driving motor (1) is connected with a screw rod (3), the screw rod (3) axially passes through the inner cavity of the tubular component and can rotate in the inner cavity without resistance under the drive of the driving motor (1), and the large diameter of the screw rod (3) is smaller than the diameter of the inner cavity by 0.01-2 mm; the tubular component is provided with a first material inlet and a second material outlet (4), the material inlet and the material outlet (4) penetrate through the single-side pipe wall of the tubular component along the radial direction, the material inlet and the material outlet (4) are respectively arranged in front and back along the axial direction of the tubular component or are arranged along the radial direction of the tubular component, and the minimum distance between the material inlet and the material outlet (4) and the inner cavity of the tubular component is more than 2mm; the feeding and discharging ports (4) are respectively used for feeding and discharging carbon nanotube slurry, the feeding amount of the feeding port is larger than the discharging amount of the discharging port, and the feeding amount of the feeding port is not lower than 3ml/min; the negative pressure system comprises a filter tube (5) and an outer sleeve (6), and is characterized in that one side is connected with the feeding system, the other side is connected with the dispersing system, and the negative pressure system is connected with the negative electrode of the power supply; the inner cavity of the outer sleeve (6) comprises filter tubes (5) which are coaxially arranged, the outer diameter of the filter tubes (5) is smaller than the inner diameter of the outer sleeve (6) by 0.5-10 mm, the screw rod (3) axially passes through the inner cavity of the filter tubes (5) and can rotate without friction resistance, the large diameter of the screw rod (3) is smaller than the diameter of the inner cavity of the filter tubes (5) by 0.01-2 mm, and the screw thread direction of the screw rod (3) and the rotating direction of a motor shaft enable the screw rod (3) to push materials to the 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) should meet the requirement that the water is allowed to pass through but not the carbon nano tube, and the diameter 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 be as follows: in the work, the water content in the carbon nano tube slurry is partially separated, and the water content in the carbon nano tube slurry after the water content is separated is less than 90 percent; the dispersing system comprises a base and a separable machine head (8), wherein the base comprises a metal nozzle (9) and an insulating bracket (10), the metal nozzle (9) is positioned in the insulating bracket (10) and is coaxial with the insulating bracket (10), one side of the metal nozzle (9) is connected with the filter tube (5) and is coaxial with the filter tube (5), the inner diameter of the metal nozzle (9) is equal to 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 insertion pipe (11), the metal insertion pipe (11) and the metal nozzle (9) are insulated and isolated by more than 1.5mm, one end of the metal insertion pipe (11) is connected with the positive electrode of the power supply, and the other end is exposed; the insulating support (10) is provided with a high-pressure air passage, one end of the air passage is connected with a high-pressure air source, and the other end of the air passage is positioned on one side plane of the insulating support (10); the high-pressure air source is compressed air or other inert gases, and the pressure of the high-pressure air source acting on the high-pressure air path is 0.1-10 MPa; the separable handpiece (8) comprises a handpiece insulating support (12), a metal contact pin (13), a gas distribution ring (14), a gas distribution ring (15), a metal discharge grid (16) and a gas guide tube (17), and the separable handpiece (8) can be connected with the base in a pluggable manner, and in the structure, the metal nozzle (9) is in interference fit with a central opening of the insulating support (10); a gas distribution ring (14) with the diameter larger than that of the opening is arranged on one side of the central opening of the insulating support (10), a gas distribution ring (15) is attached to one side of the gas distribution ring (14), the gas distribution 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 air equalizing ring (15) is tightly attached to the air distributing ring (14), the other side of the air equalizing ring is attached to a metal discharging grid (16), and the metal discharging grid (16) is connected with a metal contact pin (13); the connection relation when the separable machine head (8) is inserted into the base is as follows: the metal contact pin (13) is inserted into the metal insertion pipe (11), the air duct (17) is coaxially connected with the air duct, the metal nozzle (9) is inserted into and passes over the air equalizing ring (15), and the distance between the metal nozzle (9) and the metal discharge grid (16) is kept between 1 and 5mm; the power supply is a direct current power supply, and the voltage is 2000-25000V.
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