High-pressure sanding dispersing device

Abstract

The utility model relates to the technical field of conductive slurry preparation, in particular to a high-pressure sanding dispersing device which comprises a sanding device and mixing equipment, the sanding device is provided with a solid feed port and a first liquid feed port, and the first liquid feed port is communicated with a discharge port of the mixing equipment; a discharging hole of the sanding device is communicated with a feeding hole of the mixing equipment; the discharge hole of the mixing equipment is also communicated with the gas-liquid mixing device through a self-backflow pipeline, and the gas-liquid mixing device is communicated with the liquid return hole of the mixing equipment. According to the utility model, a circulation loop formed by the sanding device and the mixing equipment is utilized to repeatedly carry out sanding and high-pressure airflow dispersion on the feed liquid of the carbon nanotubes, so that the dispersion degree of the carbon nanotubes can be adjusted and improved as required.

Description

Technical Field

[0001] This utility model relates to the field of conductive paste preparation technology, specifically to a high-pressure sand mill dispersion device. Background Technology

[0002] Conductive paste is a composite material with conductive properties. Its main components include conductive agents, dispersants, and matrix materials. Conductive agents are typically one or more conductive particles, commonly including metal particles, carbon nanotubes, graphene, and conductive polymers. Dispersants are media that can uniformly disperse the conductive agents; they can be surfactants, small organic molecule dispersants, or polymer dispersants, etc. The matrix material is the carrier of the conductive agents and dispersants, and is usually a liquid or fluid. Due to their excellent conductivity and conductivity stability, conductive pastes are widely used in the electronics, optoelectronics, medical, and aerospace industries.

[0003] Carbon nanotubes, as a novel nanomaterial, possess excellent electrical conductivity, mechanical properties, and chemical stability. Using carbon nanotubes as a conductive agent in conductive pastes can reduce the resistivity of the paste and significantly improve its conductivity. However, due to their large specific surface area, high aspect ratio, and strong van der Waals forces, carbon nanotubes are prone to agglomeration or entanglement when mixed with dispersants and matrix materials, forming large aggregates. This reduces the dispersibility of carbon nanotubes in the conductive paste and, to some extent, limits the application and promotion of carbon nanotube conductive pastes.

[0004] Existing conductive paste preparation equipment mainly includes high-pressure homogenizers and sand mills. However, high-pressure homogenizers are mainly developed for the dispersion of layered graphite. Although high-pressure homogenizers can disperse carbon nanotubes through pressure difference, they are generally operated at a constant pressure, so they cannot be adjusted according to the characteristics of the material to be dispersed. Utility Model Content

[0005] To address the technical problem that existing conductive paste preparation equipment cannot be adjusted according to the characteristics of the material to be dispersed, this invention provides a high-pressure sand milling dispersion device. The device utilizes a circulation loop composed of a sand milling device and a mixing device to repeatedly mill and disperse the carbon nanotube liquid with high-pressure airflow, so that the degree of dispersion of carbon nanotubes can be adjusted and improved as needed.

[0006] The technical solution of this utility model is as follows:

[0007] A high-pressure sand mill dispersion device includes a sand mill and a mixing device. The sand mill is provided with a solid feed inlet and a first liquid feed inlet, the first liquid feed inlet being connected to the discharge port of the mixing device. The discharge port of the sand mill is connected to the feed inlet of the mixing device. The discharge port of the mixing device is also connected to a gas-liquid mixing device via a self-return pipeline, and the gas-liquid mixing device is connected to the return liquid port of the mixing device. The solid feed inlet can be used to add carbon nanotube powder to the sand mill, and the first liquid feed inlet can be used to add solvent to the sand mill. The carbon nanotubes are pretreated in the sand mill to obtain a pretreated slurry.

[0008] The preferred sand mill is a sand mill. The first liquid inlet is connected to the outlet of the mixing equipment via a pipeline. A branch pipe can be installed on the pipeline between the first liquid inlet and the outlet of the mixing equipment.

[0009] The gas-liquid mixing device has a "T"-shaped hollow structure and is equipped with a liquid inlet, a gas inlet, and a discharge outlet.

[0010] Furthermore, the gas inlet of the gas-liquid mixing device is connected to a high-pressure gas source, which includes, but is not limited to, a high-pressure nitrogen source and / or a high-pressure argon source. The liquid inlet of the gas-liquid mixing device is connected to a self-return pipeline, and the outlet of the gas-liquid mixing device is connected to the return liquid port of the mixing equipment. The high-pressure gas source can introduce high-pressure gas flow into the mixing equipment through the gas-liquid mixing device to promote the mixing of materials in the mixing equipment.

[0011] Furthermore, a conical guide pipe is installed at the outlet of the gas-liquid mixing device. The large-diameter end of the conical guide pipe is connected to the outlet of the gas-liquid mixing device, and the small-diameter end of the conical guide pipe extends into the interior of the mixing device from the return liquid port, preferably below the liquid surface inside the mixing device. When a high-pressure gas source introduces a high-pressure gas flow into the mixing device, the high-pressure gas flow can disperse the carbon nanotubes inside the mixing device and better disperse some of the agglomerated carbon nanotubes. The presence of the high-pressure gas flow can further increase the eddy current of the liquid inside the mixing device, promote uniform mixing of the liquid, and improve the dispersion efficiency of carbon nanotubes. The conical guide pipe can further increase the flow rate of the high-pressure gas flow and increase the impact force of the high-pressure gas flow on the liquid in the mixing device.

[0012] Furthermore, the high-pressure gas source is connected to the pulse generator, preferably a pulse air pump. The pulse generator can introduce high-pressure gas into the mixing equipment in the form of pulses. The frequency of the pulses is preferably 70-100 times / hour, and each pulse lasts for 5-10 seconds. The frequency and duration of each pulse can also be adjusted as needed.

[0013] Furthermore, the mixing equipment is equipped with an internal stirring device, preferably a mechanical stirring device. The stirring device and the pulse generator operate independently.

[0014] Furthermore, the self-return pipeline is equipped with drainage branches, including a first drainage branch and a second drainage branch. The first drainage branch is connected to the pipeline between the first liquid inlet and the outlet of the mixing equipment, allowing the mixture of carbon nanotubes and solvent after solid-liquid separation to re-enter the sand mill for sand milling. The second drainage branch is used to discharge the uniformly dispersed liquid. A filter device is installed between the second drainage branch and the outlet of the mixing equipment. The filter device is used to separate particles within the mixing equipment. Preferably, the filter device is a filter membrane, and it is preferentially located between the first and second drainage branches.

[0015] Furthermore, the drain branch pipe is connected to a high-pressure air source, which can be used to backflush the filter device and regenerate it.

[0016] Furthermore, the mixing device is also equipped with a second liquid inlet for adding solvent to the mixing device. The solvent enters the mixing device through the second liquid inlet and mixes again with the carbon nanotubes.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention provides a high-pressure sand mill dispersion device, which connects the first liquid inlet of the sand mill device to the outlet of the mixing device, and the outlet of the sand mill device to the inlet of the mixing device, forming a circulation loop between the sand mill device and the mixing device, allowing for repeated sand milling and mixing dispersion of the carbon nanotube liquid. Furthermore, this invention connects the outlet of the mixing device to a gas-liquid mixing device via a self-returning pipeline, and connects the gas-liquid mixing device to the return liquid outlet of the mixing device, allowing for repeated gas-flow mixing and dispersion of the liquid entering the mixing device, thus enabling the degree of dispersion of the carbon nanotubes to be adjusted and improved as needed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the high-pressure sand mill dispersion device in Example 1.

[0021] In the diagram, 1-sand mill, 11-solid feed inlet, 12-first liquid feed inlet, 121-first three-way valve, 122-first drain branch pipe, 2-mixing equipment, 3-second liquid feed inlet, 4-conical guide pipe, 411-gas-liquid mixing device, 5-filter membrane, 6-self-return pipeline, 611-second three-way valve, 612-third three-way valve, 7-second drain branch pipe. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0023] Example 1

[0024] A high-pressure sand mill dispersion device includes a sand mill 1 and a mixing device 2. The sand mill 1 is provided with a solid feed inlet 11 and a first liquid feed inlet 12. The first liquid feed inlet 12 is connected to a first three-way valve 121. The first three-way valve 121 is connected to a solvent storage tank (not shown in the figure) and a first drain branch pipe 122. The first drain branch pipe 122 is connected to a second three-way valve 611. The second three-way valve 611 is connected to the outlet of the mixing device 2 and a third three-way valve 612 through pipelines. The other two ports of the third three-way valve 612 are connected to a self-return pipeline 6 and a second... The drain branch pipe 7 is connected to the main pipe. A filter membrane 5 is installed between the second three-way valve 611 and the third three-way valve 612. The free end of the second drain branch pipe 7 is connected to the second high-pressure gas source. The self-return pipe 6 is connected to the liquid inlet of the gas-liquid mixing device 411. The gas inlet of the gas-liquid mixing device 411 is connected to the high-pressure nitrogen source through a pulse gas pump. The outlet of the gas-liquid mixing device 411 is connected to the large-diameter end of the conical guide pipe 4. The small-diameter end of the conical guide pipe 4 extends into the interior of the mixing device 2 through the return port of the mixing device 2. The gas-liquid mixing device 411 has a "T"-shaped hollow structure. The outlet of the sand mill 1 is connected to the inlet of the mixing device 2 through a pipeline. A valve and a power pump are installed on the pipeline between the outlet of the sand mill 1 and the inlet of the mixing device 2. The mixing device 2 is equipped with a second liquid inlet. A mechanical stirring device is installed inside the mixing device 2. The mechanical stirring device and the pulse gas pump operate independently. A cleaning fluid outlet is provided on the self-returning pipeline 6.

[0025] Instructions for use: The solvent and carbon nanotubes in the solvent storage tank are fed into the sand mill through the first liquid inlet and the solid inlet, respectively, to obtain a pretreated slurry with a carbon nanotube mass fraction of not less than 20%. After sand milling, open the valve and power pump on the pipeline between the outlet of the sand mill and the inlet of the mixing equipment to pump the pretreated slurry from the sand mill into the mixing equipment. At the same time, add a certain amount of solvent into the mixing equipment through the second liquid inlet. Turn on the pulse air pump and the mechanical stirring device inside the mixing equipment. Use the high-pressure nitrogen gas flow output in pulse form and the mechanical stirring device to mechanically stir the liquid inside the mixing equipment and stir it with high-pressure gas flow, promoting secondary mixing of the pretreated slurry and the newly added solvent. The pulse frequency is 70-100 times / hour, each lasting 5-10 seconds. The stirred liquid is discharged through the discharge port of the mixing equipment and the second drain branch of the self-return pipeline for use. During the discharge process, the filter membrane can filter the liquid to retain solid particles in the liquid. After the liquid material is discharged from the outlet of the mixing equipment, open the valve controlling the pipeline between the second three-way valve and the first three-way valve. The stirred liquid material can then be reintroduced into the sand mill. Add carbon nanotubes to the sand mill at this time, and perform another sand milling process. This allows the carbon nanotubes and solvent to continue mixing, completing the first cycle of adding solvent, stirring, adding carbon nanotubes, and grinding. The ground liquid material can then be pumped back into the mixing equipment to begin the second cycle of adding solvent, stirring, adding carbon nanotubes, and grinding. This cycle is repeated until the set number of cycles is completed, resulting in a dispersed slurry of agglomerated carbon nanotubes. Pump this dispersed slurry into the mixing equipment, add an equal amount of solvent as in the previous cycle, and stir to obtain a thinned slurry. Add a dispersant to the thinned slurry and stir until homogeneous to obtain a high-solids-content conductive slurry. The liquid material filtered through the membrane can also be reintroduced into the mixing equipment via a self-return pipeline for further stirring. After a period of use, the filter membrane may experience reduced discharge efficiency due to some carbon nanotube particles remaining on the side facing the mixing equipment, potentially leading to blockage. The high-pressure sand milling and dispersing device provided by this invention introduces a high-pressure airflow from a second high-pressure air source to the discharge side of the filter membrane via a third three-way valve. During cleaning, the high-pressure airflow can be used to back-purge the filter membrane through the third three-way valve, causing the residual carbon nanotubes on the filter membrane to be discharged from the cleaning liquid outlet, thus regenerating the filter membrane.

[0026] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A high-pressure sand mill dispersion device, comprising a sand milling device and a mixing device, characterized in that, The sand mill is equipped with a solid feed inlet and a first liquid feed inlet. The first liquid feed inlet is connected to the discharge outlet of the mixing equipment. The discharge outlet of the sand mill is connected to the feed inlet of the mixing equipment. The discharge outlet of the mixing equipment is also connected to the gas-liquid mixing device through a self-return pipeline. The gas-liquid mixing device is connected to the liquid return port of the mixing equipment.

2. The high-pressure sand mill dispersion device as described in claim 1, characterized in that, The gas inlet of the gas-liquid mixing device is connected to a high-pressure gas source, the liquid inlet of the gas-liquid mixing device is connected to a self-return pipeline, and the discharge port of the gas-liquid mixing device is connected to the return liquid port of the mixing equipment.

3. The high-pressure sand mill dispersion device as described in claim 2, characterized in that, The outlet of the gas-liquid mixing device is equipped with a conical guide pipe. The large-diameter end of the conical guide pipe is connected to the outlet of the gas-liquid mixing device, and the small-diameter end of the conical guide pipe extends into the interior of the mixing device through the return liquid port.

4. The high-pressure sand mill dispersion device as described in claim 2, characterized in that, The high-pressure gas source is connected to the pulse generator.

5. The high-pressure sand mill dispersion device as described in claim 1, characterized in that, The mixing equipment is equipped with an internal stirring device.

6. The high-pressure sand mill dispersion device as described in claim 2, characterized in that, The self-return pipeline is equipped with a drain branch pipe, and a filter device is installed between the drain branch pipe and the discharge port of the mixing equipment.

7. The high-pressure sand mill dispersion device as described in claim 6, characterized in that, The drain branch pipe is connected to the high-pressure gas source.

8. The high-pressure sand mill dispersion device as described in claim 1, characterized in that, The mixing equipment is also equipped with a second liquid inlet.

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