Mixing and dispersing device with electrostatic generator and method

Abstract

The invention discloses a mixing and dispersing device and method with an electrostatic generator, the device comprises the electrostatic generator, impact assemblies, a material tank and a discharge port, the impact assemblies are symmetrically arranged on two sides of the material tank, the electrostatic generator is connected with the impact assemblies, and the discharge port is arranged at the bottom of the material tank. A curved pipeline is arranged in a spray gun of the impact assembly, materials collide with the pipeline to be mixed and dispersed for the first time, the sprayed materials collide to form an impinging stream through the oppositely arranged spray guns to be mixed and dispersed for the second time, the uniformity of mixing and dispersing is remarkably improved, and the fineness of the materials is guaranteed. The continuous production of material mixing and dispersing can be realized, and the production efficiency is high.

Description

Technical Field

[0001] The invention belongs to the field of material processing, in particular to the field of material mixing and dispersion, and more specifically, relates to a mixing and dispersion device and method with an electrostatic generator. Background Art

[0002] In industrial production, the mixing and dispersion of materials is particularly critical. Traditional mixing and dispersion methods mainly use mechanical methods, such as high-speed stirring, ball milling, etc., which have problems such as poor uniformity, low efficiency, high energy consumption, easy damage to equipment, and inability to ensure particle fineness. There are also methods that use airflow mixing and dispersion, such as fluidized beds, airflow mills, etc. This method has high requirements on the particle size, shape, and quality of the original materials. When the material is an ultra-fine powder, there are also problems such as easy agglomeration, incomplete dispersion, and difficulty in discharging materials by bridging. The above traditional methods mainly stay at the mixing and dispersion of material particles, and the effect is poor.

[0003] In view of this, overcoming the technical defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a mixing and dispersing device and method, the purpose of which is to improve the material mixing and dispersing effect to solve the current technical problem of poor material mixing effect.

[0005] To achieve the above object, according to one aspect of the present invention, a mixing and dispersing device with an electrostatic generator is provided, the device comprising an electrostatic generator, an impact assembly, a material tank and a material outlet, wherein:

[0006] The impact components are symmetrically arranged on both sides of the material tank, the electrostatic generator is connected to the impact components, and the discharge port is arranged at the bottom of the material tank.

[0007] As a further improvement and supplement to the above solution, the present invention also includes the following additional technical features.

[0008] Preferably, the impact assembly includes spray guns, the number of the spray guns is at least 2, and the spray guns are arranged horizontally relative to each other in pairs.

[0009] Preferably, the impact assembly further comprises a pipe and a nozzle, the pipe is arranged in the spray gun, and the pipe outlet is concentrated at the nozzle.

[0010] Preferably, the pipeline is in a curve shape, a spiral shape or a broken line shape or a combination of these.

[0011] Preferably, when there are multiple pipes, the pipe outlets converge at the center of the nozzle.

[0012] Preferably, the device further comprises an exhaust port, and the exhaust port is arranged at the top of the device.

[0013] Preferably, the voltage range of the electrostatic generator is 10 kV-100 kV.

[0014] Preferably, the spray gun is externally connected to a compressed gas device and an electrostatic generator, and the material enters the spray gun along with the compressed air flow.

[0015] Preferably, the material sprayed from the nozzle carries charges in the same direction.

[0016] According to another aspect of the present invention, a mixing and dispersing method with an electrostatic generator is provided, characterized in that the mixing and dispersing device with an electrostatic generator as described in the first aspect is used, and the method comprises:

[0017] The electrostatic generator provides high-voltage static electricity to the spray gun, and the material enters the spray gun along with the compressed air flow and moves along the pipe inside the spray gun cavity;

[0018] As the material moves forward, it collides with the pipe and particles collide with each other. When the material is sprayed out through the nozzle, it is charged in the same direction under the action of high-voltage static electricity, forming charged particles, which then collide horizontally with the charged particles sprayed out from the opposite spray gun to form an impact flow, thereby achieving mixing and dispersion of the material.

[0019] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art:

[0020] The present invention provides a mixing and dispersing device and method with an electrostatic generator. A curved pipeline is arranged inside the spray gun, and the material collides with the pipeline to perform a primary mixing and dispersing. The spray guns arranged opposite to each other make the ejected materials collide with each other to form an impact flow, and perform a secondary mixing and dispersing, which significantly improves the uniformity of the mixing and dispersing and ensures the fineness of the material. The present invention can realize the continuous production of material mixing and dispersing, and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic diagram of a mixing and dispersing device with an electrostatic generator provided in the first embodiment;

[0023] Figure 2It is a schematic diagram of two pipes arranged in a spray gun in a mixing and dispersing device with an electrostatic generator provided in the first embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of a pipe provided in a spray gun of a mixing and dispersing device with an electrostatic generator provided in the first embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of a spiral pipeline in a mixing and dispersing device with an electrostatic generator provided in the first embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a nozzle in a mixing and dispersing device with an electrostatic generator provided in the first embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the collision of materials in a mixing and dispersing device with an electrostatic generator provided in the first embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of a mixing and dispersing method with an electrostatic generator provided in the second embodiment;

[0029] Figure 8 This is a SEM image of the material after mixing lithium iron phosphate and carbon nanotubes using a conventional mixer;

[0030] Fig. 9 This is a SEM picture of the material after lithium iron phosphate and carbon nanotubes are mixed using a mixing and dispersing device with an electrostatic generator provided in the first embodiment.

[0031] in:

[0032] 1- spray gun; 2- first material pipeline; 3- second material pipeline; 4- nozzle; 5- material tank; 6- material outlet; 7- exhaust port; 8- electrostatic generator; 9- high voltage positive wire; 10- ground wire. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Embodiment 1

[0035] This embodiment 1 provides a mixing and dispersing device with an electrostatic generator, such as Figure 1 As shown, the device includes an electrostatic generator 8, an impact assembly, a material tank 5 and a discharge port 6, wherein:

[0036] The impact components are symmetrically arranged on both sides of the material tank 5 , the electrostatic generator 8 is connected to the impact components, and the discharge port 6 is arranged at the bottom of the material tank 5 .

[0037] In order to achieve the effect of secondary mixing and dispersion of materials, in combination with the embodiments of the present invention, there is also a preferred implementation scheme, specifically, as follows Figure 1 and Figure 2 As shown, the impact assembly includes a spray gun 1, and the number of the spray guns is at least 2, and the spray guns are arranged horizontally in pairs. There are two pairs of impact assemblies, and each pair of spray guns 1 is arranged horizontally in pairs. The spray guns 1 are fed by dual pipelines. The two materials collide internally in the first material pipeline 2 and the second material pipeline 3, respectively, and the two materials collide externally with the materials sprayed from the opposite spray gun 1 again after being sprayed from the spray gun 1. The materials in each material pipeline can be different materials, so Figure 1 Up to 4 materials can be mixed. Figure 3 and Figure 4 As shown, two spray guns 1 are arranged horizontally relative to each other to form a pair, and the spray gun 1 is fed by a single pipeline. The material has an internal collision in the single pipeline. After the material is sprayed out from the spray gun 1, it has an external collision with the material sprayed out from the opposite spray gun 1 again.

[0038] In order to gather the materials together after a collision, there is also a preferred implementation scheme in combination with the embodiment of the present invention, specifically, as follows: Figure 1 and Figure 3 As shown, the impact assembly further includes a pipe and a nozzle 4 , the pipe is arranged in the spray gun 1 , and the pipe outlet is concentrated at the nozzle 4 .

[0039] In order to allow the material and the pipe to fully collide during one collision, there is also a preferred implementation scheme in combination with the embodiment of the present invention. Specifically, the pipe is a combination of one or more of a curve, a spiral or a broken line. Figure 4 As shown, the first material pipeline 2 is spiral.

[0040] In the first embodiment, the pipeline includes a first material pipeline 2 and a second material pipeline 3 , and the first material pipeline 2 and the second material pipeline 3 are independent of each other and cross-wound in the spray gun 1 .

[0041] In the first embodiment, the first material pipeline 2 and the second material pipeline 3 are respectively connected to high-pressure carrier gas, which can be compressed air, nitrogen, etc. When there are multiple pipelines, the pipeline outlets converge at the center of the nozzle. When the material is sprayed through the nozzle 4, it is charged in the same direction under the action of high-voltage static electricity to form charged particles. Electrostatic Coulomb repulsion can effectively inhibit particle aggregation.

[0042] In order to ensure safety during the process of material mixing and dispersion, in combination with the embodiment of the present invention, there is also a preferred implementation scheme, which is specifically characterized in that the device also includes an exhaust port 7, and the exhaust port 7 is arranged on the top of the device.

[0043] In order to achieve the effect of secondary mixing and dispersion of materials, in combination with the embodiment of the present invention, there is also a preferred implementation scheme. Specifically, the voltage range of the electrostatic generator 8 is 10kV-100kV.

[0044] In order to improve the effect of secondary mixing and dispersion of materials, in combination with the embodiments of the present invention, there is also a preferred implementation scheme, specifically, as follows: Figure 1 As shown, the spray gun 1 is externally connected to a compressed gas device and an electrostatic generator 8, and the material enters the spray gun 1 along with the compressed gas flow. For safety reasons, the electrostatic generator 8 is also connected to a high-voltage positive line 9 and a ground line 10.

[0045] In order to improve the effect of secondary mixing and dispersion of materials, in combination with the embodiment of the present invention, there is also a preferred implementation scheme. Specifically, the material sprayed out by the nozzle 4 has the same direction of charge.

[0046] like Figure 5 As shown, the nozzle 4 can be of a common structure or a Laval structure. When the airflow passes through the throat and enters the expansion section, the flow velocity is further increased, thereby increasing the impact force.

[0047] Embodiment 2:

[0048] The second embodiment provides a mixing and dispersing method, using the mixing and dispersing device provided in the first embodiment, the method includes: Figure 7 Steps shown:

[0049] The electrostatic generator provides high-voltage static electricity to the spray gun, and the material enters the spray gun along with the compressed air flow and moves along the pipe inside the spray gun cavity;

[0050] As the material moves forward, it collides with the pipe and particles collide with each other. When the material is sprayed out through the nozzle, it is charged in the same direction under the action of high-voltage static electricity, forming charged particles, which then collide horizontally with the charged particles sprayed out from the opposite spray gun to form an impact flow, thereby achieving mixing and dispersion of the material.

[0051] like Figure 6 As shown, the material comes out of the spray gun 1 and forms positively charged particles under the action of high voltage static electricity. The particles have the same charge and repel each other, which effectively prevents aggregation and improves the dispersion effect. The two groups of charged particles move at high speed in the direction of the arrow, forming an impact flow and penetrating into the opposite fluid, improving the uniformity of mixing and dispersion.

[0052] The material form may be powder particles, and the particle size may be micro-nano level. The material may be a single component or a mixture of multiple components. The material may have the same or different densities. Specifically, the material type may be a polymer material, including at least one of polytetrafluoroethylene, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trifluoroethylene, polymethyl methacrylate, polyethylene oxide, polyethylene, polypropylene, sodium carboxymethyl cellulose, and polyvinyl pyrrolidone. The material may be at least one of conductive carbon black, acetylene black, carbon nanotubes, and graphene. The material may be at least one of lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium manganese phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium nickel manganese oxide, manganese dioxide, and layered oxides. The material may be at least one of graphite, silicon, hard carbon, soft carbon, lithium titanate, lithium, sulfur, and activated carbon. The material may be a solid electrolyte.

[0053] Comparative Example: Lithium iron phosphate with a tap density of 1.20 g / cm3 and carbon nanotubes with a tap density of 0.03 g / cm3 were put into a V-type mixer at a mass ratio of 100:1. The mixer was stirred at a high speed of 50 Hz / min for 1 hour and the materials were discharged. Figure 8 As shown, carbon nanotubes are prone to form agglomerates due to the strong agglomeration effect of nanopowders, and there is a huge difference in weight between lithium iron phosphate and carbon nanotubes. After mixing using a conventional mixer, the carbon nanotube material still maintains its original agglomeration state, resulting in it being unable to be fully dispersed in lithium iron phosphate.

[0054] In the second embodiment, lithium iron phosphate with a tap density of 1.20 g / cm3 and carbon nanotubes with a tap density of 0.03 g / cm3 are added into a liquid with a mass ratio of 100:1. Figure 3 In the device shown, the electrostatic voltage is 80kV, the compressed air pressure is 0.8MPa, and the material is discharged after the mixing and dispersion is completed. Fig. 9 As shown, the carbon nanotube aggregates are opened into extremely fine fibers and dispersed in lithium iron phosphate, and the mixing and dispersion effect is greatly improved.

[0055] The device and method are applicable to a wide range of materials and can be applied to multiple fields such as chemical industry, medicine, food, energy, etc. The device and method of the present invention significantly enhance the transfer of heat and mass through the internal and external collision technology between materials, achieve full mixing and dispersion between materials, and achieve material crushing and particle size refinement.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixing and dispersing device with an electrostatic generator, characterized in that: The device comprises an electrostatic generator, an impact assembly, a material tank and a discharge port, wherein: The impact components are symmetrically arranged on both sides of the material tank, the electrostatic generator is connected to the impact components, and the discharge port is arranged at the bottom of the material tank.

2. The mixing and dispersing device with an electrostatic generator according to claim 1, characterized in that: The impact assembly includes spray guns, the number of the spray guns is at least 2, and the spray guns are arranged horizontally in pairs relative to each other.

3. The mixing and dispersing device with an electrostatic generator according to claim 2, characterized in that: The impact assembly further comprises a pipe and a nozzle, wherein the pipe is arranged in the spray gun, and an outlet of the pipe is concentrated at the nozzle.

4. The mixing and dispersing device with an electrostatic generator according to claim 3, characterized in that: The pipeline is in a curve shape, a spiral shape or a broken line shape or a combination of these.

5. The mixing and dispersing device with an electrostatic generator according to claim 4, characterized in that: The pipeline includes a first material pipeline and a second material pipeline, and the first material pipeline and the second material pipeline are independent of each other and cross-wound in the spray gun.

6. The mixing and dispersing device with an electrostatic generator according to claim 1, characterized in that: The device also includes an exhaust port, which is disposed at the top of the device.

7. The mixing and dispersing device with an electrostatic generator according to claim 1, characterized in that: The voltage range of the electrostatic generator is 10kV-100kV.

8. The mixing and dispersing device with an electrostatic generator according to claim 7, characterized in that: The spray gun is externally connected to a compressed gas device and an electrostatic generator, and the material enters the spray gun along with the compressed air flow.

9. The mixing and dispersing device with an electrostatic generator according to claim 3, characterized in that: The material sprayed out of the nozzle carries charges in the same direction.

10. A method for mixing and dispersing a device with an electrostatic generator, characterized in that: Using the mixing and dispersing device with an electrostatic generator as described in claims 1-9, the method comprises: The electrostatic generator provides high-voltage static electricity to the spray gun, and the material enters the spray gun along with the compressed air flow and moves along the pipe inside the spray gun cavity; As the material moves forward, it collides with the pipe and particles collide with each other. When the material is sprayed out through the nozzle, it is charged in the same direction under the action of high-voltage static electricity, forming charged particles, which then collide horizontally with the charged particles sprayed out from the opposite spray gun to form an impact flow, thereby achieving mixing and dispersion of the material.

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