Preparation device and preparation method of boron nitride-containing heat-conducting composite material

Abstract

The invention relates to the technical field of high thermal conductivity polymer composite materials, in particular to a boron nitride-containing thermal conductivity composite material preparation device and a preparation method thereof.The boron nitride-containing thermal conductivity composite material preparation device comprises a bottom plate, a control panel is fixedly connected to the front surface of the bottom plate, a mixing box is fixedly connected to the top surface of the bottom plate, and an ultrasonic disperser is mounted on the front surface of the mixing box; a top frame is fixedly connected to the top surface of the mixing box, a discharging groove is formed in the inner bottom wall of the top frame, the discharging groove is matched with the mixing box, a supporting seat is fixedly connected to the inner bottom surface of the top frame, and a bidirectional motor is mounted on the upper surface of the supporting seat. Boron nitride powder can be intermittently fed when falling to the inner bottom wall of the top frame, so that the boron nitride powder is relatively dispersed during overall feeding, the boron nitride powder and a solvent can be uniformly mixed through a stirring assembly in the mixing box, and ultrasonic operation can be performed by starting an ultrasonic disperser in the mixing process.

Description

Technical Field

[0001] The present invention relates to the technical field of high - thermal - conductivity polymer composites, and specifically to a preparation device and a preparation method of a thermal - conductive composite material containing boron nitride. Background Art

[0002] Polymer materials have been widely used in the field of power electronics due to their advantages such as light weight, good flexibility, easy processing, and low cost. However, with the development of power - electronic devices towards high integration and high power, the low thermal conductivity of polymer materials has made it difficult to ensure the efficient and stable operation of equipment. Preparing thermal - conductive composite materials by adding high - thermal - conductivity particles (such as boron nitride, graphene, metal oxides, etc.) to a polymer matrix is an effective method to improve the thermal conductivity of polymer materials. Boron nitride has the property of resisting chemical erosion, being not eroded by inorganic acids and water. The boron - nitrogen bond is broken in hot concentrated alkali, starts to oxidize in air above 1200 °C, decomposes at about 2700 °C in vacuum, is slightly soluble in hot acids, insoluble in cold water, has a relative density of 2.29, hydrolyzes very slowly when boiled with water, producing a small amount of boric acid and ammonia. It does not react with weak acids and strong bases at room temperature, is slightly soluble in hot acids, and can only be decomposed by treatment with molten potassium hydroxide. Chlorine can only react with it under red - hot conditions. Its compressive strength is 170 MPa.

[0003] In this regard, Chinese Patent Application No.: CN112852106B discloses an epoxy resin - boron nitride thermal - conductive and flame - retardant composite material and its preparation method. An epoxy resin - boron nitride thermal - conductive and flame - retardant composite material is composed of boron nitride modified with a surface - modifying flame retardant dispersed in epoxy resin, and its addition amount is 0.5 - 20 wt.% of the epoxy resin. The preparation method of the epoxy resin - boron nitride thermal - conductive and flame - retardant composite material is to perform surface - modification grafting treatment on boron nitride with a coupling agent and glycidyl methacrylate, and then bond a melamine - salt - type flame retardant to the surface of boron nitride through a ring - opening reaction. The prepared boron nitride modified with a surface - modifying flame retardant is dispersed in epoxy resin to form a uniform dispersion system of epoxy resin - boron nitride; a curing agent is added for epoxy resin curing treatment, thus obtaining the epoxy resin - boron nitride thermal - conductive and flame - retardant composite material. The epoxy resin - boron nitride thermal - conductive and flame - retardant composite material provided by the present invention has excellent flame - retardant, thermal - conductive, and mechanical properties.

[0004] However, during the preparation of the heat-conducting composite material containing boron nitride, the boron nitride powder is not fed intermittently during the feeding process. As a result, the boron nitride powder is fed as a whole during the feeding process, and the whole boron nitride powder will accumulate in one place during the feeding process, and it cannot be evenly mixed with the isopropyl alcohol IPA solvent inside the mixing tank, resulting in a longer mixing time, slower working efficiency, and the need to keep the environment where the whole nozzle is located warm during the subsequent spraying process. If the insulation is not carried out, the overall heating effect will be poor. Therefore, improving and solving the above problems has become an urgent problem to be solved at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and a preparation method for a heat-conducting composite material containing boron nitride, so as to solve the problem that the boron nitride powder is not fed intermittently during the feeding process as mentioned in the above background technology, resulting in the whole feeding of the boron nitride powder during the feeding process, and the whole boron nitride powder will accumulate in one place during the feeding process, and it cannot be evenly mixed with the isopropyl alcohol IPA solvent inside the mixing tank, resulting in a longer mixing time, slower working efficiency, and the need to keep the environment where the whole nozzle is located warm during the subsequent spraying process. If the insulation is not carried out, the overall heating effect will be poor.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A device for preparing a heat-conducting composite material containing boron nitride, including a bottom plate, the front surface of the bottom plate is fixedly connected with a control panel, the top surface of the bottom plate is fixedly connected with a mixing tank, an ultrasonic disperser is installed on the front surface of the mixing tank, the top surface of the mixing tank is fixedly connected with a top frame, a feeding groove is opened on the inner bottom wall of the top frame, and the feeding groove is adapted to the mixing tank. A support seat is fixedly connected to the inner bottom surface of the top frame, and a bidirectional motor is installed on the upper surface of the support seat;

[0007] A screw rod body, the screw rod body is installed on the left side surface of the bidirectional motor, a sliding frame is arranged on the outer surface of the screw rod body, a guiding block is fixedly connected to the top surface of the sliding frame, a blocking plate is installed on the right side surface of the guiding block, a sliding groove is opened on the inner side wall of the top frame, and the sliding groove is adapted to the sliding frame. The top surface of the top frame is provided with a top plate, and a feeding frame is installed on the upper surface of the top plate, and a protective inclined plate is arranged on the top surface of the feeding frame.

[0008] Preferably, an adaptation groove is opened on the right side of the feeding frame, and a first bevel gear column is arranged on the right side surface of the bidirectional motor.

[0009] Preferably, the outer surface of the first bevel gear column is meshed with a second bevel gear column, and the outer surface of the second bevel gear column is meshed with a third bevel gear column.

[0010] Preferably, a reciprocating ring is arranged on the outer surface of the third conical tooth column, and a moving plate is fixedly connected to the top surface of the reciprocating ring.

[0011] Preferably, a sliding groove is formed on the upper surface of the top plate, the sliding groove is adapted to the reciprocating ring, and the moving plate is adapted to the fitting groove.

[0012] Preferably, a delivery pipe is installed on the right side surface of the mixing box, and a spray head body is installed on the right side of the delivery pipe.

[0013] Preferably, a heating rack is installed on the top surface of the bottom plate, a heat preservation frame is arranged on the upper surface of the heating rack, and the spray head body is installed inside the heat preservation frame.

[0014] Preferably, a switch window is arranged at the front end of the heat preservation frame, a rotating shaft is installed inside the heat preservation frame, and a rotating door is installed on the outer surface of the rotating shaft.

[0015] Preferably, a delivery rack is installed on the right side surface of the heating rack, a limiting block is arranged on the top surface of the delivery rack, there are two groups of limiting blocks, and the installation positions of the two groups of limiting blocks are symmetric to each other.

[0016] A preparation method of a heat-conducting composite material containing boron nitride:

[0017] S1. Mix and ultrasonically operate boron nitride powder and isopropyl alcohol IPA solvent;

[0018] S2. Spray the obtained solution evenly on the surface of a 70 °C polyurethane hot melt adhesive web through a spray gun;

[0019] S3. Hot press the web, the hot press temperature is 135 °C, and the pressure is 6 MPa; preheat for 7 min during hot pressing, the hot press time is 8 min, and the cooling time is 5 min;

[0020] S4. Obtain the heat-conducting composite material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The preparation device and preparation method of the boron nitride-containing thermal conductive composite material. When in use, first, the mixed solvent is placed inside the mixing box, and a stirring component is arranged inside the mixing box. Then, the boron nitride powder is put into the feeding frame. Through the design of the protective inclined plate, the put boron nitride powder can be sealed, so the overall sealing operation effect is good. Then, by starting the bidirectional motor, the bidirectional motor first drives the screw body to rotate. Then, the sliding frame on the surface of the screw body slides left and right on the inner bottom wall of the top frame. Then, the sliding frame drives the guiding block and the blocking plate to slide left and right. When the sliding frame slides left and right, it drives the boron nitride powder on the bottom surface of the top frame into the feeding chute. Then, the boron nitride powder enters the mixing box through the feeding chute and is mixed with the solvent. At the same time, through the design of the guiding block and the blocking plate, the boron nitride powder can be guided and blocked to prevent the boron nitride powder from entering the right side of the blocking plate. Then, the bidirectional motor drives the first bevel gear column to rotate. Then, the first bevel gear column meshes with the second bevel gear column. Subsequently, the second bevel gear column meshes with the third bevel gear column. Then, the third bevel gear column rotates. Then, the reciprocating ring on the surface of the third bevel gear column moves on the surface of the third bevel gear column. Then, the reciprocating ring drives the moving plate to move. Then, the moving plate moves left and right inside the fitting groove. Thus, when the moving plate moves left and right inside the fitting groove, the boron nitride powder inside the feeding frame can be intermittently put. So the overall putting effect is good. Therefore, in this design, when putting the boron nitride powder, first, it is intermittently put inside the feeding frame. Then, when the boron nitride powder falls onto the inner bottom wall of the top frame, it can also be intermittently put. So the overall feeding is relatively dispersed. The stirring component inside the mixing box can evenly mix the boron nitride powder and the solvent. At the same time, starting the ultrasonic disperser during the mixing process can perform ultrasonic operation. So the overall effect is good when preparing the thermal conductive composite material.

[0023] 2. The preparation device and preparation method of the boron nitride-containing thermal conductive composite material. By setting the conveying pipe, the nozzle body, the heating frame, the heat preservation frame, the switch window, the rotating shaft, the rotating door and the conveying frame, after mixing and ultrasonic operating boron nitride powder and solvent inside the mixing box, then it is conveyed into the inside of the nozzle body through the conveying pipe for spraying. At the same time, the mesh is fed onto the top surface of the heating frame through the switch window, and the nozzle body can be installed and placed through the heat preservation frame. Then it is evenly sprayed on the surface of the mesh through the nozzle body. The temperature inside the heat preservation frame can be kept warm through the rotating shaft and the rotating door, so that the mesh can always be in a constant temperature state when spraying the mixed ultrasonic solvent, and thus the overall heat preservation effect is better. When the spraying operation is completed, at this time, the rotating door is opened, and the workpiece assists the mesh to be conveyed onto the surface of the conveying frame for conveying. Then the switch window is opened to convey the next group of meshes onto the top surface of the heating frame. When the mesh on the surface of the conveying frame is conveyed, it is limited by the limiting block, so the overall limiting effect is better. Therefore, the overall steps of this design in preparing the thermal conductive composite material are integrated, and the operation is relatively convenient and the conveying is relatively fast, reflecting the functionality of the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional schematic diagram of the structure of the present invention;

[0025] Figure 2 is a three-dimensional schematic diagram of the structure of the top frame and the top plate of the present invention;

[0026] Figure 3 is a split schematic diagram of the structure of the top frame and the top plate of the present invention;

[0027] Figure 4 is a three-dimensional schematic diagram of the structure of the top plate and the feeding frame of the present invention;

[0028] Figure 5 is a split schematic diagram of the structure of the two-way motor and the third bevel gear column of the present invention;

[0029] Figure 6 is a three-dimensional schematic diagram of the structure of the feeding frame and the third bevel gear column of the present invention;

[0030] Figure 7 is a split schematic diagram of the structure of the adaptor slot and the rotating door of the present invention.

[0031] In the figure: 1, bottom plate; 2, control panel; 3, mixing tank; 4, ultrasonic disperser; 5, top frame; 6, blanking chute; 7, support seat; 8, bidirectional motor; 9, sliding frame; 10, guiding block; 11, baffle plate; 12, chute; 13, top plate; 14, feeding frame; 15, protective inclined plate; 16, fitting groove; 17, screw rod body; 18, first bevel gear column; 19, second bevel gear column; 20, third bevel gear column; 21, reciprocating ring; 22, moving plate; 23, sliding groove; 24, conveying pipe; 25, nozzle body; 26, heating frame; 27, heat preservation frame; 28, switch window; 29, rotating shaft; 30, rotating door; 31, conveying frame; 32, limiting block. Detailed implementation manner

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1 - 7 , an embodiment provided by the present invention:

[0034] A preparation device for a heat-conducting composite material containing boron nitride. The control panel 2, ultrasonic disperser 4, bidirectional motor 8, nozzle body 25, heating rack 26, heat preservation frame 27, and conveying rack 31 used in this application are all products that can be directly purchased on the market. Their principles and connection methods are all well-known prior arts to those skilled in the art, so they will not be elaborated here. It includes a bottom plate 1. The front surface of the bottom plate 1 is fixedly connected with a control panel 2. The top surface of the bottom plate 1 is fixedly connected with a mixing tank 3. The front surface of the mixing tank 3 is equipped with an ultrasonic disperser 4. The top surface of the mixing tank 3 is fixedly connected with a top frame 5. A feeding groove 6 is formed on the inner bottom wall of the top frame 5, and the feeding groove 6 is adapted to the mixing tank 3. A support seat 7 is fixedly connected to the inner bottom surface of the top frame 5. A bidirectional motor 8 is installed on the upper surface of the support seat 7. A conveying pipe 24 is installed on the right side surface of the mixing tank 3. A nozzle body 25 is installed on the right side of the conveying pipe 24. A heating rack 26 is installed on the top surface of the bottom plate 1. A heat preservation frame 27 is arranged on the upper surface of the heating rack 26. The nozzle body 25 is installed inside the heat preservation frame 27. A switch window 28 is arranged at the front end of the heat preservation frame 27. A rotating shaft 29 is installed inside the heat preservation frame 27. A rotating door 30 is installed on the outer surface of the rotating shaft 29. A conveying rack 31 is installed on the right side surface of the heating rack 26. A limiting block 32 is arranged on the top surface of the conveying rack 31. There are two groups of limiting blocks 32, and the installation positions of the two groups of limiting blocks 32 are symmetric to each other. After mixing and ultrasonic operation of boron nitride powder and solvent inside the mixing tank 3, it is then conveyed to the inside of the nozzle body 25 through the conveying pipe 24 for spraying. At the same time, the mesh is fed onto the top surface of the heating rack 26 through the switch window 28, and the nozzle body 25 can be installed and placed through the heat preservation frame 27. Then it is evenly sprayed on the surface of the mesh through the nozzle body 25. The temperature inside the heat preservation frame 27 can be kept warm through the rotating shaft 29 and the rotating door 30, so that the mesh can always be in a constant temperature state when spraying the mixed ultrasonic solvent, and thus the overall heat preservation effect is better. When the spraying operation is completed, the rotating door 30 is opened at this time, and the workpiece assists the mesh to be conveyed to the surface of the conveying rack 31 for conveying. Then the switch window 28 is opened to convey the next group of meshes onto the top surface of the heating rack 26. When the mesh on the surface of the conveying rack 31 is conveyed, it is limited by the limiting block 32, so the overall limiting effect is better. Therefore, the overall steps of this design in preparing the heat-conducting composite material are integrated, the operation is relatively convenient, and the conveying is relatively fast;

[0035] The lead screw body 17 is installed on the left surface of the bidirectional motor 8. A sliding frame 9 is arranged on the outer surface of the lead screw body 17. A guiding block 10 is fixedly connected to the top surface of the sliding frame 9. A blocking plate 11 is installed on the right surface of the guiding block 10. A sliding groove 12 is formed in the inner side wall of the top frame 5, and the sliding groove 12 is adapted to the sliding frame 9. A top plate 13 is installed on the top surface of the top frame 5. A feeding frame 14 is installed on the upper surface of the top plate 13. A protective inclined plate 15 is arranged on the top surface of the feeding frame 14. An adapting groove 16 is formed on the right side of the feeding frame 14. A first bevel gear column 18 is arranged on the right surface of the bidirectional motor 8. A second bevel gear column 19 is meshed with the outer surface of the first bevel gear column 18. A third bevel gear column 20 is meshed with the outer surface of the second bevel gear column 19. A reciprocating ring 21 is arranged on the outer surface of the third bevel gear column 20. A moving plate 22 is fixedly connected to the top surface of the reciprocating ring 21. A sliding groove 23 is formed on the upper surface of the top plate 13, and the sliding groove 23 is adapted to the reciprocating ring 21. The moving plate 22 is adapted to the adapting groove 16. First, the mixed solvent is placed inside the mixing tank 3, and a stirring assembly is arranged inside the mixing tank 3. Then, the boron nitride powder is put into the feeding frame 14. Through the design of the protective inclined plate 15, the put boron nitride powder can be sealed, so that the overall sealing operation effect is good. Then, by starting the bidirectional motor 8, the lead screw body 17 is first driven to rotate by the bidirectional motor 8. Then, the sliding frame 9 on the surface of the lead screw body 17 will slide left and right on the inner bottom wall of the top frame 5. Then, the sliding frame 9 will drive the guiding block 10 and the blocking plate 11 to slide left and right. When the sliding frame 9 slides left and right, the boron nitride powder on the bottom surface of the top frame 5 will be pushed into the blanking groove 6. Then, the boron nitride powder will enter the mixing tank 3 through the blanking groove 6 and be mixed with the solvent. At the same time, through the design of the guiding block 10 and the blocking plate 11, the boron nitride powder can be guided and blocked, and the boron nitride powder is prevented from entering the right side part of the blocking plate 11. Then, the bidirectional motor 8 will drive the first bevel gear column 18 to rotate. Then, the first bevel gear column 18 will be meshed with the second bevel gear column 19. Subsequently, the second bevel gear column 19 will drive the third bevel gear column 20 to be meshed. Then, the third bevel gear column 20 will rotate. Then, the reciprocating ring 21 on the surface of the third bevel gear column 20 will move on the surface of the third bevel gear column 20. Then, the reciprocating ring 21 will drive the moving plate 22 to move. Then, the moving plate 22 will move left and right inside the adapting groove 16. Thus, when the moving plate 22 moves left and right inside the adapting groove 16, the boron nitride powder inside the feeding frame 14 can be intermittently put, so that the overall putting effect is good. Thus, in this design, when putting the boron nitride powder, first, it is intermittently put inside the feeding frame 14, and then when the boron nitride powder falls onto the inner bottom wall of the top frame 5, it can also be intermittently put. Thus, the overall feeding is relatively dispersed, and the boron nitride powder and the solvent can be evenly mixed by the stirring assembly inside the mixing tank 3. At the same time, an ultrasonic disperser 4 can be started during the mixing process to perform ultrasonic operation.Therefore, the overall effect is good when preparing the thermal conductive composite material.

[0036] A preparation method of a thermal conductive composite material containing boron nitride:

[0037] S1. Mix boron nitride powder and isopropyl alcohol (IPA) solvent and perform ultrasonic operation;

[0038] S2. Spray the obtained solution evenly on the surface of a 70°C polyurethane hot melt adhesive web through a spray gun;

[0039] S3. Hot press the web, with a hot press temperature of 135°C and a pressure of 6 MPa; preheat for 7 min during hot pressing, with a hot press time of 8 min and a cooling time of 5 min;

[0040] S4. Obtain the thermal conductive composite material.

[0041] Working principle: When the staff uses this device, first connect the device to an external power source to provide power support for the device. First, the mixed solvent will be placed inside the mixing box 3, and a stirring component is arranged inside the mixing box 3. Then, the boron nitride powder is put into the feeding frame 14. Through the design of the protective inclined plate 15, the put boron nitride powder can be sealed, so the overall sealing operation effect is good. Then, by starting the bidirectional motor 8, the bidirectional motor 8 first drives the screw rod body 17 to rotate. Then, the sliding frame 9 on the surface of the screw rod body 17 will slide left and right on the inner bottom wall of the top frame 5. Then, the sliding frame 9 will drive the guiding block 10 and the blocking plate 11 to slide left and right. When the sliding frame 9 slides left and right, it will push the boron nitride powder on the bottom surface of the top frame 5 into the feeding chute 6. Then, the boron nitride powder will enter the mixing box 3 through the feeding chute 6 and be mixed with the solvent. At the same time, through the design of the guiding block 10 and the blocking plate 11, the boron nitride powder can be guided and blocked to prevent the boron nitride powder from entering the right side of the blocking plate 11. Then, the bidirectional motor 8 will drive the first bevel gear column 18 to rotate. Then, the first bevel gear column 18 will engage with the second bevel gear column 19. Subsequently, the second bevel gear column 19 will engage with the third bevel gear column 20. Then, the third bevel gear column 20 will rotate. Then, the reciprocating ring 21 on the surface of the third bevel gear column 20 will move on the surface of the third bevel gear column 20. Then, the reciprocating ring 21 will drive the moving plate 22 to move. Then, the moving plate 22 will move left and right inside the fitting groove 16. Therefore, when the moving plate 22 moves left and right inside the fitting groove 16, the boron nitride powder inside the feeding frame 14 can be intermittently put in, so the overall putting effect is good. Therefore, in this design, when putting the boron nitride powder, it is first intermittently put in inside the feeding frame 14, and then when the boron nitride powder falls onto the inner bottom wall of the top frame 5, it can also be intermittently put in;

[0042] After mixing and ultrasonicating boron nitride powder and solvent inside the mixing box 3, it is then transported through the delivery pipe 24 into the inside of the nozzle body 25 for spraying. At the same time, the mesh is passed through the switch window 28 onto the top surface of the heating rack 26, and the nozzle body 25 can be installed and placed through the heat preservation frame 27. Then, it is evenly sprayed on the surface of the mesh through the nozzle body 25. The temperature inside the heat preservation frame 27 can be maintained through the rotating shaft 29 and the rotating door 30, so that the mesh can always be in a constant temperature state when spraying the mixed ultrasonic solvent, and thus the overall heat preservation effect is better. When the spraying operation is completed, the rotating door 30 is opened at this time, and the workpiece assists the mesh to be transported onto the surface of the transport rack 31 for transportation. Then, the switch window 28 is opened to transport the next group of meshes onto the top surface of the heating rack 26. When the mesh on the surface of the transport rack 31 is transported, it is limited by the limiting block 32. The above is all the working principles of the present invention.

[0043] The above is only a preferred embodiment of the present invention, and it is not intended to limit the present invention in any form; any ordinary technician in the industry can smoothly implement the present invention according to the instructions in the attached drawings and the above description; however, any equivalent changes such as slight modifications, evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A preparation device for a heat-conducting composite material containing boron nitride, comprising a bottom plate (1), and a control panel (2) fixedly connected to the front surface of the bottom plate (1), characterized in that: The top surface of the bottom plate (1) is fixedly connected with a mixing box (3). An ultrasonic disperser (4) is installed on the front surface of the mixing box (3). The top surface of the mixing box (3) is fixedly connected with a top frame (5). A feeding groove (6) is formed in the inner bottom wall of the top frame (5), and the feeding groove (6) is adapted to the mixing box (3). A support seat (7) is fixedly connected to the inner bottom surface of the top frame (5), and a bidirectional motor (8) is installed on the upper surface of the support seat (7); A lead screw body (17), the lead screw body (17) is installed on the left side surface of the bidirectional motor (8). A sliding frame (9) is arranged on the outer surface of the lead screw body (17). A guiding block (10) is fixedly connected to the top surface of the sliding frame (9). A blocking plate (11) is installed on the right side surface of the guiding block (10). A sliding groove (12) is formed in the inner side wall of the top frame (5), and the sliding groove (12) is adapted to the sliding frame (9). A top plate (13) is installed on the top surface of the top frame (5). A feeding frame (14) is installed on the upper surface of the top plate (13). A protective inclined plate (15) is arranged on the top surface of the feeding frame (14).

2. The preparation device of a heat-conducting composite material containing boron nitride according to claim 1, characterized in that: An adapting groove (16) is formed on the right side of the feeding frame (14), and a first bevel gear column (18) is arranged on the right side surface of the bidirectional motor (8).

3. The preparation device of a heat-conducting composite material containing boron nitride according to claim 2, characterized in that: A second bevel gear column (19) is meshed with the outer surface of the first bevel gear column (18), and a third bevel gear column (20) is meshed with the outer surface of the second bevel gear column (19).

4. The preparation device of a heat-conducting composite material containing boron nitride according to claim 3, characterized in that: A reciprocating ring (21) is arranged on the outer surface of the third bevel gear column (20), and a moving plate (22) is fixedly connected to the top surface of the reciprocating ring (21).

5. The preparation device of a heat-conducting composite material containing boron nitride according to claim 4, characterized in that: A sliding groove (23) is formed on the upper surface of the top plate (13), and the sliding groove (23) is adapted to the reciprocating ring (21). The moving plate (22) is adapted to the adapting groove (16).

6. The preparation device of a heat-conducting composite material containing boron nitride according to claim 1, characterized in that: A delivery pipe (24) is installed on the right side surface of the mixing box (3), and a nozzle body (25) is installed on the right side of the delivery pipe (24).

7. The preparation device of a heat-conducting composite material containing boron nitride according to claim 6, characterized in that: A heating frame (26) is installed on the top surface of the bottom plate (1). A heat preservation frame (27) is arranged on the upper surface of the heating frame (26), and the nozzle body (25) is installed inside the heat preservation frame (27).

8. The preparation device of a heat-conducting composite material containing boron nitride according to claim 7, characterized in that: A switch window (28) is arranged at the front end of the heat preservation frame (27). A rotating shaft (29) is installed inside the heat preservation frame (27), and a rotating door (30) is installed on the outer surface of the rotating shaft (29).

9. The preparation device of a heat-conducting composite material containing boron nitride according to claim 7, characterized in that: A delivery frame (31) is installed on the right side surface of the heating frame (26). A limiting block (32) is arranged on the top surface of the delivery frame (31), and there are two groups of the limiting blocks (32), and the installation positions of the two groups of the limiting blocks (32) are symmetric to each other.

10. A preparation method of a boron nitride-containing thermal conductive composite material according to any one of claims 1-9, characterized in that: S1. Mix and perform ultrasonic operation on boron nitride powder and isopropyl alcohol IPA solvent; S2. The obtained solution is evenly sprayed on the surface of a 70 °C polyurethane hot melt adhesive web through a spray gun; S3. Hot press the reticular membrane at a hot press temperature of 135 °C and a pressure of 6 MPa; preheat for 7 min during hot pressing, the hot press time is 8 min, and the cooling time is 5 min; S4. Obtain the thermal conductive composite material.

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