A kind of manufacturing equipment and manufacturing process of thermal conductive silicone grease

Abstract

The present invention discloses a manufacturing device and a manufacturing process of thermal conductive silicone grease, aiming to provide a manufacturing device and a manufacturing process of thermal conductive silicone grease with good stirring effect and sufficient mixing. It comprises a reactor, the reactor is rotatably connected with a stirring assembly, the stirring assembly is provided with a stirring rod and a plurality of stirring blades connected to the stirring rod, the plurality of stirring blades are arranged in layers up and down, a defoaming filter plate that can slide up and down is provided between the stirring blades of adjacent layers, a filling groove and a plurality of air guide holes are provided on the upper part of the stirring rod, the air guide holes are externally connected with a vacuum pump, and an electric heating rod group with adjustable heating area is provided inside the stirring blade. The beneficial effects of the present invention are: ensuring that the process requirements are met during stirring and mixing, and ensuring the stirring effect and sufficient mixing.

Description

Technical Field

[0001] The present invention relates to the technical field related to the production of thermal conductive silicone grease, and in particular to a production device and a production process of thermal conductive silicone grease. Background Art

[0002] Thermal grease, commonly known as "thermal paste" or "heat dissipation paste", is a paste-like, efficient heat dissipation material. It is usually filled between the bracket of the LED light source and the aluminum substrate or between the aluminum substrate and the heat dissipation shell. It has very good fluidity and can fully moisturize and penetrate into the surfaces of the two materials that need to be heat-conducted, thereby forming a very low thermal resistance interface, which is more efficient than the heat conduction of air between the contact surface of the LED light source and the heat sink. From the basic characteristics, silicone grease is generally a white or other color paste made of special silicone oil as the base oil, new metal oxides as fillers, and a variety of functional additives. Thermal grease has excellent thermal conductivity, electrical insulation, stability in use, high and low temperature resistance, etc. It is currently a commonly used thermal conductive material for high-power LED lamps. During processing, it is generally prepared by stirring. The existing stirring equipment makes the stirring effect poor, resulting in poor quality of the prepared thermal grease.

[0003] The Chinese patent application publication number is CN 112724677 A, and the application publication date is 2021.04.30. It discloses a dopamine-modified boron nitride thermal grease, which is made by the following steps: (1) Preparation of dopamine-modified BN, BN-PDA: prepare a dopamine hydrochloride aqueous solution, add trishydroxymethylaminomethane powder, adjust the solution pH to alkaline, then add boron nitride powder, after ultrasonication and stirring, filter, wash with deionized water several times, and finally freeze-dry to obtain BN-PDA powder; (2) Preparation of BN-PDA thermal grease: weigh BN-PDA powder and silicone oil, mix them, place them in a ball mill, take out the sample after ball milling, vacuum degas, and obtain BN-PDA thermal grease. This scheme uses dopamine to modify boron nitride, so that the thermal conductivity is improved, but there are limitations to improving the thermal conductivity only by changing the composition.

[0004] Therefore, it is necessary to design a thermal grease production device and a production process thereof to improve the stirring effect and thus improve the thermal conductivity. Summary of the invention

[0005] In order to overcome the disadvantage of poor stirring effect of the stirring device in the prior art, the present invention provides a manufacturing device and a manufacturing process of thermal conductive silicone grease with good stirring effect and sufficient mixing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for making thermal grease comprises a reactor, wherein the reactor is rotatably connected to a stirring assembly, wherein the stirring assembly is provided with a stirring rod and a plurality of stirring blades connected to the stirring rod, wherein the plurality of stirring blades are arranged in upper and lower layers, and a defoaming filter plate which can slide up and down is provided between the stirring blades in adjacent layers, a filling groove and a plurality of air guide holes are provided on the upper part of the stirring rod, a vacuum pump is externally connected to the air guide holes, and an electric heating rod group with an adjustable heating area is provided inside the stirring blades.

[0008] The reactor is provided with a stirring assembly, which can rotate in the reactor. The stirring assembly is composed of a stirring rod and a stirring blade. The stirring blade stirs the materials in the reactor by rotating, so that the materials are fully mixed. The stirring blades are arranged in the form of upper and lower layers. A defoaming filter plate is arranged between the stirring blades of the two adjacent layers. The defoaming filter plate is a filter plate with a small mesh. The defoaming filter plate can slide up and down. By sliding up and down, the bubbles generated during the stirring process can be defoamed to ensure the stirring effect and fully mixed. A filling groove and an air guide hole are arranged on the upper part of the stirring rod. The air guide hole is connected to a vacuum pump to evacuate the vacuum environment in the reactor to ensure the mixing effect. The filling groove is used to add thermally conductive modified fillers during the stirring process to fully mix the components of the thermally conductive silicone grease and ensure the good performance of the manufactured thermally conductive silicone grease. An electric heating rod group is arranged inside the stirring blade, wherein the electric heating rod group can adjust the heating area to ensure that the temperature can be adjusted during the heating process, so that the mixing is carried out under the stability of the process requirements, and the stirring and mixing effect is good.

[0009] Preferably, the upper end of the stirring rod extends out of the reactor and is sleeved with a gear 1, the top outer surface of the reactor is connected with a rotating motor 1, the rotating motor 1 is connected with a gear 2, and the gear 1 is meshed with the gear 2. The rotating motor 1 is fixedly connected to the top outer surface of the reactor, the rotating motor 1 is connected with the gear 2, and the gear 2 is meshed with the gear 1 connected to the stirring rod, ensuring that the rotation of the rotating motor 1 can drive the rotation of the stirring rod, thereby ensuring the stirring and mixing effect.

[0010] Preferably, an annular feeding groove is provided on the top of the stirring rod, the outer inner wall of the feeding groove is tapered, the filling groove is an arc groove, the filling groove is arranged obliquely, and the feeding groove is connected with the filling groove. The feeding groove is connected with the filling groove, and the feeding groove is tapered, which is convenient for filling operation during the stirring process and ensures the stirring and mixing effect.

[0011] Preferably, an air guide tube is provided on the upper part of the stirring rod, one end of the air guide tube is connected to the air guide hole, and the other end of the air guide tube is connected to the vacuum pump. The vacuum pump is connected to the air guide hole through the air guide tube, so that the stirring operation is ensured to be carried out under the vacuum state required by the process, so that the stirring and mixing effect is good.

[0012] Preferably, a mounting groove is provided inside the middle section of the stirring rod, a sliding groove is provided on the outer side wall of the middle section of the stirring rod, a clearance hole is provided on the top side wall of the sliding groove, the clearance hole is arc-shaped and connected to the mounting groove, a telescopic cylinder 1 is connected to the top surface of the mounting groove, the telescopic cylinder 1 is connected to a connecting plate, the connecting plate is slidably connected to the clearance hole, the lower end of the connecting plate is connected to a sliding ring, the sliding ring is slidably sleeved with the sliding groove, and the sliding ring is connected to the defoaming filter plate. The mounting groove is used to install the telescopic cylinder 1, an annular sliding groove is provided on the side wall of the stirring rod, the sliding groove is connected to the mounting groove through the clearance hole, the clearance hole is slidably sleeved with the connecting plate, the end of the connecting plate is connected to the sliding ring, and the sliding ring is connected to the defoaming filter plate. During the stirring process, the defoaming filter plate moves up and down to defoam the material in the reactor, to ensure that there are no bubbles in the stirring and mixing, and to ensure a good stirring effect and sufficient mixing.

[0013] Preferably, the stirring blade is arranged obliquely with the stirring rod, and a plurality of connecting grooves are arranged in parallel inside the stirring blade, one end of the connecting groove is connected to a rotating groove, the electric heating rod group is placed in the connecting groove, the rotating groove is connected to a conductive rod, and the conductive rod is connected to the electric heating rod group. The stirring blade is connected obliquely with the stirring rod, which is convenient for improving the stirring effect during stirring. The plurality of connecting grooves arranged in parallel inside the stirring blade, the ends of the connecting grooves are connected to the rotating groove, the electric heating rod group is installed in the connecting groove, the rotating groove is connected to the conductive rod, and the conductive rod is connected to the electric heating rod group. After power is turned on, a heating effect can be achieved, and the stirred material can be heated during the stirring process, so that the stirring effect is improved and the mixing effect is better.

[0014] Preferably, the electric heating rod group includes a plurality of electric heating rods, the ends of the electric heating rods are provided with conductive contacts, the conductive rods are provided with a plurality of circular contacts and a plurality of semicircular contacts, the circular contacts and the semicircular contacts are arranged staggered with equal spacing, and the circular contacts and the semicircular contacts correspond to the conductive contacts respectively. The circular contacts and the semicircular contacts arranged on the conductive rods are arranged staggered, and the number of connections between the conductive rods and the electric heating rods is achieved by rotating the angle of the conductive rods, thereby achieving control of the heating area, so as to achieve control of the heating efficiency and the temperature rise, ensure the influence of the temperature during the stirring process on the stirring effect, and ensure a good stirring effect and sufficient mixing.

[0015] Preferably, the end of the conductive rod is connected to a rotating motor 2, the rotating shaft end of the rotating motor 2 is connected to the conductive rod, and the other end of the rotating motor 2 is connected to the rotating slot. The rotating shaft end of the rotating motor 2 is connected to the conductive rod, so that the rotating motor 2 can control the rotation of the conductive rod, adjust the heating area, and further adjust the stirring effect.

[0016] Preferably, the stirring blade is provided with a plurality of paving protrusions, the cross section of the paving protrusions is arc-shaped, and the paving protrusions correspond to the connecting grooves. The paving protrusions provided on the stirring blade play a role in increasing the heating area, and can further increase the turbulence effect during the stirring process, thereby improving the stirring effect.

[0017] A preparation process of thermal conductive silicone grease, the steps are as follows:

[0018] S1. Add the required silicone oil and additives into the reactor in proportion and stir;

[0019] S2. After a certain period of time, the electric heating rod is powered on to raise the temperature to 50-80℃;

[0020] S3. Add an appropriate amount of thermally conductive modified filler from the feed tank, start the vacuum pump, evacuate the reactor, and continue stirring for 60 minutes to complete the preparation of the thermally conductive silicone grease required by the process.

[0021] Add silicone oil and additives into the reactor according to the proportion required by the process, and start the rotating motor to stir. After a certain period of time, the electric heating rod is energized to heat the silicone oil and additives to meet the process requirements. When the temperature is heated to 50-80℃, add an appropriate amount of thermally conductive modified filler from the feed tank, and the thermally conductive modified filler enters the reactor from the filler tank. At the same time, start the vacuum pump, evacuate the reactor and maintain the vacuum state, stir for 60 minutes, so that the silicone oil, additives and thermally conductive modified filler are fully stirred and mixed to ensure the mixing effect and achieve the thermal conductive silicone grease required by production.

[0022] The beneficial effects of the present invention are as follows: a defoaming filter plate is arranged between adjacent stirring blade layers, and the defoaming filter plate slides up and down to defoam the bubbles generated during the stirring process, thereby ensuring the stirring effect and achieving sufficient mixing; an external vacuum pump is connected to the air guide hole to evacuate the air, thereby creating a vacuum environment in the reactor, meeting process requirements and ensuring the mixing effect; the number of connections between the conductive rod and the electric heating rod can be controlled by rotating the conductive rod, thereby controlling the heating area to control the heating effect, ensuring that the temperature meets the process requirements during stirring and mixing, and at the same time matching the temperature rise rate with the stirring time to ensure the stirring effect and sufficient mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic view of the present invention;

[0024] Figure 2 is a cross-sectional view of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged view at A in the middle;

[0026] Figure 4 is a three-dimensional view of the stirring assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the arrangement of the electric heating rod group in the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the conductive rod in the present invention.

[0029] In the accompanying drawings,

[0030] 1. Reactor, 2. Stirring rod, 3. Stirring blade, 4. Defoaming filter plate, 5. Vacuum pump, 6. Electric heating rod group, 7. Conductive rod, 10. Rotating motor 1, 11. Gear 2, 20. Filling slot, 21. Air guide hole, 22. Gear 1, 23. Feeding slot, 24. Air guide pipe, 25. Mounting slot, 26. Sliding slot, 27. Make way hole, 28. Telescopic cylinder 1, 29. Connecting plate, 30. Connecting slot, 31. Rotating slot, 32. Make way protrusion, 40. Sliding ring, 60. Electric heating rod, 61. Conductive contact, 70. Circular contact piece, 71. Semicircular contact piece, 72. Rotating motor 2. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement of the parts, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0035] Embodiment 1, as Figure 1-6 As shown, a thermal grease manufacturing device includes a reactor 1, which is rotatably connected to a stirring assembly. The stirring assembly is provided with a stirring rod 2 and a plurality of stirring blades 3 connected to the stirring rod 2, the plurality of stirring blades 3 are arranged in layers, and a defoaming filter plate 4 that can slide up and down is provided between the stirring blades 3 of adjacent layers. A filling groove 20 and a plurality of air guide holes 21 are provided on the upper part of the stirring rod 2. The air guide holes 21 are externally connected to a vacuum pump 5. An electric heating rod group 6 with an adjustable heating area is provided inside the stirring blade 3.

[0036] The upper end of the stirring rod 2 extends out of the reactor 1 and is sleeved with a gear 1 22. The top outer surface of the reactor 1 is connected with a rotating motor 10. The rotating motor 10 is connected with a gear 2 11. The gear 1 22 meshes with the gear 2 11.

[0037] The top of the stirring rod 2 is provided with an annular feed groove 23. The outer inner wall of the feed groove 23 is conical. The filling groove 20 is an arc groove. The filling groove 20 is arranged obliquely. The feed groove 23 is connected with the filling groove 20.

[0038] An air guide tube 24 is provided on the upper part of the stirring rod 2. One end of the air guide tube 24 is communicated with the air guide hole 21. The other end of the air guide tube 24 is communicated with the vacuum pump 5.

[0039] A mounting groove 25 is provided inside the middle section of the stirring rod 2. A sliding groove 26 is provided on the outer side wall of the middle section of the stirring rod 2. A clearance hole 27 is provided on the top side wall of the sliding groove 26. The clearance hole 27 is arc-shaped and communicates with the mounting groove 25. A telescopic cylinder 28 is connected to the top surface of the mounting groove 25. A connecting plate 29 is connected to the telescopic cylinder 28. The connecting plate 29 is slidably connected to the clearance hole 27. A sliding ring 40 is connected to the lower end of the connecting plate 29. The sliding ring 40 is slidably sleeved with the sliding groove 26. The sliding ring 40 is connected to the defoaming filter plate 4. The defoaming filter plate 4 is a plate with a plurality of evenly arranged small holes. The defoaming filter plate 4 will eliminate bubbles in the stirred material mixture during the up and down movement. At the same time, during the defoaming process, the defoaming filter plate 4 will also stir the silicone oil and additives and other materials in the reactor 1 in the up and down directions, and also play a certain stirring role, so that the stirring effect is good and the mixing is further sufficient.

[0040] The stirring blade 3 is arranged obliquely with the stirring rod 2. A plurality of connecting grooves 30 are arranged in parallel inside the stirring blade 3. One end of the connecting groove 30 is connected to a rotating groove 31. The electric heating rod group 6 is placed in the connecting groove 30. The rotating groove 31 is connected to the conductive rod 7. The conductive rod 7 is connected to the electric heating rod group 6. The conductive rod 7 is externally connected to a power supply device to supply power to the electric heating rod group 6. The conductive rod 7 is made of copper to ensure the conductive effect.

[0041] The electric heating rod group 6 includes a plurality of electric heating rods 60. The ends of the electric heating rods 60 are provided with conductive contacts 61. The conductive rod 7 is provided with a plurality of circular contact pieces 70 and a plurality of semicircular contact pieces 71. The circular contact pieces 70 and the semicircular contact pieces 71 are arranged alternately at equal intervals. The circular contact pieces 71 and the semicircular contact pieces 71 correspond to the conductive contacts 61, respectively.

[0042] The end of the conductive rod 7 is connected to a rotating motor 2 72. The rotating shaft end of the rotating motor 2 72 is connected to the conductive rod 7. The other end of the rotating motor 2 72 is connected to the rotating slot 31.

[0043] The stirring blade 3 is provided with a plurality of paving protrusions 32. The paving protrusions 32 have an arc-shaped cross section and correspond to the connecting grooves 30.

[0044] A preparation process of thermal conductive silicone grease, the steps are as follows:

[0045] S1, put the required silicone oil and additives into the reactor 1 according to the proportion, and stir;

[0046] S2. After a certain period of time, the electric heating rod 60 is energized to increase the temperature to 50-80°C;

[0047] S3, add a proper amount of thermally conductive modified filler from the feed tank 23, start the vacuum pump 5, evacuate the reactor 1, continue stirring for 60 minutes, and complete the production of thermally conductive silicone grease required by the process

[0048] The working principle of the present invention is: Figure 1-6 As described above, the required silicone oil and additives are put into the reactor 1 in proportion, and the top cover of the reactor 1 is closed. The stirring assembly is placed in the reactor 1, and the stirring assembly includes a stirring rod 2 and a stirring blade 3, wherein the stirring blade 3 is arranged on the stirring rod 2 in upper and lower layers, the stirring rod 2 extends out of the top surface of the reactor 1, and a gear 22 is sleeved on the extended end of the stirring rod 2. A rotating motor 10 is arranged on the top outer surface of the reactor 1, and a gear 2 11 is connected to the rotating shaft end of the rotating motor 10, and the gear 22 is meshed with the gear 2 11. By starting the rotating motor 10, the stirring rod 2 can drive the stirring blade 3 to rotate, thereby realizing the stirring of the silicone oil and additives put into the reactor 1. A plurality of parallel connection grooves 30 are arranged inside the stirring blade 3, and a rotating groove 31 is arranged at the end of the connecting groove 30, and the rotating groove 31 is connected to the connecting groove 30. The electric heating rod group 6 includes a plurality of electric heating rods 60, which are installed in the connecting groove 30. A rotating motor 2 72 is installed on the side wall inside the rotating groove 31. The rotating shaft end of the rotating motor 2 72 is connected to a conductive rod 7. The conductive rod 7 is provided with staggered circular contact pieces 70 and semicircular contact pieces 71. The circular contact pieces 70 and the semicircular contact pieces 71 correspond to the conductive contacts 61 provided at the ends of the electric heating rods 60 in the connecting groove 30, respectively. When the heating area to be heated is a small area, the rotating motor 2 72 is rotated to rotate the semicircular contact pieces 71 to not contact the electric heating rods 60, so that some of the electric heating rods 60 are in an energized heating state; when the heating area to be heated is a large area, the rotating motor 2 72 is rotated to rotate the semicircular contact pieces 71 to contact the electric heating rods 60, so that all the electric heating rods 60 are in an energized heating state. The heating efficiency is controlled by controlling the number of connections of the electric heating rod 60, so that the process requirements are met when the silicone oil and the additive are heated and stirred. At the same time, the processing efficiency and the stirring effect can be improved by the speed of temperature increase. After the temperature reaches 50-80°C, the thermally conductive modified filler is put into the feed groove 23 set on the top of the stirring rod 2. The feed groove 23 is connected with the filler groove 20 set on the side wall of the stirring rod 2, and is discharged from the filler groove 20 and enters the reactor 1 to complete the addition of the thermally conductive modified filler. After the addition of the thermally conductive modified filler is completed, the vacuum pump 5 installed on the outside of the top of the reactor 1 is started. The vacuum pump 5 is connected to the air guide hole 21 set on the upper part of the stirring rod 2 through the air guide pipe 24 to perform a vacuum operation, and the subsequent stirring is carried out in a vacuum environment. Stirring in a vacuum environment for 60 minutes can complete the production of thermally conductive silicone grease that meets the process requirements.

[0049] Embodiment 2, as Figure 2 , 4As shown, the stirring blades 3 connected to the stirring rod 2 are arranged in the form of several upper and lower layers, and a defoaming filter plate 4 is arranged between the stirring blades 3 of adjacent layers. An annular sliding groove 26 is arranged on the middle side wall of the stirring rod 2, and a clearance hole 27 is arranged on the top side of the sliding groove 26. In the upper part of the clearance hole 27, a mounting groove 25 is arranged in the stirring rod 2, and a telescopic cylinder 28 is installed in the mounting groove 25. The telescopic end of the telescopic cylinder 28 is connected to a connecting plate 29, wherein the connecting plate 29 is slidably sleeved with the clearance hole 27, and a sliding ring 40 is connected below the connecting plate 29, and the sliding ring 40 is connected to the defoaming filter plate 4. During the stirring process, the telescopic cylinder 28 performs a telescopic action, driving the defoaming filter plate 4 to slide up and down, realizing the defoaming treatment of the stirring material, and ensuring the stirring effect and sufficient mixing.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for preparing thermally conductive silicone grease, comprising a reaction kettle (1), characterized in that: The reaction kettle (1) is rotatably connected to a stirring assembly, wherein the stirring assembly is provided with a stirring rod (2) and a plurality of stirring blades (3) connected to the stirring rod (2), the plurality of stirring blades (3) are arranged in layers, and a defoaming filter plate (4) that can slide up and down is provided between the stirring blades (3) in adjacent layers, a filling groove (20) and a plurality of air guide holes (21) are provided on the upper part of the stirring rod (2), the air guide holes (21) are externally connected to a vacuum pump (5), an electric heating rod group (6) with an adjustable heating area is provided inside the stirring blade (3), an annular feeding groove (23) is provided on the top of the stirring rod (2), the outer inner wall of the feeding groove (23) is conical, the filling groove (20) is an arc groove, the filling groove (20) is arranged obliquely, the feeding groove (23) is connected to the filling groove (20), and the stirring blades (20) are arranged in an inclined manner. The blade (3) and the stirring rod (2) are arranged obliquely, a plurality of connecting grooves (30) are arranged inside the stirring blade (3), the plurality of connecting grooves (30) are arranged in parallel, one end of the connecting groove (30) is connected to a rotating groove (31), the electric heating rod group (6) is placed in the connecting groove (30), the rotating groove (31) is connected to a conductive rod (7), the conductive rod (7) is connected to the electric heating rod group (6), the electric heating rod group (6) includes a plurality of electric heating rods (60), the ends of the electric heating rods (60) are provided with conductive contacts (61), the conductive rods (7) are provided with a plurality of circular contact pieces (70) and a plurality of semicircular contact pieces (71), the circular contact pieces (70) and the semicircular contact pieces (71) are arranged alternately at equal intervals, and the circular contact pieces (70) and the semicircular contact pieces (71) correspond to the conductive contacts (61) respectively; The steps are as follows: S1. Add the required silicone oil and additives into the reaction kettle (1) according to the proportion and stir; S2. After a certain period of time, the electric heating rod (60) is energized to raise the temperature to 50-80°C; S3. Add an appropriate amount of thermally conductive modified filler from the feed tank (23), start the vacuum pump (5), evacuate the reactor (1), and continue stirring for 60 minutes to complete the preparation of the thermally conductive silicone grease required by the process.

2. A process for preparing thermally conductive silicone grease according to claim 1, characterized in that: The upper end of the stirring rod (2) extends out of the reaction kettle (1) and is sleeved with a gear 1 (22); the top outer surface of the reaction kettle (1) is connected to a rotating motor 1 (10); the rotating motor 1 (10) is connected to a gear 2 (11); the gear 1 (22) meshes with the gear 2 (11).

3. The preparation process of a thermal conductive silicone grease according to claim 1, characterized in that: An air guide tube (24) is provided on the upper part of the stirring rod (2); one end of the air guide tube (24) is connected to the air guide hole (21), and the other end of the air guide tube (24) is connected to the vacuum pump (5).

4. The preparation process of a thermal conductive silicone grease according to claim 1, characterized in that: The middle section of the stirring rod (2) is provided with a mounting groove (25), the outer wall of the middle section of the stirring rod (2) is provided with a sliding groove (26), the top side wall of the sliding groove (26) is provided with a clearance hole (27), the clearance hole (27) is arc-shaped and communicates with the mounting groove (25), the top surface of the mounting groove (25) is connected with a telescopic cylinder 1 (28), the telescopic cylinder 1 (28) is connected with a connecting plate (29), the connecting plate (29) is slidably connected with the clearance hole (27), the lower end of the connecting plate (29) is connected with a sliding ring (40), the sliding ring (40) is slidably sleeved with the sliding groove (26), and the sliding ring (40) is connected to the defoaming filter plate (4).

5. The preparation process of a thermal conductive silicone grease according to claim 1, characterized in that: The end of the conductive rod (7) is connected to a second rotating motor (72), the rotating shaft end of the second rotating motor (72) is connected to the conductive rod (7), and the other end of the second rotating motor (72) is connected to the rotating slot (31).

6. The preparation process of a thermal conductive silicone grease according to claim 1, characterized in that: The stirring blade (3) is provided with a plurality of paving protrusions (32), the cross section of the paving protrusions (32) is arc-shaped, and the paving protrusions (32) correspond to the connecting grooves (30).

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