Anti-aging heat-conducting gel and preparation method thereof

Abstract

The invention discloses an anti-aging heat-conducting gel and a preparation method thereof, and relates to the technical field of heat-conducting gels, the heat-conducting gel is composed of a component A and a component B. The component A comprises polydimethylsiloxane, boron nitride heat-conducting powder, silicon carbide nanowires, an organic tin catalyst and a silane coupling agent; the component B is prepared from polydimethylsiloxane, boron nitride heat conduction powder, silicon carbide nanowires, hydrogen-containing polymethylsiloxane and an antioxidant; in the invention, the boron nitride heat-conducting powder can be combined with the silicon carbide nanowires to construct a three-dimensional heat-conducting network, so that the interface heat resistance is remarkably reduced, the high-efficiency aging resistance is realized, and in the preparation process, the component A and the component B are simultaneously mixed and prepared through a high-speed mixer and are matched with an internal multi-stage stirring assembly, so that the heat-conducting performance is improved. Therefore, the component A and the component B are mixed and prepared at the same time, and high-efficiency support is provided for subsequent mixing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal conductive gels, and specifically to an anti-aging thermal conductive gel and a preparation method thereof. Background Art

[0002] The reliability of electronic devices has an exponential relationship with their operating temperature. Therefore, a small difference in operating temperature may lead to a significant shortening of the device life. Data shows that more than 50% of the failures of electronic devices are caused by temperatures exceeding the limit. Moreover, improvements in size and performance may result in more heat being generated in a smaller space. To ensure the normal operation of the device, it is necessary to remove excess heat as quickly and effectively as possible to maintain the operating temperature. To solve this problem, a thermal conductive interface material is usually filled between the heat source and the heat sink.

[0003] Currently, the commonly used thermal conductive interface materials include thermal conductive silicone grease, thermal conductive pads, and thermal conductive gels, etc. Thermal conductive pads are obtained by chemically cross-linking and curing to obtain a whole thermal conductive product and then cutting and shaping it. Due to its single thickness, it is increasingly unable to meet the market demand; while thermal conductive silicone grease has no cross-linking and curing reaction, and it is very easy to form oil-powder separation after long-term use; thermal conductive gels better make up for the shortcomings of thermal conductive silicone grease and thermal conductive pads, and also have the advantages of both. Its soft and flexible gel structure can fill the gap between the uneven surface of the heat source and the radiator, providing a reliable heat dissipation path for electronic devices in various complex environments.

[0004] There is a prior application No. CN202010878393.1 for a thermal conductive gel and a preparation method thereof. The components of the thermal conductive gel include metal hybrid thermal conductive fillers. The metal hybrid thermal conductive fillers are nano-metal fillers loaded on the surface of metal fillers. The metal hybrid thermal conductive fillers can reduce the interfacial thermal resistance between the metal thermal conductive fillers, enabling the thermal conductive gel to have a high thermal conductivity. However, it does not mention the anti-aging property of the thermal conductive gel, resulting in the above thermal conductive gel being prone to aging phenomena within a certain temperature range, which will have a certain impact on the improvement of the device service life and thermal conductivity.

[0005] A current low-volatile oil-free film thermal conductive gel with the application number CN202310504517.3 and its preparation method relate to the field of thermal conductive gels. The low-volatile oil-free film thermal conductive gel is composed of the following raw materials in weight percentages: 3-14% of pretreated resin, 85-96% of thermal conductive filler, and 0.05-1% of coupling agent; each weight part of the pretreated resin is composed of the following raw materials in weight percentages: 93-97% of vinyl silicone oil, 2-6% of hydrogen-containing silicone oil, 0.1-1% of catalyst, and 0.2-0.4% of inhibitor; wherein, the pretreatment method of the pretreated resin is: according to the ratio, put the vinyl silicone oil, hydrogen-containing silicone oil, and inhibitor into a container and disperse them evenly, then add the catalyst, and continuously stir at 140-155 °C under vacuum conditions for 6.5-8 h. At the same time, keep the top temperature of the container at 23-25 °C. The thermal conductive gel in this application has low-volatile small-molecule substances, effectively reducing the appearance of oil films. Among them, the components are stirred and mixed through the stirring rod arranged inside the container, and the stirring position is single, which has certain limitations on the stirring and mixing efficiency and effect of the components. At the same time, the simultaneous stirring and mixing effect of multiple components is not very efficient, which has a certain impact on the subsequent mixing and preparation efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide an aging-resistant thermal conductive gel and its preparation method to solve the problems proposed in the above background technology.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] In the first aspect, the present application provides an aging-resistant thermal conductive gel, which is composed of component A and component B; by mass, the raw materials of component A and component B are as follows:

[0009] Component A:

[0010] Polydimethylsiloxane: 50-70%

[0011] Boron nitride thermal conductive powder: 20-35%

[0012] Silicon carbide nanowires: 5-10%

[0013] Organotin catalyst: 0.5-2%

[0014] Silane coupling agent: 1-3%;

[0015] Component B:

[0016] Polydimethylsiloxane: 50-60%

[0017] Boron nitride thermal conductive powder: 20-35%

[0018] Silicon carbide nanowires: 5-10%

[0019] Hydrogen-containing polymethylsiloxane: 1-7%

[0020] Antioxidant: 1-3%.

[0021] Preferably, the polydimethylsiloxane is an α,ω-dihydroxy-terminated linear structure with a viscosity range of 5000-10000 mPa·s (25 °C) and a molecular weight of 200,000-500,000.

[0022] Preferably, the silane coupling agent can be composed of one or more of aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

[0023] Preferably, the antioxidant can be composed of one or more of dibutyltin dilaurate, butylhydroxytoluene, phenyl-α-naphthylamine, p-phenylenediamine derivatives, and tris(2,4-di-tert-butylphenyl) phosphite.

[0024] In a second aspect, the present application also provides a method for preparing an anti-aging thermal conductive gel, comprising the following steps:

[0025] S1. Mixing of component A: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, and silane coupling agent into a high-speed mixer, stir and mix at a speed of 2000-3000 rpm for 20-30 minutes to fully disperse each component, then add an organotin catalyst and continue stirring for 10-15 minutes to obtain component A in the form of a semi-fluid paste.

[0026] S2. Mixing of component B: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, silane coupling agent, and ultraviolet absorber into a high-speed mixer, mix at the same stirring speed and time, then add hydrogen-containing polymethylsiloxane and antioxidant and continue stirring for 10-15 minutes to obtain component B in the form of a semi-fluid paste.

[0027] S3. Mixing and curing: Add the obtained component A mixture and component B mixture into a planetary mixer according to a mass ratio of 1:1, stir and mix at a speed of 100-500 rpm for 5-10 minutes, pour the mixed gel into a mold, place it in a vacuum oven, degas at a pressure of -0.095 to -0.1 MPa for 15-30 minutes to remove air bubbles, and cure at 80-100 °C for 1-2 hours. After cooling to room temperature, demold to obtain the anti-aging thermal conductive gel.

[0028] Preferably, the high-speed mixer used in the steps S1 and S2 includes a bracket. A control box is provided on the left side of the top of the bracket. The first mixing cylinder and the second mixing cylinder are respectively installed on both sides of the upper end of the bracket. Feed pipes are installed at the rear sides of the upper ends of the first mixing cylinder and the second mixing cylinder. The first discharge pipe and the second discharge pipe are respectively installed at the lower ends of the first mixing cylinder and the second mixing cylinder. A multi-stage stirring device is provided on the top of the first mixing cylinder and the second mixing cylinder.

[0029] Preferably, the multi-stage stirring device includes a motor. The motor is installed in the middle of the bidirectional transmission structure. The bidirectional transmission structure is connected to the tops of the first mixing cylinder and the second mixing cylinder. The lower ends of both sides of the bidirectional transmission structure are respectively butted with a first stirring component. A second stirring component is arranged outside the first stirring component. The first stirring component and the second stirring component are both installed inside the first mixing cylinder or the second mixing cylinder.

[0030] Preferably, the bidirectional transmission structure includes a support frame. The support frame is connected to the tops of the first mixing cylinder and the second mixing cylinder. The lower end of the middle of the support frame is connected to the motor. The main bevel gear is butted at the output end of the top of the motor. The first bevel gears are meshed on both sides of the upper end of the main bevel gear. One side of the middle of the first bevel gear is butted with a docking rod. The docking rod is butted with a second bevel gear on the side far away from the first bevel gear. The lower end of the second bevel gear is meshed with a third bevel gear. And the lower end of the middle of the third bevel gear is butted with the first stirring component.

[0031] Preferably, the first stirring component includes a rotating shaft. The upper end of the rotating shaft is connected to the third bevel gear. And the lower end of the rotating shaft is connected to a turntable. A toothed disc is arranged on the top of the turntable. The first fixed cylinder is fixedly arranged on the top of the toothed disc. And the top of the first fixed cylinder is connected to the upper end of the first mixing cylinder or the second mixing cylinder. The first gear is rotatably installed on the outer side of the upper end of the turntable. And the first gear is meshed with the outside of the toothed disc. The second gear is butted at the lower end of the first gear. The third gear is meshed on the outside of the second gear. And the upper end of the third gear is rotatably connected to the turntable. The rocker arm is butted at the lower end of the third gear. And a stirring rod is installed on one side of the rocker arm.

[0032] Preferably, the second stirring assembly includes a docking plate which is placed on the upper end of the toothed disc. The bottom of the side of the docking plate is connected to the turntable. An active wheel is installed inside the side of the docking plate, and the upper end of the active wheel is connected to the first gear. A belt is connected to the outside of the active wheel in a transmission manner, and the other end of the belt is connected to a driven wheel in a transmission manner. A rotating rod is butted at the lower end of the driven wheel, a connecting rod is connected to the bottom of the rotating rod, a stirring blade is installed at the bottom of the connecting rod, and a transmission bevel gear is installed on the outer side of the upper end of the connecting rod. A convex shaft is inserted into the outside of the transmission bevel gear, and the convex shaft is inserted into the connecting ring. A fixed bevel gear is engaged with the upper end of the transmission bevel gear, a second fixed cylinder is fixedly provided at the upper end of the fixed bevel gear, and the top of the second fixed cylinder is connected to the bottom of the docking plate. The outside of the connecting ring is connected to the connecting cylinder, and a connecting column is inserted into the outside of the connecting cylinder.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] The thermal conductive gel of the present invention is composed of component A and component B raw materials as follows: Component A: polydimethylsiloxane 50 - 70%, boron nitride thermally conductive powder 25 - 40%, silicon carbide nanowires 5 - 10%, organotin catalyst 0.5 - 1.5%, silane coupling agent 1 - 3%; Component B: polydimethylsiloxane 50 - 70%, boron nitride thermally conductive powder 25 - 40%, silicon carbide nanowires 5 - 10%, hydrogen-containing polymethylsiloxane 10 - 20%, antioxidant 1 - 3%; wherein, the boron nitride thermally conductive powder can combine with the silicon carbide nanowires to construct a three-dimensional thermal conductive network, significantly reducing the interface thermal resistance, making it have high efficient anti-aging property. During the preparation process, the mixing of component A and component B is carried out simultaneously by a high-speed mixer, and through the provided multi-stage stirring assembly, the multi-stage stirring and mixing of the materials are carried out to accelerate the simultaneous mixing efficiency of component A and component B and provide efficient support for the subsequent mixing efficiency.

[0035] The setting of the bidirectional transmission structure means that under the operation of the main bevel gear, the first sub-bevel gears meshing on both sides of the upper end of the main bevel gear will rotate simultaneously, and through the docking rod provided in the middle, the rotation of the second sub-bevel gear is realized. Thus, the third sub-bevel gear meshing at the lower end of the second sub-bevel gear will accordingly realize the linkage operation of the first stirring assemblies inside the first mixing cylinder and the second mixing cylinder.

[0036] The setting of the first stirring assembly means that when the rotating shaft rotates with the third bevel gear, it can drive the rotating disc connected to the lower end to rotate. The first gears installed on the three sides of the upper end of the rotating disc can revolve accordingly. Each of the revolving first gears can mesh with the fixed toothed disc to perform self-rotation activities. Thus, the second gears connected to the lower ends of the first gears can rotate synchronously, and accordingly drive the externally meshed third gears. So, the rocker arms connected to the lower ends of the third gears can rotate circumferentially, causing the stirring rods connected to the lower ends to rotate and stir. At the same time, with the drive of the revolution, the stirring on each side can move simultaneously, significantly accelerating the stirring and mixing efficiency of the materials, enabling the simultaneous stirring and mixing of component A and component B for preparation.

[0037] The setting of the second stirring assembly means that when the rotating disc rotates, the docking disc can rotate synchronously. Thus, the driving wheels installed inside the sides of the docking disc and connected to the upper ends of the first gears can perform self-rotation and revolution activities simultaneously. And with the effect of belt docking, the driven wheels can rotate synchronously. Therefore, the driven wheels can drive the rotating rods connected to the bottoms to rotate synchronously to meet the linkage of multi-stage stirring activities.

[0038] The setting of the rotating rod, connecting rod and stirring blades means that when the rotating rod rotates with the driven wheel, the connecting rod connected to the bottom can rotate synchronously. Thus, the stirring blades installed at the bottoms of the connecting rods can rotate quickly to perform rapid rotational stirring and mixing activities on the materials.

[0039] The setting of the transmission bevel gear, convex shaft, connecting ring, fixed bevel gear, connecting cylinder and connecting column means that when the connecting rod rotates, it can drive the transmission bevel gear connected to the upper left side to rotate. The moving transmission bevel gear can mesh and transmit with the fixed fixed bevel gear, enabling the whole transmission bevel gear to not only revolve but also rotate. When the transmission bevel gear rotates and revolves, the convex shaft installed on the upper left side of the transmission bevel gear can transmit and cooperate with the circular concave part opened inside the connecting ring through the rotation process. Thus, the connecting ring can move up and down reciprocally. So, the up and down movement of the connecting cylinder can be indirectly realized, causing the connecting column installed outside the connecting cylinder to perform up and down reciprocating movement for stirring and mixing. At the same time, because the lower end of the connecting rod is in limit docking with the connecting cylinder, when the connecting rod rotates, the connecting cylinder in the up and down reciprocating movement state can simultaneously perform rotational activities. Furthermore, the connecting column can not only move up and down reciprocally but also rotate and stir, greatly enhancing its stirring functionality. When the component A and component B materials are simultaneously stirred and mixed, it can meet the multi-stage stirring and mixing processing, greatly accelerating the mixing and preparation efficiency and significantly improving the production and preparation efficiency of the thermal conductive gel. Description of the Drawings

[0040] Figure 1 It is a schematic diagram of the production and preparation process of the thermal conductive gel of the present invention;

[0041] Figure 2 This is a schematic structural diagram of the high-speed mixer of the present invention;

[0042] Figure 3 This is a three-dimensional structural diagram of the multi-stage stirring device of the present invention;

[0043] Figure 4 This is a three-dimensional structural diagram of the two-way transmission structure of the present invention;

[0044] Figure 5 This is a three-dimensional combined structural diagram of the first stirring component and the second stirring component of the present invention;

[0045] Figure 6 This is a three-dimensional structural diagram of the first stirring component of the present invention;

[0046] Figure 7 This is a three-dimensional disassembled structural diagram of the first stirring component of the present invention;

[0047] Figure 8 This is a three-dimensional structural diagram of the second stirring component of the present invention;

[0048] Figure 9 This is a front view of the internal partial structure diagram of the second stirring component of the present invention;

[0049] Figure 10 This is the present invention Figure 9 The enlarged structural diagram at position A in.

[0050] In the figure: support - 1, control box - 2, first mixing cylinder - 3, second mixing cylinder - 4, feed pipe - 5, first discharge pipe - 6, second discharge pipe - 7, multi-stage stirring device - 8, motor - 81, two-way transmission structure - 82, support frame - 821, main bevel gear - 822, first sub-bevel gear - 823, docking rod - 824, second sub-bevel gear - 825, third sub-bevel gear - 826, first stirring component - 83, rotating shaft - 831, turntable - 832, toothed disc - 833, first fixed cylinder - 834, first gear - 835, second gear - 836, third gear - 837, rocker arm - 838, stirring rod - 839, second stirring component - 84, docking disc - 841, driving wheel - 842, belt - 843, driven wheel - 844, rotating rod - 845, connecting rod - 846, stirring blade - 847, transmission bevel gear - 848, convex shaft - 849, connecting ring - 8410, fixed bevel gear - 8411, connecting cylinder - 8412, connecting column - 8413, second fixed cylinder - 8414. Detailed implementation manners

[0051] In order to further explain the technical solution of the present invention, the following will be elaborated in detail through specific embodiments.

[0052] Please refer toFigure 1 , the present invention provides an anti-aging thermal conductive gel, which consists of component A and component B; by mass fraction, the raw material compositions of component A and component B are as follows:

[0053] Component A:

[0054] Polydimethylsiloxane: Select α,ω-dihydroxypolydimethylsiloxane (viscosity 5000 - 10000 mPa·s), with a proportion of 50 - 70%;

[0055] Boron nitride thermal conductive powder: A combination of spherical (5 - 8μm, 60 - 70%) and flaky (10 - 15μm, 30 - 40%) is used, with a proportion of 20 - 35%;

[0056] Silicon carbide nanowires: β-crystalline form (diameter 50 - 80nm, aspect ratio > 100), with a proportion of 5 - 10%;

[0057] Organotin catalyst: Select dibutyltin dilaurate, with a proportion of 0.5 - 2%;

[0058] Silane coupling agent: Select aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, with a proportion of 1 - 3%;

[0059] Component B:

[0060] Polydimethylsiloxane: Select α,ω-dihydroxypolydimethylsiloxane (viscosity 5000 - 10000 mPa·s), with a proportion of 50 - 60%;

[0061] Boron nitride thermal conductive powder: A combination of spherical (5 - 8μm, 60 - 70%) and flaky (10 - 15μm, 30 - 40%) is used, with a proportion of 20 - 35%;

[0062] Silicon carbide nanowires: β-crystalline form (diameter 50 - 80nm, aspect ratio > 100), with a proportion of 5 - 10%;

[0063] Hydrogen-containing polymethylsiloxane: Hydrogen content 0.1 - 0.3%, with a proportion of 1 - 7%;

[0064] Antioxidant: Select a combination of butylated hydroxytoluene and phenyl-α-naphthylamine, with a proportion of 1 - 3%.

[0065] Specifically, the boron nitride thermal conductive powder is a combination of spherical boron nitride and flaky boron nitride, combined with β-silicon carbide nanowires, which can construct a three-dimensional stereoscopic thermal conductive network to significantly reduce the interfacial thermal resistance. Moreover, the nanowires can prevent performance non-uniformity caused by filler sedimentation, and the β-silicon carbide nanowires enhance the continuity of the thermal conductive path by bridging the boron nitride fillers. At the same time, its ultraviolet shielding property reduces the damage of photoaging to the thermal conductive network;

[0066] Antioxidants, through the combination of butylated hydroxytoluene and phenyl-α-naphthylamine, can inhibit the oxidative degradation of silicone matrix through the dual mechanisms of free radical capture and hydroperoxide decomposition; silane coupling agents enhance the filler-matrix interfacial bonding and reduce the propagation of microcracks caused by thermal stress.

[0067] Among them, polydimethylsiloxane has an α,ω-dihydroxy-terminated linear structure, with a viscosity range of 5000 - 10000 mPa·s (25 °C) and a molecular weight of 200,000 - 500,000.

[0068] Among them, the silane coupling agent can be composed of one or more of aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

[0069] Among them, the antioxidant can be composed of one or more of dibutyltin dilaurate, butylated hydroxytoluene, phenyl-α-naphthylamine, p-phenylenediamine derivatives, and tris(2,4-di-tert-butylphenyl) phosphite.

[0070] In addition, the present application also provides a preparation method of an aging-resistant thermal conductive gel, which is characterized by including the following steps:

[0071] S1. Mixing of component A: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, and silane coupling agent into a high-speed mixer, stir and mix at a speed of 2000 - 3000 rpm for 20 - 30 minutes to fully disperse each component, then add an organotin catalyst and continue to stir for 10 - 15 minutes to obtain component A in the form of a semi-fluid paste.

[0072] S2. Mixing of component B: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, silane coupling agent, and ultraviolet absorber into a high-speed mixer, mix at the same stirring speed and time, then add hydrogen-containing polymethylsiloxane and antioxidant, and continue to stir for 10 - 15 minutes to obtain component B in the form of a semi-fluid paste.

[0073] S3. Mixing and curing: Add the obtained component A mixture and component B mixture into a planetary mixer according to a mass ratio of 1:1, stir and mix at a speed of 100 - 500 rpm for 5 - 10 minutes, pour the mixed gel into a mold, place it in a vacuum oven, degas at a pressure of -0.095 to -0.1 MPa for 15 - 30 minutes to remove air bubbles, and cure at 80 - 100 °C for 1 - 2 hours. After cooling to room temperature, demold to obtain the aging-resistant thermal conductive gel.

[0074] Please refer to Figure 2, in this embodiment, the high-speed mixer used in steps S1 and S2 includes a bracket 1. A control box 2 is provided on the left side of the top of the bracket 1. A first mixing cylinder 3 and a second mixing cylinder 4 are respectively installed on both sides of the upper end of the bracket 1. Feeding pipes 5 are installed at the rear sides of the upper ends of the first mixing cylinder 3 and the second mixing cylinder 4. A first discharge pipe 6 and a second discharge pipe 7 are respectively installed at the lower ends of the first mixing cylinder 3 and the second mixing cylinder 4. A multi-stage stirring device 8 is provided at the top of the first mixing cylinder 3 and the second mixing cylinder 4.

[0075] Valves are provided outside both the first discharge pipe 6 and the second discharge pipe 7, which can achieve automatic opening and discharging activities after the stirring and mixing activities are completed, so as to improve the automation of material mixing.

[0076] Specifically, when the A component and the B component need to be mixed and prepared simultaneously, the raw materials composed of the A component and the B component can be respectively poured into the first mixing cylinder 3 and the second mixing cylinder 4 through the feeding pipes 5 correspondingly installed at the rear sides of the upper ends of the first mixing cylinder 3 and the second mixing cylinder 4. During the pouring process of the raw materials, the operation of the multi-stage stirring device 8 installed at the upper ends of the first mixing cylinder 3 and the second mixing cylinder 4 can be realized through the control box 2 provided on the left side of the upper end of the bracket 1, so as to realize the simultaneous multi-stage stirring and mixing of the materials poured into the first mixing cylinder 3 and the second mixing cylinder 4, accelerate the stirring and mixing efficiency of the A component and the B component, and improve the overall mixing and preparation efficiency of the subsequent thermal conductive gel.

[0077] Please refer to Figures 3 - 7 , the multi-stage stirring device 8 in this embodiment includes a motor 81. The motor 81 is installed in the middle of a two-way transmission structure 82. The two-way transmission structure 82 is connected to the tops of the first mixing cylinder 3 and the second mixing cylinder 4. The lower ends of the left and right sides of the two-way transmission structure 82 are respectively butted with first stirring components 83. Second stirring components 84 are installed outside both sides of the first stirring components 83. The first stirring components 83 and the second stirring components 84 are both installed inside the first mixing cylinder 3 or the second mixing cylinder 4.

[0078] Among them, the two-way transmission structure 82 includes a support frame 821. The lower ends of the left and right sides of the support frame 821 are respectively connected to the tops of the first mixing cylinder 3 and the second mixing cylinder 4. The lower end of the middle of the support frame 821 is connected to the motor 81. The top output end of the motor 81 is butted with a main bevel gear 822, and the main bevel gear 822 is located at the upper end of the middle of the support frame 821. First sub-bevel gears 823 are meshed and connected to the left and right sides of the upper end of the main bevel gear 822. A docking rod 824 is horizontally butted on one side of the middle of both sides of the first sub-bevel gears 823, and both docking rods 824 are rotatably connected to the upper end of the support frame 821. A second sub-bevel gear 825 is butted on the side of the docking rod 824 away from the first sub-bevel gear 823. A third sub-bevel gear 826 is meshed and connected to the lower end of the second sub-bevel gear 825, and the lower ends of the middle of both sides of the third sub-bevel gears 826 are butted with the first stirring components 83.

[0079] Among them, the first stirring assembly 83 includes a rotating shaft 831. The rotating shaft 831 is vertically butted against the lower end of the third bevel gear 826, and the lower end of the rotating shaft 831 is fixedly butted with a turntable 832 in a threaded manner. A toothed disc 833 is provided on the top of the turntable 832. The upper end of the toothed disc 833 is fixedly connected with a first fixed cylinder 834, and the top of the first fixed cylinder 834 is connected to the upper end of the first mixing cylinder 3 or the second mixing cylinder 4. Thus, the toothed disc 833 can be in a fixed installation state. Three sides of the upper end of the turntable 832 are rotatably provided with first gears 835, and the three first gears 835 on the sides are all meshed with the outside of the toothed disc 833. The lower end of the first gear 835 is butted with a second gear 836. The outside of the second gear 836 is meshed with a third gear 837, and the upper end of the third gear 837 is rotatably connected to the turntable 832. The lower end of the third gear 837 is butted with a rocker arm 838, and a stirring rod 839 is provided at one end of the rocker arm 838 away from the third gear 837.

[0080] Specifically, when the A-component and B-component materials are respectively poured into the first mixing cylinder 3 and the second mixing cylinder 4, the motor 81 provided in the middle of the lower end of the support frame 821 can be operated to rotate the main bevel gear 822 connected to the top output end of the motor 81. As the main bevel gear 822 rotates, the first bevel gears 823 meshed with the left and right sides of the upper end of the main bevel gear 822 can rotate simultaneously, and synchronously rotate the connecting rod 824 connected in the middle. Thus, the second bevel gear 825 installed on the other side of the connecting rod 824 can rotate accordingly and meshingly drive the third bevel gear 826 connected to the bottom, so that the third bevel gear 826 drives the first stirring assembly 83 accordingly;

[0081] That is, the rotating shaft 831 installed inside the first stirring assembly 83 can rotate synchronously with the third bevel gear 826, and thereby, the rotation of the bottom-connected turntable 832 is realized. When the turntable 832 is in a rotating state, the first gears 835 installed on three sides of the upper end of the turntable 832 will perform self-rotation and revolution activities along the outside of the fixed-tooth disc 833. The second gears 836 connected to the lower ends of the first gears 835 can rotate simultaneously and revolve at the same time. When the second gears 836 are in a self-rotating state, the third gears 837 meshed with the sides of the second gears 836 and connected to the bottom of the turntable 832 can mesh and rotate, and thereby, the circumferential rotation of the bottom-connected rocker arm 838 is realized. In this way, the stirring rod 839 connected to one side of the lower end of the rocker arm 838 will perform large-range rotational stirring, and driven by the revolution, the three-side stirring rods 839 in large-range rotation can expand their stirring range, ensuring that the materials poured into the first mixing cylinder 3 and the second mixing cylinder 4 can be efficiently and quickly stirred and mixed, accelerating the stirring preparation of component A and component B. After the stirring and mixing activities of component A and component B are completed, they can quickly discharge along the first discharge pipe 6 and the second discharge pipe 7 installed correspondingly at the lower ends of the first mixing cylinder 3 and the second mixing cylinder 4, so as to accelerate the subsequent mixing efficiency of component A and component B, and greatly improve the overall preparation efficiency of the thermal conductive gel.

[0082] Please refer to Figures 8 - 10, the second stirring assembly 84 in this embodiment includes a docking plate 841. The docking plate 841 is placed on the upper end of the toothed disc 833, and the bottoms of three sides of the docking plate 841 are connected to the turntable 832. In this way, when the turntable 832 is in a rotating state, the rotation drive of the docking plate 841 can be synchronously realized. Active wheels 842 are installed inside the three sides of the docking plate 841, and the active wheels 842 are connected to the upper ends of the first gears 835. In this way, when the first gears 835 are in a self-rotating state, the rotation drive of the active wheels 842 connected to the top can be synchronously realized. A belt 843 is externally connected to the active wheels 842, and a driven wheel 844 is connected to the other side of the belt 843 away from the active wheels 842. A rotating rod 845 is vertically connected to the lower end of the driven wheel 844. A connecting rod 846 is fixedly connected to the bottom of the rotating rod 845 by a thread. A stirring blade 847 capable of rotating and stirring is installed at the bottom of the connecting rod 846. A transmission bevel gear 848 is rotatably installed on the left side of the upper end of the connecting rod 846. A convex shaft 849 is horizontally inserted into the upper left side of the transmission bevel gear 848, and the convex shaft 849 is inserted into the inside of the connecting ring 8410. And the inside of the connecting ring 8410 is arranged in a concave shape of a circular ring. The upper end of the transmission bevel gear 848 is meshed with a fixed bevel gear 8411. The upper end of the fixed bevel gear 8411 is vertically and fixedly connected to a second fixed cylinder 8414, and the top of the second fixed cylinder 8414 is connected to the bottom of the docking plate 841. In this way, the fixed bevel gear 8411 can be in a stable fixed installation state. The outside of the connecting ring 8410 is connected to a connecting cylinder 8412, and the upper end of the connecting cylinder 8412 is rotatably docked with the outside of the second fixed cylinder 8414. And the middle of the lower end of the connecting cylinder 8412 is in a limiting docking with the connecting rod 846. Three groups of connecting columns 8413 are horizontally inserted on both sides of the outer end of the connecting cylinder 8412.

[0083] Specifically, when the turntable 832 is in a rotating state along with the rotating shaft 831, the docking plate 841 installed at the upper end of the gear disk 833 and connected to the upper ends on three sides of the turntable 832 will rotate along the outside of the first fixed cylinder 834. When the first gear 835 rotates and revolves along the outside of the gear disk 833, the driving wheel 842 docked at the upper end of the gear disk 833 can be driven by the rotation of the first gear 835 to cooperate with the externally connected belt 843 to achieve the synchronous rotation of the driven wheel 844 installed on the other side. When the driven wheel 844 is in a rotating state, the rotating rod 845 docked at the lower end of the driven wheel 844 can rotate synchronously, and thereby, the rotating rod 846 fixed at the bottom can be rotated. Thus, the stirring blade 847 installed at the bottom of the connecting rod 846 will perform a rotating stirring activity. At the same time, the rotating connecting rod 846 will drive the rotation of the transmission bevel gear 848 installed on the left side of the upper end. The rotating transmission bevel gear 848 will be meshed and driven with the fixed bevel gear 8411 fixed at the upper end, enabling the transmission bevel gear 848 to drive the rotation of the convex shaft 849 installed on the left side of the upper end. Thus, the convex shaft 849 performing a rotating movement will cooperate with the circular concave portion formed inside the connecting ring 8410 to achieve the up-and-down reciprocating movement of the connecting ring 8410. As a result, the connecting cylinder 8412 docked to the outside of the connecting ring 8410 will move up and down synchronously, and the connecting columns 8413 provided on both sides of the outer end will move reciprocally synchronously to satisfy the up-and-down stirring of the material, further enhancing the material stirring effect and avoiding the problem of limited stirring angle;

[0084] Meanwhile, since the outer part of the lower end of the connecting rod 846 is limited and docked with the middle part of the lower end of the connecting cylinder 8412, when the connecting rod 846 is in a rotating state, it can synchronously drive the rotation of the connecting cylinder 8412. Thus, the connecting cylinder 8412 in an up-and-down reciprocating movement state can also perform a rotating activity. As a result, the connecting column 8413 installed on the outside of the connecting cylinder 8412 can perform diverse stirring activities to cooperate with the stirring rod 839 provided inside the first stirring assembly 83 to achieve multi-stage stirring and mixing;

[0085] Moreover, since the docking plate 841 rotates synchronously with the turntable 832, the connecting cylinders 8412 and the connecting columns 8413 on each side can also perform a revolution stirring and mixing activity, further strengthening and expanding the stirring range. Thus, multi-stage stirring and mixing can be efficiently achieved, enabling the A-component and B-component materials to be simultaneously stirred and mixed to improve the overall quality and efficiency of the thermal conductive gel and reduce the problem of wasted stirring time.

[0086] The above are only the preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-aging thermal conductive gel, characterized in that: The thermal conductive gel consists of component A and component B; by mass fraction, the raw material compositions of component A and component B are as follows: Component A: Polydimethylsiloxane: 50 - 70% Boron nitride thermal conductive powder: 20 - 35% Silicon carbide nanowires: 5 - 10% Organotin catalyst: 0.5 - 2% Silane coupling agent: 1 - 3%; Component B: Polydimethylsiloxane: 50 - 60% Boron nitride thermal conductive powder: 20 - 35% Silicon carbide nanowires: 5 - 10% Hydrogen-containing polymethylsiloxane: 1 - 7% Antioxidant: 1 - 3%.

2. The heat-conducting gel resistant to aging according to claim 1, characterized in that: The polydimethylsiloxane is an α,ω-dihydroxy-terminated linear structure with a viscosity range of 5000 - 10000 mPa·s (25°C) and a molecular weight of 200,000 - 500,000.

3. The anti-aging thermal conductive gel according to claim 1, wherein: The silane coupling agent can be composed of one or more of 3-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

4. The heat-conducting gel resistant to aging according to claim 1, characterized in that: The antioxidant can be composed of one or more of dibutyltin dilaurate, butylhydroxytoluene, phenyl-α-naphthylamine, p-phenylenediamine derivatives, and tris(2,4-di-tert-butylphenyl) phosphite.

5. A preparation method of an anti-aging thermal conductive gel, the anti-aging thermal conductive gel according to any one of claims 1-4, characterized in that: It includes the following steps: S1. Mixing of component A: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, and silane coupling agent into a high-speed mixer, stir and mix at a speed of 2000 - 3000 rpm for 20 - 30 minutes to fully disperse each component, then add the organotin catalyst and continue to stir for 10 - 15 minutes to obtain component A in the form of a semi-fluid paste; S2. Mixing of component B: Add polydimethylsiloxane, boron nitride thermal conductive powder, silicon carbide nanowires, silane coupling agent, and ultraviolet absorber into a high-speed mixer, mix at the same stirring speed and time, then add hydrogen-containing polymethylsiloxane and antioxidant and continue to stir for 10 - 15 minutes to obtain component B in the form of a semi-fluid paste; S3. Mixing and curing: Add the obtained component A mixture and component B mixture into a planetary mixer according to a mass ratio of 1:1, stir and mix at a speed of 100 - 500 rpm for 5 - 10 minutes, pour the mixed gel into a mold, place it in a vacuum oven, degas at a pressure of -0.095 to -0.1 MPa for 15 - 30 minutes to remove bubbles, and cure at 80 - 100°C for 1 - 2 hours. After cooling to room temperature, demold to obtain the aging-resistant thermal conductive gel.

6. The preparation method of an anti-aging thermal conductive gel according to claim 5, wherein: The high-speed mixer used in steps S1 and S2 includes a bracket (1), a control box (2) is provided on the left side of the top of the bracket (1), a first mixing cylinder (3) and a second mixing cylinder (4) are respectively installed on both sides of the upper end of the bracket (1), feed pipes (5) are installed at the rear sides of the upper ends of the first mixing cylinder (3) and the second mixing cylinder (4), first discharge pipes (6) and second discharge pipes (7) are respectively installed at the lower ends of the first mixing cylinder (3) and the second mixing cylinder (4), and a multi-stage stirring device (8) is provided on the top of the first mixing cylinder (3) and the second mixing cylinder (4).

7. The preparation method of an anti-aging thermal conductive gel according to claim 6, wherein: The multi-stage stirring device (8) includes a motor (81). The motor (81) is installed in the middle of a two-way transmission structure (82). The two-way transmission structure (82) is connected to the tops of a first mixing cylinder (3) and a second mixing cylinder (4). Both lower ends on the two sides of the two-way transmission structure (82) are connected to a first stirring assembly (83). A second stirring assembly (84) is arranged outside the first stirring assembly (83). The first stirring assembly (83) and the second stirring assembly (84) are both installed inside the first mixing cylinder (3) or the second mixing cylinder (4).

8. The preparation method of an anti-aging thermal conductive gel according to claim 7, wherein: The two-way transmission structure (82) includes a support frame (821). The support frame (821) is connected to the tops of the first mixing cylinder (3) and the second mixing cylinder (4). The lower end in the middle of the support frame (821) is connected to the motor (81). The top output end of the motor (81) is connected to a main bevel gear (822). First bevel gears (823) are meshed with both upper sides of the main bevel gear (822). One side in the middle of the first bevel gear (823) is connected to a connecting rod (824). The side of the connecting rod (824) far from the first bevel gear (823) is connected to a second bevel gear (825). A third bevel gear (826) is meshed with the lower end of the second bevel gear (825). The lower end in the middle of the third bevel gear (826) is connected to the first stirring assembly (83).

9. The preparation method of an anti-aging thermal conductive gel according to claim 8, wherein: The first stirring assembly (83) includes a rotating shaft (831). The upper end of the rotating shaft (831) is connected to the third bevel gear (826), and the lower end of the rotating shaft (831) is connected to a turntable (832). A toothed disc (833) is arranged on the top of the turntable (832). A first fixed cylinder (834) is fixedly arranged on the upper end of the toothed disc (833). The top of the first fixed cylinder (834) is connected to the upper end of the first mixing cylinder (3) or the second mixing cylinder (4). A first gear (835) is rotatably installed on the outer side of the upper end of the turntable (832). The first gear (835) is meshed with the outside of the toothed disc (833). The lower end of the first gear (835) is connected to a second gear (836). A third gear (837) is meshed with the outside of the second gear (836). The upper end of the third gear (837) is rotatably connected to the turntable (832). The lower end of the third gear (837) is connected to a rocker arm (838). A stirring rod (839) is installed on one side of the rocker arm (838).

10. The preparation method of an anti-aging thermal conductive gel according to claim 9, characterized in that: The second stirring assembly (84) includes a docking plate (841). The docking plate (841) is placed at the upper end of the toothed disc (833), and the bottom side of the docking plate (841) is connected to the turntable (832). An active wheel (842) is installed inside the side of the docking plate (841), and the active wheel (842) is connected to the upper end of the first gear (835). A belt (843) is connected to the outside of the active wheel (842) in a transmission manner. The other end of the belt (843) is connected to a driven wheel (844) in a transmission manner. A rotating rod (845) is docked at the lower end of the driven wheel (844). A connecting rod (846) is connected to the bottom of the rotating rod (845). Stirring blades (847) are installed at the bottom of the connecting rod (846), and a transmission bevel gear (848) is installed on the outer side of the upper end of the connecting rod (846). A convex shaft (849) is inserted into the outside of the transmission bevel gear (848), and the convex shaft (849) is inserted into the inside of the connecting ring (8410). A fixed bevel gear (8411) is engaged with the upper end of the transmission bevel gear (848). A second fixed cylinder (8414) is fixedly provided at the upper end of the fixed bevel gear (8411), and the top of the second fixed cylinder (8414) is connected to the bottom of the docking plate (841). The outside of the connecting ring (8410) is connected to a connecting cylinder (8412). A connecting column (8413) is inserted into the outside of the connecting cylinder (8412).

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