Novel heat-conducting glue preparation device and preparation method thereof

Abstract

The invention discloses a novel heat-conducting glue preparation device and a preparation method thereof, and relates to the technical field of heat-conducting glue preparation, and the technical scheme is that the novel heat-conducting glue preparation device comprises a mixing tank body, a housing is fixedly arranged at the top of the mixing tank body, a first heating plate is fixedly arranged on the inner wall of the mixing tank body, and a pretreatment mechanism is arranged at the top of the mixing tank body; the pretreatment mechanism comprises a third motor, the third motor is fixedly arranged at the top of the mixing tank body, the output end of the third motor is fixedly connected with a supporting frame, a plurality of pretreatment assemblies are arranged at the top of the supporting frame, and each pretreatment assembly comprises a first connecting shell and a second connecting shell; the preparation method has the beneficial effects that uniform dispersion of micron / nano filler is realized through a gradient mixing process, and 50Hz axial vibration is applied in a pre-curing stage through directional vibration assistance, so that directional arrangement of silicon carbide fibers, improvement of heat conduction anisotropy, synchronous defoaming and mixing, reduction of bubble residual rate, improvement of heat conductivity coefficient, long thermal cycle life and improvement of shear strength are promoted; the compactness and the thermal conductivity of the material are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal conductive adhesive preparation, and in particular to a novel thermal conductive adhesive preparation device and a preparation method thereof. Background Art

[0002] Thermally conductive adhesive is a single-component, heat-conductive, room-temperature curing silicone adhesive sealant. It undergoes a condensation reaction with moisture in the air to release low-molecular substances, causing cross-linking and curing, and then vulcanizes into a high-performance elastomer.

[0003] The existing thermal conductive fillers are unevenly dispersed, resulting in a discontinuous thermal conductive network, residual bubbles and internal stress concentration during the curing process, and other component ingredients are directly put into the internal mixer without heating and dehydration treatment and mixed with the base material, resulting in low mixing uniformity and efficiency. Summary of the Invention

[0004] To this end, the present invention provides a novel thermal conductive adhesive preparation device and preparation method to solve the problems of uneven dispersion of thermal conductive fillers leading to discontinuous thermal conductive network, residual bubbles and internal stress concentration during the curing process, and other component ingredients not being heated and dehydrated but directly put into the internal mixer for mixing with the base material, resulting in low mixing uniformity and efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a novel thermally conductive adhesive, comprising 100-140 parts of methyl vinyl silicone rubber (vinyl content 0.8%), 5-8 parts of hydrogenated silicone oil, 120-150 parts of aluminum oxide, 30-50 parts of nano-boron nitride (100 nm), 0.5-1 part of a platinum catalyst, 1.5 parts of a silane coupling agent (KH-560), 10-20 parts of silicon carbide (fibrous), and 0.3-0.5 parts of a low molecular weight siloxane inhibitor; The specific steps are as follows: S1. Matrix pretreatment: Soften the raw methyl vinyl silicone rubber at 70°C and cut into blocks. Crush the blocky zinc oxide compounding agent to a particle size of ≤50μm and heat it. Heat the liquid compounding agent (hydrogenated silicone oil, silane coupling agent) to 60°C to remove moisture and filter out impurities. S2, gradient mixing and dispersion: A. Internal Mixing: Set the internal mixer temperature to 120°C and the rotor speed to 30 r / min. Add the methyl vinyl silicone rubber base material and plasticize for 10 minutes to break the macromolecular chain to increase plasticity. Then add zinc oxide, SA stearate, and carbon black in sequence and mix for 5 minutes. Then add micron alumina, nano boron nitride, and silicon carbide fiber in batches and mix until uniform (15-20 minutes). B. Open refining: Adjust the roller spacing of the two-roll mill to 1mm, continuously wrap the rubber material around the rollers, add sulfur (1.2 parts) and accelerator DTDM (0.5 parts), roll the material into triangle bags and refining for 3 times, and vacuum degassing treatment (-0.095MPa, 30min) S3, Directional Solidification Molding: A. Pre-curing stage: The rubber compound is injected into the mold and pre-cured at 80°C and 0.2MPa pressure for 40 minutes. Axial vibration (frequency 50Hz, amplitude 0.1mm) is simultaneously applied to promote the directional arrangement of the filler. B. Step heating stage: replicate 80℃ → 100℃ (1℃ / min) → constant temperature for 30min → 100℃ → 120℃ (0.5℃ / min) → constant temperature for 1h. The pressure is gradually reduced from 0.2MPa to normal pressure to avoid packing displacement; C. Post-curing stage: 150℃ hot air circulation post-curing for 20 minutes; naturally cool to room temperature (cooling rate ≤ 1℃ / min) to reduce thermal stress; S4. The vulcanized thermal conductive adhesive is left to stand for 24 hours and then cut into the specified size using a laser cutting machine.

[0006] A novel thermal conductive adhesive preparation device comprises a mixing tank body, a cover shell is fixedly provided on the top of the mixing tank body, a first heating plate is fixedly provided on the inner wall of the mixing tank body, and a pretreatment mechanism is provided on the top of the mixing tank body; The pretreatment mechanism includes a third motor, which is fixedly arranged on the top of the mixing tank body, and the output end of the third motor is fixedly connected to a support frame, and a plurality of pretreatment components are provided on the top of the support frame. The pretreatment components include a first connecting shell and a second connecting shell, and the first connecting shell and the second connecting shell are fixedly arranged on the top of the support frame. A first sliding block is provided inside the first connecting shell, and a second sliding block is provided inside the second connecting shell. One side of the first sliding block is connected to a first connecting rod through a bearing, and one side of the second sliding block is fixedly provided with a second connecting rod, and a pretreatment cylinder is fixed between the first connecting rod and the second connecting rod, and a second heating plate is embedded in the inner wall of the pretreatment cylinder, and a circular plate is provided at the bottom of the pretreatment cylinder.

[0007] Preferably, a transmission assembly is provided on the top of the support frame, and the transmission assembly includes a fourth motor. The fourth motor is fixedly provided on the top of the support frame, and the output end of the fourth motor is fixedly connected to a large gear. One side of the first connecting shell is connected to a threaded rod through a bearing, and the threaded rod passes through the first sliding block and is connected to the first sliding block through a thread, and one end of the threaded rod is fixedly connected to the first gear, and the first gear is meshed with the large gear.

[0008] Preferably, a control component is provided on one side of the support frame, and the control component includes a second electric push rod, the second electric push rod is fixedly provided at the bottom of the support frame, the output end of the second electric push rod is fixedly connected to a support ring, and two limit rods are fixedly provided at the bottom of the support ring, and the limit rod passes through the support frame and is slidably connected to the support frame, and a plurality of connecting plates are fixedly provided on the outside of the support ring, and a tooth plate is fixedly provided on one side of the connecting plate, and two sliders are fixedly provided on one side of the tooth plate, and side grooves are provided on both sides of the second connecting shell, and the slider is slidably connected to the side grooves, and a second gear is provided on one side of the tooth plate, and the tooth plate is meshed with the second gear, and one side of the second gear is fixedly connected to a third connecting rod, and one end of the third connecting rod is fixedly connected to a base, and the base rotates inside the second connecting shell, and the base is engaged with the second sliding block.

[0009] Preferably, a pushing assembly is provided on the top of the cover shell, and the pushing assembly includes a plurality of fixed rods, and the plurality of fixed rods are fixedly provided on the top of the cover shell, and a top plate is fixedly provided on the top of the plurality of fixed rods, and a first electric push rod is fixedly provided on the top of the top plate, and the output end of the first electric push rod is fixedly connected to a support plate, and a plurality of push rods are fixedly provided on the bottom of the support plate, and the push rods pass through the top of the cover shell and are slidably connected to the cover shell.

[0010] Preferably, a plurality of feed ports are provided on the top of the mixing tank body, and a plurality of closing components are provided on the outer surface of the mixing tank body, and the closing component includes a side frame, and the side frame is fixedly provided on one side of the mixing tank body and the cover shell, and a first motor is fixedly provided on one side of the side frame, and a screw rod is fixedly connected to the output end of the first motor, and one end of the screw rod is connected to the side wall of the mixing tank body through a bearing, and a threaded plate is provided on the outside of the screw rod through a threaded sleeve, and a sealing plate is fixedly provided on one side of the threaded plate, and one side of the sealing plate extends into the interior of the feed port.

[0011] Preferably, a second motor is fixedly provided at the bottom of the mixing tank body, and a transmission shaft is fixedly connected to the output end of the second motor. The transmission shaft extends into the interior of the mixing tank body, and one end of the transmission shaft is connected to the top of the mixing tank body through a bearing. A plurality of stirring rods are fixedly connected to the outside of the transmission shaft, and a scraper plate is fixedly provided on one side of the transmission shaft.

[0012] Preferably, a feeding pipe is fixedly provided on the top of the cover shell.

[0013] Preferably, a feed pipe is fixedly provided on one side of the cover shell, one end of the feed pipe is fixedly connected to the top of the mixing tank body, and a discharge pipe is fixedly provided on the bottom of the mixing tank body.

[0014] Preferably, a plurality of supporting legs are fixedly provided on the bottom of the mixing tank body.

[0015] The embodiments of the present invention have the following advantages: 1. Uniform dispersion of micron / nano fillers is achieved through a gradient mixing process. With the assistance of directional vibration, 50Hz axial vibration is applied during the pre-curing stage to align the silicon carbide fibers, improve thermal conductivity anisotropy, and achieve simultaneous degassing and mixing, thereby reducing the residual bubble rate, improving thermal conductivity, extending thermal cycle life, increasing shear strength, and improving material density and thermal conductivity. 2. By setting up a pre-treatment mechanism, the ingredients of other components can be heated and dehydrated in advance and heated to a liquid state, effectively solving the problem of low mixing efficiency caused by directly adding ingredients into the internal mixer to mix with the base material. At the same time, the flip design of the pre-treatment cylinder and the pushing action of the push rod mechanism ensure that the ingredients can enter the mixing tank accurately and efficiently, further improving the mixing efficiency. 3. Through the coordinated work of multiple components such as the transmission component, control component and electric push rod, precise control of the pretreatment barrel is achieved. Whether it is the rotation, lifting and lowering of the pretreatment barrel, or the pushing and scraping of ingredients, it can be completed through automatic operation, which greatly reduces the burden of manual operation and improves the automation level of the preparation process. The stirring rod and scraper installed inside the mixing tank can fully stir and scrape the raw materials under the drive of the second motor to ensure that the raw materials are mixed evenly. In particular, the design of the scraper can effectively avoid residual ingredients at the bottom of the pretreatment barrel and further improve the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0018] Figure 1 A schematic diagram of the overall structure provided by the present invention; Figure 2 A cross-sectional view of the overall structure provided by the present invention; Figure 3 A three-dimensional diagram of the transmission assembly provided by the present invention; Figure 4 A three-dimensional diagram of the pretreatment mechanism provided by the present invention; Figure 5 A three-dimensional diagram of the pre-treatment component provided by the present invention; Figure 6 A cross-sectional view of a pre-treatment assembly provided by the present invention; Figure 7 This is a three-dimensional diagram of the card holder provided by the present invention.

[0019] In the figure: 1, mixing tank; 2, cover; 3, side frame; 4, first motor; 5, blocking plate; 6, threaded plate; 7, screw; 8, second motor; 9, feed pipe; 10, support leg; 11, feed pipe; 12, fixed rod; 13, top plate; 14, first electric push rod; 15, support plate; 16, feed pipe; 17, push rod; 18, pretreatment cylinder; 19, transmission shaft; 20, stirring rod; 21, scraper plate; 22, first heating plate; 23, third motor; 24, support frame; 25, first Four motors; 26. Support ring; 27. Large gear; 28. Feed port; 29. Connecting plate; 30. Second electric push rod; 31. Limit rod; 32. First connecting shell; 33. Second connecting shell; 34. Threaded rod; 35. First gear; 36. Side groove; 37. Tooth plate; 38. Second gear; 39. Slider; 40. First connecting rod; 41. First sliding block; 42. Second connecting rod; 43. Second heating plate; 44. Third connecting rod; 45. Card seat; 46. Second sliding block; 47. Round plate. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0021] Example 1: Refer to the attached Figure 1 -Attached Figure 7 The present invention provides a method for preparing a novel thermally conductive adhesive. The raw materials include the following components, calculated by weight: 100-140 parts of methyl vinyl silicone rubber (vinyl content 0.8%), 5-8 parts of hydrogenated silicone oil, 120-150 parts of aluminum oxide, 30-50 parts of nano-boron nitride (100 nm), 0.5-1 part of platinum catalyst, 1.5 parts of silane coupling agent (KH-560), 10-20 parts of silicon carbide (fibrous), and 0.3-0.5 parts of a low-molecular-weight siloxane inhibitor. The specific steps are as follows: S1. Matrix pretreatment: Soften the raw methyl vinyl silicone rubber at 70°C and cut into blocks. Crush the blocky zinc oxide compounding agent to a particle size of ≤50μm and heat it. Heat the liquid compounding agent (hydrogenated silicone oil, silane coupling agent) to 60°C to remove moisture and filter out impurities. S2, gradient mixing and dispersion: A. Internal Mixing: Set the internal mixer temperature to 120°C and the rotor speed to 30 r / min. Add the methyl vinyl silicone rubber base material and plasticize for 10 minutes to break the macromolecular chain to increase plasticity. Then add zinc oxide, SA stearate, and carbon black in sequence and mix for 5 minutes. Then add micron alumina, nano boron nitride, and silicon carbide fiber in batches and mix until uniform (15-20 minutes). B. Open refining: Adjust the roller spacing of the two-roll mill to 1mm, continuously wrap the rubber material around the rollers, add sulfur (1.2 parts) and accelerator DTDM (0.5 parts), roll the material into triangle bags and refining for 3 times, and vacuum degassing treatment (-0.095MPa, 30min) S3, Directional Solidification Molding: A. Pre-curing stage: The rubber compound is injected into the mold and pre-cured at 80°C and 0.2MPa pressure for 40 minutes. Axial vibration (frequency 50Hz, amplitude 0.1mm) is simultaneously applied to promote the directional arrangement of the filler. B. Step heating stage: 80℃ → 100℃ (1℃ / min) → constant temperature for 30min → 100℃ → 120℃ (0.5℃ / min) → constant temperature for 1h. The pressure is gradually reduced from 0.2MPa to normal pressure to avoid packing displacement; C. Post-curing stage: 150℃ hot air circulation post-curing for 20 minutes; naturally cool to room temperature (cooling rate ≤ 1℃ / min) to reduce thermal stress; S4. The vulcanized thermal conductive adhesive is left to stand for 24 hours and then cut into the specified size using a laser cutting machine.

[0022] A novel thermal conductive adhesive preparation device includes a mixing tank body 1, a cover shell 2 is fixedly provided on the top of the mixing tank body 1, a first heating plate 22 is fixedly provided on the inner wall of the mixing tank body 1, and a pretreatment mechanism is provided on the top of the mixing tank body 1; The pretreatment mechanism includes a third motor 23, which is fixed to the top of the mixing tank body 1, and the output end of the third motor 23 is fixedly connected to the support frame 24, and a plurality of pretreatment components are provided on the top of the support frame 24, and the pretreatment components include a first connecting shell 32 and a second connecting shell 33, which are fixed to the top of the support frame 24, a first sliding block 41 is provided inside the first connecting shell 32, and a second sliding block 46 is provided inside the second connecting shell 33, one side of the first sliding block 41 is connected to the first connecting rod 40 through a bearing, and one side of the second sliding block 46 is fixedly provided with a second connecting rod 42, a pretreatment cylinder 18 is fixed between the first connecting rod 40 and the second connecting rod 42, the inner wall of the pretreatment cylinder 18 is embedded with a second heating plate 43, and the bottom of the pretreatment cylinder 18 is provided with a circular plate 47; In this embodiment, ingredients of other components are added to the pretreatment barrel 18, and then the ingredients inside the pretreatment barrel 18 are heated by the second heating plate 43 to remove moisture and heat the ingredients into a liquid state. The third motor 23 is started, and the third motor 23 controls the rotation of the support frame 24, which controls the pretreatment barrel 18 of the pretreatment assembly to rotate above the feed port 28; Among them, in order to achieve the purpose of transmission, this device is implemented by the following technical scheme: a transmission assembly is provided on the top of the support frame 24, and the transmission assembly includes a fourth motor 25, the fourth motor 25 is fixedly arranged on the top of the support frame 24, the output end of the fourth motor 25 is fixedly connected to the large gear 27, and one side of the first connecting shell 32 is connected to a threaded rod 34 through a bearing, the threaded rod 34 passes through the first sliding block 41 and is threadedly connected to the first sliding block 41, one end of the threaded rod 34 is fixedly connected to the first gear 35, the first gear 35 is meshed with the large gear 27, and the fourth motor 25 is started. The fourth motor 25 controls the large gear 27 to rotate, and the large gear 27 drives the first gear 35 to rotate. The first gear 35 drives the threaded rod 34 to rotate, and the threaded rod 34 drives the first sliding block 41 to move downward. The first sliding block 41 drives the first connecting rod 40 to move downward, and the first connecting rod 40 drives the pretreatment cylinder 18 to move downward, and the pretreatment cylinder 18 passes through the feed inlet 28 and extends into the interior of the mixing tank body 1; Among them, in order to achieve the purpose of control, this device is implemented by the following technical solutions: a control component is provided on one side of the support frame 24, and the control component includes a second electric push rod 30, which is fixed to the bottom of the support frame 24, and the output end of the second electric push rod 30 is fixedly connected to a support ring 26, and two limit rods 31 are fixedly provided at the bottom of the support ring 26, and the limit rods 31 pass through the support frame 24 and are slidably connected to the support frame 24, and a plurality of connecting plates 29 are fixedly provided on the outside of the support ring 26, and a tooth plate 37 is fixed on one side of the connecting plate 29, and two sliders 39 are fixed on one side of the tooth plate 37, and side grooves 36 are provided on both sides of the second connecting shell 33, and the sliders 39 are slidably connected to the side grooves 36, and a second gear 38 is provided on one side of the tooth plate 37, and the tooth plate 37 and the second gear 38 are connected The second gear 38 is meshed with each other, and one side of the second gear 38 is fixedly connected to the third connecting rod 44, and one end of the third connecting rod 44 is fixedly connected to the clamping seat 45. The clamping seat 45 rotates inside the second connecting shell 33, and the clamping seat 45 is engaged with the second sliding block 46. The second electric push rod 30 is started, and the second electric push rod 30 controls the support ring 26 to move upward. The support ring 26 drives the connecting plate 29 to move upward, and the connecting plate 29 drives the tooth plate 37 to move upward. The tooth plate 37 moves upward and drives the second gear 38 to rotate. The second gear 38 drives the third connecting rod 44 to rotate, and the third connecting rod 44 drives the clamping seat 45 to rotate. The clamping seat 45 drives the second sliding block 46 to rotate. The second sliding block 46 drives the second connecting rod 42 to rotate. The second connecting rod 42 drives the pretreatment barrel 18 to rotate, and the pretreatment barrel 18 flips, so that the ingredients in the pretreatment barrel 18 fall into the mixing tank body 1 through the feed port 28; Among them, in order to achieve the purpose of pushing, the present device adopts the following technical solutions: a pushing assembly is provided on the top of the cover shell 2, and the pushing assembly includes a plurality of fixed rods 12, and the plurality of fixed rods 12 are fixedly provided with a top plate 13 on the top of the plurality of fixed rods 12, and a first electric push rod 14 is fixedly provided on the top of the top plate 13, and the output end of the first electric push rod 14 is fixedly connected to a support plate 15, and a plurality of push rods 17 are fixedly provided at the bottom of the support plate 15, and the push rod 17 passes through the top of the cover shell 2 and is slidably connected to the cover shell 2. When the first electric push rod 14 is started, the first electric push rod 14 controls the support plate 15 to move downward, and the support plate 15 drives the push rod 17 to move downward, and the push rod 17 moves downward and contacts the circular plate 47, thereby pushing the circular plate 47 to move, and the circular plate 47 pushes the remaining ingredients out of the pretreatment cylinder 18 until the surface of the circular plate 47 moves out of the opening of the pretreatment cylinder 18; Among them, in order to achieve the purpose of sealing, the present device is implemented by the following technical scheme: a plurality of feed ports 28 are opened on the top of the mixing tank body 1, a plurality of sealing components are provided on the outer surface of the mixing tank body 1, and the sealing component includes a side frame 3, the side frame 3 is fixedly arranged on one side of the mixing tank body 1 and the cover shell 2, a first motor 4 is fixedly provided on one side of the side frame 3, a screw rod 7 is fixedly connected to the output end of the first motor 4, one end of the screw rod 7 is connected to the side wall of the mixing tank body 1 through a bearing, a threaded plate 6 is provided on the outside of the screw rod 7 through a threaded sleeve, a blocking plate 5 is fixedly provided on one side of the threaded plate 6, and one side of the blocking plate 5 extends into the inside of the feed port 28, the first motor 4 is started, the first motor 4 controls the screw rod 7 to rotate, the screw rod 7 controls the threaded plate 6 to move, the threaded plate 6 drives the blocking plate 5 to move, and the blocking plate 5 enters the feed port 28 and blocks the feed port 28; Among them, in order to achieve the purpose of mixing, the present device adopts the following technical solution: a second motor 8 is fixedly provided at the bottom of the mixing tank body 1, and a transmission shaft 19 is fixedly connected to the output end of the second motor 8. The transmission shaft 19 extends into the interior of the mixing tank body 1, and one end of the transmission shaft 19 is connected to the top of the mixing tank body 1 through a bearing. A plurality of stirring rods 20 are fixedly connected to the outside of the transmission shaft 19, and a scraper plate 21 is fixedly provided on one side of the transmission shaft 19. When the second motor 8 is started, the second motor 8 controls the rotation of the transmission shaft 19, and the transmission shaft 19 drives the stirring rod 20 to rotate. The stirring rod 20 stirs the material inside the mixing tank body 1, and the transmission shaft 19 rotates and drives the scraper plate 21 to rotate. The scraper plate 21 rotates and contacts the surface of the circular plate 47 and scrapes off the remaining ingredients on the surface. The ingredients fall into the interior of the mixing tank body 1 and are stirred by the rotation of the stirring rod 20, so that the mixing efficiency is accelerated. Among them, in order to achieve the purpose of feeding, this device adopts the following technical solution: a feeding pipe 16 is fixedly provided on the top of the cover shell 2, a feeding pipe 11 is fixedly provided on one side of the cover shell 2, one end of the feeding pipe 11 is fixedly connected to the top of the mixing tank body 1, and a discharge pipe 9 is fixedly provided at the bottom of the mixing tank body 1. The ingredients are fed through the feeding pipe 16, the base material is fed through the feeding pipe 11, and the mixed raw materials are discharged through the discharge pipe 9; In order to achieve the purpose of support, the present device is implemented by adopting the following technical solution: a plurality of support legs 10 are fixedly provided at the bottom of the mixing tank body 1 , and the support legs 10 have the function of supporting the mixing tank body 1 .

[0023] The use process of the present invention is as follows: when using the present invention, a base material is added to the inside of the mixing tank body 1 through the feeding pipe 11 and heated by the first heating plate 22, the second motor 8 is started, the second motor 8 controls the transmission shaft 19 to rotate, the transmission shaft 19 drives the stirring rod 20 to rotate, the stirring rod 20 stirs the material inside the mixing tank body 1, and the ingredients of other components are added to the pretreatment barrel 18 through the feeding pipe 16, and then the ingredients inside the pretreatment barrel 18 are heated by the second heating plate 43, thereby removing moisture and heating the ingredients into a liquid state, and then the third motor 23 is started, the third motor 23 controls the support frame 24 to rotate, the support frame 24 controls the pretreatment barrel 18 of the pretreatment assembly to rotate above the feeding port 28, and then the second motor is started. The push rod 30 is driven, and the second electric push rod 30 controls the support ring 26 to move upward, and the support ring 26 drives the connecting plate 29 to move upward, and the connecting plate 29 drives the tooth plate 37 to move upward, and the tooth plate 37 moves upward and drives the second gear 38 to rotate, and the second gear 38 drives the third connecting rod 44 to rotate, and the third connecting rod 44 drives the card seat 45 to rotate, and the card seat 45 drives the second sliding block 46 to rotate, and the second sliding block 46 drives the second connecting rod 42 to rotate, and the second connecting rod 42 drives the pretreatment barrel 18 to rotate, and the pretreatment barrel 18 flips, so that the ingredients in the pretreatment barrel 18 fall into the interior of the mixing tank body 1 through the feed port 28, and then the fourth motor 25 is started, and the fourth motor 25 controls the large gear 27 to rotate, and the large gear 27 drives the first gear 35 to rotate, and the first gear 35 drives the screw The threaded rod 34 rotates, the threaded rod 34 drives the first sliding block 41 to move downward, the first sliding block 41 drives the first connecting rod 40 to move downward, the first connecting rod 40 drives the pretreatment barrel 18 to move downward, the pretreatment barrel 18 passes through the feed port 28 and extends into the interior of the mixing tank body 1, the first electric push rod 14 is started, the first electric push rod 14 controls the support plate 15 to move downward, the support plate 15 drives the push rod 17 to move downward, the push rod 17 moves downward and contacts the circular plate 47, thereby pushing the circular plate 47 to move, the circular plate 47 pushes the remaining ingredients out of the pretreatment barrel 18 until the surface of the circular plate 47 moves out of the opening of the pretreatment barrel 18, and rotates through the transmission shaft 19 and drives the scraper plate 21 to rotate, the scraper plate 21 rotates and contacts the surface of the circular plate 47 and scrapes off the remaining ingredients on the surface, and the ingredients fall into the mixing tank. Inside the body 1, the stirring rod 20 rotates and stirs, and the mixing efficiency is accelerated. Then, the transmission component is used to re-control the pretreatment barrel 18 to move out of the mixing tank body 1. The control component is used to re-control the opening of the pretreatment barrel 18 to face upward, and the first electric push rod 14 is started. The first electric push rod 14 controls the support plate 15 to move downward, and the support plate 15 drives the push rod 17 to move downward. The push rod 17 moves downward and contacts the circular plate 47, thereby pushing the circular plate 47 back to the bottom of the pretreatment barrel 18. The first motor 4 is started, and the first motor 4 controls the screw rod 7 to rotate. The screw rod 7 controls the threaded plate 6 to move. The threaded plate 6 drives the sealing plate 5 to move. The sealing plate 5 enters the feed port 28 and blocks the feed port 28. After the raw materials inside the mixing tank body 1 are fully mixed, they can be discharged through the discharge pipe 9.

[0024] Example 2: The present invention provides a method for preparing a novel thermally conductive adhesive. The raw materials include the following components, measured by weight: 100-140 parts of methyl vinyl silicone rubber (vinyl content 0.8%), 5-8 parts of hydrogenated silicone oil, 120-150 parts of aluminum oxide, 30-50 parts of nano-boron nitride (100 nm), 0.5-1 part of a platinum catalyst, 1.5 parts of a silane coupling agent (KH-560), 10-20 parts of silicon carbide (fibrous), and 0.3-0.5 parts of a low-molecular-weight siloxane inhibitor. The specific steps are as follows: S1. Matrix pretreatment: Soften the raw methyl vinyl silicone rubber at 70°C and cut into blocks. Crush the blocky zinc oxide compounding agent to a particle size of ≤50μm and heat it. Heat the liquid compounding agent (hydrogenated silicone oil, silane coupling agent) to 60°C to remove moisture and filter out impurities. S2, gradient mixing and dispersion: A. Internal Mixing: Set the internal mixer temperature to 120°C and the rotor speed to 30 r / min. Add the methyl vinyl silicone rubber base material and plasticize for 10 minutes to break the macromolecular chain to increase plasticity. Then add zinc oxide, SA stearate, and carbon black in sequence and mix for 5 minutes. Then add micron alumina, nano boron nitride, and silicon carbide fiber in batches and mix until uniform (15-20 minutes). B. Open refining: Adjust the roller spacing of the two-roll mill to 1mm, continuously wrap the rubber material around the rollers, add sulfur (1.2 parts) and accelerator DTDM (0.5 parts), roll the material into triangle bags and refining for 3 times, and vacuum degassing treatment (-0.095MPa, 30min) S3, Directional Solidification Molding: A. Pre-curing stage: The rubber compound is injected into the mold and pre-cured at 80°C and 0.2MPa pressure for 40 minutes. Axial vibration (frequency 50Hz, amplitude 0.1mm) is simultaneously applied to promote the directional arrangement of the filler. B. Step heating stage: 70℃ → 110℃ (1℃ / min) → constant temperature for 30min → 110℃ → 120℃ (1℃ / min) → constant temperature for 1h. The pressure is gradually reduced from 0.2MPa to normal pressure to avoid packing displacement; C. Post-curing stage: 150℃ hot air circulation post-curing for 20 minutes; naturally cool to room temperature (cooling rate ≤ 1℃ / min) to reduce thermal stress; S4. The vulcanized thermal conductive adhesive is left to stand for 24 hours and then cut into the specified size using a laser cutting machine.

[0025] Three groups of thermal conductive adhesives were prepared according to the novel thermal conductive adhesive preparation method of Examples 1 and 2, and the traditional thermal conductive adhesive preparation method. Comparative tests of thermal conductivity, bubble rate, shear strength, thermal cycle life, and volume resistivity were performed to test performance. From the data in the above table, it can be seen that the thermal conductive adhesive prepared in Example 1 has improved thermal conductivity, long thermal cycle life, improved shear strength, and improved material density and thermal conductivity.

[0026] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the present invention falls within the scope of protection claimed by the present invention.

Claims

1. A new method for preparing thermally conductive adhesive, wherein the raw materials are Includes the following ingredients: Methyl vinyl silicone rubber (vinyl content 0.8%) 100-140 parts, hydrogenated silicone oil 5-8 parts, aluminum oxide 120-150 parts, nano-boron nitride (100nm) 30-50 parts, platinum catalyst 0.5-1 part, silane coupling agent (KH-560) 1.5 parts, silicon carbide (fibrous) 10-20 parts, low molecular weight siloxane inhibitor 0.3-0.5 parts; The specific steps are as follows: S1. Matrix pretreatment: Soften the raw methyl vinyl silicone rubber at 70°C and cut into blocks. Crush the blocky zinc oxide compounding agent to a particle size of ≤50μm and heat it. Heat the liquid compounding agent (hydrogenated silicone oil, silane coupling agent) to 60°C to remove moisture and filter out impurities. S2, gradient mixing and dispersion: A. Internal Mixing: Set the internal mixer temperature to 120°C and the rotor speed to 30 r / min. Add the methyl vinyl silicone rubber base material and plasticize for 10 minutes to break the macromolecular chain to increase plasticity. Then add zinc oxide, SA stearate, and carbon black in sequence and mix for 5 minutes. Then add micron alumina, nano boron nitride, and silicon carbide fiber in batches and mix until uniform (15-20 minutes). B. Open refining: Adjust the roller spacing of the two-roll mill to 1mm, continuously wrap the rubber material around the rollers, add sulfur (1.2 parts) and accelerator DTDM (0.5 parts), roll the material into triangle bags and refining for 3 times, and vacuum degassing treatment (-0.095MPa, 30min) S3, Directional Solidification Molding: A. Pre-curing stage: The rubber compound is injected into the mold and pre-cured at 80°C and 0.2MPa pressure for 40 minutes. Axial vibration (frequency 50Hz, amplitude 0.1mm) is simultaneously applied to promote the directional arrangement of the filler. B. Step heating stage: replicate 80℃ → 100℃ (1℃ / min) → constant temperature for 30min → 100℃ → 120℃ (0.5℃ / min) → constant temperature for 1h. The pressure is gradually reduced from 0.2MPa to normal pressure to avoid packing displacement; C. Post-curing stage: 150℃ hot air circulation post-curing for 20 minutes; naturally cool to room temperature (cooling rate ≤ 1℃ / min) to reduce thermal stress; S4. The vulcanized thermal conductive adhesive is left to stand for 24 hours and then cut into the specified size using a laser cutting machine.

2. A novel thermal conductive adhesive preparation device, suitable for a novel thermal conductive adhesive preparation method as claimed in claim 1, comprising a mixing tank (1), characterized in that: A cover shell (2) is fixedly provided on the top of the mixing tank body (1), a first heating plate (22) is fixedly provided on the inner wall of the mixing tank body (1), and a pretreatment mechanism is provided on the top of the mixing tank body (1); The pretreatment mechanism includes a third motor (23), the third motor (23) is fixedly arranged on the top of the mixing tank body (1), the output end of the third motor (23) is fixedly connected to the support frame (24), and a plurality of pretreatment components are provided on the top of the support frame (24), the pretreatment components include a first connecting shell (32) and a second connecting shell (33), the first connecting shell (32) and the second connecting shell (33) are fixedly arranged on the top of the support frame (24), a first sliding block (41) is provided inside the first connecting shell (32), and a second sliding block (46) is provided inside the second connecting shell (33), one side of the first sliding block (41) is connected to a first connecting rod (40) through a bearing, and one side of the second sliding block (46) is fixedly provided with a second connecting rod (42), a pretreatment cylinder (18) is fixed between the first connecting rod (40) and the second connecting rod (42), the inner wall of the pretreatment cylinder (18) is embedded with a second heating plate (43), and the bottom of the pretreatment cylinder (18) is provided with a circular plate (47).

3. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A transmission assembly is provided on the top of the support frame (24), and the transmission assembly includes a fourth motor (25). The fourth motor (25) is fixedly provided on the top of the support frame (24). The output end of the fourth motor (25) is fixedly connected to a large gear (27). One side of the first connecting shell (32) is connected to a threaded rod (34) through a bearing. The threaded rod (34) passes through the first sliding block (41) and is connected to the first sliding block (41) through a thread. One end of the threaded rod (34) is fixedly connected to a first gear (35), and the first gear (35) is meshed with the large gear (27).

4. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A control assembly is provided on one side of the support frame (24), and the control assembly includes a second electric push rod (30), the second electric push rod (30) is fixedly provided at the bottom of the support frame (24), and the output end of the second electric push rod (30) is fixedly connected to a support ring (26), and two limit rods (31) are fixedly provided at the bottom of the support ring (26), and the limit rods (31) pass through the support frame (24) and are slidably connected to the support frame (24), and a plurality of connecting plates (29) are fixedly provided on the outside of the support ring (26), and a tooth plate (37) is fixedly provided on one side of the connecting plate (29), and the tooth plate Two sliders (39) are fixedly provided on one side of the second connecting shell (33), side grooves (36) are provided on both sides of the second connecting shell (33), the sliders (39) are slidably connected to the side grooves (36), a second gear (38) is provided on one side of the tooth plate (37), the tooth plate (37) is meshed with the second gear (38), a third connecting rod (44) is fixedly connected to one side of the second gear (38), one end of the third connecting rod (44) is fixedly connected to a clamping seat (45), the clamping seat (45) rotates inside the second connecting shell (33), and the clamping seat (45) is engaged with the second sliding block (46).

5. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A push assembly is provided on the top of the cover shell (2), and the push assembly includes a plurality of fixed rods (12), the plurality of fixed rods (12) are fixedly provided on the top of the cover shell (2), a top plate (13) is fixedly provided on the top of the plurality of fixed rods (12), a first electric push rod (14) is fixedly provided on the top of the top plate (13), an output end of the first electric push rod (14) is fixedly connected to a support plate (15), a plurality of push rods (17) are fixedly provided on the bottom of the support plate (15), and the push rods (17) pass through the top of the cover shell (2) and are slidably connected to the cover shell (2).

6. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: The top of the mixing tank body (1) is provided with a plurality of feed ports (28), and the outer surface of the mixing tank body (1) is provided with a plurality of closing components, the closing components including a side frame (3), the side frame (3) being fixedly provided on one side of the mixing tank body (1) and the cover shell (2), a first motor (4) being fixedly provided on one side of the side frame (3), a screw rod (7) being fixedly connected to the output end of the first motor (4), one end of the screw rod (7) being connected to the side wall of the mixing tank body (1) via a bearing, a threaded plate (6) being provided on the outside of the screw rod (7) via a threaded sleeve, a blocking plate (5) being fixedly provided on one side of the threaded plate (6), and one side of the blocking plate (5) extending into the interior of the feed port (28).

7. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A second motor (8) is fixedly provided at the bottom of the mixing tank body (1), and a transmission shaft (19) is fixedly connected to the output end of the second motor (8). The transmission shaft (19) extends into the interior of the mixing tank body (1), and one end of the transmission shaft (19) is connected to the top of the mixing tank body (1) via a bearing. A plurality of stirring rods (20) are fixedly connected to the outside of the transmission shaft (19), and a scraper plate (21) is fixedly provided on one side of the transmission shaft (19).

8. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A feeding pipe (16) is fixedly provided on the top of the cover shell (2).

9. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A feed pipe (11) is fixedly provided on one side of the cover shell (2), one end of the feed pipe (11) is fixedly connected to the top of the mixing tank body (1), and a discharge pipe (9) is fixedly provided on the bottom of the mixing tank body (1).

10. The novel thermal conductive adhesive preparation device according to claim 2, characterized in that: A plurality of supporting legs (10) are fixedly provided on the bottom of the mixing tank body (1).

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