Semi-cured aerogel heat insulation mud and preparation method thereof

Abstract

The invention belongs to the technical field of heat management materials, and particularly discloses semi-solidified aerogel heat insulation mud and a preparation method thereof.The heat conductivity coefficient of the semi-solidified aerogel heat insulation mud is lower than that of a traditional heat insulation material through the extremely low heat conduction characteristic of silicon dioxide aerogel powder and the synergistic effect of filler such as calcium carbonate and hollow glass beads; heat transfer can be effectively blocked, and the heat insulation effect is remarkable. In addition, the material has a unique semi-cured muddy form, so that the material has high plasticity similar to plasticine, irregular gaps in electronic products can be accurately filled, fixed-point heat insulation is achieved, meanwhile, the material has the functions of insulation, flame retardance and shock absorption, the process is simple, the material is suitable for large-scale production, and the material is particularly suitable for filling and heat insulation of consumer electronic products such as PD fast charging power sources.

Description

Technical Field

[0001] This invention relates to the field of thermal management materials technology, and more specifically, to a semi-cured aerogel thermal insulation mud and its preparation method. Background Technology

[0002] As consumer electronics products (such as PD fast charging power banks, smartphones, and tablets) become smaller and more powerful, internal thermal management has become crucial. Effective thermal insulation is key to preventing heat transfer to the device casing, thus avoiding a degraded user experience and device damage.

[0003] Currently, commonly used thermal insulation materials mainly exist in the form of pre-formed sheets, boards, or liquid coatings. Sheets and boards have fixed shapes, making it difficult to achieve tight fit and effective filling in the complex or confined internal spaces of electronic devices, resulting in problems such as inconvenient installation and high contact thermal resistance. Although liquid coatings have good filling properties, they pose risks of dripping, contaminating non-target areas, and potentially causing stress or cracking after curing, and they are difficult to use for precise "point-to-point" thermal insulation.

[0004] Therefore, there is an urgent need in this field for a new type of thermal management material that can adapt to complex structures, achieve good filling, be precisely applied to heat-generating parts, and possess excellent thermal insulation properties, low stress, and multiple protective functions. Summary of the Invention

[0005] To address the problems of poor shape adaptability, inconvenient installation, low insulation accuracy, and easy stress generation in existing thermal insulation materials, a semi-cured aerogel thermal insulation mud and its preparation method are provided.

[0006] A semi-cured aerogel insulation mud, characterized in that it comprises, by weight percentage: Vinyl silicone oil: 15%-20%; Aerogel powder: 10%-20%; Calcium carbonate: 45%-55%; Aluminum hydroxide: 5%-15%; Hollow glass microspheres: 0%-10%; Platinum catalyst: 0.01%-0.05%; Hydrogen-containing silicone oil: 2%-5%; Pigment paste: 0.01%-0.03%; The silica aerogel powder, and the platinum catalyst is a platinum complex; The semi-cured state refers to the paste or mud-like state in which the material is not fully cross-linked after preparation. It can be shaped by hand or with tools during use, and can be fully cured by heating or room temperature.

[0007] Furthermore, the hollow glass microspheres are used in an amount of 5%-8% by weight.

[0008] The preparation method of the above-mentioned semi-cured aerogel insulation mud includes the following steps: S1: Ingredients Accurately weigh the vinyl silicone oil, aerogel powder, calcium carbonate, aluminum hydroxide, and color paste according to the above weight percentage ratio. If hollow glass microspheres need to be added, weigh them simultaneously and add them to the planetary mixer together. The precise ratio of each component is the key to ensuring the stability of the material performance, and the weighing error must be strictly controlled.

[0009] S2: Initial mixing at atmospheric pressure Start the planetary mixer and stir at 10-50 rpm for 10-30 minutes under normal pressure to ensure that the solid and liquid components are in full contact and initially mixed evenly. The purpose of this step is to break up the agglomeration of the solid components and lay the foundation for subsequent uniform mixing. The speed and time need to be controlled properly to avoid powder flying due to excessive speed or insufficient mixing due to insufficient time.

[0010] S3: Vacuum degassing and stirring The planetary mixer is evacuated to -0.095MPa to -0.1MPa. Under this vacuum condition, the mixer is stirred at a speed of 20-60 rpm for 20-40 minutes. The vacuum environment can effectively remove air entrained in the material and bubbles generated during the mixing process. At the same time, high-speed stirring can further improve the mixing uniformity of each component, forming a fine, bubble-free paste matrix. If bubbles are not fully removed, pores will form inside the material, affecting the thermal insulation performance and structural stability.

[0011] S4: Add catalyst and crosslinking agent mixture Under vacuum or inert gas (such as nitrogen) protection, platinum catalyst and hydrogen-containing silicone oil are added to the paste matrix obtained in step S3, and stirring is continued at a speed of 10-30 rpm for 5-15 minutes to ensure uniform mixing. Using vacuum or inert gas protection can prevent platinum catalyst from being contaminated and deactivated by impurities in the air, ensuring the smooth progress of the catalytic reaction. Hydrogen-containing silicone oil, as a crosslinking agent, undergoes an addition reaction with vinyl silicone oil under the action of platinum catalyst, so that the material forms a preliminary crosslinked structure and remains in a semi-cured state.

[0012] S5: After the material is discharged and mixed, stop the planetary mixer, break the vacuum (if it is a vacuum environment), and discharge the material to obtain the semi-cured aerogel insulation mud. The discharged material can be sealed and stored to avoid excessive cross-linking after contact with air, which would affect its plasticity during use.

[0013] The advantages of this invention are: 1. Excellent thermal insulation performance: Through the extremely low thermal conductivity of silica aerogel powder, and the synergistic effect of fillers such as calcium carbonate and hollow glass microspheres (if added), the thermal conductivity of the material is reduced to about 0.03 W / (m·K), which is far superior to traditional thermal insulation materials. It can effectively block heat transfer and has a significant thermal insulation effect.

[0014] 2. Excellent shape adaptability and filling properties: The material is in the form of semi-solid mud and has extremely high plasticity. It can be shaped into any shape by hand or with tools. It can perfectly fill irregular gaps, narrow spaces and the space between heat-generating devices and the shell inside electronic products, and fit tightly to the contact surface. This solves the problem of poor adhesion of traditional sheets and boards, and avoids the problem of flow and pollution of liquid coatings.

[0015] 3. Low-stress application characteristics: The soft, mud-like texture of the material minimizes stress on precision electronic components during the filling process and after curing. This effectively avoids the risk of deformation or damage to electronic devices caused by material expansion or contraction, making it suitable for stress-sensitive precision electronic products.

[0016] 4. Precise heat insulation at specific points: The material can be precisely placed on the surface of specific heat sources (such as transformers and MOSFETs in PD fast charging power supplies) to achieve efficient and precise heat management and prevent heat from spreading to the device casing. Experimental verification shows that when the heat insulation mud of this invention is applied to a 65W PD fast charging power supply, the hot spot temperature of the casing can be reduced by 4.0-5.2℃, significantly improving the user experience.

[0017] 5. Multifunctional integration: The material not only has excellent thermal insulation properties, but also good flame retardant properties due to the addition of aluminum hydroxide. At the same time, the synergistic effect of the vinyl silicone oil matrix and various fillers gives the material good electrical insulation and certain shock absorption and cushioning functions. It can provide comprehensive protection for electronic products with thermal insulation, flame retardancy, insulation and shock absorption, reduce the use of single-function materials, and save internal space of equipment.

[0018] 6. Simple preparation process: The preparation method of the present invention can be completed by only the steps of atmospheric pressure mixing, vacuum degassing and catalytic crosslinking in a planetary mixer. The process is simple, the operating parameters are easy to control, and there is no need for complicated equipment and harsh production conditions. It is suitable for large-scale industrial production and has low production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of semi-cured aerogel insulation mud used in electronic devices.

[0021] Attached image labels: 1. PCB boards and heat-generating components of electronic devices; 2. Semi-cured aerogel insulation putty; 3. Heat sinks; 4. Housings of electronic devices. Detailed Implementation

[0022] To address the problems of poor shape adaptability, inconvenient installation, low insulation accuracy, and easy stress generation in existing thermal insulation materials, a semi-cured aerogel thermal insulation mud and its preparation method are provided.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terms such as “inner,” “middle,” and “one” used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of the invention, and this is hereby stated.

[0025] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0026] The technical solution of the present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments. Example 1

[0027] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 18%, silica aerogel powder: 15%, calcium carbonate: 50%, aluminum hydroxide: 10%, platinum complex catalyst: 0.03%, hydrogen-containing silicone oil: 4.5%, color paste: 0.02%.

[0028] Its preparation method includes the following steps: S1: Weigh each component according to the above ratio, and add vinyl silicone oil, silica aerogel powder, calcium carbonate, aluminum hydroxide and color paste to the planetary mixer; S2: Stir at 30 rpm for 20 minutes under normal pressure until initially mixed evenly; S3: Vacuum to -0.098MPa, stir at 50 rpm for 30 minutes to remove air bubbles and form a paste-like matrix; S4: Under nitrogen protection, add platinum complex catalyst and hydrogen-containing silicone oil, and stir at 20 rpm for 10 minutes until evenly mixed; S5: Discharge the material to obtain semi-solidified aerogel insulation mud.

[0029] Application effect test: The heat insulation material was manually filled between the heat-generating components (transformer, switching tube) and the outer shell of the 65W PD fast charging power supply, with a thickness of about 2mm. After running at full load (65W) for 30 minutes at an ambient temperature of 25℃ until the temperature stabilized, the hot spot temperature of the outer shell was measured with a thermal imager to be 63.8℃, which is 4.7℃ lower than the reference temperature (68.5℃) without heat insulation material. Example 2

[0030] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 16%, silica aerogel powder: 12%, calcium carbonate: 48%, aluminum hydroxide: 12%, hollow glass microspheres: 5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 5%, color paste: 0.01%.

[0031] The preparation method is the same as in Example 1.

[0032] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 64.2℃, which was 4.3℃ lower than the reference temperature. Example 3

[0033] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 19%, silica aerogel powder: 12%, calcium carbonate: 52%, aluminum hydroxide: 8%, hollow glass microspheres: 5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 4.5%, color paste: 0.03%.

[0034] The preparation method is the same as in Example 1.

[0035] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 63.5℃, which was 5.0℃ lower than the reference temperature. Example 4

[0036] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 14%, silica aerogel powder: 20%, calcium carbonate: 45%, aluminum hydroxide: 12%, hollow glass microspheres: 6.5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0037] The preparation method is the same as in Example 1.

[0038] Application effect test: Using the same test conditions and methods as in Implementation 1, the hot spot temperature of the casing was 63.3℃, ​​which was 5.2℃ lower than the reference temperature. Example 5

[0039] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 15%, silica aerogel powder: 10%, calcium carbonate: 48%, aluminum hydroxide: 10%, hollow glass microspheres: 14.5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0040] The preparation method is the same as in Example 1.

[0041] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 64.5℃, which was 4.0℃ lower than the reference temperature. Example 6

[0042] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 15%, silica aerogel powder: 16%, calcium carbonate: 49%, aluminum hydroxide: 10%, hollow glass microspheres: 7.5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0043] The preparation method is the same as in Example 1.

[0044] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 63.9℃, which was 4.6℃ lower than the reference temperature. Example 7

[0045] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 15%, silica aerogel powder: 14%, calcium carbonate: 47%, aluminum hydroxide: 10%, hollow glass microspheres: 11.5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0046] The preparation method is the same as in Example 1.

[0047] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 64.0℃, which was 4.5℃ lower than the reference temperature. Example 8

[0048] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 17%, silica aerogel powder: 15%, calcium carbonate: 50%, aluminum hydroxide: 10%, hollow glass microspheres: 5.5%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0049] The preparation method is the same as in Example 1.

[0050] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 63.7℃, which was 4.8℃ lower than the reference temperature. Example 9

[0051] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 18.5%, silica aerogel powder: 17%, calcium carbonate: 46%, aluminum hydroxide: 10%, hollow glass microspheres: 6%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0052] The preparation method is the same as in Example 1.

[0053] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 63.4℃, which was 5.1℃ lower than the reference temperature. Example 10

[0054] A semi-cured aerogel insulation mortar, by weight percentage, comprises: Vinyl silicone oil: 19.5%, silica aerogel powder: 11%, calcium carbonate: 53%, aluminum hydroxide: 10%, hollow glass microspheres: 4%, platinum complex catalyst: 0.02%, hydrogen-containing silicone oil: 2.45%, color paste: 0.03%.

[0055] The preparation method is the same as in Example 1.

[0056] Application effect test: Using the same test conditions and methods as in Example 1, the hot spot temperature of the casing was 64.4℃, which was 4.1℃ lower than the reference temperature.

[0057] Table 1: Hot Spot Temperature Measurement Table for Casing

[0058] The following conclusions can be drawn from the analysis of the results of each embodiment: Key influencing factor: The amount of silica aerogel powder used is the core factor determining the thermal insulation performance of the thermal insulation mud. Within the range of 10%-20%, the higher the proportion, the better the thermal insulation effect. When the amount reaches 20%, the thermal insulation mud can reduce the temperature of the 65W PD fast charging power supply shell by 5.2℃.

[0059] Key to synergistic effect: Hollow glass microspheres need to be used in a reasonable range of 5%-8% to form a synergistic thermal insulation system with silica aerogel powder. If added in excess (such as 14.5% in Example 5), it will disrupt the ratio balance of each component and reduce the thermal insulation performance. The dosage of matrix components such as vinyl silicone oil and calcium carbonate, as well as filler components, needs to be controlled to ensure the proportion of the core thermal insulation filler in order to achieve the best thermal insulation effect.

[0060] Overall performance adaptability: All 10 examples of the heat insulation mud can achieve a cooling effect of more than 4.0℃, and also have plasticity, low stress, flame retardancy and other properties. Among them, the composition ratio of Example 4 (14% vinyl silicone oil, 20% silica aerogel powder, 45% calcium carbonate, 12% aluminum hydroxide, 6.5% hollow glass microspheres, 0.02% platinum catalyst, 2.45% hydrogen-containing silicone oil, and 0.03% color paste) is the optimal solution. It has outstanding heat insulation performance and the proportion of each component is balanced, which can take into account both heat insulation effect and material formability.

[0061] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be construed that the specific implementation of the present invention is limited to these descriptions. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A semi-cured aerogel thermal mud, characterized in that, According to the weight percentage, comprising: Vinyl silicone oil: 15%-20%; Aerogel powder: 10%-20%; Calcium carbonate: 45%-55%; Aluminum hydroxide: 5%-15%; Hollow glass microspheres: 0%-10%; Platinum gold catalyst: 0.01%-0.05%; Hydrogen-containing silicone oil: 2%-5%; Color paste: 0.01%-0.03%; The silica aerogel powder, the platinum gold catalyst is a platinum gold complex; The semi-cured state is a paste or mud state after the material preparation is completed, which can be shaped manually or by tools, and can be completely cured by heating or room temperature later.

2. The semi-cured aerogel thermal mud according to claim 1, wherein, The weight percentage of the hollow glass microspheres is 5%-8%.

3. A process for the preparation of semi-solid aerogel thermal insulation slurry as claimed in claim 1 or 2, wherein the process comprises of the steps of: Comprising the following steps: S1: according to the weight percentage of claim 1 or 2, vinyl silicone oil, aerogel powder, calcium carbonate, aluminum hydroxide and color paste are added to the planetary mixer, if hollow glass microspheres are needed, they are added to the planetary mixer at the same time; S2: start the planetary mixer, stir at 10-50 revolutions per minute under normal pressure for 10-30 minutes, so that the components are preliminarily mixed uniformly; S3: the planetary mixer is vacuumized to-0.095MPa to-0.1MPa, and stirred at 20-60 revolutions per minute under the vacuum environment for 20-40 minutes, so that the bubbles are removed sufficiently, and a fine paste matrix is formed; S4: under vacuum or inert gas protection, platinum gold catalyst and hydrogen-containing silicone oil are added to the paste matrix obtained in step S3, and stirring is continued at 10-30 revolutions per minute for 5-15 minutes, so that they are mixed uniformly; S5: discharge, obtain the semi-cured aerogel thermal insulation mud.

4. The production method according to claim 3, characterized by, In step S2, the stirring speed is 30 revolutions per minute, and the stirring time is 20 minutes.

5. The preparation method according to claim 3, characterized in that, In step S3, the vacuum degree is-0.098MPa, the stirring speed is 50 revolutions per minute, and the stirring time is 30 minutes.

6. The preparation method according to claim 3, characterized in that, In step S4, the stirring speed is 20 revolutions per minute, and the stirring time is 10 minutes.

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