Anti-condensation coating material, and preparation method and application thereof

Abstract

The application provides a condensation-preventing coating, a preparation method and application thereof. The condensation-preventing coating comprises the following components: a water-based emulsion, aerogel powder, hollow glass microbeads, diatomite, polyvinyl alcohol, sodium polyacrylate and water. The coating formed by the condensation-preventing coating has good heat preservation and insulation effects, can effectively reduce the water vapor dew point of the coating surface, realizes the condensation-preventing effect, and effectively solves the condensation problem of energy storage batteries.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to an anti-condensation coating, its preparation method, and its application. Background Technology

[0002] Condensation in energy storage batteries refers to the phenomenon where water vapor in the air condenses into liquid water on the surface of the battery pack or related equipment under specific temperature and humidity conditions. The causes of condensation in energy storage batteries include: 1. Temperature differences: When the surface temperature of the battery pack or liquid cooling plate is lower than the dew point temperature of the surrounding air, water vapor in the air will condense into water droplets on these surfaces. For example, in a liquid-cooled energy storage system, the low temperature of the liquid cooling plate easily leads to condensation. 2. Humidity: High humidity is a significant factor in condensation. In environments with high humidity, the high water vapor content in the air makes it easier to reach the dew point temperature and condense. 3. Poor sealing: If the battery pack or energy storage container is not well-sealed, external moisture can easily enter the interior, increasing the risk of condensation. For example, if the liquid cooling pipes in a liquid-cooled energy storage system are not completely sealed, outside air can easily enter the battery compartment, leading to condensation.

[0003] Condensation in energy storage batteries can negatively impact performance and safety, primarily affecting: 1. Electrical malfunctions: Condensation can cause moisture absorption by internal electronic components, reducing insulation performance and potentially leading to short circuits, thus disrupting normal equipment operation. 2. Equipment corrosion: Condensed water droplets can corrode the surfaces of the battery pack and related equipment, shortening their lifespan. 3. Performance degradation: Condensation affects battery performance, reducing charge / discharge efficiency and lifespan. 4. Short-circuit risk: Condensed water droplets can fall onto internal electronic components, causing electrical short circuits. For example, water droplets condensing on the outside of a liquid cooling plate falling onto the lower battery pack can easily cause short circuits in cells and electronic components, potentially leading to fires and rendering the entire energy storage system unusable.

[0004] Currently, the common method for preventing condensation in new energy storage batteries is to adhere insulation cotton to the surface of the battery's liquid cooling plate. This achieves insulation of the plate and solves the condensation problem caused by temperature differences. However, the construction process of wrapping the battery with insulation cotton is complex, especially for irregularly shaped structures requiring protection. Furthermore, the joints and seams after construction allow air to enter the insulation layer, causing condensation on the surface of the battery's liquid cooling plate. This often results in water retention within the insulation cotton, thus failing to effectively prevent condensation. Moreover, removing and reinstalling the insulation layer is cumbersome during battery repairs, impacting maintenance progress.

[0005] In addition, the anti-condensation coatings currently available on the market mainly address two issues: one is superhydrophobic coatings, which can only allow condensation to flow away quickly after it occurs through the hydrophobic effect of the coating, but cannot prevent condensation from occurring, and are therefore unsuitable for anti-condensation applications in energy storage batteries; the other is anti-condensation sealing materials, which are mainly used for sealing electrical cabinets and cannot prevent condensation on battery liquid cooling plates.

[0006] Therefore, there is an urgent need to develop an anti-condensation coating to solve the condensation problem in new energy batteries. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide an anti-condensation coating, its preparation method, and its application. The coating formed by the anti-condensation coating has excellent thermal insulation properties and can effectively reduce the dew point of water vapor on the coating surface, thus achieving the function of preventing condensation.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides an anti-condensation coating, the anti-condensation coating comprising the following components: an aqueous emulsion, aerogel powder, hollow glass microspheres, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate, and water.

[0010] In this invention, the anti-condensation coating incorporates aerogel powder and hollow glass microspheres as heat-insulating fillers, which reduces the thermal conductivity of the coating layer. This achieves heat insulation by blocking heat transfer, keeping the coating surface temperature above the dew point. Simultaneously, diatomaceous earth, polyvinyl alcohol, and sodium polyacrylate are added as water-absorbing and water-locking fillers to effectively absorb water vapor from the air, reducing local humidity around the coating and thus lowering the dew point, solving the condensation problem in batteries. Furthermore, the anti-condensation coating can be directly sprayed or brushed onto the surface of equipment requiring anti-condensation, such as liquid cooling plates, making application convenient.

[0011] Preferably, the aqueous emulsion includes an aqueous acrylic emulsion.

[0012] Preferably, the aerogel powder has an average particle size of 10–50 μm, such as 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, or 45 μm.

[0013] Preferably, the aerogel powder is silica aerogel powder.

[0014] Preferably, the average particle size of the hollow glass microspheres is 5 to 50 μm, such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm or 45 μm.

[0015] Preferably, the average particle size of the diatomaceous earth is 45-100 μm, such as 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm or 95 μm.

[0016] Preferably, the number average molecular weight of the polyvinyl alcohol is 20,000 to 100,000, such as 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, or 90,000.

[0017] In this invention, the number average molecular weight of the polyvinyl alcohol is preferably 20,000 to 100,000. If the number average molecular weight of the polyvinyl alcohol is too high, its water solubility is poor and its water absorption rate is low, resulting in a decrease in the anti-condensation properties of the prepared anti-condensation coating. If the number average molecular weight of the polyvinyl alcohol is too low, its mechanical properties are poor, resulting in lower physical and mechanical properties of the prepared anti-condensation coating.

[0018] Preferably, the degree of hydrolysis of the polyvinyl alcohol is 87% to 98%, such as 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, or 97%, and more preferably 87% to 89%.

[0019] In this invention, the degree of hydrolysis of polyvinyl alcohol is preferably 87-89%, and it has good water solubility, dissolving quickly in both cold and hot water. When the degree of hydrolysis of polyvinyl alcohol is >89%, it usually needs to be heated to above 60°C to dissolve completely.

[0020] Preferably, the average particle size of the polyvinyl alcohol is 50-150 μm, such as 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm or 140 μm.

[0021] Preferably, the number average molecular weight of the sodium polyacrylate is 30,000 to 50,000, such as 32,000, 34,000, 36,000, 38,000, 40,000, 42,000, 44,000, 46,000, or 48,000.

[0022] In this invention, the number average molecular weight of the sodium polyacrylate is preferably 30,000 to 50,000. If the number average molecular weight of the sodium polyacrylate is too high, the sodium polyacrylate is not easy to dissolve and has a strong thickening effect, which is not conducive to the uniform dispersion of each component, resulting in a decrease in the anti-condensation effect of the anti-condensation coating. If the number average molecular weight of the sodium polyacrylate is too low, the sodium polyacrylate absorbs water quickly, but has weak water retention performance, resulting in a decrease in the anti-condensation effect of the anti-condensation coating.

[0023] Preferably, the average particle size of the sodium polyacrylate is 50-200 μm, such as 70 μm, 90 μm, 110 μm, 130 μm, 150 μm, 170 μm or 190 μm.

[0024] Preferably, the water comprises deionized water.

[0025] Preferably, the anti-condensation coating comprises the following components by weight percentage: 10%–60% aqueous emulsion (e.g., 15%, 20%, 30%, 35%, 40%, 45%, 50%, or 55%, etc.), 15%–20% aerogel powder (e.g., 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, or 19.5%, etc.), and 10%–20% hollow glass microspheres (e.g., 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or...). 19%, etc.), diatomaceous earth 5%–10% (5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9% or 9.5%, etc.), polyvinyl alcohol 0.5%–10% (e.g. 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%, etc.), sodium polyacrylate 0.5%–10% (e.g. 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%, etc.), and water 1%–20% (e.g. 2%, 4%, 6%, 8%, 10%, 12%, 16% or 18%, etc.).

[0026] Preferably, the anti-condensation coating further includes mica powder.

[0027] Preferably, the average particle size of the mica powder is 10-50 μm, such as 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm or 45 μm.

[0028] Preferably, the mica powder accounts for 10% to 20% of the total mass of the anti-condensation coating, for example, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19%, etc.

[0029] Preferably, the anti-condensation coating further includes a dispersant, a film-forming aid, a defoamer, and a rheology modifier.

[0030] Preferably, the mass of the dispersant is 0.5% to 5% of the total mass of the anti-condensation coating, for example, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5%, etc.

[0031] Preferably, the film-forming aid is 0.5% to 5% of the total mass of the anti-condensation coating, for example, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5%, etc.

[0032] Preferably, the defoamer accounts for 0.5% to 5% of the total mass of the anti-condensation coating, for example, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, or 4.5%, etc.

[0033] Preferably, the rheology modifier is 0.5% to 5% of the total mass of the anti-condensation coating, for example, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5%, etc.

[0034] In a second aspect, the present invention provides a method for preparing the anti-condensation coating as described in the first aspect, the method comprising the following steps: mixing an aqueous emulsion, aerogel powder, hollow glass microspheres, optionally mica powder, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate, water, optionally a dispersant, optionally a film-forming aid, optionally a defoamer, and optionally a rheology modifier to obtain the anti-condensation coating.

[0035] In this invention, polyvinyl alcohol and sodium polyacrylate are dissolved during the mixing process.

[0036] Thirdly, the present invention provides an application of the anti-condensation coating as described in the first aspect on battery modules, battery packs or electrical devices.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The anti-condensation coating of this invention reduces the thermal conductivity of the coating by adding aerogel powder and hollow glass microspheres as heat-insulating fillers. This achieves heat insulation by blocking heat transfer, keeping the coating surface temperature above the dew point. Simultaneously, diatomaceous earth, polyvinyl alcohol, and sodium polyacrylate are added for water absorption and retention, effectively absorbing water vapor from the air and reducing local humidity around the coating, thereby lowering the dew point and solving the condensation problem of batteries. Furthermore, the anti-condensation coating can be directly sprayed or brushed onto the surface of equipment requiring anti-condensation, such as liquid cooling plates, making application convenient. On a substrate at 5°C, at 25°C and 50% humidity, the condensation time of the coating is ≥23 minutes, and the tensile strength of the anti-condensation coating film is ≥1 MPa. Preferably, the condensation time is ≥25 minutes, and the tensile strength of the anti-condensation coating film is ≥2 MPa. Detailed Implementation

[0039] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention.

[0040] Example 1

[0041] This embodiment provides an anti-condensation coating and its preparation method. The anti-condensation coating comprises the following components by mass percentage: 30% aqueous acrylic emulsion (manufacturer: Badifu, brand name: 998F), 20% silica aerogel powder (average particle size: 25 μm), 12% hollow glass microspheres (average particle size: 30 μm), 12% mica powder (average particle size: 20 μm), 6% diatomaceous earth (average particle size: 70 μm), 9% polyvinyl alcohol (number average molecular weight: 50,000, degree of hydrolysis: 88%, average particle size: 90 μm), 3% sodium polyacrylate (number average molecular weight: 40,000, average particle size: 100 μm), and 8% deionized water.

[0042] The preparation method includes the following steps: water-based acrylic emulsion, silica aerogel powder, hollow glass microspheres, mica powder, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate and deionized water are stirred and mixed at 25°C for 60 min to dissolve polyvinyl alcohol and sodium polyacrylate and to uniformly disperse each component to obtain the anti-condensation coating.

[0043] Example 2

[0044] This embodiment provides an anti-condensation coating and its preparation method. The anti-condensation coating comprises the following components by mass percentage: 18% aqueous acrylic emulsion (manufacturer: Badifu, brand name: 998F), 15% silica aerogel powder (average particle size: 50 μm), 15% hollow glass microspheres (average particle size: 10 μm), 10% mica powder (average particle size: 50 μm), 10% diatomaceous earth (average particle size: 50 μm), and polyvinyl alcohol (number average molecular weight: 100,000, degree of alcoholysis: 98%, average particle size: 8 μm). The composition includes: 2% sodium polyacrylate (number average molecular weight 30,000, average particle size 90μm), 9% dispersant (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade SN5040), 0.5% film-forming aid (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade 12-ol ester), 0.5% defoamer (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade SN154), 0.5% rheology modifier (manufacturer: Huizhou Xintu New Materials Co., Ltd., grade XT-602A), and 19% deionized water.

[0045] The preparation method includes the following steps: water-based acrylic emulsion, silica aerogel powder, hollow glass microspheres, mica powder, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate, dispersant, film-forming aid, defoamer, rheology modifier and deionized water are stirred and mixed at 25°C for 70 min to dissolve polyvinyl alcohol and sodium polyacrylate and to uniformly disperse each component to obtain the anti-condensation coating.

[0046] Example 3

[0047] This embodiment provides an anti-condensation coating and its preparation method. The anti-condensation coating comprises the following components by mass percentage: 35% aqueous acrylic emulsion (manufacturer: Badifu, brand name: 998F), 17% silica aerogel powder (average particle size: 10 μm), 10% hollow glass microspheres (average particle size: 30 μm), 10% mica powder (average particle size: 10 μm), 5% diatomaceous earth (average particle size: 100 μm), and polyvinyl alcohol (number average molecular weight: 20000, degree of alcoholysis: 88%, average particle size: 100 μm). The composition includes: 6% sodium polyacrylate (number average molecular weight 50,000, average particle size 80 μm), 7% dispersant (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade SN5040), 2% film-forming aid (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade 12 alcohol ester), 0.5% defoamer (manufacturer: Shanghai Guangbai New Materials Co., Ltd., grade SN154), 1% rheology modifier (manufacturer: Huizhou Xintu New Materials Co., Ltd., grade XT-602A), and 6% deionized water.

[0048] The preparation method includes the following steps: water-based acrylic emulsion, silica aerogel powder, hollow glass microspheres, mica powder, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate, dispersant, film-forming aid, defoamer, rheology modifier and deionized water are stirred and mixed at 25°C for 60 min to dissolve polyvinyl alcohol and sodium polyacrylate and to uniformly disperse each component to obtain the anti-condensation coating.

[0049] Example 4

[0050] This embodiment provides an anti-condensation coating and its preparation method. The only difference between this embodiment and Example 1 is that polyvinyl alcohol (number average molecular weight of 50,000, degree of hydrolysis of 88%, and average particle size of 90 μm) is replaced with the same mass of polyvinyl alcohol (number average molecular weight of 15,000, degree of hydrolysis of 88%, and average particle size of 90 μm). All other conditions are the same as in Example 1.

[0051] Example 5

[0052] This embodiment provides an anti-condensation coating and its preparation method. The only difference between this embodiment and Example 1 is that polyvinyl alcohol (number average molecular weight of 50,000, degree of hydrolysis of 88%, and average particle size of 90 μm) is replaced with the same mass of polyvinyl alcohol (number average molecular weight of 120,000, degree of hydrolysis of 88%, and average particle size of 90 μm). All other conditions are the same as in Example 1.

[0053] Example 6

[0054] This embodiment provides an anti-condensation coating and its preparation method. The only difference between this embodiment and Example 1 is that sodium polyacrylate (number average molecular weight of 40,000 and average particle size of 100 μm) is replaced with the same mass of sodium polyacrylate (number average molecular weight of 20,000 and average particle size of 100 μm). All other conditions are the same as in Example 1.

[0055] Example 7

[0056] This embodiment provides an anti-condensation coating and its preparation method. The only difference between this embodiment and Example 1 is that sodium polyacrylate (number average molecular weight of 40,000 and average particle size of 100 μm) is replaced with the same mass of sodium polyacrylate (number average molecular weight of 60,000 and average particle size of 100 μm). All other conditions are the same as in Example 1.

[0057] Example 8

[0058] This embodiment provides an anti-condensation coating and its preparation method. The only difference between this embodiment and Example 1 is that mica powder is not added, and the mass percentage of the water-based acrylic emulsion (manufacturer: Badifu, brand name: 998F) is adjusted to 42%. Other conditions are the same as in Example 1.

[0059] Comparative Example 1

[0060] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that silica aerogel powder and hollow glass microspheres are not added, and the mass percentage of water-based acrylic emulsion (manufacturer: Badifu, brand name: 998F) is adjusted to 62%. Other conditions are the same as in Example 1.

[0061] Comparative Example 2

[0062] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that diatomaceous earth, polyvinyl alcohol, and sodium polyacrylate are not added, and the mass percentage of waterborne acrylic emulsion (manufacturer: Badifu, brand name: 998F) is adjusted to 48%. Other conditions are the same as in Example 1.

[0063] Comparative Example 3

[0064] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that silica aerogel powder is not added to the heat insulation filler, and the mass percentage of hollow glass microspheres (average particle size of 30 μm) is adjusted to 32%. Other conditions are the same as in Example 1.

[0065] Comparative Example 4

[0066] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that hollow glass microspheres are not added to the heat insulation filler, and the mass percentage of silica aerogel powder (average particle size of 25 μm) is adjusted to 32%. Other conditions are the same as in Example 1.

[0067] Comparative Example 5

[0068] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that diatomaceous earth is not added, and the mass percentages of polyvinyl alcohol (number average molecular weight of 50,000, degree of hydrolysis of 88%, and average particle size of 90 μm) and sodium polyacrylate (number average molecular weight of 40,000, and average particle size of 100 μm) are increased proportionally, for a total increase of 6%. Other conditions are the same as in Example 1.

[0069] Comparative Example 6

[0070] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that polyvinyl alcohol is not added, and the mass percentages of diatomaceous earth (average particle size of 70 μm) and sodium polyacrylate (number average molecular weight of 40,000 and average particle size of 100 μm) are increased proportionally, by a total increase of 9%. Other conditions are the same as in Example 1.

[0071] Comparative Example 7

[0072] This comparative example provides an anti-condensation coating and its preparation method. The only difference between this example and Example 1 is that sodium polyacrylate is not added, and the mass percentages of diatomaceous earth (average particle size of 70 μm) and polyvinyl alcohol (number average molecular weight of 50,000, degree of hydrolysis of 88%, average particle size of 90 μm) are increased proportionally by 3%. Other conditions are the same as in Example 1.

[0073] The anti-condensation coatings provided in Examples 1-8 and Comparisons 1-7 were subjected to the following performance tests.

[0074] (1) Anti-condensation: Apply anti-condensation coating to the metal plate of the refrigerator and dry it to form a 1mm thick coating. At 25℃ and 50% humidity, set the temperature of the metal plate of the refrigerator to 5℃ and record the temperature (℃) of the coating surface. At the same time, record the time when condensation appears on the coating surface. The longer the condensation time, the better the anti-condensation effect.

[0075] (2) Tensile strength: The anti-condensation coating was dried to form a 2.0 mm film, which was then die-cut into a standard dumbbell-shaped strip with a thickness of 2.0 mm. The strip was placed on the fixture of the electronic universal tensile testing machine and subjected to tensile testing at a speed of 10 mm / min. The tensile strength at which the strip broke was recorded.

[0076] The test results are shown in Table 1 below:

[0077] Table 1

[0078]

[0079]

[0080] As shown in Table 1, when the anti-condensation coatings provided in Examples 1 to 8 are applied to a substrate at 5°C, the condensation time is ≥23 min at 25°C and 50% humidity, and the tensile strength of the anti-condensation coating film is ≥1 MPa.

[0081] Compared to Example 1, if the number-average molecular weight of polyvinyl alcohol is too low (Example 4), the tensile strength of the film formed by the prepared anti-condensation coating is low, and the mechanical properties are poor; if the number-average molecular weight of polyvinyl alcohol is too high (Example 5), the anti-condensation effect of the prepared anti-condensation coating is poor. Therefore, it can be seen that the present invention, by controlling the number-average molecular weight of polyvinyl alcohol within a specific range, produces an anti-condensation coating with better performance.

[0082] Compared to Example 1, if the number average molecular weight of sodium polyacrylate is too low (Example 6), the anti-condensation performance of the prepared anti-condensation coating decreases; if the number average molecular weight of sodium polyacrylate is too high (Example 7), the anti-condensation performance of the prepared anti-condensation coating decreases. Therefore, it can be seen that the present invention, by controlling the number average molecular weight of sodium polyacrylate within a specific range, produces an anti-condensation coating with better performance.

[0083] Compared to Example 1, if mica powder is not included (Example 8), the mechanical properties of the anti-condensation coating film formed by the prepared coating are reduced.

[0084] Compared with Example 1, if silica aerogel powder and hollow glass microspheres are not added (Comparative Example 1), the coating of the prepared anti-condensation coating has no heat insulation effect and poor anti-condensation effect.

[0085] Compared with Example 1, the anti-condensation performance of the prepared anti-condensation coating decreased if diatomaceous earth, polyvinyl alcohol and sodium polyacrylate (Comparative Example 2) were not added.

[0086] Compared with Example 1, if the anti-condensation coating does not contain silica aerogel powder (Comparative Example 3) or hollow glass microspheres (Comparative Example 4), the surface temperature of the coating formed by the prepared anti-condensation coating decreases, thereby affecting the anti-condensation performance. It can be seen that the anti-condensation coating prepared by the present invention using silica aerogel powder and hollow glass microspheres as heat insulation fillers has better performance.

[0087] Compared to Example 1, the anti-condensation performance of the prepared anti-condensation coating decreased if it did not contain diatomaceous earth (Comparative Example 5), polyvinyl alcohol (Comparative Example 6), or sodium polyacrylate (Comparative Example 6). Therefore, it can be seen that in this invention, the anti-condensation coating prepared by using diatomaceous earth, polyvinyl alcohol, and sodium polyacrylate together as water-absorbing and water-locking fillers has better performance.

[0088] The applicant declares that this invention illustrates an anti-condensation coating, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials in the product, addition of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

Claims

1. An anti-condensation coating for battery modules, battery packs, or electrical devices, characterized in that, The anti-condensation coating comprises the following components by mass percentage: 10%~60% aqueous emulsion, 15%~20% aerogel powder, 10%~20% hollow glass microspheres, 5%~10% diatomaceous earth, 0.5%~10% polyvinyl alcohol, 0.5%~10% sodium polyacrylate, and 1%~20% water; The number average molecular weight of the polyvinyl alcohol is 20,000 to 100,000. The number-average molecular weight of the sodium polyacrylate is 30,000 to 50,000.

2. The anti-condensation coating according to claim 1, characterized in that, The aqueous emulsion includes an aqueous acrylic emulsion.

3. The anti-condensation coating according to claim 1, characterized in that, The aerogel powder has an average particle size of 10~50 μm.

4. The anti-condensation coating according to claim 1, characterized in that, The aerogel powder is silica aerogel powder.

5. The anti-condensation coating according to claim 1, characterized in that, The hollow glass microspheres have an average particle size of 5~50 μm.

6. The anti-condensation coating according to claim 1, characterized in that, The average particle size of the diatomite is 45~100 μm.

7. The anti-condensation coating according to claim 1, characterized in that, The degree of alcoholysis of the polyvinyl alcohol is 87%~98%.

8. The anti-condensation coating according to claim 1, characterized in that, The average particle size of the polyvinyl alcohol is 50~150μm.

9. The anti-condensation coating according to claim 1, characterized in that, The average particle size of the sodium polyacrylate is 50~200 μm.

10. The anti-condensation coating according to claim 1, characterized in that, The water includes deionized water.

11. The anti-condensation coating according to claim 1, characterized in that, The anti-condensation coating also includes mica powder.

12. The anti-condensation coating according to claim 11, characterized in that, The average particle size of the mica powder is 10~50μm.

13. The anti-condensation coating according to claim 11, characterized in that, With the total mass of the anti-condensation coating being 100%, the mass of the mica powder is 10% to 20%.

14. The anti-condensation coating according to claim 1, characterized in that, The anti-condensation coating also includes dispersants, film-forming aids, defoamers, and rheology modifiers.

15. The anti-condensation coating according to claim 14, characterized in that, Based on the total mass of the anti-condensation coating being 100%, the mass of the dispersant is 0.5% to 5%.

16. The anti-condensation coating according to claim 14, characterized in that, Based on the total mass of the anti-condensation coating being 100%, the mass of the film-forming aid is 0.5% to 5%.

17. The anti-condensation coating according to claim 14, characterized in that, Based on the total mass of the anti-condensation coating being 100%, the mass of the defoamer is 0.5% to 5%.

18. The anti-condensation coating according to claim 14, characterized in that, Based on the total mass of the anti-condensation coating being 100%, the mass of the rheology modifier is 0.5% to 5%.

19. A method for preparing an anti-condensation coating as described in any one of claims 1 to 18, characterized in that, The preparation method includes the following steps: mixing an aqueous emulsion, aerogel powder, hollow glass microspheres, optionally mica powder, diatomaceous earth, polyvinyl alcohol, sodium polyacrylate, water, optionally a dispersant, optionally a film-forming aid, optionally a defoamer, and optionally a rheology modifier to obtain the anti-condensation coating.

20. The application of an anti-condensation coating as described in any one of claims 1 to 18 on a battery module, battery pack, or electrical device.

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