Coating and application thereof, heat exchanger and air conditioner

Abstract

The invention discloses a coating and application thereof, a heat exchanger and an air conditioner. The coating comprises, by weight, 15-40 parts of water-based resin, 1-20 parts of heat conduction filler and 1-10 parts of solvent. Wherein the heat-conducting filler is at least partially a nano filler and comprises a two-dimensional filler and a three-dimensional filler, the particle size of the two-dimensional filler is less than or equal to 3 microns, and the particle size of the three-dimensional filler is 10-800 nm. The coating provided by the embodiment of the invention has high corrosion resistance, high weather resistance and high heat-conducting property, can form a film layer for corrosion resistance of the heat exchanger, has a good corrosion-resistant effect, and does not influence the heat conductivity of the heat exchanger.

Description

Technical Field

[0001] The embodiments of the present application relate to, but are not limited to, the field of anti-corrosion of heat exchangers, and particularly refer to a coating and its uses, a heat exchanger, and an air conditioner. Background Art

[0002] In coastal areas, affected by climate characteristics such as high temperature, high salt, and high irradiation, the heat exchanger of the outdoor unit of an air conditioner is prone to corrosion phenomena such as coating fading and powdering, resulting in poor heat exchange effect. In order to enhance the anti-corrosion effect of the heat exchanger, currently, the method of directly thickening the primer can be adopted. However, too thick a coating will cause defects such as slow heat transfer and low energy efficiency of the heat exchanger. In addition, simply thickening the coating cannot solve the problem of ultraviolet aging resistance of the coating, and the coating will still fade and crack due to aging, resulting in a greatly reduced anti-corrosion effect. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of the present application.

[0004] The embodiments of the present application provide a coating and its uses, a heat exchanger, and an air conditioner. The coating has high anti-corrosion, high weather resistance, and high thermal conductivity, and can form a film layer for the anti-corrosion of the heat exchanger, not only having a good anti-corrosion effect, but also not affecting the thermal conductivity of the heat exchanger.

[0005] The embodiments of the present application provide a coating. 100 parts by weight of the coating includes: 15 to 40 parts of waterborne resin, 1 to 20 parts of thermal conductive filler, and 1 to 10 parts of solvent;

[0006] Wherein, at least part of the thermal conductive filler is nano filler, including two-dimensional filler and three-dimensional filler. The particle size of the two-dimensional filler is ≤ 3 μm, and the particle size of the three-dimensional filler is 10 nm to 800 nm.

[0007] In an exemplary embodiment of the present application, the particle size of the two-dimensional filler can be 0.5 μm to 2 μm.

[0008] In an exemplary embodiment of the present application, the particle size of the three-dimensional filler can be 10 nm to 200 nm.

[0009] In an exemplary embodiment of the present application, the thickness of the two-dimensional filler can be ≤ 100 nm.

[0010] In an exemplary embodiment of the present application, the thickness of the two-dimensional filler can be 1 nm to 30 nm.

[0011] In an exemplary embodiment of the present application, the weight ratio of the two-dimensional filler to the three-dimensional filler can be 3:1 to 9:1.

[0012] In an exemplary embodiment of the present application, 100 parts by weight of the coating may include: 20 to 30 parts of an aqueous resin, 1 to 8 parts of a thermal conductive filler, and 1 to 10 parts of a solvent.

[0013] In an exemplary embodiment of the present application, the degree of orientation of the thermal conductive filler after the coating is cured may be 50% to 80%.

[0014] In an exemplary embodiment of the present application, the two-dimensional filler may be selected from any one or more of graphene and its derivatives, boron nitride, and molybdenum disulfide.

[0015] In an exemplary embodiment of the present application, the three-dimensional filler may be selected from any one or more of graphite, carbon black, titanium dioxide, silica, silicon carbide, and mica.

[0016] The three-dimensional filler may be selected from any one or more of graphite and carbon black.

[0017] In an exemplary embodiment of the present application, the aqueous resin may be selected from any one or more of epoxy-modified acrylic resin, organofluorine-modified aqueous acrylic resin, polyurethane-modified aqueous acrylic resin, organosilicon-modified aqueous acrylic resin, modified polyurethane, epoxy resin, polyaniline, and polyamide resin.

[0018] In an exemplary embodiment of the present application, the solvent may be selected from any one or more of alcohol ether solvents and ester solvents.

[0019] In an exemplary embodiment of the present application, 100 parts by weight of the coating may further include: 0 to 10 parts of a pigment, 0 to 8 parts of an additive, and the balance of water;

[0020] The additive may be selected from any one or more of a toughening agent, a defoaming agent, a film-forming agent, a thickening agent, a dispersing agent, a coupling agent, a leveling agent, an antibacterial agent, and an antioxidant.

[0021] The embodiments of the present application also provide the use of the coating provided in the embodiments of the present application for anti-corrosion.

[0022] The embodiments of the present application also provide a heat exchanger, the heat exchanger includes an anti-corrosion and thermal conductive layer, and the anti-corrosion and thermal conductive layer is formed by the coating provided in the embodiments of the present application.

[0023] In an exemplary embodiment of the present application, the dry film thickness per side of the anti-corrosion and thermal conductive layer on the heat exchanger may be 1 g / m 2 to 5 g / m 2 .

[0024] The embodiments of the present application also provide an air conditioner, and the air conditioner includes the heat exchanger provided in the embodiments of the present application.

[0025] In the coating of the embodiment of the present application, nano-thermal conductive fillers are introduced to enhance the barrier property of the coating against corrosion factors such as chemicals, oxygen, and water. The combined use of two-dimensional fillers and three-dimensional fillers can, on the one hand, improve the compactness of the coating and obtain a better anti-corrosion effect, and on the other hand, utilize the difference in the orientation degree of different thermal conductive fillers and the cooperation of different particle shapes to form a multi-level reflection / scattering structure to improve the scattering ability of ultraviolet light, thereby weakening the absorption of ultraviolet light by the resin and significantly enhancing the aging resistance of the coating. Moreover, the two-dimensional filler has high thermal conductivity in the horizontal direction, and the three-dimensional filler has high thermal conductivity in the vertical direction. The combined use of the two-dimensional filler and the three-dimensional filler can improve the overall thermal conductivity of the coating.

[0026] Other features and advantages of the present application will be described in the following specification, and part of them will become obvious from the specification, or be understood by implementing the present application. Other advantages of the present application can be achieved and obtained through the solutions described in the specification. Description of the Drawings

[0027] The drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0028] Figure 1 It is the white light interference electron microscope image of the coating of Embodiment 1 of the present application;

[0029] Figure 2 It is the white light interference electron microscope image of the coating of Comparative Example 1 of the present application;

[0030] Figure 3 It is the scanning electron microscope image of the coating of Embodiment 1 of the present application;

[0031] Figure 4 It is the scanning electron microscope image of Comparative Example 1 of the present application. Detailed Embodiments

[0032] To make the purpose, technical solutions, and advantages of the present application clearer and more understandable, the embodiments of the present application will be described in detail below. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined arbitrarily with each other.

[0033] The embodiment of the present application provides a coating. 100 parts by weight of the coating includes: 15 to 40 parts of a water-based resin, 1 to 20 parts of a thermal conductive filler, and 1 to 10 parts of a solvent;

[0034] Among them, at least part of the thermal conductive filler is a nano-filler, including a two-dimensional filler and a three-dimensional filler. The particle size of the two-dimensional filler is ≤ 3 μm, and the particle size of the three-dimensional filler is 10 nm to 800 nm.

[0035] In the embodiments of the present application, nano-thermal conductive fillers are introduced into the coating to enhance the barrier properties of the coating against corrosion factors such as chemicals, oxygen, and water. The combined use of two-dimensional fillers and three-dimensional fillers can, on the one hand, improve the compactness of the coating and obtain a good anti-corrosion effect, and on the other hand, utilize the difference in the orientation degree of different thermal conductive fillers and the cooperation of different particle shapes to form a multi-level reflection / scattering structure to improve the scattering ability of ultraviolet light, thereby weakening the absorption of ultraviolet light by the resin and significantly enhancing the anti-aging ability of the coating. Moreover, the two-dimensional fillers have high thermal conductivity in the horizontal direction, and the three-dimensional fillers have high thermal conductivity in the vertical direction. The combined use of two-dimensional fillers and three-dimensional fillers can improve the overall thermal conductivity of the coating.

[0036] In an exemplary embodiment of the present application, in 100 parts by weight of the coating, the parts by weight of the aqueous resin can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, etc.; the parts by weight of the thermal conductive filler can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.; the parts by weight of the solvent can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0037] In an exemplary embodiment of the present application, the particle size of the two-dimensional filler can be 0.5 μm to 2 μm. When the particle size of the two-dimensional filler is within the range of ≤2 μm, it can better fill the coating defects, which is beneficial to forming and improving the compactness and thermal conductivity of the coating.

[0038] In an exemplary embodiment of the present application, the particle size of the three-dimensional filler can be 10 nm to 200 nm. When the particle size of the three-dimensional filler is within the range of 10 nm to 200 nm, it can better fill the coating defects, which is beneficial to forming and improving the compactness and thermal conductivity of the coating.

[0039] In an exemplary embodiment of the present application, the thickness of the two-dimensional filler can be ≤100 nm.

[0040] In an exemplary embodiment of the present application, the thickness of the two-dimensional filler can be 1 nm to 30 nm.

[0041] In an exemplary embodiment of the present application, the weight ratio of the two-dimensional filler to the three-dimensional filler can be 3:1 to 9:1. For example, it can be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, etc.

[0042] In an exemplary embodiment of the present application, 100 parts by weight of the coating may include: 20 to 30 parts of an aqueous resin, 1 to 8 parts of a heat-conducting filler, and 1 to 10 parts of a solvent.

[0043] In an exemplary embodiment of the present application, the degree of orientation of the heat-conducting filler after the coating is cured may be 50% to 80%. If the degree of orientation is too low, the barrier property against corrosion factors is insufficient; if the degree of orientation is too high, the scattering effect on ultraviolet light is poor. When the degree of orientation of the heat-conducting filler after curing is in the range of 50% to 80%, the coating formed by the coating of the present application embodiment can have excellent barrier properties and scattering effect on ultraviolet light. The degree of orientation of the heat-conducting filler mainly refers to the degree of orientation of the two-dimensional filler in the coating formed after the coating is cured in the direction parallel to the surface of the coating. The surface of the coating may be parallel to the surface of the heat exchanger coated with the coating, such as the surface of a heat exchange tube or a heat sink (such as an aluminum foil), that is, the degree of orientation of the heat-conducting filler is the degree of orientation of the heat-conducting filler in the direction parallel to the heat exchange tube or the heat sink. The degree of orientation of the filler is affected by the size parameters of the filler and its dosage in the coating, and the roll coating process parameters can also be adjusted by conventional technical means to obtain different degrees of orientation of the filler.

[0044] In an exemplary embodiment of the present application, the heat-conducting filler may include any one or more of graphite, carbon black, titanium dioxide, graphene and its derivatives, boron nitride, molybdenum disulfide, silicon dioxide, silicon carbide, mica.

[0045] In an exemplary embodiment of the present application, the two-dimensional filler may be selected from any one or more of graphene and its derivatives, boron nitride, and molybdenum disulfide.

[0046] In an exemplary embodiment of the present application, the three-dimensional filler may be selected from any one or more of graphite, carbon black, titanium dioxide, silicon dioxide, silicon carbide, and mica.

[0047] In the description of the present application, the derivatives of graphene may include graphene oxide, reduced graphene oxide, alkylated graphene, nitro-graphene nitride graphene, and boronated graphene.

[0048] In an exemplary embodiment of the present application, the aqueous resin may be selected from any one or more of aqueous acrylic resin, aqueous polyurethane, aqueous epoxy resin, aqueous polyaniline, and aqueous polyamide resin. For example, the aqueous resin may be selected from any one or more of epoxy-modified acrylic resin, organofluorine-modified aqueous acrylic resin, polyurethane-modified aqueous acrylic resin, organosilicon-modified aqueous acrylic resin, modified polyurethane, aqueous epoxy resin, aqueous polyaniline, and aqueous polyamide resin. Here, A modified B means introducing A into the main chain or side chain of B. For example, epoxy-modified acrylic resin means introducing an epoxy group into the main chain or side chain of polyacrylic acid.

[0049] In an exemplary embodiment of the present application, the epoxy-modified acrylic resin is a resin obtained after the polymerization of epoxy-modified acrylic acid, and can be any one or a mixture of several of HD-EA604, HD-EA6020, and HD-EA6030 of Xiamen Aikema Chemical Co., Ltd.

[0050] In an exemplary embodiment of the present application, the solvent can be selected from any one or more of alcohol ether solvents and ester solvents.

[0051] In an exemplary embodiment of the present application, 100 parts by weight of the coating may further include: 0 to 10 parts by weight of pigments, 0 to 8 parts by weight of additives, and the balance of water;

[0052] The additives can be selected from any one or more of toughening agents, defoaming agents, film-forming agents, thickening agents (for example, thickening agent PVA-2000), dispersants, coupling agents, leveling agents, antibacterial agents, and antioxidants.

[0053] The embodiment of the present application also provides the use of the coating provided in the above embodiment of the present application for anti-corrosion.

[0054] The embodiment of the present application also provides a heat exchanger, which includes an anti-corrosion heat-conducting layer formed by the coating provided in the above embodiment of the present application.

[0055] In an exemplary embodiment of the present application, the dry film amount per side of the anti-corrosion heat-conducting layer on the heat exchanger can be 1 g / m 2 to 5 g / m 2 .

[0056] The embodiment of the present application also provides an air conditioner, which includes the heat exchanger provided in the above embodiment of the present application.

[0057] The epoxy-modified acrylic resins used in the following examples and comparative examples are all the same, which is HD-EA604 of Xiamen Aikema Chemical Co., Ltd.

[0058] Other raw materials and reagents are all ordinary commercially available products.

[0059] Example 1

[0060] In this embodiment, 100 parts by weight of the coating includes: epoxy-modified acrylic resin: 25 parts by weight; graphene: with a particle size of 0.5 μm < particle size ≤ 1 μm and a thickness of 10 nm to 30 nm, 6 parts by weight; carbon black: with a particle size of 20 nm to 40 nm, 1 part by weight; ethylene glycol monobutyl ether 5 parts by weight; leveling agent byk333 0.5 part by weight; defoaming agent KS604 0.5 part by weight; thickening agent PVA-2000 2 parts by weight; the balance of water.

[0061] After mixing the above materials evenly, and transferring the mixed liquid to the aluminum foil by roll coating process, it is dried at 200 °C for 1 min, and the single-sided dry film weight is measured to be 3 g / m 2 。

[0062] Example 2

[0063] In this example, 100 parts by weight of the coating includes: epoxy-modified acrylic resin: 25 parts by weight; graphene: with a specification of 0.5 μm < particle size ≤ 1 μm and a thickness of 10 nm to 30 nm, 3 parts by weight; titanium dioxide: with a particle size of 20 nm to 40 nm, 1 part by weight; ethylene glycol monobutyl ether 5 parts by weight; leveling agent byk333 0.5 parts by weight; defoaming agent KS604: 0.5 parts by weight; thickening agent PVA-2000 2 parts by weight; balance water.

[0064] After mixing the above materials evenly, and transferring the mixed liquid to the aluminum foil by roll coating process, it is dried at 200 °C for 1 min, and the single-sided dry film weight is measured to be 3 g / m 2 。

[0065] Example 3

[0066] In this example, 100 parts by weight of the coating includes: epoxy-modified acrylic resin: 30 parts by weight; graphene: with a specification of 0.5 μm < particle size ≤ 1 μm and a thickness of 10 nm to 30 nm, 6 parts by weight; carbon black: with a particle size of 20 nm to 40 nm, 1 part by weight; ethylene glycol monobutyl ether 8 parts by weight; leveling agent byk333 0.5 parts by weight; defoaming agent KS604: 0.5 parts by weight; thickening agent PVA-2000 1 part by weight; balance water.

[0067] After mixing the above materials evenly, and transferring the mixed liquid to the aluminum foil by roll coating process, it is dried at 200 °C for 1 min, and the single-sided dry film weight is measured to be 4 g / m 2 。

[0068] Example 4

[0069] In this example, 100 parts by weight of the coating includes: epoxy-modified acrylic resin: 25 parts by weight; graphene: with a specification of 1 μm < particle size ≤ 2 μm and a thickness of 10 nm to 30 nm, 6 parts by weight; titanium dioxide: with a particle size of 20 nm to 40 nm, 2 parts by weight; ethylene glycol monobutyl ether 5 parts by weight; leveling agent byk333 0.5 parts by weight; defoaming agent KS604: 0.5 parts by weight; thickening agent PVA-2000 2 parts by weight; balance water.

[0070] After mixing the above materials evenly, and transferring the mixed liquid to the aluminum foil by roll coating process, it is dried at 200 °C for 1 min, and the single-sided dry film weight is measured to be 3 g / m 2 。

[0071] Example 5

[0072] The difference between this example and Example 1 is only that: the graphene is 8 parts by weight, the carbon black is 2 parts by weight, and the other conditions remain unchanged except for the water consumption.

[0073] Example 6

[0074] The difference between this example and Example 5 is only that: the graphene is replaced by hexagonal boron nitride nanosheets, and the rest remains unchanged.

[0075] Example 7

[0076] The difference between this example and Example 1 is only that: the graphene is 18 parts by weight, the carbon black is 2 parts by weight, and the other conditions remain unchanged except for the water consumption.

[0077] Example 8

[0078] The difference between this example and Example 2 is only that: the particle size of titanium dioxide is 200 nm to 300 nm, and the rest remains unchanged.

[0079] Example 9

[0080] The difference between this example and Example 1 is only that: the graphene is 0.75 parts by weight, the carbon black is 0.25 parts by weight, and the other conditions remain unchanged except for the water consumption.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 4 is only that: titanium dioxide is not added, and the other conditions remain unchanged except for the water consumption.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 1 is only that: carbon black is not added, the graphene is 1 part by weight, and the other conditions remain unchanged except for the water consumption.

[0085] Comparative Example 3

[0086] The difference between this comparative example and Example 1 is only that: carbon black is not added, the graphene is replaced by 1 part of graphene oxide, and the other conditions remain unchanged except for the water consumption.

[0087] Comparative Example 4

[0088] The difference between this comparative example and Example 3 is only that: epoxy modified acrylic resin: 45 parts by weight, the other conditions remain unchanged except for the water consumption; the single-sided dry film weight is 6.5 g / m 2 .

[0089] Comparative Example 5

[0090] The difference between this comparative example and Example 2 is only that: the particle size of graphene is 3 μm to 5 μm, and the rest remains unchanged.

[0091] Comparative Example 6

[0092] The difference between this comparative example and Example 2 is only that: the particle size of graphene is 3 μm to 5 μm, and the particle size of titanium dioxide is 200 nm to 300 nm, and the rest remains unchanged.

[0093] Comparative Example 7

[0094] The difference between this comparative example and Example 4 is only that: the thickness of graphene is 500 nm to 600 nm, and the rest remains unchanged.

[0095] Comparative Example 8

[0096] The difference between this comparative example and Example 4 is only that: the particle size of graphene is 3 μm to 5 μm, and the thickness of graphene is 500 nm to 600 nm, and the rest remains unchanged.

[0097] Test method:

[0098] 1. Test of vertical thermal diffusivity: Test at 50 °C according to Chinese national standard GB / T 22588; since the coating is thin, the thermal conductivity of the product in the horizontal direction is mainly determined by the substrate (aluminum foil in both the examples and comparative examples), and the difference between each formulation is small, and the vertical thermal conductivity is mainly determined by the coating;

[0099] 2. Test of neutral salt spray protection grade: Test for 1500 h according to Chinese national standard GB / T 10125;

[0100] 3. Test of salt spray protection grade after aging resistance: Test according to the standard T / CAS 734—2023 of China Standardization Association;

[0101] The test results are shown in Table 1.

[0102] Table 1 Performance test results of the coatings in the examples and comparative examples

[0103]

[0104] It can be seen that compared with the coatings of the comparative examples, the coatings of the examples of this application are significantly better in terms of thermal conductivity, corrosion protection and aging resistance in the vertical direction.

[0105] Among them, by comparing Comparative Example 1 with Example 4 and Comparative Example 2 with Example 1, it can be seen that the addition of three-dimensional fillers can significantly improve the thermal conductivity, corrosion protection and / or aging resistance of the coating in the vertical direction.

[0106] As can be seen from Examples 1-9, the higher the content of the thermal conductive filler, the better the thermal conductivity of the coating in the vertical direction (in Example 3, due to the relatively large coating thickness, the thermal conductivity of the coating in the vertical direction is inferior to that of the coating in Example 1). However, if the content of the thermal conductive filler is too high, it will lead to a decline in the anti-corrosion and anti-aging properties of the coating, because excessive addition of the thermal conductive filler is likely to form a conductive path, making it more susceptible to corrosion.

[0107] By comparing Comparative Examples 5 and 6 with Example 2, and Comparative Examples 7 and 8 with Example 4, it can be seen that size parameters such as the particle size and thickness of the two-dimensional and three-dimensional fillers have obvious effects on the thermal conductivity, anti-corrosion and anti-aging properties of the coating in the vertical direction.

[0108] Figure 1 It is the white light interference electron micrograph of the coating of Example 1 of the present application; Figure 2 It is the white light interference electron micrograph of the coating of Comparative Example 1 of the present application. It can be seen that the surface morphologies of the coatings of Example 1 and Comparative Example 1 of the present application are different. The surface of the coating formed by the paint containing only two-dimensional fillers is relatively flat, while the surface of the coating formed by the paint containing three-dimensional fillers has more protrusions. Therefore, a multi-level reflection / scattering structure can be formed to improve the reflection / scattering ability of ultraviolet light, thereby weakening the absorption of ultraviolet light by the coating and significantly enhancing the anti-aging ability of the coating.

[0109] Figure 3 It is the scanning electron micrograph of the coating of Example 1 of the present application; Figure 4 It is the scanning electron micrograph of Comparative Example 1 of the present application. Combining Figures 1 to 4 It can be seen that the coating formed in Example 1 of the present application is denser, so it has better barrier properties against corrosion factors such as chemicals, oxygen, and water, and stronger corrosion resistance.

[0110] Although the disclosed embodiments of the present application are as above, the content described is only the embodiments adopted for facilitating the understanding of the present application and is not used to limit the present application. Any person skilled in the art within the scope of the present application can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present application. However, the scope of patent protection of the present application shall still be subject to the scope defined by the appended claims.

Claims

1. A coating, characterized in that, 100 parts by weight of the coating comprises: 15 to 40 parts of an aqueous resin, 1 to 20 parts of a heat-conducting filler, and 1 to 10 parts of a solvent; Wherein, at least part of the heat-conducting filler is a nano-filler, including two-dimensional fillers and three-dimensional fillers, the particle size of the two-dimensional filler ≤ 3μm, and the particle size of the three-dimensional filler is 10nm to 800nm.

2. The coating according to claim 1, wherein The particle size of the two-dimensional filler is 0.5μm to 2μm.

3. The coating according to claim 1, wherein The particle size of the three-dimensional filler is 10nm to 200nm.

4. The coating according to claim 1, wherein The thickness of the two-dimensional filler ≤ 100nm.

5. The coating according to claim 4, wherein The thickness of the two-dimensional filler is 1nm to 30nm.

6. The coating according to claim 1, characterized in that, The weight ratio of the two-dimensional filler to the three-dimensional filler is 3:1 to 9:

1.

7. The coating according to claim 1, characterized in that, 100 parts by weight of the coating further comprises: 20 to 30 parts of an aqueous resin, 1 to 8 parts of a heat-conducting filler, and 1 to 10 parts of a solvent.

8. The coating according to claim 1, wherein The degree of orientation of the heat-conducting filler after the coating is cured is 50% to 80%.

9. The coating according to any one of claims 1 to 8, characterized in that, The two-dimensional filler is selected from any one or more of graphene and its derivatives, boron nitride, and molybdenum disulfide; and / or, The three-dimensional filler is selected from any one or more of graphite, carbon black, titanium dioxide, silica, silicon carbide, and mica.

10. The coating according to any one of claims 1 to 8, characterized in that, The aqueous resin is selected from any one or more of epoxy-modified acrylic resin, organofluorine-modified aqueous acrylic resin, polyurethane-modified aqueous acrylic resin, organosilicon-modified aqueous acrylic resin, modified polyurethane, epoxy resin, polyaniline, and polyamide resin.

11. The coating according to any one of claims 1 to 8, characterized in that, The solvent is selected from any one or more of alcohol ether solvents and ester solvents.

12. The coating according to any one of claims 1 to 8, characterized in that, 100 parts by weight of the coating further comprises: 0 to 10 parts of a pigment, 0 to 8 parts of an additive, and the balance of water; The additive is selected from any one or more of a toughening agent, a defoaming agent, a film-forming agent, a thickening agent, a dispersing agent, a coupling agent, a leveling agent, an antibacterial agent, and an antioxidant. Use of the coating according to any one of claims 1 to 12 for anti-corrosion.

14. A heat exchanger, characterized in that, Comprising an anti-corrosion heat-conducting layer formed of the coating according to any one of claims 1 to 12.

15. The heat exchanger according to claim 14, characterized in that, The single-sided dry film thickness of the anti-corrosion and heat-conducting layer on the heat exchanger is 1 g / m 2 to 5 g / m 2 .

16. An air conditioner, characterized in that, Comprising a heat exchanger according to claim 14 or 15.

Images