A nano-coating, coating for a radiator and its preparation method

Abstract

The present invention discloses a nano-coating for a radiator, a coating layer and a preparation method thereof, relating to the technical field of radiator coating layers. The nano-coating for the radiator comprises the following raw materials for preparation in parts by mass: 40 to 70 parts of polyester resin, 2 to 15 parts of liquid rubber, 0 to 50 parts of thermosetting acrylic resin, 8 to 20 parts of melamine resin, 0 to 15 parts of blocked isocyanate, 0.5 to 2 parts of leveling agent, 0.5 to 1.2 parts of dispersant, 0.2 to 1.5 parts of defoaming agent, 0.2 to 1.5 parts of dryer and 25 to 45 parts of organic solvent. The nano-coating layer for the radiator of the present invention comprises the nano-coating for the radiator. The preparation method of the nano-coating for the radiator is to mix the raw materials for preparation; the preparation method of the nano-coating layer for the radiator is to coat the nano-coating on the surface of the radiator. The thickness of the nano-coating layer for the radiator of the present invention is only 9 to 15 μm, and it has excellent physical and chemical properties, good stability and high adhesion.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiator coatings, and specifically relates to a nano-coating for radiators, a coating and a preparation method thereof. Background Art

[0002] Due to their ultra-thin coating thickness, nanostructured coatings can significantly improve the surface properties of almost all materials without changing the thermal conductivity and surface texture of the materials. Such coatings enhance the surface characteristics of materials without changing their inherent properties and chemical compositions.

[0003] Nano-coating technology plays an important role in many fields such as biomedicine, engineering, military, energy, and aerospace, and has made significant contributions to the technological progress of these industries. Traditional materials and their coatings often have many limitations, such as insufficient durability, poor wear resistance, weak thermal conductivity, insufficient chemical and corrosion resistance, and a decrease in strength. Summary of the Invention

[0004] The present invention provides a nano-coating for radiators, a coating and a preparation method thereof to overcome the above technical problems. The thickness of the nano-coating for radiators of the present invention is controlled within 9 - 15 μm. Through optimized formulations and process flows, significant improvements in the physical and chemical properties of the coating are achieved; in addition, the coating exhibits excellent stability and adhesion, and these characteristics are crucial for improving the performance and durability of radiators.

[0005] The present invention solves the above technical problems through the following technical solutions.

[0006] The present invention discloses a nano-coating for radiators, which comprises the following raw materials prepared by mass parts: 40 - 70 parts of polyester resin, 2 - 15 parts of liquid rubber, 0 - 50 parts of thermosetting acrylic resin, 8 - 20 parts of melamine resin, 0 - 15 parts of blocked isocyanate, 0.5 - 2 parts of leveling agent, 0.5 - 1.2 parts of dispersant, 0.2 - 1.5 parts of defoaming agent, 0.2 - 1.5 parts of drier, and 25 - 45 parts of organic solvent;

[0007] The polyester resin is a hydrogen bond-containing polar polyester resin;

[0008] The liquid rubber is hydroxyl-terminated nitrile liquid rubber; among them, the liquid rubber is a material with multiple hydrogen bonds and strong polarity that can undergo addition polycondensation reactions. This material has good mechanical properties, so it can be made into a wear-resistant, high-strength and corrosion-resistant coating;

[0009] The organic solvent is a mixed solvent of petroleum ether, propylene glycol methyl ether acetate and n-butanol.

[0010] Preferably, the nano-coating for the radiator comprises the following raw materials for preparation in parts by mass: 40 to 65 parts of polyester resin, 2 to 10 parts of liquid rubber, 0 to 50 parts of thermosetting acrylic resin, 8 to 16 parts of melamine resin, 0 to 15 parts of blocked isocyanate, 0.5 to 2 parts of leveling agent, 0.5 to 2 parts of dispersant, 0.2 to 1 part of defoaming agent, 0.2 to 1 part of dryer and 25 to 40 parts of organic solvent;

[0011] More preferably, the nano-coating for the radiator comprises the following raw materials for preparation in parts by mass: 40 to 50 parts of polyester resin, 5 to 8 parts of liquid rubber, 0 to 20 parts of thermosetting acrylic resin, 10 to 15 parts of melamine resin, 0 to 15 parts of blocked isocyanate, 0.5 to 0.8 part of leveling agent, 0.8 to 1 part of dispersant, 0.2 to 0.5 part of defoaming agent, 0.2 to 0.5 part of dryer and 25 to 35 parts of organic solvent.

[0012] The radiator is made of aluminum alloy; preferably, the radiator is made of 1-series aluminum alloy, 5-series aluminum alloy or 6-series aluminum alloy; more preferably, the radiator is made of 1050 aluminum alloy, 3003 aluminum alloy, 5038 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 6082 aluminum alloy or 7075 aluminum alloy; for example, the radiator is made of 5038 aluminum alloy or 6082 aluminum alloy.

[0013] In the present invention, the melamine resin is hexamethoxymethyl melamine resin.

[0014] In the present invention, the leveling agent is a polydimethylsiloxane containing epoxy functional groups.

[0015] In the present invention, the blocked isocyanate is a blocked alicyclic polyisocyanate.

[0016] In the present invention, the dispersant is an organosilicon-modified polydimethylsiloxane. This additive effectively enhances its oil-repellent and water-repellent properties by cross-linking with hydroxyl groups in the system, thereby improving the easy-cleaning effect of the modified adhesive solution. This additive can reduce the viscosity of the system, improve the stability of nanoparticles, and prevent particle flocculation, which is crucial for improving the storage stability of the final product.

[0017] In the present invention, the organic solvent is petroleum ether:propylene glycol methyl ether acetate (PMA):n-butanol in a mass ratio of 30 to 50:30 to 40:10 to 40, for example 50:30:20.

[0018] The petroleum ether is of the 150# type.

[0019] In the present invention, the hydroxyl content of the polyester resin is 15 to 25 mg KOH / g.

[0020] In the present invention, the solid content of the polyester resin is ≥60%.

[0021] In the present invention, the viscosity of the polyester resin at 25 °C is 13000 - 17000 mPa·s.

[0022] In the present invention, the Mw of the polyester resin is ≥2000.

[0023] In the present invention, the solid content of the liquid rubber is ≥98%.

[0024] In the present invention, the hydroxyl content of the liquid rubber is 31 - 42 mg KOH / g.

[0025] In the present invention, the viscosity of the liquid rubber at 40 °C is ≤25 mPa·s.

[0026] In the present invention, the solid content of the melamine resin is ≥98%.

[0027] In the present invention, the viscosity of the melamine resin at 23 °C is 3000 - 6200 mPa·s.

[0028] In the present invention, the viscosity of the thermosetting acrylic resin is 3000 - 5000 mPa·s.

[0029] Among them, adding the thermosetting acrylic resin to the coating can enhance the hardness, adhesion, retort resistance and solvent dissolution resistance of the coating.

[0030] In the present invention, the viscosity of the blocked isocyanate is 4500 - 6500 mPa·s.

[0031] In the present invention, the NCO content of the blocked isocyanate is 7.5 - 8.5 wt%.

[0032] The blocked isocyanate has excellent reactivity, storage stability, fast drying, water resistance and chemical resistance.

[0033] The present invention also discloses a preparation method of the aforementioned nano - coating for radiators, including the following steps: mixing the preparation raw materials to obtain the nano - coating for radiators.

[0034] Among them, the mixing includes the following steps:

[0035] S1. Adding a dispersant, polyester resin, liquid rubber, melamine resin, thermosetting acrylic resin, blocked isocyanate, and leveling agent to an organic solvent and stirring to obtain a first solution;

[0036] S2. Supplementing the organic solvent to the first solution, mixing evenly and then standing to obtain a second solution;

[0037] S3. Add defoamer and dryer in the second solution and stir to obtain the nano - coating for radiators.

[0038] In S1, the stirring speed is 1000 - 1500 rpm, for example, 1200 rpm.

[0039] In S1, the stirring time is 30 - 50 min.

[0040] In S2, the standing time is 15 - 50 min, for example, 30 min.

[0041] In S3, the stirring speed is 500 - 800 rpm.

[0042] In S3, the stirring time is 10 - 15 min.

[0043] After mixing, it needs to be sieved through a 120 - 200 mesh sieve.

[0044] The present invention discloses a nano - coating for radiators, and its preparation raw materials include the nano - coating for radiators as described above.

[0045] In the present invention, the thickness of the nano - coating for radiators is 9 - 15 μm; in the present invention, the glossiness of the nano - coating for radiators is > 20°, preferably 20° - 25°, more preferably 22 - 23°.

[0046] The present invention also discloses a preparation method of the nano - coating for radiators as described above, including the following steps: coating the coating on the surface of the radiator to obtain the nano - coating for radiators.

[0047] The coating method is dip - coating, spraying or flow - coating; preferably, the coating method is spraying.

[0048] Further, the spraying method is low - pressure spraying.

[0049] Further, the nozzle diameter of the spray gun used for spraying is 0.8 - 1.0 mm.

[0050] Further, the distance between the nozzle and the surface of the radiator during spraying is 15 - 18 mm.

[0051] Further, the moving speed of spraying is 10 - 12 m / min.

[0052] After coating, it also includes a curing step.

[0053] Further, the curing temperature is 160 - 175 °C.

[0054] Further, the curing time is 30 - 40 min.

[0055] The nano - coating or nano - paint for heat sinks of the present invention is applied to the surface of a metal heat exchanger.

[0056] Based on common knowledge in the art, the above - mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0058] 1. The thickness range of the nano - coating for heat sinks of the present invention is 9 - 15 μm. The nano - paint for heat sinks uses nano - level terminal - hydroxyl liquid rubber with super - hydrophobic and super - oleophobic properties. The hydroxyl active functional groups of this liquid rubber can react with polyester resin that can undergo addition polycondensation reaction with multiple hydrogen bonds and strong polarity characteristics to form stable covalent bonds, and further react with melamine resin during the curing process under high - temperature conditions to construct a three - dimensional network structure. This process significantly enhances the cross - linking density of the coating and improves the denseness of the coating of the present invention.

[0059] 2. The nano - coating for heat sinks of the present invention has strong adhesion and good comprehensive mechanical properties. In terms of hardness and high - temperature resistance, the coating shows high mechanical strength and thermal stability, and can adapt to high - temperature environments without being prone to deformation or damage. Its neutral salt - spray resistance performance indicates that the coating has good corrosion resistance. The test results of impact strength and abrasion resistance show that the coating can withstand large impact forces and frictional forces and maintain surface integrity. In terms of resistance to chemical media, the coating shows good tolerance to both acids and bases. In addition, the test results of resistance to boiling water, salt water, water, and gasoline further confirm the stable applicability of the coating in aqueous or oily media. The properties of washability resistance, resistance to MEK wiping, and resistance to alcohol wiping indicate the anti - damage ability of the coating when facing physical and chemical wiping. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is the appearance diagram after the washability resistance test of the nano - coating of Example 1 (A) and Comparative Example 1 (B).

[0061] Figure 2 It is the appearance diagram after the salt - spray test of the nano - coating of Example 11.

[0062] Figure 3 It is the appearance diagram after the salt - spray test of the nano - coating of Example 12. DETAILED DESCRIPTION OF THE INVENTION

[0063] To facilitate the understanding of the present invention, the following will describe the present invention more comprehensively and meticulously in combination with preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0064] Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0065] For the raw material related information used in the following examples or comparative examples, refer to Table 1.

[0066] 。

[0067] Note: For the sake of simplicity in testing, in the following examples and comparative examples, an aluminum alloy plate (75mm * 150mm * 0.8mm) is used to replace the radiator for coating the paint, and finally a sample is prepared. The sample includes a nano - coating for the radiator and the aluminum alloy plate; the sample is subjected to subsequent tests.

[0068] Example 1

[0069] 1. The nano - paint for the radiator in this example includes the following raw materials by mass: 40 parts of polyester resin, 2 parts of liquid rubber, 8 parts of melamine resin, 0.5 part of leveling agent, 0.5 part of dispersant, 0.2 part of defoaming agent, 0.2 part of drier, and 35 parts of organic solvent;

[0070] The volume ratio of 150# petroleum ether:PMA:n - butanol in the organic solvent is 50:30:20.

[0071] 2. The preparation method of the nano - paint and coating for the radiator in this example includes the following steps:

[0072] S1. According to the above formula, add 20 parts of organic solvent to the draw - down tank. While maintaining a stirring state of 400 rpm, slowly add the dispersant, polyester resin, liquid rubber, melamine resin, and leveling agent in sequence. Stir at 1200 rpm for 30 min;

[0073] Then add the remaining solvent, mix well, and let it stand for 30 min. Subsequently, while maintaining a stirring speed of 400 rpm, slowly add the defoaming agent and drier, and stir at 500 rpm for 15 min to obtain the nano - paint for the radiator.

[0074] S2. Clean and degrease the surface of the aluminum alloy plate to remove the oxide layer to prevent dust, grease, and rust stains on the surface of the radiator; then use low - pressure spraying, the gun nozzle diameter is 1.0 mm, the nozzle distance from the surface of the aluminum alloy plate is specifically controlled within the range of 15 - 18 mm, and the spraying moving speed is 10 - 12 m / min; then cure at 170 °C for 35 min to obtain the sample.

[0075] The aluminum alloy plate in this example is made of 1050 aluminum alloy.

[0076] Example 2

[0077] The preparation raw material formula of this example is different from that of Example 1, and the other steps and parameters are the same as those of Example 1.

[0078] By mass, the preparation raw materials of this example include 50 parts of polyester resin, 7 parts of liquid rubber, 15 parts of melamine resin, 5 parts of thermosetting acrylic resin, 7 parts of blocked isocyanate, 1 part of leveling agent, 0.7 part of dispersant, 0.7 part of defoaming agent, 0.7 part of dryer and 30 parts of organic solvent.

[0079] During the mixing process in S1 of the coating preparation in this example, thermosetting acrylic resin and blocked isocyanate are also added. In the S1 process of the following examples and comparative examples, mixing is carried out according to the formula requirements.

[0080] Example 3

[0081] The preparation raw material formula of this example is different from that of Example 1, and the other steps and parameters are the same as those of Example 1.

[0082] By mass, the preparation raw materials of this example include 45 parts of polyester resin, 12 parts of liquid rubber, 20 parts of thermosetting acrylic resin, 10 parts of melamine resin, 15 parts of blocked isocyanate, 1.5 parts of leveling agent, 1 part of dispersant, 1 part of defoaming agent, 1 part of dryer and 40 parts of organic solvent.

[0083] Example 4

[0084] The preparation raw material formula of this example is different from that of Example 1, and the other steps and parameters are the same as those of Example 1.

[0085] By mass, the preparation raw materials of this example include 40 parts of polyester resin, 7 parts of liquid rubber, 5 parts of thermosetting acrylic resin, 8 parts of melamine resin, 7 parts of blocked isocyanate, 1 part of leveling agent, 0.7 part of dispersant, 0.7 part of defoaming agent, 0.7 part of dryer and 30 parts of organic solvent.

[0086] Example 5

[0087] The preparation raw material formula of this example is different from that of Example 1, and the other steps and parameters are the same as those of Example 1.

[0088] By mass, the preparation raw materials of this example include 50 parts of polyester resin, 12 parts of liquid rubber, 15 parts of thermosetting acrylic resin, 15 parts of melamine resin, 15 parts of blocked isocyanate, 1.5 parts of leveling agent, 1 part of dispersant, 1 part of defoaming agent, 1 part of dryer and 30 parts of organic solvent.

[0089] Example 6

[0090] The preparation raw material formula of this example is different from that of Example 1, and the other steps and parameters are the same as those of Example 1.

[0091] By mass parts, the preparation raw materials of this embodiment include 65 parts of polyester resin, 2 parts of liquid rubber, 20 parts of melamine resin, 0.5 part of leveling agent, 0.5 part of dispersant, 0.2 part of defoaming agent, 0.2 part of drying agent, and 35 parts of organic solvent.

[0092] Example 7

[0093] The preparation raw materials of this embodiment are different from those of Example 1, and other steps and parameters are the same as those of Example 1.

[0094] By mass parts, the preparation raw materials of this embodiment include 40 parts of polyester resin, 12 parts of liquid rubber, 5 parts of thermosetting acrylic resin, 8 parts of melamine resin, 15 parts of blocked isocyanate, 1 part of leveling agent, 1 part of dispersant, 1 part of defoaming agent, 1 part of drying agent, and 30 parts of organic solvent.

[0095] Example 8

[0096] The preparation raw material formula of this embodiment is different from that of Example 1, and other steps and parameters are the same as those of Example 1.

[0097] By mass parts, the preparation raw materials of this embodiment include 50 parts of polyester resin, 2 parts of liquid rubber, 15 parts of thermosetting acrylic resin, 15 parts of melamine resin, 7 parts of blocked isocyanate, 0.7 part of leveling agent, 0.7 part of dispersant, 0.7 part of defoaming agent, 0.7 part of drying agent, and 40 parts of organic solvent.

[0098] Example 9

[0099] The preparation raw material formula of this embodiment is different from that of Example 1, and other steps and parameters are the same as those of Example 1.

[0100] By mass parts, the preparation raw materials of this embodiment include 65 parts of polyester resin, 7 parts of liquid rubber, 20 parts of melamine resin, 1.5 parts of leveling agent, 0.5 part of dispersant, 0.2 part of defoaming agent, 0.2 part of drying agent, and 35 parts of organic solvent.

[0101] Example 10

[0102] The preparation raw material formula of this embodiment is different from that of Example 1, and other steps and parameters are the same as those of Example 1.

[0103] By mass parts, the preparation raw materials of this embodiment include 45 parts of polyester resin, 8 parts of liquid rubber, 10.5 parts of melamine resin, 0.6 part of leveling agent, 1 part of dispersant, 0.5 part of defoaming agent, 0.4 part of drying agent, and 34 parts of organic solvent.

[0104] Comparative Example 1

[0105] This comparative example has a different formulation of preparation raw materials from that of Example 1. This comparative example does not contain liquid rubber and thermosetting acrylic resin; other steps and parameters are the same as those in Example 1.

[0106] By mass, the preparation raw materials of this comparative example include 60 parts of polyester resin, 12.5 parts of blocked isocyanate, 0.8 part of leveling agent, 0.8 part of dispersant, 0.8 part of defoaming agent, 0.4 part of dryer, and 35 parts of organic solvent.

[0107] Compared with Example 1, in Comparative Example 1, liquid rubber and thermosetting acrylic resin are not added. Therefore, the solubility after mixing with polyester in the coating is poor, the coating film becomes brittle, some properties cannot reach the best state, the conventional physical properties become poor, and properties such as salt spray resistance, abrasion resistance, and chemical resistance are reduced.

[0108] Comparative Example 2

[0109] This comparative example has a different formulation of preparation raw materials from that of Example 1. This comparative example does not contain liquid rubber and blocked isocyanate; other steps and parameters are the same as those in Example 1.

[0110] By mass, the formulation of the preparation raw materials of this comparative example includes 50 parts of polyester resin, 25 parts of thermosetting acrylic resin, 12.5 parts of melamine resin, 0.8 part of leveling agent, 0.8 part of dispersant, 0.5 part of defoaming agent, 0.4 part of dryer, and 34 parts of organic solvent.

[0111] Test Example 1

[0112] Test the samples of the above Examples 1 to 10 and Comparative Examples 1 to 2 according to the standards or methods in Table 2.

[0113] The impact strength test means that after the heavy hammer falls freely, the paint film does not crack under a gravity of 50 kg per square centimeter of the surface.

[0114] The method for testing the resistance to coolant is to place the samples prepared in each example and comparative example in the coolant and heat it to 75 °C for 120 h; after the test for resistance to coolant is completed, observe the appearance of the samples to see if they peel off, change color, or are damaged to expose the substrate.

[0115] The method for testing the resistance to transformer oil is to place the samples prepared in each example and comparative example in the coolant and heat it to 125 °C for 120 h; after the test for transformer oil is completed, observe the appearance of the samples to see if they peel off, change color, or are damaged to expose the aluminum alloy plate.

[0116] The test results are shown in Table 3 and Table 4.

[0117] 。

[0118] 。

[0119] 。

[0120] Figure 1 Appearance comparison between Example 1 (A) and Comparative Example 1 (B) after 8000 scrub resistance tests. The test results show that after 8000 scrubbings of the nano - coating in Example 1, slight wear and scratches appeared on the surface of the sample, but the coating did not break through to expose the underlying aluminum alloy plate. In addition, the hydrophobic property, water droplet angle, and scratch resistance of Example 1 changed only slightly compared with those before the test, and the coating structure remained intact without damage.

[0121] In contrast, the nano - coating of Comparative Example 1 showed obvious peeling and scratches under the same conditions, and the loss of gloss rate increased significantly after the scrub resistance test.

[0122] Examples 10 - 12 explored the salt spray resistance test results of samples using different series of aluminum alloy materials. For the convenience of testing, aluminum alloy plates were used instead of radiators for the experiment.

[0123] Example 11

[0124] The aluminum alloy plate material of this example is 5038 aluminum alloy, and other steps and parameters are the same as those in Example 10.

[0125] Example 12

[0126] The aluminum alloy plate material of this example is 6082 aluminum alloy, and other steps and parameters are the same as those in Example 10.

[0127] Test Example 2

[0128] According to the GB / T 6458 standard, neutral salt spray tests were carried out on the samples of Examples 11 and 12.

[0129] The appearances of the samples of Example 11 after 3380h and 3480h of neutral salt spray tests are shown in Figure 2 。After the cross - hatch neutral salt spray test at 3380h, neither the gloss nor the hardness of the sample changed. However, after 3480h, the appearance of the sample showed loss of gloss, and the coating became soft.

[0130] The appearances of the samples of Example 12 after 3380h and 3480h of neutral salt spray tests are shown in Figure 3 。Similar to Example 1, the gloss and hardness of the sample remained unchanged after 3380h, but after 3480h, the sample also showed loss of gloss and softening of the coating.

[0131] The nano - coating of the radiator involved in the present invention shows good adhesion performance to 1 - series, 5 - series and 6 - series aluminum alloys, indicating its suitability for various types of aluminum alloy materials, especially 5038 and 6082 aluminum alloys.

[0132] The present invention relates to a nano - coating applied to a radiator, which is designed to replace traditional chromating and electrophoretic treatment methods. Compared with traditional treatments, this nano - coating provides excellent long - term easy - to - clean performance, while achieving a high - strength anti - corrosion effect, and can maintain corrosion resistance for 3000 to 4000 hours in a salt - fog environment. In addition, this nano - coating also has high anti - wear and anti - scratch capabilities, enhancing the texture effect of the metal, enabling the metal surface to remain clean and bright for a long time. Finally, it endows the coating film with a high - strength anti - corrosion function (salt - fog resistance of 3000 - 4000h), and also brings high anti - wear, anti - scratch, chemical resistance, good mechanical properties and excellent appearance.

[0133] Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present invention can be obtained through market purchase or can be prepared by existing methods. The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above - mentioned are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A nano coating for a radiator, characterized in that: The preparation material is composed of the following parts by weight: 40-65 parts of polyester resin, 2-8 parts of liquid rubber, 0-5 parts of thermosetting acrylic resin, 8-20 parts of melamine resin, 0-7 parts of blocked isocyanate, 0.5-2 parts of leveling agent, 0.5-1.2 parts of dispersant, 0.2-1.5 parts of defoamer, 0.2-1.5 parts of drying agent and 25-45 parts of organic solvent; The polyester resin is a polar polyester resin containing hydrogen bonds; the hydroxyl content of the polyester resin is 15-25 mgKOH / g; The liquid rubber is a hydroxy-terminated nitrile liquid rubber; The leveling agent is polydimethylsiloxane containing epoxy functional groups; The organic solvent is a mixed solvent of petroleum ether, propylene glycol methyl ether acetate and n-butanol.

2. The nano coating for radiator according to claim 1, characterized in that: Meet at least one of the following conditions ①~③: ① The melamine resin is hexamethoxymethyl melamine resin; ② The blocked isocyanate is a blocked alicyclic polyisocyanate; ③The dispersant is silicone-modified polydimethylsiloxane.

3. The nano coating for radiator according to claim 2, characterized in that: Satisfy at least one of the following conditions ①~⑧: ① The solid content of the polyester resin is ≥ 60%; ② The viscosity of the polyester resin at 25° C. is 13000-17000 mPa·s; ③ The Mw of the polyester resin is ≥ 2000; ④The solid content of the liquid rubber is ≥98%; ⑤ The hydroxyl content of the liquid rubber is 31-42 mgKOH / g; ⑥ The viscosity of the liquid rubber at 40°C is ≤30mPa·s; ⑦ The solid content of the melamine resin is ≥98%; ⑧ The viscosity of the melamine resin at 23° C. is 3000-6200 mPa·s.

4. The method for preparing a nano coating for a radiator according to any one of claims 1 to 3, characterized in that: The following steps are involved: The prepared raw materials are mixed to obtain a nano coating for a radiator.

5. The method for preparing the nano coating for radiator according to claim 4, characterized in that: Meet at least one of the following conditions ①~②: ① The mixing comprises the following steps: S1. Add a dispersant, a polyester resin, a liquid rubber, a melamine resin, a thermosetting acrylic resin, a blocked isocyanate, and a leveling agent to an organic solvent and stir to obtain a first solution; S2. Add an organic solvent to the first solution and mix well, then let stand to obtain a second solution; S3. After adding a defoamer and a drying agent to the second solution and stirring, a nano-coating for a radiator is obtained; ② After mixing, pass through a 120-200 mesh sieve.

6. A nano coating for a radiator, characterized in that: The raw materials for preparing the nano coating include the nano coating for radiator as described in any one of claims 1 to 3.

7. The nano coating for heat sink according to claim 6, characterized in that: The thickness of the nano coating for the heat sink is 9-15 μm.

8. The method for preparing a nano coating for a radiator according to any one of claims 6 to 7, characterized in that: The following steps are involved: The nano coating for the radiator is obtained by coating the coating on the surface of the radiator.

9. The method for preparing a nano coating for a heat sink according to claim 8, characterized in that: Meet at least one of the following conditions ①~②: ① The coating method is dipping, spraying or showering; ② After the coating, a curing step is also included.

10. The method for preparing a nano coating for a heat sink according to claim 9, characterized in that: Meet at least one of the following conditions ①~⑤: ① The caliber of the spray gun used for spraying is 0.8~1.0mm; ② The distance between the spray nozzle and the radiator surface is 15-18 mm; ③ The spraying speed is 10~12m / min; ④ The curing temperature is 160~175°C; ⑤The curing time is 30 to 40 minutes.

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