Self-cleaning high-weather-resistance high-radiation refrigeration coating and preparation method thereof

Abstract

The invention relates to a self-cleaning high-weather-resistance high-radiation refrigeration coating and a preparation method thereof. The self-cleaning high-weather-resistance high-radiation refrigeration coating is prepared from the following components: self-cleaning fluorocarbon emulsion, hydroxyethyl cellulose, electroless refrigeration powder, modified rare earth oxide, opacifying polymer emulsion, auxiliaries and water. Wherein the self-cleaning fluorocarbon emulsion is a self-cleaning fluorocarbon emulsion with a core-shell structure; in the core-shell structure, the core structure is obtained by polymerizing an acrylate monomer; the shell structure is obtained by reacting a fluorine-containing acrylate monomer, a silane coupling agent and an acrylate monomer. Compared with the prior art, the fluorocarbon chain segments in the various components can be physically wound to play a synergistic role, so that the strength of the net structure of the film layer is further improved, and the coating film is endowed with excellent weather resistance, stain resistance and longer service life.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a self-cleaning high-weather-resistant and high-radiation refrigeration coating and a preparation method thereof. Background Art

[0002] With the acceleration of industrialization and urbanization, global greenhouse gas emissions have surged, causing global warming. Extreme climate events such as heat waves, droughts, and floods have occurred frequently, seriously threatening human society and natural ecosystems. At the same time, global energy consumption has continued to rise, especially the widespread use of fossil energy, which has not only triggered an energy crisis, but also exacerbated environmental damage and climate anomalies.

[0003] Faced with this challenge, the development of energy-saving green building materials has become an effective strategy for the construction industry to cope with climate change, resource shortages and health needs. Energy-saving green coatings are designed to improve building energy efficiency and reduce environmental impact, save resources and energy throughout the life cycle, and improve living comfort. With the increasingly severe climate and energy problems, the application of energy-saving green coatings in new buildings and renovation of existing buildings has received more and more attention, and has become an important means to achieve green transformation in the construction industry. However, the existing new energy-saving green coatings-radiant cooling coatings have the following three problems: first, the solar reflectance of the coating is low, and the radiation cooling performance is poor; second, the weather resistance of the coating is poor, which greatly shortens the service life of the coating, affecting its large-scale promotion and use; third, the self-cleaning property of the coating is poor, and the stain resistance is poor. After pollution, the reflectance of sunlight and near-infrared is greatly reduced, affecting its radiation insulation performance.

[0004] Therefore, there is an urgent need to develop a self-cleaning, highly weather-resistant radiant cooling coating to meet the practical needs of modern green buildings. Summary of the invention

[0005] Based on this, the present invention has developed a self-cleaning high-weather-resistant high-radiation refrigeration coating and its preparation method. The coating not only solves the problem of poor radiation cooling performance of existing products, but also improves the solar reflectance of the coating film from the existing 86% to 95%, and also solves the problem of poor weather resistance and stain resistance of the product, thereby improving the service life of the paint film. It is also particularly emphasized that the self-cleaning high-weather-resistant radiation refrigeration coating provided by the technology of the present invention has excellent weather resistance and stain resistance, which can give the coating film a long service life and bring all-round decoration and protection to the facade of the building.

[0006] One object of the present invention is to provide a self-cleaning high weather resistance and high radiation refrigeration coating, wherein the self-cleaning high weather resistance and high radiation refrigeration coating comprises the following components in parts by mass:

[0007]

[0008]

[0009] Wherein, the self-cleaning fluorocarbon emulsion is a self-cleaning fluorocarbon emulsion with a core-shell structure;

[0010] In the core-shell structure, the core structure is obtained by polymerization of acrylic acid ester monomers;

[0011] The shell structure is obtained by the reaction of a fluorinated acrylate monomer, a silane coupling agent and an acrylate monomer;

[0012] The modified rare earth oxide is a rare earth oxide modified by dodecafluoroheptyl methacrylate.

[0013] Furthermore, the acrylic acid ester monomer is selected from one or more of n-butyl acrylate, hydroxypropyl methacrylate, butyl acrylate, methyl methacrylate, and hydroxypropyl acrylate.

[0014] The present invention adopts non-electric refrigeration powder and rare earth oxide as thermal insulation fillers. The non-electric refrigeration powder is a special non-electric refrigeration composite pigment composed of nano inorganic materials with high band gap and high refractive index. It replaces the traditional rutile titanium dioxide with low band gap and strong absorption of ultraviolet rays in sunlight, and realizes that it can have extremely high reflectivity for full-band solar radiation including ultraviolet rays, visible light and near infrared, and can emit the absorbed solar radiation energy into the cold outer space to achieve an all-weather refrigeration effect. At the same time, with modified rare earth oxide, it not only has a good coverage rate, but also has excellent thermal insulation performance. It converts light energy into heat energy through the change of the active valence of rare earth oxide, and then radiates the heat energy to achieve a good thermal insulation effect. It is different from the thermal insulation principle of traditional thermal insulation titanium dioxide. The two work together to further give the coating film an excellent refrigeration effect.

[0015] Specifically, the covering polymer emulsion is selected from one or more of Dow Ultron E, Rosff HE-380, and Wanhua H400.

[0016] In particular, the hiding polymer emulsion has a polymer with a hollow structure, which can improve the hiding power, heat insulation and rheological properties of the paint film.

[0017] The present invention selects hiding polymer emulsion as auxiliary filler, which can give the coating film good hiding power and further give the coating film good heat insulation performance and improve the rheology of the coating due to its hollow structure, giving the coating better construction performance and cooling effect.

[0018] Furthermore, the auxiliary agent is selected from one or more of a dispersant, a wetting agent, a defoaming agent, a pH regulator, a film-forming aid, an antifreeze agent, a thickener, a leveling agent, and a preservative and bactericidal agent.

[0019] Specifically, the rare earth oxide is selected from one or more of lanthanum oxide, cerium oxide, and samarium oxide.

[0020] In particular, the viscosity of the hydroxyethyl cellulose is 150-500 CPS, which can give the product good fluidity and leveling properties, as well as good anti-sagging and storage properties.

[0021] In particular, the dispersant has super strong dispersing ability and excellent stability, and can also improve the water resistance of the product.

[0022] In particular, the wetting agent is selected from one or more of alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether sulfate or polyoxyethylene alkylphenol ether.

[0023] In particular, the pH adjuster is selected from one of an organic amine aqueous solution, an organic silicon aqueous solution or a hydroxide aqueous solution.

[0024] In particular, the non-electric cooling powder has extremely high reflectivity to ultraviolet light, visible light and near infrared, and also has high hiding power and high atmospheric window emissivity, thereby giving the paint film excellent radiation cooling properties.

[0025] In particular, the rare earth oxide has good hiding power and heat insulation properties, and can especially absorb ultraviolet light, visible light and infrared light and convert light energy into heat energy through changes in the active valence of the rare earth oxide, and then achieve a good heat insulation effect by radiating the heat energy.

[0026] In particular, the thickener is selected from polyurethane thickeners, which have excellent compatibility, thickening and leveling properties, and water and alkali resistance.

[0027] In particular, the leveling agent is selected from one of a silicone leveling agent or an acrylic leveling agent.

[0028] In particular, the preservative and fungicide is selected from one of benzisothiazolinone or methylisothiazolinone.

[0029] Another object of the present invention is to provide a method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating, comprising the following steps:

[0030] S1. mixing several kinds of acrylate monomers to obtain a core prepolymer mixture;

[0031] S2. The fluorinated acrylate monomer, the silane coupling agent and the acrylate monomer are uniformly mixed to obtain a shell prepolymer mixture;

[0032] S3. The core prepolymer mixture is added to a solvent, an initiator and an emulsifier are added, and the reaction is heated to obtain a seed emulsion;

[0033] S4. The shell prepolymer mixture and the initiator are added to the seed emulsion, heated to react, and a self-cleaning fluorocarbon emulsion is obtained;

[0034] S5. reacting the rare earth oxide with a silane coupling agent, adding dodecafluoroheptyl methacrylate and an initiator, and heating the reaction to obtain a modified rare earth oxide;

[0035] S6. Blending the self-cleaning fluorocarbon emulsion, modified rare earth oxide and other ingredients to obtain a self-cleaning high weather resistance and high radiation refrigeration coating.

[0036] Specifically, the self-cleaning fluorocarbon emulsion imparts a good hydrophobic self-cleaning effect to the coating film, which can significantly improve the stain resistance of the coating film, thereby effectively solving the problem of poor weather resistance and stain resistance of existing products.

[0037] Furthermore, in step S3, the heating temperature is 80-95°C.

[0038] Furthermore, in step S4, the heating temperature is 75-85°C.

[0039] Furthermore, in step S5, the heating temperature is 80-85°C.

[0040] Furthermore, the emulsifier is a mixture of sodium lauryl sulfate and alkylphenol polyoxyethylene ether.

[0041] Furthermore, the initiator is selected from potassium persulfate.

[0042] Specifically, the mass ratio of sodium dodecyl sulfate (SDS) to alkylphenol polyoxyethylene ether (OP-10) is 1-2:2-3.

[0043] Furthermore, the initiator is selected from one or more of potassium persulfate and ammonium persulfate.

[0044] The present invention has the following beneficial effects:

[0045] The invention adopts a self-cleaning fluorocarbon emulsion with a core-shell structure and rare earth oxide modified by dodecafluoroheptyl methacrylate as components of the coating; firstly, the rare earth oxide is modified by a silane coupling agent, and then a polymerization reaction is carried out with dodecafluoroheptyl methacrylate under the action of an initiator, so that a fluorine-containing acrylate segment is introduced into the modified rare earth oxide, thereby improving the compatibility of the modified rare earth oxide with components such as the fluorocarbon emulsion, which is beneficial to reducing the surface energy and improving the isolation effect of external light and heat; secondly, a product of polymerization of multiple acrylate monomers is used as a core structure, and then Later, the product of the reaction of fluorinated acrylate monomer, silane coupling agent and acrylate monomer was used as the shell structure to obtain a self-cleaning fluorocarbon emulsion with a core-shell structure. Fluorinated groups, silane groups and acrylic acid segments were introduced into the shell structure, which not only improved the compatibility between the components and was conducive to improving the stability, but also improved the hydrophobicity and self-cleaning performance of the coating; moreover, the fluorocarbon segments in the various components can be physically entangled and play a synergistic role, further improving the strength of the membrane network structure, giving the coating excellent weather resistance, stain resistance, and a longer service life. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment methods shown in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0047] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0048] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers expressing, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all instances by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0049] Hydroxyethyl cellulose, viscosity 150-500 CPS, Plus330 cellulose, purchased from Ashland Chemical Co., Ltd.

[0050] The non-electric refrigeration powder, SC100A, was purchased from Shanghai Xinshou Additives Co., Ltd.

[0051] Rare earth oxides, lanthanum oxide.

[0052] The covering polymer emulsion, HE-380, was purchased from Rosfor New Materials Technology Co., Ltd.

[0053] Dispersant, 731A, was purchased from Dow Chemical.

[0054] The wetting agent, CA90, was purchased from Dow Chemical.

[0055] Mineral oil defoamer, NXZ, was purchased from Nopco Additives Co., Ltd., Japan.

[0056] pH adjuster, AR-95, was purchased from Shanghai Aorun Chemical Co., Ltd.

[0057] The film-forming aid, TEXANOL alcohol ester XII, was purchased from Eastman Chemical.

[0058] Antifreeze, ethylene glycol, was purchased from Guangdong Weida Chemical Co., Ltd.

[0059] Thickener, polyurethane thickener, 817W, purchased from French Gaotai Water-based Additives Company.

[0060] Silicone defoamer, SN157, was purchased from Nopco Additives Co., Ltd., Japan.

[0061] Leveling agent, NHS 300E, was purchased from Ashland Chemical Co., Ltd.

[0062] The preservative and fungicide, MBS5050, was purchased from Thor Specialty Chemicals Co., Ltd.

[0063] Initiator, potassium persulfate.

[0064] Emulsifier: a mixture of sodium dodecyl sulfate (SDS) and alkylphenol polyoxyethylene ether (OP-10) in a mass ratio of 1:2.

[0065] Silane coupling agent aqueous solution, 10% by mass of KH570 aqueous solution.

[0066] Example 1

[0067] A self-cleaning high weather resistance and high radiation refrigeration coating, the self-cleaning high weather resistance and high radiation refrigeration coating comprising the following components in parts by mass:

[0068]

[0069]

[0070] The preparation method of the self-cleaning high weather resistance and high radiation refrigeration coating is as follows:

[0071] S1. 53.4 g of n-butyl acrylate, 30.2 g of methyl methacrylate and 21.072 g of hydroxypropyl methacrylate were mixed to obtain a core prepolymer mixture;

[0072] S2. 4.53 g of dodecafluoroheptyl methacrylate, 40 ml of a 25 wt % aqueous solution of a silane coupling agent, 26.72 g of butyl acrylate, 15.104 g of methyl methacrylate and 10.536 g of hydroxypropyl acrylate were mixed to obtain a shell prepolymer mixture;

[0073] S3. The core prepolymer mixture was added to 400 g of deionized water, 40 mL of 0.006 g / mL initiator solution (potassium persulfate aqueous solution) was added, the temperature was raised to 50 ° C after the addition was completed, 4.8 g of emulsifier was added, and after the emulsifier was completely dissolved, the temperature was raised to 80 ° C for 2 h to obtain a seed emulsion;

[0074] S4. The shell prepolymer mixture and 160 mL of 0.006 g / mL potassium persulfate aqueous solution were slowly added dropwise to the seed emulsion (addition completed within 1 h), reacted at 80 ° C for 2 h, cooled, and the pH value of the emulsion was adjusted to 7 with potassium hydroxide aqueous solution to obtain a self-cleaning fluorocarbon emulsion;

[0075] S5-1. The rare earth oxide was mixed with an aqueous solution of a silane coupling agent, heated to 35 ° C, reacted for 30 min, then heated to 50 ° C, reacted for 3 h, and dried to obtain a pretreated rare earth oxide;

[0076] Wherein, the amount of the silane coupling agent is 1wt% of the mass of the rare earth oxide;

[0077] S5-2. Under the protection of nitrogen, 10 g of pretreated rare earth oxide was dispersed in 150 ml of deionized water, 8 g of dodecafluoroheptyl methacrylate and 0.5 g of potassium persulfate were added, and the reaction was heated at 80 ° C for 3 h, filtered, washed, and dried to obtain a modified rare earth oxide;

[0078] S6. According to the above mass fractions, the self-cleaning fluorocarbon emulsion, modified rare earth oxide and other ingredients are mixed to obtain a self-cleaning high weather resistance and high radiation refrigeration coating.

[0079] Example 2

[0080] A self-cleaning high weather resistance and high radiation refrigeration coating, the self-cleaning high weather resistance and high radiation refrigeration coating comprising the following components in parts by mass:

[0081]

[0082]

[0083] The preparation method of the self-cleaning high weather resistance and high radiation refrigeration coating is as follows:

[0084] S1. 53.4 g of n-butyl acrylate, 30.2 g of methyl methacrylate and 21.072 g of hydroxypropyl methacrylate were mixed to obtain a core prepolymer mixture;

[0085] S2. 4.53 g of dodecafluoroheptyl methacrylate, 40 ml of a 25 wt % aqueous solution of a silane coupling agent, 26.72 g of butyl acrylate, 15.104 g of methyl methacrylate and 10.536 g of hydroxypropyl acrylate were mixed to obtain a shell prepolymer mixture;

[0086] S3. The core prepolymer mixture was added to 400 g of deionized water, 40 mL of 0.006 g / mL initiator solution (potassium persulfate aqueous solution) was added, the temperature was raised to 50 ° C after the addition was completed, 4.8 g of emulsifier was added, and after the emulsifier was completely dissolved, the temperature was raised to 80 ° C for 2 h to obtain a seed emulsion;

[0087] S4. The shell prepolymer mixture and 160 mL of 0.006 g / mL potassium persulfate aqueous solution were slowly added dropwise to the seed emulsion (addition completed within 1 h), reacted at 80 ° C for 2 h, cooled, and the pH value of the emulsion was adjusted to 7 with potassium hydroxide aqueous solution to obtain a self-cleaning fluorocarbon emulsion;

[0088] S5-1. The rare earth oxide was mixed with an aqueous solution of a silane coupling agent, heated to 35 ° C, reacted for 30 min, then heated to 50 ° C, reacted for 3 h, and dried to obtain a pretreated rare earth oxide;

[0089] Wherein, the amount of the silane coupling agent is 1wt% of the mass of the rare earth oxide;

[0090] S5-2. Under the protection of nitrogen, 10 g of pretreated rare earth oxide was dispersed in 150 ml of deionized water, 8 g of dodecafluoroheptyl methacrylate and 0.5 g of potassium persulfate were added, and the reaction was heated at 80 ° C for 3 h, filtered, washed, and dried to obtain a modified rare earth oxide;

[0091] S6. According to the above mass fractions, the self-cleaning fluorocarbon emulsion, modified rare earth oxide and other ingredients are mixed to obtain a self-cleaning high weather resistance and high radiation refrigeration coating.

[0092] Example 3

[0093] A self-cleaning high weather resistance and high radiation refrigeration coating, the self-cleaning high weather resistance and high radiation refrigeration coating comprising the following components in parts by mass:

[0094]

[0095] The preparation method of the self-cleaning high weather resistance and high radiation refrigeration coating is as follows:

[0096] S1. 53.4 g of n-butyl acrylate, 30.2 g of methyl methacrylate and 21.072 g of hydroxypropyl methacrylate were mixed to obtain a core prepolymer mixture;

[0097] S2. 4.53 g of dodecafluoroheptyl methacrylate, 40 ml of a 25 wt % aqueous solution of a silane coupling agent, 26.72 g of butyl acrylate, 15.104 g of methyl methacrylate and 10.536 g of hydroxypropyl acrylate were mixed to obtain a shell prepolymer mixture;

[0098] S3. The core prepolymer mixture was added to 400 g of deionized water, 40 mL of 0.006 g / mL initiator solution (potassium persulfate aqueous solution) was added, the temperature was raised to 50 ° C after the addition was completed, 4.8 g of emulsifier was added, and after the emulsifier was completely dissolved, the temperature was raised to 80 ° C for 2 h to obtain a seed emulsion;

[0099] S4. The shell prepolymer mixture and 160 mL of 0.006 g / mL potassium persulfate aqueous solution were slowly added dropwise to the seed emulsion (addition completed within 1 h), reacted at 80 ° C for 2 h, cooled, and the pH value of the emulsion was adjusted to 7 with potassium hydroxide aqueous solution to obtain a self-cleaning fluorocarbon emulsion;

[0100] S5-1. The rare earth oxide was mixed with an aqueous solution of a silane coupling agent, heated to 35 ° C, reacted for 30 min, then heated to 50 ° C, reacted for 3 h, and dried to obtain a pretreated rare earth oxide;

[0101] Wherein, the amount of the silane coupling agent is 1wt% of the mass of the rare earth oxide;

[0102] S5-2. Under the protection of nitrogen, 10 g of pretreated rare earth oxide was dispersed in 150 ml of deionized water, 8 g of dodecafluoroheptyl methacrylate and 0.5 g of potassium persulfate were added, and the reaction was heated at 80 ° C for 3 h, filtered, washed, and dried to obtain a modified rare earth oxide;

[0103] S6. According to the above mass fractions, the self-cleaning fluorocarbon emulsion, modified rare earth oxide and other ingredients are mixed to obtain a self-cleaning high weather resistance and high radiation refrigeration coating.

[0104] Comparative Example 1

[0105] The difference between this comparative example and Example 3 is that the self-cleaning fluorocarbon emulsion is replaced with a fluorocarbon emulsion commonly used on the market (purchased from Shanghai Baolijia Chemical Co., Ltd., brand SX-988), and the other ingredients and preparation methods are the same.

[0106] Comparative Example 2

[0107] The difference between this comparative example and Example 3 is that step S5 is removed, that is, the modified rare earth oxide is replaced by an equal mass of rare earth oxide, and the other components and preparation methods are the same.

[0108] Test Example 1

[0109] The performance of the self-cleaning, high-weather-resistant, high-radiation refrigeration coatings prepared in Examples 1-3 and Comparative Examples 1-2 was tested.

[0110] Test method:

[0111] Stain resistance: The test was carried out in two cycles in accordance with the provisions of Chapter 5 of GB / T 9780-2013, Test method for stain resistance of exterior wall paint coatings, brush coating method B (fast oven).

[0112] Resistance to artificial weathering: tested in accordance with GB / T 9755-2014 standard.

[0113] Solar reflectance, hemispherical emissivity, and rate of change of solar reflectance after pollution: Tests shall be conducted in accordance with the standards in JG / T235-2014.

[0114] Surface temperature test of non-asbestos fiber cement board: The coatings of Example 1 and Comparative Examples 1-2 were respectively applied at 0.30 kg / m 2 The amount of the coating was applied on a 300*300mm non-asbestos fiber cement board, and then the board was exposed to the sun for 2 hours on the rooftop at an atmospheric temperature of 36°C in summer, and the surface temperature of each non-asbestos fiber cement board was tested.

[0115] The test results are shown in Table 1.

[0116] Table 1 Performance test results of coatings of Examples 1-3 and Comparative Examples 1-2

[0117]

[0118]

[0119] The following experimental conclusions can be drawn from the comparative analysis of the experimental results of the above Examples 1-3 and Comparative Examples 1-2:

[0120] Compared with the prior art products, the coatings of Examples 1-3 of the present invention have higher solar reflectance and hemispherical emissivity, and the solar reflectance (TSR) can reach more than 95%; and have a lower surface temperature, which can be lower than the atmospheric temperature, and the effectively absorbed solar radiation can be emitted into the cold outer space, achieving an all-weather cooling effect; secondly, from the data of stain resistance and the change rate of solar reflectance after pollution, it can be seen that the self-cleaning effect of the product is obvious; in addition, the resistance to artificial weathering is also far better than that of the prior art products, and the coating film has obvious advantages in weather resistance and stain resistance, the change rate of solar reflectance after pollution is significantly reduced, and the performance of solar reflectance and hemispherical emissivity is significantly improved. The results of the surface temperature of the asbestos-free fiber cement board in actual application also further show that the cooling effect of Examples 1-3 of the present invention is outstanding, and the surface temperature can be lower than the atmospheric temperature. The fluorocarbon emulsion and modified rare earth oxide of the core-shell structure of the present invention can significantly improve the stain resistance and weather resistance of the product, and can effectively reduce the surface temperature of the coating by working together with the thermal insulation filler.

[0121] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0122] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A self-cleaning, highly weather-resistant and highly radiant refrigeration coating, characterized in that: The self-cleaning high weather resistance and high radiation refrigeration coating comprises the following components in parts by mass: Wherein, the self-cleaning fluorocarbon emulsion is a self-cleaning fluorocarbon emulsion with a core-shell structure; In the core-shell structure, the core structure is obtained by polymerization of acrylic acid ester monomers; The shell structure is obtained by the reaction of a fluorinated acrylate monomer, a silane coupling agent and an acrylate monomer; The modified rare earth oxide is a rare earth oxide modified by dodecafluoroheptyl methacrylate.

2. The self-cleaning, highly weather-resistant and highly radiant refrigeration coating according to claim 1, characterized in that: The acrylic acid ester monomer is selected from one or more of n-butyl acrylate, hydroxypropyl methacrylate, butyl acrylate, methyl methacrylate, and hydroxypropyl acrylate.

3. The self-cleaning, highly weather-resistant and highly radiant refrigeration coating according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a dispersant, a wetting agent, a defoaming agent, a pH regulator, a film-forming aid, an antifreeze agent, a thickener, a leveling agent, and a preservative and bactericide.

4. The self-cleaning, highly weather-resistant and highly radiant refrigeration coating according to claim 1, characterized in that: The rare earth oxide is selected from one or more of lanthanum oxide, cerium oxide and samarium oxide.

5. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to any one of claims 1 to 4, characterized in that: The steps include: S1. mixing several kinds of acrylate monomers to obtain a core prepolymer mixture; S2. The fluorinated acrylate monomer, the silane coupling agent and the acrylate monomer are uniformly mixed to obtain a shell prepolymer mixture; S3. The core prepolymer mixture is added to a solvent, an initiator and an emulsifier are added, and the reaction is heated to obtain a seed emulsion; S4. The shell prepolymer mixture and the initiator are added to the seed emulsion, heated to react, to obtain a self-cleaning fluorocarbon emulsion; S5. reacting the rare earth oxide with a silane coupling agent, adding dodecafluoroheptyl methacrylate and an initiator, and heating the reaction to obtain a modified rare earth oxide; S6. Blending the self-cleaning fluorocarbon emulsion, modified rare earth oxide and other ingredients to obtain a self-cleaning high weather resistance and high radiation refrigeration coating.

6. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to claim 5, characterized in that: In step S3, the heating temperature is 80-95°C.

7. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to claim 5, characterized in that: In step S4, the heating temperature is 75-85°C.

8. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to claim 5, characterized in that: In step S5, the temperature of the heating reaction is 80-85°C.

9. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to claim 5, characterized in that: The emulsifier is a mixture of sodium lauryl sulfate and alkylphenol polyoxyethylene ether.

10. The method for preparing the self-cleaning high weather resistance and high radiation refrigeration coating according to claim 5, characterized in that: The initiator is selected from one or more of potassium persulfate and ammonium persulfate.

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