Outdoor paint with heat insulation effect and preparation method thereof

Abstract

The invention relates to the technical field of paint, in particular to outdoor paint with a heat insulation effect and a preparation method thereof, and the outdoor paint comprises the following components: a fluorine-containing epoxy acrylate resin matrix, fumed silica / perlite composite heat insulation filler, nano aluminum oxide, a silane coupling agent and self-repairing polyurethane; the performance of the outdoor paint is optimized from multiple dimensions of heat insulation, weather resistance, self-repairing and the like through dosage optimization and synergistic effect of all the components. The fluorine-containing epoxy acrylate resin matrix lays a high-performance foundation, the composite heat-insulating filler constructs an efficient heat-insulating network, the nano-alumina and the silane coupling agent optimize the interface and mechanical properties, and the self-repairing polyurethane endows the coating with the self-healing ability. Under the synergistic effect, the problems that traditional outdoor paint is poor in heat insulation, weak in weather resistance, prone to damage and failure and the like are solved, a long-term, stable and efficient protective and decorative coating is provided for an outdoor base material, the strict requirement for paint performance in the outdoor complex environment is met, and the application field is widened.

Description

Technical Field

[0001] This invention relates to the field of paint technology, specifically to an outdoor paint with heat insulation properties and its preparation method. Background Technology

[0002] Paint, as a common coating material, is widely used on the surfaces of various substrates, serving functions such as protection and decoration. Outdoor paint is mainly used for the surface coating of outdoor facilities, such as building exteriors, bridges, steel structures, and outdoor furniture, which need to withstand the complex environmental tests of long-term exposure to sunlight, wind and rain, and temperature changes.

[0003] However, existing outdoor paints have many shortcomings: In terms of heat insulation, ordinary outdoor paints have poor heat insulation effects. When exposed to direct sunlight in summer, heat can easily pass through the coating to the substrate, causing the substrate temperature to rise. This not only affects the performance of the substrate (e.g., accelerated aging of metal substrates due to thermal expansion and contraction, and increased air conditioning energy consumption due to increased indoor temperature); in terms of weather resistance, long-term outdoor exposure can easily lead to fading, chalking, and cracking. The coating structure is damaged by ultraviolet rays and moisture, reducing protective and decorative performance and shortening service life; some outdoor paints lack self-healing functions, and minor scratches on the coating can easily amplify the damage, causing corrosion of the substrate and affecting appearance and protective effect. At the same time, in terms of component synergy and compatibility with special functional fillers, it is difficult to meet the needs of high-performance, long-life coatings in complex outdoor environments.

[0004] Therefore, developing an outdoor paint that combines excellent heat insulation, weather resistance, and self-healing properties can significantly broaden the application areas of paints, especially outdoor paints. Summary of the Invention

[0005] The purpose of this invention is to provide an outdoor paint with heat insulation properties.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An outdoor paint with heat insulation effect comprises the following components by weight: 40-60 parts of fluorinated epoxy acrylate resin matrix, 20-30 parts of fumed silica / perlite composite heat insulation filler, 5-10 parts of nano alumina, 3-8 parts of silane coupling agent, and 10-15 parts of self-healing polyurethane. The fumed silica / perlite composite thermal insulation filler is a composite of fumed silica and expanded perlite that has undergone plasma surface treatment and epoxy resin microcapsule encapsulation. The silane coupling agent is specifically silane coupling agent 550.

[0007] As a further technical solution, the fluorinated epoxy acrylate resin matrix is ​​made by graft copolymerization of bisphenol A epoxy resin and acrylic monomer under the action of a free radical initiator, introducing fluorinated monomer for side chain modification, and then using a UV-LED segmented curing process.

[0008] As a further technical solution, the bisphenol A epoxy resin is E-44 epoxy resin, and the molar ratio with acrylic acid is 5-7:1; the free radical initiator is benzoyl peroxide, and the amount of initiator added is 1wt-1.5wt% of the mass of the bisphenol A epoxy resin; the reaction temperature is 70-90℃; and the reaction time is 3-5h; the fluorinated monomer is perfluorooctyl ethyl acrylate, and the amount added is 5wt-6wt% of the mass of the epoxy acrylate resin.

[0009] As a further technical solution, the UV-LED segmented curing process is as follows: first, irradiate with a wavelength of 365-405nm for 20-40s, and then irradiate with a wavelength of 260-300nm for 40-80s.

[0010] As a further technical solution, in the fumed silica / perlite composite thermal insulation filler, the mass ratio of fumed silica to expanded perlite is 1:2-4; the particle size of the fumed silica is 40-60nm, and the particle size of the expanded perlite is 40-120μm.

[0011] As a further technical solution, in the preparation of the fumed silica / perlite composite thermal insulation filler, the plasma surface treatment conditions are: power 250-350W, Ar atmosphere, treatment time 3-5min; the core material / wall material ratio of the epoxy resin microcapsule coating is 1:1.5-2.5, wherein the core material is a mixture of fumed silica and expanded perlite, and the wall material is epoxy resin.

[0012] As a further technical solution, the preparation method of the self-healing polyurethane is as follows: S1 raw material pretreatment: The amino-terminated polyether is dehydrated at 80-100℃ and vacuum degree of 0.08-0.1MPa for 1-2 hours, and the hexamethylene diisocyanate is dried. S2 prepolymerization reaction: The pretreated amino-terminated polyether and hexamethylene diisocyanate are added to the reactor at a molar ratio of 1:1.2-1.5. Under nitrogen protection, they are mixed at a stirring rate of 200-300 r / min and heated to 60-80℃ for 1-1.5 h. S3 chain extension reaction: Slowly add chain extender 1,4-butanediol to the reaction vessel. The amount of chain extender added is 3-5% of the total weight of the terminal amino polyether and hexamethylene diisocyanate. The addition time is controlled at 30-40 min. Continue to react at 60-80℃ for 2-2.5 h. S4 Post-treatment: After the reaction is complete, cool down to below 40℃, add 0.1-0.3% of the polymerization inhibitor hydroquinone by weight of the reaction product, stir evenly and discharge to obtain self-healing polyurethane.

[0013] A method for preparing an outdoor paint with heat insulation properties includes the following steps: (1) Preparation of fluorinated epoxy acrylate resin matrix; (2) Preparation of fumed silica / perlite composite thermal insulation filler; (3) Mixed components: Take the fluorinated epoxy acrylate resin matrix prepared in step (1), the composite heat insulation filler prepared in step (2), nano alumina, silane coupling agent and self-healing polyurethane according to the weight parts, and stir and mix them evenly. (4) The mixed materials are sprayed with high pressure airless to form a coating, and after curing, outdoor paint is obtained.

[0014] As a further technical solution, in step (4), the pressure of the high-pressure airless spraying is 30-40MPa, and the nozzle orifice diameter is 0.4-0.6mm.

[0015] As a further technical solution, in step (4), the thickness of the formed paint coating is 100-200μm; the curing is carried out by heat curing at 80℃ for 2-3h. Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the synergistic effect of its components, constructs an outdoor paint coating with excellent thermal insulation properties, greatly expanding the application fields of outdoor paints. The fluorinated epoxy acrylate resin matrix undergoes specific graft copolymerization, side chain modification, and UV-LED segmented curing. The introduction of fluorinated groups enhances the coating's weather resistance and hydrophobicity. UV-LED segmented curing optimizes the resin's cross-linking structure, endowing the matrix with good mechanical properties and chemical stability. The fumed silica / perlite composite thermal insulation filler, after plasma surface treatment, improves its compatibility with the resin. Epoxy resin microcapsule encapsulation enhances dispersibility and thermal insulation continuity. The nanoscale particle size of fumed silica and the porous structure of perlite synergistically block heat transfer, improving thermal insulation performance. Nano-alumina enhances the coating's hardness and wear resistance. Silane coupling agent 550 promotes the bonding between inorganic fillers and organic resins, improving interfacial compatibility. Self-healing polyurethane achieves scratch self-repair through molecular chain migration and reaction. The synergistic effect of the components significantly improves the heat insulation, weather resistance, and self-healing properties of outdoor paint, solving the problems of poor heat insulation, easy aging, and difficult repair of damage in traditional outdoor paint.

[0016] 2. In the fluorinated epoxy acrylate resin matrix, bisphenol A epoxy resin and acrylic acid graft copolymerization form the basic framework. Fluorinated monomer side chain modification introduces fluorinated groups, reducing surface energy and improving the coating's weather resistance and water resistance. UV-LED segmented curing initiates initial polymerization with long waves, followed by deep crosslinking with short waves, forming a dense and moderately flexible network structure that balances mechanical properties and weather resistance. Fumed silica / perlite composite thermal insulation filler undergoes plasma treatment to introduce active groups onto the filler surface, enhancing its bonding with the resin. Epoxy resin microcapsule encapsulation allows the filler to be uniformly dispersed in the coating, forming a continuous thermal insulation path. The nano-effect of fumed silica scatters heat, while the porous structure of expanded perlite blocks heat conduction; both synergistically enhance the thermal insulation effect. Self-healing polyurethane, through reactions with terminal amino polyethers and hexamethylene diisocyanate, constructs molecular chains containing reversible reaction sites. When damaged, these molecular chains migrate and react, achieving scratch healing. Synergistically with other components, it ensures the coating's integrity and long-term protective performance. The components complement each other and work synergistically, comprehensively improving the performance of outdoor paints from matrix structure and filler synergy to self-healing mechanisms.

[0017] 3. In summary, through optimized dosage and synergistic effects, the components of this invention optimize the performance of outdoor paints from multiple dimensions, including heat insulation, weather resistance, and self-healing. The fluorinated epoxy acrylate resin matrix lays the foundation for high performance, the composite heat-insulating filler constructs an efficient heat-insulating network, nano-alumina and silane coupling agents optimize interface and mechanical properties, and the self-healing polyurethane endows the coating with self-healing capabilities. Through synergistic effects, it solves the problems of poor heat insulation, weak weather resistance, and susceptibility to damage and failure in traditional outdoor paints, providing long-term, stable, and efficient protective and decorative coatings for outdoor substrates. This meets the stringent requirements of complex outdoor environments for paint performance, further expanding its application areas. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides an outdoor paint with heat insulation effect and its preparation method. The paint achieves excellent heat insulation performance, weather resistance and self-healing function through specific component matching and process optimization. It is suitable for the protection of outdoor metal, concrete and other substrates, which can greatly broaden the application range of outdoor paint and meet the application needs of multiple occasions.

[0020] This invention specifically includes: (I) Preparation of Fluorinated Epoxy Acrylic Resin Matrix Fluorinated epoxy acrylate resin matrix is ​​prepared by the following steps: Graft copolymerization: E-44 epoxy resin and acrylic monomer are mixed in a molar ratio of 5-7:1, and benzoyl peroxide is added in an amount of 1wt%-1.5wt% of the mass of E-44. The mixture is reacted at 70-90℃ for 3-5 hours to obtain epoxy acrylate resin. Side chain modification: Add perfluorooctyl ethyl acrylate to the above resin, the amount of which is 5wt%-6wt% of the resin mass, and stir until uniform; UV-LED segmented curing: First, irradiate with a wavelength of 365-405nm for 20-40s, then irradiate with a wavelength of 260-300nm for 40-80s to obtain a fluorinated epoxy acrylate resin matrix.

[0021] (II) Preparation of Fumed Silica / Perlite Composite Thermal Insulation Filler Composite thermal insulation filler is prepared through the following steps: Raw material pretreatment: Take fumed silica with a particle size of 40-60nm and expanded perlite with a particle size of 40-120μm, and mix them at a mass ratio of 1:2-4; Plasma surface treatment: Treat the mixture for 3-5 minutes under Ar atmosphere and power of 250-350W; Epoxy resin microcapsule encapsulation: using a mixture as the core material and epoxy resin as the wall material, encapsulation is carried out at a core material / wall material ratio of 1:1.5-2.5 to obtain a composite thermal insulation filler.

[0022] (III) Preparation of self-healing polyurethane Self-healing polyurethane is prepared through the following steps: Raw material pretreatment: The amino-terminated polyether is dehydrated at 80-100℃ and a vacuum of 0.08-0.1MPa for 1-2 hours; the hexamethylene diisocyanate is dried. Prepolymerization reaction: Add the terminal amino polyether to hexamethylene diisocyanate to the reactor at a molar ratio of 1:1.2-1.5, stir at 200-300 r / min under nitrogen protection, and heat to 60-80℃ for 1-1.5 h. Chain extension reaction: Add 1,4-butanediol dropwise (3-5% of the total weight of the first two steps), complete the addition in 30-40 minutes, and continue the reaction at 60-80℃ for 2-2.5 hours; Post-processing: Cool down to below 40℃, add 0.1-0.3% hydroquinone (by weight of the reaction product), stir evenly, and then discharge.

[0023] (iv) Preparation of outdoor paint The specific preparation steps of the outdoor paint with heat insulation effect and the preparation method thereof according to the present invention are as follows: Mixing components: Take 40-60 parts by weight of fluorinated epoxy acrylate resin matrix, 20-30 parts of composite thermal insulation filler, 5-10 parts of nano alumina, 3-8 parts of silane coupling agent 550, and 10-15 parts of self-healing polyurethane, and stir to mix evenly. Spray curing: High-pressure airless spraying is used to form a 100-200μm thick coating, which is then heat-cured at 80℃ for 2-3 hours to obtain outdoor paint; The parameters for high-pressure airless spraying are: pressure 30-40MPa, nozzle orifice diameter 0.4-0.6mm.

[0024] The following are specific examples. Example

[0025] Fluorinated epoxy acrylate resin matrix: E-44 to acrylic acid molar ratio 6:1, benzoyl peroxide addition 1.2wt%, reaction at 80℃ for 4h; perfluorooctyl ethyl acrylate addition 5.5wt%; UV-LED curing: 385nm irradiation for 30s, 280nm irradiation for 60s.

[0026] Composite thermal insulation filler: fumed silica (50nm) to expanded perlite (80μm) mass ratio 1:3; plasma treatment 300W, Ar atmosphere, 4min; core material / wall material ratio 1:2.

[0027] Self-healing polyurethane: amino-terminated polyether dehydrated at 90℃ and 0.09MPa for 1.5h; prepolymer molar ratio 1:1.3, reacted at 70℃ for 1.2h; chain extender added at 4%, added dropwise for 35min, reacted at 70℃ for 2.2h; hydroquinone added at 0.2%.

[0028] Paint formulation: 50 parts fluorinated epoxy acrylate, 25 parts composite heat insulation filler, 7 parts nano alumina, 5505 parts silane coupling agent, and 13 parts self-healing polyurethane.

[0029] Preparation process: after mixing, high pressure airless spraying (35MPa, nozzle 0.5mm), coating thickness 150μm, curing at 80℃ for 2.5h. Example

[0030] The difference from Example 1 is as follows: 40 parts of fluorinated epoxy acrylate resin matrix and 30 parts of composite thermal insulation filler; The mass ratio of fumed silica to expanded perlite in the composite thermal insulation filler is 1:2. UV-LED curing: 365nm irradiation for 20s, 260nm irradiation for 40s. Example

[0031] The difference from Example 1 is as follows: 60 parts of fluorinated epoxy acrylate resin matrix and 20 parts of composite thermal insulation filler; 10 parts of nano-alumina, 8 parts of silane coupling agent 550; UV-LED curing: 365nm irradiation for 30s, 260nm irradiation for 60s; High-pressure airless spraying pressure is 40MPa, and the coating thickness is 200μm. Example

[0032] The difference from Example 1 is as follows: UV-LED curing: 405nm irradiation for 30s, 300nm irradiation for 60s; In the preparation of self-healing polyurethane, the prepolymer molar ratio is 1:1.5, and the chain extender addition amount is 5%. Composite thermal insulation filler plasma treatment at 350W for 5 minutes; Curing time: 3 hours. Example

[0033] The difference from Example 1 is as follows: UV-LED curing: 405nm irradiation for 20s, 300nm irradiation for 50s; In the fluorinated epoxy acrylate, the molar ratio of E-44 to acrylic acid is 7:1, and the reaction temperature is 90℃. The expanded perlite in the composite thermal insulation filler has a particle size of 120μm; The nozzle diameter is 0.6 mm, and the coating thickness is 100 μm.

[0034] The following are specific comparative examples: Comparative Example 1 The difference from Example 1 is that it does not contain self-healing polyurethane, while the other components and processes remain unchanged.

[0035] Comparative Example 2 The difference from Example 1 is that the composite thermal insulation filler was not subjected to plasma surface treatment and epoxy resin coating (it directly used a mixture of fumed silica and expanded perlite), while the rest remained the same.

[0036] test Experiment 1: Thermal Insulation Performance Test Test methods Prepare 100mm×100mm×2mm steel plate samples and coat them with the paint of the examples and comparative examples (150μm thickness), while leaving the blank sample uncoated; The sample was placed in a 30℃ constant temperature chamber and irradiated with a 1000W infrared lamp (at a distance of 50cm) for 2 hours. The temperature on the back of the sample was recorded, and the temperature difference between the sample and the blank sample was calculated (the larger the temperature difference, the better the thermal insulation). The results are as follows: The temperature differences in Examples 1-5 were all between 21.5-23.2℃, demonstrating excellent thermal insulation performance. Comparative Example 2 had a temperature difference of only 11.2℃. Because the composite filler was not plasma-treated or coated, its surface compatibility was poor, resulting in uneven dispersion in the resin and causing the thermal insulation network to break, significantly reducing the thermal insulation effect. Comparative Example 1's thermal insulation performance was similar to that of the Examples, indicating that self-healing polyurethane has a relatively small impact on thermal insulation performance.

[0037] Test 2: Weather Resistance Test Test methods According to GB / T1865-2009, the coated sample was placed in an ultraviolet aging test chamber (UVB-313 lamp, irradiance 0.71W / m², 60℃, spraying for 18min / 102min cycle). After 500 hours of testing, the gloss retention rate at a 60° angle (higher is better) and the color difference ΔE (lower is better) were measured. The results are as follows: Examples 1-5 exhibit gloss retention of >85%, ΔE <1.5, and excellent weather resistance.

[0038] Comparative Example 1 had a low gloss retention rate (75%) and a large ΔE (2.8%). Due to the lack of self-healing polyurethane, it could not repair the microcracks caused by UV aging, and the crack propagation accelerated the degradation of the coating. Comparative Example 2 had the worst performance (gloss retention rate 62%, ΔE 3.5). The untreated composite filler was prone to interface oxidation caused by UV light, and the uneven dispersion led to stress concentration, making the coating prone to powdering.

[0039] Experiment 3: Self-healing performance test Test methods Make a 100μm deep scratch on the sample surface with a blade and place it in an environment of 50℃ and 60% humidity for 24 hours; Microscopic observation of scratch healing rate (higher is better); adhesion before and after repair was tested according to GB / T9286-1998 (cross-cut test) (grade 1 is the best, grade 5 is the worst), and the results are as follows: Examples 1-5 show a scratch healing rate of >89%, and the adhesion remains at Grade 1 after repair, demonstrating excellent self-healing performance.

[0040] Comparative Example 1 showed a healing rate of 0% and an adhesion level of 4 after repair. Due to the lack of self-healing polyurethane, scratch healing could not be achieved through molecular chain migration, and the scratch became a stress concentration point, resulting in a sharp drop in adhesion. Comparative Example 2 showed a healing rate of only 75% because the composite filler was unevenly dispersed, which hindered the migration of self-healing polyurethane molecules and the interfacial bonding was weak, resulting in decreased adhesion after repair. This invention achieves high thermal insulation, excellent weather resistance, and self-healing function in outdoor paints through specific components, fluorinated epoxy acrylate, modified composite thermal insulation filler, self-healing polyurethane, and process optimization.

[0041] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An outdoor paint with heat insulation properties, characterized in that, The product comprises the following components by weight: 40-60 parts of fluorinated epoxy acrylate resin matrix, 20-30 parts of fumed silica / perlite composite thermal insulation filler, 5-10 parts of nano alumina, 3-8 parts of silane coupling agent, and 10-15 parts of self-healing polyurethane. The fumed silica / perlite composite thermal insulation filler is a composite of fumed silica and expanded perlite that has undergone plasma surface treatment and epoxy resin microcapsule encapsulation. The silane coupling agent is specifically silane coupling agent 550.

2. The outdoor paint with heat insulation effect according to claim 1, characterized in that, The fluorinated epoxy acrylate resin matrix is ​​made by graft copolymerization of bisphenol A epoxy resin and acrylic monomer under the action of a free radical initiator, introducing fluorinated monomer for side chain modification, and then using a UV-LED segmented curing process.

3. The outdoor paint with heat insulation effect according to claim 2, characterized in that, The bisphenol A epoxy resin is E-44 epoxy resin, with a molar ratio of 5-7:1 to acrylic acid; the free radical initiator is benzoyl peroxide, with an initiator addition amount of 1wt-1.5wt% of the bisphenol A epoxy resin mass, a reaction temperature of 70-90℃, and a reaction time of 3-5h; the fluorinated monomer is perfluorooctyl ethyl acrylate, with an addition amount of 5wt-6wt% of the epoxy acrylate resin mass.

4. An outdoor paint with heat insulation effect according to claim 3, characterized in that, The UV-LED segmented curing process is as follows: first, irradiate with a wavelength of 365-405nm for 20-40s, and then irradiate with a wavelength of 260-300nm for 40-80s.

5. An outdoor paint with heat insulation effect according to claim 1, characterized in that, In the fumed silica / perlite composite thermal insulation filler, the mass ratio of fumed silica to expanded perlite is 1:2-4; the particle size of the fumed silica is 40-60 nm, and the particle size of the expanded perlite is 40-120 μm.

6. An outdoor paint with heat insulation effect according to claim 5, characterized in that, In the preparation of the fumed silica / perlite composite thermal insulation filler, the plasma surface treatment conditions are: power 250-350W, Ar atmosphere, treatment time 3-5min; the core material / wall material ratio of the epoxy resin microcapsule coating is 1:1.5-2.5, wherein the core material is a mixture of fumed silica and expanded perlite, and the wall material is epoxy resin.

7. An outdoor paint with heat insulation effect according to claim 6, characterized in that, The preparation method of the self-healing polyurethane is as follows: S1 raw material pretreatment: The amino-terminated polyether is dehydrated at 80-100℃ and vacuum degree of 0.08-0.1MPa for 1-2 hours, and the hexamethylene diisocyanate is dried. S2 prepolymerization reaction: The pretreated amino-terminated polyether and hexamethylene diisocyanate are added to the reactor at a molar ratio of 1:1.2-1.

5. Under nitrogen protection, they are mixed at a stirring rate of 200-300 r / min and heated to 60-80℃ for 1-1.5 h. S3 chain extension reaction: Slowly add chain extender 1,4-butanediol to the reaction vessel. The amount of chain extender added is 3-5% of the total weight of the terminal amino polyether and hexamethylene diisocyanate. The addition time is controlled at 30-40 min. Continue to react at 60-80℃ for 2-2.5 h. S4 Post-treatment: After the reaction is complete, cool down to below 40℃, add 0.1-0.3% of the polymerization inhibitor hydroquinone by weight of the reaction product, stir evenly and discharge to obtain self-healing polyurethane.

8. A method for preparing an outdoor paint with heat insulation effect according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Preparation of fluorinated epoxy acrylate resin matrix; (2) Preparation of fumed silica / perlite composite thermal insulation filler; (3) Mixed components: Take the fluorinated epoxy acrylate resin matrix prepared in step (1), the composite heat insulation filler prepared in step (2), nano alumina, silane coupling agent and self-healing polyurethane according to the weight parts, and stir and mix them evenly. (4) The mixed materials are sprayed with high pressure airless to form a coating, and after curing, outdoor paint is obtained.

9. A method for preparing an outdoor paint with heat insulation effect according to claim 8, characterized in that, In step (4), the pressure of the high-pressure airless spraying is 30-40 MPa and the nozzle orifice diameter is 0.4-0.6 mm.

10. The method for preparing an outdoor paint with heat insulation effect according to claim 8, characterized in that, In step (4), the thickness of the formed paint coating is 100-200μm; the curing is carried out by heat curing at 80℃ for 2-3 hours.