High-weatherability polyurethane intelligent temperature control coating and preparation method thereof

Abstract

The invention relates to the field of coatings, and provides a high-weatherability polyurethane intelligent temperature control coating and a preparation method thereof, the coating comprises the following raw materials by weight: 30-50 parts of modified polyurethane resin, 35-45 parts of intelligent temperature control slurry, 0.5-2 parts of a silane coupling agent, and 10-30 parts of an auxiliary agent. The coating provided by the invention has intelligent temperature control performance and also has good weather resistance.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and in particular to a highly weather-resistant polyurethane intelligent temperature-controlled coating and a preparation method thereof. Background Art

[0002] Intelligent temperature-control coatings contain thermal phase change materials that enable them to transmit infrared light at low temperatures and reflect infrared light at high temperatures. This property enables the coating to automatically adjust the indoor temperature according to the ambient temperature, reduce dependence on traditional energy, reduce energy consumption, achieve energy saving and environmental protection, and also have the advantages of reducing building energy consumption and improving residents' comfort. It has broad application prospects in construction, transportation, industry and other fields.

[0003] Despite the aforementioned excellent characteristics of intelligent temperature-control coatings, the increasing demands on production and life have also led to higher performance requirements for intelligent temperature-control coatings. In addition to having excellent intelligent temperature control capabilities, they must also possess characteristics such as long service life and high mechanical properties. In addition to thermal phase change materials with temperature control functions, the type of film-forming resin used in intelligent temperature-control coatings is also crucial. Polyurethane, among others, offers excellent elasticity, wear resistance, corrosion resistance, mechanical properties, and temperature resistance, making it an excellent film-forming resin. However, polyurethane itself is sensitive to ultraviolet rays and is prone to aging, resulting in poor weather resistance and a reduced service life.

[0004] Patent CN 118755299A discloses a thermosensitive intelligent control slurry, a thermosensitive intelligent control coating, and a preparation method. By preparing thermosensitive intelligent control nanoparticles and grinding and dispersing them, a thermosensitive intelligent control slurry is formed in a medium. The thermosensitive intelligent control slurry is further used to prepare a thermosensitive intelligent control coating. Although the thermosensitive intelligent control nanoparticles have a good intelligent temperature control effect, the film-forming resin of the coating is selected from one of acrylic resin, polyurethane resin, and epoxy resin. Both polyurethane resin and epoxy resin have poor aging resistance, which may lead to a decrease in the overall weather resistance of the coating.

[0005] Therefore, there is an urgent need on the market for a polyurethane intelligent temperature control coating with good weather resistance. Summary of the Invention

[0006] In response to the problems existing in the prior art, the present invention uses modified polyurethane resin as a film-forming resin and adds intelligent temperature control slurry to prepare a highly weather-resistant polyurethane intelligent temperature control coating, which has both intelligent temperature control performance and good weather resistance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: On the one hand, the present invention provides a highly weather-resistant polyurethane intelligent temperature control coating. The coating comprises the following raw materials, calculated by weight: 30-50 parts of modified polyurethane resin, 35-45 parts of intelligent temperature control slurry, 0.5-2 parts of leveling agent, 0.5-2 parts of silane coupling agent, and 10-30 parts of auxiliary agent.

[0008] In some embodiments of the present invention, the method for preparing the modified polyurethane resin comprises the following steps: 1) Dehydrate castor oil, polyethylene adipate, and 2-butanone and set aside; 2) adding the dried castor oil and polyethylene adipate obtained in step 1) to a reaction vessel filled with argon, adding dibutyltin dilaurate, heating to 75-80° C., adding isophorone diisocyanate and 2-butanone, and condensing and refluxing the entire process to obtain an intermediate product for later use; 3) Cooling the intermediate product of step 2) to 0-5°C, adding N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane and 2-butanone, stirring, heating to 40-60°C, adding triethylamine and mercaptopropyltrimethoxysilane, stirring, pouring into a mold, and curing to obtain a modified polyurethane resin.

[0009] In some embodiments of the present invention, in step 2), the mass ratio of isophorone diisocyanate, castor oil and polyethylene adipate is 1:(1.6-1.9):(0.2-0.5).

[0010] Preferably, in step 2), the mass ratio of isophorone diisocyanate, castor oil and polyethylene adipate is 1:1.725:0.375.

[0011] In some embodiments of the present invention, the mass ratio of isophorone diisocyanate to N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane is 1:(0.3-0.7).

[0012] Preferably, the mass ratio of isophorone diisocyanate to N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane is 1:0.45.

[0013] Polyurethane is lightweight, wear-resistant, and has good film-forming properties. It can be combined with a variety of substrates to form an excellent coating structure. However, the polyurethane resin itself has the disadvantages of being sensitive to ultraviolet rays and prone to aging, which will reduce the service life of the coating.

[0014] The applicant selected bio-based polyol castor oil, polyethylene adipate and isophorone diisocyanate as the main raw materials for synthesizing polyurethane. Castor oil was used to replace traditional chemical polyols, which has the advantages of being natural and environmentally friendly. Castor oil contains polyhydroxyl groups and long branched chain structures, which can form internal crosslinks with isophorone diisocyanate, making the polyurethane both rigid and elastic. Polyethylene adipate can adjust the internal crosslink density, thereby improving the weather resistance of the polyurethane to a certain extent. Furthermore, the applicant introduced N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane to modify the intermediate product. The amino group provided hydrogen atoms to react with isocyanate, and trimethoxysilane and alkyl long chains were introduced into the side chains of the modified polyurethane, so that a certain Si-O-Si crosslinking system was formed in the modified polyurethane structure, thereby increasing the crosslinking density of the modified polyurethane and effectively improving the weather resistance and mechanical properties of the modified polyurethane.

[0015] In some embodiments of the present invention, the intelligent temperature control slurry includes the following raw materials, calculated by weight: 2-6 parts of temperature control particles, 10-25 parts of 1-2 mol / L hydrochloric acid aqueous solution, 0.05-0.15 parts of polyvinyl pyrrolidone, 0.05-0.15 parts of polyethylene glycol, 0.01-0.06 parts of wetting agent, and 45-85 parts of auxiliary agent.

[0016] Wherein, the wetting agent is any one of BYK164, BYK163, and BYK165.

[0017] In some embodiments of the present invention, the method for preparing the temperature-controlled particles comprises the following steps: (1) Add butyl titanate to anhydrous ethanol and stir to obtain solution 1 for use; add ammonium molybdate to anhydrous ethanol and stir to obtain solution 2 for use; mix solution 1 and solution 2, add a mixed aqueous solution of hydrochloric acid / acetic acid, heat, stir, and obtain a mixed solution for use; (2) Ammonium vanadate, ammonium tungstate and ammonium molybdate are added to anhydrous ethanol in sequence, stirred, polyethylene glycol is added, stirred, the mixed solution of step (1) is added, stirred, triethylamine is added to adjust the pH to 9-10, heated, stirred, centrifuged, washed, dried, and calcined in the absence of oxygen to obtain temperature-controlled particles.

[0018] In some embodiments of the present invention, the mass ratio of ammonium vanadate to butyl titanate is 1:(0.05-0.2).

[0019] Preferably, the mass ratio of ammonium vanadate to butyl titanate is 1:0.1.

[0020] The applicant synthesized a molybdenum-tungsten-doped vanadium oxide thermal phase change material as a temperature-control particle. At the same time, the molybdenum-doped titanium oxide material effectively supplements the ultraviolet blocking and infrared reflection properties, giving the coating intelligent temperature control properties.

[0021] In some embodiments of the present invention, the invention further comprises 0.5-2 parts by weight of a leveling agent, wherein the leveling agent is a polyether-modified silicone leveling agent.

[0022] In some embodiments of the present invention, the preparation method of the polyether-modified silicone leveling agent comprises the following steps: Add double-ended hydrogenated silicone oil, side-chain hydrogenated silicone oil and hexahydrated chloroplatinic acid into a reaction kettle, introduce inert gas, heat to 85-95°C, add allyl polyether, keep the temperature and react for 5-6 hours, perform vacuum distillation, and cool to room temperature to obtain a polyether-modified silicone leveling agent.

[0023] In some embodiments of the present invention, the mass ratio of the side chain hydrogen-containing silicone oil, the double-terminal hydrogen-containing silicone oil and the allyl polyether is 1: (2-4): (0.5-1.5).

[0024] The applicant selected double-ended hydrogenated silicone oil, side-chain hydrogenated silicone oil and allyl polyether as raw materials, and obtained a polyether-modified silicone leveling agent through a one-pot addition polymerization reaction. By limiting the molecular weight of allyl polyether and its mass ratio to double-ended hydrogenated silicone oil and side-chain hydrogenated silicone oil, the prepared polyether-modified silicone leveling agent not only has good leveling properties but also improves the weather resistance and temperature resistance of the coating to a certain extent.

[0025] In some embodiments of the present invention, the auxiliary agent is any one of anhydrous ethanol, isopropyl alcohol, ethyl acetate, and butyl acetate.

[0026] Another aspect of the present invention further provides a method for preparing the highly weather-resistant polyurethane intelligent temperature-control coating described in the above technical solution, comprising the following steps: S1. Add the temperature-controlled particles to a hydrochloric acid aqueous solution, stir, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, a wetting agent and an auxiliary agent, and wet-grind to obtain an intelligent temperature-controlled slurry for later use; S2. Mix the modified polyurethane resin, leveling agent, silane coupling agent and additives, stir, add the intelligent temperature control slurry of step S1, stir, and sieve to obtain a highly weather-resistant polyurethane intelligent temperature control coating.

[0027] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses modified polyurethane resin as film-forming resin and adds molybdenum-tungsten-doped vanadium oxide thermal phase change material as temperature control particles to prepare a highly weather-resistant polyurethane intelligent temperature-control coating. Through the synergistic effect of the various components, the coating has intelligent temperature control performance and good weather resistance.

[0028] (2) The present invention uses bio-based polyol castor oil, polyethylene adipate and isophorone diisocyanate as the main raw materials for synthesizing polyurethane, and then introduces N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane to prepare a modified polyurethane resin, which effectively improves the weather resistance of the modified polyurethane.

[0029] (3) The coating prepared by the present invention has intelligent temperature control performance and good weather resistance, can be widely used in the field of temperature control coatings, and has good commercial application value. DETAILED DESCRIPTION

[0030] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples are illustrative of the present invention and are intended only to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the scope of the present invention may be made without departing from the spirit or scope of the present invention.

[0031] In the following examples and comparative examples, except for the modified polyurethane resin, the other compound monomers and related reagents used can be purchased from the market. Among them, polyethylene adipate was purchased from Jining Hongming Chemical Reagent Co., Ltd.; polyvinyl pyrrolidone was purchased from Jinan Zhengkang Chemical Co., Ltd.; polyethylene glycol was purchased from Jinan Jibin Chemical Co., Ltd.; double-terminal hydrogen-containing silicone oil was purchased from Hubei Xinyuhong Biomedicine Technology Co., Ltd.; side chain hydrogen-containing silicone oil was purchased from Jining Fangyu Chemical Co., Ltd.; and allyl polyether was APEG-1000.

[0032] Preparation Example 1: The synthetic method of modified polyurethane resin A comprises the following steps: 1) Dehydrate castor oil, polyethylene adipate, and 2-butanone and set aside; 2) 69 g of castor oil and 15 g of polyethylene adipate dried in step 1) were added to an argon-filled reaction vessel, followed by 10 ml of dibutyltin dilaurate. The mixture was heated to 80°C, and 40 g of isophorone diisocyanate and 20 ml of 2-butanone were added. The mixture was refluxed under condensation for 4 hours to obtain an intermediate product for later use. 3) The intermediate product from step 2) was cooled to 5°C, and 18 g of N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane and 40 ml of 2-butanone were added. The mixture was stirred for 2 h. The mixture was heated to 50°C, and 10 ml of triethylamine and 12 g of mercaptopropyltrimethoxysilane were added. The mixture was stirred for 4 h, poured into a mold, and cured at room temperature for 7 days to obtain modified polyurethane resin A.

[0033] Preparation Example 2: The specific implementation of modified polyurethane resin B is the same as that of modified polyurethane resin A, except that in step 2), the mass of castor oil is replaced by 60 g.

[0034] Preparation Example 3: The specific implementation manner of modified polyurethane resin C is the same as that of modified polyurethane resin A, except that in step 2), the mass of polyethylene adipate is replaced with 7 g.

[0035] Preparation Example 4: The specific implementation manner of modified polyurethane resin D is the same as that of modified polyurethane resin A, except that in step 3), the mass of N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane is replaced with 11 g.

[0036] Preparation Example 5: The synthesis method of temperature-controlled particles comprises the following steps: (1) Add 2 g of butyl titanate to 100 ml of anhydrous ethanol and stir for 30 min to obtain solution 1 for later use; add 0.04 g of ammonium molybdate to 20 ml of anhydrous ethanol and stir for 30 min to obtain solution 2 for later use; mix solution 1 and solution 2, add 0.2 mol / L hydrochloric acid / acetic acid mixed aqueous solution (the mass ratio of hydrochloric acid to acetic acid is 3:1), heat to 45 ° C, stir for 1 h, and obtain a mixed solution for later use; (2) 20 g of ammonium vanadate, 0.3 g of ammonium tungstate and 0.04 g of ammonium molybdate were added to 200 ml of anhydrous ethanol in sequence, stirred for 30 min, 1 g of polyethylene glycol was added, stirred for 30 min, the mixed solution of step (1) was added, stirred for 30 min, triethylamine was added to adjust the pH to 9.5, heated to 55 ° C, stirred for 24 h, centrifuged, washed with deionized water, dried at 60 ° C for 12 h, and calcined at 450 ° C for 5 h to obtain temperature-controlled particles.

[0037] Preparation Example 6: The synthesis method of polyether modified silicone leveling agent A comprises the following steps: 30 g of double-ended hydrogenated silicone oil, 10 g of side-chain hydrogenated silicone oil and 0.3 g of chloroplatinic acid hexahydrate were added to a reactor, nitrogen was introduced, and the reaction was heated to 90°C. 10 g of allyl polyether was added and the reaction was kept warm for 5.5 h. The reaction was carried out by vacuum distillation and cooled to room temperature to obtain polyether-modified silicone leveling agent A.

[0038] Preparation Example 7: The specific implementation manner of polyether-modified organic silicone leveling agent B is the same as that of polyether-modified organic silicone leveling agent A, except that the mass of allyl polyether is replaced with 4 g.

[0039] Example 1: A highly weather-resistant polyurethane intelligent temperature control coating, comprising the following raw materials, calculated by weight: 40 parts of modified polyurethane resin A, 40 parts of intelligent temperature control slurry, 1 part of polyether-modified silicone leveling agent A, 1 part of silane coupling agent KH570, and 20 parts of anhydrous ethanol; In terms of weight, the intelligent temperature control slurry includes the following raw materials: 4 parts of temperature control particles, 20 parts of 1.5 mol / L hydrochloric acid aqueous solution, 0.1 parts of polyvinyl pyrrolidone, 0.1 parts of polyethylene glycol, 0.04 parts of BYK164, and 60 parts of anhydrous ethanol.

[0040] The preparation method of the highly weather-resistant polyurethane intelligent temperature-control coating in this embodiment includes the following steps: S1. Add the temperature-controlled particles to a hydrochloric acid aqueous solution, stir for 2 h, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, BYK164, and anhydrous ethanol, and wet-grind for 2 h to obtain an intelligent temperature-controlled slurry for later use; S2. Mix modified polyurethane resin A, polyether modified silicone leveling agent A, silane coupling agent KH570 and anhydrous ethanol, stir for 1 hour, add the intelligent temperature control slurry of step S1, stir at 1200 r / min for 2 hours, and pass through a 200 mesh sieve to obtain a highly weather-resistant polyurethane intelligent temperature control coating.

[0041] Example 2: A highly weather-resistant polyurethane intelligent temperature control coating, comprising the following raw materials, calculated by weight: 30 parts of modified polyurethane resin A, 35 parts of intelligent temperature control slurry, 0.5 parts of polyether-modified silicone leveling agent A, 0.5 parts of silane coupling agent KH570, and 10 parts of isopropyl alcohol; In terms of weight, the intelligent temperature control slurry includes the following raw materials: 2 parts of temperature control particles, 10 parts of 1 mol / L hydrochloric acid aqueous solution, 0.05 parts of polyvinyl pyrrolidone, 0.05 parts of polyethylene glycol, 0.01 parts of BYK163, and 45 parts of isopropyl alcohol.

[0042] The preparation method of the highly weather-resistant polyurethane intelligent temperature-control coating in this embodiment includes the following steps: S1. Add the temperature-controlled particles to a hydrochloric acid aqueous solution, stir for 2 h, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, BYK163, and isopropyl alcohol, and wet-grind for 2 h to obtain an intelligent temperature-controlled slurry for later use; S2. Mix modified polyurethane resin A, polyether modified silicone leveling agent A, silane coupling agent KH570 and isopropyl alcohol, stir for 1 hour, add the intelligent temperature control slurry of step S1, stir at 1200 r / min for 2 hours, and pass through a 200 mesh sieve to obtain a highly weather-resistant polyurethane intelligent temperature control coating.

[0043] Example 3: A highly weather-resistant polyurethane intelligent temperature control coating, comprising the following raw materials, calculated by weight: 50 parts of modified polyurethane resin A, 45 parts of intelligent temperature control slurry, 2 parts of polyether-modified silicone leveling agent A, 2 parts of silane coupling agent KH570, and 30 parts of butyl acetate; In terms of weight, the intelligent temperature control slurry includes the following raw materials: 6 parts of temperature control particles, 25 parts of 2 mol / L hydrochloric acid aqueous solution, 0.15 parts of polyvinyl pyrrolidone, 0.15 parts of polyethylene glycol, 0.06 parts of BYK165, and 85 parts of butyl acetate.

[0044] The preparation method of the highly weather-resistant polyurethane intelligent temperature-control coating in this embodiment includes the following steps: S1. Add the temperature-controlled particles to a hydrochloric acid aqueous solution, stir for 2 h, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, BYK165, and butyl acetate, and wet-grind for 2 h to obtain an intelligent temperature-controlled slurry for later use; S2. Mix modified polyurethane resin A, polyether modified silicone leveling agent A, silane coupling agent KH570 and butyl acetate, stir for 1 hour, add the intelligent temperature control slurry of step S1, stir at 1200 r / min for 2 hours, and pass through a 200 mesh sieve to obtain a highly weather-resistant polyurethane intelligent temperature control coating.

[0045] Example 4: A highly weather-resistant polyurethane intelligent temperature control coating, comprising the following raw materials, calculated by weight: 40 parts of modified polyurethane resin A, 40 parts of intelligent temperature control slurry, 1 part of silane coupling agent KH570, and 20 parts of anhydrous ethanol; In terms of parts by weight, the intelligent temperature control slurry is the same as that in Example 1.

[0046] The preparation method of the highly weather-resistant polyurethane intelligent temperature-control coating in this embodiment includes the following steps: S1. Add the temperature-controlled particles to a hydrochloric acid aqueous solution, stir for 2 h, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, BYK164, and anhydrous ethanol, and wet-grind for 2 h to obtain an intelligent temperature-controlled slurry for later use; S2. Mix the modified polyurethane resin A, silane coupling agent KH570 and anhydrous ethanol, stir for 1 hour, add the intelligent temperature control slurry of step S1, stir at 1200 r / min for 2 hours, and pass through a 200 mesh sieve to obtain a highly weather-resistant polyurethane intelligent temperature control coating.

[0047] Example 5: This embodiment provides a highly weather-resistant polyurethane intelligent temperature control coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified polyurethane resin B replaces the modified polyurethane resin A in equal amounts.

[0048] Example 6: This embodiment provides a highly weather-resistant polyurethane intelligent temperature control coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified polyurethane resin C replaces the modified polyurethane resin A in equal amounts.

[0049] Example 7:This embodiment provides a highly weather-resistant polyurethane intelligent temperature control coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified polyurethane resin A is replaced by an equal amount of modified polyurethane resin D.

[0050] Example 8: This embodiment provides a highly weather-resistant polyurethane intelligent temperature control coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the polyether-modified silicone leveling agent A is replaced by an equal amount of polyether-modified silicone leveling agent B.

[0051] Comparative Example 1: This embodiment provides a highly weather-resistant polyurethane intelligent temperature control coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified polyurethane resin A is replaced by an equal amount of polyurethane resin.

[0052] Polyurethane resin was purchased from Guangdong Lankelu New Materials Co., Ltd.

[0053] The intelligent temperature control performance and weather resistance of the highly weather-resistant polyurethane intelligent temperature control coatings of Examples 1-8 and Comparative Example 1 were tested, and the test results are shown in Table 1.

[0054] The coatings prepared in the examples and comparative examples were coated on the surface of the PET film substrate with a thickness of 20 μm and dried at 80°C. After 100 minutes, the coating performance test was carried out.

[0055] (1) Intelligent temperature control performance The infrared blocking rate of the test coating changes when the temperature rises from 25℃ to 45℃. If the infrared blocking rate increases with the temperature, it proves that it has intelligent temperature control performance. The infrared blocking rate (1400nm) is tested by the solar film tester LS182.

[0056] (2) Weather resistance Weather resistance is judged by yellowing. After 30 hours of exposure using a carbon rod lamp-type sunlight atmospheric climate tester, the yellowing of the coating is measured using a colorimeter and expressed as the yellowing value (YI). The larger the yellowing value, the worse the weather resistance.

[0057] Table 1 Group Infrared blocking rate (25℃, %) Infrared blocking rate (45℃,%) Yellowing index (YI) Example 1 85 94 23 Example 2 83 92 25 Example 3 84 93 24 Example 4 82 91 27 Example 5 82 92 28 Example 6 82 91 29 Example 7 81 90 31 Example 8 82 92 26 Comparative Example 1 80 90 34 As can be seen from the data in Table 1, the infrared blocking rate of the coatings in Examples 1-8 of the present invention and Comparative Example 1 can change from 80-85% at 25°C to 90-94% at 45°C as the ambient temperature changes, indicating that they have intelligent temperature control performance; the coatings in Examples 1-3 have the characteristic of high weather resistance as a whole, among which Examples 5-7 respectively change the addition amount of castor oil, polyethylene adipate and N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane in the modified polyurethane resin, so that the weather resistance of the polyurethane resin is not well improved, resulting in an increase in the yellowing value of the coating; Example 4 and Example 8 respectively do not add a leveling agent and change the ratio of the key components in the leveling agent, which only have a slight effect on the weather resistance of the coating; Comparative Example 1 uses a polyurethane resin instead of the modified polyurethane resin A, and the test finds that the weather resistance of the coating shows poor results.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly weather-resistant polyurethane intelligent temperature control coating, characterized in that: Calculated by weight, the coating includes the following raw materials: 30-50 parts of modified polyurethane resin, 35-45 parts of intelligent temperature control slurry, 0.5-2 parts of silane coupling agent, and 10-30 parts of auxiliary agent.

2. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 1, characterized in that: The preparation method of the modified polyurethane resin comprises the following steps: 1) Dewatering castor oil, polyethylene adipate and 2-butanone for later use; 2) adding the dried castor oil and polyethylene adipate from step 1) into a reaction vessel filled with argon, adding dibutyltin dilaurate, heating to 75-80° C., adding isophorone diisocyanate and 2-butanone, condensing and refluxing throughout the process to obtain an intermediate product for later use; 3) Cooling the intermediate product of step 2) to 0-5°C, adding N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane and 2-butanone, stirring, heating to 40-60°C, adding triethylamine and mercaptopropyltrimethoxysilane, stirring, pouring into a mold, and curing to obtain a modified polyurethane resin.

3. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 2, characterized in that: In the step 2), the mass ratio of isophorone diisocyanate, castor oil and polyethylene adipate is 1:(1.6-1.9):(0.2-0.5).

4. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 2, characterized in that: The mass ratio of isophorone diisocyanate to N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane is 1:(0.3-0.7).

5. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 1, characterized in that: In terms of weight, the intelligent temperature control slurry includes the following raw materials: 2-6 parts of temperature control particles, 10-25 parts of 1-2 mol / L hydrochloric acid aqueous solution, 0.05-0.15 parts of polyvinyl pyrrolidone, 0.05-0.15 parts of polyethylene glycol, 0.01-0.06 parts of wetting agent, and 45-85 parts of auxiliary agent.

6. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 5, characterized in that: The preparation method of the temperature-controlled particles comprises the following steps: (1) adding butyl titanate to anhydrous ethanol and stirring to obtain solution 1 for later use; adding ammonium molybdate to anhydrous ethanol and stirring to obtain solution 2 for later use; mixing solution 1 and solution 2, adding a mixed aqueous solution of hydrochloric acid / acetic acid, heating, stirring, and obtaining a mixed solution for later use; (2) Add ammonium vanadate, ammonium tungstate and ammonium molybdate to anhydrous ethanol in sequence, stir, add polyethylene glycol, stir, add the mixed solution of step (1), stir, add triethylamine to adjust the pH to 9-10, heat, stir, centrifuge, wash, dry, and calcine in the absence of oxygen to obtain temperature-controlled particles.

7. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 6, characterized in that: The mass ratio of the ammonium vanadate to butyl titanate is 1:(0.05-0.2).

8. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 1, characterized in that: According to the weight percentage, the invention also includes 0.5-2 parts of a leveling agent, wherein the leveling agent is a polyether-modified organic silicon leveling agent.

9. The highly weather-resistant polyurethane intelligent temperature control coating according to claim 1 or 5, characterized in that: The auxiliary agent is any one of anhydrous ethanol, isopropanol, ethyl acetate and butyl acetate.

10. A method for preparing the highly weather-resistant polyurethane intelligent temperature-control coating according to any one of claims 8 to 9, characterized in that: The following steps are involved: S1. Add the temperature control particles into a hydrochloric acid aqueous solution, stir, centrifuge, add polyvinyl pyrrolidone, polyethylene glycol, a wetting agent and an auxiliary agent, wet grind, and obtain an intelligent temperature control slurry for use; S2, mixing the modified polyurethane resin, the leveling agent, the silane coupling agent and the auxiliary agent, stirring, adding the intelligent temperature control slurry of step S1, stirring, and sieving to obtain a polyurethane intelligent temperature control coating with high weather resistance.