Preparation method of super-hydrophobic functional coating with energy storage effect

Abstract

The invention discloses a preparation method of a super-hydrophobic functional coating with an energy storage effect. The preparation method comprises the following steps: (1) preparing a composite nano photo-thermal material; (2) preparing a hydrophobic hydrolyzed silane solution; (3) coating an organic silicon polyurethane main body; and (4) preparing the super-hydrophobic functional coating with an energy storage effect. The phase-change material is introduced for heat management in the anti-icing process, the surface of the prepared and sprayed super-hydrophobic functional coating with the energy storage function has efficient photo-thermal performance, the surface can be rapidly heated under sunlight, active deicing / defrosting is conducted at the low temperature, and heat management is conducted through latent heat released by the phase-change material when sunlight irradiation / cooling does not exist. And the time of reducing the surface temperature to the freezing point is effectively prolonged, so that the limitation caused by intermittent energy input is relieved. Besides, adhesion of supercooled liquid drops can be reduced due to the super-hydrophobic characteristic of the surface of the coating, the passive anti-icing performance of the coating is synergistically enhanced through the surface micro-nano structure in the two aspects of interface wettability and heat transfer characteristic, and the possibility of multi-scene application at low temperature is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anti-icing technology, in particular to a preparation method of super-hydrophobic functional coating with energy storage function. BACKGROUND

[0002] The icing / frosting phenomenon of solid surface brings many negative effects on people's production and life. Solar energy collection based on light-heat conversion has the highest conversion efficiency in theory, and the anti-icing coating with light-heat conversion performance has also attracted more and more attention. However, most of the current light-heat anti-icing coatings do not consider the actual factors such as low sunlight energy density on cloudy days and at night, intermittent sunlight energy input, and the like. The mismatch of energy supply and demand in time, space and intensity of the traditional light-heat anti-icing coating limits its surface anti- / de-icing function. Therefore, it is urgent to develop a new type of anti-icing coating which can effectively store and release energy on demand to cope with complex and variable environmental conditions.

[0003] Phase change materials (PCMs) can effectively store and release energy through phase change process to regulate temperature, which provides new inspiration for the design of light-heat anti-icing coating. Current research has confirmed the possibility of PCM application in the field of anti-icing, but there are still few anti-icing coatings combining light-heat performance, energy storage performance and bio-inspired surface wettability regulation. Therefore, how to integrate the advantages of the three, prepare a light-heat anti-icing coating that can be applied in complex environments, and realize multi-scene application at low temperature, is a problem to be solved at present. SUMMARY

[0004] The present application aims to solve the problem that the anti-icing performance of the traditional light-heat anti-icing coating is damaged when the sunlight energy density is low. In order to overcome the shortcomings of the prior art, a preparation method of super-hydrophobic functional coating with energy storage function is provided, which alleviates the limitation of intermittent solar energy supply in actual environment and shows potential application value in all-weather anti-icing field.

[0005] To solve the technical problem, the solution of the present application is as follows: The preparation method of super-hydrophobic functional coating with energy storage function comprises the following steps: (1) Preparation of coating organic silicon polyurethane main body: Take 10-100 parts by weight of double-end reactive polydimethylsiloxane, 1-10 parts by weight of polyisocyanate and 10-100 parts of solvent γ, mix uniformly, heat at 60-80℃ under nitrogen atmosphere for 1-4h to obtain isocyanate group terminated prepolymer, continue to add 1-10 parts by weight of bisamino / hydroxyl disulfide compound, 1-10 parts by weight of polyamine or polyol, mix uniformly, heat at 60-80℃ under nitrogen atmosphere for 1-4h to prepare organic silicon polyurethane solution as coating polymer main body; (2) Preparation of super-hydrophobic functional coating with energy storage function: In the organic silicone polyurethane solution prepared in (1), 10-100 parts by weight of composite nano-photothermal material, 10-100 parts by weight of hydrophobic hydrolyzed silane solution, and 10-100 parts by weight of phase change microcapsule PCM are added, and uniformly dispersed to obtain a super-hydrophobic functional coating with energy storage function.

[0006] Further, the weight average molecular weight of the double-end group reactive polydimethylsiloxane in (1) is 1000-10000; the double-end group in its molecular formula is one or more of hydroxypropyl, aminopropyl, and epoxy.

[0007] Further, the polyisocyanate in (1) is diisocyanate and / or triisocyanate, specifically one or more of hexamethylene diisocyanate, triphenylmethane triisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate.

[0008] Further, the solvent γ in (1) is one or more of tetrahydrofuran, acetone, dichloromethane, dimethylbenzene, N,N-dimethylformamide, ethyl acetate, and butyl acetate.

[0009] Further, the bis-amino / hydroxyl disulfide compound in (1) is one or more of 4,4'-diaminodiphenyl disulfide, bis(4-hydroxyphenyl) disulfide, 2,2'-diaminodiphenyl disulfide, bis(2-hydroxyethyl) disulfide, and 3,3'-dihydroxydiphenyl disulfide.

[0010] Further, the polyol in (1) is one or more of glycerol and butanediol; and the polyamine is one or more of triethylamine and hexanediamine.

[0011] Further, the preparation process of the composite nano-photothermal material in (2) is as follows: 1-100 parts by weight of nano-photothermal material A, 1-100 parts by weight of initiator, and 100-1000 parts by weight of solvent α are ultrasonically dispersed, then 1-100 parts by weight of nano-photothermal material B is added, and stirred at 0-40°C for 12-24h, centrifuged to obtain the initial solid, washed with solvent α and centrifuged to obtain the treated solid, and freeze-dried to obtain the composite nano-photothermal material; The nano-photothermal material A is one or more of MXene, carbon nanotube, MOF, pyrrole, graphene, and aniline; The nano-photothermal material B is one or more of MOF, pyrrole, aniline, MXene, graphene, and carbon nanotube; The solvent α is one or more of water, methanol, ethanol, tetrahydrofuran, acetone, and dichloromethane.

[0012] Further, the preparation process of the hydrophobic hydrolyzed silane solution in (2) is as follows: 1-100 parts by weight of deionized water is slowly added into 1-100 parts by weight of long alkyl chain silane solution to obtain an initial solution, the initial solution is continuously stirred in a constant temperature water bath shaker at 20-50 DEG C at a speed of 100-500 rpm for 0.5-2 h to make it fully hydrolyzed and condensed, then it is dissolved in 100-1000 parts by weight of solvent β and stirred uniformly at room temperature to obtain the hydrophobic hydrolyzed silane solution; The long alkyl chain silane is one or more of hexadecyltrimethoxysilane, trichlorooctadecylsilane, perfluorodecyltriethoxysilane and octadecyltrimethoxysilane; The solvent β is one or more of n-hexane, n-octane, n-heptane and n-pentane.

[0013] Further, the shell material of the phase change microcapsule PCM in (2) is polymethyl methacrylate, and the core material is one or more of n-tetradecane, n-hexadecane, n-octadecane and n-eicosane.

[0014] The coating method of the super-hydrophobic functional coating with energy storage function obtained by any of the preparation methods comprises the following steps: The surface to be sprayed is cleaned, the super-hydrophobic functional coating with energy storage function is uniformly coated on the surface to be sprayed in the form of air spraying, the coating thickness of the wet film is 100-1000 μm, and the surface to be sprayed is dried at room temperature to obtain the super-hydrophobic functional coating with energy storage function.

[0015] From the perspective of heat management regulation of the ice prevention process, the present application introduces a phase change material for process heat management, and synthesizes a composite nano photothermal substance, and then the composite nano photothermal substance is mixed with a hydrophobic hydrolyzed silane solution, a silicone matrix and a phase change material PCM to prepare a photothermal energy storage super-hydrophobic anti-icing coating with a micro-nano multi-level structure on the surface.

[0016] The traditional photothermal anti-icing coating is limited by the intermittent function of sunlight in practical application, in the present application, the photothermal energy storage super-hydrophobic anti-icing coating has high-efficiency photothermal performance, can rapidly heat the surface under one sunlight, actively removes ice / snow at low temperature, and releases latent heat through phase change of PCM for heat management when there is no sunlight, thereby effectively prolonging the time for the surface temperature to drop to the freezing point, and relieving the limitation of intermittent energy input. In addition, the super-hydrophobic property of the coating surface can make liquid droplets quickly leave the surface in the form of rolling or bouncing, reduce the adhesion of supercooled liquid droplets, and the micro-nano structure of the surface synergistically enhances the passive anti-icing performance of the coating from the interface wettability and heat transfer characteristics, and has the possibility of multi-scene application at low temperature.

[0017] Compared with the prior art, the application has the following beneficial effects: (1) The super-hydrophobic functional coating with energy storage function prepared by the application has a micro-phase separation structure of organic silicon polyurethane on the surface, which still has high elasticity and flexibility at extremely low temperature, thereby effectively reducing ice adhesion force through micro-deformation.

[0018] (2) The super-hydrophobic functional coating with energy storage function prepared by the application realizes more excellent photothermal performance by compounding nano-photothermal materials, and reduces the preparation cost.

[0019] (3) The super-hydrophobic functional coating with energy storage function prepared by the application greatly increases the roughness of the coating surface by combining hydrophobic silane and photothermal substances, and the constructed surface micro-nano structure synergistically enhances the passive anti-icing performance of the coating from the interface wettability and heat transfer characteristics. Compared with traditional anti-icing coatings, the coating can more effectively delay the icing of surface droplets, and at the same time, the internal rough structure can be used to scatter and greatly prolong the light propagation path, thereby significantly improving the photothermal effect of the coating surface, so that the coating has both active and passive deicing performance.

[0020] (4) The super-hydrophobic functional coating with energy storage function prepared by the application has significantly improved bonding force between different components (photothermal substances, phase change energy storage PCM and organic silicon polyurethane) in the coating, and the adhesion between the coating as a whole and the substrate is greatly improved.

[0021] (5) The super-hydrophobic functional coating with energy storage function prepared by the application integrates photothermal, energy storage and super-hydrophobic properties, and compared with traditional anti-icing coatings, it relieves the limitation of intermittent power supply, can match various complex environments, and brings new inspiration for all-weather anti- / deicing technology. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic diagram of the mechanism of the super-hydrophobic functional coating with energy storage function according to an embodiment of the application. DETAILED DESCRIPTION

[0023] The application will be further described in detail below in combination with specific embodiments and comparative examples. The embodiments can enable a person skilled in the art to more comprehensively understand the application, but do not limit the application in any way.

[0024] As Figure 1As shown, the application is based on the optimization of interfacial wettability and the process of ice prevention and thermal management. By synergizing the long hydrophobic alkyl chain and the surface micro-nano multi-level structure, the coating surface is endowed with super-hydrophobic properties, effectively reducing the solid-liquid contact area, increasing the nucleation energy barrier during freezing, and through increasing the heat transfer resistance and reducing the thermal conductivity, it has excellent passive anti-icing performance. Further, through the synergy of photothermal performance and phase change energy storage performance, the surface releases heat during the cooling process, realizing self-adaptive regulation and thermal management of the surface temperature. After stopping the sunlight irradiation, the time for the surface temperature to drop to the freezing point is greatly prolonged, relieving the low energy density and intermittency of sunlight in cold environments.

[0025] In the following examples, the shell material of the phase change microcapsule PCM is polymethyl methacrylate.

[0026] Example 1 The preparation and use method of the super-hydrophobic functional coating with energy storage function involved in this example are as follows: (1) Preparation of composite nano-photothermal material: 10 parts by weight of nano-photothermal material MXene, 10 parts by weight of initiator, and 100 parts by weight of deionized water were ultrasonically dispersed, then 10 parts by weight of aniline was added, and stirred at 0°C for 24 h. After centrifugal separation, the solid was washed with deionized water and centrifugally separated. Freeze-drying obtained the composite nano-photothermal material.

[0027] (2) Preparation of hydrophobic hydrolyzed silane solution: 1 part by weight of deionized water was slowly added to 10 parts by weight of hexadecyltrimethoxysilane solution, then it was continuously stirred at 100 rpm for 2 h in a 20°C constant temperature water bath shaker to fully hydrolyze and condense. Finally, it was dissolved in 100 parts by weight of solvent n-hexane and stirred uniformly at room temperature to obtain the hydrophobic hydrolyzed silane solution.

[0028] (3) Preparation of coating organic silicone polyurethane main body: Take 10 parts by weight of bis-hydroxypropyl end group reactive polydimethylsiloxane (molecular weight 1000), 1 part by weight of hexamethylene diisocyanate, and 10 parts by weight of tetrahydrofuran, mix uniformly, then heat under nitrogen atmosphere and at 60°C for 4 h to obtain an isocyanate group terminated prepolymer. Continue to add 1 part by weight of 4,4'-diamino diphenyl disulfide and 1 part by weight of triethylamine, mix uniformly, then heat under nitrogen atmosphere and at 60°C for 4 h to prepare the organic silicone polyurethane solution as the coating polymer main body.

[0029] (4) Preparation of super-hydrophobic functional coating with energy storage function: In the prepared silicone polyurethane solution of (3), 10 parts by weight of the composite nano-photothermal material prepared in the above (1), 10 parts by weight of the hydrophobic hydrolyzed silane solution prepared in the above (2), and 10 parts by weight of phase change microcapsules (PCM) with n-tetradecane as the core material were added and uniformly dispersed to obtain an energy storage super-hydrophobic functional coating.

[0030] (5) The coating application method of the energy storage super-hydrophobic functional coating: clean the surface to be sprayed, uniformly coat the energy storage super-hydrophobic functional coating on the surface to be sprayed in the form of air spraying, the coating thickness of the wet film is 100 μm, and the surface to be sprayed is dried at room temperature to obtain the energy storage super-hydrophobic functional coating.

[0031] Example 2 The preparation and use method of the energy storage super-hydrophobic functional coating involved in the present embodiment are as follows: (1) Preparation of composite nano-photothermal material: 20 parts by weight of nano-photothermal material carbon nanotube, 15 parts by weight of initiator, and 200 parts by weight of ethanol were ultrasonically dispersed, then 20 parts by weight of pyrrole was added, and stirred at 20°C for 18 h. After centrifugal separation, the solid was washed with ethanol and centrifugally separated. Freeze-drying obtained the composite nano-photothermal material.

[0032] (2) Preparation of hydrophobic hydrolyzed silane solution: 10 parts by weight of deionized water was slowly added dropwise into 30 parts by weight of trichloro-octadecylsilane solution, then it was continuously stirred at 150 rpm for 2 h in a 25°C constant temperature water bath shaker to fully hydrolyze and condense. Finally, it was dissolved in 300 parts by weight of solvent n-octane and stirred uniformly at room temperature to obtain the hydrophobic hydrolyzed silane solution.

[0033] (3) Preparation of coating silicone polyurethane main body: Take 25 parts by weight of bis-aminopropyl end group reactive polydimethylsiloxane (molecular weight 2500), 2 parts by weight of triphenylmethane triisocyanate, and 25 parts by weight of acetone, mix uniformly, then heat at 70°C under nitrogen atmosphere for 3 h to obtain an isocyanate group terminated prepolymer. Continue to add 2 parts by weight of bis(4-hydroxyphenyl) disulfide and 2 parts by weight of glycerol, mix uniformly, then heat at 65°C under nitrogen atmosphere for 3 h to prepare a silicone polyurethane solution as the coating polymer main body.

[0034] (4) Preparation of energy storage super-hydrophobic functional coating: In the prepared organic silicone polyurethane solution of (3), 15 parts by weight of the composite nano-photothermal material prepared in the above (1), 15 parts by weight of the hydrophobic hydrolyzed silane solution prepared in the above (2), and 15 parts by weight of phase change microcapsules (PCM) with n-hexadecane as the core material were added and uniformly dispersed to obtain an energy storage super-hydrophobic functional coating.

[0035] (5) Coating method of the energy storage super-hydrophobic functional coating: clean the surface to be sprayed, uniformly coat the energy storage super-hydrophobic functional coating on the surface to be sprayed by air spraying, the coating thickness of the wet film is 200 μm, and the surface to be sprayed is dried at room temperature to obtain the energy storage super-hydrophobic functional coating.

[0036] Example 3 The preparation and use method of the energy storage super-hydrophobic functional coating according to the present embodiment is as follows: (1) Preparation of the composite nano-photothermal material: 25 parts by weight of nano-photothermal material MOF, 25 parts by weight of initiator, and 300 parts by weight of dichloromethane were ultrasonically dispersed, then 25 parts by weight of aniline was added, and stirred at 30°C for 12 h. The solid was separated by centrifugation, washed with dichloromethane, and then centrifuged to obtain the solid. The composite nano-photothermal material was obtained by freeze-drying.

[0037] (2) Preparation of the hydrophobic hydrolyzed silane solution: 20 parts by weight of deionized water was slowly added dropwise into 40 parts by weight of perfluorodecyltriethoxysilane solution, then it was continuously stirred at 200 rpm for 1.5 h in a 30°C constant temperature water bath shaker to fully hydrolyze and condense. Finally, it was dissolved in 400 parts by weight of solvent n-heptane and stirred uniformly at room temperature to obtain the hydrophobic hydrolyzed silane solution.

[0038] (3) Preparation of the coating organic silicone polyurethane main body: 30 parts by weight of bis-epoxy-terminated reactive polydimethylsiloxane (molecular weight 3000), 2 parts by weight of diphenylmethane diisocyanate, and 30 parts by weight of ethyl acetate were uniformly mixed, then heated at 75°C for 3 h under a nitrogen atmosphere to obtain an isocyanate group terminated prepolymer. Then 3 parts by weight of 2,2'-diaminodiphenyl disulfide and 3 parts by weight of butanediol were added and uniformly mixed, and then heated at 75°C for 3 h under a nitrogen atmosphere to prepare an organic silicone polyurethane solution as the coating polymer main body.

[0039] (4) Preparation of the energy storage super-hydrophobic functional coating: In the prepared silicone polyurethane solution of (3), 20 parts by weight of the composite nano-photothermal material prepared in (1) above, 20 parts by weight of the hydrophobic hydrolyzed silane solution prepared in (2) above, and 20 parts by weight of phase change microcapsules (PCM) with n-octadecane as the core material are uniformly dispersed to obtain an energy storage super-hydrophobic functional coating.

[0040] (5) Coating method of the energy storage super-hydrophobic functional coating: clean the surface to be sprayed, uniformly coat the energy storage super-hydrophobic functional coating on the surface to be sprayed by air spraying, the coating thickness of the wet film is 300 μm, and the surface to be sprayed is dried at room temperature to obtain the energy storage super-hydrophobic functional coating.

[0041] Example 4 The preparation and use method of the energy storage super-hydrophobic functional coating according to the present embodiment is as follows: (1) Preparation of composite nano-photothermal material: 30 parts by weight of nano-photothermal material graphene, 25 parts by weight of initiator, and 400 parts by weight of acetone are ultrasonically dispersed, then 30 parts by weight of pyrrole is added, and stirred at 35°C for 12h, centrifuged to obtain a solid, then washed with acetone and centrifuged to obtain a solid. Freeze-drying to obtain a composite nano-photothermal material.

[0042] (2) Preparation of hydrophobic hydrolyzed silane solution: 30 parts by weight of deionized water is slowly added dropwise into 50 parts by weight of octadecyltrimethoxysilane solution, then it is continuously stirred at 200 rpm for 1h in a 35°C constant temperature water bath shaker to fully hydrolyze and condense. Finally, it is dissolved in 500 parts by weight of solvent n-pentane and stirred uniformly at room temperature to obtain a hydrophobic hydrolyzed silane solution.

[0043] (3) Preparation of silicone polyurethane main body of coating: 40 parts by weight of bis-hydroxypropyl end group reactive polydimethylsiloxane (molecular weight 4000), 4 parts by weight of isophorone diisocyanate, and 40 parts by weight of butyl acetate are mixed uniformly, then heated at 80°C for 2h under nitrogen atmosphere to obtain an isocyanate group terminated prepolymer, and then 4 parts by weight of bis(2-hydroxyethyl) disulfide and 4 parts by weight of hexanediamine are added, mixed uniformly, and heated at 80°C for 2h under nitrogen atmosphere to prepare a silicone polyurethane solution as the main body of the coating polymer.

[0044] (4) Preparation of energy storage super-hydrophobic functional coating: In the prepared silicone polyurethane solution of (3), 25 parts by weight of the composite nano-photothermal material prepared in the above (1), 25 parts by weight of the hydrophobic hydrolyzed silane solution prepared in the above (2), and 25 parts by weight of phase change microcapsules (PCM) with n-eicosane as the core material were added and uniformly dispersed to obtain an energy storage super-hydrophobic functional coating.

[0045] (5) The coating application method of the energy storage super-hydrophobic functional coating: clean the surface to be sprayed, uniformly coat the energy storage super-hydrophobic functional coating on the surface to be sprayed by air spraying, the coating thickness of the wet film is 400 μm, and the surface to be sprayed is dried at room temperature to obtain the energy storage super-hydrophobic functional coating.

[0046] Example 5 The preparation and use method of the energy storage super-hydrophobic functional coating related in this example are as follows: (1) Preparation of composite nano-photothermal material: 35 parts by weight of nano-photothermal material carbon nanotube, 30 parts by weight of initiator, and deionized water were ultrasonically dispersed in 400 parts by weight of deionized water, then 35 parts by weight of aniline was added, and stirred at 40°C for 10h, centrifuged to obtain a solid, then washed with deionized water and centrifuged to obtain a solid. Freeze-drying obtained a composite nano-photothermal material.

[0047] (2) Preparation of hydrophobic hydrolyzed silane solution: 35 parts by weight of deionized water was slowly added dropwise into 55 parts by weight of trichloro octadecyl silane solution, then it was continuously stirred at 200 rpm for 1h in a 40°C constant temperature water bath shaker to fully hydrolyze and condense. Finally, it was dissolved in 600 parts by weight of solvent n-hexane and stirred uniformly at room temperature to obtain a hydrophobic hydrolyzed silane solution.

[0048] (3) Preparation of silicone polyurethane main body of coating: Take 50 parts by weight of bis-aminopropyl end group reactive polydimethylsiloxane (molecular weight 5000), 5 parts by weight of hexamethylene diisocyanate, and 50 parts by weight of N,N-dimethylformamide, mix uniformly, then heat at 80°C for 2h under nitrogen atmosphere to obtain an isocyanate group terminated prepolymer, continue to add 5 parts by weight of 4,4'-diamino diphenyl disulfide and 5 parts by weight of triethylamine, mix uniformly, then heat at 80°C for 2h under nitrogen atmosphere to prepare a silicone polyurethane solution as the main body of the coating polymer.

[0049] (4) Preparation of energy storage super-hydrophobic functional coating: In the prepared organic silicone polyurethane solution of (3), 30 parts by weight of the composite nano-photothermal material prepared in (1) above, 30 parts by weight of the hydrophobic hydrolyzed silane solution prepared in (2) above, and 30 parts by weight of phase change microcapsules (PCM) with n-tetradecane as the core material are uniformly dispersed to obtain an energy storage super-hydrophobic functional coating.

[0050] (5) The coating method of the energy storage super-hydrophobic functional coating: clean the surface to be sprayed, and uniformly coat the energy storage super-hydrophobic functional coating on the surface to be sprayed by air spraying, the wet film coating thickness is 400 μm, and the surface to be sprayed is dried at room temperature to obtain the energy storage super-hydrophobic functional coating.

[0051] Comparative Example 2: The preparation method is the same as that of Example 1, but no phase change microcapsules PCM are added.

[0052] Performance evaluation results: (1) Anti-icing performance The anti-icing performance of the coating is tested by delaying liquid droplet freezing experiment and ice nucleation temperature experiment: For the delaying liquid droplet freezing experiment: the surface temperature of the sample is reduced to -15 ± 0.5℃ by a cooling platform. Then 3 μL of water droplets are added to the surface of the coating, and the change in water droplet morphology is recorded and timed using an optical contact angle instrument. When the water droplets are completely solidified and the top of the droplets becomes sharp, the timing is stopped, and the time is the delaying freezing time.

[0053] The anti-icing performance test results are shown in Table 1, and the energy storage super-hydrophobic functional coating of the present application effectively delays the liquid droplet freezing time.

[0054] (2) Photothermal performance A solar simulator-xenon lamp light source is used for testing, and is equipped with an AM-1.5 filter and a light feedback system. During the test, the light intensity is calibrated and adjusted to 1000 W / m 2 (1.0 sun), and the surface temperature of the coating is tested at a fixed light intensity by an infrared thermal imaging temperature measuring instrument. The photothermal performance test results are shown in Table 1.

[0055] (3) Photothermal defrosting performance The coating is placed in a constant temperature and humidity cold box at a specific temperature, after the surface is completely frosted, the xenon lamp is turned on to simulate sunlight, and the surface photothermal defrosting process is observed and recorded by a digital video camera.

[0056] Table 1 Test results of the photothermal energy storage super-hydrophobic anti-icing coating While the application has been described and illustrated in detail, and by reference to specific embodiments thereof, it is understood that the application is not limited to the particular forms illustrated and discussed. The application is to cover all modifications and alternatives falling within the scope of the application as defined by the appended claims.

Claims

1. A method for preparing a superhydrophobic functional coating with energy storage function, characterized in that, Includes the following steps: (1) Preparation of the silicone polyurethane matrix of the coating: Take 10-100 parts by weight of di-terminated reactive polydimethylsiloxane, 1-10 parts by weight of polyisocyanate and 10-100 parts by weight of solvent γ, mix them well and heat them under a nitrogen atmosphere and at 60-80℃ to obtain an isocyanate-terminated prepolymer. Then add 1-10 parts by weight of diamino / hydroxyl disulfide compound and 1-10 parts by weight of polyamine or polyol, mix them well and heat them under a nitrogen atmosphere and at 60-80℃ to prepare an organosilicon polyurethane liquid as the main polymer for coatings. (2) Preparation of superhydrophobic functional coatings with energy storage function: In the silicone polyurethane solution prepared in (1), 10-100 parts by weight of composite nanophotothermal material, 10-100 parts by weight of hydrophobic hydrolyzed silane solution, and 10-100 parts by weight of phase change microcapsules PCM are added and dispersed evenly to obtain a superhydrophobic functional coating with energy storage function.

2. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, The weight-average molecular weight of the dimethylsiloxane described in (1) is 1000-10000; the diterminal groups in its molecular formula are one or more of hydroxypropyl, aminopropyl, and epoxy groups.

3. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, The polyisocyanate mentioned in (1) is a diisocyanate and / or a triisocyanate, specifically one or more of hexamethylene diisocyanate, triphenylmethane triisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate.

4. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, The solvent γ mentioned in (1) is one or more of tetrahydrofuran, acetone, dichloromethane, xylene, N,N-dimethylformamide, ethyl acetate, and butyl acetate.

5. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, (1) The diamino / hydroxy disulfide compound is one or more of 4,4'-diaminodiphenyl disulfide, bis(4-hydroxyphenyl) disulfide, 2,2'-diaminodiphenyl disulfide, bis(2-hydroxyethyl) disulfide, and 3,3'-dihydroxydiphenyl disulfide.

6. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, (1) The polyol mentioned is one or more of glycerol and butanediol; the polyamine mentioned is one or more of triethylamine and hexamethylenediamine.

7. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, The preparation process of the composite nanophotothermal material described in (2) is as follows: 1-100 parts by weight of nano-photothermal material A and 1-100 parts by weight of initiator are ultrasonically dispersed in 100-1000 parts by weight of solvent α. Then, 1-100 parts by weight of nano-photothermal material B are added and stirred at 0-40℃ for 12-24h. The initial solid is obtained by centrifugation. The initial solid is washed with solvent α and centrifuged again to obtain the processed solid. The processed solid is then freeze-dried to obtain the composite nano-photothermal material. The nanophotothermal material A is one or more of MXene, carbon nanotubes, MOF, pyrrole, graphene, and aniline; The nanophotothermal material B is one or more of MOF, pyrrole, aniline, MXene, graphene, and carbon nanotubes; The solvent α is one or more of water, methanol, ethanol, tetrahydrofuran, acetone, and dichloromethane.

8. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, The preparation process of the hydrophobic hydrolyzed silane solution described in (2) is as follows: 1-100 parts by weight of deionized water were slowly added dropwise to 1-100 parts by weight of a long alkyl chain silane solution to obtain an initial solution. The initial solution was continuously stirred in a constant temperature water bath shaker at 20-50℃ at a speed of 100-500 rpm for 0.5-2 h to allow it to fully hydrolyze and condense. Then, it was dissolved in 100-1000 parts by weight of solvent β and stirred evenly at room temperature to obtain a hydrophobic hydrolyzed silane solution. The long alkyl chain silane is one or more selected from hexadecyltrimethoxysilane, trichlorooctadecylsilane, perfluorodecyltriethoxysilane, and octadecyltrimethoxysilane; The solvent β is one or more of n-hexane, n-octane, n-heptane, and n-pentane.

9. The method for preparing the superhydrophobic functional coating with energy storage function according to claim 1, characterized in that, (2) The shell material of the phase change microcapsule PCM is polymethyl methacrylate, and the core material is one or more of n-tetradecane, n-hexadecane, n-octadecane, and n-eicosane.

10. A method for applying the superhydrophobic functional coating with energy storage function obtained by any one of the preparation methods of claims 1-9, characterized in that, Includes the following steps: Clean the surface to be coated, and then uniformly coat the superhydrophobic coating with energy storage function onto the surface by air spraying. The wet film coating thickness is 100-1000μm. After drying at room temperature, the surface to be coated will have a superhydrophobic coating with energy storage function.

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