An ice-repellent electrically heated coating structure and a method for producing the same

Abstract

The present application relates to the technical field of aircraft deicing, and particularly relates to an anti-icing and deicing electric heating coating structure and a preparation method thereof, which comprises a first coating, a second coating and a third coating arranged in sequence from top to bottom, the raw material of the first coating comprises modified hydrophobic epoxy resin, polyether amine, ethanol, ethyl acetate and nano conductive carbon black; the raw material of the second coating comprises ethanol and nano silver wire; the third coating is a heat insulation layer, which prevents heat from being transmitted downward and ensures that the energy radiation of the electric heating is directed to the ice layer. The first coating has excellent super-hydrophobic performance, and in combination with the second coating, a composite heating structure is formed, a large amount of heat energy is generated through the electric heating effect, and is directly and quickly transmitted to the ice surface, so that the technical effect of rapid heating and stable and continuous electric heating work is realized, and the electric heating coating structure has excellent electric heating and super-hydrophobic functions, and meets the demand of aircraft anti-icing and deicing.

Description

Technical Field

[0001] This invention relates to the field of aircraft anti-icing technology, and in particular to an anti-icing electrically heated coating structure and its preparation method. Background Technology

[0002] Aircraft icing is widely considered one of the major hazards of aviation. When an aircraft passes through clouds with icing conditions, supercooled water droplets in the clouds impact the aircraft's windward side, causing icing to form on the surfaces of windward components (wings, windshields, tail fins, engine lips, pitot tubes, etc.), especially near the stagnation point. Icing of critical aircraft components severely affects their aerodynamic performance, leading to a rapid decline in safety. For example, icing on the leading edges of wings and tail fins alters the aircraft's aerodynamic shape to varying degrees, violating design principles, rapidly reducing lift and increasing drag, severely impacting handling and stability. Therefore, developing efficient anti-icing and de-icing strategies has become a pressing issue in aircraft flight.

[0003] Currently, the main anti-icing strategies include passive and active anti-icing methods. Passive anti-icing relies on special micro- and nano-structures on the surface (such as superhydrophobic and superslippery surfaces) to prevent ice from condensing or reduce the adhesion strength of ice, allowing it to fall off naturally. This method is energy-saving and easy to implement, but it has disadvantages such as poor durability and fragility. Active anti-icing includes electrothermal de-icing, mechanical vibration de-icing, and chemical reagent anti-icing. Among these, electrothermal de-icing has become one of the most reliable active anti-icing strategies due to its stable performance and high de-icing efficiency.

[0004] Combining passive hydrophobic anti-icing with active electrothermal de-icing can achieve superior anti-icing and de-icing capabilities. However, in the process of realizing this invention, the applicant discovered that existing superhydrophobic / electrothermal coupled anti-icing and de-icing technologies generally use composite coatings. However, due to the limitations of the raw materials and structure of the electrothermal anti-icing and de-icing composite coatings, the outward transfer of heat is hindered, and the anti-icing and de-icing effect is not as expected. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-icing and de-icing electrically heated coating structure and its preparation method to solve the above-mentioned technical problems existing in the prior art, mainly including the following two aspects:

[0006] The first aspect of the present application provides an ice-preventing electric heating coating structure, comprising a first coating, a second coating and a third coating arranged in sequence from top to bottom, the raw material of the first coating comprises 4-6 parts by weight of modified hydrophobic epoxy resin, 1.0-1.5 parts by weight of polyether amine, 25-35 parts by weight of ethanol, 25-35 parts by weight of ethyl acetate and 0.6-1.0 parts by weight of nano conductive carbon black; the raw material of the second coating comprises ethanol and nano silver wire, and the ratio of the nano silver wire to the ethanol is 0.8-1.2 mg / mL; the third coating is a thermal insulation layer; the modified hydrophobic epoxy resin is obtained by modifying the epoxy resin with γ-glycidyl ether oxypropyl trimethoxysilane, heptadecafluorodecyl trimethoxysilane and a curing agent.

[0007] Further, the raw material of the first coating comprises 4.5-5.5 parts by weight of modified hydrophobic epoxy resin, 1.2-1.3 parts by weight of polyether amine, 28-32 parts by weight of ethanol, 28-32 parts by weight of ethyl acetate and 0.7-0.9 parts by weight of nano conductive carbon black.

[0008] Further, in the raw material of the second coating, the ratio of the nano silver wire to the ethanol is 0.9-1.1 mg / mL.

[0009] Further, the modification of the modified hydrophobic epoxy resin comprises the following steps: first, reacting γ-glycidyl ether oxypropyl trimethoxysilane and heptadecafluorodecyl trimethoxysilane under alkaline conditions to generate an oligomer, and then adding the oligomer into the epoxy resin to obtain the modified hydrophobic epoxy resin.

[0010] Further, the raw material of the third coating comprises 4-6 parts by weight of modified hydrophobic epoxy resin, 1.0-1.5 parts by weight of polyether amine, 25-35 parts by weight of ethanol, 25-35 parts by weight of ethyl acetate and 0.4-0.6 parts by weight of thermal insulation filler.

[0011] Further, the thermal insulation filler is at least one of hollow glass microbeads, expanded perlite, expanded vermiculite and sepiolite.

[0012] Further, the particle size of the thermal insulation filler is 10-30 microns.

[0013] The first aspect of the present application provides a preparation method of the above-mentioned electric heating coating structure, characterized in that it comprises the following steps:

[0014] In step S100, the modified hydrophobic epoxy resin, the polyether amine, the ethanol, the ethyl acetate and the nano conductive carbon black in the raw material of the first coating are mixed uniformly to obtain a first solution;

[0015] The raw material of the second coating is used to prepare an ethanol dispersion of nano silver wires by a melt gel method, and the concentration is regulated to be 0.8 mg / mL to 1.2 mg / mL, to obtain a second solution;

[0016] In step S200, the third coating is prepared by using the third solution, after the third coating is dried, the second coating is prepared on the surface of the third coating by using the second solution, after the second coating is dried, the first coating is prepared on the surface of the second coating by using the first solution at 70 DEG C to 90 DEG C, to obtain an electric heating coating structure.

[0017] In step S100, the following steps are included:

[0018] In step S100, the modified hydrophobic epoxy resin, the polyether amine, the ethanol, the ethyl acetate and the nano conductive carbon black in the raw material of the first coating are mixed uniformly to obtain a first solution;

[0019] The raw material of the second coating is used to prepare an ethanol dispersion of nano silver wires by a melt gel method, and the concentration is regulated to be 0.8 mg / mL to 1.2 mg / mL, to obtain a second solution;

[0020] 4 parts by weight to 6 parts by weight of the modified hydrophobic epoxy resin, 1.0 part by weight to 1.5 part by weight of the polyether amine, 25 parts by weight to 35 parts by weight of the ethanol, 25 parts by weight to 35 parts by weight of the ethyl acetate, and 0.4 part by weight to 0.6 part by weight of the heat insulation filler are mixed uniformly to obtain a third solution;

[0021] In step S200, the third coating is prepared by using the third solution, after the third coating is dried, the second coating is prepared on the surface of the third coating by using the second solution, after the second coating is dried, the first coating is prepared on the surface of the second coating by using the first solution at 70 DEG C to 90 DEG C, to obtain an electric heating coating structure.

[0022] In step S100, the third coating, the second coating and the first coating are prepared by using a spraying or brushing mode;

[0023] And / or, the drying is drying at 70 DEG C to 90 DEG C for 20 min to 80 min.

[0024] The present application has at least the following technical effects relative to the prior art:

[0025] The resin in the first coating layer has excellent waterproof performance, and through the cooperation of the first coating layer and the second coating layer, the nano conductive carbon black in the first coating layer and the silver nanowire in the second coating layer serve as a heating layer to generate an electrothermal effect, and the heat can be directly and quickly transmitted to the ice surface, effectively avoiding the inhibition of the hydrophobic surface layer on the electrothermal effect in the prior art, realizing the technical effects of rapid heating and stable and continuous electrothermal work, and the weak conductivity makes the electrical influence on the external environment in the electrothermal deicing process negligible, ensuring the safe use of the electrothermal function; in addition, the addition of the nano conductive carbon black does not destroy the hydrophobic function, so that the electric heating coating structure has excellent electrothermal function and hydrophobic function, meeting the demand of aircraft deicing. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 is a structural schematic diagram of the electric heating coating structure of the present application;

[0028] Figure 2 is a hydrophobic performance test diagram of the electric heating coating structure of the present application;

[0029] Figure 3 is a temperature change diagram of the electric heating coating structure of the present application for periodic electrothermal heating;

[0030] Figure 4 is a temperature change diagram of the electric heating coating structure of the present application for long-time electrothermal heating;

[0031] In the figure, 110 is the first coating layer; 120 is the second coating layer; and 130 is the third coating layer. DETAILED DESCRIPTION

[0032] The following description provides many different embodiments, or examples, for implementing different features of the application. Specific examples are described in the following to describe elements and arrangements of the application, which are only used to express the application, and are only examples, and are not intended to limit the application.

[0033] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0034] Composite materials are materials composed of two or more different materials, which can make various materials complement each other in performance, produce synergistic effects, have the advantages of light weight, corrosion resistance, good environmental adaptability, etc. With the continuous advancement of research in the field of composite materials, most of the research on deicing strategies has also gradually focused on composite coatings, hoping to combine passive hydrophobic deicing and active electric heating deicing to achieve better deicing ability. In the existing electric heating deicing composite coating technology that combines passive hydrophobic deicing and active electric heating deicing, such as the super-hydrophobic coating plasma and graphene electric heating composite deicing device and method disclosed in Chinese Patent Publication No. CN114104299A, which includes a bottom graphene electric heating film, an insulating layer, a bare electrode, and a super-hydrophobic coating. The graphene electric heating film is used to heat and warm up to achieve deicing, and the super-hydrophobic coating is used to reduce the adhesion of water droplets to achieve anti-icing. However, when the graphene electric heating film is used to heat and warm up for deicing, the super-hydrophobic coating will inhibit the heat transfer of the bottom graphene electric heating film, resulting in poor heating efficiency and heating effect, and the deicing effect is not as expected. If the thickness of the super-hydrophobic coating is reduced to reduce the inhibition of heat transfer, the anti-icing effect will be reduced, and thus it is difficult to achieve excellent electric heating performance while ensuring the hydrophobic anti-icing effect.

[0035] Therefore, the present application provides an anti-icing electric heating coating structure that can have both hydrophobic anti-icing performance and electric heating deicing effect, such as Figure 1As shown, the first coating layer 110, the second coating layer 120 and the third coating layer 130 are sequentially arranged from top to bottom, the raw materials of the first coating layer 110 include 4-6 parts by weight of modified hydrophobic epoxy resin, 1.0-1.5 parts by weight of polyether amine, 25-35 parts by weight of ethanol, 25-35 parts by weight of ethyl acetate, and 0.6-1.0 parts by weight of nano conductive carbon black; the raw materials of the second coating layer 120 include ethanol and nano silver wire, and the ratio of nano silver wire to ethanol is 0.8-1.2 mg / mL; the third coating layer 130 is a thermal insulation layer; and the modified hydrophobic epoxy resin is obtained by modifying the epoxy resin with γ-glycidyl ether propyl trimethoxysilane, heptadecafluorodecyl trimethoxysilane and a curing agent.

[0036] The modified hydrophobic epoxy resin is used to enhance the hydrophobic property of the first coating layer, thereby realizing passive ice prevention. Meanwhile, the nano silver wire uniformly dispersed in the second coating layer 120 is used for conduction, which, in combination with the nano conductive carbon black in the first coating layer 110, exhibits weak conductivity and excellent electrothermal property. The weak conductivity enables the nano conductive carbon black in the first coating layer 110 to generate an electrothermal effect when the second coating layer 120 is powered on, and the heat can be directly and quickly transferred to the ice surface, thereby effectively avoiding the inhibition of the electrothermal effect by the hydrophobic surface layer in the prior art, realizing rapid heating and stable and continuous electrothermal working, and making the electrical influence on the external environment negligible during the electrothermal deicing process, thereby ensuring the safe use of the electrothermal function. In addition, based on the synergy of the modified hydrophobic epoxy resin, polyether amine, ethanol and ethyl acetate in a specific ratio, the nano conductive carbon black can be uniformly and stably dispersed, thereby realizing excellent electrothermal property in the first coating layer (surface layer), and the first coating layer can exhibit excellent hydrophobic property without being damaged by the addition of the nano conductive carbon black, thereby realizing passive ice prevention. In addition, the resin in the first coating layer 110 can exhibit good electrothermal resistance during the electrothermal deicing process, so that the first coating layer 110 remains stable in structure during the electrothermal deicing process, thereby achieving the coupling of hydrophobicity and electrothermal property, and enabling the electrothermal coating structure to have excellent electrothermal function and hydrophobic function, thereby meeting the requirements of aircraft deicing.

[0037] Specifically, the raw materials of the first coating layer 110 include 4.5-5.5 parts by weight of modified hydrophobic epoxy resin, 1.2-1.3 parts by weight of polyether amine, 28-32 parts by weight of ethanol, 28-32 parts by weight of ethyl acetate, and 0.7-0.9 parts by weight of nano conductive carbon black.

[0038] Specifically, in the raw material of the second coating layer 120, the ratio of the nano-silver wire and the ethanol is 0.9 mg / mL~1.1 mg / mL.

[0039] Specifically, the modification of the modified hydrophobic epoxy resin comprises the following steps: first, 25.1 g of γ-glycidyl ether propyltrimethoxysilane and 14.9 g of heptadecafluorodecyltrimethoxysilane are reacted under alkaline conditions at room temperature to generate an oligomer, and then the oligomer is added to 60 g of epoxy resin to obtain the modified hydrophobic epoxy resin.

[0040] Specifically, the raw material of the third coating layer 130 comprises 4 parts by weight~6 parts by weight of the modified hydrophobic epoxy resin, 1.0 parts by weight~1.5 parts by weight of the polyetheramine, 25 parts by weight~35 parts by weight of the ethanol, 25 parts by weight~35 parts by weight of the ethyl acetate, and 0.4 parts by weight~0.6 parts by weight of the thermal insulation filler.

[0041] Specifically, the thermal insulation filler is at least one of hollow glass microbeads, expanded perlite, expanded vermiculite, and sepiolite.

[0042] Specifically, the particle size of the thermal insulation filler is 10 microns~30 microns. Preferably, the average particle size of the thermal insulation filler is 20 microns.

[0043] Example 1

[0044] A preparation method of an electric heating coating structure, comprising the following steps:

[0045] In step S100, a dispersion mixer is used to mix 4.8 g of the modified hydrophobic epoxy resin, 1.0 g of the polyetheramine, 30 g of the ethanol, 30 g of the ethyl acetate, and 0.81 g of the nano-conductive carbon black in the raw material of the first coating layer to form a black gel-like liquid, thereby obtaining a first solution;

[0046] The raw material of the second coating layer is used to prepare an ethanol dispersion of nano-silver wire by a molten glue gel method, and the concentration is controlled to be 0.98 mg / mL, thereby obtaining a second solution;

[0047] A dispersion mixer is used to mix 4.9 g of the modified hydrophobic epoxy resin, 1.0 g of the polyetheramine, 33 g of the ethanol, 28 g of the ethyl acetate, and 0.5 g of the expanded perlite in the raw material of the third coating layer to form a gel-like liquid, thereby obtaining a third solution;

[0048] Step S200, the third solution is sprayed on the glass sheet by a spray gun to prepare a third coating layer, which is dried in an oven at 80℃ for 35min, then the second solution is sprayed on the surface of the third coating layer by a spray gun to prepare a second coating layer, which is dried in an oven at 80℃ for 55min, after the second coating layer is dried, the first solution is sprayed on the surface of the second coating layer by a spray gun in an 80℃ environment to prepare a first coating layer, which is dried in an oven at 80℃ for 55min, to obtain an electric heating coating structure.

[0049] When spraying the first coating layer, it is sprayed while being heated in an 80℃ environment, ethanol and ethyl acetate are used for rapid evaporation, a large number of micro-pores are formed on the surface of the first coating layer, and the intrinsic nano-structure of the nano-material in the first coating layer is combined to form a rough surface micro-nano classification structure on the surface of the coating layer, thereby increasing the hydrophobic property of the first coating layer and realizing the super-hydrophobic anti-icing function.

[0050] Example 2

[0051] A preparation method of an electric heating coating structure, comprising the following steps:

[0052] Step S100, the first coating layer is prepared by mixing 4.5g of modified hydrophobic epoxy resin, 1.3g of polyether amine, 28g of ethanol, 32g of ethyl acetate, and 0.75g of nano-conductive carbon black in a dispersion mixer to form a black gel-like liquid, to obtain a first solution;

[0053] The second coating layer is prepared by using a melt glue gel method to prepare an ethanol dispersion liquid of nano-silver wires from the second coating layer raw materials, and adjusting the concentration to 1.05mg / mL, to obtain a second solution;

[0054] The third solution is prepared by mixing 4.5g of modified hydrophobic epoxy resin, 1.3g of polyether amine, 28g of ethanol, 32g of ethyl acetate, 0.52g of hollow glass microspheres and sepiolite in a dispersion mixer to form a gel-like liquid;

[0055] Step S200, the third solution is sprayed on the glass sheet by a spray gun to prepare a third coating layer, which is dried in an oven at 80℃ for 30min, then the second solution is sprayed on the surface of the third coating layer by a spray gun to prepare a second coating layer, which is dried in an oven at 82℃ for 55min, after the second coating layer is dried, the first solution is sprayed on the surface of the second coating layer by a spray gun in a 75℃ environment to prepare a first coating layer, which is dried in an oven at 82℃ for 55min, to obtain an electric heating coating structure.

[0056] Example 3

[0057] A preparation method of an electric heating coating structure, comprising the following steps:

[0058] Step S100, using a dispersion blender to mix 6g of modified hydrophobic epoxy resin, 1.5g of polyether amine, 35g of ethanol, 35g of ethyl acetate, 1.0g of nano conductive carbon black in the first coating raw material uniformly, forming a black gel liquid, to obtain a first solution;

[0059] The second coating raw material is used to prepare an ethanol dispersion of nano silver wire by a melt glue gel method, and the concentration is controlled to be 1.2mg / mL, to obtain a second solution;

[0060] Using a dispersion blender to mix 6g of modified hydrophobic epoxy resin, 0.5g of polyether amine, 35g of ethanol, 35g of ethyl acetate, 0.6g of hollow glass beads and expanded vermiculite uniformly, forming a gel liquid, to obtain a third solution;

[0061] Step S200, using the third solution to spray on the glass sheet by a spray gun, to prepare a third coating, and then placing it in an oven to dry at 75℃ for 35min, then using the second solution to spray the second coating on the surface of the third coating by a spray gun, to prepare a second coating, and then placing it in an oven to dry at 80℃ for 70min, after the second coating is dried, using the first solution to spray on the surface of the second coating by a spray gun in a 90℃ environment, to prepare a first coating, and then placing it in an oven to dry at 75℃ for 70min, to obtain an electric heating coating structure.

[0062] Example 4

[0063] A preparation method of an electric heating coating structure, comprising the following steps:

[0064] Step S100, using a dispersion blender to mix 4g of modified hydrophobic epoxy resin, 1.1g of polyether amine, 25g of ethanol, 26g of ethyl acetate, 0.65g of nano conductive carbon black in the first coating raw material uniformly, forming a black gel liquid, to obtain a first solution;

[0065] The second coating raw material is used to prepare an ethanol dispersion of nano silver wire by a melt glue gel method, and the concentration is controlled to be 0.95mg / mL, to obtain a second solution;

[0066] Using a dispersion blender to mix 4g of modified hydrophobic epoxy resin, 1.0g of polyether amine, 25g of ethanol, 25g of ethyl acetate, 0.4g of hollow glass beads uniformly, forming a gel liquid, to obtain a third solution;

[0067] Step S200, the third solution is sprayed on the glass sheet by a spray gun to prepare a third coating layer, which is dried in an oven at 70℃ for 40min, then the second solution is sprayed on the surface of the third coating layer by a spray gun to prepare a second coating layer, which is dried in an oven at 90℃ for 40min, after the second coating layer is dried, the first solution is sprayed on the surface of the second coating layer by a spray gun in a 70℃ environment to prepare a first coating layer, which is dried in an oven at 70℃ for 80min, to obtain the electric heating coating structure.

[0068] Example 5

[0069] A preparation method of an electric heating coating structure, comprising the following steps:

[0070] Step S100, a dispersing mixer is used to uniformly mix 5g of modified hydrophobic epoxy resin, 1.25g of polyether amine, 30g of ethanol, 30g of ethyl acetate and 0.8g of nano conductive carbon black in the raw materials of the first coating layer to form a black gel-like liquid, to obtain a first solution;

[0071] The raw materials of the second coating layer are used to prepare an ethanol dispersion of nano silver wires by a gel melting gel method, and the concentration is controlled to be 1.0mg / mL, to obtain a second solution;

[0072] A dispersing mixer is used to uniformly mix 5g of modified hydrophobic epoxy resin, 0.25g of polyether amine, 30g of ethanol, 30g of ethyl acetate and 0.5g of hollow glass microbeads in the raw materials of the third coating layer to form a gel-like liquid, to obtain a third solution;

[0073] Step S200, the third solution is sprayed on the glass sheet by a spray gun to prepare a third coating layer, which is dried in an oven at 70℃ for 40min, then the second solution is sprayed on the surface of the third coating layer by a spray gun to prepare a second coating layer, which is dried in an oven at 90℃ for 40min, after the second coating layer is dried, the first solution is sprayed on the surface of the second coating layer by a spray gun in a 70℃ environment to prepare a first coating layer, which is dried in an oven at 70℃ for 80min, to obtain the electric heating coating structure.

[0074] Test Example 1

[0075] The electric heating coating structure prepared in Example 5 is subjected to hydrophobicity test, and a water drop is placed on the surface of the first coating layer of the electric heating coating structure, and the results are shown in Figure 2 The contact angle between the surface of the electric heating coating structure and water is 158°, realizing super-hydrophobic function.

[0076] The electric heating coating structure prepared in Example 5 is subjected to electric heating performance test, and the results are shown in Figure 3 and Figure 4 from Figure 3It can be seen that the electric heating coating structure can realize rapid temperature rise from 20℃ to 70℃ in a very short time (125s) and steady rise and fall in 10 cycles when the power density is 0.2W / cm 2 , which can realize continuous and stable periodic electric heating work, indicating that the electric heating coating structure has excellent electric heating conversion rate and repeatability. Figure 4 The long-time heating characteristics of the electric heating coating structure are shown when the power density is 0.2W / cm 2 . Figure 4 It can be seen that the electric heating coating structure can still maintain good heating ability under long-time working condition, with the temperature stably maintained at about 95℃, indicating that the electric heating coating structure has excellent long-term heating performance; after the electric heating performance test, the hydrophobicity test is performed again, and the contact angle between the surface of the electric heating coating structure and water is still 158°, indicating that the electric heating coating structure has both super-hydrophobic function and continuous and stable electric heating function.

[0077] Test Example 2

[0078] Different from Test Example 1, the electric heating coating structure prepared in Example 4 is subjected to hydrophobicity test and electric heating performance test, and the contact angle between the surface of the electric heating coating structure and water is 156°; the electric heating coating structure can realize rapid temperature rise from 20℃ to 60℃ in a very short time (125s) and steady rise and fall in 10 cycles when the power density is 0.15W / cm 2 , and can still maintain good heating ability under long-time working condition, with the temperature stably maintained at about 85℃.

[0079] Test Example 3

[0080] Different from Test Example 1, the electric heating coating structure prepared in Example 3 is subjected to hydrophobicity test and electric heating performance test, and the contact angle between the surface of the electric heating coating structure and water is 154°; the electric heating coating structure can realize rapid temperature rise from 20℃ to 52℃ in a very short time (125s) and steady rise and fall in 10 cycles when the power density is 0.1W / cm 2 , and can still maintain good heating ability under long-time working condition, with the temperature stably maintained at about 75℃.

[0081] Test Example 4

[0082] Different from Test Example 1, the electric heating coating structure prepared in Example 2 is subjected to hydrophobicity test and electric heating performance test, and the contact angle between the surface of the electric heating coating structure and water is 155°; the electric heating coating structure can realize rapid temperature rise from 20℃ to 60℃ in a very short time (125s) and steady rise and fall in 10 cycles when the power density is 0.25W / cm 2In this case, the temperature can be rapidly increased from 20 DEG C to 90 DEG C in a very short time (125s), and steadily increased and decreased in 10 cycles, and the heating ability can be maintained in a long time working state, and the temperature can be steadily maintained at about 108 DEG C.

[0083] Test Example 5

[0084] In comparison with Test Example 1, the hydrophobicity test and the electric heating performance test were conducted on the electric heating coating structure prepared in Example 1, the contact angle of the surface of the electric heating coating structure with water was 158 DEG ; the temperature of the electric heating coating structure can be rapidly increased from 20 DEG C to 42 DEG C in a very short time (125s), and steadily increased and decreased in 10 cycles, and the heating ability can be maintained in a long time working state, and the temperature can be steadily maintained at about 63 DEG C. 2 In this case, the temperature can be rapidly increased from 20 DEG C to 90 DEG C in a very short time (125s), and steadily increased and decreased in 10 cycles, and the heating ability can be maintained in a long time working state, and the temperature can be steadily maintained at about 108 DEG C.

[0085] The above description is merely preferred embodiments of the present application but not to confine the present application. Any modification, equivalent replacement and improvement made in the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An anti-icing and de-icing electrically heated coating structure, characterized in that, The coating comprises a first coating, a second coating, and a third coating arranged sequentially from top to bottom. The raw materials for the first coating include 4 to 6 parts by weight of modified hydrophobic epoxy resin, 1.0 to 1.5 parts by weight of polyetheramine, 25 to 35 parts by weight of ethanol, 25 to 35 parts by weight of ethyl acetate, and 0.6 to 1.0 parts by weight of nano-conductive carbon black. The raw materials for the second coating include ethanol and nano-silver wires, with the ratio of nano-silver wires to ethanol being 0.8 mg / mL to 1.2 mg / mL. The third coating is a heat insulation layer. The modified hydrophobic epoxy resin is obtained by modifying epoxy resin with γ-glycidoxypropyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, and a curing agent.

2. The electroheating coating structure as described in claim 1, characterized in that, The raw materials for the first coating include 4.5 to 5.5 parts by weight of modified hydrophobic epoxy resin, 1.2 to 1.3 parts by weight of polyetheramine, 28 to 32 parts by weight of ethanol, 28 to 32 parts by weight of ethyl acetate, and 0.7 to 0.9 parts by weight of nano-conductive carbon black.

3. The electroheating coating structure as described in claim 1, characterized in that, In the raw materials for the second coating, the ratio of silver nanowires to ethanol is 0.9 mg / mL to 1.1 mg / mL.

4. The electroheating coating structure as described in any one of claims 1 to 3, characterized in that, The raw materials for the third coating include 4 to 6 parts by weight of modified hydrophobic epoxy resin, 1.0 to 1.5 parts by weight of polyetheramine, 25 to 35 parts by weight of ethanol, 25 to 35 parts by weight of ethyl acetate, and 0.4 to 0.6 parts by weight of heat-insulating filler.

5. The electroheating coating structure as described in claim 4, characterized in that, The heat insulation filler is at least one of hollow glass microspheres, expanded perlite, expanded vermiculite, and sepiolite.

6. The electroheating coating structure as described in claim 4, characterized in that, The particle size of the thermal insulation filler is 10 micrometers to 30 micrometers.

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