Super-hydrophobic coating for anti-icing of aluminum conductor as well as preparation method and application of super-hydrophobic coating

Abstract

The invention relates to an anti-icing super-hydrophobic coating for an aluminum conductor as well as a preparation method and application of the anti-icing super-hydrophobic coating. Single-ended epoxy fluorosilicone oil is grafted to the surface of an amino-functionalized metal organic framework material through an epoxy-amino ring-opening reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material has a flexible fluorocarbon chain shell, and according to the design, the mechanical strength of a coating is enhanced through a rigid framework of MOFs; the stress concentration is relieved by utilizing the flexibility of a molecular chain of the fluorosilicone oil. The modified metal organic framework material is further dispersed in a matrix composed of fluorine-containing epoxy resin and an amino fluorosilicone oil curing agent, a multi-layer micro-nano structure is formed through ultrasonic dispersion and spraying curing processes, and the super-hydrophobic coating is obtained. According to the coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 155 degrees, the rolling angle is smaller than or equal to 4 degrees, the ice adhesion strength is smaller than or equal to 40 kPa, and the wear resistance is excellent is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of super-hydrophobic materials, in particular to a super-hydrophobic coating for preventing ice on aluminum wires and a preparation method and application thereof. BACKGROUND

[0002] Ice accretion on power transmission lines is one of the most serious threats to the safety and stability of power grids. In particular, the overload or uneven load caused by ice accretion on aluminum transmission lines has led to many accidents, such as conductor galloping, wire disconnection, and tower collapse. To date, a large number of studies have been conducted to develop anti-icing strategies to mitigate the damage caused by ice accretion on aluminum transmission lines. Traditional anti-icing and de-icing technologies, such as mechanical scraping, chemical ice melting, and Joule heat ice melting, generally have high energy consumption, low efficiency, and poor environmental compatibility. For example, electric heating de-icing requires continuous consumption of a large amount of electricity, and chemical de-icing agents can pollute soil and water sources.

[0003] Super-hydrophobic coatings are considered the most promising anti-icing means because they can achieve passive anti-icing by repelling water droplets, delaying ice formation, and reducing ice adhesion. Theoretical studies have shown that when the ice adhesion strength is less than 60 kPa, natural wind or slight vibration can cause the ice layer to spontaneously detach, thereby significantly reducing de-icing energy consumption.

[0004] However, existing super-hydrophobic coatings face severe challenges in practical applications: insufficient mechanical durability: super-hydrophobic coatings rely on micro-nano rough structures (such as nanoparticles and micropillar arrays) that are easily damaged by rain erosion, wind and sand abrasion, or freeze-thaw cycles, leading to structural collapse and loss of hydrophobicity; lack of long-term effectiveness: excellent hydrophobicity (contact angle > 150°) in laboratory environments, but performance rapidly deteriorates in harsh outdoor environments (such as UV aging and temperature shock), making it difficult to meet the decades-long service life requirements of transmission lines; single functionality: most coatings only focus on initial hydrophobicity, ignoring the coordinated design of low ice adhesion strength and wear resistance, resulting in ice adhesion force still higher than the critical threshold (60 kPa).

[0005] In recent years, metal-organic framework materials (MOFs) have been tried to enhance the mechanical strength of coatings due to their high specific surface area, adjustable pore structure, and easy functionalization of the surface. Chinese patent CN115895397A discloses a photo-thermal super-hydrophobic multifunctional coating based on ferrocene metal-organic framework and a preparation method thereof. Although the patent uses amino-functionalized MOFs (UiO-66-NH2), the MOFs are not hydrophobized (such as fluorosilane grafting), and rely on hydrophobic silica fillers to provide water resistance, which cannot construct super-hydrophobic micro-nano structures.

[0006] Therefore, developing a coating with super-hydrophobicity, low ice adhesion, and high mechanical durability is a key breakthrough direction to solve the problem of preventing ice on aluminum transmission lines. SUMMARY

[0007] The present application aims to provide an ice-preventing super-hydrophobic coating for aluminum wires, a preparation method and application thereof. The present application grafts single-end epoxy fluorosilicone oil onto the surface of amino-functionalized metal organic framework material through epoxy-amino ring-opening reaction to obtain hydrophobically modified metal organic framework material, which has a flexible fluorocarbon chain shell. The design not only enhances the mechanical strength of the coating through the rigid framework of MOFs, but also relieves stress concentration by the flexibility of the molecular chain of fluorosilicone oil. Further, the modified metal organic framework material is dispersed in a matrix composed of fluorine-containing epoxy resin and amino fluorosilicone oil curing agent, and a multi-level micro-nano structure is formed through ultrasonic dispersion and spray curing process to obtain a super-hydrophobic coating. Experiments show that the coating still maintains a contact angle greater than 150° after 200 sandpaper rubs, and the ice adhesion strength is still less than 40 kPa. Therefore, the coating realizes excellent performance of static water contact angle ≥155°, rolling angle ≤4°, ice adhesion strength ≤40 kPa and excellent wear resistance through the synergistic effect of fluorosilane grafting modification and micro-nano structure. It is particularly suitable for long-term ice-preventing protection of aluminum wires and other harsh working conditions of power transmission lines.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] A super-hydrophobic coating for ice-preventing aluminum wires, comprising 20-40 parts by mass of fluorine-containing epoxy resin and 8-40 parts by mass of modified metal organic framework material,

[0010] The modified metal organic framework material is obtained by grafting single-end epoxy fluorosilicone oil onto the surface of amino-functionalized metal organic framework material.

[0011] Further, the super-hydrophobic coating further comprises a curing agent, and the mass fraction of the curing agent is 10-20 parts by mass.

[0012] Further, the super-hydrophobic coating further comprises a curing agent, and the mass fraction of the curing agent is 10-20 parts by mass.

[0013] Further, the super-hydrophobic coating has a static water contact angle ≥160°, a rolling angle ≤4° and an ice adhesion strength ≤40 kPa.

[0014] The present application also provides a preparation method of a super-hydrophobic coating for ice-preventing aluminum wires, and the specific steps are as follows:

[0015] S1, grafting single-end epoxy fluorosilicone oil onto the surface of amino-functionalized metal organic framework material through epoxy-amino ring-opening reaction to obtain modified metal organic framework material;

[0016] S2, dispersing the modified metal organic framework material obtained in step S1 in an organic solvent to obtain a suspension A;

[0017] S3, polycondensation reaction of hexafluorobisphenol A and epoxy bromopropane as reaction monomers to obtain fluorine-containing epoxy resin;

[0018] S4, dissolving the fluorine-containing epoxy resin obtained in step S3 and amino fluorosilicone oil curing agent in an organic solvent to obtain a mixed solution;

[0019] S5, mixing the mixed solution obtained in step S4 and the suspension A obtained in step S2, and forming a uniformly dispersed suspension B after ultrasonic dispersion treatment;

[0020] S6, spraying the suspension B obtained in step S5 on the surface of the substrate, and obtaining a super-hydrophobic coating after curing treatment.

[0021] Further, in step S1, the amino-functionalized metal-organic framework material is selected from any one of NH2-MIL-125(Ti), NH2-UiO-66(Zr), NH2-MIL-101(Fe) or NH2-MIL-53(Al).

[0022] Further, in step S1, the weight average molecular weight of the single-end epoxy group fluorosilicone oil is 1000-4000.

[0023] Further, in step S1, the mass ratio of the single-end epoxy group fluorosilicone oil to the amino-functionalized metal-organic framework material is 0.25-1:1.

[0024] Further, in step S1, the solvent of the ring-opening reaction is selected from tetrahydrofuran or N,N-dimethylformamide, the temperature of the ring-opening reaction is 20-40℃, and the time of the ring-opening reaction is 4-12h.

[0025] Further, in step S2, the mass ratio of the modified metal-organic framework material to the organic solvent is 8-40 parts:100 parts.

[0026] Further, in step S3, the mass ratio of the two reaction monomers of hexafluorobisphenol A and epoxy bromopropane is 1:2-10.

[0027] Further, in step S3, the catalyst of the polycondensation reaction is potassium hydroxide aqueous solution, and the mass percentage concentration of the potassium hydroxide aqueous solution is 20%-30%, preferably 25%;

[0028] The mass of the catalyst is 25%-45% of the total mass of the two reaction monomers.

[0029] Further, in step S3, the solvent of the polycondensation reaction is toluene, the temperature of the polycondensation reaction is 50-70℃, and the time of the polycondensation reaction is 3-6h.

[0030] Further, in step S4, the mass ratio of the fluorine-containing epoxy resin, the amino fluorosilicone oil curing agent and the organic solvent is 20-40 parts: 10-20 parts: 100 parts.

[0031] Further, in step S4, the weight average molecular weight of the amino fluorosilicone oil curing agent is 300-1000.

[0032] Further, the organic solvents in step S2 and step S4 are the same and are selected from any one of butyl acetate, anhydrous ethanol or tetrahydrofuran.

[0033] Further, in step S5, the mass ratio of the mixed solution obtained in step S4 and the suspension A obtained in step S2 is 1:1, preferably 100 parts: 100 parts.

[0034] Further, in step S5, the ultrasonic dispersion treatment time is 20-40 min.

[0035] Further, in step S6, the spraying amount is 100-300 ml / m 2 , preferably 200 ml / m 2 .

[0036] Further, in step S6, the substrate is aluminum material.

[0037] Further, in step S6, the curing temperature is 20-80℃ and the curing time is 4-24 h.

[0038] In addition, the application also provides an application of the super-hydrophobic coating for preventing ice on aluminum wires in a power transmission line aluminum wire, which is used for long-time ice prevention in the power transmission line aluminum wire.

[0039] Compared with the prior art, the application has the following beneficial effects:

[0040] (1) The super-hydrophobic coating for preventing ice on aluminum wires and the preparation method thereof designed in the application have fewer types of raw materials and low prices, and the formula is simple, which discards the expensive nano materials and complex additive systems relied on in the traditional method, significantly reduces the raw material cost. At the same time, the raw material processing technology of the application is simple, the production difficulty is low, the preparation process does not need complex equipment or process control, further reduces the equipment investment and energy consumption cost, and is convenient for large-scale production.

[0041] (2) The super-hydrophobic coating for preventing ice on aluminum wires in the application grafts the single-end epoxy fluorosilicone oil on the surface of the amino-functionalized metal organic framework material through the ring-opening reaction of amino and epoxy groups, which endows the coating with excellent micro / nano structure and low surface energy characteristics, the static water contact angle is ≥155°, the rolling angle is ≤4°, and excellent super-hydrophobic performance is shown.

[0042] (3) The super-hydrophobic coating for ice prevention of aluminum conductor of the present application has very low ice adhesion strength (≤40 kPa), which can effectively reduce the adhesion between the ice layer and the coating, thereby reducing the ice layer accumulation and preventing the damage of the ice layer to the substrate. This feature is particularly suitable for the ice prevention needs of the aluminum conductor of the power transmission line, which can significantly prolong the service life of the power transmission line and improve its operation stability.

[0043] (4) Compared with the prior art, the present application realizes the multifunctional integration of low ice adhesion, super-hydrophobicity, wear resistance, etc. by optimizing the coating composition and structure. The modified metal organic framework material accounts for 11% to 57% of the mass of the coating, which ensures the mechanical strength and durability of the coating, and the introduction of fluorine-containing epoxy resin and amino fluorosilicone oil curing agent further enhances the hydrophobicity and ice resistance of the coating.

[0044] (5) Compared with the traditional ice prevention coating, the present application uses metal organic framework material functionalization modification strategy to significantly reduce the ice adhesion while maintaining the mechanical stability of the coating, and the spraying process can realize uniform film formation on the surface of the substrate such as aluminum conductor. The coating is particularly suitable for ice prevention protection of the aluminum conductor of the power transmission line, and has long-term anti-icing and low ice adhesion characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 SEM image of the surface of the super-hydrophobic coating for ice prevention of aluminum conductor prepared in Example 1 of the present application;

[0046] Figure 2 Contact angle test picture of the super-hydrophobic coating for ice prevention of aluminum conductor prepared in Example 1 of the present application;

[0047] Figure 3 Contact angle test picture of the coating prepared in Comparative Example 1 of the present application.

[0048] Figure 4 Contact angle test picture of the coating prepared in Comparative Example 2 of the present application. DETAILED DESCRIPTION

[0049] The present application will be described in detail below in conjunction with the drawings and specific examples. The present embodiment is implemented on the premise of the technical solution of the present application, and gives detailed implementation mode and specific operation process, but the protection scope of the present application is not limited to the following examples.

[0050] In the following examples, if there is no special description of raw materials or processing technology, it means that they are all conventional commercially available raw material products or conventional processing technologies in the art.

[0051] Some embodiments of the present application will be described in detail with reference to the drawings. The following examples and features in the examples can be combined with each other without conflict.

[0052] Example 1

[0053] The present embodiment provides a preparation method of an ice-repellent super-hydrophobic coating for aluminum wires, and the specific steps are as follows:

[0054] S1, 25g of single-end epoxy-based fluorosilicone oil (weight average molecular weight 1000) and 100g of NH2-MIL-125(Ti) are dissolved in 400g of tetrahydrofuran solution, stirred at 25℃ for 5h, centrifuged and dried to obtain a modified metal organic framework material;

[0055] S2, 40g of the modified metal organic framework material obtained in step S1 is dispersed in 100g of tetrahydrofuran to obtain a suspension A;

[0056] S3, 15g of hexafluorobisphenol A and 30g of epoxy bromopropane are added to 100ml of toluene solvent at 70℃, stirred for 30min, and then 11.25g of 25% potassium hydroxide aqueous solution is slowly added, stirred at 60℃ for 4h, and then the solvent is evaporated by rotary evaporation at 60℃ for 20min to obtain a fluorine-containing epoxy resin;

[0057] S4, 30g of the fluorine-containing epoxy resin obtained in step S3 and 10g of amino fluorosilicone oil (weight average molecular weight 300) are dissolved in 100g of tetrahydrofuran to obtain a mixed solution;

[0058] S5, all the mixed solutions obtained in step S4 and all the suspensions A obtained in step S2 are mixed, and after ultrasonic dispersion treatment for 30min, a uniformly dispersed suspension B is formed;

[0059] S6, the suspension B obtained in step S5 is sprayed on the surface of the aluminum material at a speed of 200ml / m 2 Spray, place it in a 40℃ oven for 12h to cure, and obtain an ice-repellent super-hydrophobic coating for aluminum wires.

[0060] Example 2

[0061] The present embodiment provides a preparation method of an ice-repellent super-hydrophobic coating for aluminum wires, and the specific steps are as follows:

[0062] S1, 100g of single-end epoxy-based fluorosilicone oil (weight average molecular weight 3000) and 100g of NH2-UiO-66(Zr) are dissolved in 400g of tetrahydrofuran solution, stirred at 30℃ for 5h, centrifuged and dried to obtain a modified metal organic framework material;

[0063] S2, 30 g of the modified metal-organic framework material obtained in step S1 was dispersed in 100 g of tetrahydrofuran to obtain a suspension A;

[0064] S3, 10 g of hexafluorobisphenol A and 100 g of epoxy bromopropane were added to 100 ml of toluene solvent at 70°C, stirred for 30 min, and then 49.5 g of 25% potassium hydroxide aqueous solution was slowly added dropwise, and stirred at 50°C for 6 h. After the solvent was evaporated by rotary evaporation at 60°C for 20 min, a fluorine-containing epoxy resin was obtained;

[0065] S4, 20 g of the fluorine-containing epoxy resin obtained in step S3 and 10 g of amino fluorosilicone oil (weight average molecular weight 500) were dissolved in 100 g of tetrahydrofuran to obtain a mixed solution;

[0066] S5, all the mixed solution obtained in step S4 and all the suspension A obtained in step S2 were mixed, and after ultrasonic dispersion treatment for 30 min, a uniformly dispersed suspension B was formed;

[0067] S6, the suspension B obtained in step S5 was sprayed on the surface of aluminum material at a speed of 200 ml / m 2 The aluminum material was placed in a 40°C oven for 12 h to cure, and an ultra-hydrophobic coating for ice prevention of aluminum wire was prepared.

[0068] Example 3

[0069] The present embodiment provides a preparation method of an ultra-hydrophobic coating for ice prevention of aluminum wire, and the specific steps are as follows:

[0070] S1, 50 g of single-end epoxy group fluorosilicone oil (weight average molecular weight 4000) and 100 g of NH2-MIL-125(Ti) were dissolved in 400 g of tetrahydrofuran solution, and stirred at 30°C for 5 h. After centrifugal drying, a modified metal-organic framework material was obtained;

[0071] S2, 20 g of the modified metal-organic framework material obtained in step S1 was dispersed in 100 g of tetrahydrofuran to obtain a suspension A;

[0072] S3, 10 g of hexafluorobisphenol A and 50 g of epoxy bromopropane were added to 100 ml of toluene solvent at 70°C, stirred for 30 min, and then 18 g of 25% potassium hydroxide aqueous solution was slowly added dropwise, and stirred at 70°C for 3 h. After the solvent was evaporated by rotary evaporation at 60°C for 20 min, a fluorine-containing epoxy resin was obtained;

[0073] S4, dissolve 20 g of the fluorine-containing epoxy resin obtained in step S3 and 10 g of amino fluorosilicone oil (weight average molecular weight of 1000) in 100 g of tetrahydrofuran to obtain a mixed solution;

[0074] S5, mix all the mixed solution obtained in step S4 and all the suspension A obtained in step S2, and form a uniformly dispersed suspension B after ultrasonic dispersion treatment for 30 min;

[0075] S6, spray 200 ml / m2of the suspension B obtained in step S5 on the surface of the aluminum material by using a spraying process, and place the aluminum material in an oven at 80°C for 2 h to cure and form an ultrahydrophobic coating for preventing ice on the aluminum wire. 2 Spray on the surface of the aluminum material and place it in an oven at 80°C for 2 h to cure and form an ultrahydrophobic coating for preventing ice on the aluminum wire.

[0076] Example 4

[0077] The present example provides a preparation method of an ultrahydrophobic coating for preventing ice on the aluminum wire, wherein NH2-MIL-125(Ti) is replaced by NH2-MIL-101(Fe), and the remaining steps are the same as those in Example 1.

[0078] Example 5

[0079] The present example provides a preparation method of an ultrahydrophobic coating for preventing ice on the aluminum wire, wherein NH2-UiO-66(Zr) is replaced by NH2-MIL-53(Al), and the remaining steps are the same as those in Example 2.

[0080] Comparative Example 1

[0081] The present example provides a coating, and the specific steps are as follows:

[0082] S1, disperse 40 g of metal organic framework material NH2-MIL-125(Ti) in 100 g of tetrahydrofuran to obtain a suspension A;

[0083] S2, add 15 g of hexafluorobisphenol A and 30 g of epoxy bromopropane to 100 ml of toluene solvent at 70°C, stir for 30 min, and then slowly drop 11.25 g of 25% potassium hydroxide aqueous solution into the system, stir at 60°C for 4 h, and then evaporate the solvent by rotary evaporation at 60°C for 20 min to obtain a fluorine-containing epoxy resin;

[0084] S3, dissolve 30 g of the fluorine-containing epoxy resin obtained in step S2 and 10 g of amino fluorosilicone oil (weight average molecular weight of 300) in 100 g of tetrahydrofuran to obtain a mixed solution;

[0085] S4, mix the mixed solution obtained in step S3 and the suspension A obtained in step S1, and form a uniformly dispersed suspension B after ultrasonic dispersion treatment for 30 min;

[0086] S5, the suspension B obtained in step S4 is sprayed on the surface of the aluminum material at a speed of 200 ml / m2, and the aluminum material is placed in an oven at 40°C for 12 h to heat and cure, thereby obtaining the super-hydrophobic coating for preventing ice on the aluminum wire. 2

[0087] Comparative Example 2

[0088] The present comparative example provides a coating, and the specific steps are as follows:

[0089] S1, 35 ml of dodecyl glycidyl ether and 100 g of NH2-MIL-125(Ti) are dissolved in 400 g of tetrahydrofuran solution, and the reaction is stirred at 50°C for 8 h, centrifuged and dried to obtain a modified metal organic framework material;

[0090] S2, 20 g of the modified metal organic framework material obtained in step S1 is dispersed in 100 g of tetrahydrofuran to obtain a suspension A;

[0091] S3, 10 g of hexafluorobisphenol A and 50 g of epoxy bromopropane are added to 100 ml of toluene solvent at 70°C, and stirred for 30 min. After the system is uniformly dispersed, 18 g of 25% potassium hydroxide aqueous solution is slowly added dropwise, and stirred at 70°C for 3 h. After the solvent is evaporated by rotary evaporation at 60°C for 20 min, a fluorine-containing epoxy resin is obtained;

[0092] S4, 20 g of the fluorine-containing epoxy resin obtained in step S3 and 10 g of amino fluorosilicone oil (weight average molecular weight of 1000) are dissolved in 100 g of tetrahydrofuran to obtain a mixed solution;

[0093] S5, the mixed solution obtained in step S4 and the suspension A obtained in step S2 are mixed, and after ultrasonic dispersion treatment for 30 min, a uniformly dispersed suspension B is formed;

[0094] S6, the suspension B obtained in step S5 is sprayed on the surface of the aluminum material at a speed of 200 ml / m2, and the aluminum material is placed in an oven at 80°C for 2 h to heat and cure, thereby obtaining the super-hydrophobic coating for preventing ice on the aluminum wire. 2

[0095] In order to illustrate the effect of the super-hydrophobic coating for preventing ice on the aluminum wire provided by the present application, the following tests are performed:

[0096] (1) Surface morphology test

[0097] The super-hydrophobic coating for preventing ice on the aluminum wire prepared in Example 1 is subjected to surface morphology test by Zeiss SUPRA-55 field reflection scanning electron microscope (SEM), and the surface morphology diagram of the coating obtained is as shown in Figure 1 ​​as shown.

[0098] (2) Hydrophobicity test

[0099] The water contact angle and the rolling angle of the coating were measured by a DSA100 contact angle measuring instrument. The contact angle test pictures of the super-hydrophobic coating for anti-icing of aluminum wire prepared by Example 1 are shown in Figure 2 , the contact angle test pictures of the coating prepared by Comparative Examples 1-2 are shown in Figure 3 and Figure 4 , and the contact angle test results of the super-hydrophobic coating for anti-icing of aluminum wire prepared by Examples 1-5 and the coating prepared by Comparative Examples 1-2 are shown in Table 1.

[0100] (3) Ice adhesion strength

[0101] Under the environment of -10℃, the deionized water in the hollow polytetrafluoroethylene mold was frozen, and after the ice column was formed, a 0℃ deionized water film was applied to the surface of the ice column. The water film interface was combined with the coating test plate, and after being frozen at -10℃ for 4h, the shear force test device was used to measure the shear force of the ice column and the test plate separation. According to the shear force and the cross-sectional area of the ice column, the ice adhesion strength was calculated. The ice adhesion strength test results of the super-hydrophobic coating for anti-icing of aluminum wire prepared by Examples 1-5 and the coating prepared by Comparative Examples 1-2 are shown in Table 1.

[0102] (4) Ice accumulation test

[0103] Under the same icing conditions of -10℃, the ice accumulation was compared with the blank aluminum plate. The ice adhesion strength test results of the super-hydrophobic coating for anti-icing of aluminum wire prepared by Examples 1-5 and the coating prepared by Comparative Examples 1-2 are shown in Table 1.

[0104] (5) Mechanical property test

[0105] The adhesion of the coating was measured according to GB / T 9286-1998 “Cross-hatch test of paint film for pigmented and clear coatings”. The adhesion test results of the super-hydrophobic coating for anti-icing of aluminum wire prepared by Examples 1-5 and the coating prepared by Comparative Examples 1-2 are shown in Table 1.

[0106] One side of the coating of the aluminum plate was placed on the surface of 1000 mesh sandpaper, and a 100g weight was placed on the test plate. The test plate was moved at a rate of 10cm / s for 20cm as one polishing cycle. After 200 polishing cycles, the mechanical stability of the coating was evaluated by measuring the attenuation of the water contact angle, the rolling angle and the ice adhesion strength of the coating.

[0107] (6) Ice adhesion strength test under freeze-thaw cycle

[0108] The deionized water in the hollow polytetrafluoroethylene mold was frozen, and after the ice column was formed, the surface was coated with a 0°C deionized water film. The water film interface was combined with the coated test plate, and after being frozen at -10°C for 4h, the shear force test device was used to measure the shear force of the ice column and the test plate. According to the shear force and the cross-sectional area of the ice column, the ice adhesion strength was calculated. The ice adhesion strength value after 100 freeze-thaw cycles was recorded.

[0109] (7) Outdoor weather resistance test

[0110] The coating was hung at an angle of 45° south in the outdoor environment of Beijing to test its long-term outdoor weather resistance. After 1000h, the contact angle of the coating was measured.

[0111] Table 1 Performance data of the super-hydrophobic coating for aluminum wire ice prevention prepared by Examples 1-5 and the coating prepared by Comparative Examples 1-2

[0112]

[0113]

[0114] According to Figure 1 It can be seen that the surface of the super-hydrophobic coating for aluminum wire ice prevention prepared by Example 1 has obvious micro-nano secondary rough structure, which is the key to the super-hydrophobic performance of the coating. By comparison Figure 2 and Figure 3 It can be seen that the contact angle of the coating prepared by Comparative Example 1 is smaller than that of the super-hydrophobic coating for aluminum wire ice prevention prepared by Example 1, so the super-hydrophobic coating for aluminum wire ice prevention prepared by Example 1 exhibits obvious super-hydrophobicity.

[0115] As can be seen from Table 1, the water contact angle of the super-hydrophobic coating for preventing ice on aluminum conductor prepared from Examples 1-5 is greater than 160°, the rolling angle is less than 3°, the adhesion is 1 level, the ice adhesion strength is very low (<15 kPa), the ice adhesion strength is still very low (<20 kPa) after 200 times of polishing, the ice adhesion strength is less than 25 kPa after 100 times of freeze-thaw cycles, the contact angle is still greater than 155° after 1000 hours of outdoor irradiation, while the water contact angle of the coating prepared from Comparative Examples 1-2 is less than 156°, the rolling angle is greater than 5°, and the ice adhesion strength is high (>70 kPa), the ice adhesion strength is >160 kPa after 200 times of polishing, the ice adhesion strength is greater than 200 kPa after 100 times of freeze-thaw cycles, and the contact angle is less than 120° after 1000 hours of outdoor irradiation. Therefore, the super-hydrophobic coating for preventing ice on aluminum conductor has the characteristics of super-hydrophobic, fast ice melting, wear resistance, reducing ice adhesion strength, and reducing ice amount, and the super-hydrophobic coating for preventing ice on aluminum conductor prepared from Examples 1-5 has good anti-icing function, so that the aluminum conductor using the coating has the function of preventing ice.

[0116] The above description of the examples is for the purpose of enabling a person of ordinary skill in the art to understand and use the application. Those skilled in the art can easily make various modifications to the examples and apply the general principles described herein to other examples without inventive labor. Therefore, the application is not limited to the above examples, and improvements and modifications made by those skilled in the art based on the disclosure of the application without departing from the scope of the application should be within the scope of the application.

Claims

1. A superhydrophobic coating for ice prevention on aluminum wires, characterized in that, The fluorine-containing epoxy resin comprises 20-40 parts by mass and the modified metal organic framework material comprises 8-40 parts by mass. The modified metal organic framework material is obtained by grafting the single-end epoxy group fluorosilicone oil onto the surface of the amino-functionalized metal organic framework material.

2. The superhydrophobic coating for ice prevention on aluminum wires according to claim 1, characterized in that, The curing agent in the super-hydrophobic coating is 10-20 parts by mass. The curing agent is amino-fluorosilicone oil.

3. The superhydrophobic coating for ice prevention on aluminum wires according to claim 1, characterized in that, The static water contact angle of the super-hydrophobic coating is greater than or equal to 160°, the rolling angle is less than or equal to 4°, and the ice adhesion strength is less than or equal to 40 kPa.

4. A method for preparing the superhydrophobic coating for ice prevention on aluminum wires according to any one of claims 1-3, characterized in that, The specific steps are as follows: S1, the single-end epoxy group fluorosilicone oil is grafted onto the surface of the amino-functionalized metal organic framework material by ring-opening reaction of epoxy group and amino group to obtain the modified metal organic framework material; S2, the modified metal organic framework material obtained in step S1 is dispersed in an organic solvent to obtain a suspension A; S3, hexafluorobisphenol A and epoxy bromopropane are used as reaction monomers to perform polycondensation reaction to obtain the fluorine-containing epoxy resin; S4, the fluorine-containing epoxy resin and amino-fluorosilicone oil curing agent obtained in step S3 are dissolved in an organic solvent to obtain a mixed solution; S5, the mixed solution obtained in step S4 and the suspension A obtained in step S2 are mixed, and after ultrasonic dispersion treatment, a uniformly dispersed suspension B is formed; S6, the suspension B obtained in step S5 is sprayed on the surface of a substrate, and after curing treatment, a super-hydrophobic coating is obtained.

5. The method according to claim 4, wherein the method is characterized by, In step S1, the amino-functionalized metal organic framework material is selected from any one of NH2-MIL-125(Ti), NH2-UiO-66(Zr), NH2-MIL-101(Fe) or NH2-MIL-53(Al); The weight average molecular weight of the single-end epoxy group fluorosilicone oil is 1000-4000; The mass ratio of the single-end epoxy group fluorosilicone oil to the amino-functionalized metal organic framework material is 0.25-1:1; The solvent of the ring-opening reaction is selected from tetrahydrofuran or N,N-dimethylformamide, the temperature of the ring-opening reaction is 20-40℃, and the time of the ring-opening reaction is 4-12 h.

6. The method of claim 4, wherein the method further comprises: In step S3, the mass ratio of the two reaction monomers of hexafluorobisphenol A and epoxy bromopropane is 1:2-10; The catalyst of the polycondensation reaction is potassium hydroxide aqueous solution, the mass percentage concentration of the potassium hydroxide aqueous solution is 20%-30%, the mass of the catalyst is 25%-45% of the total mass of the two reaction monomers, the solvent of the polycondensation reaction is toluene, the temperature of the polycondensation reaction is 50-70℃, and the time of the polycondensation reaction is 3-6 h. In step S2, the mass parts ratio of the modified metal organic framework material to the organic solvent is 8-40 parts:100 parts; In step S4, the mass parts ratio of the fluorine-containing epoxy resin, amino-fluorosilicone oil curing agent and organic solvent is 20-40 parts:10-20 parts:100 parts; 7. The method according to claim 4, wherein the method is characterized by, The weight average molecular weight of the amino-fluorosilicone oil curing agent is 300-1000; The organic solvents in steps S2 and S4 are the same and are selected from any one of butyl acetate, anhydrous ethanol or tetrahydrofuran. ​ ​ 8. The method of claim 4, wherein the method further comprises: The mass ratio of the mixed solution obtained in step S4 to the suspension A obtained in step S2 is 1:1 in step S5. The ultrasonic dispersion treatment is performed for 20-40 min.

9. The method of claim 4, wherein the method further comprises: In step S6, the amount of spraying is 100 to 300 ml / m 2 , The substrate is aluminum material. The curing is performed at 20-80°C for 4-24 h.

10. Use of the super-hydrophobic coating for anti-icing of aluminum wires according to any one of claims 1-3 in aluminum wires of power transmission lines.

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