Self-healing material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of functional material preparation, and particularly relates to a self-healing material and a preparation method and application thereof. The self-healing material has a specific structural formula, can automatically repair the damage of the ice-resistant coating at room temperature without external stimulation, and the repaired ice-resistant coating still has high mechanical strength and tensile property. A polymer chain in the self-healing material spontaneously forms a dynamic supramolecular polymer, strong hydrogen bond interaction force and weak hydrogen bond interaction force exist in a polymer chain segment, a composite hydrogen bond network is formed, the hydrogen bond density is remarkably improved, the number of hydrogen bond donors or acceptors is increased, the hydrogen bonds can be self-healed after being damaged due to reversibility of the hydrogen bonds, and the self-healing effect is good. The repairing efficiency and the self-healing capability are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional material preparation, and particularly relates to a self-healing material and a preparation method and application thereof. BACKGROUND

[0002] Excellent anti-icing coatings can achieve anti-icing effect by reducing ice nucleation, inhibiting ice crystal diffusion or reducing adhesion between ice and device surface, but their surfaces are easily damaged by external environment during long-term use, thereby losing anti-icing performance. At present, it is conceived that the anti-icing coating has a self-healing function, which can effectively prolong the service life of the coating and achieve long-term anti-icing effect.

[0003] However, there are few reports on self-healing anti-icing coatings, which may be due to the fact that most self-healing materials need external energy such as input light, heat and magnetism to realize self-healing, thereby limiting the application of self-healing anti-icing coatings. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a self-healing material and a preparation method and application thereof.

[0005] In a first aspect, the present application provides a self-healing material, which has the following structural formula:

[0006] Among them, R1 includes at least one of , , , , ; R2 is selected from ; n is 40-70.

[0007] In a second aspect, the present application provides a self-healing material, raw materials of the self-healing material including: polydimethylsiloxane containing end-capping groups, a crosslinking agent, a first hydrogen bond compound, a second hydrogen bond compound; The first hydrogen bond compound includes at least one or more of 4,4'-diamino diphenyl ether, 3,4'-diamino diphenyl ether, 1,3-bis(4'-aminophenoxy) benzene, 4,4'-diamino benzophenone or 4,4'-diamino diphenyl sulfide; The second hydrogen bond compound includes 2,4-diamino-1,3,5-triazine.

[0008] In an alternative embodiment, the molar ratio of the end-capped polydimethylsiloxane, the cross-linking agent, the first hydrogen-bonding compound, and the second hydrogen-bonding compound is 1:1:(0-0.66):(0-0.66), none of which is 0.

[0009] In an alternative embodiment, the molar ratio of the end-capped polydimethylsiloxane, the cross-linking agent, the first hydrogen-bonding compound, and the second hydrogen-bonding compound is 1:1:(0.3-0.66):(0.3-0.66).

[0010] In an alternative embodiment, the end-capping group comprises an aminopropyl group; preferably, the end-capped polydimethylsiloxane is bis(3-aminopropyl)-capped polydimethylsiloxane. In an alternative embodiment, the end-capped polydimethylsiloxane has a molecular weight of 3000-5000 g / mol. In an alternative embodiment, the cross-linking agent comprises at least one or more of toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, or isophorone diisocyanate.

[0011] In a third aspect, the present application provides a method for preparing the self-healing material described above, comprising the following steps: (1) reacting the end-capped polydimethylsiloxane with the cross-linking agent to obtain a prepolymer; (2) adding the first hydrogen-bonding compound and the second hydrogen-bonding compound to the prepolymer, and reacting to obtain a reaction product, which is then post-treated and dried.

[0012] In an alternative embodiment, in the step (1), the reaction is carried out at a temperature of 20-30 °C for 18-24 h.

[0013] In an alternative embodiment, in the step (2), the reaction is carried out at a temperature of 60-80 °C for 15-20 h.

[0014] In an alternative embodiment, the post-treatment comprises standing after adding an alcohol solvent to the reaction product, and dilution. Preferably, the alcohol solvent comprises methanol and / or ethanol.

[0015] In a fourth aspect, the present application provides an anti-icing coating comprising the self-healing material described above.

[0016] Compared with the prior art, the technical scheme provided by the embodiments of the present application has the following advantages: 1. The self-healing material provided by the present application has a specific structural formula, can autonomously repair damage to the ice-resistant coating under room temperature conditions without external stimulation, and the repaired ice-resistant coating still has strong mechanical strength and tensile properties. The polymer chains in the self-healing material of the present application spontaneously form dynamic supramolecular polymers, and there are strong hydrogen bond interaction forces and weak hydrogen bond interactions in the polymer chain segments, forming a complex hydrogen bond network that significantly increases the hydrogen bond density, which is conducive to increasing the number of hydrogen bond donors or acceptors. The reversibility of hydrogen bonds enables them to self-heal after being damaged, improving repair efficiency and self-healing ability.

[0017] 2. The self-healing material provided by the present application has a specific structural formula, can autonomously repair damage to the ice-resistant coating under room temperature conditions without external stimulation, and the repaired ice-resistant coating still has strong mechanical strength and tensile properties. The polymer chains in the self-healing material of the present application spontaneously form dynamic supramolecular polymers, and there are strong hydrogen bond interaction forces and weak hydrogen bond interactions in the polymer chain segments, forming a complex hydrogen bond network that significantly increases the hydrogen bond density, which is conducive to increasing the number of hydrogen bond donors or acceptors. The reversibility of hydrogen bonds enables them to self-heal after being damaged, improving repair efficiency and self-healing ability. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the solutions of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the examples in the specification are only some of the embodiments of the present application, not all the embodiments.

[0020] In the first aspect, the embodiments of the present application provide a self-healing material, which has the following structural formula:

[0021] The self-healing material provided by the present application can autonomously repair the damage of the ice-resistant coating at room temperature without external stimulation, and the repaired ice-resistant coating still has strong mechanical strength and tensile properties. The polymer chains in the self-healing material spontaneously form dynamic supramolecular polymers, and there are strong hydrogen bond interaction forces and weak hydrogen bond interactions in the polymer chain segments, forming a complex hydrogen bond network, which significantly increases the hydrogen bond density, is conducive to increasing the number of hydrogen bond donors or acceptors, and the reversibility of the hydrogen bond enables it to self-heal after being damaged, improving the repair efficiency and self-healing ability. On the one hand, the interaction between strong hydrogen bonds enables the self-healing material to have high strength, high elasticity and self-healing recovery; the interaction between weak hydrogen bonds dissipates strain energy through the breaking and reforming of effective reversible bonds, improving the self-healing ability and wear resistance. On the other hand, the hydrogen bonds formed between the carbonyl, urea, amino, hydroxyl and other groups in the self-healing material constitute a dynamic and reversible hydrogen bond network, which competes with water molecules for hydrogen bonding, effectively disrupting the process of water molecules arranging regularly to form ice crystals, delaying the formation and growth of ice nuclei, destroying the transformation of liquid water into ice, slowing down the ice formation process, and improving the ice-resistant performance of the coating. At the same time, the self-healing property of the self-healing material enables the ice-resistant performance to be restored after long-term use or slight damage, realizing the unity of durability and functionality, and significantly improving the ice-resistant performance of the coating. Among them, the self-healing recovery refers to the fact that the mechanical properties of the coating do not decrease significantly after self-healing.

[0022] In a second aspect, the present application provides a self-healing material, raw materials of the self-healing material comprising: a polydimethylsiloxane containing a blocking group, a crosslinking agent, a first hydrogen bond compound, a second hydrogen bond compound; The first hydrogen bond compound comprises at least one or more of 4,4'-diamino diphenyl ether, 3,4'-diamino diphenyl ether, 1,3-bis(4'-aminophenoxy)benzene, 4,4'-diamino benzophenone or 4,4'-diamino diphenyl sulfide; the aminos in the first hydrogen bond compound form a weak hydrogen bond network, which is conducive to dissipating strain energy through the breaking and reforming of reversible bonds, improving wear resistance and self-healing performance.

[0023] The second hydrogen bond compound comprises 2,4-diamino-1,3,5-triazine; the aminos in the second hydrogen bond compound form a strong hydrogen bond network, which is conducive to improving the strength, elasticity and self-healing ability of the material. In addition, when competing with water molecules for hydrogen bonding, the strong hydrogen bond network has a binding advantage, which disrupts the regular arrangement of water molecules to form ice crystals, hinders the process of water forming ice, and is more conducive to improving the ice-resistant performance of the coating.

[0024] The raw materials of the self-healing material of the present application include the two hydrogen bond compounds described above, which can form a high-density hydrogen bond network inside the coating. On the one hand, the hydrogen bond density is significantly increased by the hydrogen bond complex network formed by the synergistic mode of multiple hydrogen bonds, thereby improving the self-healing performance of the coating. The reversibility of the hydrogen bond enables it to be reformed after being damaged. When the hydrogen bond is formed, the lone pair electron orbital is as much as possible to be frontally docked with the bonding orbital of D (such as oxygen atom O)-H bond, and the directionality ensures that the hydrogen bond can be accurately paired when it is reconnected, thereby improving the repair efficiency. On the other hand, the hydrogen bond network formed can hinder the transformation of liquid water into ice, thereby improving the ice resistance performance. The coating with self-healing ability can be restored after long-term use or slight damage, thereby further improving the ice resistance performance.

[0025] In an alternative embodiment, the molar ratio of the end-capped group-containing polydimethylsiloxane, the crosslinking agent, the first hydrogen bond compound, and the second hydrogen bond compound is 1:1:(0-0.66):(0-0.66), none of which is 0; preferably, the molar ratio of the end-capped group-containing polydimethylsiloxane, the crosslinking agent, the first hydrogen bond compound, and the second hydrogen bond compound is 1:1:(0.3-0.66):(0.3-0.66); as an example, the molar ratio is 1:1:0.3:0.3, 1:1:0.5:0.5, 1:1:0.5:0.66, 1:1:0.4:0.6, 1:1:0.6:0.45, or any ratio within the above range.

[0026] In an alternative embodiment, the end-capped group includes an aminopropyl group; preferably, the end-capped group-containing polydimethylsiloxane is bis(3-aminopropyl)-terminated polydimethylsiloxane. In an alternative embodiment, the molecular weight Mn of the end-capped group-containing polydimethylsiloxane is 3000-5000 g / mol.

[0027] In an alternative embodiment, the crosslinking agent includes at least one or more of toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, or isophorone diisocyanate.

[0028] In a third aspect, an embodiment of the present application provides a preparation method of the self-healing material described above, including the following steps: (1) The end-capped group-containing polydimethylsiloxane reacts with the crosslinking agent to obtain a prepolymer; (2) The first hydrogen bond compound and the second hydrogen bond compound are added to the prepolymer, and a reaction product is obtained after reaction, post-treatment, and drying.

[0029] In an alternative embodiment, the step (1), the temperature of the reaction is 20-30℃, and the time is 18-24h. By way of example, the temperature of the reaction includes 20℃, 25℃, 30℃, and the like, and preferably is room temperature.

[0030] In an alternative embodiment, the step (2), the temperature of the reaction is 60-80℃, and the time is 15-20h.

[0031] In an alternative embodiment, the post-treatment includes standing after adding an alcohol solvent to the reaction product, and dilution; optionally, the alcohol solvent includes methanol and / or ethanol. Specifically, 5 times the amount of alcohol solvent is added to the reaction product, and the product is allowed to stand and precipitate for 30 minutes, and then the product is diluted with a solvent, and the upper clear liquid is separated, and the self-healing material is obtained by drying at 30-90℃ under vacuum for 12-48h. The solvent includes at least one or more of ethanol, methanol, n-hexane, petroleum ether, dichloromethane, trichloromethane, ethyl acetate, tetrahydrofuran, N,N-dimethylformamide, or N,N-dimethylacetamide.

[0032] In an alternative embodiment, the method for preparing the self-healing material described above specifically includes the following steps: (1) The capped polydimethylsiloxane is dried to remove water, and then a crosslinking agent is dissolved in a solvent and added dropwise to the capped polydimethylsiloxane, and the reaction is carried out under nitrogen to obtain a prepolymer; optionally, the solvent includes at least one or more of ethanol, methanol, n-hexane, petroleum ether, dichloromethane, trichloromethane, ethyl acetate, tetrahydrofuran, N,N-dimethylformamide, or N,N-dimethylacetamide.

[0033] (2) The first hydrogen-bonding compound and the second hydrogen-bonding compound are added dropwise to the prepolymer described above, and the reaction is carried out to obtain a reaction product, 5 times the amount of an alcohol solvent is added to the reaction product, and the product is allowed to stand and precipitate for 30 minutes to obtain a viscous product, and then the product is diluted with a solvent, and the upper clear liquid is separated, and the self-healing material is obtained by drying at 30-90℃ under vacuum for 12-48h.

[0034] In a fourth aspect, the present application provides an anti-icing coating material, which includes the self-healing material described above.

[0035] The raw materials used in the following examples or comparative examples are conventional raw materials in the art, and are all commercially available.

[0036] Example 1 The present example provides a method for preparing a self-healing material, which includes the following steps: (1) 5g of bis(3-aminopropyl) capped polydimethylsiloxane (molecular weight 5000g / mol) is placed in a dry reactor, and the water is removed by drying at 100℃ under vacuum for 30 minutes.

[0037] The prepolymer was synthesized by dissolving 0.222 g of isophorone diisocyanate in 10 ml of anhydrous tetrahydrofuran and adding it dropwise to the above reactor, stirring at room temperature for 24 hours under nitrogen.

[0038] (2) At 80°C, 0.1 g of 4,4'-diamino diphenyl ether and 0.056 g of 2,4-diamino-1,3,5-triazine were dissolved in N,N-dimethylacetamide and added dropwise to the prepolymer, and after the end of the dropwise addition, stirring was performed for 15 hours to obtain a reaction product.

[0039] To the reaction product, methanol was added in an amount of five times the volume of the reaction product, and precipitation was performed by standing for 30 minutes to obtain a viscous yellowish product; after diluting the product with tetrahydrofuran, the mixture was placed in a mold, the upper clear solution was decanted, and vacuum drying was performed at 90°C for 12 hours to obtain a self-healing material.

[0040] Example 2 The present example provides a method for preparing a self-healing material, comprising the following steps: (1) 5 g of bis(3-aminopropyl)-terminated polydimethylsiloxane was placed in a dry reactor, and water was removed by drying at 100°C for 30 minutes under vacuum.

[0041] The prepolymer was synthesized by dissolving 0.222 g of isophorone diisocyanate in 10 ml of anhydrous tetrahydrofuran and adding it dropwise to the above reactor, stirring at room temperature for 24 hours under nitrogen.

[0042] (2) At 80°C, 0.067 g of 4,4'-diamino diphenyl ether and 0.074 g of 2,4-diamino-1,3,5-triazine were dissolved in N,N-dimethylacetamide and added dropwise to the prepolymer, and after the end of the dropwise addition, stirring was performed for 15 hours to obtain a reaction product.

[0043] To the reaction product, methanol was added in an amount of five times the volume of the reaction product, and precipitation was performed by standing for 30 minutes to obtain a viscous yellowish product; after diluting the product with tetrahydrofuran, the mixture was placed in a mold, the upper clear solution was decanted, and vacuum drying was performed at 90°C for 12 hours to obtain a self-healing material.

[0044] Example 3 The present example provides a method for preparing a self-healing material, comprising the following steps: (1) 5 g of bis(3-aminopropyl)-terminated polydimethylsiloxane was placed in a dry reactor, and water was removed by drying at 100°C for 30 minutes under vacuum.

[0045] The prepolymer was synthesized by dissolving 0.222 g of isophorone diisocyanate in 10 ml of anhydrous tetrahydrofuran and adding it dropwise to the above reactor, stirring at room temperature for 24 hours under nitrogen.

[0046] (2) 0.133 g of 4,4'-diaminodiphenyl ether and 0.037 g of 2,4-diamino-l,3,5-triazine were dissolved in N,N-dimethylacetamide at 80°C and added dropwise to the prepolymer, and the reaction product was obtained by stirring for 15 hours after the completion of the dropwise addition.

[0047] Methanol was added to the reaction product in an amount of five times the volume of the reaction product, and the mixture was left to stand to precipitate for 30 minutes, to obtain a viscous yellowish product; after diluting the product with tetrahydrofuran, the mixture was put into a mold, the upper clear solution was decanted, and the self-healing material was obtained by vacuum drying at 90°C for 12 hours.

[0048] Example 4 The present example provides a method for preparing a self-healing material, which is substantially the same as that of Example 1, except that 4,4'-diaminobenzophenone is used instead of 4,4'-diaminodiphenyl ether.

[0049] Example 5 The present example provides a method for preparing a self-healing material, which is substantially the same as that of Example 1, except that 4,4'-diaminodiphenyl sulfide is used instead of 4,4'-diaminodiphenyl ether.

[0050] Example 6 The present example provides a method for preparing a self-healing material, which is substantially the same as that of Example 1, except that 1,3-bis(4'-aminophenoxy)benzene is used instead of 4,4'-diaminodiphenyl ether.

[0051] Comparative Example 1 The present comparative example provides a method for preparing a self-healing material, which comprises the following steps: (1) 5 g of bis(3-aminopropyl)-terminated polydimethylsiloxane was placed in a dry reactor, and water was removed by drying at 100°C under vacuum conditions for 30 min.

[0052] 0.222 g of isophorone diisocyanate was dissolved in 10 ml of anhydrous tetrahydrofuran and added dropwise to the above reactor, and a prepolymer was synthesized by stirring at room temperature for 24 hours under nitrogen.

[0053] (2) 0.2 g of 4,4'-diaminodiphenyl ether was dissolved in N,N-dimethylacetamide at 80°C and added dropwise to the prepolymer, and the reaction product was obtained by stirring for 15 hours after the completion of the dropwise addition.

[0054] Methanol was added to the reaction product in an amount of five times the volume of the reaction product, and the mixture was left to stand to precipitate for 30 minutes, to obtain a viscous yellowish product; after diluting the product with tetrahydrofuran, the mixture was put into a mold, the upper clear solution was decanted, and the self-healing material was obtained by vacuum drying at 90°C for 12 hours.

[0055] Comparative Example 2 The present comparative example provides a preparation method of a self-healing material, comprising the following steps: (1) 5 g of bis(3-aminopropyl)-terminated polydimethylsiloxane was placed in a dry reactor, and dried at 100°C for 30 minutes under vacuum conditions to remove water.

[0056] 0.222 g of isophorone diisocyanate was dissolved in 10 ml of anhydrous tetrahydrofuran and added dropwise to the above reactor, and the prepolymer was synthesized by stirring at room temperature for 24 hours under nitrogen.

[0057] (2) At 80°C, 0.111 g of 2,4-diamino-1,3,5-triazine was dissolved in N,N-dimethylacetamide and added dropwise to the prepolymer, and after the addition was completed, the reaction product was obtained by stirring for 15 hours.

[0058] Methanol was added to the reaction product in an amount of five times the volume of the reaction product, and the product was precipitated by standing for 30 minutes to obtain a viscous light yellow product; after diluting the product with tetrahydrofuran, the mixture was placed in a mold, the upper clear solution was decanted, and the self-healing material was obtained by vacuum drying at 90°C for 12 hours.

[0059] Test Example The present test example provides the performance of the self-healing materials provided by each of the embodiments and comparative examples, as follows: Test method for ice resistance: The coating was applied to one surface of an aluminum sheet in a spin coating manner, with a coating thickness of 1 μm, dried to obtain a sample to be tested. The ice delay time (IDT) of the surface of the sample to be tested was measured using a semiconductor cooling and heating platform. The specific steps include: cooling the semiconductor cooling and heating platform from room temperature to -15°C, while argon is pumped into the sample chamber to obtain a dry environment, and the sample to be tested is fixed on the surface of the semiconductor cooling and heating platform for 10 minutes to ensure thermal equilibrium. 40 μL of deionized water was dropped on the surface of the aluminum sheet, and the change of the water droplet was recorded until the water droplet completely froze, and the ice delay time was obtained.

[0060] Test method for tensile properties: the elastic modulus, elongation at break and tensile strength were obtained by referring to the standard GB / T 1040.

[0061] Test method for self-healing properties: the coating was made into a round cake sample using a mold, with a diameter of 40 mm and a thickness of 1 mm. The sample was cut in half and placed together again, and the time required for the sample to contact and heal at 40°C was recorded. The elongation at break was tested before cutting and after healing by referring to the standard GB / T 1040, and the self-healing efficiency was the ratio of the elongation at break after healing to the elongation at break before cutting.

[0062] Table 1 Test results of each embodiment and comparative example

[0063] From the above test results, the self-healing material prepared by the first hydrogen bonding compound and the second hydrogen bonding compound has a short self-healing time, a long anti-icing delay time, and good mechanical properties after self-healing.

[0064] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. In this document, the terms“comprises”,“comprising”, or any other variation thereof, will cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0065] The above description is merely that of specific embodiments of the present application, making it possible for those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Accordingly, the present application is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-healing material, characterized in that, The self-healing material has the following structural formula: wherein R1comprises at least one of , , , , . said R2is selected from ; The n is 40-70.

2. A self-healing material, characterized in that, The raw materials of the self-healing material include: a capped polydimethylsiloxane, a crosslinking agent, a first hydrogen bond compound, a second hydrogen bond compound; The first hydrogen bond compound includes at least one or more of 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 1,3-bis(4'-aminophenoxy)benzene, 4,4'-diaminobenzophenone, or 4,4'-diaminodiphenyl sulfide; The second hydrogen bond compound includes 2,4-diamino-1,3,5-triazine.

3. The self-healing material of claim 2, wherein, The molar ratio of the capped polydimethylsiloxane, the crosslinking agent, the first hydrogen bond compound, and the second hydrogen bond compound is 1:1:(0-0.66):(0-0.66), none of which is 0.

4. The self-healing material of claim 3, wherein, The molar ratio of the capped polydimethylsiloxane, the crosslinking agent, the first hydrogen bond compound, and the second hydrogen bond compound is 1:1:(0.3-0.66):(0.3-0.66).

5. Self-healing material according to any one of claims 2-4, characterized in that, The capped group includes an aminopropyl group; preferably, the capped polydimethylsiloxane is bis(3-aminopropyl) terminated polydimethylsiloxane; And / or, the molecular weight of the capped polydimethylsiloxane is 3000-5000 g / mol; And / or, the crosslinking agent includes at least one or more of toluene diisocyanate, diphenyl methane diisocyanate, dicyclohexyl methane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, or isophorone diisocyanate.

6. A method of preparing a self-healing material according to claim 1 or any one of claims 2 to 5, characterized in that, The method includes the following steps: (1) The capped polydimethylsiloxane reacts with the crosslinking agent to obtain a prepolymer; (2) The first hydrogen bond compound and the second hydrogen bond compound are added to the prepolymer, reacted to obtain a reaction product, and then treated and dried.

7. The production method according to claim 6, wherein In the step (1), the temperature of the reaction is 20-30°C, and the time is 18-24 h.

8. The production method according to claim 6 or 7, characterized by, In the step (2), the temperature of the reaction is 60-80°C, and the time is 15-20 h.

9. The method of any one of claims 6-8, wherein, The post-treatment includes standing after adding an alcohol solvent to the reaction product and dilution; Preferably, the alcohol solvent includes methanol and / or ethanol.

10. An icephobic coating, characterized in that, The self-healing material of any one of claims 2-5.

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