Preparation Method of Bionic Adhesive and Hydrophobic Ion Synergistic Durable Anti-icing Coating

Abstract

The present invention discloses a preparation method of a bionic adhesive and a hydrophobic ion synergistic durable anti-icing coating. The present invention includes the following steps: (1) preparation of an amphiphilic ionic copolymer; (2) preparation of a bionic adhesive; (3) preparation of an anti-icing coating. The bionic adhesive introduced in the present invention can interact with the substrate and the amphiphilic ionic copolymer network by virtue of its inherent bionic adhesion ability, and has a bactericidal function, which helps to construct a mechanically durable interpenetrating network coating. Thanks to the combination of the amphiphilic ionic copolymer and the bionic adhesive, the synergistic interaction of multiple dynamic bonds in the supramolecular network matrix endows the coating with mechanical durability, and can effectively inhibit ice nucleation, slow down ice propagation, and reduce ice adhesion through the synergistic action of hydrophobicity and ion specificity, having good anti-icing and de-icing performance, and at the same time showing potential application value in application fields such as self-cleaning, anti-fogging, and antibacterial.

Description

Technical Field

[0001] The present invention relates to the field of anti-icing technology, and particularly to a preparation method of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating. Background Art

[0002] Icing / frosting is one of the most common phenomena in nature, but the icing / frosting phenomenon on solid surfaces may bring many inconveniences to industrial production and personal life. For example, icing on the surfaces of transmission lines, solar panels, ships, etc. will affect their normal use and bring many safety problems. And active anti-icing methods based on deicing agents, heating, mechanical deicing, etc. are time-consuming, energy-consuming, inefficient, and even harmful to the environment. In contrast, passive anti-icing methods that reduce ice accumulation by changing surface properties are more sustainable.

[0003] Among them, nature-inspired superhydrophobic anti-icing coatings have attracted much attention due to their diverse functions. However, when preparing them, the substrate often needs to be treated to form a complex artificial surface microstructure, which is not universal. And the interlocking effect of liquid-filled cavities at high humidity leads to an increase in ice adhesion strength, and the surface rough structure is easily damaged during the deicing process. The poor mechanical properties limit their large-scale practical applications. Therefore, in recent years, anti-icing coatings inspired by cryobiology have received much attention. Such coatings can inhibit ice nucleation, growth, and adhesion by adjusting the properties of interfacial water, thereby enhancing the anti-freezing performance. However, when these materials are exposed to mechanical damage conditions, the grafted polymer chains are prone to failure and the durability is insufficient. Therefore, it is an urgent problem to be solved at present to design a network structure to maintain the mechanical durability of the material and prepare an all-round efficient anti-icing coating that inhibits ice nucleation, slows down ice propagation, and reduces ice adhesion to cope with the challenges brought by different environments. Summary of the Invention

[0004] The present invention aims to solve the problems of insufficient mechanical durability and single anti-icing performance of traditional anti-icing coatings. To overcome the deficiencies of the prior art, a preparation method of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating is provided. While achieving all-round anti-icing, it shows potential application value in application fields such as self-cleaning, anti-fogging, and antibacterial.

[0005] To solve the technical problems, the solution of the present invention is as follows:

[0006] (1) Preparation of amphiphilic ionic copolymer:

[0007] Solution A: Dissolve 1-2 parts by weight of emulsifier, 1-10 parts by weight of hydrophilic monomer, and 1-5 parts by weight of zwitterionic monomer in 10-100 parts by weight of solvent α.

[0008] Solution B: Dissolve 10-20 parts by weight of fluorinated acrylate monomer in 100-200 parts by weight of solvent α.

[0009] Add solution B to solution A, ultrasonically treat it in an ice-water bath for 5 min (pulse mode with 2 s of working and 3 s of interval, ultrasonic power 350 W), then add 0.1 - 1 part by weight of an initiator. After mixing evenly, heat it under a nitrogen atmosphere at 60 - 80 °C for 2 - 6 h to obtain an amphiphilic ionic copolymer.

[0010] (2) Preparation of the bionic adhesive:

[0011] Solution C: Dissolve 1 - 2 parts by weight of a polyphenolic compound in 20 - 30 parts by weight of solvent α.

[0012] Solution D: Dissolve 1 - 2 parts by weight of branched polyethyleneimine in 20 - 30 parts by weight of solvent α.

[0013] Add solution D to solution C, mix evenly, and adjust the pH to 4 - 5 with an acidic solution to obtain the bionic adhesive.

[0014] (3) Preparation of the anti-icing coating:

[0015] Take 10 - 100 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 10 - 100 parts by weight of the bionic adhesive prepared in step (2), mix them evenly to obtain a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0016] In the present invention, the emulsifier refers to one or more of fatty alcohol polyoxyethylene ether, cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, and sodium dodecyl sulfate.

[0017] In the present invention, the hydrophilic monomer refers to one or more of acrylamide, N-hydroxyethyl acrylamide, polyethylene glycol methacrylate, N,N'-methylenebisacrylamide, and polyethylene glycol methyl ether acrylate.

[0018] In the present invention, the cation in the zwitterionic monomer refers to any one of quaternary ammonium salt cations, quaternary phosphonium salt cations, imidazolium ions, and pyridinium ions. The anion in the zwitterionic monomer refers to one or more of sulfonate anions, phosphate anions, and carboxylate anions.

[0019] In the present invention, the fluorinated acrylate monomer refers to one or more of trifluoroethyl methacrylate, pentafluoropropyl methacrylate, perfluorohexylethyl methacrylate, and perfluorooctylethyl acrylate.

[0020] In the present invention, the initiator refers to one of 2,2'-azobis(2-methylpropylamidine) dihydrochloride, ammonium persulfate, and azobisisobutyronitrile.

[0021] In the present invention, the solvent α refers to one or more of water, trifluoroethanol, acetone, and ethanol.

[0022] In the present invention, the polyphenolic compound refers to one or more of dopamine, tannic acid, catechol, gallic acid, and catecholic acids.

[0023] In the present invention, the weight-average molecular weight of the branched polyethyleneimine is 10,000 - 25,000.

[0024] In the present invention, the acidic solution refers to one or more of dilute hydrochloric acid and dilute sulfuric acid.

[0025] The present invention further provides a method for applying the bionic adhesive and the hydrophobic ion synergistic durable anti-icing coating prepared by the foregoing method, including the following steps:

[0026] Clean the surface to be sprayed, and uniformly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 10 - 100 μm. Compared with the current anti-icing coatings on the market, the coating of this invention is thinner. Dry it thoroughly at room temperature with ventilation or in a blast drying oven at 60 - 80 °C to obtain the bionic adhesive and the hydrophobic ion synergistic durable anti-icing coating.

[0027] Description of the invention principle:

[0028] In the actual application process, considering the importance of the ice-substrate interface for ice adhesion, the focus should shift from the static surface to the dynamic changes in the chemical / physical state of the ice-substrate interface. As early as 2004, a non-freezing water layer was discovered at the ice-solid contact interface, but the exploration of its mechanism and its application to anti-icing were much later. Inspired by cryobiology and biological adaptation, antifreeze proteins (AFPs) in polar animals such as Arctic fish can inhibit ice nucleation, growth, and adhesion by adjusting the properties of interfacial water, thereby enhancing the anti-freezing performance.

[0029] Based on the research on the structure and anti-freezing mechanism of AFP, this invention synthesizes a highly branched fluorinated zwitterionic copolymer. By grafting hydrophobic chains onto the hydrophilic charged network, the fluorinated acrylate hydrophobic chain segments and hydrophilic chain segments such as zwitterionic electrolytes are polymerized, and crosslinked by highly branched polar / non-polar functional groups, hydrogen bonds, and ionic interactions through van der Waals forces. Among them, the perfluoroalkyl side chains can be enriched on the surface, endowing the coating with a low surface energy, which can effectively inhibit ice nuclei and reduce the ice shear strength. Hydrophilic chain segments such as zwitterions can form a hydrated layer with a disordered structure as non-ice binding sites to inhibit ice nuclei, and can migrate to the coating surface to enhance its hydrophilicity to regulate interfacial water molecules. By the ion solvation effect and H-bonding with water molecules, the freezing point of water is reduced, effectively inhibiting the propagation and diffusion of ice.

[0030] Traditional anti-icing surfaces require the preparation of complex surface microstructures and are prone to graft polymer chain failure under mechanical damage conditions, resulting in insufficient durability. In the present invention, the above problems are solved by introducing a biomimetic adhesive. The biomimetic adhesive can interact with the substrate and the amphiphilic ionic copolymer network by virtue of its inherent biomimetic adhesion ability, and also has a bactericidal function, which helps to construct a mechanically durable interpenetrating network coating. Thanks to the combination of the amphiphilic ionic copolymer and the biomimetic adhesive, the synergistic interaction of multiple dynamic bonds in the supramolecular network matrix endows the coating with mechanical durability, and can effectively inhibit ice nucleation, slow down ice propagation, and reduce ice adhesion through the synergistic effect of hydrophobicity and ion specificity, having good anti-icing and de-icing properties, and at the same time showing potential application value in application fields such as self-cleaning, anti-fogging, and antibacterial.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] (1) The anti-icing coating prepared by the present invention has inherent anti-icing advantages derived from the network structure design inside the coating, rather than some artificial surface microstructures. Compared with the existing anti-icing coatings on the market, this anti-icing coating can achieve an ideal anti-icing effect with a relatively thin coating thickness. In various complex environments, ice nucleation is effectively inhibited, ice propagation is slowed down, and ice adhesion is reduced through the synergistic effect of hydrophobicity and ion specificity, realizing all-round anti-icing and having better anti-icing / de-icing performance. And a mechanically durable supramolecular interpenetrating network is constructed through a biomimetic adhesive, overcoming the shortcomings of traditional anti-icing coatings such as single performance and insufficient durability.

[0033] (2) The anti-icing coating prepared by the present invention, with the design of the interpenetrating supramolecular network structure and the inherent advantages of the coating, opens up more possibilities in practical applications such as anti-fogging, self-cleaning, and antibacterial on the glass surface, and shows great potential in the field of new-generation optical and medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the mechanism of the anti-icing coating of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be further described in detail below with specific examples and comparative examples. The examples can enable professional technicians in the field to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0036] Such as Figure 1As shown, based on the research on the AFP structure and anti-freezing mechanism, the invention synthesizes a highly branched fluorinated zwitterionic copolymer. By grafting hydrophobic chains onto a hydrophilic charged network, a fluorinated acrylate hydrophobic chain segment and a hydrophilic chain segment such as a zwitterionic electrolyte are polymerized, and highly branched polar / non-polar functional groups acting through van der Waals forces, hydrogen bonds and ionic interactions are crosslinked. Among them, the perfluoroalkyl side chains can be enriched on the surface, endowing the coating with a low surface energy, which can effectively inhibit ice nuclei and reduce the ice shear strength. Hydrophilic chain segments such as zwitterions, as non-ice-binding sites, can form a hydrated layer with a disordered structure to inhibit ice nuclei, and can migrate to the coating surface to enhance its hydrophilicity to regulate interfacial water molecules, and reduce the water freezing point by ion solvation effects and H-bonding with water molecules, effectively inhibiting the propagation and diffusion of ice.

[0037] Example 1

[0038] The preparation and use methods of a bionic adhesive and a hydrophobic ion synergistic durable anti-icing coating involved in this example are as follows:

[0039] (1) Preparation of amphiphilic ionic copolymer:

[0040] Solution A: Dissolve 1 part by weight of cetyltrimethylammonium bromide, 1 part by weight of acrylamide, 1 part by weight of N-hydroxyethyl acrylamide, 1 part by weight of polyethylene glycol methacrylate and 1 part by weight of methacryloylethyl sulfobetaine in 10 parts by weight of water.

[0041] Solution B: Dissolve 10 parts by weight of perfluorohexylethyl methacrylate in 100 parts by weight of water.

[0042] Add Solution B to Solution A, and after ultrasonic treatment in an ice-water bath for 5 min (pulse mode with 2 s working and 3 s interval, ultrasonic power 350 W), add 0.1 part by weight of initiator ammonium persulfate. After mixing evenly, heat in a nitrogen atmosphere at 70 °C for 5 h to obtain an amphiphilic ionic copolymer.

[0043] (2) Preparation of bionic adhesive:

[0044] Solution C: Dissolve 1 part by weight of tannic acid in 20 parts by weight of water.

[0045] Solution D: Dissolve 1 part by weight of branched polyethyleneimine with a weight average molecular weight of 10,000 in 20 parts by weight of water.

[0046] Add Solution D to Solution C, and after mixing evenly, adjust the PH to 4 with dilute hydrochloric acid solution to obtain a bionic adhesive.

[0047] (3) Preparation of anti-icing coating:

[0048] Take 100 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 10 parts by weight of the bionic adhesive prepared in step (2). After mixing evenly, a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating is obtained.

[0049] (4) Coating application method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating: Clean the surface to be sprayed, and evenly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 100 μm. Dry it thoroughly in a blast oven at 80 °C to obtain a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0050] Example 2

[0051] The preparation and use methods of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating involved in this example are as follows:

[0052] (1) Preparation of the amphiphilic ionic copolymer:

[0053] Solution A: Dissolve 2 parts by weight of fatty alcohol polyoxyethylene ether, 2 parts by weight of acrylamide, 2 parts by weight of N,N'-methylenebisacrylamide, 2 parts by weight of polyethylene glycol methacrylate and 4 parts by weight of methacryloylethyl sulfobetaine in 80 parts by weight of water.

[0054] Solution B: Dissolve 20 parts by weight of perfluorooctylethyl acrylate in 200 parts by weight of water.

[0055] Add solution B to solution A, and after ultrasonic treatment in an ice-water bath for 5 min (pulse mode of working for 2 s and interval for 3 s, ultrasonic power 350 W), add 0.2 part by weight of initiator 2,2'-azobis(2-methylpropionamidine) dihydrochloride. After mixing evenly, heat it at 70 °C for 5 h under a nitrogen atmosphere to obtain the amphiphilic ionic copolymer.

[0056] (2) Preparation of the bionic adhesive:

[0057] Solution C: Dissolve 2 parts by weight of polyphenolic compounds in 30 parts by weight of water.

[0058] Solution D: Dissolve 2 parts by weight of branched polyethyleneimine with a weight average molecular weight of 15000 in 30 parts by weight of water.

[0059] Add solution D to solution C, and after mixing evenly, adjust the pH to 4.2 with dilute sulfuric acid solution to obtain the bionic adhesive.

[0060] (3) Preparation of the anti-icing coating:

[0061] Take 80 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 20 parts by weight of the bionic adhesive prepared in step (2). After mixing evenly, a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating is obtained.

[0062] (4) Coating application method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating: Clean the surface to be sprayed, and evenly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 100 μm. Dry it thoroughly in a blast oven at 80 °C to obtain a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0063] Example 3

[0064] The preparation and use methods of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating involved in this example are as follows:

[0065] (1) Preparation of the amphiphilic ionic copolymer:

[0066] Solution A: Dissolve 1 part by weight of cetyltrimethylammonium chloride, 2 parts by weight of acrylamide, 1 part by weight of methoxypolyethylene glycol acrylate, and 3 parts by weight of methacryloylethyl sulfobetaine in 60 parts by weight of trifluoroethanol.

[0067] Solution B: Dissolve 15 parts by weight of pentafluoropropyl methacrylate in 120 parts by weight of trifluoroethanol.

[0068] Add solution B to solution A, and after ultrasonic treatment in an ice-water bath for 5 min (pulse mode with 2 s working and 3 s interval, ultrasonic power 350 W), add 0.15 part by weight of the initiator azobisisobutyronitrile. After mixing evenly, heat it at 70 °C for 5 h under a nitrogen atmosphere to obtain the amphiphilic ionic copolymer.

[0069] (2) Preparation of the bionic adhesive:

[0070] Solution C: Dissolve 1.5 parts by weight of tannic acid in 25 parts by weight of trifluoroethanol.

[0071] Solution D: Dissolve 1.5 parts by weight of branched polyethyleneimine with a weight average molecular weight of 20000 in 25 parts by weight of trifluoroethanol.

[0072] Add solution D to solution C, and after mixing evenly, adjust the pH to 4.5 with dilute hydrochloric acid to obtain the bionic adhesive.

[0073] (3) Preparation of the anti-icing coating:

[0074] Take 60 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 40 parts by weight of the bionic adhesive prepared in step (2). After mixing evenly, a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating is obtained.

[0075] (4) Coating application method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating: Clean the surface to be sprayed, and evenly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 100 μm. Dry it thoroughly in a blast drying oven at 80 °C to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0076] Example 4

[0077] The preparation and use methods of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating involved in this example are as follows:

[0078] (1) Preparation of amphiphilic ion copolymer:

[0079] Solution A: Dissolve 1 part by weight of cetyltrimethylammonium chloride, 1 part by weight of fatty alcohol polyoxyethylene ether, 2 parts by weight of acrylamide, 2 parts by weight of methoxypolyethylene glycol acrylate, and 4 parts by weight of methacryloylethyl sulfobetaine in 80 parts by weight of trifluoroethanol.

[0080] Solution B: Dissolve 20 parts by weight of perfluorohexylethyl methacrylate in 200 parts by weight of trifluoroethanol.

[0081] Add Solution B to Solution A, and after ultrasonic treatment in an ice-water bath for 5 min (pulse mode with 2 s working and 3 s interval, ultrasonic power 350 W), add 0.2 part by weight of initiator azobisisobutyronitrile. After mixing evenly, heat it at 70 °C for 5 h under a nitrogen atmosphere to obtain the amphiphilic ion copolymer.

[0082] (2) Preparation of bionic adhesive:

[0083] Solution C: Dissolve 2 parts by weight of tannic acid in 30 parts by weight of trifluoroethanol.

[0084] Solution D: Dissolve 2 parts by weight of branched polyethyleneimine with a weight average molecular weight of 25000 in 30 parts by weight of trifluoroethanol.

[0085] Add Solution D to Solution C, and after mixing evenly, adjust the pH to 5 with dilute hydrochloric acid to obtain the bionic adhesive.

[0086] (3) Preparation of anti-icing coating:

[0087] Take 50 parts by weight of the amphiphilic ion copolymer prepared in step (1) and 50 parts by weight of the bionic adhesive prepared in step (2), and mix them evenly to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0088] (4) Coating application method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating: Clean the surface to be sprayed, and evenly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 100 μm. Dry it thoroughly in a blast drying oven at 80 °C to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0089] Example 5

[0090] The preparation and use method of a bionic adhesive and hydrophobic ion synergistic durable anti-icing coating involved in this example are as follows:

[0091] (1) Preparation of amphiphilic ionic copolymer:

[0092] Solution A: Dissolve 1 part by weight of cetyltrimethylammonium bromide, 1 part by weight of fatty alcohol polyoxyethylene ether, 1 part by weight of acrylamide, 1 part by weight of N,N'-methylenebisacrylamide, 1 part by weight of polyethylene glycol methacrylate, 1 part by weight of polyethylene glycol methyl ether acrylate and 3 parts by weight of methacryloylethyl sulfobetaine in 80 parts by weight of acetone.

[0093] Solution B: Dissolve 15 parts by weight of perfluorooctylethyl acrylate in 150 parts by weight of acetone.

[0094] Add Solution B to Solution A, and after ultrasonic treatment in an ice-water bath for 5 min (pulse mode of working for 2 s and interval for 3 s, ultrasonic power 350 W), add 0.15 part by weight of initiator azobisisobutyronitrile. After mixing evenly, heat it at 70 °C for 6 h under a nitrogen atmosphere to obtain the amphiphilic ionic copolymer.

[0095] (2) Preparation of bionic adhesive:

[0096] Solution C: Dissolve 1 part by weight of tannic acid in 20 parts by weight of acetone.

[0097] Solution D: Dissolve 1 part by weight of branched polyethyleneimine with a weight average molecular weight of 20000 in 20 parts by weight of acetone.

[0098] Add Solution D to Solution C, and after mixing evenly, adjust the pH to 4.2 with dilute hydrochloric acid to obtain the bionic adhesive.

[0099] (3) Preparation of anti-icing coating:

[0100] Take 40 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 60 parts by weight of the bionic adhesive prepared in step (2), and mix them evenly to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0101] (4) Coating application method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating: Clean the surface to be sprayed, and evenly coat the anti-icing coating on the surface to be sprayed by air spraying. The coating thickness of the wet film is 100 μm. Dry it thoroughly in a blast drying oven at 80 °C to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

[0102] Performance evaluation results:

[0103] (1) Anti-icing performance

[0104] The anti-icing performance of the coating was tested by the droplet freezing delay experiment and the ice nucleation temperature experiment:

[0105] For the droplet freezing delay experiment: Cool the surface temperature of the sample to -15 ± 0.5 °C by a cooling stage. Then drop 3 μL of water droplets onto the coating surface, and use an optical contact angle meter to record the morphological changes of the water droplets and time. When the water droplets are completely solidified and their tops become pointed, stop timing, and this moment is the freezing delay time.

[0106] For the ice nucleation temperature experiment: Fix the coating on the cooling stage, and drop 5 μL of water droplets on the coating surface. The cooling stage cools at a rate of 5 °C / min -1 and record the temperature at which the water droplets suddenly turn opaque.

[0107] The anti-icing performance test results are shown in Table 1. The durable anti-icing coating of the present invention effectively reduces the ice nucleation temperature and has an extremely long droplet freezing delay time.

[0108] (2) De-icing performance

[0109] The ice shear strength of the ice-phobic surface should be less than 100 kPa. The de-icing performance of the coating was tested by the ice shear strength experiment: Place a bottomless colorimetric dish on the coating surface and inject 1.5 g of water into the colorimetric dish. Cool it at -15 °C for 4 h to ensure the complete freezing of the water column. Then push the thrust meter loaded on the moving stage from the bottom at a speed of 0.1 mm / s (it is required that the distance between the force probe and the sample surface is as close as possible to avoid additional torque), and record the maximum value of the thrust during this process, which is the ice shear strength of the coating.

[0110] The de-icing performance test results are shown in Table 1. The durable anti-icing coating of the present invention has an extremely low ice shear strength, which is superior to most current anti-icing surfaces.

[0111] (3) Mechanical durability performance

[0112] The mechanical durability of the coating was evaluated by 400 - cycle sandpaper abrasion test and 200 - cycle tape peeling test. After 400 - cycle sandpaper abrasion test and 200 - cycle tape peeling test, the surface water contact angle of the durable anti - icing coating of the present invention fluctuated to a certain extent (114° - 111.8°), but still maintained its hydrophobicity.

[0113] (4) Antibacterial property

[0114] The antibacterial properties of the coating against Escherichia coli and Staphylococcus aureus were studied by the LB plate method.

[0115] The test results of antibacterial properties are shown in Table 1.

[0116] Table 1 Test results of the bionic adhesive and hydrophobic ion synergistic durable anti - icing coating

[0117]

[0118] The present invention has been described in detail and specific embodiments of the present invention have been illustrated by way of examples in the embodiment part. However, the present invention can also be made into various modification schemes and alternative forms. It should be understood that the present invention is not limited to the specific forms disclosed. The present invention covers all modification schemes, equivalent schemes and alternative schemes that fall within the essence and scope of the present invention defined by the appended claims.

Claims

1. Preparation method of bionic adhesive and hydrophobic ion synergistic durable anti-icing coating, comprising the following steps: (1) Preparation of amphiphilic ionic copolymer: Solution A: Dissolve 1-2 parts by weight of emulsifier, 1-10 parts by weight of hydrophilic monomer and 1-5 parts by weight of zwitterionic monomer in 10-100 parts by weight of solvent α; Solution B: Dissolve 10-20 parts by weight of fluorinated acrylate monomer in 100-200 parts by weight of solvent α; Add Solution B to Solution A, ultrasonically treat in an ice-water bath for 5 min, then add 0.1-1 part by weight of initiator, mix well, and heat under a nitrogen atmosphere at 60-80 °C for 2-6 h to obtain the amphiphilic ionic copolymer; (2) Preparation of bionic adhesive: Solution C: Dissolve 1-2 parts by weight of polyphenolic compound in 20-30 parts by weight of solvent α; Solution D: Dissolve 1-2 parts by weight of branched polyethyleneimine in 20-30 parts by weight of solvent α; Add Solution D to Solution C, mix well, and adjust the pH to 4-5 with an acidic solution to obtain the bionic adhesive; (3) Preparation of anti-icing coating: Take 10-100 parts by weight of the amphiphilic ionic copolymer prepared in step (1) and 10-100 parts by weight of the bionic adhesive prepared in step (2), mix evenly to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating; The emulsifier refers to one or more of fatty alcohol polyoxyethylene ether, cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, sodium dodecyl sulfate; The hydrophilic monomer refers to one or more of acrylamide, N-hydroxyethyl acrylamide, polyethylene glycol methacrylate, polyethylene glycol methyl ether acrylate; The cation in the zwitterionic monomer refers to any one of quaternary ammonium salt cation, quaternary phosphonium salt cation, imidazolium ion, pyridinium ion; the anion in the zwitterionic monomer refers to one or more of sulfonate anion, phosphate anion, carboxylate anion; The fluorinated acrylate monomer refers to one or more of trifluoroethyl methacrylate, pentafluoropropyl methacrylate, perfluorohexylethyl methacrylate, perfluorooctylethyl acrylate; The initiator refers to one of 2,2'-azobis(2-methylpropylamidine) dihydrochloride, ammonium persulfate, azobisisobutyronitrile; The solvent α refers to one or more of water, trifluoroethanol, acetone, ethanol; The polyphenolic compound refers to one or more of dopamine, tannic acid, catechol, gallic acid, catechuic acid; the acidic solution refers to one or more of dilute hydrochloric acid, dilute sulfuric acid.

2. The preparation method of the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating according to claim 1, characterized in that The weight-average molecular weight of the branched polyethyleneimine is 10,000-25,000.

3. The method of using the coating prepared by the preparation method according to claim 2, characterized in that, Comprising the following steps: Clean the surface to be sprayed, evenly coat the anti-icing coating on the surface to be sprayed by air spraying, and the coating thickness of the wet film is 10-100 μm; fully dry in a well-ventilated and dry normal temperature or a blast drying oven at 60-80 °C to obtain the bionic adhesive and hydrophobic ion synergistic durable anti-icing coating.

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