Self-repairing easy-to-clean coating material, and preparation method and application thereof

Abstract

The application provides a self-repairing easy-to-clean coating material and a preparation method and application thereof, and the self-repairing easy-to-clean coating material comprises catechin modified perfluoropolyether siloxane, polydopamine microcapsules and fluorine solvent A, and the shell material of the polydopamine microcapsules comprises polydopamine, and the core material comprises a polyalkyl organometallic salt; by selecting the catechin modified perfluoropolyether siloxane as a matrix and adding the polydopamine microcapsules, the obtained self-repairing easy-to-clean coating material has good bonding performance with a stainless steel substrate, the coating has high hardness, excellent hydrophobicity, self-repairing property and antibacterial property, and can effectively protect the stainless steel substrate after being coated on the surface of the stainless steel substrate, thereby effectively improving the use performance and service life of kitchen electrical products.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a self-healing and easy-to-clean coating material, its preparation method, and its application. Background Technology

[0002] Kitchen appliances are exposed to heavy oil fumes for extended periods, coming into contact with large amounts of oil fumes, acidic and alkaline food ingredients, seasonings, and other pollutants. This makes it easy for grease or food residue to adhere to the surface and interior of the appliances. Over time, this can become a breeding ground for bacteria, mold, and other microorganisms, resulting in unpleasant odors, serious health risks, and a very poor user experience.

[0003] Stainless steel is a common base material for kitchen appliances, and achieving easy-to-clean surfaces is a goal pursued by the industry. Currently, common easy-to-clean coating technologies mainly include hydrophobic non-stick coatings. Hydrophobic non-stick coatings include fluorocarbon coatings, UV-cured fluorocarbon coatings, and silicone coatings. These coatings contain abundant fluorosilicone groups in their resin structure, which tend to migrate to the surface after curing. These migrating fluorosilicone groups have low surface energy, and this low surface energy characteristic allows the coating to achieve low adhesion of oil stains.

[0004] However, most commercially available low surface energy coatings have an oil contact angle of less than 90°, which does not achieve true oleophobicity. Therefore, oil stains will still adhere to the surface, and it is difficult to completely clean stubborn oil stains, such as those on the stainless steel surface of range hoods. In addition, during the use of hydrophobic and easy-to-clean coatings, their surfaces are easily damaged by chemical substances such as light and ozone, as well as by external forces, leading to coating failure. At the same time, with the rapid development of science and technology, coating materials with only superhydrophobic and easy-to-clean properties can no longer meet the increasingly demanding product usage environments.

[0005] Based on the above problems, in order to improve the overall performance of kitchen appliances, it is of great practical significance to develop a self-healing and easy-to-clean coating material that has excellent hydrophobicity, scrub resistance and antibacterial properties after curing. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a self-healing and easy-to-clean coating material, its preparation method, and its application. The self-healing and easy-to-clean coating material has excellent adhesion to stainless steel substrates, and the coating formed after curing has high hardness, excellent hydrophobicity, abrasion resistance, antibacterial properties, and self-healing properties, thereby effectively protecting stainless steel substrates and improving the performance and service life of kitchen appliances.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a self-healing and easy-to-clean coating material, the self-healing and easy-to-clean coating material comprising catechin-modified perfluoropolyether siloxane, polydopamine microcapsules and fluorinated solvent A;

[0009] The shell material of the polydopamine microcapsules includes polydopamine, and the core material includes polyalkyl organometallic salts.

[0010] First, the self-healing and easy-to-clean coating material provided by this invention includes catechin-modified perfluoropolyether siloxane; wherein, perfluoropolyether siloxane generally refers to a type of polymer whose main chain contains repeating COC ether bonds and whose hydrogen atoms in the main chain are completely replaced by fluorine atoms. The special molecular structure endows it with extremely low surface tension (about 11 to 22 mN / m), good hydrophobic and oleophobic properties and low coefficient of friction. Using it as a base material and modifying it with natural catechin as an antibacterial agent to produce catechin-modified perfluoropolyether siloxane can effectively improve the antibacterial properties of the coating and further improve the hydrophobic and oleophobic properties and scratch resistance of the coating material surface;

[0011] Secondly, the self-healing and easy-to-clean coating material provided by this invention also includes polydopamine microcapsules, and the shell material of the polydopamine microcapsules is defined as polydopamine, and the core material is defined as an organometallic salt. It is understood that microcapsule technology uses phase polymerization, in-situ polymerization and interfacial polymerization technology to encapsulate the modifier with polymer materials, thereby forming a composite modifier with a coating structure, which can prevent the influence of the external environment. Moreover, the microcapsules have a small size and a large specific surface area, which can be more compatible with the matrix material. Furthermore, due to the protective effect of the wall material on the core material, the loss of the core material can be reduced, further improving the performance.

[0012] This invention incorporates polydopamine microcapsules with polydopamine as the shell material and polyalkyl organometallic salts as the core material. Dopamine (DA) is a synthetic mussel adhesive protein that is readily oxidized and spontaneously polymerizes to form polydopamine (PDA) under alkaline conditions (pH greater than 7.5). The PDA achieves strong adhesion and deposition effects through the formation of hydrogen bonds, metal ligands, and quinone charge-transfer complexes, without requiring complex equipment or harsh reaction conditions. The polyalkyl organometallic salts possess a nonpolar long-chain structure and excellent hydrophobic properties. When the coating is damaged, the polyalkyl organometallic salts hidden within the PDA escape under high-temperature conditions, thereby enabling the coating to possess self-healing capabilities.

[0013] In summary, the present invention uses the above two materials in combination to achieve excellent adhesion between the resulting self-healing and easy-to-clean coating material and the stainless steel substrate. The coating formed after curing has high hardness, excellent hydrophobicity, abrasion resistance, antibacterial properties, and self-healing properties, which can effectively protect the stainless steel substrate and improve the performance and service life of kitchen appliances.

[0014] Preferably, the self-healing and easy-to-clean coating material comprises the following components in parts by weight:

[0015] Catechin-modified perfluoropolyether siloxane, 5-10 parts by weight;

[0016] 10-20 parts by weight of polydopamine microcapsules;

[0017] Fluorinated solvent A, 60-70 parts by weight.

[0018] The amount of the catechin-modified perfluoropolyether siloxane can be 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 7.5 parts by weight, 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight, or 10 parts by weight.

[0019] The amount of the polydopamine microcapsules can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, or 20 parts by weight, etc.

[0020] The amount of fluorinated solvent A can be 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, or 70 parts by weight, etc.

[0021] Preferably, the raw materials for preparing the catechin-modified perfluoropolyether siloxane include the following components in parts by weight:

[0022]

[0023] The content of the perfluoropolyether fluoride can be 180 parts by weight, 185 parts by weight, 190 parts by weight, 195 parts by weight, 200 parts by weight, 205 parts by weight, 210 parts by weight, 215 parts by weight, or 220 parts by weight, etc.

[0024] The content of anhydrous ethanol can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, or 30 parts by weight, etc.

[0025] The amount of the silane coupling agent can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, or 20 parts by weight, etc.

[0026] The content of the catechin compounds can be 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, or 30 parts by weight, etc.

[0027] Preferably, the silane coupling agent comprises any one or a combination of at least two of γ-aminopropyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, or γ-(methacryloyloxy)propyltrimethoxysilane.

[0028] Preferably, the catechin compounds include any one or a combination of at least two of catechin, epicatechin, gallocatechin, or catechin gallate.

[0029] Preferably, the catechin-modified perfluoropolyether siloxane is prepared by the following method, which includes the following steps:

[0030] (A1) Perfluoropolyether fluoride and anhydrous ethanol are reacted in fluorinated solvent B, and after cooling, washing, drying, filtering and distillation, perfluoropolyether methyl ester is obtained.

[0031] (A2) React perfluoropolyether methyl ester and silane coupling agent, add anhydrous ethanol and fluorinated solvent C for mixing, let stand and separate the liquid, take the lower layer liquid for vacuum distillation to obtain perfluoropolyether siloxane.

[0032] (A3) The perfluoropolyether siloxane and catechin compounds are mixed in fluorinated solvent D to obtain the catechin-modified perfluoropolyether siloxane.

[0033] Preferably, the reaction in step (A1) includes two stages: stage 1 is to react at room temperature for 1 to 2 hours (e.g., 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, or 2 hours); stage 2 is to raise the temperature to 50 to 70°C (e.g., 50°C, 52°C, 54°C, 56°C, 58°C, 60°C, 62°C, 64°C, 66°C, 68°C, or 70°C) and react for 1 to 2 hours (e.g., 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, or 2 hours).

[0034] Preferably, the reaction temperature in step (A2) is 50 to 70°C, for example, 50°C, 52°C, 54°C, 56°C, 58°C, 60°C, 62°C, 64°C, 66°C, 68°C, or 70°C.

[0035] Preferably, the reaction time in step (A2) is 2 to 4 hours, such as 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours, 3 hours, 3.2 hours, 3.4 hours, 3.6 hours, 3.8 hours, or 4 hours.

[0036] Preferably, the reaction in step (A2) is carried out under nitrogen protection.

[0037] Preferably, the mixing temperature in step (A3) is 30 to 35°C, such as 30°C, 31°C, 32°C, 33°C, 34°C, or 35°C.

[0038] Preferably, the mixing time in step (A3) is 20 to 40 minutes, such as 20 minutes, 24 minutes, 26 minutes, 28 minutes, 30 minutes, 32 minutes, 34 minutes, 36 minutes, 38 minutes, or 40 minutes.

[0039] Preferably, the raw materials for preparing the polydopamine microcapsules include the following components in parts by weight:

[0040] 100 parts by weight of polyalkyl organometallic salt;

[0041] Dopamine 70-90 parts by weight.

[0042] The content of dopamine can be 70 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 84 parts by weight, 86 parts by weight, 88 parts by weight, or 90 parts by weight.

[0043] Preferably, the polyalkyl organometallic salt includes any one or a combination of at least two of sodium octane sulfonate and sodium dodecyl sulfonate, sodium dodecyl sulfonate, sodium polystyrene sulfonate, or polydiallyl dimethyl ammonium chloride.

[0044] Preferably, the preparation method of the polydopamine microcapsules includes: dissolving a polyalkyl organometallic salt in a buffer solution, adding dopamine and mixing to obtain the polydopamine microcapsules.

[0045] Preferably, the buffer solution comprises tris(hydroxymethyl)aminomethane hydrochloride buffer.

[0046] Preferably, the pH value of the buffer solution is 8 to 9, such as 8, 8.2, 8.4, 8.6, 8.8 or 9.

[0047] Preferably, the mixing temperature is 40-60°C, such as 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C, or 60°C.

[0048] Preferably, the mixing time is 20 to 30 hours, such as 20 hours, 22 hours, 24 hours, 26 hours, 28 hours, or 30 hours.

[0049] Preferably, the fluorinated solvent A, fluorinated solvent B, fluorinated solvent C and fluorinated solvent D each independently comprise any one or a combination of at least two of perfluorohexane, perfluorocyclohexane, perfluoromethylcyclohexane, perfluorotoluene or perfluoroheptane.

[0050] In a second aspect, the present invention provides a method for preparing a self-healing and easy-to-clean coating material as described in the first aspect, the method comprising: mixing catechin-modified perfluoropolyether siloxane, polydopamine microcapsules and fluorinated solvent A uniformly to obtain the self-healing and easy-to-clean coating material.

[0051] Thirdly, the present invention provides a method of using the self-healing and easy-to-clean coating material as described in the first aspect, the method comprising: applying the self-healing and easy-to-clean coating material to the surface of a stainless steel plate, and drying and curing it to form a self-healing and easy-to-clean coating on the stainless steel plate.

[0052] Preferably, the drying temperature is 20 to 40°C, such as 20°C, 22°C, 24°C, 26°C, 28°C, 30°C, 32°C, 34°C, 36°C, 38°C, or 40°C.

[0053] Preferably, the drying time is 5 to 10 minutes, such as 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes.

[0054] Preferably, the curing temperature is 120-140℃, such as 120℃, 124℃, 128℃, 132℃, 135℃, 138℃ or 140℃.

[0055] Preferably, the curing time is 40 to 60 minutes, such as 40 minutes, 42 minutes, 44 minutes, 46 minutes, 48 ​​minutes, 50 minutes, 52 minutes, 54 minutes, 56 minutes, 58 minutes, or 60 minutes.

[0056] Fourthly, the present invention provides an application of the self-healing and easy-to-clean coating material as described in the first aspect in kitchen appliances.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] The self-healing and easy-to-clean coating material provided by this invention includes catechin-modified perfluoropolyether siloxane, polydopamine microcapsules, and fluorinated solvent A. The shell material of the polydopamine microcapsules includes polydopamine, and the core material includes polyalkyl organometallic salts. By selecting the catechin-modified perfluoropolyether siloxane as the matrix and adding polydopamine microcapsules, the resulting self-healing and easy-to-clean coating material has good adhesion to stainless steel substrates. The coating also has high hardness, excellent hydrophobicity, self-healing properties, and antibacterial properties. After being coated on the surface of stainless steel substrates, it can effectively protect the stainless steel substrates, thereby effectively improving the performance and service life of kitchen appliances. Detailed Implementation

[0059] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0060] Preparation Example 1-1

[0061] A polydopamine microcapsule is prepared by means of: adding 100 parts by weight of sodium dodecyl sulfonate to 60 mL of tris(hydroxymethyl)aminomethane hydrochloride solution with pH 8, sonicating for 20 min to form a white emulsion, then adding 80 parts by weight of dopamine hydrochloride, and stirring at 50 °C for 24 h to obtain a polydopamine microcapsule solution.

[0062] Preparation Examples 1-2

[0063] A polydopamine microcapsule is prepared by means of: adding 100 parts by weight of sodium dodecyl sulfonate to 60 mL of tris(hydroxymethyl)aminomethane hydrochloride solution with pH 8, sonicating for 20 min to form a white emulsion, then adding 75 parts by weight of dopamine hydrochloride, and stirring at 50 °C for 24 h to obtain a polydopamine microcapsule solution.

[0064] Preparation Examples 1-3

[0065] A polydopamine microcapsule is prepared by means of: adding 100 parts by weight of sodium dodecyl sulfonate to 60 mL of tris(hydroxymethyl)aminomethane hydrochloride solution with pH 8, sonicating for 20 min to form a white emulsion, then adding 85 parts by weight of dopamine hydrochloride, and stirring at 50 °C for 24 h to obtain a polydopamine microcapsule solution.

[0066] Preparation Examples 1-4

[0067] A polydopamine microcapsule is prepared by means of: adding 100 parts by weight of sodium dodecyl sulfonate to 60 mL of tris(hydroxymethyl)aminomethane hydrochloride solution with pH 8, sonicating for 20 min to form a white emulsion, then adding 60 parts by weight of dopamine hydrochloride, and stirring at 50 °C for 24 h to obtain a polydopamine microcapsule solution.

[0068] Preparation Examples 1-5

[0069] A polydopamine microcapsule is prepared by means of: adding 100 parts by weight of sodium dodecyl sulfonate to 60 mL of tris(hydroxymethyl)aminomethane hydrochloride solution with pH 8, sonicating for 20 min to form a white emulsion, then adding 100 parts by weight of dopamine hydrochloride, and stirring at 50 °C for 24 h to obtain a polydopamine microcapsule solution.

[0070] Preparation Example 2-1

[0071] A catechin-modified perfluoropolyether siloxane, the preparation method of which includes the following steps:

[0072] (1) 200 parts by mass of perfluoropolyether acyl fluoride were dissolved in 400 parts by mass of perfluorohexane, and 10 parts by mass of anhydrous ethanol were added dropwise. The mixture was stirred at room temperature for 1.5 h, and then heated to 60 °C for 1.5 h. After the reaction was completed, the mixture was cooled to room temperature, filtered, and the solvent was distilled off to obtain perfluoropolyether methyl ester.

[0073] (2) Then add 12 parts by mass of KH550 silane coupling agent to perfluoropolyether methyl ester, react at 60°C for 3 hours under nitrogen protection, then cool to room temperature, add 23 parts by mass of anhydrous ethanol and 167 parts by mass of perfluorohexane, let stand and separate the liquid, take out the lower liquid, evaporate the solvent under reduced pressure to obtain colorless and transparent perfluoropolyether siloxane.

[0074] (3) Then, 20 parts by mass of catechin (290.27 g / mol) were added to 50 parts by mass of fluorohexane to obtain a mixed solvent. After stirring evenly, the mixture was added to perfluoropolyether siloxane and stirred at 30°C for 30 min to obtain catechin-modified perfluoropolyether siloxane.

[0075] Comparative Preparation Example 2-1

[0076] A perfluoropolyether siloxane, the preparation method of which includes the following steps:

[0077] (1) 200 parts by mass of perfluoropolyether acyl fluoride were dissolved in 400 parts by mass of perfluorohexane, and 10 parts by mass of anhydrous ethanol were added dropwise and stirred at room temperature for 1.5 h. Then the temperature was raised to 60 °C and reacted for 1.5 h. After cooling to room temperature, the solvent was removed by filtration and distillation to obtain perfluoropolyether methyl ester.

[0078] (2) Add 12 parts by mass of KH550 silane coupling agent to perfluoropolyether methyl ester, react at 60°C for 3 hours under nitrogen protection, then cool to room temperature, add 23 parts by mass of anhydrous ethanol and 167 parts by mass of perfluorohexane, let stand and separate the liquid, take out the lower liquid, evaporate the solvent under reduced pressure to obtain colorless and transparent perfluoropolyether siloxane.

[0079] Examples 1-7 and Comparative Examples 1-3

[0080] Examples 1-7 and Comparative Examples 1-3 each provide a self-healing and easy-to-clean coating material, the components of which are shown in Table 1. In Table 1, the amount of each component is in parts by weight.

[0081] Table 1

[0082]

[0083] The preparation methods of the self-healing and easy-to-clean coating materials provided in Examples 1-7 and Comparative Examples 1-3 include: first, mixing fluorinated solvent A and perfluoropolyether siloxane, then adding polydopamine microcapsules and stirring thoroughly for 1 minute to obtain the self-healing and easy-to-clean coating material.

[0084] Performance testing:

[0085] Stainless steel plates were ultrasonically cleaned with acetone, anhydrous ethanol and deionized water respectively, and dried at 100°C for later use. The self-healing and easy-to-clean coating material was sprayed onto the surface of the cleaned stainless steel plates. After standing at room temperature for 5 minutes, the plates were placed in an oven and cured at 130°C for 40 minutes to form a self-healing and easy-to-clean coating on the surface of the stainless steel plates. The self-healing and easy-to-clean coating was tested in the following manner.

[0086] (1) Hardness: Tested in accordance with GB / T 6739;

[0087] (2) Water contact angle: The water contact angle of the coating surface was tested in accordance with GB / T 24368-2009;

[0088] (3) Coating adhesion: Tested in accordance with GB / T 9286;

[0089] (4) Abrasion resistance: The coating of the sample was wiped with a wet scouring pad with a force of 10N, one round trip is counted as one wipe, and a total of 3000 wipes were performed. After the test, the surface of the coating was wiped clean and the water contact angle was tested.

[0090] (5) Self-healing performance: After the abrasion resistance test, the coating was placed in an environmental chamber at 120°C for 20 minutes, and then the sample was taken out and allowed to cool to room temperature. The water contact angle of the surface coating was then tested.

[0091] (6) Antibacterial properties: Tested according to GB 21551.2-2010, including the inhibition rate of the material against Escherichia coli.

[0092] The self-healing and easy-to-clean coating materials provided in Examples 1-7 and Comparative Examples 1-3 were tested according to the above test methods. The test results are shown in Table 2.

[0093] Table 2

[0094]

[0095] According to the data in Table 2:

[0096] (1) The coatings formed by the self-healing and easy-to-clean coating materials provided in Examples 1 to 3 have a hardness of 7H to 8H, a water contact angle of 120 to 123°, and a coating adhesion of 0. After wiping, the water contact angle of the coating can still reach 82 to 85°. After heat treatment, the water contact angle of the coating can still reach 110 to 112°. The antibacterial rate against Escherichia coli can reach 99%. It has high hardness, excellent anti-wiping properties, self-healing properties and antibacterial properties.

[0097] (2) Compared with Example 1, the coating material provided in Comparative Example 1 did not contain polydopamine microcapsules, and the water contact angle of the coating after heat treatment was only 83°, which did not have self-healing properties.

[0098] (3) Compared with Example 1, the perfluoropolyether siloxane used in the coating material provided in Comparative Example 2 was not modified with catechin and did not have antibacterial properties. Its antibacterial rate against Escherichia coli was only 75%.

[0099] (4) Compared with Example 1, sodium dodecyl sulfonate was directly added to the coating material provided in Comparative Example 3 without being made into microcapsules, resulting in a water contact angle of only 83° after heat treatment of the coating, which does not have self-healing properties.

[0100] (5) Compared with Example 1, the amount of sodium dodecyl sulfonate added in the polydopamine microcapsules used in the coating material provided in Example 4 is relatively too high, resulting in low coating hardness and water contact angle. The water contact angle is also low after wiping and after heat treatment, and the self-healing property is poor. In contrast, the amount of sodium dodecyl sulfonate added in the polydopamine microcapsules used in the coating material provided in Example 5 is relatively too low, which also results in low water contact angle of the coating after wiping and after heat treatment, and poor self-healing property.

[0101] (6) Compared with Example 1, the amount of polydopamine microcapsules added in the coating material provided in Example 6 is relatively low, resulting in poor self-healing properties of the coating. After wiping and heat treatment, the water contact angle of the coating decreases significantly. In contrast, the amount of polydopamine microcapsules added in the coating material provided in Example 7 is relatively high, resulting in low hardness and water contact angle of the coating, poor hydrophobicity, and similar self-healing properties.

[0102] The applicant declares that this invention illustrates a self-healing and easy-to-clean coating material, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials in the product of this invention, additions of auxiliary components, and selection of specific methods, all fall within the protection and disclosure scope of this invention.

Claims

1. A self-repairing easy-to-clean coating material, characterized in that, The self-healing and easy-to-clean coating material comprises the following components by weight: Catechin-modified perfluoropolyether siloxane, 5-10 parts by weight; 10-20 parts by weight of polydopamine microcapsules; Fluorinated solvent A: 60-70 parts by weight; The raw materials for preparing the polydopamine microcapsules include the following components in parts by weight: 100 parts by weight of polyalkyl organometallic salt; 70-90 parts by weight of dopamine; The polyalkyl organometallic salt is any one or a combination of at least two of sodium octane sulfonate, sodium dodecyl sulfonate, sodium polystyrene sulfonate, or polydiallyl dimethyl ammonium chloride. The preparation method of the polydopamine microcapsules includes: dissolving a polyalkyl organometallic salt in a buffer solution, adding dopamine and mixing to obtain the polydopamine microcapsules; The buffer solution is trihydroxymethylaminomethane hydrochloride buffer.

2. The self-repairing easy-to-clean coating material according to claim 1, characterized in that, The raw materials for preparing the catechin-modified perfluoropolyether siloxane include the following components in parts by weight: 180-220 parts by weight of perfluoropolyether fluoride; 10-30 parts by weight of anhydrous ethanol; 10-20 parts by weight of silane coupling agent; 20-30 parts by weight of catechin compounds.

3. The self-repairing easy-to-clean coating material according to claim 2, characterized in that, The silane coupling agent includes any one or a combination of at least two of γ-aminopropyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, or γ-(methacryloyloxy)propyltrimethoxysilane.

4. The self-healing and easy-to-clean coating material according to claim 2, characterized in that, The catechin compounds include any one or a combination of at least two of catechins, epicatechins, gallocatechins, or catechin gallate esters.

5. The self-healing and easy-to-clean coating material according to claim 2, characterized in that, The catechin-modified perfluoropolyether siloxane is prepared by the following method, which includes the following steps: (A1) Perfluoropolyether fluoride and anhydrous ethanol are reacted in fluorinated solvent B, and after cooling, washing, drying, filtering and distillation, perfluoropolyether methyl ester is obtained. (A2) React perfluoropolyether methyl ester and silane coupling agent, add anhydrous ethanol and fluorinated solvent C for mixing, let stand and separate the liquid, take the lower layer liquid for vacuum distillation to obtain perfluoropolyether siloxane. (A3) The perfluoropolyether siloxane and catechin compounds are mixed in fluorinated solvent D to obtain the catechin-modified perfluoropolyether siloxane.

6. The self-healing and easy-to-clean coating material according to claim 5, characterized in that, The reaction described in step (A1) consists of two stages: stage 1 is a reaction at room temperature for 1-2 hours, and stage 2 is a reaction at 50-70°C for 1-2 hours.

7. The self-healing and easy-to-clean coating material according to claim 5, characterized in that, The reaction in step (A2) is carried out at a temperature of 50-70°C for 2-4 hours.

8. The self-healing and easy-to-clean coating material according to claim 5, characterized in that, The reaction described in step (A2) is carried out under nitrogen protection.

9. The self-healing and easy-to-clean coating material according to claim 5, characterized in that, The mixing temperature in step (A3) is 30~35℃, and the time is 20~40 min.

10. The self-healing and easy-to-clean coating material according to claim 1, characterized in that, The pH value of the buffer solution is 8-9.

11. The self-healing and easy-to-clean coating material according to claim 1, characterized in that, The mixing temperature is 40~60℃, and the time is 20~30 h.

12. The self-healing and easy-to-clean coating material according to claim 1 or 5, characterized in that, The fluorinated solvents A, B, C, and D each independently comprise any one or a combination of at least two of perfluorohexane, perfluorocyclohexane, perfluoromethylcyclohexane, perfluorotoluene, or perfluoroheptane.

13. A method for preparing a self-healing and easy-to-clean coating material as described in any one of claims 1 to 12, characterized in that, The preparation method includes: mixing catechin-modified perfluoropolyether siloxane, polydopamine microcapsules and fluorinated solvent A evenly to obtain the self-healing and easy-to-clean coating material.

14. A method of using the self-healing, easy-to-clean coating material as described in any one of claims 1 to 12, characterized in that, The method of use includes: applying a self-healing and easy-to-clean coating material to the surface of a stainless steel plate, and then drying and curing it to form a self-healing and easy-to-clean coating on the stainless steel plate.

15. The method of use according to claim 14, characterized in that, The drying temperature is 20~40℃, and the time is 5~10 min.

16. The method of use according to claim 14, characterized in that, The curing temperature is 120~140℃ and the time is 40~60 min.

17. The application of a self-healing, easy-to-clean coating material as described in any one of claims 1 to 12 in kitchen appliances.

Images