Super hydrophilic-oleophobic coating composition, coating, preparation method thereof and coated product

Abstract

The present application relates to the field of chemical materials technology, and specifically to a super hydrophilic-oleophobic coating composition, its preparation method, coating and coated product. The super hydrophilic-oleophobic coating composition includes by weight percentage: 6% to 12% alcohol-soluble fluorocarbon resin, 2% to 4% water-soluble amino resin, 0.3% to 0.5% water-soluble fluorinated surfactant, 0.6% to 1% inorganic salt, 0.8% to 1% hydrophilic fumed silica, and solvent; the mass concentration of alcohol-soluble fluorocarbon resin is 40% to 60%. The coating composition of the present application can form a matte coating on the surface of the appliance, so that the surface has super hydrophilic-oleophobic properties, which has the effect of preventing heavy oil pollution and easy cleaning of underwater oil pollution.

Description

Technical Field

[0001] The present application relates to the technical field of chemical materials, and in particular to a super hydrophilic-oleophobic coating composition, a coating, a preparation method thereof, and a coated product. Background Art

[0002] With the development of cities and the improvement of quality of life, people have higher and higher requirements for kitchen environment. The removal of kitchen oil stains is a major problem that needs to be solved at present. During the use of the kitchen, a large amount of oil, water, oil smoke and ash and mixtures are generated. These oil stains are easily attached to the surface of kitchen utensils, such as oil bottles, seasoning pots, pot lids, range hoods, etc. The long-term accumulated oil stains have properties similar to paint and are extremely difficult to remove.

[0003] In order to solve the problem of cleaning oil stains, a report discloses an anti-oil stain coating. The coated products prepared by using the coating can reduce the adhesion of oil stains and facilitate cleaning. However, kitchen oil stains are more difficult to clean than ordinary oil stains. This may be because the main components of kitchen oil stains are vegetable oils and animal oils. These oils can undergo oxidation and aggregation reactions at high temperatures and are mixed with other oil stains. After a long time, the oil stains become more and more sticky and even dry and harden, making cleaning more difficult. Therefore, it is necessary to develop anti-oil stain coatings and products for heavy oil stains such as kitchen oil stains. Summary of the invention

[0004] Based on this, the purpose of the present application includes providing a super hydrophilic-oleophobic coating composition, a coating, a preparation method thereof and a coated product. The coating composition can form a matte coating on a solid surface. The coating has super hydrophilic-oleophobic properties, can prevent heavy oil pollution, and has the effect of easy cleaning of underwater oil pollution.

[0005] One aspect of the present application provides a super hydrophilic-oleophobic coating composition, which comprises, by weight percentage:

[0006]

[0007] Wherein, the alcohol-soluble fluorocarbon resin includes a compound having the following structure:

[0008]

[0009] Wherein, n is 11 to 20, m is 2 to 6, and x is 3 to 8;

[0010] The mass concentration of the alcohol-soluble fluorocarbon resin is 40% to 60%.

[0011] In some embodiments, the super hydrophilic-oleophobic coating composition has a solid content of 6%-14%.

[0012] In some embodiments, the alcohol-soluble fluorocarbon resin is prepared by a method comprising the following preparation steps:

[0013] Mixing hexafluorobutyl acrylate monomer, hydroxyethyl methacrylate monomer and acrylic acid monomer in a molar ratio of 1: (0.1-0.55): (0.15-0.73) to obtain a monomer mixture;

[0014] An initiator and an alcohol are added to the monomer mixture and mixed, and the obtained mixture is heated to 70° C. to 90° C. for reaction to obtain the alcohol-soluble fluorocarbon resin.

[0015] In some embodiments, in the preparation step of the alcohol-soluble fluorocarbon resin:

[0016] The initiator accounts for 0.8% to 0.12% of the total weight of the monomer mixture; and / or

[0017] The initiator comprises azobisisobutyronitrile; and / or

[0018] The reaction time is 2h to 5h.

[0019] In some embodiments, the water-soluble amino resin includes at least one of the following features:

[0020] 1) Solid content is 80% to 90%,

[0021] 2) The non-volatile content is 80±2%,

[0022] 3) The viscosity is 2000mPa·s to 5000mPa·s.

[0023] In some embodiments, the water-soluble amino resin includes at least one of Cymel 325 and Cymel 385.

[0024] In some embodiments, the water-soluble fluorinated surfactant includes at least one of Capstone FS-50, Capstone FS-10, and Capstone FS-31; and / or

[0025] The inorganic salt includes at least one of aluminum dihydrogen phosphate, aluminum phosphate and sodium silicate.

[0026] Another aspect of the present application provides a super hydrophilic-oleophobic coating, which is prepared from the super hydrophilic-oleophobic coating composition described in any of the above technical solutions.

[0027] Another aspect of the present application provides a method for preparing the above-mentioned super hydrophilic-oleophobic coating, comprising the following steps:

[0028] Prepare various raw materials according to the formula of the super hydrophilic-oleophobic coating composition described in any of the above technical solutions;

[0029] The hydrophilic fumed silica, the inorganic salt and the ethanol are mixed in a formula amount, and then the alcohol-soluble fluorocarbon resin, the water-soluble amino resin and the water-soluble fluorinated surfactant are added and mixed to prepare a super hydrophilic-oleophobic coating composition;

[0030] The super hydrophilic-oleophobic coating composition is distributed on a solid surface and dried to obtain the super hydrophilic-oleophobic coating.

[0031] Another aspect of the present application provides a coated product, the surface coating of which is the super hydrophilic-oleophobic coating described above.

[0032] The technical solution of the present application provides a super hydrophilic-oleophobic coating composition, the anti-oil effect of the coating composition is based on the super hydrophilic surface wetting principle, which includes appropriate amounts of alcohol-soluble fluorocarbon resin, water-soluble amino resin, water-soluble fluorinated surfactant, inorganic salt, hydrophilic fumed silica and solvent. The prepared super hydrophilic-oleophobic coating can effectively avoid the adhesion of oil stains, solve the problem of heavy oil stains being difficult to clean from the root, and has the effect of easy cleaning of heavy oil stains underwater.

[0033] The superhydrophilic-oleophobic coating composition and coated product of the present application are suitable for kitchens. For example, they can be used to form coatings on the surfaces of objects such as tiles, doors and windows, suspended ceilings, cabinets, etc. in the kitchen. They can also be used to prepare kitchen utensils with the superhydrophilic-oleophobic coating, such as oil bottles, seasoning pots, pot lids, range hoods, etc., which effectively prevent and control the adhesion of oil stains, are easy to clean, have low production costs, are easy to prepare, and can be mass-produced and applied.

[0034] The super hydrophilic-oleophobic coating composition of the present application is a matte coating composition, which can be sprayed on the surface of the utensil to form a matte coating, so that the surface has super hydrophilic-oleophobic properties, so as to achieve the effect of easy cleaning of heavy oil stains in the kitchen underwater, and is easy to use and simple to operate. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the embodiments and examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. In addition, it should be understood that after reading the content taught in the present application, those skilled in the art may make various changes or modifications to the present application, and these equivalent forms also fall within the protection scope of the claims attached to the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] the term

[0038] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0039] The terms "and / or", "or / and", and "and / or" used in this article include any one of two or more related listed items, and also include any and all combinations of related listed items, and the arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that in this application, the technical solution undoubtedly includes technical solutions that are all connected by "logical and", and undoubtedly includes technical solutions that are all connected by "logical or". For example, "A and / or B" includes three parallel solutions of A, B and A+B. For example, the technical solution of "A, and / or, B, and / or, C, and / or, D" includes any one of A, B, C, and D (that is, the technical solution that is all connected by "logical OR"), and also includes any and all combinations of A, B, C, and D, that is, the combination of any two or any three of A, B, C, and D, and also includes the combination of four of A, B, C, and D (that is, the technical solution that is all connected by "logical AND").

[0040] Herein, "preferred", "preferable", "better", etc. are only used to describe implementation methods or examples with better effects. It should be understood that they do not constitute limitations on the scope of protection of this application.

[0041] In the present application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present application.

[0042] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0043] In the present application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical range, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to integers within the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0044] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0045] In the present application, weight may be μg, mg, g, kg or other mass units known in the chemical industry.

[0046] In the present application, unless otherwise specified, the size, particle size and diameter generally refer to the average value.

[0047] The anti-oil pollution described in this application includes reducing the adhesion of oil pollution and facilitating cleaning after adhesion. The construction principles of anti-oil pollution surfaces include constructing super-hydrophilic surfaces and super-hydrophobic surfaces, and the easy-to-clean effects of these two surfaces are related to the surface wettability. Wetting refers to the phenomenon that one liquid replaces another liquid from the solid surface, and the solid interface undergoes a transformation from a solid-gas interface to a solid-liquid interface of equal area. The wettability of a material can be characterized by the contact angle θ. When 0°<θ<90°, the material is considered to be hydrophilic, that is, the liquid is easier to wet the solid surface. When it is close to 0° (for example, <5°), the material surface is super-hydrophilic; when θ>90°, the material is considered to be hydrophobic, that is, the liquid is not easy to wet the solid surface. When θ≥150°, the material surface is super-hydrophobic.

[0048] Superhydrophilic surface can form a water film on the solid surface, so pollutants are not easily attached to the solid surface, and pollutants can be easily removed under the flushing of water. Superhydrophobic surface can make water droplets on the solid surface close to spherical, and pollutants can be carried away by rolling water droplets.

[0049] The superhydrophobic property is determined by the chemical composition and roughness of the material surface. Low surface energy and appropriate roughness are two indispensable factors for preparing superhydrophobic surfaces. Therefore, the construction of superhydrophobic surfaces generally involves more complex production processes, including etching, imprinting, electrospinning, electrochemical oxidation, etc. The production equipment is expensive and the raw material prices are high, making it difficult to achieve the transformation from laboratory preparation to large-scale production applications. Relatively speaking, superhydrophilic-based oil-proof products are simple to prepare and easier to industrialize and put into use.

[0050] In one aspect of the present application, a super hydrophilic-oleophobic coating composition is provided, which comprises an appropriate amount of an alcohol-soluble fluorocarbon resin, a water-soluble amino resin, a water-soluble fluorinated surfactant, an inorganic salt, a hydrophilic fumed silica and a solvent. The prepared super hydrophilic-oleophobic coating can effectively prevent the adhesion of oil stains, thereby solving the problem of the difficulty in cleaning heavy oil stains from the root. Moreover, after the oil stains are attached to the coating, the coating can be easily washed off underwater, thus avoiding long-term accumulation and deterioration to form paint-like stains that are difficult to remove, thereby achieving a dual anti-fouling effect.

[0051] In some embodiments, the superhydrophilic-oleophobic coating composition comprises, by weight percentage:

[0052]

[0053] Alcohol-soluble fluorocarbon resins include compounds having the following structures:

[0054]

[0055] Wherein, n is 11 to 20, m is 2 to 6, and x is 3 to 8;

[0056] The mass concentration of the alcohol-soluble fluorocarbon resin is 40% to 60%.

[0057] In some embodiments, the solid content of the super hydrophilic-oleophobic coating composition is 6% to 14%, further 8% to 12%, further 9% to 10%.

[0058] Optionally, the solvent in the super hydrophilic-oleophobic coating composition is selected from an alcohol solvent. Further, the alcohol solvent is the same as the solvent in the alcohol-soluble fluorocarbon resin, which is conducive to forming a stable coating system.

[0059] In some embodiments, the solvent is ethanol.

[0060] In some embodiments, the super hydrophilic-oleophobic coating composition includes, by weight percentage, 6% to 12% alcohol-soluble fluorocarbon resin, 2% to 4% water-soluble amino resin, 0.3% to 0.5% water-soluble fluorinated surfactant, 0.6% to 1% inorganic salt, 0.8% to 1% hydrophilic fumed silica, and 80% to 91% solvent.

[0061] In some embodiments, the superhydrophilic-oleophobic coating composition comprises, by weight percentage:

[0062]

[0063]

[0064] In some embodiments, the alcohol-soluble fluorocarbon resin is prepared by the following preparation steps:

[0065] Mixing hexafluorobutyl acrylate monomer, hydroxyethyl methacrylate monomer and acrylic acid monomer in a molar ratio of 1: (0.1-0.55): (0.15-0.73) to obtain a monomer mixture;

[0066] An initiator and ethanol are added to the monomer mixture and mixed, and the obtained mixture is heated to 70° C. to 90° C. for reaction to obtain an alcohol-soluble fluorocarbon resin.

[0067] In some embodiments, in the step of preparing the alcohol-soluble fluorocarbon resin, the initiator accounts for 0.8% to 0.12% of the total weight of the monomer mixture.

[0068] In some embodiments, in the step of preparing the alcohol-soluble fluorocarbon resin, the initiator includes azobisisobutyronitrile.

[0069] In some embodiments, in the step of preparing the alcohol-soluble fluorocarbon resin, the reaction time is 2 hours to 5 hours.

[0070] In some embodiments, the water-soluble amino resin includes at least one of the following features:

[0071] 1) Solid content is 80% to 90%,

[0072] 2) The non-volatile content is 80±2%,

[0073] 3) The viscosity is 2000mPa·s to 5000mPa·s.

[0074] In some embodiments, the water-soluble amino resin includes at least one of Cymel 325 and Cymel 385.

[0075] In some embodiments, the water-soluble fluorinated surfactant comprises a solid content selected from 25% to 30%.

[0076] In some embodiments, the water-soluble fluorinated surfactant includes at least one of Capstone FS-50, Capstone FS-10, and Capstone FS-31.

[0077] In some embodiments, the inorganic salt includes at least one of aluminum dihydrogen phosphate, aluminum phosphate, and sodium silicate.

[0078] In another aspect of the present application, it relates to a method for preparing a super hydrophilic-oleophobic coating composition, which can be used to prepare the super hydrophilic-oleophobic coating composition described in any of the above technical solutions.

[0079] In some embodiments, the method for preparing the super hydrophilic-oleophobic coating composition comprises the following steps:

[0080] Prepare various raw materials according to the formula of the super hydrophilic-oleophobic coating composition described in any of the above technical solutions;

[0081] The hydrophilic fumed silica, the inorganic salt and the ethanol in a prescribed amount are mixed, and then the alcohol-soluble fluorocarbon resin, the water-soluble amino resin and the water-soluble fluorine-containing surfactant are added and mixed.

[0082] In yet another aspect of the present application, it relates to a super hydrophilic-oleophobic coating, which is prepared by using the super hydrophilic-oleophobic coating composition described above.

[0083] In some embodiments, the steps of preparing the super hydrophilic-oleophobic coating include:

[0084] The super hydrophilic-oleophobic coating composition is distributed on a solid surface in a suitable manner and dried.

[0085] In yet another aspect of the present application, it relates to a coated product, the surface coating of which is the super hydrophilic-oleophobic coating described above.

[0086] The superhydrophilic-oleophobic coating composition and coated product of the present application are suitable for kitchens. For example, they can be used to form coatings on the surfaces of objects such as tiles, doors and windows, suspended ceilings, cabinets, etc. in the kitchen. They can also be used to prepare kitchen utensils with the superhydrophilic-oleophobic coating, such as oil bottles, seasoning pots, pot lids, range hoods, etc., which effectively prevent and control the adhesion of oil stains, are easy to clean, have low production costs, are easy to prepare, and can be mass-produced and applied.

[0087] The following are some specific embodiments.

[0088] For experimental parameters not specified in the following specific embodiments, reference is made to the instructions given in the present application document, and reference may also be made to experimental manuals in the art or other experimental methods known in the art, or to experimental conditions recommended by manufacturers.

[0089] The raw materials and reagents involved in the following specific examples can be obtained from commercial sources, or can be prepared by those skilled in the art according to known methods.

[0090] Example 1

[0091] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.1:0.15, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0092] Subsequently, at room temperature and pressure, 0.8% by mass of hydrophilic fumed silica particles, 0.6% by mass of aluminum dihydrogen phosphate, and 90.3% by mass of ethanol are first added to the batching tank in sequence; after stirring and dispersing evenly, 6% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 2% by mass of Cymel325 amino resin (85%), and 0.3% by mass of Capstone FS-50 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, the mixture is allowed to cool, and then filtered to obtain a milky white coating.

[0093] Example 2

[0094] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.55:0.73, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0095] Subsequently, at room temperature and pressure, 1.0% by mass of hydrophilic fumed silica particles, 1.0% by mass of aluminum phosphate, and 81.5% by mass of ethanol were added to the batching tank in sequence; after stirring and dispersing evenly, 12% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 4% by mass of Cymel 385 amino resin (85%), and 0.5% by mass of Capstone FS-10 fluorinated surfactant (27%) were added in sequence; stirring was then continued until completely and evenly dispersed, allowed to cool, and then filtered to obtain a milky white coating.

[0096] Example 3

[0097] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate / hydroxyethyl methacrylate / acrylic acid in a molar ratio of 1:0.3:0.4 and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor and stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0098] Subsequently, at room temperature and pressure, 0.9% by mass of hydrophilic fumed silica particles, 0.8% by mass of sodium silicate, and 85.9% by mass of ethanol are first added to a batching tank in sequence; after stirring and dispersing evenly, 9% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 3% by mass of Cymel 325 amino resin (85%), and 0.4% by mass of Capstone FS-31 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, the mixture is allowed to cool, and then filtered to obtain a milky white coating.

[0099] Comparative Example 1

[0100] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.4:0.6, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0101] Subsequently, at room temperature and pressure, 0.85% by mass of hydrophilic fumed silica particles and 88.27% by mass of ethanol were added to the batching tank in sequence; after stirring and dispersing evenly, 8% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 2.5% by mass of Cymel 325 amino resin (85%), and 0.38% by mass of Capstone FS-50 fluorinated surfactant (27%) were added in sequence; stirring was then continued until completely and evenly dispersed, allowed to cool, and then filtered to obtain a milky white coating.

[0102] Comparative Example 2

[0103] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.1:0.15, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0104] Subsequently, at room temperature and pressure, 0.8% by mass of hydrophilic fumed silica particles, 0.6% by mass of aluminum dihydrogen phosphate, and 86.3% by mass of ethanol are first added to a batching tank in sequence; after stirring and dispersing evenly, 6% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 6% by mass of CYMEL 327 (25%), and 0.3% by mass of Capstone FS-50 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, allowed to cool, and then filtered to obtain a milky white coating.

[0105] Comparative Example 3

[0106] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.1:0.15, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0107] Subsequently, at room temperature and pressure, 0.8% by mass of hydrophilic fumed silica particles, 0.6% by mass of aluminum dihydrogen phosphate, and 84.3% by mass of ethanol are first added to the batching tank in sequence; after stirring and dispersing evenly, 6% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 8% by mass of CYMEL 327 (35%), and 0.3% by mass of Capstone FS-50 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, allowed to cool, and then filtered to obtain a milky white coating.

[0108] Comparative Example 4

[0109] At room temperature and pressure, 0.9% by mass of hydrophilic fumed silica particles, 0.8% by mass of sodium silicate, and 85.9% by mass of ethanol are first added to a batching tank in sequence; after stirring and dispersing evenly, 9% by mass of PVDF resin emulsion (50%), 3% by mass of Cymel 325 amino resin (85%), and 0.4% by mass of Capstone FS-31 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, the mixture is allowed to cool, and then filtered to obtain a milky white coating.

[0110] Comparative Example 5

[0111] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.3:0.4, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0112] Subsequently, at room temperature and pressure, 0.9% by mass of hydrophilic fumed silica particles, 0.8% by mass of sodium silicate, and 85.9% by mass of ethanol are first added to a batching tank in sequence; after stirring and dispersing evenly, 9% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 3% by mass of Cymel 325 amino resin (85%), and 0.4% by mass of OP-10 (40%) are added in sequence; stirring is then continued until completely and evenly dispersed, the mixture is allowed to cool, and then filtered to obtain a milky white coating.

[0113] Comparative Example 6

[0114] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.1:0.15, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0115] Subsequently, at room temperature and pressure, 0.8% by mass of hydrophilic fumed silica particles, 1.2% by mass of aluminum dihydrogen phosphate, and 89.7% by mass of ethanol were first added to the batching tank in sequence; after stirring and dispersing evenly, 6% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 2% by mass of Cymel325 amino resin (85%), and 0.3% by mass of Capstone FS-50 fluorinated surfactant (27%) were added in sequence; stirring was then continued until completely and evenly dispersed, allowed to cool, and then filtered to obtain a milky white coating.

[0116] Comparative Example 7

[0117] First, an alcohol-soluble fluorocarbon resin is prepared according to the following steps: hexafluorobutyl acrylate, hydroxyethyl methacrylate and acrylic acid in a molar ratio of 1:0.1:0.15, and 1% of the total monomer mass of azobisisobutyronitrile are added to a certain amount of ethanol to prepare an ethanol solution with a total monomer mass concentration of 50%, the ethanol solution with a mass concentration of 50% is added to a reactor, stirred, heated to 80°C for 3 hours, and then cooled for standby use, thereby synthesizing an alcohol-soluble fluorocarbon resin with a mass concentration of 50%.

[0118] Subsequently, at room temperature and pressure, 2% by mass of hydrophilic fumed silica particles, 0.6% by mass of aluminum dihydrogen phosphate, and 87.1% by mass of ethanol are first added to a batching tank in sequence; after stirring and dispersing evenly, 8% by mass of the alcohol-soluble fluorocarbon resin (50%) prepared above, 2% by mass of Cymel 325 amino resin (85%), and 0.3% by mass of Capstone FS-50 fluorinated surfactant (27%) are added in sequence; stirring is then continued until completely and evenly dispersed, the mixture is allowed to cool, and then filtered to obtain a milky white coating.

[0119] Performance Testing:

[0120] Sample preparation:

[0121] (1) The slide glass is washed with hot water and degreased twice at 60°C (the first wash is with tap water and the second wash is with pure water) to obtain a pretreated slide glass.

[0122] (2) The super hydrophilic oleophobic coating material with a thickness of 6 μm was sprayed on the pretreated surface of the glass slide by using an electrostatic hanging cup spraying, and then dried at a high temperature of 150° C. to obtain a sample to be tested.

[0123] Test Results

[0124] (1) Film appearance: Visually observe the coating uniformity, flatness, glossiness, and whether there are any undesirable phenomena such as condensation, particles, warping, and shedding.

[0125] (2) Water contact angle: Use a contact angle tester to test the water contact angle of the coating in air;

[0126] (3) Oil contact angle: The oil contact angle of the coating in air was tested using a contact angle tester; the oil used in the test was commercially available Luhua peanut oil.

[0127] The super hydrophilic oleophobic coatings provided in Examples 1-4 were tested according to the above test method, and the specific performance test results are shown in Table 1:

[0128] Table 1 Performance test results

[0129] performance Film appearance Water contact angle / ° Oil contact angle / ° Example 2 Uniform, smooth, no polycondensation ＜1 83 Example 3 Uniform, smooth, no polycondensation ＜1 82 Example 4 Uniform, smooth, no polycondensation ＜1 86 Comparative Example 1 Uniform, smooth, no polycondensation 35 65 Comparative Example 2 Condensation, warping ＜1 57 Comparative Example 3 Condensation, warping ＜1 56 Comparative Example 4 Condensation, warping, and shedding 72 79 Comparative Example 5 Uniform, smooth, no polycondensation 67 45 Comparative Example 6 Condensation, warping ＜1 90 Comparative Example 7 Powder and shedding on the surface ＜1 150

[0130] According to the data in Table 1, it can be seen that the film-forming appearance of the surface of the kitchenware material provided by the present invention is good overall, the coating is uniform and smooth, the glossiness is high, and there is no undesirable phenomenon such as polycondensation, particles, warping, and shedding. The coating has excellent super-hydrophilic and oleophobic properties, and the oil stains on the surface of the coating, especially the heavy oil stains, are easier to clean under water. However, the formula of the comparative example has poor overall performance due to the replacement of other raw materials or the ratio is not in the appropriate range, and cannot achieve the excellent effect of the coating of the present application.

[0131] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference separately. Unless they conflict with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited with all contents and all purposes. When the cited documents are involved in this application, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the cited documents are involved in this application, the examples and preferred methods of the cited relevant technical features can also be incorporated into this application as references, but are limited to the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, the present application shall prevail or be modified adaptively according to the description of this application.

[0132] The technical features of the above-mentioned implementation modes and examples can be combined in any appropriate manner. To make the description concise, not all possible combinations of the technical features in the above-mentioned implementation modes and examples are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-described embodiments only express several implementation methods of the present application, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application. In addition, it should be understood that after reading the above-mentioned teaching content of the present application, those skilled in the art can make various changes or modifications to the present application, and the equivalent forms obtained also fall within the protection scope of the present application. It should also be understood that the technical solutions obtained by those skilled in the art on the basis of the technical solutions provided in the present application through logical analysis, reasoning or limited experiments are all within the protection scope of the claims attached to the present application. Therefore, the protection scope of the patent of the present application shall be based on the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A super hydrophilic-oleophobic coating composition, characterized in that: The content by weight percentage includes: The alcohol-soluble fluorocarbon resin includes a compound having the following structure: Wherein, n is 11 to 20, m is 2 to 6, and x is 3 to 8; The solid content of the alcohol-soluble fluorocarbon resin is 40% to 60%; The alcohol-soluble fluorocarbon resin is prepared by a method comprising the following preparation steps: Mixing hexafluorobutyl acrylate monomer, hydroxyethyl methacrylate monomer and acrylic acid monomer in a molar ratio of 1: (0.1-0.55): (0.15-0.73) to obtain a monomer mixture; An initiator and an alcohol are added to the monomer mixture and mixed, and the obtained mixture is heated to 70° C. to 90° C. for reaction to obtain the alcohol-soluble fluorocarbon resin.

2. The super hydrophilic-oleophobic coating composition according to claim 1, characterized in that: The solid content of the super hydrophilic-oleophobic coating composition is 6%-14%.

3. The super hydrophilic-oleophobic coating composition according to claim 1, characterized in that: In the preparation steps of the alcohol-soluble fluorocarbon resin: The initiator accounts for 0.8% to 0.12% of the total weight of the monomer mixture; and / or The initiator comprises azobisisobutyronitrile; and / or The reaction time is 2h to 5h.

4. The super hydrophilic-oleophobic coating composition according to any one of claims 1 to 3, characterized in that: The water-soluble amino resin includes at least one of the following characteristics: 1) Mass concentration is 80% to 90%, 2) The non-volatile content is 80±2%, 3) The viscosity is 2000mPa·s to 5000mPa·s.

5. The super hydrophilic-oleophobic coating composition according to claim 4, characterized in that: The water-soluble amino resin includes at least one of Cymel 325 and Cymel 385.

6. The super hydrophilic-oleophobic coating composition according to any one of claims 1 to 3, characterized in that: The water-soluble fluorinated surfactant comprises at least one of Capstone FS-50, Capstone FS-10 and Capstone FS-31; and / or The inorganic salt includes at least one of aluminum dihydrogen phosphate, aluminum phosphate and sodium silicate.

7. A super hydrophilic-oleophobic coating, characterized in that: The super hydrophilic-oleophobic coating composition is prepared from the super hydrophilic-oleophobic coating composition described in claims 1 to 6.

8. The method for preparing the super hydrophilic-oleophobic coating according to claim 7, characterized in that: The steps include: Prepare various raw materials according to the formula of the super hydrophilic-oleophobic coating composition according to any one of claims 1 to 6; The hydrophilic fumed silica, the inorganic salt and the solvent are mixed in a formula amount, and then the alcohol-soluble fluorocarbon resin, the water-soluble amino resin and the water-soluble fluorinated surfactant are added and mixed to prepare a super hydrophilic-oleophobic coating composition; The super hydrophilic-oleophobic coating composition is distributed on a solid surface and dried to obtain the super hydrophilic-oleophobic coating.

9. A coated product, characterized in that Its surface coating is the super hydrophilic-oleophobic coating described in claim 7.

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