Coating, method of preparation and use

Abstract

This invention discloses a coating, its preparation method, and its application, relating to the field of coating preparation technology. The coating comprises a base component and a curing agent component; the raw materials of the base component include fluorinated nano-silica particles and acrylate compounds; wherein the raw materials of the fluorinated nano-silica particles include nano-silica particles and a modifier, the modifier including fluorosilanes and long-chain alkylsilanes. The coating obtained by this invention forms a coating with strong hydrophobic and oleophobic properties and easy cleaning effect. Furthermore, the preparation method of this coating is simple, it has good workability, and it exhibits good adhesion to the surface of household appliance panels. The mechanical properties and weather resistance of the coating meet the requirements of daily use.

Description

Technical Field

[0001] This invention relates to the field of coating preparation technology, and in particular to a coating, a preparation method, and its application. Background Technology

[0002] With economic and social development and the continuous improvement of people's living standards, consumers have increasingly higher requirements for the cleanability of everyday appliances. For example, during the use of air conditioners, the air conditioner panel and the inner surfaces that consumers can open and touch are easily stained with oil and other dirt. Traditional air conditioner panel and inner surface coatings have poor oleophobicity, making it difficult to easily remove oil and other dirt from the air conditioner panel or inner surface using conventional cleaning methods. Using strong alkaline cleaners or high-hardness cleaning products such as steel wool can easily lead to scratches and corrosion, thus affecting the appearance of the air conditioner and causing considerable trouble for consumers. Summary of the Invention

[0003] The main objective of this invention is to develop an environmentally friendly and harmless coating. The coating forms a layer with strong hydrophobic and oleophobic properties and is easy to clean. At the same time, the preparation method of the coating is simple, it has good workability, and it has good adhesion to the surface of household appliance panels. The mechanical properties and weather resistance of the coating can meet the requirements of daily use.

[0004] To achieve the above objectives, the present invention provides a coating comprising a paint base component and a curing agent component; the paint base component comprises the following raw materials in parts by weight: fluorinated nano-silica particles: 1-2 parts; acrylate compounds: 30-40 parts; wherein the raw material of the fluorinated nano-silica particles comprises nano-silica particles and a modifier, the modifier comprising fluorosilanes and long-chain alkylsilanes.

[0005] In one embodiment, the fluorosilane includes at least one of perfluoroalkyltrimethoxysilane and perfluoroalkyltriethoxysilane.

[0006] In one embodiment, the perfluoroalkyltrimethoxysilane includes at least one of perfluorooctyltrimethoxysilane, perfluorodecyltrimethoxysilane, perfluorotetradecyltrimethoxysilane, and perfluoroheptadecyltrimethyloxysilane.

[0007] In one embodiment, the perfluoroalkyltriethoxysilane includes at least one of perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, perfluorotetradecyltriethoxysilane, and perfluoroheptadecanetriethyloxysilane.

[0008] In one embodiment, the long-chain alkylsilane includes at least one of long-chain alkyltrimethoxysilane and long-chain alkyltriethoxysilane.

[0009] In one embodiment, the long-chain alkyltrimethoxysilane includes at least one of n-octyltrimethoxysilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane, and docosyltrimethoxysilane.

[0010] In one embodiment, the long-chain alkyltriethoxysilane includes at least one of n-octyltriethoxysilane, dodecyltriethoxysilane, hexadecyltriethoxysilane, octadecyltriethoxysilane, and docosyltriethoxysilane.

[0011] In one embodiment, the modifier further includes alkenylsilane.

[0012] In one embodiment, the alkenylsilane includes at least one of vinyltrimethoxysilane, vinyltriethoxysilane, propenyltrimethoxysilane, propenyltriethoxysilane, 5-hexenyltrimethoxysilane, 5-hexenyltriethoxysilane, 7-octenyltrimethoxysilane, 7-octenyltriethoxysilane, 10-dodecenyltrimethoxysilane, 10-dodecenyltriethoxysilane, 18-octadecenyltrimethoxysilane, 18-octadecenyltriethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, and 3-methacryloyloxypropyltriethoxysilane.

[0013] In one embodiment, the weight ratio of the fluorosilane, long-chain alkylsilane and alkenylsilane in the modifier is (3-5):(1-3):(1-2).

[0014] In one embodiment, the weight ratio of the fluorosilane to the nano-silica particles in the fluorinated nano-silica particles is (3-5):1.

[0015] In one embodiment, the acrylate compound includes a soft component, a hard component, and a functional component, wherein the weight ratio of the soft component, the hard component, and the functional component is (25-40):(5-10):(1-5); wherein the soft component is an acrylate containing a long alkyl chain; the hard component is an acrylate containing a short alkyl chain; and the functional component is an acrylate containing a functional group.

[0016] In one embodiment, the paint base component further includes 5 to 10 parts by weight of fluorine-modified acrylic resin.

[0017] In one embodiment, the fluorinated acrylic resin comprises acrylates modified with fluoroalkyl chains.

[0018] In one embodiment, the paint base component further includes the following raw materials in parts by weight: surfactant: 0.2 to 1 part; silane coupling agent: 0.1 to 2 parts; defoamer: 0.1 to 0.5 parts; organic solvent: 30 to 55 parts by weight.

[0019] In one embodiment, the raw materials of the coating further include auxiliary components; wherein the auxiliary components include the following raw materials in parts by weight: ultraviolet absorber: 1-2 parts; light stabilizer: 0.5-1 part; leveling agent: 0.1-0.5 parts; solvent: 60-110 parts.

[0020] In one embodiment, the weight ratio of the paint base component, the curing agent component, and the additive component in the coating is (40-50):(5-10):(10-50).

[0021] This application also proposes a method for preparing a coating, the method comprising the following steps:

[0022] S10. Disperse nano-silica particles in a solvent, adjust the pH to alkaline, add a modifier, react, adjust the pH to neutral or weakly acidic, let stand, filter to obtain a sol, dry, and obtain fluorinated nano-silica particles.

[0023] S20. Add the organic solvent to the reaction vessel and stir. Add the acrylate compound and stir to dissolve. Add the fluorinated nano-silica particles obtained in step S10 and disperse them evenly. Let stand, filter and take the filtrate to obtain the paint base component.

[0024] S30. The curing agent component and the paint base component obtained in step S20 are mixed according to the specified ratio to obtain the coating.

[0025] In one embodiment, step S20 specifically includes: adding an organic solvent to a reaction vessel and stirring; adding a soft component and stirring at low speed for 5-10 minutes; adding a functional component and a hard component while stirring at low speed and stirring at medium speed for 10-20 minutes; adding a fluorinated modified acrylic resin while stirring at medium speed and stirring at medium speed for 10-15 minutes until completely dissolved; then adding the fluorinated nano-silica particles obtained in step S10 while stirring at low speed to ensure uniform dispersion; allowing to stand; filtering and collecting the filtrate to obtain the paint base component.

[0026] In one embodiment, the step between step S20 and step S30 further includes:

[0027] S21. Add isocyanate curing agent and solvent to the reaction vessel, stir and disperse to obtain curing agent component;

[0028] S22. Add ultraviolet absorber, light stabilizer, leveling agent and solvent to the reaction vessel, stir at low speed to medium-high speed, let stand, and obtain the auxiliary component.

[0029] In one embodiment, in step S30, the paint base component obtained in step S20, the curing agent component obtained in step S21, and the additive component obtained in step S22 are mixed in a certain proportion to obtain the coating.

[0030] This application also proposes a household appliance that uses the coating.

[0031] In one embodiment, the household appliance includes an air conditioner, and the coating is formed on the panel surface of the air conditioner by a thermal crosslinking curing process to form a hydrophobic and oleophobic coating.

[0032] The technical solution of this invention designs a coating using modified nano-silica particles as fillers and acrylic resin as the main paint base component, reducing environmental pollution and construction toxicity issues. Through the rational selection and proportioning of soft, functional, and hard components in the paint base component, the coating formed possesses advantages such as good toughness, high hardness, and chemical corrosion resistance. The introduction of fluorinated modified acrylic resin into the paint base component further enhances the hydrophobic and oleophobic properties of the coating, making it easier to clean and maintain. Using modified grafted nano-silica particles as the main filler further improves the coating's hydrophobicity, oleophobicity, abrasion resistance, and mechanical strength. The large specific surface area and unique surface properties of the nano-silica particles enhance the coating's functionality. During the preparation and application of the coating, the rational selection and proportioning of additives ensure that the mechanical properties and weather resistance of the coating meet daily use requirements, while also ensuring the coating's spreadability and uniformity, resulting in a high-quality surface that meets aesthetic requirements. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a flowchart illustrating the preparation process of the paint base component in Example 1;

[0035] Figure 2 This is a flowchart illustrating the preparation process of the curing agent component in Example 1;

[0036] Figure 3This is a flowchart of the preparation and application process of the coating in Example 1.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] The technical problem this application solves is that currently, the surface and interior of air conditioner and other household appliances are easily stained with oil and other dirt. The oil and dirt have a strong adhesion to the panel, and the coatings on traditional panels or interior surfaces have poor oleophobicity. As a result, conventional cleaning methods cannot easily remove the oil and other dirt. Using strong alkaline cleaners or high-hardness cleaning products such as steel wool can easily lead to scratches and corrosion, which affects the appearance of the air conditioner and causes great trouble for consumers.

[0042] To address the aforementioned technical issues, a specialized coating has been designed for the panels and inner surfaces of air conditioners and other household appliances prone to oil stains. This coating forms an easy-to-clean layer, effectively preventing the adhesion of oil and other stains to the surfaces of household appliances, making daily cleaning of air conditioners and other household appliances simpler and more convenient for consumers.

[0043] This invention proposes a coating comprising a paint base component and a curing agent component; the paint base component comprises the following raw materials in parts by weight: fluorinated nano-silica particles: 1-2 parts; acrylate compounds: 30-40 parts; wherein the raw material of the fluorinated nano-silica particles comprises nano-silica particles and a modifier, the modifier comprising fluorosilanes and long-chain alkylsilanes.

[0044] Specifically, the amount of fluorinated nano-silica particles in the paint base component of the present invention can be 1 part, 1.1 parts, 1.3 parts, 1.4 parts, 1.6 parts or 2 parts, and any amount within the above range is acceptable.

[0045] Specifically, the amount of acrylate compound in the paint base component of the present invention can be 30 parts, 30.5 parts, 31 parts, 32 parts, 35 parts or 40 parts, and any amount within the above range is acceptable.

[0046] It should be noted that the main components of the paint base in this invention include fillers composed of fluorinated nano-silica particles and acrylate resin base material copolymerized from acrylate compounds. In this invention, fluorosilanes and long-chain alkylsilanes are used to graft and modify the nano-silica particles. Fluorosilanes graft fluorine-containing long-chain silane groups onto the nano-silica particles, thereby giving them strong hydrophobic and oleophobic properties. The modified nano-silica particles can be stably and uniformly dispersed in the paint base, whose main component is water-based acrylate, due to the action of other additives. When the paint is made into a coating and forms a coating layer, under thermodynamic action, the nano-silica particles grafted with fluorine-containing long-chain silane groups are more likely to diffuse towards the coating surface, giving the coating strong hydrophobic and oleophobic properties and easy cleaning. Long-chain alkylsilanes have similar properties to fluorosilanes and can similarly enhance the hydrophobic and oleophobic properties of the coating. It should also be noted that the coating in this invention uses acrylate polymer resin as a base material. The compounding of acrylate compounds determines the glass transition temperature (Tg) and other properties of the acrylate copolymer, which in turn determines the toughness, chemical resistance and mechanical strength of the coating.

[0047] It should also be noted that by controlling the amount of fluorinated nano-silica particles and acrylate compounds within the above-mentioned range, the resulting coating has good hydrophobicity and oleophobicity, making it easier to clean. At the same time, the coating also has good wear resistance, weather resistance, and high hardness. When the amount of fluorinated nano-silica particles is excessive, the proportion of filler in the coating is too high, and the adhesion of the matrix resin is insufficient, which will affect the adhesion between the coating and the substrate surface. When the amount of fluorinated nano-silica particles is insufficient, the hydrophobic and oleophobic properties of the coating cannot achieve the expected technical effect.

[0048] In one embodiment, the weight ratio of the fluorinated nano-silica particles to the modifier in the fluorinated nano-silica particles is (1-3.5):(5-10). Specifically, the weight ratio of the nano-silica particles to the modifier in the fluorinated nano-silica particles of the present invention can be 1:5, 1:6, 1:8, 1:10, 2:8, 2:10, 3.5:5, 3.5:6, or 3.5:10, and any ratio falling within the above range is acceptable.

[0049] It should be noted that, through long-term research during the preparation of coatings, the inventors have found that the amount of modifier in the raw materials of the fluorinated nano-silica particles has a significant impact on the performance of the resulting coating. When the amount of modifier is too small, the silane coupling agent grafted onto the surface of the nano-silica particles is insufficient, which easily leads to agglomeration, resulting in poor dispersion of the nano-silica particles and thus poor uniformity and stability of the silica sol. This affects the uniformity and stability of the coating, easily causing pinholes, bubbles, or other defects in the coating, and also weakens the adhesion of the coating to the substrate surface. When the modifier is excessive, the excess coupling agent will form a thick organic layer at the interface between the nano-silica particles and the resin matrix, which will reduce the mechanical strength of the coating. At the same time, the excessive coupling agent contains more active groups, which can lead to the hydrolysis of silanes or even the hydrolysis of acrylate polymers in the resin matrix, thereby accelerating the aging and decomposition of the coating, reducing the elasticity of the coating, and causing the coating to crack. In addition, the use of excessive coupling agent will significantly increase the production cost.

[0050] It should also be noted that, through long-term research during the preparation of the coating, the inventors have found that the amount of nano-silica particles in the raw material of the fluorinated nano-silica particles has a significant impact on the performance of the coating. When the amount of nano-silica particles is too small, the proportion of filler in the coating is significantly reduced, which seriously affects the functionality of the coating, causing a significant decrease in its hydrophobic and oleophobic properties as well as its mechanical properties, thus preventing the silane coupling agent composition from exerting its corresponding modification effect. When the amount of nano-silica particles is excessive, agglomeration is likely to occur, and the nano-silica particles tend to aggregate, thereby affecting the uniformity and stability of the coating, easily leading to pinholes, bubbles, or other defects in the coating, weakening the adhesion of the coating to the substrate surface, and affecting the service life of the coating.

[0051] In one embodiment, the fluorosilane includes at least one of perfluoroalkyltrimethoxysilane and perfluoroalkyltriethoxysilane. It should be noted that perfluoroalkyltrimethoxysilane is an important class of silane coupling agents, with the general chemical formula (CF3(CF2)). n The formula is (CF3(CF2)n)Si(OC2H5)3, where n represents the length of the perfluoroalkyl chain. Perfluoroalkyl trimethoxysilanes possess extremely low surface energy, imparting excellent hydrophobicity and oleophobicity to material surfaces, making them suitable for oil- and stain-resistant applications. They also exhibit excellent chemical stability, resisting most acids, alkalis, and organic solvents, making them suitable for harsh chemical environments. Furthermore, they possess high thermal stability, maintaining their properties at high temperatures. Similarly, perfluoroalkyl triethoxysilanes are also important silane coupling agents, possessing similar chemical properties to perfluoroalkyl trimethoxysilanes. Their general chemical formula is (CF3(CF2)n)Si(OC2H5)3, where n represents the length of the perfluoroalkyl chain.

[0052] In one embodiment, the perfluoroalkyltrimethoxysilane comprises perfluorooctyltrimethoxysilane (1H,1H,2H,2H-Perfluorooctyltrimethoxysilane, chemical formula (C8F)). 13 )-Si(OCH3)3), perfluorodecyltrimethoxysilane (1H,1H,2H,2H-Perfluorodecyltrimethoxysilane, chemical formula (C 10 F 17 )-Si(OCH3)3), perfluorotetradecyltrimethoxysilane (1H,1H,2H,2H-Perfluorotetradecyltrimethoxysilane, chemical formula (C 14 F 25)-Si(OCH3)3), perfluorodecyltrimethoxysilane (1H,1H,2H,2H-Perfluorodecyltrimethoxysilane, chemical formula (C 17 F 31 At least one of )-Si(OCH3)3).

[0053] In one embodiment, the perfluoroalkyltriethoxysilane comprises perfluorooctyltriethoxysilane (1H,1H,2H,2H-Perfluorooctyltriethoxysilane, chemical formula (C8F)). 13 )-Si(OC2H5)3), perfluorodecyltriethoxysilane (1H,1H,2H,2H-Perfluorodecyltriethoxysilane, chemical formula (C 10 F 17 )-Si(OC2H5)3), perfluorotetradecyltriethoxysilane (1H,1H,2H,2H-Perfluorotetradecyltriethoxysilane, chemical formula (C 14 F 25 )-Si(OC2H5)3), perfluoroheptadecyltriethoxysilane (1H,1H,2H,2H-Heptadecafluorodecyltriethoxysilane, chemical formula (C 17 F 31 At least one of )-Si(OC2H5)3).

[0054] In one embodiment, the long-chain alkylsilane includes at least one of long-chain alkyltrimethoxysilane and long-chain alkyltriethoxysilane. It should be noted that long-chain alkyltrimethoxysilane is a common silane coupling agent with the general chemical formula R-Si(OCH3)3, where R represents a long-chain alkyl group; the long-chain alkyl group of the long-chain alkylsilane described in this invention has at least 8 carbon atoms on its carbon chain. Long-chain alkyltrimethoxysilane is widely used in surface treatment, coatings, composite materials, etc., and its long-chain alkyl group has low surface energy, hydrophobicity, oleophobicity, and excellent chemical stability. Similarly, long-chain alkyltriethoxysilane is also a common silane coupling agent with similar chemical properties to long-chain alkyltrimethoxysilane, and the general chemical formula R-Si(OC2H5)3, where R represents a long-chain alkyl group; the long-chain alkyl group of the long-chain alkylsilane described in this invention has at least 8 carbon atoms on its carbon chain.

[0055] In one embodiment, the long-chain alkyltrimethoxysilane includes n-octyltrimethoxysilane (C8H4O2).17 )-Si(OCH3)3), dodecyltrimethoxysilane (chemical formula is (C 12 H 25 )-Si(OCH3)3), Hexadecyltrimethoxysilane (chemical formula: C 16 H 33 )-Si(OCH3)3), Octadecyltrimethoxysilane (C 18 H 37 )-Si(OCH3)3), docosyltrimethoxysilane (C 22 H 45 At least one of )-Si(OCH3)3).

[0056] In one embodiment, the long-chain alkyltriethoxysilane includes n-octyltriethoxysilane (C8H4O2). 17 )-Si(OC2H5)3), Dodecyltriethoxysilane (chemical formula is (C 12 H 25 )-Si(OC2H5)3), Hexadecyltriethoxysilane (chemical formula: C 16 H 33 )-Si(OC2H5)3), Octadecyltriethoxysilane (C 18 H 37 )-Si(OC2H5)3), docosyltriethoxysilane (C 22 H 45 At least one of )-Si(OC2H5)3).

[0057] In one embodiment, the modifier further includes alkenylsilane. It should be noted that alkenylsilane is an organosilicon compound containing a carbon-carbon double bond structure. In free radical polymerization, alkenylsilane can participate in the reaction as a functional component, thereby introducing siloxane groups onto the acrylate polymer chain and imparting corresponding physical or chemical properties to the acrylate resin base material. Furthermore, alkenylsilane can also react with active groups on the plastic panels of household appliances to form bonds, increasing the interfacial adhesion between the coating and the plastic panels of the household appliances, thereby improving the mechanical strength of the coating.

[0058] In one embodiment, the alkenylsilane includes vinyltrimethoxysilane (C2H3)-Si(OCH3)3, vinyltriethoxysilane (C2H3)-Si(OC2H5)3, propyltrimethoxysilane (C3H5)-Si(OCH3)3, triethoxyvinylsilane (C3H5)-Si(OC2H5)3, and 5-hexenyltrimethoxysilane (C6H5)-Si(OC2H5)3. 11 )-Si(OCH3)3), 5-Hexenyltriethoxysilane (C6H 11 )-Si(OC2H5)3), 7-octenyltrimethoxysilane (C8H 15 )-Si(OCH3)3), 7-octenyltriethoxysilane (C8H 15 )-Si(OC2H5)3), 10-dodecenyltrimethoxysilane (C 12 H 23 )-Si(OCH3)3), 10-dodecenyltriethoxysilane (chemical formula: C 12 H 23 )-Si(OC2H5)3), 18-octadecenyltrimethoxysilane (C 18 H 35)-Si(OCH3)3), 18-Octadecenyltriethoxysilane (C 18 H 35 )-Si(OC2H5)3), 3-methacryloxypropyltrimethoxysilane (C7H 11 O2)-Si(OCH3)3), 3-Methacryloxypropyltriethoxysilane (C7H) 11 At least one of O2)-Si(OC2H5)3).

[0059] In one embodiment, the weight ratio of the fluorosilane, long-chain alkylsilane, and alkenylsilane in the modifier is (3-5):(1-3):(1-2). Preferably, the weight ratio of the fluorosilane, long-chain alkylsilane, and alkenylsilane in the modifier is 3:2:1.

[0060] It should be noted that fluorosilane coupling agents provide excellent surface properties, long-chain alkylsilane coupling agents improve dispersibility and compatibility, while alkenylsilane coupling agents provide reactive crosslinking sites. This multi-component synergistic effect can significantly improve the overall performance of the coating without increasing costs excessively. The inventors prepared different coatings by controlling the ratio of various silane coupling agents in the modifier and formed coatings. They measured the hydrophobic angle, oleophobic angle, weather resistance, and mechanical strength of the coatings, and found that the above ratio represents the range of values ​​with the best overall performance. It should also be noted that, in order to ensure that the coating has sufficient hydrophobicity, oleophobicity, and low surface energy, a relatively large amount of fluorosilane coupling agent is needed to cover the surface of the nano-silica to obtain a uniform fluorinated layer; the CF bonds in the fluorosilane coupling agent are very stable and can effectively resist the erosion of ultraviolet rays, oxygen, and moisture, thus extending the service life of the coating. Alkenyl silane coupling agents are mainly used to introduce reactive carbon-carbon double bonds, enabling nano-silica particles to crosslink with reactive monomers (such as acrylates, methacrylates, etc.) in the acrylate resin base during subsequent polymerization reactions, thereby enhancing the mechanical strength and adhesion of the coating.

[0061] It should also be noted that when alkenylsilane coupling agents are used in excess, the carbon-carbon double bonds in the alkenylsilane coupling agent will be excessively crosslinked with the reactive monomers (such as acrylates, methacrylates, etc.) in the acrylate resin base, making the coating too rigid and reducing its flexibility and impact resistance. Therefore, the amount of alkenylsilane coupling agent used needs to be controlled at a low level.

[0062] Optionally, the particle size of the nano-silica particles is 1-100 nm; it is understood that the particle size of the nano-silica particles can be 20-50 nm or 50-80 nm; preferably, the particle size of the nano-silica particles is 20-50 nm.

[0063] It should be noted that the particle size of nano-silica particles, as the main filler in the coating of this invention, has a significant impact on the coating's performance. If the particle size of nano-silica particles is too small, the specific surface area will be too large, making agglomeration likely. Even with the use of silane coupling agents to improve dispersibility, agglomeration is still difficult to avoid with excessively small particle sizes. Too small a particle size will also reduce the mechanical properties of the coating, as particles with too small a particle size cannot effectively enhance the network structure of the matrix resin. Furthermore, a large specific surface area means more exposed active sites, making it more prone to hydrolysis, accelerating the aging rate of the coating, and significantly reducing its weather resistance and water resistance. If the particle size of nano-silica particles is too large, the specific surface area will be too small, resulting in a low grafting rate of the silane coupling agent on the surface of the nano-silica particles. This prevents the silane coupling agent composition from exerting its corresponding modification effect, thus failing to achieve the expected technical effects in terms of hydrophobic and oleophobic properties and mechanical properties. Too large a particle size will also reduce the viscosity of the coating, causing it to become thinner, difficult to coat evenly, or resulting in a noticeable grainy texture, as well as coating defects such as sagging and pinholes. Therefore, within the above particle size range, nano-silica particles can be dispersed relatively uniformly in the raw materials, resulting in a smooth surface of the coating without affecting other properties.

[0064] In one embodiment, during the preparation of the fluorinated nano-silica particles, the weight ratio of the fluorosilane to the nano-silica particles is (3-5):1. It is understood that the weight ratio of the fluorosilane to the nano-silica particles during the preparation of the fluorinated nano-silica particles can be 3:1, 3.1:1, 3.5:1, 4:1, or 5:1, and any ratio within the above range is acceptable. By reasonably controlling the weight ratio of the nano-silica particles and the fluorosilane in the modifier, the hydrophobic and oleophobic angles of the coating surface can be adjusted, enabling the coating to effectively prevent oil and other contaminants from adhering to the surface of household appliances such as air conditioners, and making it easy to clean.

[0065] In one embodiment, the acrylate compound comprises a soft component, a hard component, and a functional component, wherein the weight ratio of the soft component, hard component, and functional component is (25-40):(5-10):(1-5); preferably, the weight ratio of the soft component, hard component, and functional component in the acrylate compound is 16:3:1. The soft component is an acrylate containing a long alkyl chain; the hard component is an acrylate containing a short alkyl chain; and the functional component is an acrylate containing a functional group.

[0066] It should be noted that the soft component is an acrylate containing a long alkyl chain, which has good flexibility and a low glass transition temperature, wherein the long alkyl chain has 8 or more carbon atoms; the hard component is an acrylate containing a short alkyl chain, which has a high glass transition temperature and good rigidity and heat resistance, wherein the short alkyl chain has less than 8 carbon atoms; the functional component is an acrylate containing functional groups, wherein the functional groups include active groups such as carboxyl, hydroxyl, carbonyl, and aldehyde groups.

[0067] It should be noted that the coating in this invention uses acrylate polymer resin as the base material. The formulation of acrylate compounds determines the glass transition temperature (Tg) and other properties of the acrylate copolymer, which in turn determines the toughness, chemical resistance, and mechanical strength of the coating. It should also be noted that during the research and development process, the inventors discovered that when the ratio of acrylate compounds is inappropriate, the modified nano-silica particles have poor compatibility with the paint base components, resulting in a coating surface with noticeable bubbles, poor smoothness, and reduced hydrophobic and oleophobic properties.

[0068] In one embodiment, the paint base component further includes 5 to 10 parts by weight of fluorinated modified acrylic resin. It should be noted that the fluorinated modified acrylic resin is essentially a fluorinated acrylate compound. As a polar substance, it can participate in the copolymerization reaction of acrylate resins and can also be uniformly dispersed in the acrylate resin base, significantly improving the hydrophobic and oleophobic properties, weather resistance, and chemical corrosion resistance of the coating formed by the paint.

[0069] In one embodiment, the fluorinated modified acrylic resin comprises acrylates modified with fluoroalkyl chains. It should be noted that fluoroalkyl chain-modified acrylates are a class of organic compounds with special properties, containing fluoroalkyl chains and polymerizable double bonds. Fluoroalkyl chain-modified acrylates exhibit strong hydrophobicity and oleophobicity, as well as low surface energy. This characteristic allows fluoroalkyl chain-modified acrylates and their derived polymers to form very smooth surfaces, reducing the adhesion of dirt and other substances. Furthermore, these materials also exhibit good biocompatibility, making them suitable for preparing coatings for household appliances such as air conditioners.

[0070] In one embodiment, the paint base component further includes the following raw materials in parts by weight: 0.2 to 1 part surfactant, 0.1 to 2 parts silane coupling agent, 0.1 to 0.5 parts defoamer, and 30 to 55 parts organic solvent.

[0071] It should be noted that the surfactant in the paint base component of this invention is preferably a fluorocarbon surfactant; the silane coupling agent in the paint base component of this invention is preferably γ-methacryloyloxypropyltrimethoxysilane (KH-570); the defoamer in the paint base component of this invention is preferably an organosilicon defoamer; the organic solvent in the paint base component of this invention includes ether alcohol solvents and alcohol auxiliary solvents, the ether alcohol solvents include propylene glycol methyl ether, propylene glycol butyl ether, etc., and the alcohol auxiliary solvents include ethanol, isopropanol, etc., mainly used to adjust the viscosity, solubility and evaporation rate of the solution system.

[0072] In one embodiment, the raw materials of the coating further include auxiliary components; wherein the auxiliary components include the following raw materials in parts by weight: 1-2 parts of ultraviolet absorber, 0.5-1 part of light stabilizer, 0.1-0.5 parts of leveling agent, and 60-110 parts of solvent.

[0073] It should be noted that in this invention, the synergistic effect of light stabilizers and ultraviolet absorbers significantly improves the coating's resistance to ultraviolet aging, preventing fading and cracking of the coating after long-term exposure to sunlight; the leveling agent improves the surface smoothness of the coating, enhances its spreadability and uniformity, thereby obtaining a high-quality coating surface; this invention does not impose specific limitations on the types of ultraviolet absorbers, light stabilizers, and leveling agents.

[0074] In one embodiment, the weight ratio of the paint base component, the curing agent component, and the additive component in the coating is (40-50):(5-10):(10-50). Preferably, the weight ratio of the paint base component, the curing agent component, and the additive component in the coating is 45:5:50.

[0075] It should be noted that the curing agent in the coating is mainly used to promote the cross-linking reaction of the acrylic resin base. Excessive curing agent will lead to excessive cross-linking reaction, forming an overly dense cross-linking network. This will make the coating too rigid, losing some flexibility and elasticity, thus making the coating prone to cracking. If the amount of curing agent is too small, on the one hand, the cross-linking network of the acrylic resin base will not be dense enough, resulting in insufficient hardness and rigidity of the coating; on the other hand, the cross-linking between the coating and the substrate surface will be insufficient, weakening the adhesion. Excessive paint base components will increase the viscosity of the coating, leading to poor flowability during the coating process, making it difficult to coat evenly, prone to sagging and pinholes, and unable to cure completely, making the surface of the coating easily contaminated with dust and stains.

[0076] It should be noted that the curing agent components in this invention include isocyanate curing agents and organic solvents in a mass ratio of (1-10):(60-90); no specific restrictions are made on the types of isocyanate curing agents and organic solvents in this invention.

[0077] This invention also proposes a method for preparing the coating, specifically including the following steps:

[0078] S10. Disperse nano-silica particles in a solvent, adjust the pH to alkaline, add a modifier, react, adjust the pH to neutral or weakly acidic, let stand, filter to obtain a sol, dry, and obtain fluorinated nano-silica particles.

[0079] S20. Add the organic solvent to the reaction vessel and stir. Add the acrylate compound and stir to dissolve. Add the fluorinated nano-silica particles obtained in step S10 and disperse them evenly. Let stand, filter and take the filtrate to obtain the paint base component.

[0080] S30. The curing agent component and the paint base component obtained in step S20 are mixed according to the specified ratio to obtain the coating.

[0081] It should be noted that in step S10 of the present invention, an alkaline catalyst is used to adjust the pH to alkaline, causing the fluorosilane, long-chain alkylsilane or alkenylsilane in the modifier to hydrolyze, and then an acid is used to neutralize it, so as to obtain the modified nano silica particle sol.

[0082] In one embodiment, step S20 specifically includes: adding an organic solvent to a reaction vessel and stirring; adding a soft component and stirring at low speed for 5-10 minutes; adding a functional component and a hard component while stirring at low speed and stirring at medium speed for 10-20 minutes; adding a fluorinated modified acrylic resin while stirring at medium speed and stirring at medium speed for 10-15 minutes until completely dissolved; then adding the fluorinated nano-silica particles obtained in step S10 while stirring at low speed to ensure uniform dispersion; allowing to stand; filtering and collecting the filtrate to obtain the paint base component.

[0083] It should be noted that acrylate compounds are chemically reactive, and the dissolution rate or reaction rate should be carefully monitored during dissolution and reaction.

[0084] In one embodiment, the step between step S20 and step S30 further includes:

[0085] S21. Add isocyanate curing agent and solvent to the reaction vessel, stir and disperse to obtain curing agent component;

[0086] S22. Add ultraviolet absorber, light stabilizer, leveling agent and solvent to the reaction vessel, stir at low speed to medium-high speed, let stand, and obtain the auxiliary component.

[0087] In one embodiment, step S30 includes: mixing the paint base component obtained in step S20, the curing agent component obtained in step S21, and the additive component obtained in step S22 in a certain proportion to obtain the coating.

[0088] It is understood that in the preparation process of the coating of the present invention, the preparation processes of the paint base component, the curing agent component and the auxiliary component are all independent preparation processes, and there is no distinction in the order of their preparation.

[0089] The present invention also provides a household appliance, wherein the above-mentioned coating is applied.

[0090] In one specific embodiment, the household appliance includes an air conditioner, and the coating is formed on the panel surface of the air conditioner by a thermal crosslinking curing process to form a hydrophobic and oleophobic coating.

[0091] In one specific embodiment, the household appliance may also be a microwave oven, induction cooker, oven, bread maker, noodle maker, range hood, air fryer, pancake maker, humidifier, electric kettle, hair dryer, juicer, pressure cooker, rice cooker, water heater, computer, electric fan, electric frying pan, soy milk maker, speaker, stove, or refrigerator, etc.

[0092] In one embodiment, the coating is applied to the housing panel of a household appliance.

[0093] It is understood that the raw materials used in the preparation of the coating are not substances restricted or prohibited by domestic or international regulations, and no harmful substances are generated during the preparation process of the coating, making both the coating and the household appliances safe and environmentally friendly.

[0094] The present invention will be further illustrated below through specific embodiments:

[0095] This invention does not impose specific restrictions on the source of raw materials.

[0096] The sources of raw materials in the various embodiments of the present invention are as follows:

[0097] (1H,1H,2H,2H-perfluorotetradecyl)tri(ethoxy)silane, CAS No.: 885275-56-9;

[0098] n-Octyltriethoxysilane, CAS No.: 2943-75-1;

[0099] 5-Hexenyltriethoxysilane, CAS No.: 52034-14-7;

[0100] Butyl acrylate, CAS No.: 141-32-2;

[0101] Ethylene glycol dimethacrylate, CAS No.: 150-65-3;

[0102] Hydroxypropyl acrylate, CAS No.: 2918-23-2;

[0103] Styrene, CAS No.: 100-42-5;

[0104] Lauryl acrylate, CAS No.: 141-18-0;

[0105] Lauryl methacrylate, CAS No.: 142-90-5;

[0106] Perfluorooctylpropyl acrylate, CAS No.: 17451-31-2;

[0107] 4,4'-Dicyclohexylmethane diisocyanate, CAS No.: 10245-90-7;

[0108] Organosilicon defoamer (BYK-077): The main component is polysiloxane.

[0109] Surfactant (FC-134): The main component is perfluorooctyl quaternary ammonium iodide, CAS No.: 1652-63-7;

[0110] Silane coupling agent (KH-570): The main component is γ-methacryloyloxypropyltrimethoxysilane, CAS No.: 2530-85-0;

[0111] Ultraviolet absorber (UV-326): The main component is 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, CAS No.: 38649-28-3;

[0112] Light stabilizer 770: The main component is bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, CAS number: 36428-70-3;

[0113] Leveling agent (Tego450): The main component is polyether siloxane copolymer.

[0114] Example 1

[0115] In Example 1, the acrylate compounds include soft components, hard components, and functional components; wherein the soft components include butyl acrylate and butyl methacrylate, the hard components include styrene and lauryl acrylate, and the functional components include ethylene glycol dimethacrylate (EGDMA) and hydroxypropyl acrylate.

[0116] The fluorinated modified acrylic resin in Example 1 is perfluorooctylpropyl acrylate.

[0117] The raw materials for preparation are provided, by weight, as follows: 1 part nano-silica powder, 20 parts propylene glycol methyl ether, 50 parts ethanol, 5 parts isopropanol, 2.5 parts water, 5 parts (1H,1H,2H,2H-perfluorotetradecyl)tri(ethoxy)silane, 1.5 parts n-octyltriethoxysilane, 1 part 5-hexenyltriethoxysilane, and a mixture of sodium hydroxide, concentrated ammonia, and sodium ethoxide in a mass ratio of 1:1:1. Catalyst (appropriate amount), ammonium chloride solution (appropriate amount); 16 parts lauryl acrylate, 16 parts lauryl methacrylate, 2 parts ethylene glycol dimethacrylate, 4.5 parts hydroxypropyl acrylate, 3 parts styrene, 3 parts butyl acrylate; 10 parts perfluorooctylpropyl acrylate; 0.3 parts surfactant (FC-134); 0.1 parts silicone defoamer (BYK-077); 1 part silane coupling agent (KH-570); 55 parts ethyl acetate.

[0118] The raw materials for preparation are provided. By weight, the raw materials for preparing the curing agent component include: 5 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 35 parts of acetone, and 60 parts of ethyl acetate.

[0119] The raw materials for preparation are provided. By weight, the raw materials for preparing the auxiliary components include: 1 part of ultraviolet absorber (UV-326), 0.5 part of light stabilizer (light stabilizer 770), 0.1 part of leveling agent (Tego450), 50 parts of butyl acetate, 30 parts of butanol, and 20 parts of cyclohexanone.

[0120] Reference Figure 1 , Figure 2 and Figure 3 The preparation process of the coating in Example 1 includes the following steps:

[0121] S10. Grinded nano-silica (average particle size 30-80 nm) is mixed with propylene glycol methyl ether, ethanol, isopropanol and water, and stirred at 800 rpm for 1 h at 45 °C until the solution is uniformly mixed; an appropriate amount of alkaline catalyst is added to adjust the pH to 10, and stirred at 800 rpm for 2 h at 45 °C; then (1H,1H,2H,2H-perfluorotetradecyl)tri(ethoxy)silane, n-octyltriethoxysilane and 5-hexenyltriethoxysilane are added, and the mixture is stirred at 800 rpm for 3 h at 50 °C; an appropriate amount of ammonium chloride is added to adjust the pH to 6, and the mixture is allowed to stand for 0.5 h. Insoluble impurities are removed by filtering with a 200-mesh filter to obtain nanoparticle sol, which is dried at 60 °C to obtain fluorinated nano-silica;

[0122] S20. Slowly mix lauryl acrylate and lauryl methacrylate, then add to ethyl acetate and stir at low speed for 10 min. Add ethylene glycol dimethacrylate, hydroxypropyl acrylate, styrene, and butyl acrylate, and stir at medium speed for 20 min to ensure uniform dispersion. While stirring at medium speed, slowly add fluorinated modified acrylic resin and maintain stirring at medium speed for 15 min until completely dissolved. Add surfactant and silicone defoamer while stirring at low speed to ensure dispersion. Add 1 part of the fluorinated nano-silica prepared in step S10 and stir at low speed (300 rpm) for 10 min. Adjust the speed to medium speed (1200 rpm) and stir for 15 min to ensure uniform dispersion. Add silane coupling agent to ensure uniform dispersion. Stir at high speed (1800 rpm) for 5 min to further mix. After the solution stabilizes, filter (200 mesh) to remove any possible particles. Obtain the paint base component.

[0123] S21. Under low-speed stirring, acetone, ethyl acetate and 4,4'-dicyclohexylmethane diisocyanate are mixed evenly. After the solution stabilizes, it is filtered (200 mesh) to remove any possible particles; the curing agent component is obtained.

[0124] S22. The ultraviolet absorber (UV-326), light stabilizer (light stabilizer 770), leveling agent (Tego450), butyl acetate, butanol and cyclohexanone are mixed evenly under low speed to obtain the auxiliary component.

[0125] S30. Slowly add the curing agent component to the paint base component and mix evenly; then, adjust the parameters of the additive component according to the construction requirements such as viscosity and evaporation rate, and slowly add the additive component, mix evenly, and the coating is obtained.

[0126] Reference Figure 1 , Figure 1 Hydroxyl-terminated acrylic resins include acrylic resins obtained by copolymerizing lauryl acrylate, lauryl methacrylate, ethylene glycol dimethacrylate, hydroxypropyl acrylate, styrene, and butyl acrylate in step S20. Figure 1 The fluorinated silicon in it is fluorinated nano-silica.

[0127] Reference Figure 3 , Figure 3 Component A is the paint base component, component B is the curing agent component, and component C is the additive component.

[0128] Example 2

[0129] In Example 2, the acrylate compounds include soft components, hard components, and functional components; wherein the soft components include lauryl acrylate and lauryl methacrylate, the hard components include styrene and butyl acrylate, and the functional components include ethylene glycol dimethacrylate (EGDMA) and hydroxypropyl acrylate.

[0130] The fluorinated modified acrylic resin in Example 2 is perfluorooctylpropyl acrylate.

[0131] The raw materials provided, by weight, include: 2 parts nano-silica powder, 90 parts ethanol, 90 parts ethylene glycol, 20 parts isopropanol, 10 parts water, 4.5 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 3 parts dodecyltriethoxysilane, 1.5 parts dodecyltriethoxysilane, an appropriate amount of a mixed alkaline catalyst of sodium hydroxide, concentrated ammonia and sodium ethoxide in a mass ratio of 1:1:1, an appropriate amount of ammonium chloride; 12 parts lauryl acrylate, 12 parts lauryl methacrylate, 2 parts ethylene glycol dimethacrylate, 4.5 parts hydroxypropyl acrylate, 2 parts styrene, 2 parts butyl acrylate; 10 parts perfluorooctylpropyl acrylate; 0.2 parts surfactant (FC-134); 0.5 parts silicone defoamer (BYK-077); 0.1 parts silane coupling agent (KH-570); and 30 parts ethyl acetate.

[0132] The raw materials for preparation are provided. By weight, the raw materials for preparing the curing agent component include: 5 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 35 parts of acetone, and 60 parts of ethyl acetate.

[0133] The raw materials for preparation are provided. By weight, the raw materials for preparing the auxiliary components include: 2 parts of ultraviolet absorber (UV-326), 1 part of light stabilizer (light stabilizer 770), 0.5 parts of leveling agent (Tego450), 50 parts of butyl acetate, 30 parts of butanol, and 30 parts of cyclohexanone.

[0134] The preparation process of the coating in Example 2 includes the following steps:

[0135] S10. Grind the nano-silica (average particle size of 80 nm) with ethanol, ethylene glycol, isopropanol and water, and stir at 800 rpm at 45 °C for 1 h until the solution is uniformly mixed; add an appropriate amount of alkaline catalyst to adjust the pH to 9, and stir at 800 rpm at 45 °C for 2 h; then add 1H,1H,2H,2H-perfluorooctyltriethoxysilane, dodecyltriethoxysilane and docosyltriethoxysilane, and stir at 800 rpm at 50 °C for 3 h; add an appropriate amount of ammonium chloride to adjust the pH to 6, let stand for 0.5 h, filter with a 200 mesh filter to remove insoluble impurities, and obtain nanoparticle sol, which is dried at 60 °C to obtain fluorinated nano-silica;

[0136] S20. Lauryl acrylate and lauryl methacrylate are mixed and added to ethyl acetate. The mixture is stirred at low speed for 10 minutes. Ethylene glycol dimethacrylate, hydroxypropyl acrylate, styrene, and butyl acrylate are added, and the mixture is stirred at medium speed for 20 minutes to ensure uniform dispersion. Fluorine-modified acrylic resin is slowly added while stirring at medium speed for 15 minutes until completely dissolved. Surfactant and silicone defoamer are added while stirring at low speed to ensure dispersion. Two parts of the fluorinated nano-silica prepared in step S10 are added, and the mixture is stirred at low speed (300 rpm) for 10 minutes. The stirring speed is adjusted to medium speed (1200 rpm) and stirred for 15 minutes to ensure uniform dispersion. A silane coupling agent is added to ensure uniform dispersion. The mixture is stirred at high speed (1800 rpm) for 5 minutes to further mix. After the solution stabilizes, it is filtered (200 mesh) to remove any possible particles. The paint base component is obtained.

[0137] S21. Under low-speed stirring, acetone, ethyl acetate and 4,4'-dicyclohexylmethane diisocyanate are mixed evenly. After the solution stabilizes, it is filtered (200 mesh) to remove any possible particles; the curing agent component is obtained.

[0138] S22. The ultraviolet absorber (UV-326), light stabilizer (light stabilizer 770), leveling agent (Tego450), butyl acetate, butanol and cyclohexanone are mixed evenly under low speed to obtain the auxiliary component.

[0139] S30. Slowly add the curing agent component to the paint base component and mix evenly; then, adjust the parameters of the additive component according to the construction requirements such as viscosity and evaporation rate, and slowly add the additive component, mix evenly, and the coating is obtained.

[0140] Example 3

[0141] In Example 3, the acrylate compound comprises soft components, hard components, and functional components; wherein the soft components include lauryl acrylate and lauryl methacrylate, the hard components include styrene and butyl acrylate, and the functional components include ethylene glycol dimethacrylate (EGDMA) and hydroxypropyl acrylate.

[0142] The fluorinated modified acrylic resin in Example 3 is perfluorooctylpropyl acrylate.

[0143] The raw materials for preparation are provided as follows, by weight: 1 part nano-silica powder, 60 parts ethanol, 60 parts ethylene glycol, 20 parts isopropanol, 7 parts water, 3.5 parts 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 1 part octadecyltriethoxysilane, 2 parts 5-hexenyltriethoxysilane, an appropriate amount of a mixed alkaline catalyst of sodium hydroxide, concentrated ammonia and sodium ethoxide in a mass ratio of 1:1:1, an appropriate amount of ammonium chloride; 14 parts lauryl acrylate, 16 parts lauryl methacrylate, 2 parts ethylene glycol dimethacrylate, 4.5 parts hydroxypropyl acrylate, 2 parts styrene, 4 parts butyl acrylate; 10 parts perfluorooctylpropyl acrylate; 1 part surfactant (FC-134); 0.5 parts silicone defoamer (BYK-077); 2 parts silane coupling agent (KH-570); and 50 parts ethyl acetate.

[0144] The raw materials for preparation are provided. By weight, the raw materials for preparing the curing agent component include: 5 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 35 parts of acetone, and 60 parts of ethyl acetate.

[0145] The raw materials for preparation are provided. By weight, the raw materials for preparing the auxiliary components include: 2 parts of ultraviolet absorber (UV-326), 1 part of light stabilizer (light stabilizer 770), 0.5 parts of leveling agent (Tego450), 20 parts of butyl acetate, 20 parts of butanol, and 20 parts of cyclohexanone.

[0146] The preparation process of the coating in Example 3 includes the following steps:

[0147] S10. Grind the nano-silica (average particle size of 50 nm) with ethanol, ethylene glycol, isopropanol and water, and stir at 800 rpm for 1 h at 45 °C until the solution is uniformly mixed; add an appropriate amount of alkaline catalyst to adjust the pH to 12, and stir at 800 rpm for 2 h at 45 °C; then add 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, octadecyltriethoxysilane and 5-hexenyltriethoxysilane, and stir at 800 rpm for 6 h at 50 °C; add an appropriate amount of ammonium chloride to adjust the pH to 6.5, let stand for 1 h, and filter with a 200 mesh filter to remove insoluble impurities to obtain nanoparticle sol;

[0148] S20. Lauryl acrylate and lauryl methacrylate are mixed and added to ethyl acetate. The mixture is stirred at low speed for 10 minutes. Ethylene glycol dimethacrylate, hydroxypropyl acrylate, styrene, and butyl acrylate are added, and the mixture is stirred at medium speed for 20 minutes to ensure uniform dispersion. Fluorine-modified acrylic resin is slowly added while stirring at medium speed for 15 minutes until completely dissolved. Surfactant and silicone defoamer are added while stirring at low speed to ensure dispersion. One part of the fluorinated nano-silica prepared in step S10 is added, and the mixture is stirred at low speed (300 rpm) for 10 minutes. The stirring speed is adjusted to medium speed (1200 rpm) and stirred for 15 minutes to ensure uniform dispersion. A silane coupling agent is added to ensure uniform dispersion. The mixture is stirred at high speed (1800 rpm) for 5 minutes to further mix. After the solution stabilizes, it is filtered (200 mesh) to remove any possible particles. The paint base component is obtained.

[0149] S21. Under low-speed stirring, acetone, ethyl acetate and 4,4'-dicyclohexylmethane diisocyanate are mixed evenly. After the solution stabilizes, it is filtered (200 mesh) to remove any possible particles; the curing agent component is obtained.

[0150] S22. The ultraviolet absorber (UV-326), light stabilizer (light stabilizer 770), leveling agent (Tego450), butyl acetate, butanol and cyclohexanone are mixed evenly under low speed to obtain the auxiliary component.

[0151] S30. Slowly add the curing agent component to the paint base component and mix evenly; then, adjust the parameters of the additive component according to the construction requirements such as viscosity and evaporation rate, and slowly add the additive component, mix evenly, and the coating is obtained.

[0152] Performance testing

[0153] The coatings prepared in Examples 1 and 2 were sprayed onto the surface of an ABS plastic panel. The spraying pressure was controlled at 4-5 bar and the spraying distance was controlled at 50 cm. During the spraying process, the paint mist was ensured to be evenly distributed to avoid sagging and orange peel. The coating thickness was controlled to be about 100 micrometers. After spraying, the coating was dried at room temperature for about 2 hours until it was surface dry, and then thermally crosslinked and cured at about 65°C for 2 hours to obtain the corresponding coating.

[0154] (1) Hydrophobic and oleophobic performance test: The water contact angle and oil contact angle of the coating obtained in Example 1 were measured.

[0155] (2) The properties of the coatings prepared by the coatings in Example 1 and Example 2 were measured according to the measurement methods in Table 1 respectively; the specific measurement results are shown in Table 1.

[0156] Table 1

[0157]

[0158]

[0159] Performance test results: The coating formed in Example 1 has an oleophobic angle of 125° and a hydrophobic angle of 151° on the ABS substrate.

[0160] Analysis of the data in Table 1 shows that the coatings formed by the coatings prepared in Examples 1 and 2 have good performance in terms of easy cleaning, heat resistance, oil resistance, water resistance, impact resistance, corrosion resistance and weather resistance. In addition, the coatings have a smooth and beautiful appearance and good mechanical properties and adhesion, and can be well applied to the shell panels of various household appliances.

[0161] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A coating, characterized in that, The coating comprises a base component and a curing agent component; The paint base component comprises the following raw materials in parts by weight: Fluorinated nano-silica particles: 1-2 parts; Acrylic ester compounds: 30-40 parts; The raw materials for the fluorinated nano-silica particles include nano-silica particles and modifiers, wherein the modifiers include fluorosilanes and long-chain alkylsilanes.

2. The coating as described in claim 1, characterized in that, The fluorosilanes include at least one of perfluoroalkyltrimethoxysilane and perfluoroalkyltriethoxysilane.

3. The coating as described in claim 2, characterized in that, The perfluoroalkyltrimethoxysilane includes at least one of perfluorooctyltrimethoxysilane, perfluorodecyltrimethoxysilane, perfluorotetradecyltrimethoxysilane, and perfluoroheptadecyltrimethyloxysilane; And / or, the perfluoroalkyltriethoxysilane includes at least one of perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, perfluorotetradecyltriethoxysilane, and perfluoroheptadecanetriethyloxysilane.

4. The coating as described in claim 1, characterized in that, The long-chain alkylsilane includes at least one of long-chain alkyltrimethoxysilane and long-chain alkyltriethoxysilane.

5. The coating as described in claim 4, characterized in that, The long-chain alkyltrimethoxysilane includes at least one of n-octyltrimethoxysilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane, and docosyltrimethoxysilane; And / or, the long-chain alkyltriethoxysilane includes at least one of n-octyltriethoxysilane, dodecyltriethoxysilane, hexadecyltriethoxysilane, octadecyltriethoxysilane, and docosyltriethoxysilane.

6. The coating as described in claim 1, characterized in that, The modifier also includes alkenylsilane.

7. The coating as described in claim 6, characterized in that, The alkenylsilane includes at least one of vinyltrimethoxysilane, vinyltriethoxysilane, propenyltrimethoxysilane, propenyltriethoxysilane, 5-hexenyltrimethoxysilane, 5-hexenyltriethoxysilane, 7-octenyltrimethoxysilane, 7-octenyltriethoxysilane, 10-dodecenyltrimethoxysilane, 10-dodecenyltriethoxysilane, 18-octadecenyltrimethoxysilane, 18-octadecenyltriethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, and 3-methacryloyloxypropyltriethoxysilane.

8. The coating as described in claim 6, characterized in that, In the modifier, the weight ratio of the fluorosilane, long-chain alkylsilane and alkenylsilane is (3-5):(1-3):(1-2).

9. The coating as described in claim 1, characterized in that, In the fluorinated nano-silica particles, the weight ratio of the fluorosilane to the nano-silica particles is (3-5):

1.

10. The coating as described in claim 1, characterized in that, The acrylate compound comprises a soft component, a hard component, and a functional component, wherein the weight ratio of the soft component, the hard component, and the functional component is (25-40):(5-10):(1-5); The soft component is an acrylate containing a long alkyl chain, the hard component is an acrylate containing a short alkyl chain, and the functional component is an acrylate containing a functional group.

11. The coating as described in claim 1, characterized in that, The paint base component also includes 5 to 10 parts by weight of fluorine-modified acrylic resin.

12. The coating as described in claim 11, characterized in that, The fluorinated modified acrylic resin includes acrylates modified with fluoroalkyl chains.

13. The coating as described in claim 1, characterized in that, The paint base component also includes the following raw materials in parts by weight: Surfactant: 0.2 to 1 part; Silane coupling agent: 0.1–2 parts; Defoamer: 0.1–0.5 parts; Organic solvent: 30-55 parts by weight.

14. The coating as described in claim 1, characterized in that, The raw materials for the coating also include auxiliary components; The auxiliary agent component comprises the following raw materials in parts by weight: UV absorber: 1-2 parts; Light stabilizer: 0.5–1 part; Leveling agent: 0.1–0.5 parts; Solvent: 60-110 parts.

15. The coating as described in claim 14, characterized in that, In the coating, the weight ratio of the paint base component, the curing agent component and the additive component is (40-50):(5-10):(10-50).

16. A method for preparing a coating as described in any one of claims 1 to 15, characterized in that, The preparation method of the coating includes the following steps: S10. Disperse nano-silica particles in a solvent, adjust the pH to alkaline, add a modifier, react, adjust the pH to neutral or weakly acidic, let stand, filter to obtain a sol, dry, and obtain fluorinated nano-silica particles. S20. Add the organic solvent to the reaction vessel and stir. Add the acrylate compound and stir to dissolve. Add the fluorinated nano-silica particles obtained in step S10 and disperse them evenly. Let stand, filter and take the filtrate to obtain the paint base component. S30. The curing agent component and the paint base component obtained in step S20 are mixed according to the specified ratio to obtain the coating.

17. The method for preparing the coating as described in claim 16, characterized in that, Step S20 specifically includes: adding an organic solvent to a reaction vessel and stirring; adding a soft component and stirring at low speed for 5-10 minutes; adding a functional component and a hard component while stirring at low speed and stirring at medium speed for 10-20 minutes; adding a fluorinated modified acrylic resin while stirring at medium speed and stirring at medium speed for 10-15 minutes until completely dissolved; then adding the fluorinated nano-silica particles obtained in step S10 while stirring at low speed to ensure uniform dispersion; allowing to stand, filtering, and collecting the filtrate to obtain the paint base component.

18. The method for preparing the coating as described in claim 16, characterized in that, Between step S20 and step S30, the following is also included: S21. Add isocyanate curing agent and solvent to the reaction vessel, stir and disperse to obtain curing agent component; S22. Add ultraviolet absorber, light stabilizer, leveling agent and solvent to the reaction vessel, stir at low speed to medium-high speed, let stand, and obtain the auxiliary component.

19. The method for preparing the coating as described in claim 18, characterized in that, In step S30, the paint base component obtained in step S20, the curing agent component obtained in step S21, and the additive component obtained in step S22 are mixed in proportion to obtain the coating.

20. A household appliance, characterized in that, The household appliance uses the coating described in any one of claims 1 to 16.

21. The household appliance as described in claim 20, characterized in that, The household appliance includes an air conditioner, and the coating is formed on the panel surface of the air conditioner through a thermal cross-linking curing process to form a hydrophobic and oleophobic coating.

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