CN109401619B

CN109401619B - Coating composition and preparation method thereof, coated piece and preparation method thereof, and household appliance

Info

Publication number: CN109401619B
Application number: CN201811172186.3A
Authority: CN
Inventors: 赵莉
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2018-10-08
Filing date: 2018-10-08
Publication date: 2022-09-09
Anticipated expiration: 2038-10-08
Also published as: CN109401619A

Abstract

The invention provides a coating composition, a preparation method of the coating composition, a coating piece prepared from the coating composition, a preparation method of the coating piece, and a household appliance using the coating piece. The raw materials for preparing the coating composition comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt. The coating prepared by the coating composition has the advantages of high hardness, good adhesiveness, good temperature resistance and food contact safety level, and can also enable the household electrical appliance applying the coating to have the functions of bacteriostasis, deodorization and air purification.

Description

Coating composition and preparation method thereof, coated piece and preparation method thereof, and household appliance

Technical Field

The invention relates to the technical field of household appliances, in particular to a coating composition, a preparation method of the coating composition, a coating piece prepared from the coating composition, a preparation method of the coating piece and a household appliance using the coating piece.

Background

In the field of micro-baking, a coating is generally required to be formed on the surface of a kitchen electric household appliance, and the coating is mainly made of the following materials: enamel (the enamel can be formed on the surface of a product through an enamel process), organic silicon, teflon, epoxy powder (the epoxy powder can be sprayed on the surface of the product in a powder spraying manner), or silica sol + organic silicon hybrid coating. However, the coating has the disadvantages of low hardness, poor adhesion, poor temperature resistance, potential food contact safety hazards and the like. Moreover, the functions of the household appliances are single, and the multifunctional requirements of the users on the household appliances are difficult to meet.

Disclosure of Invention

The invention mainly aims to provide a coating composition, aiming at ensuring that a coating prepared from the coating composition not only has the advantages of high hardness, good adhesiveness and good temperature resistance and reaches the food contact safety level, but also ensures that a household appliance applying the coating has the functions of bacteriostasis, deodorization and air purification.

In order to solve the technical problems, the raw materials for preparing the coating composition provided by the invention comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one of qibingshi, tourmaline, opal and qicai stone, or the anion agent is a mixture of at least one of qibingshi, tourmaline, opal and qicai stone and rare earth oxide and/or rare earth composite salt.

Further, the polysilazane accounts for 6-81% of the preparation raw materials by mass, the polysiloxane accounts for 4-79% of the preparation raw materials by mass, and the negative ion agent accounts for 0.01-15% of the preparation raw materials by mass.

Further, the polysilazane has a structural formula:

wherein R is ₁ Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₂ Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₃ Is hydrogen, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino.

Further, said R ₁ And R ₂ At least one of which is a hydrogen radical or an alkene.

Further, the polysiloxane has the structural formula:

wherein R is ₄ Is hydrogen, alkane, cycloalkane, alkene, aryl, alkoxy, or alkylsiloxy, R ₅ Is hydrogen radical, alkane, cyclane, alkene, aryl, alkoxy or alkyl siloxy.

Further, the preparation raw material also comprises a solvent, wherein the solvent accounts for 10-66% of the mass of the preparation raw material, and is selected from at least one of alkane solvents, ether solvents, ketone solvents and benzene derivative solvents.

Further, the alkane solvent is selected from at least one or more of n-hexane, n-octane, n-decane, chloroform, dichloromethane, dichloroethylene and mineral oil; the ether solvent is at least one selected from diethyl ether, petroleum ether and dibutyl ether; the ketone solvent is selected from at least one of acetone, methyl ethyl ketone, cyclohexanone and isophorone; the benzene derivative solvent is at least one selected from toluene, m-xylene, p-xylene, o-xylene, and chlorobenzene.

Further, the preparation raw material also comprises a catalyst, the catalyst accounts for 0.01-5% of the mass of the preparation raw material, and the catalyst is an amine catalyst and/or a metal catalyst.

Further, the amine catalyst is selected from one or more of aliphatic amine, alicyclic amine, alcohol amine and aromatic amine, and the aliphatic amine is selected from at least one of diethylamine, triethylamine and triethylene tetramine; the alicyclic amine is at least one selected from triethylene diamine, piperazine, piperidine and morpholine; the alcohol amine is selected from at least one of N, N-dimethylethanolamine, diisopropanolamine and N, N-diethylethanolamine; the aromatic amine is selected from at least one of aniline, o-phenylenediamine, benzidine and N, N-dimethylaniline.

Further, the metal catalyst is an organic tin catalyst and/or a palladium catalyst, and the organic tin catalyst is at least one selected from dibutyltin dilaurate, stannous octoate, dimethyl tin and triphenyl tin; the palladium catalyst is at least one selected from carbon/palladium, palladium chloride, palladium propionate salt, palladium acetate salt and palladium triphenylphosphine.

Further, the preparation raw materials also comprise a filler, the filler accounts for 1-50% of the preparation raw materials by mass, and the filler is selected from at least one of silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black, attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres.

Further, the preparation raw materials also comprise a filler, a solvent and a catalyst, wherein the filler accounts for 1-50% of the preparation raw materials by mass, the solvent accounts for 10-66% of the preparation raw materials by mass, the catalyst accounts for 0.01-5% of the preparation raw materials by mass, and the polysiloxane and polysilazane account for 10-80% of the preparation raw materials by mass.

The invention also provides a preparation method of the coating composition, which comprises the following steps:

providing polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one selected from the group consisting of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one selected from the group consisting of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt;

mixing polysilazane and polysiloxane, and carrying out copolymerization reaction on the polysilazane and the polysiloxane to generate a polysilazane-polysiloxane copolymer;

and adding an anion agent into the polysilazane-polysiloxane copolymer to prepare the coating composition.

Further, after mixing polysilazane and polysiloxane, before adding an anion agent to the polysilazane-polysiloxane copolymer, the method for preparing the coating composition further comprises: and adding a catalyst into the polysilazane and the polysiloxane, wherein the catalyst accounts for 0.01-5% of the mass of the preparation raw material, and the catalyst is an amine catalyst and/or a metal catalyst.

Further, after the polysilazane-polysiloxane copolymer is formed and before the coating composition is prepared, the method for preparing the coating composition further comprises: and adding a filler into the polysilazane-polysiloxane copolymer, wherein the filler accounts for 1-50% of the mass of the preparation raw materials, and the filler is selected from at least one of silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black, attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres.

Further, after the polysilazane-polysiloxane copolymer is formed and before the coating composition is prepared, the method for preparing the coating composition further comprises: and adding a solvent into the polysilazane-polysiloxane copolymer, wherein the solvent accounts for 10-66% of the mass of the preparation raw material, and the solvent is selected from at least one of alkane solvents, ether solvents, ketone solvents and benzene derivative solvents.

The invention also provides a coated member which comprises a substrate and a coating layer formed on the surface of the substrate, wherein the coating layer contains the coating composition.

Further, the thickness of the coating ranges from 1 micron to 100 microns.

The invention also provides a preparation method of the coating member, which comprises the following steps:

providing a substrate and the coating composition;

and coating the coating composition on the surface of a substrate to form a coating layer, thus obtaining the coated piece.

The invention also provides a household appliance comprising the coating element.

The raw materials for preparing the coating composition comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one selected from mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one selected from mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt. The polysilazane and the polysiloxane can generate copolymerization reaction to generate a polysilazane-polysiloxane copolymer, and the polysilazane-polysiloxane copolymer has the advantages of high hardness, good adhesion and good temperature resistance, so that a coating formed by the coating composition has the advantages of high hardness, good adhesion and good temperature resistance. The anion agent is dispersed in the polysilazane-polysiloxane copolymer, and the anion agent can enable a coating formed by the coating composition to have a function of releasing anions. When the coating is applied to household appliances, the household appliances can have the functions of bacteriostasis, deodorization and air purification. Moreover, the polysilazane, the polysiloxane, the polysilazane-polysiloxane copolymer and the anion agent are not toxic and harmful substances, so that the coating prepared from the coating composition also has the advantage of food contact safety.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a coating composition.

The raw materials for preparing the coating composition comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt.

The qibingshi, tourmaline, opal and qicai stone can be collectively referred to as component A.

The rare earth oxide or rare earth complex salt may be collectively referred to as a rare earth element-containing substance.

The component A accounts for 8-9.5% of the mass percentage of the preparation raw materials, and preferably 8-9%.

The mass percentage of the rare earth element-containing substance in the preparation raw material is 0.5-2%, preferably 1-2%.

In one embodiment of the present invention, the anion agent comprises component a and a rare earth oxide.

In another embodiment of the invention, the anion agent comprises a component A and rare earth composite salts.

In another embodiment of the present invention, the anion agent comprises component A, rare earth oxide, and rare earth complex salt.

The rare earth elements are lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), yttrium (Y) and scandium (Sc).

The rare earth oxide can be the oxide of the above rare earth elements, such as cerium dioxide, cerium oxide, lanthanum oxide, neodymium oxide, etc.

The rare earth composite salt can be a salt of the above rare earth elements, such as lanthanum phosphate, cerium phosphate, neodymium phosphate, cerium nitrate, lanthanum nitrate, neodymium nitrate and the like.

The anionic agent may be in the form of particles, and the particle size of the anionic agent may be less than 3 microns, preferably less than 2 microns, more preferably less than 1 micron.

In an embodiment of the invention, the particle size of the anion agent is in a range of 0.2 to 0.8 μm. It is understood that the particle size of the anionic agent is 0.2 microns, 0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, or 0.8 microns.

It can be understood that when the particle size range of the anion agent is set to be 0.2-0.8 micrometers, the anion agent can be more uniformly dispersed in the preparation raw material, and the surface of the prepared coating is smoother.

In another embodiment of the invention, the particle size of the anion agent is in a range of 0.2-0.5 micron to obtain a smoother coating.

In one embodiment of the present invention, the negative ion agent can be ground by a grinder to reduce the particle size of the negative ion agent, and the ground negative ion agent is added to the polysilazane-polysiloxane copolymer.

In another embodiment of the present invention, after the anionic agent is added to the polysilazane-polysiloxane copolymer, a primary product of the coating is obtained, and the primary product may be subjected to a grinding treatment to reduce the particle size of the anionic agent in the primary product and to prevent agglomeration.

The raw materials for preparing the coating composition comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt. The polysilazane and the polysiloxane can generate copolymerization reaction to generate a polysilazane-polysiloxane copolymer, and the polysilazane-polysiloxane copolymer has the advantages of high hardness, good adhesion and good temperature resistance, so that a coating formed by the coating composition has the advantages of high hardness, good adhesion and good temperature resistance. The anion agent is dispersed in the polysilazane-polysiloxane copolymer, and the anion agent can enable a coating formed by the coating composition to have a function of releasing anions. When the coating is applied to the household appliance, the household appliance has the functions of bacteriostasis, deodorization and air purification. Moreover, the polysilazane, the polysiloxane, the polysilazane-polysiloxane copolymer and the anion agent are not toxic and harmful substances, so that the coating prepared from the coating composition also has the advantage of food contact safety.

The polysilazane accounts for 6-81% of the mass of the preparation raw material, the polysiloxane accounts for 4-79% of the mass of the preparation raw material, and the negative ion agent accounts for 0.01-15% of the mass of the preparation raw material.

In an embodiment of the invention, the polysilazane accounts for 6-81% of the raw material. Preferably, the polysilazane accounts for 10-70% of the mass of the preparation raw material, more preferably 15-60%, and even more preferably 20-50%.

In an embodiment of the invention, the polysiloxane accounts for 4-79% of the preparation raw materials by mass. Preferably, the polysiloxane accounts for 10-60% of the mass of the preparation raw materials, more preferably 15-50%, and even more preferably 20-40%.

In an embodiment of the invention, the mass percentage of the negative ion agent in the preparation raw material is 0.01-15%. Preferably, the mass percentage of the negative ion agent in the preparation raw material is 1-15%, and more preferably 5-10%.

According to the technical scheme, the polysilazane accounts for 6-81% of the mass of the preparation raw materials, the polysiloxane accounts for 4-79% of the mass of the preparation raw materials, at the moment, the polysilazane can be subjected to copolymerization with the polysiloxane to generate a certain content of polysilazane-polysiloxane copolymer, the negative ion agent accounts for 0.01-15% of the mass of the preparation raw materials, and the negative ion agent is uniformly dispersed in the polysilazane-polysiloxane copolymer, so that the polysilazane-polysiloxane copolymer and the negative ion agent with the content can enable a coating prepared from the polysilazane-polysiloxane copolymer to have the advantages of high hardness, good adhesiveness, good temperature resistance and food contact safety, and further enable a household appliance applying the coating to have the functions of inhibiting bacteria, deodorizing and purifying air.

The structural formula of the polysilazane is as follows:

wherein R is ₁ Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxane radical or alkyl amine radical,R ₂ is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₃ Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxane radical or alkyl amine radical.

The polysiloxane has the structural formula:

wherein R is ₄ Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, or alkyl siloxy, R ₅ Is hydrogen radical, alkane, cyclane, alkene, aryl, alkoxy or alkyl siloxy.

In one embodiment of the present invention, R ₁ And R ₂ At least one of the two is a hydrogen radical or an alkene.

It is understood that the polysilazane and the polysiloxane in the preparation raw materials are both high-temperature resistant materials.

Understandably, R ₁ 、R ₂ And R ₃ Can be the same group or different groups, and can be adjusted according to actual requirements.

Understandably, R ₄ And R ₅ Can be the same group or different groups, and can be adjusted according to actual requirements.

R1 and R ₂ And R ₃ Other groups capable of achieving the same or similar functions can be used, and the invention is not limited to the groups; r is ₄ And R ₅ Other groups that perform the same or similar functions may be used, and the present invention is not limited thereto.

In the technical scheme of the invention, the polysilazane can be subjected to copolymerization reaction with the polysiloxane to generate the main resin of the coating composition, so that a coating prepared from the coating composition has the advantages of high hardness, good adhesiveness, good temperature resistance and food contact safety level.

The molecular weight of the polysilazane is 100-1000.

The molecular weight of the polysiloxane is 100-1300.

In one embodiment of the present invention, the polysilazane has a molecular weight of 100, 200, 300, 400, 500, 600, 700, 800, 900 or 1000.

In an embodiment of the present invention, the molecular weight of the polysilazane is preferably 100 to 700, and more preferably 100 to 300.

In one embodiment of the invention, the polysiloxane has a molecular weight of 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, or 1300.

In one embodiment of the present invention, the molecular weight of the polysiloxane is preferably 200 to 900, and more preferably 200 to 500.

According to the technical scheme, the molecular weight of polysilazane in the preparation raw materials is 100-1000, the molecular weight of polysiloxane is 100-1300, the polysilazane with the molecular weight of 100-1000 and the polysiloxane with the molecular weight of 100-1300 are subjected to copolymerization reaction to generate a polysilazane-polysiloxane copolymer, and after a coating composition containing the polysilazane-polysiloxane copolymer is formed on a substrate to form a coating, the coating has the advantages of good hardness, adhesiveness, temperature resistance and food contact safety level.

The preparation raw materials further comprise a solvent, and the solvent accounts for 10-66% of the mass percentage of the preparation raw materials, preferably 15-50%, more preferably 20-40%, and further preferably 30-35%.

The solvent is at least one selected from alkane solvents, ether solvents, ketone solvents and benzene derivative solvents.

The alkane solvent can be at least one selected from n-hexane, n-octane, n-decane, chloroform, dichloromethane, dichloroethylene and mineral oil.

The ether solvent can be at least one selected from diethyl ether, petroleum ether and dibutyl ether.

The ketone solvent may be at least one selected from acetone, methyl ethyl ketone, cyclohexanone, and isophorone.

The benzene derivative solvent is at least one selected from toluene, m-xylene, p-xylene, o-xylene, and chlorobenzene.

It should be noted that other solvents that can dissolve the copolymer of polysiloxane and polysilazane can also be used as the solvent of the present invention, and the present invention is not limited thereto.

The polysilazane-polysiloxane copolymer is soluble in a solvent so that the polysilazane-polysiloxane copolymer can be more easily formed on the surface of a substrate.

The preparation raw material also comprises a catalyst, and the catalyst accounts for 0.01-5% of the preparation raw material by mass, preferably 0.1-5%, more preferably 1-5%, and further preferably 2-3%.

The catalyst is an amine catalyst and/or a metal catalyst.

The amine catalyst may be one or more selected from aliphatic amine, alicyclic amine, alcohol amine, and aromatic amine.

The fatty amine can be at least one selected from diethylamine, triethylamine and triethylene tetramine.

The alicyclic amine can be selected from at least one of triethylene diamine, piperazine, piperidine and morpholine.

The alcohol amine may be at least one selected from the group consisting of N, N-dimethylethanolamine, diisopropanolamine, and N, N-diethylethanolamine.

The aromatic amine is at least one selected from aniline, o-phenylenediamine, benzidine and N, N-dimethylaniline.

The metal-based catalyst may be an organotin catalyst and/or a palladium-based catalyst.

The organic tin catalyst can be at least one selected from dibutyltin dilaurate, stannous octoate, dimethyl tin and triphenyl tin.

The palladium catalyst may be at least one selected from carbon/palladium, palladium chloride, palladium propionate salt, palladium acetate salt, and palladium triphenylphosphine.

It should be noted that the catalyst of the present invention can also be other catalysts with similar performance, and the present invention is not limited thereto.

In the technical scheme of the invention, the catalyst can accelerate the copolymerization reaction of polysilazane and polysiloxane, so that the polysilazane-polysiloxane copolymer is generated in a short time.

The preparation raw materials also comprise a filler, and the filler accounts for 1-50% of the preparation raw materials by mass, preferably 5-40%, preferably 10-30%, and more preferably 15-25%.

The filler is at least one selected from silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black (silicon dioxide aerogel), attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres.

The filler may have a particle size of less than 3 microns, preferably less than 2 microns, more preferably less than 1 micron.

In an embodiment of the present invention, the particle size of the filler ranges from 0.2 to 0.8 μm. It is understood that the particle size of the filler is 0.2 microns, 0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, or 0.8 microns.

It can be understood that when the particle size range of the filler is set to be 0.2-0.8 micrometers, the filler can be uniformly dispersed in the preparation raw material, and the surface of the prepared coating is relatively flat.

In another embodiment of the present invention, the particle size of the filler is in the range of 0.2 to 0.5 μm to obtain a smoother coating.

In one embodiment of the present invention, the filler may be ground by a grinder to reduce the particle size of the filler, and the ground filler may be added to the polysilazane-polysiloxane copolymer.

In another embodiment of the invention, after the filler is added to the polysilazane-polysiloxane copolymer, a primary product of the coating is obtained, which may be subjected to a grinding treatment to reduce the particle size of the filler in the primary product.

In one embodiment of the invention, the filler is uniformly dispersed in the coating.

In the technical scheme of the invention, the filler is selected from at least one of silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black (silicon dioxide aerogel), attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres so as to improve the hardness, adhesiveness and temperature resistance of the coating.

It should be noted that other fillers with high temperature resistance can also be used as the filler of the present invention, and the present invention is not limited thereto.

The preparation raw materials also comprise a wave absorbing agent.

The wave absorbing agent accounts for 0.01-20% of the mass percentage of the preparation raw materials. Preferably, the wave absorbing agent accounts for 1-20% of the mass of the preparation raw materials, more preferably 5-15%, and even more preferably 5-10%.

The wave absorbing agent is at least one selected from silicon carbide, silicon nitride, graphene, zinc oxide, titanium carbide, carbon nano tube, boron nitride and titanium nitride.

The wave absorber may be in particulate form and may have a particle size of less than 3 microns, preferably less than 2 microns, more preferably less than 1 micron.

In an embodiment of the invention, the particle size of the wave absorber is in a range of 0.2 to 0.8 μm. It is understood that the particle size of the wave absorber is 0.2 microns, 0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, or 0.8 microns.

It can be understood that when the particle size range of the wave absorbing agent is set to be 0.2-0.8 micrometers, the wave absorbing agent can be uniformly dispersed in the preparation raw material, and the surface of the prepared coating is relatively flat.

In another embodiment of the invention, the particle size of the wave absorber is in a range of 0.2-0.5 microns to obtain a smoother coating.

In an embodiment of the present invention, a grinder may be used to grind the wave-absorbing agent to reduce the particle size of the wave-absorbing agent, and the ground wave-absorbing agent is added to the polysilazane-polysiloxane copolymer.

In another embodiment of the present invention, after the wave-absorbing agent is added to the polysilazane-polysiloxane copolymer, a primary product of the coating is obtained, and the primary product may be subjected to a grinding treatment to reduce the particle size of the wave-absorbing agent in the primary product.

In an embodiment of the present invention, the wave absorber is uniformly dispersed in the coating.

The preparation raw materials of the technical scheme of the invention comprise the wave absorbing agent which can be uniformly dispersed in the coating composition, and the wave absorbing agent has excellent wave absorbing performance, so that a coating prepared from the coating composition can have high wave absorbing efficiency under a thinner thickness.

It should be noted that other wave absorbing agents having wave absorbing performance may be used as the wave absorbing agent of the present invention, and the present invention is not limited thereto.

The preparation raw materials also comprise a far infrared agent.

The far infrared agent is selected from at least one of boron nitride, titanium nitride, zirconium nitride, manganese dioxide and zirconium dioxide, or the far infrared agent is a mixture of at least one of boron nitride, titanium nitride, zirconium nitride, manganese dioxide and zirconium dioxide and tourmaline.

The far infrared agent accounts for 0.01-15% of the mass percentage of the preparation raw materials. Preferably, the far infrared agent accounts for 1-15% of the preparation raw materials by mass, more preferably 5-15% of the preparation raw materials by mass, and even more preferably 5-10% of the preparation raw materials by mass.

The far infrared agent may be in the form of particles, and the particle size of the far infrared agent may be less than 3 microns, preferably less than 2 microns, and more preferably less than 1 micron.

In an embodiment of the present invention, the particle size of the far infrared agent is in a range of 0.2 to 0.8 μm. It is understood that the particle size of the far infrared agent is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8 micron.

It can be understood that when the particle size range of the far infrared agent is set to be 0.2-0.8 micrometers, the far infrared agent can be uniformly dispersed in the preparation raw materials, and the surface of the prepared coating is smooth.

In another embodiment of the present invention, the particle size of the far infrared agent ranges from 0.2 to 0.5 μm to obtain a smoother coating.

In one embodiment of the present invention, the far infrared agent may be ground by a grinder to reduce the particle size of the far infrared agent, and then the ground far infrared agent is added to the polysilazane-polysiloxane copolymer.

In another embodiment of the present invention, after the far infrared agent is added to the polysilazane-polysiloxane copolymer, a coated primary product is obtained, and the primary product may be subjected to a grinding process to reduce the particle size of the far infrared agent in the primary product and reduce agglomeration.

The preparation raw materials of the technical scheme of the invention comprise the far infrared agent which can be uniformly dispersed in the coating composition, and the far infrared agent can ensure that a coating formed by the coating composition also has far infrared performance. When the coating is applied to the household appliance, the heating efficiency and the heat preservation effect of the household appliance can be improved.

It should be noted that other far infrared agents with far infrared performance can also be used as the far infrared agent of the present invention, and the present invention is not limited thereto.

In an embodiment of the present invention, the raw materials for preparing the coating composition further include a colorant, and the colorant accounts for 0.01 to 5% by mass of the raw materials, preferably 0.1 to 5% by mass, more preferably 1 to 5% by mass, and even more preferably 2 to 3% by mass.

The colorant is selected from at least one of a white colorant, a yellow colorant, an orange colorant, a black colorant, a violet colorant, a brown colorant, a green colorant, a blue colorant, a gray colorant, and a red colorant, such that a coating layer prepared by the coating composition has a multi-colored appearance.

The white coloring material is at least one selected from Antimony white (Antimony white), Barium sulfate (Barium sulfate), Lithopone (Lithopone), Titanium white (Titanium white), and Zinc white (Zinc white).

The yellow pigment is Nickel antimony titanate (Nickel titanate antioxidant) and/or titanium chromium brown (Chrome titanium brown).

The orange pigment is Zinc-Tin Rutile (Rutile Tin Zinc).

The black pigment is selected from copper-chromium blackSpinel (Copper chromium black spinel), Titanium black (Titanium black), manganese dioxide (MnO) ₂ ) At least one of Mars black, Ivory black, and Carbon black.

The purple colorant is Cobalt Phosphate (Cobalt Phosphate).

The brown pigment is titanium Manganese brown (mangase immunity brown) and/or zinc iron Chromium brown (Chromium iron zinc brown).

The Green colorant is at least one of Cobalt Green (Cobalt Green), Malachite (Malachite), and glauconite (Green earth).

The blue pigment is selected from at least one of celestite (Ultramarine), Cobalt blue (Cobalt blue), Egyptian blue (Egyptian blue), Han blue (Han blue), copper blue ore (Azurite) and yttrium indium manganese blue (YINM blue).

The grey pigment is Copper chromium black spinel (Copper chromium black spinel), Titanium black (Titanium black) and manganese dioxide (MnO) ₂ ) A mixture of at least one of macs black (Mars black), black violet (Vine black), Ivory black (Ivory black), and Carbon black (Carbon black), and at least one of Antimony white (Antimony white), Barium Sulfate (Barium Sulfate), Lithopone (Lithopone), Titanium white (Titanium white), and Zinc white (Zinc white), to which at least one of Burnt ochre (Burnt sienna), indian Red (India Red), and Cobalt blue (Cobalt blue) may be further added.

The Red pigment is at least one selected from calcined loess (Burnt Sienna), Burnt Haematitum (Red ochre), and Indian Red (India Red).

It will be appreciated that the choice of colorants can be made to give the coating a better appearance according to the actual requirements.

In an embodiment of the present invention, the coating is prepared from the following raw materials: polysiloxane, polysilazane, an anion agent, a filler, a solvent, and a catalyst. The polysiloxane and polysilazane account for 10-80% of the preparation raw materials by mass, the negative ion agent accounts for 0.01-15% of the preparation raw materials by mass, the filler accounts for 1-50% of the preparation raw materials by mass, the solvent accounts for 10-66% of the preparation raw materials by mass, and the catalyst accounts for 0.01-5% of the preparation raw materials by mass.

In an embodiment of the present invention, the coating is prepared from the following raw materials: polysiloxane, polysilazane, an anion agent, a filler, a solvent, a far infrared agent, a wave absorbing agent and a catalyst. The mass percentage range of the polysiloxane and the polysilazane in the preparation raw materials is 10-80%, the mass percentage range of the negative ion agent in the preparation raw materials is 0.01-15%, the mass percentage range of the filler in the preparation raw materials is 1-50%, the mass percentage range of the solvent in the preparation raw materials is 10-66%, the mass percentage range of the far infrared agent in the preparation raw materials is 0.01-15%, the mass percentage range of the wave absorbing agent in the preparation raw materials is 0.01-20%, and the mass percentage range of the catalyst in the preparation raw materials is 0.01-5%.

In an embodiment of the present invention, the coating is prepared from the following raw materials: polysiloxane, polysilazane, an anion agent, a filler, a solvent, a pigment and a catalyst. The polysiloxane and the polysilazane account for 10-80% of the preparation raw materials by mass, the negative ion agent accounts for 0.01-15% of the preparation raw materials by mass, the filler accounts for 1-50% of the preparation raw materials by mass, the solvent accounts for 10-66% of the preparation raw materials by mass, the pigment accounts for 0.01-5% of the preparation raw materials by mass, and the catalyst accounts for 0.01-5% of the preparation raw materials by mass.

In an embodiment of the present invention, the coating is prepared from the following raw materials: polysiloxane, polysilazane, an anion agent, a filler, a solvent, a far infrared agent, a wave absorbing agent, a pigment and a catalyst. The mass percentage range of the polysiloxane and the polysilazane in the preparation raw materials is 10-80%, the mass percentage range of the negative ion agent in the preparation raw materials is 0.01-15%, the mass percentage range of the filler in the preparation raw materials is 1-50%, the mass percentage range of the solvent in the preparation raw materials is 10-66%, the mass percentage range of the far infrared agent in the preparation raw materials is 0.01-15%, the mass percentage range of the wave absorbing agent in the preparation raw materials is 0.01-10%, the mass percentage range of the pigment in the preparation raw materials is 0.01-5%, and the mass percentage range of the catalyst in the preparation raw materials is 0.01-5%.

It can be understood that the polysilazane, the polysiloxane, the polysilazane-polysiloxane copolymer, the anion agent, the solvent, the pigment, the far infrared agent, the wave absorbing agent, the catalyst and the filler of the invention are all not toxic and harmful substances, so that the coating prepared from the preparation raw material has the advantage of food contact safety.

In one embodiment of the present invention, the polysiloxane and the polysilazane may be placed in a reactor, and the polysiloxane and the polysilazane may be subjected to a first stirring treatment to uniformly mix the polysiloxane and the polysilazane, and the polysiloxane and the polysilazane may undergo a copolymerization reaction to generate the polysiloxane-polysilazane copolymer.

In one embodiment of the present invention, the stirring rate of the first stirring treatment is 100 to 800 rpm, preferably 200 to 600 rpm, and more preferably 400 to 500 rpm.

It is understood that the time of the copolymerization reaction may be 10 seconds to 50 minutes, and the time of the copolymerization reaction may be adjusted according to the actual production needs.

It will be appreciated that the time of the first agitation treatment corresponds to the time of the copolymerization reaction.

In another embodiment of the present invention, after the anionic agent is added to the polysilazane-polysiloxane copolymer, a primary product of the coating is obtained, and the primary product may be subjected to a grinding treatment to reduce the particle size of the anionic agent in the primary product.

The raw materials for preparing the coating composition comprise polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt. The polysilazane and the polysiloxane can generate copolymerization reaction to generate a polysilazane-polysiloxane copolymer, and the polysilazane-polysiloxane copolymer has the advantages of high hardness, good adhesion and good temperature resistance, so that a coating formed by the coating composition has the advantages of high hardness, good adhesion and good temperature resistance. The negative ion agent is dispersed in the polysilazane-polysiloxane copolymer, and the negative ion agent can enable a coating formed by the coating composition to have a function of releasing negative ions. When the coating is applied to the household appliance, the household appliance has the functions of bacteriostasis, deodorization and air purification. Moreover, the polysilazane, the polysiloxane, the polysilazane-polysiloxane copolymer and the anion agent are not toxic and harmful substances, so that the coating prepared from the coating composition also has the advantage of food contact safety.

After mixing the polysilazane and the polysiloxane, and before adding the negative ion agent to the polysilazane-polysiloxane copolymer, the method for preparing the coating composition further comprises: and adding a catalyst into the polysilazane and the polysiloxane, wherein the mass percentage of the catalyst in the preparation raw material is 0.01-5%, preferably 0.1-5%, more preferably 1-5%, and further preferably 2-3%.

The catalyst is an amine catalyst and/or a metal catalyst.

It will be appreciated that after the catalyst is added to the polysilazane and polysiloxane, a second agitation treatment is applied to the mixture to uniformly mix the polysilazane, polysiloxane and catalyst.

In an embodiment of the present invention, the stirring rate of the second stirring process may be 1000 to 2000 rpm, preferably 1200 to 1800 rpm, and more preferably 1500 to 1600 rpm.

In an embodiment of the present invention, the time of the second stirring treatment may be 10 seconds to 50 minutes, preferably 5 to 15 minutes, and more preferably 8 to 12 minutes.

It should be noted that the stirring speed of the second stirring treatment and the time of the second stirring treatment may also be other values, which is not limited in the present invention.

In the technical scheme of the invention, a catalyst can be added into polysilazane and polysiloxane to promote the copolymerization reaction of polysiloxane and polysilazane to generate the main body resin required by the invention, namely polysiloxane-polysilazane copolymer.

After forming the polysilazane-polysiloxane copolymer, and before preparing the coating composition, the method for preparing the coating composition further comprises: adding a solvent, a filler, a far infrared agent and a wave absorbing agent into the polysilazane-polysiloxane copolymer.

The solvent accounts for 10-66% of the mass of the preparation raw materials, preferably 15-50%, more preferably 20-40%, and even more preferably 30-35%.

The filler accounts for 1-50% of the preparation raw materials by mass, preferably 5-40%, preferably 10-30%, and more preferably 15-25%.

The filler is at least one selected from silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black, attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres.

The wave absorbing agent is selected from at least one of silicon carbide, silicon nitride, graphene, zinc oxide, titanium carbide, carbon nano tube, boron nitride and titanium nitride.

The far infrared agent accounts for 0.01-15% of the mass of the preparation raw materials. Preferably, the far infrared agent accounts for 1-20% of the preparation raw materials by mass, more preferably 5-15% of the preparation raw materials by mass, and even more preferably 5-10% of the preparation raw materials by mass.

In an embodiment of the present invention, after the solvent, the filler, the anion agent, the far infrared agent and the wave absorbing agent are added to the polysilazane-polysiloxane copolymer, the mixture may be stirred for the third time, so that the polysilazane-polysiloxane copolymer, the solvent, the filler, the anion agent and the wave absorbing agent are uniformly mixed.

It is understood that the solvent is added into the polysilazane-polysiloxane copolymer, and then the filler, the anion agent, the far infrared agent and the wave absorbing agent are added, and the stirring treatment is performed for the third time. Or simultaneously adding a solvent, a filler, an anion agent, a far infrared agent and a wave absorbing agent into the polysilazane-polysiloxane copolymer, and carrying out third stirring treatment on the mixture.

The stirring speed of the third stirring treatment can be 100-3000 r/min, preferably 500-2000 r/min, and more preferably 1000-1500 r/min.

In an embodiment of the invention, the time of the third stirring treatment may be 2 to 20 minutes, preferably 5 to 15 minutes, and more preferably 8 to 12 minutes.

It should be noted that the stirring rate of the third stirring treatment and the time of the third stirring treatment may also be other values, which is not limited in the present invention.

The particle size of the filler, the far infrared agent and the wave absorbing agent can be less than 3 microns, preferably less than 2 microns, and more preferably less than 1 micron.

In an embodiment of the present invention, the particle size of the filler, the far infrared agent and the wave absorbing agent is in a range of 0.2 to 0.8 μm. It is understood that the particle size of the filler, the far infrared agent, and the wave absorbing agent is 0.2 micrometers, 0.3 micrometers, 0.4 micrometers, 0.5 micrometers, 0.6 micrometers, 0.7 micrometers, or 0.8 micrometers.

It can be understood that when the particle size range of the filler, the far infrared agent and the wave absorbing agent is set to be 0.2-0.8 micrometers, the filler, the far infrared agent and the wave absorbing agent can be uniformly dispersed in the coating composition, and the surface of the prepared coating is relatively flat.

In one embodiment of the present invention, the filler, the far infrared agent and the wave absorbing agent may be ground by a grinder to reduce the particle size of the filler, the far infrared agent and the wave absorbing agent, and then the ground filler, the far infrared agent and the wave absorbing agent are added to the polysilazane-polysiloxane copolymer.

In another embodiment of the present invention, the filler, the far infrared agent and the wave absorbing agent with larger particle size can be directly added into the polysilazane-polysiloxane copolymer, and then the coating composition is ground to reduce the particle size of the filler, the far infrared agent and the wave absorbing agent in the coating composition.

The time of the grinding treatment can be 0.5 to 1 hour. The grinding time can be adjusted according to actual requirements to obtain the filler, the far infrared agent and the wave absorbing agent with corresponding particle sizes.

In the technical scheme of the invention, the polysilazane-polysiloxane copolymer can be dissolved in a solvent, so that the coating composition can be easily coated on the surface of a substrate. The filler, the far infrared agent and the wave absorbing agent can also be dispersed in the solvent and the polysilazane-polysiloxane copolymer to increase the hardness, the adhesiveness and the temperature resistance of the coating composition, and the household appliance applying the coating has the advantages of high wave absorbing efficiency, high heating efficiency and good heat preservation effect.

It will be appreciated that when a filler is added to the polysilazane-polysiloxane copolymer, a pigment may also be added to give the coating a better appearance.

It should be noted that, in the preparation method of the coating composition, the addition sequence and the grinding mode of each component can be adjusted according to actual requirements, and the stirring speed, the stirring time and the like are only typical values in the preparation process and can be adjusted according to actual requirements.

It will be appreciated that the coating composition may be applied to the surface of a substrate to form the coating.

It can be understood that the coating layer prepared from the coating composition has a thermal weight loss of less than 5% in an oxygen environment at 500 ℃, indicating that the coating layer has very excellent heat resistance.

Please refer to the above embodiments for components, proportions, etc. of the coating composition, since the coating member adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The thickness of the coating ranges from 1 micron to 100 microns, preferably ranges from 1 micron to 80 microns, more preferably ranges from 5 microns to 70 microns, and further preferably ranges from 10 microns to 50 microns.

The coating can have a thickness of 1 micron, 2 microns, 5 microns, 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns, or 100 microns.

It will be appreciated that the thickness of the coating may be adjusted according to the actual requirements.

In the technical scheme of the invention, when the thickness of the coating is in the range of 1-100 micrometers, the household appliance with the coating not only has better functions of bacteriostasis, deodorization and air purification, but also has the advantages of high heating efficiency and good heat preservation.

providing a substrate and the coating composition;

It will be appreciated that the coating composition may be first ground to reduce agglomeration and then the ground coating composition may be applied to the surface of the substrate.

It will be appreciated that when the coating composition is applied to the surface of a substrate, the substrate is subjected to a heat treatment at a temperature of less than 300 c, preferably from 200 c to 280 c, to cure the coating composition on the surface of the substrate to form a coating. The thickness of the coating can range from 1 to 100 microns.

In an embodiment of the present invention, the substrate may be pretreated by degreasing, cleaning, and drying, so as to clean the substrate surface and improve the adhesion of the coating on the substrate surface.

According to the technical scheme, the coating composition can be directly coated on the surface of the substrate, and the coated piece can be prepared after the coating composition is cured, so that the preparation method of the coated piece has the advantage of simple forming process. And the temperature of the curing treatment is lower than 300 ℃, compared with the technical scheme of high-temperature curing in the prior art, the preparation method of the coating piece has the advantage of low energy consumption.

It can be understood that the coating has better adhesiveness, and does not need to perform pretreatment such as sanding on the substrate, so that the process difficulty of the preparation method of the coating piece is reduced, and compared with the technical scheme in the prior art that sanding treatment needs to be performed on the substrate, the preparation method of the coating piece provided by the invention also has the advantage of environmental protection.

The household appliance can be a microwave oven, an induction cooker, an oven, a bread maker, a noodle maker, a smoke exhaust ventilator, an air explosion fryer, a cake grade, a humidifier, an electric kettle, an electric hair drier, a juice extractor, a pressure cooker, an electric rice cooker, a water heater, a computer, an electric fan, an electric frying pan, a soybean milk maker, an air conditioner, a sound box, a cooking range, a refrigerator or the like.

In an embodiment of the present invention, the coating member may be a housing of a home appliance. In particular, the coating member may be an outer or inner shell of a household appliance.

In a specific embodiment of the present invention, when the household appliance is a heating appliance such as a microwave oven, an air fryer or a toaster, the coating member may be an inner cavity of the microwave oven or the toaster or a heating plate.

Please refer to the above embodiments for the specific structure of the household appliance, and since the household appliance adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

It is understood that the raw materials for preparing the coating composition are not substances which are restricted or prohibited by domestic and foreign laws and regulations, and harmful substances are not generated during the preparation of the coating composition and during the coating of the article, so that the coating composition, the coating layer, the coated article and the electronic device have the characteristics of safety and environmental protection.

The following are several examples of the preparation process of the coated articles according to the invention:

example 1

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 50% of polysilazane, 40% of polysiloxane and 10% of tourmaline with the particle size range of 0.2-0.3 micron, wherein R of polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing the polysilazane and the polysiloxane at the speed of 600 revolutions per minute, and carrying out copolymerization reaction on the polysiloxane and the polysilazane to generate polysiloxane-polysilazane copolymer;

adding tourmaline into the copolymer, and stirring at the speed of 1000 revolutions per minute to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 50 μm, to obtain the coated article.

Example 2

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 40% of polysilazane, 25% of polysiloxane, 25% of dibutyl ether and 10% of cristobalite with the particle size range of 0.21-0.33 micron, wherein R of polysilazane is ₁ Is aryl, R ₂ Is hydrogen radical, R ₃ Is alkylamino, R of said polysiloxane ₄ Is cycloalkane, R ₅ Is an alkylsiloxy group;

placing polysilazane and polysiloxane into a reactor, mixing the polysilazane and the polysiloxane at the speed of 200 revolutions per minute, and carrying out copolymerization reaction on the polysiloxane and the polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, adding the mirabilite, and stirring at the speed of 1100 revolutions per minute to obtain a coating composition;

the coating composition is coated on the surface of a substrate to form a coating layer with the thickness of 30 micrometers, so as to prepare the coated piece.

Example 3

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 20% of polysilazane, 20% of polysiloxane, 18% of toluene, 10% of isophorone, 10% of aluminum hydroxide with the particle size range of 2-3 micrometers, 10% of silicon carbide with the particle size range of 2-3 micrometers, 10% of opal with the particle size range of 2-3 micrometers and 2% of dimethyl tin, wherein R of polysilazane is ₁ Is an alkene, R ₂ Is an alkylsiloxane, R ₃ Is an alkane, R of said polysiloxane ₄ Is an alkane, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 300 revolutions per minute, adding dimethyl tin, and stirring at the speed of 1000 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding toluene and isophorone into the copolymer, then adding aluminum hydroxide, silicon carbide and opal, and stirring at the speed of 1200 revolutions per minute to obtain a primary coating product;

grinding the primary product to enable the particle size of aluminum hydroxide, silicon carbide and opal to be 0.2-0.6 microns, and obtaining a coating composition;

the coating composition is coated on the surface of a substrate to form a coating with the thickness of 10 microns, and the coated piece is prepared.

Example 4

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 15% of polysilazane, 15% of polysiloxane, 20% of o-xylene, 10% of petroleum ether, 11% of aluminum hydroxide with the particle size range of 2-3 micrometers, 15% of white carbon black with the particle size range of 2-3 micrometers, and 2-3% of particle size10% of micrometer Qicai stone and 4% of dimethyl tin, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is cycloalkane, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is alkylamino, R ₅ Is an alkoxy group;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 500 revolutions per minute, adding dimethyl tin, and stirring at the speed of 1050 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding o-xylene and petroleum ether into the copolymer, then adding aluminum hydroxide, white carbon black and Qicai stone, and stirring at the speed of 1200 r/min to obtain a primary coating product;

grinding the primary product to enable the particle sizes of the aluminum hydroxide, the white carbon black and the Qicai stone to be in the range of 0.2-0.4 microns, and obtaining a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 15 μm, to obtain the coated article.

Example 5

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 12% of polysilazane, 11% of polysiloxane, 17% of n-hexane, 20% of acetone, 4% of attapulgite with the particle size range of 2-3 microns, 4% of white carbon black with the particle size range of 2-3 microns, 14% of magnesium oxide with the particle size range of 2-3 microns, 9.5% of tourmaline with the particle size range of 2-3 microns, 0.5% of lanthanum trioxide with the particle size range of 2-3 microns, 2% of boron nitride with the particle size range of 2-3 microns, 2% of graphene with the particle size range of 2-3 microns, 3% of titanium dioxide with the particle size range of 2-3 microns, and 1% of triethylene tetramine, wherein R of the polysilazane is ₁ Is alkylamino, R ₂ Is alkyl, R ₃ Is aryl, R of the polysiloxane ₄ Is an alkylsiloxane, R ₅ Is cyclane;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 400 rpm, adding triethylene tetramine, stirring at the speed of 1250 rpm to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding n-hexane and acetone into the copolymer, adding attapulgite, white carbon black, magnesium oxide, tourmaline, lanthanum oxide, boron nitride, graphene and titanium dioxide, and stirring at the speed of 1500 revolutions per minute to obtain a primary coating product;

grinding the primary product to enable the particle size of attapulgite, white carbon black, magnesium oxide, tourmaline, lanthanum oxide, boron nitride, graphene and titanium dioxide to be in the range of 0.21-0.33 microns to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 20 μm, to obtain the coated article.

Example 6

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 10% of polysilazane, 10% of polysiloxane, 10% of methyl ethyl ketone, 23% of m-xylene, 30% of alumina with the particle size range of 0.2-0.32 micrometer, 3% of titanium oxide with the particle size range of 0.21-0.32 micrometer, 3% of bentonite with the particle size range of 0.2-0.36 micrometer, 9.5% of cristobalite with the particle size range of 0.2-0.32 micrometer, 0.5% of cerium dioxide with the particle size range of 0.2-0.32 micrometer, and 1% of triphenyltin, wherein R of the polysilazane is ₁ Is aryl, R ₂ Is aryl, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is an alkene, R ₅ Is a hydrogen radical;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 500 revolutions per minute, adding triphenyltin, and stirring at the speed of 1750 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding methyl ethyl ketone and m-xylene into the copolymer, then adding alumina, titanium oxide, bentonite, mirabilite and cerium dioxide, and stirring at the speed of 1500 revolutions per minute to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 35 μm, to obtain the coated article.

Example 7

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 8% of polysilazane, 7% of polysiloxane, 49% of toluene, 17% of aluminum oxide with the particle size range of 2-3 microns, 5% of zinc oxide with the particle size range of 2-3 microns, 3% of ceramic microspheres with the particle size range of 0.2-0.3 microns, 9.5% of opal with the particle size range of 2-3 microns, 0.5% of lanthanum phosphate with the particle size range of 2-3 microns and 1% of palladium acetate salt, wherein R of polysilazane is ₁ Is an alkane, R ₂ Is an alkane, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is alkoxy, R ₅ Is an alkoxy group;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 300 revolutions per minute, adding palladium acetate salt, and stirring at the speed of 1200 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding toluene into the copolymer, then adding alumina, zinc oxide, opal and lanthanum phosphate, and stirring at the speed of 1500 rpm to obtain a primary coating product;

grinding the primary product to enable the particle size of alumina, zinc oxide, opal and lanthanum phosphate to be in the range of 0.22-0.52 microns, and adding ceramic microspheres to obtain a primary coating product;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 40 μm, to obtain the coated article.

Example 8

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 6% of polysilazane, 4% of polysiloxane, 25.5% of diethyl ether, 30% of p-xylene, 10% of white carbon black with particle size ranging from 0.23 to 0.36 microns, 12% of aluminum hydroxide with particle size ranging from 0.23 to 0.36 microns, 2% of glass microspheres with particle size ranging from 0.22 to 0.35 microns, 9.5% of Qicai stone with particle size ranging from 0.23 to 0.34 microns, and 30.5% of p-xylene0.5 percent of neodymium phosphate with the circumference of 0.23-0.34 micron and 0.5 percent of N, N-dimethylaniline, wherein R of the polysilazane ₁ Is an alkene, R ₂ Is aryl, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is an alkane, R ₅ Is an alkane;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 500 revolutions per minute, adding N, N-dimethylaniline, and stirring at the speed of 1050 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding diethyl ether and p-xylene into the copolymer, adding white carbon black, aluminum hydroxide, glass microspheres, Qicai stone and neodymium phosphate, and stirring at the speed of 1700 revolutions per minute to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 45 μm, to obtain the coated article.

Example 9

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 30% of polysilazane, 35% of polysiloxane, 15% of dibutyl ether, 15% of tourmaline with the particle size range of 0.23-0.35 micron, 2% of celestite with the particle size range of 0.23-0.35 micron and 3% of triethylene diamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 600 revolutions per minute, adding triethylenediamine, and stirring at the speed of 1500 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, adding tourmaline and celestite, and stirring at 1000 rpm to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 55 μm, to obtain the coated article.

Example 10

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 40% of polysilazane, 35% of polysiloxane, 15% of dibutyl ether, 5% of tourmaline with the particle size range of 0.23-0.35 micron and 5% of triethylene diamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of the polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 200 revolutions per minute, adding triethylene diamine, and stirring at the speed of 1200 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, adding tourmaline, and stirring at 1200 rpm to obtain a coating composition;

the coating composition is coated on the surface of a substrate to form a coating layer with the thickness of 60 micrometers, so as to prepare the coated piece.

Example 11

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 50% of polysilazane, 28% of polysiloxane, 15% of dibutyl ether, 2% of tourmaline with the particle size range of 0.23-0.35 micron and 5% of triethylene diamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 400 rpm, adding triethylenediamine, and stirring at the speed of 1250 rpm to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, then adding tourmaline, and stirring at the speed of 1300 revolutions per minute to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 65 μm, to obtain the coated article.

Example 12

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 50% of polysilazane, 29% of polysiloxane, 10% of dibutyl ether, 5% of silicon carbide with the particle size range of 0.23-0.35 micrometer, 1% of tourmaline with the particle size range of 0.23-0.35 micrometer and 5% of triethylene diamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 220 revolutions per minute, adding triethylene diamine, and stirring at the speed of 1200 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, adding silicon carbide and tourmaline, and stirring at 1200 rpm to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 70 μm, to obtain the coated article.

Example 13

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 50% of polysilazane, 20% of polysiloxane, 10% of dibutyl ether, 5% of alumina with the particle size range of 0.23-0.35 micrometer, 8% of cherokee with the particle size range of 0.23-0.35 micrometer, 2% of opal with the particle size range of 0.23-0.35 micrometer, and 5% of triethylene diamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 300 revolutions per minute, adding triethylene diamine, and stirring at the speed of 1300 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, then adding alumina, Qicai stone and opal, and stirring at 1800 rpm to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 75 μm, to obtain the coated article.

Example 14

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 50% of polysilazane, 20% of polysiloxane, 10% of dibutyl ether, 5% of silicon carbide with the particle size range of 2.3-3.5 microns, 7% of tourmaline with the particle size range of 2.3-3.5 microns, 3% of mirabilite with the particle size range of 2.3-3.5 microns and 5% of triethylenediamine, wherein R of the polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at a speed of 100 revolutions per minute, adding dimethyl tin, and stirring at a speed of 1100 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding dibutyl ether into the copolymer, adding silicon carbide, tourmaline and tourmaline, and stirring at 1100 r/min to obtain a primary coating product;

grinding the primary product to make the particle size of silicon carbide, tourmaline and mirabilite be 0.2-0.3 micron to obtain a coating composition;

the coating composition is coated on the surface of a substrate to form a coating with the thickness of 80 microns, and the coated piece is prepared.

Example 15

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 20% of polysilazane or polysiloxane15% of alkane, 4% of p-xylene, 50% of silicon carbide with the particle size range of 2-3 microns, 6% of tourmaline with the particle size range of 2-3 microns, 3% of mirabilite with the particle size range of 2-3 microns, 1% of opal with the particle size range of 2-3 microns and 1% of triethylenediamine, wherein R of polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of said polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing polysilazane and polysiloxane at the speed of 500 revolutions per minute, adding triethylene diamine, and stirring at the speed of 1550 revolutions per minute to promote the copolymerization reaction of polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer;

adding p-xylene into the copolymer, then adding silicon carbide, tourmaline, opal and mirabilite, and stirring at the speed of 1900 r/min to obtain a coating initial product;

grinding the primary product to make the particle size of silicon carbide, tourmaline, opal and mirabilite be 0.2-0.3 micron to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 85 μm, to obtain the coated article.

Example 16

Providing preparation raw materials, wherein the preparation raw materials comprise the following components in percentage by mass: 25% of polysilazane, 25% of polysiloxane, 20% of p-xylene, 20% of silicon carbide with the particle size range of 2-3 microns, 5% of tourmaline with the particle size range of 2-3 microns, 4% of cristobalite with the particle size range of 2-3 microns and 1% of cerium oxide with the particle size range of 2-3 microns, wherein R of polysilazane is ₁ Is hydrogen radical, R ₂ Is hydrogen radical, R ₃ Is a hydrogen radical, R of the polysiloxane ₄ Is hydrogen radical, R ₅ Is an alkene;

placing polysilazane and polysiloxane into a reactor, mixing the polysilazane and polysiloxane at the speed of 200 revolutions per minute, stirring at the speed of 1600 revolutions per minute, and carrying out copolymerization reaction on the polysiloxane and the polysilazane to generate polysiloxane-polysilazane copolymer;

adding p-xylene into the copolymer, then adding silicon carbide, tourmaline, mirabilite and cerium oxide, and stirring at the speed of 1600 revolutions per minute to obtain a coating initial product;

grinding the primary product to ensure that the particle sizes of the silicon carbide, the tourmaline, the mirabilite and the cerium oxide are in the range of 0.2-0.26 micron to obtain a coating composition;

the coating composition was applied to the surface of a substrate to form a coating layer having a thickness of 90 μm, to obtain the coated article.

The coated articles of examples 1-16 were tested for hardness, adhesion, temperature resistance, and negative ion release, and the results are shown in Table 1.

TABLE 1 physical Property test results of the coated article

The hardness of the coated pieces of examples 1-16 was tested according to GB/T6739-1696 (film hardness test method), which shows that the range of the hardness of the coated pieces is 6-9H, indicating that the coated pieces of examples 1-16 all have better hardness.

The adhesion of the coated articles of examples 1-16 was tested according to GB/T9286 (adhesion test method) and showed that the adhesion of each coated article in the hundred cells reached a rating of 0, indicating that the coated articles of examples 1-16 also had better adhesion.

The weight loss of the coated articles of examples 1-16 was tested according to GB/T9286 (temperature resistance test) and showed that the temperature resistance of the coated articles of examples 1-16 was also better.

The negative ion release amount of the coated articles of examples 1 to 16 was measured using an air negative ion detector (MODEL No. MODEL COM-3010 PRO). It was shown that the coated articles of examples 1 to 16 had a high negative ion release amount.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which can be directly or indirectly applied to other related technical fields without departing from the spirit of the present invention, are included in the scope of the present invention.

Claims

1. The coating composition is characterized in that raw materials for preparing the coating composition comprise polysilazane, polysiloxane, an anion agent and a catalyst, wherein the anion agent is selected from at least one of mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one of mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt, and the polysilazane has a structural formula as follows:

wherein R is ₁ Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₂ Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₃ Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, the R is ₁ And R ₂ Is a hydrogen radical or an alkene, the polysiloxane having the formula:

wherein R is ₄ Is hydrogen radical, alkane, alkene, aryl, alkoxy or alkyl siloxy, R ₅ Is hydrogen, alkane, alkene, aryl, alkoxy or alkyl siloxy;

mixing the polysilazane and the polysiloxane, and carrying out copolymerization reaction on the polysilazane and the polysiloxane to generate a polysilazane-polysiloxane copolymer;

the polysilazane accounts for 10-70% of the mass of the preparation raw material, the polysiloxane accounts for 10-60% of the mass of the preparation raw material, and the negative ion agent accounts for 0.01-15% of the mass of the preparation raw material; the catalyst accounts for 0.01-5% of the mass of the preparation raw material, and is an amine catalyst and/or a metal catalyst; the catalyst can accelerate the copolymerization reaction of the polysilazane and the polysiloxane;

the metal catalyst is an organic tin catalyst and/or a palladium catalyst, and the organic tin catalyst is at least one selected from dibutyltin dilaurate, stannous octoate, dimethyl tin and triphenyl tin; the palladium catalyst is at least one selected from carbon/palladium, palladium chloride, palladium propionate salt, palladium acetate salt and palladium triphenyl phosphine.

2. The coating composition according to claim 1, wherein the raw material further comprises a solvent, the solvent accounts for 10-66% of the raw material by mass, and the solvent is at least one selected from alkane solvents, ether solvents, ketone solvents, and benzene derivative solvents.

3. The coating composition of claim 2, wherein the alkane solvent is selected from at least one or more of n-hexane, n-octane, n-decane, chloroform, dichloromethane, dichloroethylene, and mineral oil; the ether solvent is at least one selected from diethyl ether, petroleum ether and dibutyl ether; the ketone solvent is selected from at least one of acetone, methyl ethyl ketone, cyclohexanone and isophorone; the benzene derivative solvent is at least one selected from toluene, m-xylene, p-xylene, o-xylene, and chlorobenzene.

4. The coating composition of claim 1, wherein the amine catalyst is selected from one or more of aliphatic amine, alicyclic amine, alcohol amine, and aromatic amine, and the aliphatic amine is selected from at least one of diethylamine, triethylamine, and triethylenetetramine; the alicyclic amine is at least one selected from triethylene diamine, piperazine, piperidine and morpholine; the alcohol amine is selected from at least one of N, N-dimethylethanolamine, diisopropanolamine and N, N-diethylethanolamine; the aromatic amine is selected from at least one of aniline, o-phenylenediamine, benzidine and N, N-dimethylaniline.

5. The coating composition of claim 1, wherein the raw materials for preparation further comprise a filler, the filler accounts for 1-50% of the raw materials for preparation by mass, and the filler is selected from at least one of silicon carbide, alumina, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black, attapulgite, kaolin, bentonite, glass microspheres, and ceramic microspheres.

6. The coating composition according to claim 1, wherein the raw materials for preparation further comprise a filler, a solvent and a catalyst, the filler accounts for 1 to 50% by mass of the raw materials for preparation, the solvent accounts for 10 to 66% by mass of the raw materials for preparation, the catalyst accounts for 0.01 to 5% by mass of the raw materials for preparation, and the polysiloxane and polysilazane accounts for 10 to 80% by mass of the raw materials for preparation.

7. A method for preparing a coating composition for home appliances, comprising the steps of:

providing polysilazane, polysiloxane and an anion agent, wherein the anion agent is at least one selected from mirabilite, tourmaline, opal and mirabilite, or the anion agent is a mixture of at least one selected from mirabilite, tourmaline, opal and mirabilite and rare earth oxide and/or rare earth composite salt, and the polysilazane has a structural formula as follows:

wherein R is ₁ Is hydrogen radical, alkane, alkene, aryl, alkoxy,Alkylsiloxy or alkylamino radical, R ₂ Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R ₃ Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, the R is ₁ And R ₂ Is a hydrogen radical or an alkene, the polysiloxane having the formula:

the polysilazane and the polysiloxane are mixed, the polysilazane and the polysiloxane are subjected to copolymerization reaction to generate a polysilazane-polysiloxane copolymer, a catalyst is added into the polysilazane and the polysiloxane, the catalyst accounts for 0.01-5% of the mass percentage of the preparation raw materials, and the catalyst is an amine catalyst and/or a metal catalyst; the catalyst can accelerate the copolymerization reaction of the polysilazane and the polysiloxane;

adding an anion agent into the polysilazane-polysiloxane copolymer to prepare the coating composition;

the polysilazane accounts for 10-70% of the mass of the preparation raw material, the polysiloxane accounts for 10-60% of the mass of the preparation raw material, and the negative ion agent accounts for 0.01-15% of the mass of the preparation raw material;

the metal catalyst is an organic tin catalyst and/or a palladium catalyst, and the organic tin catalyst is at least one selected from dibutyltin dilaurate, stannous octoate, dimethyl tin and triphenyl tin; the palladium catalyst is at least one selected from carbon/palladium, palladium chloride, palladium propionate salt, palladium acetate salt and palladium triphenylphosphine.

8. The method of preparing a coating composition according to claim 7, wherein after forming the polysilazane-polysiloxane copolymer and before preparing the coating composition, the method further comprises: and adding a filler into the polysilazane-polysiloxane copolymer, wherein the filler accounts for 1-50% of the mass of the preparation raw materials, and the filler is selected from at least one of silicon carbide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, aluminum hydroxide, white carbon black, attapulgite, kaolin, bentonite, glass microspheres and ceramic microspheres.

9. The method of preparing a coating composition according to claim 7, wherein after forming the polysilazane-polysiloxane copolymer and before preparing the coating composition, the method further comprises: and adding a solvent into the polysilazane-polysiloxane copolymer, wherein the solvent accounts for 10-66% of the mass of the preparation raw material, and the solvent is selected from at least one of alkane solvents, ether solvents, ketone solvents and benzene derivative solvents.

10. A coated article comprising a substrate and a coating layer formed on a surface of the substrate, wherein the coating layer contains the coating composition according to any one of claims 1 to 6.

11. The coated article of claim 10, wherein the coating has a thickness in a range from 1 micron to 100 microns.

12. A method of making a coated article comprising the steps of:

providing a substrate and a coating composition according to any one of claims 1 to 6;

13. A household appliance, characterized in that it comprises a coating element according to claim 10 or 11.