CN109321132B

CN109321132B - Coating composition, coated part, preparation method of coated part and household appliance

Info

Publication number: CN109321132B
Application number: CN201811172158.1A
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: 2022-01-25
Anticipated expiration: 2038-10-08
Also published as: WO2020073888A1; CN109321132A

Abstract

The invention provides a 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 coating composition contains polysilazane and gas-phase silicon dioxide, and the chemical structure of the polysilazane is as follows:

wherein R is₁、R₂And R₃At least one of the three is a low surface energy group that is a hydrogen group, a siloxy group, an alkylsiloxy group, a fluoroalkyl group, or an alkyl fluoroether. The coating piece prepared from the coating composition has the advantages of high hardness, good adhesiveness, good temperature resistance, easy cleaning and capability of reaching the food contact safety level.

Description

Coating composition, coated part, preparation method of coated part and household appliance

Technical Field

The invention relates to the technical field of household appliances, in particular to a 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 electrical product, and the coating is mainly made of the following materials: enamel (the enamel can be formed on the surface of a product by an enamel process), organic silicon, epoxy powder (the epoxy powder can be sprayed on the surface of the product by a powder spraying mode), or silica sol and organic silicon hybrid coating. However, the coating has the disadvantages of low hardness, poor adhesion, poor temperature resistance, difficulty in cleaning, potential food contact safety hazards and the like.

Disclosure of Invention

The invention mainly aims to provide a coating composition, aiming at ensuring that a coating prepared from the coating composition has the advantages of high hardness, good adhesiveness, good temperature resistance, easy cleaning and capability of reaching the food contact safety level.

In order to solve the technical problems, the coating composition provided by the invention contains polysilazane and fumed silica, and the chemical structure of the polysilazane is as follows:

wherein R is₁、R₂And R₃At least one of the three is a low surface energy group which is a hydrogen group and a siloxane groupAn alkylsiloxy group, a fluoroalkyl group, or an alkyl fluoroether.

Further, said R₁、R₂And R₃Any one or two of the three are alkyl, aryl, alkene, alkoxy, or cycloalkyl.

Further, the polysilazane accounts for 10-80% of the coating composition by mass, and the fumed silica accounts for 2-40% of the coating composition by mass.

Further, the polysilazane accounts for 10-60% of the coating composition by mass, and the fumed silica accounts for 2-30% of the coating composition by mass.

Furthermore, the coating composition also contains a solvent, and the solvent accounts for 10-80% of the coating composition by mass.

Further, the solvent is at least one selected from the group consisting of an alkane solvent, an ether solvent, a ketone solvent, and a benzene derivative solvent.

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.

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

Further, the thickness of the top coat ranges from 0.01 micrometers to 100 micrometers.

Furthermore, the coating piece also comprises a primer layer formed between the substrate and the surface coating layer, the primer layer is prepared from polysilazane and polysiloxane, and the polysilazane and polysiloxane undergo copolymerization reaction to generate a polysilazane-polysiloxane copolymer.

Further, the polysilazane accounts for 6-96% of the preparation raw material by mass, and the polysiloxane accounts for 4-94% of the preparation raw material by mass.

Further, the primer layer has a thickness ranging from 0.01 to 100 micrometers.

Further, the structural formula of the polysilazane in the preparation raw material is as follows:

wherein R is₄Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R₅Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R₆Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, alkyl siloxane radical or alkyl amine radical.

Further, said R₄And R₅At least one of which is a hydrogen radical or an alkene.

Furthermore, the molecular weight of polysilazane in the preparation raw material is 100-1000.

Further, the polysiloxane has the structural formula:

wherein R is₇Is hydrogen radical, alkane, cycloalkane, alkene, aryl, alkoxy, or alkyl siloxy, R₈Is hydrogen radical, alkane, cyclane, alkene, aryl, alkoxy or alkyl siloxy.

Furthermore, the molecular weight of the polysiloxane is 100-1300.

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 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 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 and a catalyst, wherein the filler accounts for 1-50% of the mass of the preparation raw materials, the catalyst accounts for 10-66% of the mass of the preparation raw materials, and the polysiloxane and the polysilazane account for 0.01-5% of the mass of the coating composition.

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 top coating on the surface of the substrate to obtain the coated piece.

Further, the preparation method also comprises the following steps:

providing a raw material for preparing a primer layer, wherein the raw material for preparing the primer layer comprises: polysilazanes and polysiloxanes;

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

and coating the primer composition on the surface of a substrate to form a primer layer, coating the coating composition on the surface of the primer layer, and forming the top coat on the surface of the primer layer to obtain the coated piece.

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

In the coating composition of the technical scheme of the inventionContains polysilazane and fumed silica, said fumed silica being uniformly dispersed in said polysilazane. R in the polysilazane₁、R₂And R₃At least one of the three groups is a low surface energy group, the low surface energy group is hydrogen group, siloxy group, alkyl siloxy group, fluoroalkyl group or alkyl fluoroether, and the low surface energy group can enable the polysilazane to have the characteristic of easy cleaning, so that a top coating prepared from the coating composition also has the advantage of easy cleaning. In addition, the fumed silica can ensure that the top coating prepared from the coating composition has the advantages of high hardness, good adhesion and good temperature resistance. Furthermore, the polysilazane and the gas phase silicon dioxide do not belong to toxic and harmful substances, so that the surface coating prepared from the coating composition can reach the food contact safety level.

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 coating composition contains polysilazane and gas-phase silicon dioxide, and the chemical structure of the polysilazane is as follows:

wherein R is₁、R₂And R₃At least one of the three is a low surface energy group that is a hydrogen group, a siloxy group, an alkylsiloxy group, a fluoroalkyl group, or an alkyl fluoroether.

In one embodiment of the present invention, R₁、R₂And R₃All three are low surface energy groups.

In another embodiment of the present invention, R₁、R₂And R₃One of the three is a low surface energy group.

In yet another embodiment of the present invention, R₁、R₂And R₃Two of the three are low surface energy groups.

The coating composition provided by the technical scheme of the invention contains polysilazane and fumed silica, and the fumed silica is uniformly dispersed in the polysilazane. R in the polysilazane₁、R₂And R₃At least one of the three groups is a low surface energy group, the low surface energy group is hydrogen group, siloxy group, alkyl siloxy group, fluoroalkyl group or alkyl fluoroether, and the low surface energy group can enable the polysilazane to have the characteristic of easy cleaning, so that a top coating prepared from the coating composition also has the advantage of easy cleaning. In addition, the fumed silica can ensure that the top coating prepared from the coating composition has the advantages of high hardness, good adhesion and good temperature resistance. Furthermore, the polysilazane and the gas phase silicon dioxide do not belong to toxic and harmful substances, so that the surface coating prepared from the coating composition can reach the food contact safety level.

In an embodiment of the present invention, R is₁、R₂And R₃Any one or two of the three are alkyl, aryl, alkene, alkoxy, or cycloalkyl.

In one embodiment of the present invention, R₁Is a low surface energy group, R₂And R₃Is alkyl, aryl, alkene, alkoxy, or cycloalkyl.

In another embodiment of the present invention, R₁And R₃Is a low surface energy group, R₂Is alkyl, aryl, alkene, alkoxy, or cycloalkyl.

In yet another embodiment of the present invention, R₂Is a low surface energy group, R₁And R₃Is alkyl, aryl, alkene, alkoxy, or cycloalkyl.

It can be understood that R can be set according to actual requirements₁、R₂And R₃The kind of (2).

In addition, R is₁、R₂And R₃Other groups that perform the same or similar function are also contemplated and are not intended to be limiting.

The polysilazane accounts for 10-80% of the coating composition by mass, and the fumed silica accounts for 2-40% of the coating composition by mass.

Specifically, the polysilazane comprises 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80% of the coating composition by mass.

Specifically, the fumed silica can comprise 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 20%, 30%, or 40% by mass of the coating composition.

In an embodiment of the invention, the polysilazane accounts for 10-60% of the coating composition by mass, and the fumed silica accounts for 2-30% of the coating composition by mass.

In an embodiment of the invention, the polysilazane accounts for 10 to 80% of the coating composition by mass. Preferably, the polysilazane accounts for 20 to 70 mass percent of the coating composition, more preferably 30 to 50 mass percent, and even more preferably 40 to 45 mass percent.

In an embodiment of the invention, the fumed silica accounts for 2 to 40% of the coating composition by mass. Preferably, the fumed silica accounts for 5-30% of the coating composition by mass, more preferably 5-20%, and even more preferably 10-20%.

It will be appreciated that the amounts of polysilazane, fumed silica, and solvent in the coating composition can be adjusted as desired.

The molecular formula of the fumed silica is SiO₂The coating is white fluffy powder, has the characteristics of porosity, no toxicity, no odor, no pollution and the like, and can obviously improve the high hardness, good adhesion and good temperature resistance of the surface coating.

According to the technical scheme, the polysilazane accounts for 10-80% of the coating composition by mass, the fumed silica accounts for 2-40% of the coating composition by mass, and after the polysilazane and the fumed silica are mixed, a top coating which is high in hardness, good in adhesion, good in temperature resistance, easy to clean and capable of reaching the food contact safety level can be formed on the surface of a substrate.

The coating composition also contains a solvent, and the solvent accounts for 10-80% of the coating composition by mass.

Specifically, the solvent accounts for 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80% by mass of the coating composition.

In an embodiment of the invention, the solvent accounts for 10-80% of the coating composition by mass. Preferably, the solvent accounts for 20-70% of the coating composition by mass, more preferably 30-50%, and even more preferably 40-45%.

The solvent may be at least one selected from the group consisting of 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 is understood that the amount and type of solvent in the coating composition can be adjusted according to actual needs.

It should be noted that the solvent may also be other reagents that can dissolve polysilazane, and the invention is not limited thereto.

The coating composition of the technical scheme of the invention contains the solvent, and the polysilazane is soluble in the solvent, so that the coating composition can be easily formed on the surface of a substrate.

In an embodiment of the present invention, the coating composition further includes a coloring material, and the coloring material is 0.01 to 5% by mass of the coating composition, preferably 0.1 to 5% by mass, more preferably 1 to 5% by mass, and even more preferably 2 to 3% by mass.

It will be appreciated that the fumed silica also enhances the vibrancy of the colorant to give the topcoat a better appearance.

The pigment is selected from at least one of a white pigment, a yellow pigment, an orange pigment, a black pigment, a purple pigment, a brown pigment, a green pigment, a blue pigment, a gray pigment, and a red pigment, so that a top coating prepared by the coating composition has a colorful 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 antitony) and/or Chrome brown (Chrome titanate brown).

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

The black pigment is selected from Copper chromium black spinel (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 colorants can be selected according to the actual requirements to give the top coat a better appearance.

It will be appreciated that the components of the coating composition of the invention, such as polysilazane, solvent, fumed silica, and colorant, are not toxic or harmful substances, so that the top coat made from the coating composition also has the advantage of achieving a level of food contact safety.

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

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

It is understood that the top coat made from the coating composition has a thermal weight loss of less than 5% in an oxygen environment at 500 ℃, indicating that the top coat 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 top coat is in the range of 0.01 to 100 micrometers, preferably 1 to 80 micrometers, more preferably 2 to 50 micrometers, and even more preferably 5 to 20 micrometers.

The topcoat can have a thickness of 0.01 microns, 1 micron, 2 microns, 5 microns, 10 microns, 20 microns, 50 microns, or 100 microns.

It will be appreciated that the thickness of the topcoat can be adjusted to the actual requirements.

According to the technical scheme, the thickness of the surface coating can be 1-100 micrometers, and after the surface coating with the thickness is formed on the surface of the substrate, the surface coating can effectively protect the substrate, so that the coating piece has the advantages of easiness in cleaning, capability of reaching the food contact safety level and the like.

The coating piece also comprises a primer layer formed between the substrate and the surface coating, wherein the primer layer is prepared from polysilazane and polysiloxane, and the polysilazane and polysiloxane are subjected to copolymerization reaction to generate a polysilazane-polysiloxane copolymer.

In an embodiment of the present invention, the polysilazane is 6 to 96% by mass of the preparation raw material, and the polysiloxane is 4 to 94% by mass of the preparation raw material.

In an embodiment of the invention, the polysilazane accounts for 6-96% of the raw material. Preferably, the polysilazane accounts for 10-80% 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 4-94% of the preparation raw material by mass. Preferably, the polysiloxane accounts for 10-70% of the mass of the preparation raw materials, more preferably 15-60%, and even more preferably 20-50%.

The raw materials for preparing the primer layer comprise polysilazane and polysiloxane. The polysilazane and polysiloxane undergo a copolymerization reaction to form a polysilazane-polysiloxane copolymer. The polysilazane-polysiloxane copolymer has the advantages of high hardness, good adhesion and good temperature resistance, and the polysilazane-polysiloxane copolymer is not a toxic and harmful substance, so that a coating member with the primer layer has the advantages of high hardness, good adhesion, good temperature resistance and food contact safety.

The thickness of the primer layer ranges from 0.01 micrometers to 100 micrometers, preferably from 1 micrometer to 80 micrometers, more preferably from 2 micrometers to 50 micrometers, and further preferably from 5 micrometers to 20 micrometers.

The primer layer can have a thickness of 0.01 microns, 1 micron, 2 microns, 5 microns, 10 microns, 20 microns, 50 microns, or 100 microns.

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

According to the technical scheme, the thickness of the primer layer can be 1-100 micrometers, after the primer layer with the thickness is formed on the surface of the substrate, the primer layer can effectively protect the substrate, the connection strength between the surface coating and the substrate is improved, and the coating piece has the advantages of high hardness, good adhesion, good temperature resistance and food contact safety.

The structural formula of polysilazane in the preparation raw material is as follows:

The polysiloxane has the structural formula:

In one embodiment of the present invention, R₄And R₅At 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, R₄、R₅And R₆Can be the same group or different groups, and can be adjusted according to actual requirements.

Understandably, R₇And R₈Can be the same group or different groups, and can be adjusted according to actual requirements.

In addition, R is₄、R₅And R₆Other groups capable of achieving the same or similar functions can be used, and the invention is not limited to the groups; r₇And R₈Other 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 main body resin of the primer composition, so that the primer layer prepared from the primer composition has the advantages of high hardness, good adhesion, good temperature resistance and food contact safety level.

The molecular weight of polysilazane in the preparation raw materials is 100-1000, and the molecular weight of 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 primer composition containing the polysilazane-polysiloxane copolymer is formed on a substrate to form a primer layer, the primer layer has good hardness, adhesiveness and temperature resistance.

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.

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 formed on the surface of a substrate relatively easily.

The preparation raw material also comprises a catalyst, wherein 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 may be selected from at least one of triethylenediamine, 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.

The catalyst can accelerate the copolymerization reaction between polysilazane and polysiloxane, thereby producing the polysilazane-polysiloxane copolymer in a short time.

The preparation raw materials also comprise fillers, and the fillers account 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 particle size of the filler may be less than 3 microns, preferably less than 2 microns, more preferably 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 primer layer is relatively flat.

In another embodiment of the invention, the particle size of the filler is in a range of 0.2-0.5 microns to obtain a smoother primer layer.

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 present invention, after the filler is added to the polysilazane-polysiloxane copolymer, an initial product of the primer layer is obtained, which may be subjected to a grinding treatment to reduce the particle size of the filler in the primer composition.

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

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 primer layer.

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.

It can be understood that the polysilazane, the polysiloxane, the solvent, the catalyst and the filler in the primer composition of the invention are not toxic or harmful substances, so that the primer layer prepared from the preparation raw material has the advantage of food contact safety.

In an embodiment of the present invention, the raw material for preparing the primer layer includes: polysiloxane, polysilazane, filler, solvent, and catalyst. The polysiloxane and the polysilazane account for 10-80% 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.

providing a substrate, polysilazane, a solvent and fumed silica;

adding a solvent into the polysilazane, stirring at a speed of 100-700 rpm, preferably 200-400 rpm, adding fumed silica, and stirring at a speed of 100-2000 rpm, preferably 1000-1500 rpm, so as to uniformly mix the polysilazane, the solvent and the fumed silica, thereby obtaining the coating composition.

It will be appreciated that pigments may also be added to the polysilazane when fumed silica is added to give the top coat a better appearance.

It is understood that when the coating composition is formed on the surface of the substrate, the substrate is subjected to a heating treatment at a temperature of less than 300 ℃, preferably 100 ℃ to 280 ℃, and more preferably 120 ℃ to 150 ℃ to cure the coating composition on the surface of the substrate to form a top coat. The thickness of the topcoat can range from 1 to 100 microns.

In an embodiment of the present invention, the substrate may be pretreated, such as oil removal, cleaning, and drying, to clean the surface of the substrate and improve the adhesion of the top coating to the surface of the substrate.

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 also has the advantage of low energy consumption.

The preparation method of the coating piece has the advantages of reducing the process difficulty of the preparation method of the coating piece due to the fact that the top coating has good adhesiveness and does not need to carry out pretreatment such as sanding on the matrix, and being environment-friendly compared with the technical scheme that sanding treatment needs to be carried out on the matrix in the prior art.

The preparation method also comprises the following steps:

the primer composition is coated on the surface of the substrate to form a primer layer, the coating composition is coated on the primer layer, and the top coat is formed on the surface of the primer layer to obtain the coated piece.

It will be appreciated that the coating composition may be abraded prior to applying the abraded coating composition to the surface of the substrate.

In an 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, so that 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 should be noted that the stirring rate of the first stirring treatment and the time of the copolymerization reaction may be other values, and the present invention is not limited thereto.

It is understood that the primer composition may be applied to the substrate by spray coating, spin coating, curtain coating, dip coating, etc., and then subjected to a curing process, which may be heat curing or UV curing, to form the primer layer.

After mixing the polysilazane and the polysiloxane, the method for preparing the primer 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 rate 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.

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

In the technical solution of the present invention, a catalyst may be added to polysilazane and polysiloxane to promote the copolymerization reaction of polysiloxane and polysilazane, so as to generate the main resin of the primer composition of the present invention, i.e., polysiloxane-polysilazane copolymer.

After the formation of the polysilazane-polysiloxane copolymer, a filler and/or a solvent may be added to the polysilazane-polysiloxane copolymer before obtaining the primer composition.

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

In one embodiment of the present invention, after the solvent and the filler are added to the polysilazane-polysiloxane copolymer, a third stirring process may be performed to uniformly mix the polysilazane-polysiloxane copolymer, the solvent and the filler.

It will be appreciated that the polysilazane-polysiloxane copolymer may be first treated by adding the solvent, then the filler, and then subjected to a third agitation. The solvent and the filler can also be added into the polysilazane-polysiloxane copolymer at the same time, and the third stirring treatment is carried out on the polysilazane-polysiloxane copolymer. Or only adding the solvent/filler into the polysilazane-polysiloxane copolymer, and carrying out stirring treatment for the third time.

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.

It can be understood that when the particle size of the filler is set to be 0.2-0.8 micrometers, the filler can be uniformly dispersed in the polysilazane-polysiloxane copolymer, and the surface of the prepared primer layer is relatively flat.

In another embodiment of the invention, the unit of the particle size of the filler is 0.2-0.5 micron, so as to obtain a smoother primer layer.

In another embodiment of the present invention, a filler with a larger particle size may be directly added to the polysilazane-polysiloxane copolymer to obtain a primary product of the primer layer, and then the primary product of the primer layer may be subjected to a grinding process to reduce the particle size of the filler in the primary product.

The time of the grinding treatment can be 30 to 60 minutes, and preferably 40 to 50 minutes. The grinding time can be adjusted according to actual requirements to obtain the filler with corresponding particle size.

In the preparation method of the primer layer, the adding sequence and the grinding mode of each component can be adjusted according to actual requirements, and the stirring speed, the stirring time, the grinding time and the like are only typical values in the preparation process and can be adjusted according to actual requirements.

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 coating member, and since the home appliance adopts all the 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 can be understood that the raw materials for preparing the finishing paint layer and the priming paint layer are not substances which are limited or prohibited by domestic and foreign laws and regulations, and harmful substances are not generated in the preparation process of the coating piece, so that the finishing paint layer, the priming paint layer, the coating piece and the electronic device have the advantages of safety and environmental protection.

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

example 1

The preparation method of the coated piece comprises the following steps:

providing a substrate;

polysilazanes and fumed silicas, R of the polysilazanes₁Is hydrogen radical, R₂Is fluoroalkyl, R₃Is aryl, wherein the polysilazane accounts for 70 percent of the mass of the coating composition, and the fumed silica accounts for 30 percent of the mass of the coating composition;

mixing polysilazane, paraxylene, and fumed silica, and stirring at a speed of 300 revolutions per minute to obtain a coating composition;

the coating composition is coated on the surface of a substrate, and a top coating with the thickness of 40 microns is formed on the surface of the substrate to obtain the coated piece.

Example 2

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing polysilazane, paraxylene, fumed silica and titanium white, R of the polysilazane₁Is hydrogen radical, R₂Is fluoroalkyl, R₃Mixing polysilazane, paraxylene, fumed silica and titanium dioxide, and stirring at the speed of 400 r/min to obtain a coating composition, wherein the polysilazane accounts for 40% by mass of the coating composition, the paraxylene accounts for 40% by mass of the coating composition, the fumed silica accounts for 15% by mass of the coating composition, and the titanium dioxide accounts for 5% by mass of the coating composition;

Example 3

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazanes and polysiloxanes, wherein R of the polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 60 percent of the mass of the preparation raw material, and the R of the polysiloxane₇Is hydrogen radical, R₈The polysiloxane accounts for 40 percent of the mass of the preparation raw material;

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 to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 70 microns;

providing poly-siliconAzanes, p-xylene and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is alkyl, R₃Is a hydrogen radical;

mixing polysilazane and paraxylene, stirring at a speed of 100 revolutions per minute to dissolve the polysilazane in the paraxylene to obtain a solution, adding fumed silica to the solution, and stirring at a speed of 1000 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 80% by mass of the coating composition, the paraxylene accounts for 18% by mass of the coating composition, and the fumed silica accounts for 2% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 20 μm, and the coated article was obtained.

Example 4

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, cyclohexanone, alumina with the particle size range of 0.2-0.4 micrometer and dibutyltin dilaurate, wherein R of the polysilazane₄Is aryl, R₅Is hydrogen radical, R₆Is alkylamino radical, the polysilazane accounts for 40 percent of the mass range of the preparation raw material, and R of the polysiloxane₇Is cycloalkane, R₈The modified silicon dioxide is an alkyl siloxane group, the polysiloxane accounts for 25% of the mass of the preparation raw material, the dibutyl ether accounts for 20% of the mass of the preparation raw material, the cyclohexanone accounts for 4% of the mass of the preparation raw material, the alumina accounts for 8% of the mass of the preparation raw material, and the dibutyl tin dilaurate accounts for 3% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 200 revolutions per minute, adding dibutyltin dilaurate to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether and cyclohexanone into the copolymer, then adding aluminum oxide into the copolymer, and stirring at the speed of 1200 revolutions per minute to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 25 microns;

providing polysilazane, p-dibutyl ether, and fumed silica, wherein R of the polysilazane₁Is fluoroalkyl, R₂Is aryl, R₃Is a hydrogen radical;

mixing polysilazane and p-dibutyl ether, stirring at a speed of 100 revolutions per minute to dissolve the polysilazane in the p-dibutyl ether to obtain a solution, adding fumed silica to the solution, and stirring at a speed of 1200 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 80% by mass of the coating composition, the p-dibutyl ether accounts for 18% by mass of the coating composition, and the fumed silica accounts for 2% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 30 μm, and the coated article was obtained.

Example 5

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, toluene, isophorone, alumina with particle size range of 2-4 micrometers, and silicon carbide with particle size range of 1-3 micrometers, wherein R of polysilazane₄Is an alkene, R₅Is an alkylsiloxane, R₆Is alkane, the polysilazane accounts for 20 percent of the mass of the preparation raw material, and the R of the polysiloxane is₇Is an alkane, R₈Is alkene, the polysiloxane accounts for 20 percent of the mass of the preparation raw material, the toluene accounts for 18 percent of the mass of the preparation raw material, and the isophorone accounts forThe mass percentage range of the preparation raw materials is 20%, the mass percentage range of the alumina in the preparation raw materials is 12%, and the mass percentage range of the silicon carbide in the preparation raw materials is 10%;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 200 revolutions per minute, carrying out copolymerization reaction on polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer, adding toluene and isophorone into the copolymer, then adding alumina and silicon carbide into the copolymer, stirring at the speed of 1200 revolutions per minute to obtain an initial product, and grinding the initial product to ensure that the particle size of the alumina and the silicon carbide is in the range of 0.2-0.3 micrometer, thereby obtaining a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 55 microns;

providing polysilazane, toluene and fumed silica, wherein R of the polysilazane₁Is siloxy, R₂Is an alkene, R₃Is a hydrogen radical;

mixing polysilazane and toluene, stirring at a speed of 600 revolutions per minute to dissolve the polysilazane in the toluene to obtain a solution, adding fumed silica into the solution, and stirring at a speed of 1200 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 70% by mass of the coating composition, the toluene accounts for 18% by mass of the coating composition, and the fumed silica accounts for 12% by mass of the coating composition;

the coating composition is coated on the surface of the primer layer to form a top coating with the thickness of 60 microns, and the coated piece is obtained.

Example 6

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, o-xylene, petroleum ether, alumina having a particle size range of 0.2 to 0.4 μm0.2-0.4 micron white carbon black and palladium acetate, wherein R of polysilazane₄Is hydrogen radical, R₅Is cycloalkane, R₆Is hydrogen radical, the polysilazane accounts for 15 percent of the mass of the preparation raw material, and the R of the polysiloxane₇Is alkylamino, R₈The catalyst is alkoxy, the polysiloxane accounts for 15% of the mass of the preparation raw material, the o-xylene accounts for 20% of the mass of the preparation raw material, the petroleum ether accounts for 20% of the mass of the preparation raw material, the alumina accounts for 11% of the mass of the preparation raw material, the white carbon black accounts for 15% of the mass of the preparation raw material, and the palladium acetate salt accounts for 4% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 220 r/min, adding palladium acetate salt to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding o-xylene and petroleum ether into the copolymer, then adding alumina and white carbon black into the copolymer, and stirring at the speed of 1500 r/min to obtain a primer composition;

polysilazanes, petroleum ethers and fumed silicas are provided, wherein R of the polysilazane is₁Is hydrogen radical, R₂Is hydrogen radical, R₃Is a hydrogen radical;

mixing polysilazane and petroleum ether, stirring at the speed of 450 revolutions per minute to dissolve the polysilazane in the petroleum ether to obtain a solution, adding fumed silica into the solution, and stirring at the speed of 1600 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 80% by mass of the coating composition, the petroleum ether accounts for 18% by mass of the coating composition, and the fumed silica accounts for 2% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 80 μm, and the coated article was obtained.

Example 7

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, n-hexane, acetone, attapulgite with the particle size range of 1-3 microns, white carbon black with the particle size range of 1-3 microns, magnesium oxide with the particle size range of 1-2 microns, and triethylene tetramine, wherein R of the polysilazane is₄Is alkylamino, R₅Is alkyl, R₆Is aryl, the polysilazane accounts for 12 percent of the mass of the preparation raw material, and the R of the polysiloxane₇Is an alkylsiloxane, R₈The silicone is cycloparaffin, the polysiloxane accounts for 11% of the mass percentage of the preparation raw material, the n-hexane accounts for 27% of the mass percentage of the preparation raw material, the acetone accounts for 27% of the mass percentage of the preparation raw material, the attapulgite accounts for 4% of the mass percentage of the preparation raw material, the white carbon black accounts for 4% of the mass percentage of the preparation raw material, the magnesium oxide accounts for 14% of the mass percentage of the preparation raw material, and the triethylene tetramine accounts for 1% of the mass percentage of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 320 revolutions per minute, adding triethylene tetramine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding n-hexane and acetone into the copolymer, adding attapulgite, magnesium oxide and white carbon black into the copolymer, stirring at the speed of 1700 revolutions per minute to obtain a primary product, and grinding the primary product to enable the particle size range of the attapulgite, magnesium oxide and white carbon black to be 0.2-0.3 micron to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 15 microns;

providing polysilazane, n-hexane, and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is alkyl, R₃Is a hydrogen radical;

mixing polysilazane and petroleum ether, stirring at the speed of 450 revolutions per minute to dissolve the polysilazane in n-hexane to obtain a solution, adding fumed silica into the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 70% by mass of the coating composition, the n-hexane accounts for 22% by mass of the coating composition, and the fumed silica accounts for 8% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 10 μm, and the coated article was obtained.

Example 8

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, methyl ethyl ketone, m-xylene, alumina with a particle size range of 1.3-3 micrometers, titanium oxide with a particle size range of 1.5-3 micrometers, bentonite with a particle size range of 1.2-2 micrometers, and triphenyl tin, wherein R of the polysilazane is₄Is aryl, R₅Is aryl, R₆Is hydrogen radical, the polysilazane accounts for 10 percent of the mass of the preparation raw material, and the R of the polysiloxane₇Is an alkene, R₈The organic silicon-based catalyst is hydrogen-based, the polysiloxane accounts for 10% of the mass percentage of the preparation raw material, the methyl ethyl ketone accounts for 20% of the mass percentage of the preparation raw material, the m-xylene accounts for 23% of the mass percentage of the preparation raw material, the aluminum oxide accounts for 30% of the mass percentage of the preparation raw material, the titanium oxide accounts for 3% of the mass percentage of the preparation raw material, the bentonite accounts for 3% of the mass percentage of the preparation raw material, and the triphenyl tin accounts for 3% of the mass percentage of the preparation raw materialThe circumference is 1%;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 280 revolutions per minute, adding triphenyl tin to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding methyl ethyl ketone and m-xylene into the copolymer, then adding aluminum oxide, titanium oxide and bentonite into the copolymer, stirring at the speed of 1300 revolutions per minute to obtain a primary product, and grinding the primary product to enable the particle size of the aluminum oxide, the titanium oxide and the bentonite to be 0.2-0.3 micron, thereby obtaining a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 75 microns;

providing polysilazane, methyl ethyl ketone and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is alkyl, R₃Is a hydrogen radical;

mixing polysilazane and petroleum ether, stirring at a speed of 450 revolutions per minute to dissolve the polysilazane in methyl ethyl ketone to obtain a solution, adding fumed silica to the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 60% by mass of the coating composition, the methyl ethyl ketone accounts for 25% by mass of the coating composition, and the fumed silica accounts for 15% by mass of the coating composition;

Example 9

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, diethyl ether, p-xylene, white carbon black with the particle size range of 1.3-3 microns, aluminum hydroxide with the particle size range of 1.5-3 microns, glass microspheres with the particle size range of 0.1-0.3 microns and N, N-dimethylaniline, wherein R of the polysilazane is₄Is an alkene, R₅Is aryl, R₆Is hydrogen radical, the polysilazane accounts for 6 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is an alkane, R₈The raw materials are alkane, the polysiloxane accounts for 4% of the mass percentage of the raw materials, the diethyl ether accounts for 35.5% of the mass percentage of the raw materials, the paraxylene accounts for 30% of the mass percentage of the raw materials, the white carbon black accounts for 10% of the mass percentage of the raw materials, the aluminum hydroxide accounts for 12% of the mass percentage of the raw materials, the glass microspheres account for 2% of the mass percentage of the raw materials, and the N, N-dimethylaniline accounts for 0.5% of the mass percentage of the raw materials;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at 480 r/min, adding N, N-dimethylaniline to perform copolymerization reaction between polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer, adding diethyl ether and p-xylene into the copolymer, adding white carbon black and aluminum hydroxide into the copolymer, stirring at 1300 r/min to obtain a primary product, grinding the primary product to make the particle size range of the white carbon black and the aluminum hydroxide be 0.2-0.3 micron, and adding glass microspheres to obtain a primer composition;

providing polysilazane, diethyl ether, and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is alkyl, R₃Is a hydrogen radical;

mixing polysilazane and diethyl ether, stirring at a speed of 450 revolutions per minute to dissolve the polysilazane in the diethyl ether to obtain a solution, adding fumed silica to the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 40% by mass of the coating composition, the diethyl ether accounts for 30% by mass of the coating composition, and the fumed silica accounts for 30% by mass of the coating composition;

Example 10

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, and triethylenediamine, wherein R of the polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 30 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is hydrogen radical, R₈The polysiloxane accounts for 50% of the mass of the preparation raw material, the dibutyl ether accounts for 15% of the mass of the preparation raw material, and the triethylene diamine accounts for 5% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 280 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, and stirring at the speed of 1500 revolutions per minute to obtain a primer composition;

providing polysilazane, dibutyl ether, and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is alkyl, R₃Is a hydrogen radical;

mixing polysilazane and dibutyl ether, stirring at a speed of 150 revolutions per minute to dissolve the polysilazane in dibutyl ether to obtain a solution, adding fumed silica to the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 30% by mass of the coating composition, the dibutyl ether accounts for 35% by mass of the coating composition, and the fumed silica accounts for 35% by mass of the coating composition;

Example 11

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, and triethylenediamine, wherein R of the polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 40 percent of the mass range of the preparation raw material, and the R of the polysiloxane₇Is hydrogen radical, R₈The polysiloxane accounts for 40% of the mass of the preparation raw material, the dibutyl ether accounts for 15% of the mass of the preparation raw material, and the triethylene diamine accounts for 5% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at a speed of 250 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, and stirring at a speed of 1100 revolutions per minute to obtain a primer composition;

mixing polysilazane and dibutyl ether, stirring at the speed of 150 revolutions per minute to dissolve the polysilazane in dibutyl ether to obtain a solution, adding fumed silica to the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 20% by mass of the coating composition, the dibutyl ether accounts for 42% by mass of the coating composition, and the fumed silica accounts for 38% by mass of the coating composition;

Example 12

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, and triethylenediamine, wherein R of the polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 50 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is hydrogen radical, R₈The polysiloxane accounts for 30% of the mass of the preparation raw material, the dibutyl ether accounts for 15% of the mass of the preparation raw material, and the triethylene diamine accounts for 5% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 300 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, and stirring at the speed of 1400 revolutions per minute to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 10 microns;

mixing polysilazane and dibutyl ether, stirring at the speed of 300 revolutions per minute to dissolve the polysilazane in dibutyl ether to obtain a solution, adding fumed silica to the solution, and performing ultrasonic dispersion until a transparent coating composition is obtained, wherein the polysilazane accounts for 10% by mass of the coating composition, the dibutyl ether accounts for 50% by mass of the coating composition, and the fumed silica accounts for 40% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 50 μm, and the coated article was obtained.

Example 13

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, silicon carbide with particle size range of 0.1-0.2 micron, and triethylenediamine, wherein R of polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 50 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is hydrogen radical, R₈The polysiloxane accounts for 30% of the mass of the preparation raw material, the dibutyl ether accounts for 10% of the mass of the preparation raw material, the silicon carbide accounts for 5% of the mass of the preparation raw material, and the triethylene diamine accounts for 5% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 500 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, then adding silicon carbide into the copolymer, and stirring at the speed of 1000 revolutions per minute to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 30 microns;

polysilazanes, dibutyl ethers, indian red and fumed silicasWherein R of the polysilazane₁Is alkyl fluoroether, R₂Is hydrogen radical, R₃Is aryl;

mixing polysilazane and dibutyl ether, stirring at the speed of 200 revolutions per minute to dissolve the polysilazane in the dibutyl ether to obtain a solution, adding fumed silica to the solution, ultrasonically dispersing, and coating composition, wherein the polysilazane accounts for 10% by mass of the coating composition, the dibutyl ether accounts for 70% by mass of the coating composition, the fumed silica accounts for 18% by mass of the coating composition, and the indian red accounts for 2% by mass of the coating composition;

Example 14

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, alumina with particle size range of 0.1-0.2 micron, and triethylenediamine, wherein R of polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 50 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is hydrogen radical, R₈The polysiloxane accounts for 30% of the mass of the preparation raw material, the dibutyl ether accounts for 10% of the mass of the preparation raw material, the alumina accounts for 7% of the mass of the preparation raw material, and the triethylene diamine accounts for 3% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 120 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, then adding alumina into the copolymer, and stirring at the speed of 1100 revolutions per minute to obtain a primer composition;

providing polysilazane, dibutyl ether, hanlan and fumed silica, wherein R of the polysilazane₁Is alkyl fluoroether, R₂Is hydrogen radical, R₃Is aryl;

mixing polysilazane and dibutyl ether, stirring at the speed of 200 revolutions per minute to dissolve the polysilazane in the dibutyl ether to obtain a solution, adding fumed silica and han blue into the solution, and performing ultrasonic dispersion to obtain the coating composition, wherein the polysilazane accounts for 10% by mass of the coating composition, the dibutyl ether accounts for 80% by mass of the coating composition, the fumed silica accounts for 8% by mass of the coating composition, and the han blue accounts for 2% by mass of the coating composition;

Example 15

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, dibutyl ether, silicon carbide with the particle size range of 1-3 microns, and dimethyl tin, wherein R of the polysilazane is₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 50 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is hydrogen radical, R₈The silicon carbide is alkene, the polysiloxane accounts for 30% of the mass of the preparation raw material, the dibutyl ether accounts for 10% of the mass of the preparation raw material, the silicon carbide accounts for 7% of the mass of the preparation raw material, and the dimethyl tin accounts for 3% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 420 revolutions per minute, adding dimethyl tin to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding dibutyl ether into the copolymer, then adding silicon carbide into the copolymer, stirring at the speed of 1000 revolutions per minute to obtain an initial product, and grinding the initial product to enable the particle size range of the silicon carbide to be reduced to 0.2-0.3 micrometer, thereby obtaining a primer composition;

providing polysilazane, dibutyl ether, and fumed silica, wherein R of the polysilazane₁Is arylalkene, R₂Is arylalkene, R₃Is fluoroalkyl;

mixing polysilazane and dibutyl ether, stirring at the speed of 300 revolutions per minute to dissolve the polysilazane in the dibutyl ether to obtain a solution, adding fumed silica to the solution, and stirring at the speed of 1500 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 60% by mass of the coating composition, the dibutyl ether accounts for 20% by mass of the coating composition, and the fumed silica accounts for 20% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 25 μm, and the coated article was obtained.

Example 16

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, p-xylene, silicon carbide with a particle size range of 1-3 microns, and triethylenediamine, wherein R of the polysilazane₄Is hydrogen radical, R₅Is hydrogen radical, R₆Is hydrogen radical, the polysilazane accounts for 20 percent of the mass of the preparation raw material, and the polysiloxaneR₇Is hydrogen radical, R₈The polysiloxane accounts for 15% of the mass of the preparation raw material, the paraxylene accounts for 4% of the mass of the preparation raw material, the silicon carbide accounts for 60% of the mass of the preparation raw material, and the triethylenediamine accounts for 1% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 510 revolutions per minute, adding triethylenediamine to enable polysiloxane and polysilazane to generate copolymerization reaction to generate polysiloxane-polysilazane copolymer, adding p-xylene into the copolymer, then adding silicon carbide into the copolymer, stirring at the speed of 1100 revolutions per minute to obtain an initial product, and grinding the initial product to enable the particle size range of the silicon carbide to be reduced to 0.21-0.33 micrometer, thereby obtaining a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 26 microns;

providing polysilazane, paraxylene, and fumed silica, wherein R of the polysilazane₁Is fluoroalkyl, R₂Is alkoxy, R₃Is alkyl fluoroether;

mixing polysilazane and dibutyl ether, stirring at a speed of 350 revolutions per minute to dissolve the polysilazane in the dibutyl ether to obtain a solution, adding fumed silica to the solution, and stirring at a speed of 1000 revolutions per minute until a transparent coating composition is obtained, wherein the polysilazane accounts for 60% by mass of the coating composition, the paraxylene accounts for 20% by mass of the coating composition, and the fumed silica accounts for 20% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 35 μm, and the coated article was obtained.

Example 17

The preparation method of the coated piece comprises the following steps:

providing a substrate;

providing a preparation raw material of the primer layer, wherein the preparation raw material comprises: polysilazane, polysiloxane, p-xylene, and silicon carbide with particle size ranging from 0.2 to 0.3 micron, wherein R of the polysilazane₄Is hydrogen radical, R₅Is an alkane, R₆Is hydrogen radical, the polysilazane accounts for 25 percent of the mass of the preparation raw material, and the polysiloxane has R₇Is alkylamino, R₈The polysiloxane accounts for 25% of the mass of the preparation raw material, the paraxylene accounts for 20% of the mass of the preparation raw material, and the silicon carbide accounts for 30% of the mass of the preparation raw material;

placing polysilazane and polysiloxane in a reactor, mixing polysilazane and polysiloxane at the speed of 560 revolutions per minute, carrying out copolymerization reaction on polysiloxane and polysilazane to generate polysiloxane-polysilazane copolymer, adding paraxylene into the copolymer, then adding silicon carbide into the copolymer, and stirring at the speed of 1100 revolutions per minute to obtain a primer composition;

coating the primer composition on the surface of a substrate to form a primer layer with the thickness of 2 microns;

providing polysilazane, paraxylene, and fumed silica, wherein R of the polysilazane₁Is fluoroalkyl, R₂Is fluoroalkyl, R₃Is fluoroalkyl;

mixing polysilazane and paraxylene, stirring at the speed of 200 revolutions per minute to dissolve polysilazane in paraxylene to obtain a solution, adding fumed silica to the solution, and stirring at the speed of 1100 revolutions per minute until a transparent coating composition is obtained, wherein polysilazane accounts for 60% by mass of the coating composition, paraxylene accounts for 20% by mass of the coating composition, and fumed silica accounts for 20% by mass of the coating composition;

the coating composition was applied to the surface of the primer layer to form a top coat layer having a thickness of 5 μm, and the coated article was obtained.

The coated articles of examples 1-17 were tested for hardness, adhesion temperature resistance, and water contact angle, and the results are shown in Table 1.

TABLE 1 results of physical Properties test of coated articles of examples 1-17

	Hardness (H)	Attachment of	Temperature resistance (weight loss%)	Water contact Angle (°)
					Example 1	9	0	1.73	121
Example 2	9	0	1.32	120
					Example 3	9	0	1.36	119
Example 4	9	0	1.44	118
					Example 5	9	0	1.56	118
Example 6	9	0	2.02	117
					Example 7	8	0	2.05	117
Example 8	8	0	2.31	115
					Example 9	8	0	1.86	116
Example 10	8	0	1.09	115
					Example 11	7	0	1.79	115
Example 12	7	0	1.07	116
					Example 13	7	0	1.06	116
Example 14	9	0	1.08	117
					Example 15	9	0	1.15	123
Example 16	9	0	1.15	125
					Example 17	8	0	1.14	123

The hardness of the coated articles of examples 1-17 was tested according to GB/T6739-1796 (film hardness test method), which shows that the hardness of the coated articles of examples 1-17 is in the range of 6-9H, indicating that the coated articles of examples 1-17 all have better hardness.

The adhesion of the coated articles of examples 1-17 was tested according to GB/T9286 (adhesion test method), which shows that the hundred cell adhesion of the coated articles of examples 1-17 can reach a level of 0, indicating that the adhesion of the coated articles of examples 1-17 is also better.

The weight loss of the coated articles of examples 1-17 was tested according to GB/T9286 (temperature resistance test) and showed that the temperature resistance of the coated articles of examples 1-17 was also better.

The coated articles of examples 1-17 were tested for water contact angle using topographical image analysis, and the coated articles of examples 1-17 had water contact angles greater than 90 °, indicating that the coated articles of examples 1-17 all had the advantage of being easily cleaned.

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 coated part is characterized by comprising a substrate and a top coating formed on the surface of the substrate, wherein the top coating contains a coating composition, the coating composition contains polysilazane and fumed silica, and the fumed silica accounts for 2-30% of the coating composition by mass; the polysilazane in the coating composition accounts for 10-80% of the coating composition by mass; the chemical structure of the polysilazane is as follows:

，

wherein R is₁、R₂And R₃At least one of the three is a low surface energy group that is a hydrogen group, a siloxy group, an alkylsiloxy group, a fluoroalkyl group, or an alkyl fluoroether;

the coating piece also comprises a primer layer formed between the substrate and the surface coating, the raw materials for preparing the primer layer comprise polysilazane, polysiloxane and a catalyst, and the polysilazane and the polysiloxane are subjected to copolymerization reaction to generate a polysilazane-polysiloxane copolymer;

the polysilazane in the raw material for preparing the primer layer has the structural formula:

，

wherein R is₄Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R₅Is hydrogen radical, alkane, alkene, aryl, alkoxy, alkyl siloxy or alkylamino radical, R₆Is hydrogen, alkane, alkene, aryl, alkoxy, alkyl siloxane, or alkyl amine;

the polysiloxane has the structural formula:

，

wherein R is₇Is hydrogen radical, alkane, alkene, aryl, alkoxy or alkyl siloxy, R₈Is hydrogen, alkane, alkene, aryl, alkoxy or alkyl siloxy;

the polysilazane accounts for 10-80% of the mass of the preparation raw material, and the polysiloxane accounts for 30-50% of the mass of the preparation raw material; the polysiloxane and the polysilazane account for 10-80% of the preparation raw materials by mass;

the catalyst accounts for 2-3% of the mass of the preparation raw material, and is a metal catalyst; the metal catalyst can be an organic tin catalyst and/or a palladium 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.

2. The applicator of claim 1, wherein the topcoat has a thickness in the range of 0.01 microns to 100 microns.

3. The coated article of claim 2, wherein the primer layer has a thickness in a range from 0.01 micrometers to 100 micrometers.

4. The coated article of claim 3, wherein R is₄And R₅At least one of which is a hydrogen radical or an alkene.

5. The coated article according to claim 1, wherein the polysilazane in the starting material has a molecular weight of 100 to 1000.

6. The coated article of claim 1 wherein the polysiloxane has a molecular weight of 100 to 1300.

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

8. The coated member according to claim 1, wherein the raw material further comprises a filler, the filler accounts for 1-50% of the raw material by mass, and 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.

9. The coated member according to claim 7, wherein the preparation raw material further comprises a filler, and the filler accounts for 1 to 50% of the preparation raw material by mass.

10. The coated article of claim 1, wherein R is₁、R₂And R₃Any one or two of the three are alkyl, aryl, alkene, alkoxy, or cycloalkyl.

11. The coated article according to claim 1, wherein the coating composition further comprises a solvent, and the solvent is 10 to 80% by mass of the coating composition.

12. The coating member according to claim 11, wherein the solvent is at least one selected from the group consisting of an alkane-based solvent, an ether-based solvent, a ketone-based solvent, and a benzene derivative-based solvent.

13. The coating element of claim 12 wherein the alkane solvent is selected from at least one or more of n-hexane, n-octane, n-decane, chloroform, methylene chloride, ethylene dichloride, 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.

14. A method of preparing a coated article according to any one of claims 1 to 13, comprising the steps of:

providing a substrate and a coating composition;

coating the coating composition on the surface of a substrate to form a top coating on the surface of the substrate to obtain a coated piece;

the preparation method also comprises the following steps:

15. A domestic appliance, characterized in that it comprises a coating element according to any one of claims 1 to 13.