Organic silicon coating as well as preparation method and application thereof

Abstract

The invention provides an organic silicon coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The organic silicon coating comprises a prime coating and a topcoat coating, the topcoat paint comprises the following preparation raw materials: a first composition and a second composition, the prime coating comprises the following preparation raw materials: a second composition; the first composition comprises the following preparation raw materials: a first organic silicon precursor, a second organic silicon precursor and a first solvent; the second composition is prepared from the following raw materials: SiX4, a second solvent and a catalyst. Three organic silicon compounds with specific structures are adopted, a coating system with good temperature resistance, hydrophobicity, adhesiveness, impact resistance and the like is formed through specific reaction of the three organic silicon compounds, and a coating which is resistant to high temperature, easy to clean and good in mechanical performance can be obtained through the coating system. The protective film is used for protecting kitchen appliances, especially ovens, and can well meet the requirements of high-temperature and heavy-oil-stain environments of kitchens.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a silicone coating, a preparation method thereof, and an application thereof. Background Art

[0002] The kitchen is an important area in home life and is also the place where oil stains are most likely to accumulate. Kitchen appliances such as ovens, cooktops, and range hoods are in a high-temperature and heavy-oil stain environment for a long time. The surface is prone to dirt and difficult to clean, resulting in poor user experience. The commonly used easy-to-clean Teflon coating on the market has good easy-to-clean performance, but the use temperature needs to be limited below 260°C, which is not applicable to high-temperature kitchen products such as ovens with a long-term working temperature of 200 - 500°C. At present, the oven cavity is usually made of stainless steel and enamel coating. The surface of stainless steel is prone to oxidation and yellowing, and the enamel coating is formed by high-temperature melting of inorganic powder, and the coating is prone to chipping. Neither of these two has an easy-to-clean effect, so that the oil stains generated by food materials during the frying and baking process are more likely to remain on the inner wall and the surface of the drip pan. In view of this, there is an urgent need for a coating technology with excellent easy-to-clean effect at 200 - 500°C.

[0003] In recent years, a new type of easy-to-clean ceramic coating has emerged. This coating is used for the oven cavity and has excellent easy-to-clean effect, but it does not mention whether the coating cracks, peels off, has long-term non-stickiness, and high-temperature resistance. The current easy-to-clean coatings are difficult to meet the requirements of the high-temperature and heavy-oil stain environment in the kitchen. Summary of the Invention

[0004] The present invention aims to solve one of the above technical problems existing in the prior art. For this reason, one of the purposes of the present invention is to provide a silicone coating. The coating prepared by using this coating is applicable to high temperatures of 200 - 500°C, has high temperature resistance and is easy to clean, and can meet the requirements of the high-temperature and heavy-oil stain environment in the kitchen.

[0005] The second purpose of the present invention is to provide a preparation method of the above silicone coating.

[0006] The third purpose of the present invention is to provide a silicone coating prepared from the above silicone coating.

[0007] The fourth purpose of the present invention is to provide a preparation method of the above silicone coating.

[0008] The fifth purpose of the present invention is to provide a kitchen appliance including the above silicone coating.

[0009] In order to achieve the above purposes, the technical solutions adopted by the present invention are as follows:

[0010] The first aspect of the present invention provides a silicone coating, including a primer coating and a topcoat.

[0011] The topcoat paint comprises the following preparation raw materials: a first composition and a second composition;

[0012] The primer paint comprises the following preparation raw materials: a second composition;

[0013] The first composition comprises the following preparation raw materials: a first silicone precursor, a second silicone precursor, and a first solvent;

[0014] The second composition comprises the following preparation raw materials: SiX 4 , a second solvent, and a catalyst;

[0015] The first silicone precursor comprises at least one of RSiX 3 , R 2 SiX 2 , R 3 SiX or R 3 SiX'SiR 3 ; the second silicone precursor comprises at least one of YSiX 3 , Y 2 SiX 2 , Y 3 SiX or SiY 4 ;

[0016] Wherein, each X is independently selected from -OR or halogen; each X' is independently selected from -O- or -NR-; each Y is independently selected from a C6-10 aryl group or a C8-30 alkyl group; each R is independently selected from H or a C1-C7 alkyl group.

[0017] The silicone paint according to the first aspect of the present invention has at least the following beneficial effects:

[0018] In the second composition of the paint of the present invention, SiX 4 will form an inorganic network structure under the action of the second solvent and the catalyst. The first silicone precursor and the second silicone precursor in the first composition are hydrolyzed in the first solvent to generate a first hydrolysis product and a second hydrolysis product respectively. After mixing the first composition and the second composition, the first hydrolysis product reacts with the inorganic network structure in the second composition, which can effectively reduce the surface energy of the system and achieve the effect of easy cleaning of the coating surface; the second hydrolysis product reacts with the inorganic network structure in the second composition, which can introduce heat-stable groups such as aryl groups and long-chain alkyl groups into the system and improve the temperature resistance of the coating. Thus, the obtained topcoat paint has excellent easy-cleaning effect and temperature resistance. Furthermore, using the inorganic network structure formed by the above second composition as the primer paint can further improve the temperature resistance, adhesion, impact resistance and other mechanical properties of the coating.

[0019] In some specific embodiments of the present invention, each Y is independently selected from phenyl, tolyl, ethylphenyl or C10-20 alkyl.

[0020] In some specific embodiments of the present invention, each R is independently selected from H, methyl, ethyl or propyl.

[0021] In some specific embodiments of the present invention, the first organosilicon precursor includes at least one of trimethoxysilane, triethoxysilane, tripropoxysilane, methyltrichlorosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, dimethyldimethoxysilane, diethyldiethoxysilane, dipropyldipropoxysilane, trimethylmethoxysilane, triethylethoxysilane, tripropylpropoxysilane, dimethylethylchlorosilane, diethylmethylchlorosilane, trimethylfluorosilane, trimethylbromosilane, trimethyliodosilane, hexamethyldisiloxane or hexamethyldisilazane.

[0022] In some specific embodiments of the present invention, the second organosilicon precursor includes at least one of phenyltrimethoxysilane, phenyltriethoxysilane, phenyltripropoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, dimethyldiphenyldimethoxysilane, triphenylmethoxysilane, tetraphenylsilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, dodecyldimethylmethoxysilane or dodecyltrimethylsilane.

[0023] In some specific embodiments of the present invention, the SiX 4 includes at least one of tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane or trimethoxychlorosilane.

[0024] In some specific embodiments of the present invention, the catalyst includes at least one of hydrochloric acid, sulfuric acid, nitric acid, ammonia water, sodium hydroxide, acetic acid or formic acid.

[0025] In some specific embodiments of the present invention, the first solvent and the second solvent independently include an organic solvent and water.

[0026] In some specific embodiments of the present invention, the mass ratio of the primer coating to the topcoat is 1:(0.5-1.5).

[0027] In some specific embodiments of the present invention, in the first composition, the mass percentage of the first organosilicon precursor is 10-50%.

[0028] In some specific embodiments of the present invention, in the first composition, the mass percentage of the second organosilicon precursor is 1-40%.

[0029] In some specific embodiments of the present invention, in the first composition, the mass percentage of the first solvent is 10-85%.

[0030] In some specific embodiments of the present invention, in the first composition, the mass ratio of the first organosilicon precursor to the second organosilicon precursor is 1:(0.1-0.9).

[0031] In some specific embodiments of the present invention, in the second composition, the mass percentage of SiX 4 is 1-60%.

[0032] In some specific embodiments of the present invention, in the second composition, the mass percentage of the second solvent is 35-90%.

[0033] In some specific embodiments of the present invention, in the second composition, the mass percentage of the catalyst is 0.005-15%.

[0034] In some specific embodiments of the present invention, in the topcoat paint, the mass ratio of the first composition to the second composition is (0.1-2):1.

[0035] The second aspect of the present invention provides a preparation method of the organosilicon paint described in the first aspect of the present invention, comprising the following steps: mixing the first organosilicon precursor, the second organosilicon precursor, and the first solvent to carry out a first reaction to obtain the first composition; mixing the SiX 4 , the second solvent, and the catalyst to carry out a second reaction to obtain the second composition; mixing the first composition and the second composition to carry out a third reaction to obtain the topcoat paint; using the second composition as the primer paint.

[0036] According to the preparation method of the organosilicon paint described in the second aspect of the present invention, it has at least the following beneficial effects:

[0037] By using the preparation method of the present invention, the first organosilicon precursor and the second organosilicon precursor can first react with the first solvent to generate a product with a specific structural composition, and then further react with the inorganic network structure generated by the reaction of SiX 4 in the second composition to obtain a coating system with low surface energy and good heat resistance.

[0038] In some specific embodiments of the present invention, the temperature of the second reaction is 20-120°C.

[0039] In some specific embodiments of the present invention, the time of the second reaction is 5-20 h.

[0040] In some specific embodiments of the present invention, the temperature of the third reaction is 20-120°C.

[0041] In some specific embodiments of the present invention, the time of the third reaction is 2 to 15 h.

[0042] The third aspect of the present invention provides a silicone coating, comprising a primer coating and a topcoat. The primer coating is formed from the primer paint in the silicone paint described in the first aspect of the present invention, and the topcoat is formed from the topcoat paint in the silicone paint described in the first aspect of the present invention.

[0043] The silicone coating according to the third aspect of the present invention has at least the following beneficial effects:

[0044] The silicone coating provided by the present invention has a primer coating and a topcoat. The primer coating is formed from the primer paint in the silicone paint described in the first aspect, and the topcoat is formed from the topcoat paint in the silicone paint described in the first aspect. The primer coating provides good mechanical properties such as adhesion and impact resistance, and can improve the temperature resistance of the coating. The topcoat provides good temperature resistance and easy-cleaning performance.

[0045] In some embodiments of the present invention, the thickness of the primer coating is 1 to 10 μm.

[0046] In some embodiments of the present invention, the thickness of the topcoat is 0.5 to 5 μm.

[0047] In some embodiments of the present invention, the water contact angle of the silicone coating is 103 to 110°.

[0048] In some embodiments of the present invention, the oil contact angle of the silicone coating is 41 to 60°.

[0049] In some embodiments of the present invention, the adhesion grade of the silicone coating is grade 0.

[0050] The fourth aspect of the present invention provides a method for preparing the silicone coating described in the third aspect of the present invention, comprising the following steps: sequentially coating the primer paint and the topcoat paint on a substrate, and curing to obtain the silicone coating.

[0051] The method for preparing the silicone coating according to the fourth aspect of the present invention has at least the following beneficial effects:

[0052] The method for preparing the silicone coating of the present invention is simple and convenient to operate. By using the method for preparing the silicone coating of the present invention, a silicone coating with temperature resistance and easy cleaning can be obtained.

[0053] In some specific embodiments of the present invention, the curing temperature is 50 to 220 °C.

[0054] In some specific embodiments of the present invention, the curing time is 10 to 80 minutes.

[0055] The fifth aspect of the present invention provides a kitchen appliance, including the silicone coating described in the third aspect of the present invention.

[0056] The kitchen appliance according to the fifth aspect of the present invention has at least the following beneficial effects: The kitchen appliance provided by the present invention includes a silicone coating, which has good high-temperature resistance, easy cleaning and mechanical properties, and can well meet the requirements of the high-temperature and heavy oil pollution environment in the kitchen. Therefore, the kitchen appliance provided with this silicone coating also has good temperature resistance and easy cleaning properties, and the mechanical properties such as the adhesion and impact resistance of the coating are good.

[0057] In some specific embodiments of the present invention, the kitchen appliance includes at least one of an oven, a cooking stove or a range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is the test process of the easy cleaning performance of the coating in Application Example 1.

[0059] Figure 2 is the test process of the mechanical impact resistance of the coating in Application Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] The content of the present invention will be further described in detail below through examples. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles described in the present invention all fall within the protection scope of the present invention. The specific process parameters and the like in the following examples are also only an example within a suitable range, that is, those skilled in the art can make selections within a suitable range through the description in this article, rather than being limited to the specific data in the following examples. The raw materials, reagents or devices used in the following examples and comparative examples can be obtained from conventional commercial channels or can be obtained by existing known methods without special instructions.

[0061] The first aspect of the embodiment of the present invention provides a silicone coating, including a primer coating and a topcoat;

[0062] The topcoat includes the following preparation raw materials: a first composition, a second composition;

[0063] The primer coating includes the following preparation raw materials: a second composition;

[0064] The first composition includes the following preparation raw materials: a first silicone precursor, a second silicone precursor, a first solvent;

[0065] The second composition comprises the following raw materials for preparation: SiX 4 , a second solvent, and a catalyst;

[0066] The first organosilicon precursor comprises at least one of RSiX 3 , R 2 SiX 2 , R 3 SiX or R 3 SiX'SiR 3 ; the second organosilicon precursor comprises at least one of YSiX 3 , Y 2 SiX 2 , Y 3 SiX or SiY 4 ;

[0067] Wherein, each X is independently selected from -OR or halogen; each X' is independently selected from -O- or -NR-; each Y is independently selected from C6-10 aryl or C8-30 alkyl; each R is independently selected from H or C1-C7 alkyl.

[0068] In the second composition of the coating of the present invention, SiX 4 will form an inorganic network structure under the action of the second solvent and the catalyst. The first organosilicon precursor and the second organosilicon precursor in the first composition are hydrolyzed in the first solvent to generate a first hydrolysis product and a second hydrolysis product respectively. After mixing the first composition and the second composition, the product formed by the reaction of the first hydrolysis product reacts with the inorganic network structure in the second composition, which can effectively reduce the surface energy of the system and achieve the effect of easy cleaning of the coating surface; the product formed by the reaction of the second organosilicon precursor with the second hydrolysis product in the first solvent reacts with the inorganic network structure in the second composition, which can introduce heat-stable groups such as aryl and long-chain alkyl groups into the system and improve the temperature resistance of the coating. Thus, the topcoat coating obtained has excellent easy-cleaning effect and temperature resistance. Furthermore, using the inorganic network structure formed by the above second composition as the primer coating can further improve the temperature resistance and mechanical properties such as adhesion and impact resistance of the coating.

[0069] In some embodiments of the present invention, the halogen comprises at least one of fluorine, chlorine, bromine or iodine; in some specific embodiments of the present invention, the halogen is selected from chlorine.

[0070] In some embodiments of the present invention, each Y is independently selected from phenyl, tolyl, ethylphenyl or C10-20 alkyl; in some specific embodiments of the present invention, each Y is independently selected from phenyl or C10-20 alkyl; in some examples of the present invention, each Y is independently selected from phenyl or C12-16 alkyl. In some specific examples of the present invention, each Y is independently selected from phenyl, dodecyl, tridecyl, tetradecyl, pentadecyl or hexadecyl.

[0071] In some embodiments of the present invention, each R is independently selected from H, methyl, ethyl or propyl; in some specific embodiments of the present invention, each R is independently selected from H, methyl or ethyl.

[0072] In some embodiments of the present invention, each X is independently selected from -OCH 3 -, -OC 2 H 5 -, -OC 3 H 7 or -Cl; in some specific embodiments of the present invention, each X is independently selected from -OCH 3 -, -OC 2 H 5 or -Cl.

[0073] In some embodiments of the present invention, each X' is independently selected from -O-, -NH-, -NCH 3 -, -NC 2 H 5 - or -NC 3 H 7 -; in some specific embodiments of the present invention, in the silicone coating, each X' is independently selected from -O- or -NH-.

[0074] In some embodiments of the present invention, the first silicone precursor includes at least one of trimethoxysilane, triethoxysilane, tripropoxysilane, methyltrichlorosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, dimethyldimethoxysilane, diethyldiethoxysilane, dipropyldipropoxysilane, trimethylmethoxysilane, triethylethoxysilane, tripropylpropoxysilane, dimethylethylchlorosilane, diethymethylchlorosilane, trimethylfluorosilane, trimethylbromosilane, trimethyliodosilane, hexamethyldisiloxane or hexamethyldisilazane; in some specific embodiments of the present invention, the first silicone precursor includes at least one of methyltrimethoxysilane, methyltriethoxysilane, methyltrichlorosilane, dimethyldimethoxysilane, dimethylethylchlorosilane, hexamethyldisiloxane or hexamethyldisilazane.

[0075] In some embodiments of the present invention, the second organosilicon precursor includes at least one of phenyltrimethoxysilane, phenyltriethoxysilane, phenyltripropoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, xylyldimethoxysilane, triphenylmethoxysilane, tetraphenylsilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, dodecyldimethylmethoxysilane or dodecyltrimethylsilane; in some specific embodiments of the present invention, the second organosilicon precursor includes at least one of phenyltrimethoxysilane, diphenyldimethoxysilane, dodecyltrimethoxysilane or hexadecyltrimethoxysilane.

[0076] In some embodiments of the present invention, SiX 4 includes at least one of tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane or trimethoxychlorosilane; in some specific embodiments of the present invention, SiX 4 is selected from tetraethoxysilane.

[0077] In some embodiments of the present invention, the catalyst includes at least one of hydrochloric acid, sulfuric acid, nitric acid, ammonia water, sodium hydroxide, acetic acid or formic acid. A suitable catalyst can be selected according to the specific organosilicon compound raw materials for the purpose of promoting its hydrolysis, and no specific limitation is made in the embodiments of the present invention.

[0078] In some embodiments of the present invention, the first solvent includes an organic solvent and water.

[0079] In some embodiments of the present invention, the mass percentage of the organic solvent in the first solvent is 40-80%; in some specific embodiments of the present invention, the mass percentage of the organic solvent in the first solvent is 45-75%; in some examples of the present invention, the mass percentage of the organic solvent in the first solvent is 50-70%. In some specific examples of the present invention, the mass percentage of the organic solvent in the first solvent is selected from 52%, 55%, 58%, 60%, 62%, 65% or 68%.

[0080] In some embodiments of the present invention, in the first solvent, the organic solvent includes at least one of an alcohol solvent, an ether solvent or an ester solvent.

[0081] In some embodiments of the present invention, among the organic solvents of the first solvent, the alcohol solvents include at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol or tert-butanol; the ether solvents include at least one of methyl ether, ethyl ether, propyl ether, isopropyl ether, methyl propyl ether, methyl n-butyl ether or butyl ether; the ester solvents include at least one of methyl formate, ethyl formate, propyl formate, isopropyl formate, butyl formate, isobutyl formate, amyl formate or isoamyl formate; in some specific embodiments of the present invention, among the organic solvents of the first solvent, the alcohol solvents include at least one of methanol, ethanol, propanol or isopropanol; the ether solvents include at least one of methyl ether, ethyl ether, propyl ether or isopropyl ether; the ester solvents include at least one of methyl formate, ethyl formate, propyl formate or isopropyl formate.

[0082] In some embodiments of the present invention, the organic solvent in the first solvent is selected from alcohol solvents; in some specific embodiments of the present invention, the organic solvent in the first solvent includes at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol or tert-butanol; in some examples of the present invention, the organic solvent in the first solvent includes at least one of methanol, ethanol, propanol or isopropanol. In some specific examples of the present invention, the organic solvent in the first solvent is selected from methanol, ethanol, propanol or isopropanol.

[0083] In some embodiments of the present invention, the second solvent includes an organic solvent and water.

[0084] In some embodiments of the present invention, the mass percentage of the organic solvent in the second solvent is 40-80%; in some specific embodiments of the present invention, the mass percentage of the organic solvent in the second solvent is 45-75%; in some examples of the present invention, the mass percentage of the organic solvent in the second solvent is 50-70%. In some specific examples of the present invention, the mass percentage of the organic solvent in the second solvent is selected from 52%, 55%, 58%, 60%, 62%, 65% or 68%.

[0085] In some embodiments of the present invention, in the second solvent, the organic solvent includes at least one of alcohol solvents, ether solvents or ester solvents.

[0086] In some embodiments of the present invention, among the organic solvents of the second solvent, the alcohol solvents include at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol or tert-butanol; the ether solvents include at least one of methyl ether, ethyl ether, propyl ether, isopropyl ether, methyl propyl ether, methyl n-butyl ether or butyl ether; the ester solvents include at least one of methyl formate, ethyl formate, propyl formate, isopropyl formate, butyl formate, isobutyl formate, amyl formate or isoamyl formate; in some specific embodiments of the present invention, among the organic solvents of the second solvent, the alcohol solvents include at least one of methanol, ethanol, propanol or isopropanol; the ether solvents include at least one of methyl ether, ethyl ether, propyl ether or isopropyl ether; the ester solvents include at least one of methyl formate, ethyl formate, propyl formate or isopropyl formate.

[0087] In some embodiments of the present invention, the organic solvent in the second solvent is selected from alcohol solvents; in some specific embodiments of the present invention, the organic solvent in the second solvent includes at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol or tert-butanol; in some examples of the present invention, the organic solvent in the second solvent includes at least one of methanol, ethanol, propanol or isopropanol. In some specific examples of the present invention, the organic solvent in the second solvent is selected from methanol, ethanol, propanol or isopropanol.

[0088] It can be understood that the first solvent and the second solvent are independent of each other, and the same or different types and compositions can be independently selected during the specific implementation process.

[0089] In some embodiments of the present invention, the mass ratio of the primer coating to the topcoat is 1:(0.5 - 1.5); in some specific embodiments of the present invention, the mass ratio of the primer coating to the topcoat is 1:(0.8 - 1.2); in some examples of the present invention, the mass ratio of the primer coating to the topcoat is 1:0.8, 1:0.9, 1:1, 1:1.1 or 1:1.2.

[0090] In some embodiments of the present invention, the mass percentage of the first organosilicon precursor in the first composition is 10 - 50%; in some specific embodiments of the present invention, the mass percentage of the first organosilicon precursor in the first composition is 13 - 49%; in some examples of the present invention, the mass percentage of the first organosilicon precursor in the first composition is 17 - 48%. In some specific examples of the present invention, the mass percentage of the organosilicon precursor in the first composition is 17%, 19%, 20%, 25%, 28%, 30%, 35%, 38%, 40%, 45% or 48%.

[0091] In some embodiments of the present invention, the mass percentage of the second silicone precursor in the first composition is 1-40%; in some specific embodiments of the present invention, the mass percentage of the second silicone precursor in the first composition is 8-36%; in some examples of the present invention, the mass percentage of the second silicone precursor in the first composition is 13-32%. In some specific examples of the present invention, in the first composition, the mass percentage of the second silicone precursor in the first composition is 13%, 15%, 16%, 18%, 20%, 22%, 25%, 27%, 30% or 32%.

[0092] In some embodiments of the present invention, the mass percentage of the first solvent in the first composition is 10-90%; in some specific embodiments of the present invention, the mass percentage of the first solvent in the first composition is 15-80%; in some examples of the present invention, the mass percentage of the first solvent in the first composition is 20-70%. In some specific examples of the present invention, the mass percentage of the first solvent in the first composition is 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or 70%.

[0093] In some embodiments of the present invention, the mass ratio of the first silicone precursor to the second silicone precursor is 1:(0.1-0.9); in some specific embodiments of the present invention, the mass ratio of the first silicone precursor to the second silicone precursor is 1:(0.3-0.9); in some examples of the present invention, the mass ratio of the first silicone precursor to the second silicone precursor is 1:(0.4-0.8). In some specific examples of the present invention, the mass ratio of the first silicone precursor to the second silicone precursor is 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75 or 1:0.8.

[0094] In some embodiments of the present invention, the first composition comprises the following raw materials for preparation in mass percentage: 10-50% first silicone precursor, 1-40% second silicone precursor, 10-90% first solvent; in some specific embodiments of the present invention, the first composition comprises the following raw materials for preparation in mass percentage: 13-49% first silicone precursor, 8-36% second silicone precursor, 15-80% first solvent; in some examples of the present invention, the first composition comprises the following raw materials for preparation in mass percentage: 17-48% first silicone precursor, 13-32% second silicone precursor, 20-70% first solvent.

[0095] In some embodiments of the present invention, SiX 4The mass percentage in the second composition is 1 to 60%; in some specific embodiments of the present invention, SiX 4 The mass percentage in the second composition is 3 to 58%; in some examples of the present invention, SiX 4 The mass percentage in the second composition is 4 to 56%. In some specific examples of the present invention, SiX 4 The mass percentage in the second composition is 4%, 8%, 10%, 15%, 20%, 25%, 30%, 36%, 40%, 45%, 50% or 56%.

[0096] In some embodiments of the present invention, the mass percentage of the second solvent in the second composition is 35 to 90%; in some specific embodiments of the present invention, the mass percentage of the second solvent in the second composition is 38 to 88%; in some examples of the present invention, the mass percentage of the second solvent in the second composition is 40 to 86%. In some specific examples of the present invention, the mass percentage of the second solvent in the second composition is 40%, 43.95%, 45%, 50%, 55%, 60%, 63%, 70%, 75%, 80%, 82% or 86%.

[0097] In some embodiments of the present invention, the mass percentage of the catalyst in the second composition is 0.005 to 15%; in some specific embodiments of the present invention, the mass percentage of the catalyst in the second composition is 0.008 to 12%; in some examples of the present invention, the mass percentage of the catalyst in the second composition is 0.01 to 10%. In some specific examples of the present invention, the mass percentage of the catalyst in the second composition is 0.01%, 0.05%, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 6%, 8% or 10%.

[0098] In some embodiments of the present invention, the second composition comprises the following mass percentages of preparation raw materials: 1 to 60% SiX 4 、35 to 90% second solvent, 0.005 to 15% catalyst; in some specific embodiments of the present invention, the second composition comprises the following mass percentages of preparation raw materials: 3 to 58% SiX 4 、38 to 88% second solvent, 0.008 to 12% catalyst; in some examples of the present invention, the second composition comprises the following mass percentages of preparation raw materials: 4 to 56% SiX 4 、40 to 86% second solvent, 0.01 to 10% catalyst.

[0099] In some embodiments of the present invention, in the topcoat paint, the mass ratio of the first composition to the second composition is (0.1 - 2):1; in some specific embodiments of the present invention, in the topcoat paint, the mass ratio of the first composition to the second composition is (0.3 - 1.5):1; in some examples of the present invention, in the topcoat paint, the mass ratio of the first composition to the second composition is (0.4 - 0.8):1. In some specific examples of the present invention, in the topcoat paint, the mass ratio of the first composition to the second composition is 0.4:1, 0.5:1, 0.6:1, 0.7:1 or 0.8:1.

[0100] Maintaining the mass ratio of the first composition and the second composition within a specific range can enable the product formed by reacting with the inorganic network structure to have appropriate film-forming properties and hydrophobicity, ensuring that there is no obvious phase separation phenomenon or difficulty in film formation in the system, while maintaining a relatively high surface contact angle and hydrophobic state of the system, and having a good easy-cleaning effect. If the dosage of the first composition is too much, it will lead to an obvious phase separation phenomenon in the system and difficulty in film formation, while if the dosage of the first composition is too little, it will lead to a low surface contact angle of the system and a hydrophilic state, without an easy-cleaning effect.

[0101] The second aspect of the embodiments of the present invention provides a preparation method of the silicone paint according to the first aspect of the embodiments of the present invention, including the following steps: mixing a first silicone precursor, a second silicone precursor, and a first solvent to carry out a first reaction to obtain a first composition; mixing SiX 4 , a second solvent, and a catalyst to carry out a second reaction to obtain a second composition; mixing the first composition and the second composition to carry out a third reaction to obtain a topcoat paint; using the second composition as the primer paint. By adopting this preparation method, the first silicone precursor and the second silicone precursor can first react with the first solvent to generate a product with a specific structural composition, and then further react with the inorganic network structure formed by the reaction of SiX 4 in the second composition to obtain a coating system with low surface energy and good heat resistance.

[0102] In some embodiments of the present invention, when carrying out the first reaction, first mix the first silicone precursor with the first solvent, and then add the second silicone precursor to mix and carry out the first reaction.

[0103] In some embodiments of the present invention, the first reaction is carried out at room temperature, and the room temperature is 10 - 30 °C.

[0104] In some embodiments of the present invention, the first reaction is to react until all raw materials are mixed evenly, and there is no specific limitation.

[0105] In some embodiments of the present invention, when carrying out the second reaction, first mix SiX 4 with the second solvent, and then add the catalyst to mix and carry out the second reaction.

[0106] In some embodiments of the present invention, the temperature of the second reaction is 20 to 120 °C; in some specific embodiments of the present invention, the temperature of the second reaction is 30 to 100 °C; in some examples of the present invention, the temperature of the second reaction is 55 to 80 °C. In some specific examples of the present invention, the temperature of the second reaction is 55 °C, 60 °C, 65 °C, 70 °C, 75 °C or 80 °C.

[0107] In some embodiments of the present invention, the time of the second reaction is 5 to 20 h; in some specific embodiments of the present invention, the time of the second reaction is 7 to 15 h; in some examples of the present invention, the time of the second reaction is 8 to 12 h. In some specific examples of the present invention, the time of the second reaction is 8 h, 9 h, 10 h, 11 h or 12 h.

[0108] In some embodiments of the present invention, the temperature of the second reaction is constant.

[0109] In some embodiments of the present invention, the second reaction is carried out under the condition of water bath heating.

[0110] In some embodiments of the present invention, after the second reaction, it further includes the step of the first aging.

[0111] In some embodiments of the present invention, the time of the first aging is 5 to 30 h; in some specific embodiments of the present invention, the time of the first aging is 10 to 24 h; in some examples of the present invention, the time of the first aging is 18 to 24 h. In some specific examples of the present invention, the time of the first aging is 18 h, 19 h, 20 h, 21 h, 22 h, 23 h or 24 h.

[0112] In some embodiments of the present invention, the temperature of the third reaction is 20 to 120 °C; in some specific embodiments of the present invention, the temperature of the third reaction is 30 to 100 °C; in some examples of the present invention, the temperature of the third reaction is 40 to 60 °C. In some specific examples of the present invention, the temperature of the third reaction is 40 °C, 45 °C, 50 °C, 55 °C or 60 °C.

[0113] In some embodiments of the present invention, the time of the third reaction is 2 to 15 h; in some specific embodiments of the present invention, the time of the third reaction is 4 to 10 h; in some examples of the present invention, the time of the third reaction is 4 to 5 h. In some specific examples of the present invention, the time of the third reaction is 4 h, 4.2 h, 4.5 h, 4.8 h or 5 h.

[0114] In some embodiments of the present invention, the temperature of the third reaction is constant.

[0115] In some embodiments of the present invention, the third reaction is carried out under the condition of water bath heating.

[0116] In some embodiments of the present invention, after the third reaction, a second aging step is further included.

[0117] In some embodiments of the present invention, the time of the second aging is 5 - 30 h; in some specific embodiments of the present invention, the time of the second aging is 10 - 24 h; in some examples of the present invention, the time of the second aging is 18 - 24 h. In some specific examples of the present invention, the time of the second aging is 18 h, 19 h, 20 h, 21 h, 22 h, 23 h or 24 h.

[0118] The third aspect of the embodiments of the present invention provides a silicone coating, including a primer coating and a topcoat. The primer coating is formed by the primer paint in the silicone paint of the first aspect of the embodiments of the present invention, and the topcoat is formed by the topcoat paint in the silicone paint of the first aspect of the embodiments of the present invention. The obtained primer coating provides good mechanical properties such as adhesion and impact resistance, and can improve the temperature resistance of the coating. The topcoat provides good temperature resistance and easy cleaning performance.

[0119] In some embodiments of the present invention, the thickness of the primer coating is 1 - 10 μm; in some specific embodiments of the present invention, the thickness of the primer coating is 2 - 8 μm; in some examples of the present invention, the thickness of the primer coating is 3 - 6 μm. In some specific examples of the present invention, the thickness of the primer coating is 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm or 6 μm.

[0120] In some embodiments of the present invention, the thickness of the topcoat is 0.5 - 5 μm; in some specific embodiments of the present invention, the thickness of the topcoat is 0.8 - 4 μm; in some examples of the present invention, the thickness of the topcoat is 1 - 3 μm. In some specific examples of the present invention, the thickness of the topcoat is 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.2 μm, 2.5 μm, 2.8 μm or 3 μm.

[0121] In some embodiments of the present invention, the water contact angle of the silicone coating is 103 - 110°; in some specific embodiments of the present invention, the water contact angle of the silicone coating is 103°, 104°, 105°, 106°, 107°, 108°, 109° or 110°. The water contact angle in the embodiments of the present invention is the water contact angle measured according to the standard ASTM D724 - 12.

[0122] In some embodiments of the present invention, the oil contact angle of the silicone coating is 41 to 60°; in some specific embodiments of the present invention, the water contact angle of the silicone coating is 41°, 42°, 45°, 48°, 50°, 52°, 55°, 58° or 60°. The oil contact angle in the embodiments of the present invention is the oil contact angle measured according to standard ASTM D724-12.

[0123] In some embodiments of the present invention, the heat resistance temperature of the silicone coating is 405 to 500 °C; in some specific embodiments of the present invention, the heat resistance temperature of the silicone coating is 405 °C, 410 °C, 420 °C, 430 °C, 440 °C, 450 °C, 460 °C, 470 °C, 480 °C, 490 °C or 500 °C.

[0124] In some embodiments of the present invention, the adhesion grade of the silicone coating is grade 0. The adhesion grade in the embodiments of the present invention is the adhesion grade measured according to standard GB / T 9286.

[0125] The fourth aspect of the embodiments of the present invention provides a method for preparing the silicone coating according to the third aspect of the embodiments of the present invention, comprising the following steps: successively coating a primer coating and a topcoat on a substrate, and obtaining a silicone coating after curing. This preparation method is simple and convenient to operate, and can obtain a silicone coating with heat resistance and easy cleaning.

[0126] In some embodiments of the present invention, after coating the primer coating and before coating the topcoat, a drying step is further included.

[0127] In some embodiments of the present invention, the drying time is 1 to 10 min; in some specific embodiments of the present invention, the drying time is 2 to 8 min; in some examples of the present invention, the drying time is 3 to 5 min.

[0128] In some embodiments of the present invention, the drying temperature is 10 to 30 °C; in some specific embodiments of the present invention, the drying temperature is 15 to 28 °C; in some examples of the present invention, the drying temperature is 20 to 25 °C. In some specific examples of the present invention, the drying temperature is room temperature.

[0129] In some embodiments of the present invention, the curing temperature is 50 to 220 °C; in some specific embodiments of the present invention, the curing temperature is 60 to 200 °C; in some examples of the present invention, the curing temperature is 130 to 200 °C. In some specific examples of the present invention, the curing temperature is 130 °C, 140 °C, 150 °C, 160 °C, 170 °C, 180 °C, 190 °C or 200 °C.

[0130] In some embodiments of the present invention, the curing time is 10 to 80 minutes; in some specific embodiments of the present invention, the curing time is 15 to 60 minutes; in some examples of the present invention, the curing time is 15 to 18 minutes. In some specific examples of the present invention, the curing time is 15 minutes, 16 minutes, 17 minutes or 18 minutes.

[0131] In some embodiments of the present invention, before applying the primer coating, it further includes a pretreatment step of the substrate; in some specific embodiments of the present invention, the pretreatment step of the substrate is degreasing and cleaning the substrate, and sandblasting and other pretreatment are not required.

[0132] In some embodiments of the present invention, the substrate includes at least one of stainless steel, aluminum-plated sheet, galvanized sheet or cold-rolled steel.

[0133] The fifth aspect of the embodiments of the present invention provides a kitchen appliance, including the silicone coating of the third aspect of the embodiments of the present invention. The kitchen appliance obtained therefrom includes a silicone coating, which has good high-temperature resistance, easy cleaning and mechanical properties, and can well meet the requirements of the high-temperature and heavy oil pollution environment in the kitchen. Therefore, the kitchen appliance provided with the silicone coating also has good temperature resistance and easy cleaning properties, and the mechanical properties such as the adhesion and impact resistance of the coating are good.

[0134] In some embodiments of the present invention, the kitchen appliance includes at least one of an oven, a cooking range or a range hood; in some specific embodiments of the present invention, the oven includes at least one of an electric oven, a gas oven or a steam oven; in some examples of the present invention, the substrate of the oven includes at least one of stainless steel, aluminum-plated sheet, galvanized sheet or cold-rolled steel.

[0135] The following further describes the content of the present invention in detail with specific embodiments.

[0136] In the following examples and comparative examples, the ethanol aqueous solution is composed of 60 wt% ethanol and 40 wt% water; the dosage percentage of each raw material is the mass percentage.

[0137] Example 1

[0138] A silicone coating, composed of a primer coating and a topcoat, and the specific preparation method is as follows:

[0139] 1) Mix and stir 35% methyltrimethoxysilane with 50% ethanol aqueous solution, and then add 15% phenyltrimethoxysilane to obtain a first composition;

[0140] 2) adding 15% tetraethoxysilane to 82% ethanol aqueous solution and stirring evenly, adding 3% hydrochloric acid and heating in a water bath to 60° C., reacting at a constant temperature for 10 hours, aging for 24 hours to obtain a second composition, and dividing the second composition into two parts, one of which is used as a primer coating and the other is for standby use;

[0141] 3) The first composition obtained in step 1) and part of the second composition obtained in step 2) are mixed and stirred in a mass ratio of 0.5:1, reacted in a 45° C. water bath for 4 hours, and aged for 24 hours to obtain a topcoat coating.

[0142] Application Example 1

[0143] An organic silicon coating is composed of a primer coating and a top coating, and the specific preparation method is as follows:

[0144] First, the primer coating of the silicone coating of Example 1 was sprayed into the oven cavity of the aluminum plate, and the surface was dried at room temperature for 3 minutes to obtain a primer coating, and then the top coating was sprayed on the surface of the primer coating, and finally cured at 200° C. for 15 minutes to form a top coating. The primer coating had a thickness of 4 μm and the top coating had a thickness of 2 μm.

[0145] Example 2

[0146] An organic silicon coating is composed of a primer coating and a top coating, and the specific preparation method is as follows:

[0147] 1) mixing 17% methyltrichlorosilane and 70% ethanol aqueous solution, and then adding 13% dodecyltrimethoxysilane to obtain a first composition;

[0148] 2) adding 36% tetraethoxysilane to 63% ethanol aqueous solution and stirring evenly, adding 1% formic acid and heating in a water bath to 30° C., reacting at a constant temperature for 10 hours, aging for 10 hours to obtain a second composition, dividing the second composition into two parts, one of which is used as a primer coating, and the other is for standby use;

[0149] 3) The first composition obtained in step 1) and part of the second composition obtained in step 2) are mixed and stirred in a mass ratio of 2:1, reacted in a 30° C. water bath for 10 hours, and aged for 10 hours to obtain a topcoat coating.

[0150] Application Example 2

[0151] An organic silicon coating is composed of a primer coating and a top coating, and the specific preparation method is as follows:

[0152] First, spray the primer coating of the silicone coating in Example 2 onto the inner cavity of a cold-rolled steel oven. Allow it to dry to the touch at room temperature for 3 minutes to obtain the primer coating. Then, spray the topcoat onto the surface of the primer coating. Finally, cure it at 80 °C for 20 minutes to form the topcoat. Among them, the thickness of the primer coating is 4 μm, and the thickness of the topcoat is 2 μm.

[0153] Example 3

[0154] A silicone coating consists of a primer coating and a topcoat. The specific preparation method is as follows:

[0155] 1) Mix 19% hexamethyldisilazane with 65% ethanol aqueous solution and stir, then add 16% diphenyldimethoxysilane to obtain the first composition;

[0156] 2) Add 56% tetraethoxysilane to 43.95% ethanol aqueous solution and stir evenly. Add 0.05% sodium hydroxide and heat it in a water bath to 100 °C. React at a constant temperature for 10 h and age for 10 h to obtain the second composition. Divide the second composition into two parts, one part as the primer coating and the other part for later use;

[0157] 3) Mix and stir the first composition obtained in step 1) and the partial second composition obtained in step 2) according to a mass ratio of 1:1. React at 100 °C in a water bath for 6 h and age for 20 h to obtain the topcoat.

[0158] Application Example 3

[0159] A silicone coating consists of a primer coating and a topcoat. The specific preparation method is as follows:

[0160] First, spray the primer coating of the silicone coating in Example 3 onto the inner cavity of a stainless-steel oven. Allow it to dry to the touch at room temperature for 3 minutes to obtain the primer coating. Then, spray the topcoat onto the surface of the primer coating. Finally, cure it at 120 °C for 35 minutes to form the topcoat. Among them, the thickness of the primer coating is 4 μm, and the thickness of the topcoat is 2 μm.

[0161] Example 4

[0162] A silicone coating is composed of a primer coating and a topcoat. The specific preparation method is as follows:

[0163] 1) Mix 48% dimethylethylchlorosilane with 20% ethanol aqueous solution and stir, then add 32% cetyltrimethoxysilane to obtain the first composition;

[0164] 2) adding 4% tetraethoxysilane to 86% ethanol aqueous solution and stirring evenly, adding 10% acetic acid and heating in a water bath to 50° C., reacting at a constant temperature for 10 hours, aging for 10 hours to obtain a second composition, dividing the second composition into two parts, one part of which is used as a primer coating, and the other part is for standby use;

[0165] 3) The first composition obtained in step 1) and part of the second composition obtained in step 2) are mixed and stirred in a mass ratio of 0.1:1, reacted in a water bath at 80° C. for 10 hours, and aged for 15 hours to obtain a topcoat coating.

[0166] Application Example 4

[0167] An organic silicon coating is composed of a primer coating and a top coating, and the specific preparation method is as follows:

[0168] First, the primer coating of the silicone coating of Example 4 was sprayed into the galvanized sheet oven cavity, and the surface was dried at room temperature for 3 minutes to obtain a primer coating, and then the top coating was sprayed on the surface of the primer coating, and finally cured at 60° C. for 60 minutes to form a top coating. The primer coating had a thickness of 4 μm and the top coating had a thickness of 2 μm.

[0169] Comparative Example 1

[0170] An organic silicon coating, which differs from Example 1 in that: the first composition does not include methyltrimethoxysilane, that is, the first composition is composed of the following raw materials in mass percentage: 50% phenyltrimethoxysilane and 50% ethanol aqueous solution. Other raw materials and preparation methods are the same as those in Example 1.

[0171] Application Comparative Example 1

[0172] An organic silicon coating is composed of a primer coating and a top coating, and the specific preparation method is as follows:

[0173] First, the primer coating of the silicone coating of Comparative Example 1 was sprayed into the oven cavity of the aluminum plate, and the surface was dried at room temperature for 3 minutes to obtain the primer coating, and then the top coating was sprayed on the surface of the primer coating, and finally cured at 200°C for 15 minutes to form the top coating. The thickness of the primer coating was 4 μm, and the thickness of the top coating was 2 μm.

[0174] Comparative Example 2

[0175] An organic silicon coating, which differs from Example 1 in that: the first composition does not include phenyltrimethoxysilane, that is, the first composition is composed of the following raw materials in mass percentage: 50% methyltrimethoxysilane and 50% ethanol aqueous solution. Other raw materials and preparation methods are the same as those in Example 1.

[0176] Application Comparative Example 2

[0177] An organosilicon coating, consisting of a primer coating and a topcoat coating, and the specific preparation method is as follows:

[0178] First, spray the primer coating of the organosilicon coating in Comparative Example 2 into the oven cavity of the aluminized steel plate, and dry it at room temperature for 3 minutes to obtain the primer coating. Then, spray the topcoat coating on the surface of the primer coating, and finally cure it at 200°C for 15 minutes to form the topcoat coating. Among them, the thickness of the primer coating is 4μm, and the thickness of the topcoat coating is 2μm.

[0179] Comparative Example 3

[0180] An organosilicon coating, different from that in Example 1 in that: it does not include the primer coating, that is, the coating in this example is composed of the topcoat coating prepared in Example 1.

[0181] Application of Comparative Example 3

[0182] An organosilicon coating, consisting only of a topcoat coating, and the specific preparation method is as follows:

[0183] Spray the organosilicon coating in Comparative Example 3 into the oven cavity of the aluminized steel plate, and cure it at 200°C for 15 minutes to obtain the organosilicon coating. The thickness of the coating is 6μm.

[0184] Comparative Example 4

[0185] An organosilicon coating, different from that in Example 1 in that: the topcoat coating is composed of the following preparation raw materials: a first composition and a second composition with a mass ratio of 3:1; other preparation raw materials and preparation methods are the same as those in Example 1.

[0186] Application of Comparative Example 4

[0187] An organosilicon coating, consisting of a primer coating and a topcoat coating, and the specific preparation method is as follows:

[0188] First, spray the primer coating of the organosilicon coating in Comparative Example 4 into the oven cavity of the aluminized steel plate, and dry it at room temperature for 3 minutes to obtain the primer coating. Then, spray the topcoat coating on the surface of the primer coating. Due to obvious phase separation in the topcoat coating system, the film-forming property is poor, and it is difficult to form a complete coating.

[0189] Comparative Example 5

[0190] An organosilicon coating, different from that in Example 1 in that: the topcoat coating is composed of the following preparation raw materials: a first composition and a second composition with a mass ratio of 0.05:1; other preparation raw materials and preparation methods are the same as those in Example 1.

[0191] Application of Comparative Example 5

[0192] An organosilicon coating, which consists of a primer coating and a topcoat coating, and the specific preparation method is as follows:

[0193] First, spray the primer coating of the organosilicon coating in Comparative Example 5 into the oven cavity of the aluminized steel plate, and dry it at room temperature for 3 minutes to obtain the primer coating. Then, spray the topcoat coating on the surface of the primer coating, and finally cure it at 200 °C for 15 minutes to form the topcoat coating. Among them, the thickness of the primer coating is 4 μm, and the thickness of the topcoat coating is 2 μm.

[0194] Performance testing

[0195] Perform the following performance tests on the coatings prepared in Application Examples 1-4 and Application Comparative Examples 1-5:

[0196] 1. Test the water contact angle, oil contact angle, and adhesion of the coating. The test method is as follows: The water and oil contact angles are tested using an instrument contact angle tester, and the test standard is ASTM D724-12; the adhesion is tested using a film cross-cut tester, and the test standard refers to GB / T9286.

[0197] 2. Test the easy-cleaning performance of the coating. The test method is as follows: Place the sauce on the sample plate, place it at 250 °C for 2 hours, wipe the surface with a scouring pad weighing 1 kg. If 80% of the oil stain area can be wiped off within 5 times, the high-temperature easy-cleaning performance is excellent, otherwise it is poor.

[0198] 3. Test the mechanical impact resistance of the coating. The test method is as follows: According to the method for determining the impact resistance of paint films in GB / T 1732-2020, after the sample plate to be tested is impacted by 50 kg·cm, if there are only fine cracks at the edge of the dent and no wrinkles or peeling and other phenomena occur, the impact resistance is "no peeling", otherwise it is "peeling".

[0199] 4. Test the heat resistance of the coating. The test method is as follows: After assembling the oven cavity coated with the coating into a complete machine, conduct a life test. Place the sauce at the bottom of the oven near the heating tube, adjust the oven temperature so that the bottom of the oven is at a certain temperature, and the running time is 1.5 hours. After the operation is completed and the oven cools down, clean it with a scouring pad. This is one cycle. After testing for 500 hours, if the oil stain is difficult to clean, end the test. Record the temperature at the bottom of the oven as the heat-resistant temperature of the coating.

[0200] The test results are recorded in Table 1.

[0201] Table 1 Performance test results of the coatings prepared in Application Examples 1-4 and Application Comparative Examples 1-5

[0202]

[0203] As can be seen from Table 1, compared with the application comparative examples, the coatings prepared in Application Examples 1 to 4 of the present invention have high advantages in terms of adhesion, high temperature resistance, impact resistance, easy cleaning, etc. The coatings prepared in Application Comparative Example 1 and Application Comparative Example 2 have poor easy cleaning effect and poor temperature resistance at 300-350 °C; the coating in Application Comparative Example 3 has low adhesion, and the coating is easy to fall off during the mechanical impact test; Application Comparative Example 4 uses too much of the first composition, resulting in obvious phase separation in the system, poor film-forming property, and difficulty in forming a complete coating; Application Comparative Example 5 uses too little of the first composition, the contact angle on the coating surface is low and shows a hydrophilic state, and it does not have the property of easy cleaning.

[0204] Among them, the process of testing the easy cleaning performance of the coating in Application Example 1 is as Figure 1 shown. (A) is an un-wiped picture of placing sauce on the coating in Application Example 1 at 250 °C for 2 h, and (B) is a picture of the coating after wiping the surface with a scouring pad with a load of 1 kg. Within 5 wipes, 80% of the oil stain area can be wiped off, and it has better easy cleaning performance. The process of testing the mechanical impact resistance of the coating in Application Example 1 is as Figure 2 shown. After the coating sample of Application Example 1 is impacted at 50 kg·cm, there are only fine cracks at the edge of the dent, and no wrinkles or peeling occur, and the mechanical impact resistance of the coating is good. After the oven cavity coated with the coating of Application Example 1 is assembled into a complete machine, a life test is carried out, that is, the sauce is placed at the bottom of the oven near the heating tube (temperature greater than 400 °C), the oven temperature is set at 220 °C, and the time is 1.5 h. After the operation is completed and the oven is cooled, it is cleaned with a scouring pad. This is one cycle, and the test ends until the ingredients are difficult to clean. After 500 hours of testing, the oven cavity still maintains better easy cleaning performance, the coating has good temperature resistance and long service life. The performance of Application Examples 2 to 4 is similar to that of Application Example 1.

[0205] In the embodiments of the present invention, when the silicone coating of the embodiments of the present invention is applied to kitchen appliances, kitchen appliances with high temperature resistance and easy cleaning can be obtained. Among them, the kitchen appliances include ovens, stoves or range hoods; the ovens include electric ovens, gas ovens or steam ovens.

[0206] The embodiments of the present invention adopt three organosilicon compounds with specific structures, and through specific reactions of the three, a coating system with good temperature resistance, hydrophobicity, adhesion, impact resistance, etc. is formed. Using this coating system, a coating with high temperature resistance, easy cleaning and good mechanical properties can be obtained, and it can well meet the requirements of the high temperature and heavy oil pollution environment in the kitchen when used for the protection of kitchen appliances, especially ovens.

[0207] In the description of this specification, the descriptions referring to terms such as "some embodiments", "examples", or "specific embodiments" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An organosilicon coating, characterized in that, it comprises a primer coating and a topcoat; the topcoat comprises the following preparation raw materials: a first composition, a second composition; the primer coating comprises the following preparation raw materials: the second composition; the first composition comprises the following preparation raw materials: a first organosilicon precursor, a second organosilicon precursor, a first solvent; The second composition comprises the following raw materials for preparation: SiX 4 , a second solvent, and a catalyst; The first organosilicon precursor includes RSiX 3 , R 2 SiX 2 , R 3 SiX or R 3 SiX’SiR 3 ; the second organosilicon precursor includes YSiX 3 , Y 2 SiX 2 , Y 3 SiX or SiY 4 ; at least one of them; wherein each X is independently selected from -OR or halogen; each X' is independently selected from -O- or -NR-; each Y is independently selected from a C6-C10 aryl group or a C8-C30 alkyl group; each R is independently selected from H or a C1-C7 alkyl group.

2. The organosilicon coating according to claim 1, characterized in that, each Y is independently selected from phenyl, tolyl, ethylphenyl or a C10-C20 alkyl group; and / or, each R is independently selected from H, methyl, ethyl or propyl.

3. The organosilicon coating according to claim 1 or 2, characterized in that, the first organosilicon precursor comprises at least one of trimethoxysilane, triethoxysilane, tripropoxysilane, methyltrichlorosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, dimethyldimethoxysilane, diethyldiethoxysilane, dipropyldipropoxysilane, trimethylmethoxysilane, triethylethoxysilane, tripropylpropoxysilane, dimethylethylchlorosilane, diethylmethylchlorosilane, trimethylfluorosilane, trimethylbromosilane, trimethyliodosilane, hexamethyldisiloxane or hexamethyldisilazane; and / or, the second organosilicon precursor comprises at least one of phenyltrimethoxysilane, phenyltriethoxysilane, phenyltripropoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, xylyldimethoxysilane, triphenylmethoxysilane, tetraphenylsilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, dodecyldimethylmethoxysilane or dodecyltrimethylsilane.

4. The organosilicon coating according to claim 1 or 2, characterized in that, The SiX 4 comprises at least one of tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, or trimethoxychlorosilane.

5. The organosilicon coating according to claim 1, characterized in that, the catalyst comprises at least one of hydrochloric acid, sulfuric acid, nitric acid, ammonia water, sodium hydroxide, acetic acid or formic acid; and / or, the first solvent and the second solvent independently comprise an organic solvent and water.

6. The organosilicon coating according to claim 1, characterized in that, in the first composition, the mass percentage of the first organosilicon precursor is 10-50%; and / or, the mass percentage of the second organosilicon precursor is 1-40%.

7. The organosilicon coating according to claim 1, characterized in that, in the first composition, the mass percentage of the first solvent is 10-85%.

8. The organosilicon coating according to claim 1, characterized in that, in the first composition, the mass ratio of the first organosilicon precursor to the second organosilicon precursor is 1:(0.1-0.9).

9. The organosilicon coating according to claim 1, characterized in that, In the second composition, the mass percentage of SiX 4 is 1 to 60%.

10. The organosilicon coating according to claim 1, characterized in that, In the second composition, the mass percentage of the second solvent is 35 to 90%; and / or, in the second composition, the mass percentage of the catalyst is 0.005 to 15%.

11. The silicone coating according to claim 1, wherein, in the topcoat, the mass ratio of the first composition to the second composition is (0.1 to 2):

1.

12. The silicone coating according to claim 1, wherein, the mass ratio of the primer coating to the topcoat is 1:(0.5 to 1.5).

13. The method for preparing the silicone coating according to any one of claims 1 to 12, wherein, it comprises the following steps: Mix the first silicone precursor, the second silicone precursor, and the first solvent to carry out a first reaction to obtain the first composition; mix SiX 4 , the second solvent, and the catalyst to carry out a second reaction to obtain the second composition; mix the first composition and the second composition to carry out a third reaction to obtain the topcoat paint; using the second composition as the primer coating.

14. The preparation method according to claim 13, wherein, the temperature of the second reaction is 20 to 120°C; and / or, the time of the second reaction is 5 to 20 h; and / or, the temperature of the third reaction is 20 to 120°C; and / or, the time of the third reaction is 2 to 15 h.

15. The preparation method according to claim 13, wherein, after the second reaction, it further comprises a step of first aging; and / or, after the third reaction, it further comprises a step of second aging.

16. A silicone coating, wherein, it comprises a primer coating and a topcoat. The primer coating is formed from the primer coating in the silicone coating according to any one of claims 1 to 12, and the topcoat is formed from the topcoat in the silicone coating according to any one of claims 1 to 12.

17. The silicone coating according to claim 16, wherein, the thickness of the primer coating is 1 to 10 μm, and the thickness of the topcoat is 0.5 to 5 μm; and / or, the water contact angle of the silicone coating is 103 to 110°; and / or, the oil contact angle of the silicone coating is 41 to 60°; and / or, the adhesion grade of the silicone coating is grade 0.

18. The method for preparing the silicone coating according to claim 16 or 17, comprises the following steps: coating the primer coating and the topcoat on the substrate in sequence, and obtaining the silicone coating after curing.

19. A kitchen appliance, wherein, it comprises the silicone coating according to claim 16 or 17.

20. The kitchen appliance according to claim 19, wherein, the kitchen appliance comprises at least one of an oven, a cooking range or a range hood.

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