Water-based inorganic paint, inorganic coating, preparation method thereof, components and automobile

Abstract

This application relates to a water-based inorganic paint, an inorganic coating, a preparation method thereof, components, and an automobile. The water-based inorganic paint comprises the following components, measured by weight: 100-140 parts flaky corundum powder, 50-70 parts water-soluble silicate, 4-10 parts polyol phosphate, and 90-120 parts water. The flaky corundum powder serves as the primary high-temperature resistant material, along with polyol phosphate and water-soluble silicate. These components interact in specific proportions to form an inorganic coating applied to a metal substrate. The coating exhibits excellent high-temperature resistance, strong adhesion, and corrosion resistance even at temperatures exceeding 500°C.

Description

Technical Field

[0001] The present application relates to the field of coatings, and in particular to a water-based inorganic coating, an inorganic coating, a preparation method thereof, components and an automobile. Background Art

[0002] In the automotive industry, exhaust pipes, brake discs and other automotive components will generate high temperatures under normal working conditions, with local temperatures reaching 500°C or above. Therefore, high-temperature resistant coatings are usually applied to the surface of the components to keep them in good appearance at normal working temperatures. High-temperature resistant coatings are also called heat-resistant coatings. At ambient temperatures above 200°C, the high-temperature resistant coating formed by the high-temperature resistant coating will not have cracking, peeling, or shedding. According to the different film-forming materials, they are divided into organic high-temperature resistant coatings and inorganic high-temperature resistant coatings. Compared with organic high-temperature resistant coatings, inorganic high-temperature resistant coatings have the characteristics of being green, environmentally friendly, pollution-free, and having high hardness. However, traditional inorganic high-temperature resistant coatings have poor high-temperature resistance. For example, after being used in a high-temperature environment exceeding 500°C, their adhesion is low and their corrosion resistance is poor. Summary of the Invention

[0003] Based on this, the present application provides a water-based inorganic coating that can form a coating with excellent high-temperature resistance and a preparation method thereof, as well as a water-based inorganic coating, components and automobiles.

[0004] The technical solution of this application to solve the above technical problems is as follows.

[0005] On the one hand, the present application provides a water-based inorganic coating, which comprises the following components in parts by mass:

[0006]

[0007] In some embodiments, the water-based inorganic coating comprises the following components in parts by mass:

[0008]

[0009] The mass ratio of the flaky corundum powder to the polyol phosphate is (15-25):1.

[0010] In some embodiments, in the water-based inorganic coating, the silicate includes at least one of sodium silicate, potassium silicate and lithium silicate.

[0011] In some embodiments, in the waterborne inorganic coating, the polyol phosphate includes at least one of inositol hexaphosphate, pentaerythritol phosphate and aminotrimethylenephosphonic acid.

[0012] In some embodiments, in the water-based inorganic coating, the particle size of the flaky corundum powder is 5 μm to 15 μm.

[0013] In some embodiments, the water-based inorganic coating further comprises, by weight of the water-based inorganic coating, 0.2 to 0.5 parts of a wetting and leveling agent.

[0014] In some embodiments, in the water-based inorganic coating, the wetting and leveling agent includes at least one of BYK378, HT-4000, and Tego Wet 70.

[0015] In some embodiments, the water-based inorganic coating further comprises 10 to 18 parts by mass of metal powder.

[0016] In some embodiments, in the water-based inorganic coating, the mass ratio of the metal powder to the flaky corundum powder is (0.1-0.15):1.

[0017] In some embodiments, in the water-based inorganic coating, the metal powder includes at least one of zinc powder and aluminum powder.

[0018] The present application provides an inorganic coating obtained by curing the above-mentioned water-based inorganic coating.

[0019] The present application provides a method for preparing an inorganic coating, comprising the following steps:

[0020] The water-based inorganic coating is coated on a substrate and cured to form the inorganic coating.

[0021] In some embodiments, in the method for preparing the inorganic coating, the curing temperature is 80°C to 800°C.

[0022] The present application provides a component containing an inorganic coating, comprising a substrate and the inorganic coating disposed on the surface of the substrate.

[0023] In some embodiments, in the component comprising the inorganic coating, the substrate comprises a metal substrate.

[0024] The present application provides a car comprising the above components.

[0025] Compared with the prior art, the water-based inorganic coating of the present application has the following beneficial effects:

[0026] The above-mentioned water-based inorganic coating uses flaky corundum powder as the main high-temperature resistant material, and is matched with polyol phosphate and water-soluble silicate. The components work together in a specific proportion. When coated on the surface of a metal substrate, it can be complexed and coordinated with the metal substrate to form a molecular protective film on the metal surface with good density, effectively blocking external corrosive media from entering the surface of the metal substrate. The inorganic coating formed by the water-based inorganic coating has good high-temperature resistance, and it still has high adhesion and good corrosion resistance when used at temperatures exceeding 500°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 A state diagram of the inorganic coating A1 formed in Example 1;

[0029] Figure 2 This is a state diagram of the inorganic coating A2 formed in Example 1. DETAILED DESCRIPTION

[0030] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are described below. Each example is provided to illustrate, not to limit, the present invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment may be used in another embodiment to produce further embodiments.

[0031] Therefore, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present invention are disclosed in or are obvious from the following detailed description. Those skilled in the art will appreciate that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The indefinite articles "a" and "an" before the elements or components of the present invention have no restriction on the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the quantity obviously refers only to the singular form. The meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] The weights of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally increased or decreased according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the weights mentioned in the description of the embodiments of the present invention may be mass units known in the chemical industry, such as μg, mg, g, and kg.

[0035] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the appended claims are approximate values, and those skilled in the art will be able to appropriately change these approximate values ​​using the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0036] One embodiment of the present application provides a water-based inorganic coating, which comprises the following components in parts by mass:

[0037]

[0038] The water-based inorganic coating, primarily composed of flaky corundum powder and a polyol phosphate and water-soluble silicate, works together in specific proportions. When applied to a metal substrate, it forms a complexing and coordinated molecular protective film with the metal, effectively blocking external corrosive media from entering the metal surface. The inorganic coating formed by this water-based inorganic coating also exhibits excellent high-temperature resistance, maintaining strong adhesion and excellent corrosion resistance even at temperatures exceeding 500°C. The water-based inorganic coating has a simple formulation and is environmentally friendly and pollution-free.

[0039] It is understood that, by weight, flaky corundum powder includes, but is not limited to, 100 parts, 102 parts, 105 parts, 108 parts, 110 parts, 112 parts, 115 parts, 118 parts, 120 parts, 122 parts, 125 parts, 128 parts, 130 parts, 132 parts, 135 parts, 138 parts, and 140 parts; water-soluble silicate includes, but is not limited to, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 64 parts, and 65 parts; polyol phosphate includes, but is not limited to, 5 parts, 6 parts, 7 parts, 8 parts, and 9 parts; and water includes, but is not limited to, 90 parts, 95 parts, 100 parts, 105 parts, 110 parts, 115 parts, and 120 parts. In some examples, the range may be formed by any two of these values ​​as endpoints, the same applies hereinafter.

[0040] In some examples, the water-based inorganic coatings include the following components by weight:

[0041]

[0042] In some of these examples, the mass ratio of flake corundum powder to polyol phosphate in water-based inorganic coatings is (14-24):1.

[0043] It is understood that the mass ratio of flaky corundum powder to polyol phosphate includes but is not limited to 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, 21:1, 22:1, 23:1, and 24:1.

[0044] Optionally, the mass ratio of the flaky corundum powder to the polyol phosphate is (14-20):1.

[0045] In some examples, in the water-based inorganic coating, the water-soluble silicate includes at least one of sodium silicate, potassium silicate, and lithium silicate.

[0046] Optionally, the water-soluble silicate comprises sodium silicate.

[0047] It will be appreciated that polyol phosphates can be obtained by dehydrating polyols with phosphoric acid or phosphorous acid.

[0048] Furthermore, the polyol molecule contains three or more hydroxyl groups, and its general formula is R1-(OH) x (x≥3); further, the number of carbon atoms in R1 does not exceed 10.

[0049] In some examples, in the waterborne inorganic coating, the polyol phosphate includes at least one of phytate, pentaerythritol phosphate (PEPA), and aminotrimethylenephosphonic acid (ATMP).

[0050]

[0051] The above-mentioned specific type of polyol phosphate further increases the density of the coating through ion complexation and atomic coordination effects with the metal substrate, and at the same time provides phosphate ions to participate in the sintering reaction at high temperatures exceeding 450°C, thereby improving the high-temperature resistance of the coating.

[0052] It can be understood that the main component of flaky corundum powder is α-aluminum oxide, with a content greater than 99%. It should be stored in a sealed and dry place to avoid moisture.

[0053] Furthermore, the flaky corundum powder includes but is not limited to flaky corundum powder and columnar flaky corundum powder.

[0054] In some of these examples, flake corundum powder is used as flake corundum powder in water-based inorganic coatings.

[0055] Furthermore, the flaky corundum powder includes but is not limited to flaky white corundum powder and flaky brown corundum powder.

[0056] In some of these examples, the particle size of the flake corundum powder in water-based inorganic coatings is 5 μm to 15 μm.

[0057] It can be understood that the particle size of the flaky corundum powder refers to the maximum size of the flaky corundum powder; it can be further understood that the particle size of the flaky corundum powder includes but is not limited to 5μm, 6μm, 8μm, 10μm, 12μm, 13μm, and 15μm.

[0058] In some of the examples, the water-based inorganic coating further includes 0.2 to 0.5 parts of a wetting and leveling agent, calculated by weight in the water-based inorganic coating.

[0059] It can be understood that, in terms of weight percentage in the water-based inorganic coating, the wetting and leveling agent in the water-based inorganic coating includes but is not limited to 0.2 part, 0.3 part, 0.4 part, and 0.5 part.

[0060] In some examples, the water-based inorganic coatings are composed of the following components by weight:

[0061]

[0062] The components of the water-based inorganic coatings in the above examples do not contain metal powder.

[0063] In some of the examples, in the waterborne inorganic coating, the wetting and leveling agent includes at least one of BYK378, HT-4000, and TegoWet 70.

[0064] In some of the examples, the water-based inorganic coating further comprises 10 to 18 parts of metal powder, calculated by weight in the water-based inorganic coating.

[0065] At temperatures exceeding 450°C, polyol phosphates, water-soluble silicates, and metal powders form a tripolyphosphate metal salt layer, which further enhances the density of the protective film. Simultaneously, some metal powders transform into oxides at high temperatures, increasing their mass without losing weight. This effectively minimizes component loss and structural changes even at temperatures exceeding 500°C. The aforementioned water-based inorganic coating, incorporating flaky corundum powder, polyol phosphates, and water-soluble silicates, along with metal powders, further enhances the density of the molecular protective film, thereby further improving its high-temperature resistance.

[0066] It can be understood that, in terms of weight percentage in the water-based inorganic coating, the metal powder in the water-based inorganic coating includes but is not limited to 10 parts, 11 parts, 12 parts, 14 parts, 15 parts, 16 parts, and 18 parts.

[0067] In some examples, the water-based inorganic coatings include the following components by weight:

[0068]

[0069]

[0070] In some examples, the water-based inorganic coatings include the following components by weight:

[0071]

[0072] In some of these examples, the mass ratio of metal powder to flaky corundum powder in water-based inorganic coatings is (0.1 to 0.15):1.

[0073] It can be understood that the mass ratio of metal powder to flaky corundum powder includes but is not limited to 0.1:1, 0.12:1, 0.13:1, 0.14:1, and 0.15.

[0074] In some examples, in the water-based inorganic coating, the metal powder includes at least one of zinc powder and aluminum powder.

[0075] It can be understood that when water-based inorganic coatings are used under high temperature conditions exceeding 450°C, polyol phosphate and metal powder are sintered to form a dense layer of tripolyphosphate metal such as zinc tripolyphosphate, aluminum tripolyphosphate, etc.; and the higher the temperature, the better the densification effect, which can be as high as 1000°C.

[0076] The use of specific types of metal powder can further improve the high temperature resistance of the inorganic coating formed by water-based inorganic coatings.

[0077] In some of these examples, the particle size of the metal powder in the water-based inorganic coating is 1 nm to 100 nm.

[0078] It is understood that the particle size of the metal powder includes but is not limited to 1 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, and 100 nm.

[0079] It is understood that the metal powder should be stored in a sealed and dry place to avoid moisture.

[0080] An embodiment of the present application provides a method for preparing a water-based inorganic coating, comprising the following steps:

[0081] The components of the water-based inorganic coating are mixed evenly to obtain the water-based inorganic coating.

[0082] In some examples, the method for preparing the water-based inorganic coating includes the following steps:

[0083] diluting the polyol phosphate ester with water to obtain a polyol phosphate ester solution;

[0084] Mix the silicate and water evenly, add the polyol phosphate solution, then add the flaky corundum powder and wetting and leveling agent and disperse.

[0085] In some of the examples, when the water-based inorganic coating contains metal powder, in the preparation method of the water-based inorganic coating, after adding the polyol phosphate solution, flaky corundum powder, metal powder and a wetting and leveling agent are added and dispersed.

[0086] In some examples, in the method for preparing the water-based inorganic coating, a polyol phosphate solution is added dropwise to a mixed solution of silicate and water, and further, the addition is performed while stirring.

[0087] In some of the examples, in the method for preparing the water-based inorganic coating, the mass ratio of the polyol phosphate to water in the polyol phosphate solution is (0.8-1):(3-5).

[0088] It is understood that when the water-based inorganic coating does not contain metal powder, metal powder does not need to be added in the preparation method.

[0089] One embodiment of the present application provides an inorganic coating obtained by curing the above-mentioned water-based inorganic coating.

[0090] The inorganic coating provided in this application has good high temperature resistance and still has high adhesion and good corrosion resistance even after being used under high temperature conditions exceeding 500°C.

[0091] An embodiment of the present application provides a method for preparing an inorganic coating, comprising the following steps:

[0092] The water-based inorganic coating is applied on a substrate and cured to form an inorganic coating.

[0093] In some of the examples, in the method for preparing the inorganic coating, the curing temperature is 21° C. to 90° C.

[0094] Furthermore, the curing is carried out at 21° C. to 25° C. for 20 to 30 hours; or at 80° C. to 90° C. for 20 to 30 minutes.

[0095] One embodiment of the present application provides a component containing an inorganic coating, including a substrate and the inorganic coating disposed on the surface of the substrate.

[0096] Furthermore, the substrate includes a metal substrate.

[0097] Furthermore, the substrate includes a steel plate or stainless steel.

[0098] It will be understood that components containing inorganic coatings include, but are not limited to, automotive components, household appliance components, and aerospace components.

[0099] Furthermore, automobile components include but are not limited to exhaust pipes and brake discs.

[0100] An embodiment of the present application provides a component protection method, comprising the following steps:

[0101] The inorganic coating is placed on the surface of the component substrate and solidified to form an inorganic coating on the surface of the component substrate.

[0102] It can be understood that the inorganic coating formed on the surface of the component substrate has good high-temperature resistance. Even when the component is used under high-temperature conditions exceeding 500°C, it still has good corrosion resistance.

[0103] In some of these examples, the thickness of the inorganic coating in the component protection method is 20μm to 30μm.

[0104] It can be understood that the thickness of the inorganic coating includes but is not limited to 20 μm, 22 μm, 25 μm, 28 μm, and 30 μm.

[0105] In some of these examples, in the component protection method, the method of setting the water-based inorganic coating on the surface of the component substrate includes but is not limited to coating, spraying, etc.

[0106] In some examples, the component protection method further includes performing surface treatment on the component surface before applying the water-based inorganic coating on the component substrate surface.

[0107] Furthermore, the surface treatment includes sandblasting, shot blasting, manual polishing, etc.

[0108] Furthermore, the surface is treated to Sa2.5 or above.

[0109] One embodiment of the present application provides a car, comprising the above-mentioned component containing the inorganic coating.

[0110] To facilitate understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0111] Unless otherwise specified, the raw materials involved in the following specific examples can all be sourced from commercial sources, and the instruments used can all be sourced from commercial sources unless otherwise specified.

[0112] Example 1

[0113] Water-based inorganic coating components: 56 parts by weight of sodium silicate, 8 parts by weight of phytate, 115 parts by weight of water, 115 parts by weight of flaky brown corundum powder with a particle size of 10 μm, 15 parts by weight of zinc powder with a particle size of 50 nm, and 0.3 parts by weight of a wetting and leveling agent of specification BYK378;

[0114] First, mix sodium silicate and water, add diluted phytate (phytate: water = 1:5) dropwise while stirring, continue stirring at room temperature for 10 minutes, transfer the mixed solution to a dispersion barrel, add flaky brown corundum powder and wetting and leveling agent, and disperse at high speed for 20 minutes, vacuum degassing, and discharge to obtain a water-based inorganic coating.

[0115] Example 2

[0116] The water-based inorganic coating components include: 55 parts by weight of sodium silicate, 76 parts by weight of inositol hexaphosphate, 105 parts by weight of water, 110 parts by weight of flaky brown corundum powder with a particle size of 10 μm, 12 parts by weight of zinc powder with a particle size of 50 nm, and 0.3 parts by weight of a wetting and leveling agent with a specification of BYK378; the preparation method is the same as that of Example 1.

[0117] Example 3

[0118] The water-based inorganic coating components include: 56 parts by weight of sodium silicate, 5 parts by weight of inositol hexaphosphate, 115 parts by weight of water, 120 parts by weight of flaky brown corundum powder with a particle size of 10 μm, 10 parts by weight of zinc powder with a particle size of 50 nm, and 0.3 parts by weight of a wetting and leveling agent with a specification of BYK378; the preparation method is the same as that of Example 1.

[0119] Example 4

[0120] The water-based inorganic coating components include: 57 parts by weight of sodium silicate, 7 parts by weight of inositol hexaphosphate, 110 parts by weight of water, 130 parts by weight of flaky brown corundum powder with a particle size of 10 μm, and 0.3 parts by weight of a wetting and leveling agent with a specification of BYK378; the preparation method is the same as that of Example 1.

[0121] Example 5

[0122] Water-based inorganic coating components: 65 parts by weight of sodium silicate, 9 parts by weight of phytate, 115 parts by weight of water, 140 parts by weight of flaky brown corundum powder with a particle size of 10 μm, and 0.5 parts by weight of a wetting and leveling agent of specification BYK378;

[0123] First, mix sodium silicate and water, add diluted phytate (phytate: water = 1:0.8) dropwise while stirring, continue stirring at room temperature for 10 minutes, transfer the mixed solution to a dispersion barrel, add flaky brown corundum powder and wetting and leveling agent, disperse at high speed for 20 minutes, vacuum degas, and discharge.

[0124] Example 6

[0125] Water-based inorganic coating components: 50 parts by weight of sodium silicate, 5 parts by weight of phytate, 100 parts by weight of water, 120 parts by weight of flaky brown corundum powder with a particle size of 10 μm, and 0.2 parts by weight of a wetting and leveling agent of BYK378; the preparation method is the same as in Example 1;

[0126] First, mix sodium silicate and water, add diluted phytate (phytate: water = 1:3) dropwise while stirring, continue stirring at room temperature for 10 minutes, transfer the mixed solution to a dispersion barrel, add flaky brown corundum powder and wetting and leveling agent, disperse at high speed for 20 minutes, vacuum degas, and discharge.

[0127] Example 7

[0128] The process is basically the same as Example 1, except that sodium silicate is replaced with an equal amount of potassium silicate.

[0129] Example 8

[0130] The method is basically the same as Example 1, except that the polyol phosphate is replaced with 5 parts by weight of pentaerythritol phosphate.

[0131] Comparative Example 1

[0132] The process is basically the same as Example 1, except that 8 parts by weight of phytate is omitted.

[0133] Comparative Example 2

[0134] The process is basically the same as Example 1, except that the flaky corundum powder is replaced with aluminum oxide powder of equal mass.

[0135] Comparative Example 3

[0136] The method is basically the same as Example 1, except that the corundum powder is replaced with mica powder of equal mass.

[0137] Comparative Example 4

[0138] The method is basically the same as Example 1, except that the corundum powder is replaced with corundum of equal mass.

[0139] Comparative Example 5

[0140] The process is basically the same as Example 1, except that sodium silicate is replaced with talc of equal mass.

[0141] Comparative Example 6

[0142] The method is basically the same as Example 1, except that sodium silicate is replaced with an equal mass of aluminum silicate.

[0143] Comparative Example 7

[0144] The method is basically the same as Example 1, except that the flaky corundum powder is replaced with columnar corundum powder of equal mass.

[0145] Comparative Example 8

[0146] It is basically the same as Example 1, except that the components of the water-based inorganic coating are as follows: 56 parts by weight of sodium silicate, 58 parts by weight of inositol hexaphosphate, 115 parts by weight of water, 65 parts by weight of flaky brown corundum powder with a particle size of 10 μm, 15 parts by weight of zinc powder with a particle size of 50 nm, and 0.3 parts by weight of a wetting and leveling agent of specification BYK378.

[0147] The main components of the water-based inorganic coatings of the embodiments and comparative examples are shown in Table 1.

[0148] Table 1

[0149]

[0150]

[0151] Preparation of inorganic coating samples:

[0152] The substrate is a stainless steel plate, the surface of the stainless steel plate is shot blasted, and the workpiece is cleaned with compressed air; then the water-based inorganic coatings prepared in each embodiment and comparative example are sprayed respectively, kept warm at 80°C for 20 minutes to cure, and placed at room temperature for 72 hours to obtain samples A1 to A14 containing inorganic coatings.

[0153] After testing, the thickness of inorganic coatings A1 to A14 are all between 20μm and 30μm, namely 24μm, 25μm, 26μm, 25μm, 26μm, 28μm, 24μm, 25μm, 25μm, 26μm, 27μm, 26μm, 28μm, 26μm, and 27μm.

[0154] The following is the performance test of inorganic coating.

[0155] 1) Initial Performance: Samples A1 to A14 containing inorganic coatings formed from the above-mentioned water-based inorganic coatings of the embodiments and comparative examples were directly subjected to a neutral salt spray test (performed in accordance with GB / T 1771-2007), an adhesion test (performed in accordance with GB / T 9286), an impact resistance test (performed in accordance with GB / T 1732), and a hardness test (performed in accordance with GB / T 6739).

[0156] 2) High-temperature resistance testing of the above-mentioned inorganic coatings: Samples A1-A14 were placed in a muffle furnace at 800°C for 3 hours to obtain treated samples B1-B14. The treated samples B1-B14 were subjected to an adhesion test and a neutral salt spray test (performed in accordance with GB / T 1771-2007). The inorganic coatings of the treated samples B1-B14 were observed for cracking, rusting, discoloration, and shedding, and the adhesion and effective anti-corrosion time were recorded.

[0157] The inorganic coating of sample A1 is as follows Figure 1 As shown, the inorganic coating of sample B2 is as Figure 2 As shown. Figures 1-2 It can be seen that the coating surface is in good condition after the 800℃ high temperature test, and there is no obvious difference in appearance compared with before the high temperature test. The other test results are shown in Table 2.

[0158] Table 2

[0159]

[0160]

[0161] As can be seen from Table 2, compared with the comparative example, the water-based inorganic coatings of the embodiments still have high adhesion and good neutral salt spray resistance after being placed at 800°C for 3 hours; among them, the high temperature resistance of Examples 1 and 2 is better than that of other examples.

[0162] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0163] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A water-based inorganic coating, characterized in that: Calculated by mass, it includes the following components: The particle size of the flaky corundum powder is 5 μm to 15 μm; the mass ratio of the flaky corundum powder to the polyol phosphate is (14 to 20):

1.

2. The water-based inorganic coating according to claim 1, wherein The main component of the flaky corundum powder is α-aluminum oxide.

3. The water-based inorganic coating according to claim 1, wherein The water-soluble silicate includes at least one of sodium silicate, potassium silicate and lithium silicate.

4. The water-based inorganic coating according to claim 1, wherein The polyol phosphate includes at least one of inositol hexaphosphate, pentaerythritol phosphate and aminotrimethylenephosphonic acid.

5. The water-based inorganic coating according to any one of claims 1 to 4, characterized in that: Calculated by weight in the water-based inorganic coating, the water-based inorganic coating further comprises: 0.2 to 0.5 parts of a wetting and leveling agent.

6. The water-based inorganic coating according to claim 5, wherein The wetting and leveling agent includes at least one of BYK378, HT-4000 and Tego Wet 70.

7. The water-based inorganic coating according to any one of claims 1 to 4 and 6, characterized in that: Calculated by weight in the water-based inorganic coating, the water-based inorganic coating further comprises: 10 to 18 parts of metal powder.

8. The water-based inorganic coating according to claim 7, wherein The mass ratio of the metal powder to the flaky corundum powder is (0.1-0.15):

1.

9. The water-based inorganic coating according to claim 7, wherein In the water-based inorganic coating, the particle size of the metal powder is 1 nm to 100 nm.

10. The water-based inorganic coating according to claim 7, wherein The metal powder includes at least one of zinc powder and aluminum powder.

11. An inorganic coating, characterized in that The invention is obtained by curing the water-based inorganic coating according to any one of claims 1 to 10.

12. A method for preparing an inorganic coating, characterized in that: The steps include: The water-based inorganic coating according to any one of claims 1 to 10 is applied on a substrate and cured to form the inorganic coating.

13. The preparation method according to claim 12, wherein The curing temperature is 21°C to 90°C.

14. A component comprising an inorganic coating, characterized in that The invention comprises a substrate and the inorganic coating as claimed in claim 11 disposed on the surface of the substrate.

15. The assembly according to claim 14, wherein The substrate includes a metal substrate.

16. An automobile, characterized in that: Comprising an assembly as claimed in claim 14 or 15.

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