A coating and its preparation method and application, and coated product

Abstract

The present invention discloses a coating, a preparation method and application thereof, and a coated product, and belongs to the technical field of polymer materials. The raw material components of the coating provided by the present invention include: an amount of 30 to 100 parts of epoxy resin, an amount of 1 to 100 parts of curing agent, and an amount of 0.3 to 10 parts of phthalocyanine compound; the phthalocyanine compound includes copper phthalocyanine, iron phthalocyanine, and cobalt phthalocyanine. The present invention improves the epoxy resin with a specific combination of phthalocyanine compounds, significantly enhancing the corrosion resistance, high temperature resistance, and wet heat stability of the epoxy resin coating, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a coating, a preparation method and application thereof, and a coated product. Background Art

[0002] Epoxy resin is an important thermosetting resin with good comprehensive properties, including excellent mechanical properties, electrical insulation properties, chemical resistance and adhesion, which also makes it widely used in coatings, adhesives, electronic device packaging, aerospace, microelectronic materials and other fields.

[0003] In the related art, taking bisphenol A epoxy resin as an example, since its cross-linked network structure contains hydroxyl groups that are easily absorbent and has a low cross-linking density, the coating prepared from bisphenol A epoxy resin cannot be used in extremely harsh environments such as high humidity and heat and corrosion resistance.

[0004] Therefore, how to provide a coating material with good corrosion resistance, high humidity and heat resistance, and strong adhesion has become an urgent problem to be solved. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first aspect of the present invention provides a coating having strong bonding force, good corrosion resistance, high temperature resistance and good moisture and heat resistance stability.

[0006] A second aspect of the present invention provides a method for preparing a coating.

[0007] A third aspect of the present invention provides an application of a coating.

[0008] A fourth aspect of the present invention provides an anti-corrosion coating.

[0009] A fifth aspect of the present invention provides a coated product.

[0010] A sixth aspect of the present invention provides a household appliance.

[0011] A seventh aspect of the present invention provides an application of a paint or an anti-corrosion coating in a hot and humid environment or an acidic and alkaline environment.

[0012] According to the first aspect of the present invention, an embodiment provides a coating, wherein the raw material components of the coating include, by weight: 30 to 100 parts of epoxy resin, 1 to 100 parts of curing agent, and 0.3 to 10 parts of phthalocyanine compound;

[0013] The phthalocyanine compounds include copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine.

[0014] The coating according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The present invention improves the epoxy resin with a specific combination of phthalocyanine compounds, significantly enhancing the corrosion resistance, high temperature resistance and wet heat stability of the epoxy resin coating, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0016] Furthermore, the present invention utilizes copper phthalocyanine to improve the corrosion resistance of the coating and prevent oxidation of the metal surface; iron phthalocyanine enhances the antioxidant and acid-base corrosion resistance and adapts to extreme pH environments; cobalt phthalocyanine enhances heat resistance and ensures the stability of the coating at high temperatures. Finally, the present invention utilizes the above-mentioned phthalocyanine compounds to modify the epoxy resin coating, which can significantly improve the corrosion resistance, bonding performance and high temperature resistance of the coating, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid-base corrosion, etc.

[0017] According to some embodiments of the present invention, the raw material components of the coating include: 50 to 80 parts of epoxy resin, 16 to 40 parts of curing agent and 1 to 6 parts of phthalocyanine compound.

[0018] According to some embodiments of the present invention, the mass ratio of copper phthalocyanine, cobalt phthalocyanine and iron phthalocyanine is 1: (1-10): (2-20). Including any ratio and all ranges and any sub-ranges therein. For example, 1:1:2, 1:1:10, 1:1:20, 1:5:10, 1:5:20, 1:10:2, 1:10:10, 1:10:20. Therefore, when the mass ratio of copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine is within the above range, the effects of corrosion resistance and wet heat stability are further enhanced.

[0019] According to some embodiments of the present invention, the curing agent includes an organic amine curing agent, a phenol curing agent and a metal salt curing agent.

[0020] According to some embodiments of the present invention, in the curing agent, the amount of the organic amine curing agent is 10 to 13 parts, the amount of the phenolic curing agent is 5 to 8 parts, and the amount of the metal salt curing agent is 1 to 19 parts. Therefore, the present invention can improve the curing performance and further enhance the heat resistance, rust resistance and flexibility of the coating through the reasonable combination of the organic amine curing agent, the phenolic curing agent and the metal salt curing agent.

[0021] According to some embodiments of the present invention, the organic amine curing agent is selected from at least one of 4,4'-(1,4-phenylenedioxy) diphenylamine, 4,4'-bis(4-aminophenoxy) diphenyl sulfone, 4,4'-bis(3-aminophenoxy) diphenyl sulfone, 4,4'-diaminodiphenyl sulfone or 4,4'-diaminodiphenylmethane. Thus, the organic amine curing agent contains NH bonds, which can react with the epoxy groups of the epoxy resin, such as the reaction of primary amines with epoxy groups to produce secondary amines and hydroxyls, and the epoxy resin coating cured with the organic amine curing agent has high heat resistance.

[0022] According to some embodiments of the present invention, the phenolic curing agent is selected from at least one of cardanol or phenolic resin. Thus, the phenolic curing agent contains a phenol group, and its phenolic hydroxyl group reacts with the epoxy group to produce an ether bond and a hydroxyl group. The epoxy resin coating cured by the phenolic curing agent has a low processing temperature and good flexibility.

[0023] According to some embodiments of the present invention, the metal salt curing agent is selected from dithiophosphoric acid-O,O-di-C 1-14 -Alkyl ester zinc salt. Thus, the anti-rust performance of epoxy coating can be enhanced.

[0024] According to some embodiments of the present invention, the epoxy resin includes but is not limited to bisphenol A epoxy resin.

[0025] According to some embodiments of the present invention, the bisphenol A epoxy resin is selected from at least one of E51 epoxy resin, E44 epoxy resin, E20 epoxy resin or E12 epoxy resin, but is not limited thereto, and may also be selected from common models in the art.

[0026] A second aspect of the present invention provides a method for preparing a coating, comprising the following steps:

[0027] The coating is obtained by mixing the epoxy resin, curing agent and phthalocyanine compound, heating and curing, and then crushing.

[0028] The method for preparing the coating according to the embodiment of the present invention has at least the following beneficial effects:

[0029] The preparation method of the invention has simple process, easy operation, high production efficiency and is suitable for large-scale production application.

[0030] According to some embodiments of the present invention, the heating and curing process is: heating to 30-100° C. and curing for 15-60 min.

[0031] According to some embodiments of the present invention, the heating curing process is gradient temperature rise curing, which includes two stages: heating to 30-80° C. for curing for 10-30 min, and then heating to 80-100° C. for curing for 10-30 min.

[0032] According to some embodiments of the present invention, the heating curing process is gradient temperature rise curing, which includes two stages: heating to 30-80° C. for curing for 10 min, and then heating to 80-100° C. for curing for 10 min.

[0033] According to some embodiments of the present invention, the crushing step is as follows:

[0034] The solidified product was crushed using an ACM mill.

[0035] The third aspect of the present invention provides an application of the coating described in the first aspect of the present invention or the coating prepared by the preparation method described in the second aspect of the present invention in coating a metal substrate.

[0036] The application of the embodiments of the present invention has at least the following beneficial effects:

[0037] The coating obtained by the present invention has the characteristics of high heat resistance, easy processing and high adhesion. When applied to metal substrate coating, the formed coating has high density, strong anti-penetration and high heat resistance, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0038] The fourth aspect of the present invention provides an anti-corrosion coating, and the raw materials for preparing the anti-corrosion coating include the coating described in the first aspect of the embodiment of the present invention.

[0039] The anti-corrosion coating according to the embodiment of the present invention has at least the following beneficial effects:

[0040] The anticorrosive coating provided by the present invention is obtained by coating the aforementioned coating, and therefore also has the technical effects of the coating described above. The present invention applies the aforementioned coating to a metal substrate, and the formed coating has high density, strong anti-permeability, and high heat resistance, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0041] According to some embodiments of the present invention, the anti-corrosion coating may be applied by conventional methods in the art, which are not limited here, such as scraping, spin coating or spray coating.

[0042] According to some embodiments of the present invention, the thickness of the anti-corrosion coating is 100-500 μm. Including any numerical value and all ranges and any sub-ranges therein. For example, including 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 400 μm and 500 μm. Therefore, when the thickness of the anti-corrosion coating is within the above range, it has a good protective effect and is not easy to fall off.

[0043] The fifth aspect of the present invention provides a coated product, comprising a metal substrate and a coating located on the surface of the metal substrate; the coating is the anti-corrosion coating described in the fourth aspect of the present invention.

[0044] According to some embodiments of the present invention, the metal substrate includes a single metal or a metal alloy, such as tinplate, titanium alloy, stainless steel, etc.

[0045] The sixth aspect of the present invention provides a household appliance product, comprising the coating described in the first aspect of the embodiment of the present invention; or the anti-corrosion coating described in the fourth aspect of the embodiment of the present invention.

[0046] According to some embodiments of the present invention, the household appliances include water heaters (such as air-energy water heaters, solar water heaters, electric water heaters, gas water heaters, etc.), refrigeration appliances (such as household refrigerators, cold drink machines, etc.), air conditioners (such as room air conditioners, electric fans, ventilation fans, hot and cold air blowers, air dehumidifiers, cold air blowers, humidifiers, etc.), cleaning appliances (such as washing machines, dryers, electric irons, vacuum cleaners, floor waxers, sweeping robots, etc.), kitchen appliances (such as electric stoves, microwave ovens, induction cookers, electric ovens, rice cookers, dishwashers, food processors, etc.), electric heating appliances (such as space heaters), audio and video appliances (such as micro projectors, televisions, radios, tape recorders, video recorders, cameras, combination audio systems, etc.).

[0047] A seventh aspect of the present invention provides the use of the above-mentioned coating or the above-mentioned anti-corrosion coating in a hot and humid environment or an acid-base environment.

[0048] According to some embodiments of the present invention, the hot and humid environment refers to an environment temperature higher than 35° C. and an environment relative humidity higher than 70%.

[0049] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0051] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does 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.

[0052] In some embodiments of the present invention, a coating is provided, wherein the raw material components of the coating include, by weight: 30 to 100 parts of epoxy resin, 1 to 100 parts of curing agent, and 0.3 to 10 parts of phthalocyanine compound;

[0053] The phthalocyanine compounds include copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine.

[0054] It can be understood that the present invention improves the epoxy resin with a specific combination of phthalocyanine compounds, which significantly enhances the corrosion resistance, high temperature resistance and wet heat stability of the epoxy resin coating, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion.

[0055] Furthermore, the present invention utilizes copper phthalocyanine to improve the corrosion resistance of the coating and prevent oxidation of the metal surface; iron phthalocyanine enhances the antioxidant and acid-base corrosion resistance and adapts to extreme pH environments; cobalt phthalocyanine enhances heat resistance and ensures the stability of the coating at high temperatures. Finally, the present invention utilizes the above-mentioned phthalocyanine compounds to modify the epoxy resin coating, which can significantly improve the corrosion resistance, bonding performance and high temperature resistance of the coating, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid-base corrosion, etc.

[0056] In some embodiments of the present invention, the raw material components of the coating include: 50 to 80 parts of epoxy resin, 16 to 40 parts of curing agent and 1 to 6 parts of phthalocyanine compound.

[0057] In some embodiments of the present invention, the mass ratio of copper phthalocyanine, cobalt phthalocyanine and iron phthalocyanine is 1: (1-10): (2-20). Including any ratio and all ranges and any sub-ranges therein. For example, 1:1:2, 1:1:10, 1:1:20, 1:5:10, 1:5:20, 1:10:2, 1:10:10, 1:10:20. Therefore, when the mass ratio of copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine is within the above range, the corrosion resistance and wet heat stability are further improved.

[0058] In some embodiments of the present invention, the curing agent includes an organic amine curing agent, a phenol curing agent and a metal salt curing agent.

[0059] In some embodiments of the present invention, in the curing agent, the amount of the organic amine curing agent is 10 to 13 parts, the amount of the phenolic curing agent is 5 to 8 parts, and the amount of the metal salt curing agent is 1 to 19 parts. Therefore, the present invention can improve the curing performance and further enhance the heat resistance, rust resistance and flexibility of the coating through the reasonable combination of the organic amine curing agent, the phenolic curing agent and the metal salt curing agent.

[0060] In some embodiments of the present invention, the organic amine curing agent is selected from at least one of 4,4'-(1,4-phenylenedioxy) diphenylamine, 4,4'-bis(4-aminophenoxy) diphenyl sulfone, 4,4'-bis(3-aminophenoxy) diphenyl sulfone or 4,4'-diaminodiphenyl sulfone, and 4,4'-diaminodiphenylmethane. Thus, the organic amine curing agent contains NH bonds, which can react with the epoxy groups of the epoxy resin, such as the reaction of primary amines with epoxy groups to produce secondary amines and hydroxyls, and the epoxy resin coating cured with the organic amine curing agent has high heat resistance.

[0061] In some embodiments of the present invention, the phenolic curing agent is selected from at least one of cardanol or phenolic resin. Thus, the phenolic curing agent contains a phenol group, and its phenolic hydroxyl group reacts with the epoxy group to produce an ether bond and a hydroxyl group. The epoxy resin coating cured by the phenolic curing agent has a low processing temperature and good flexibility.

[0062] In some embodiments of the present invention, the metal salt curing agent is selected from dithiophosphoric acid-O,O-di-C 1-14 -Alkyl ester zinc salt. Thus, the anti-rust performance of epoxy coating can be enhanced.

[0063] In some embodiments of the present invention, the epoxy resin includes but is not limited to bisphenol A epoxy resin.

[0064] In some embodiments of the present invention, the bisphenol A epoxy resin is selected from at least one of E51 epoxy resin, E44 epoxy resin, E20 epoxy resin, and E12 epoxy resin, but is not limited thereto, and may also be selected from common types in the art.

[0065] In some embodiments of the present invention, a method for preparing a coating is provided, comprising the following steps:

[0066] The coating is obtained by mixing the epoxy resin, curing agent and phthalocyanine compound, heating and curing, and then crushing.

[0067] It can be understood that the preparation method of the present invention has simple process, easy operation, high production efficiency, and is suitable for large-scale production applications.

[0068] In some embodiments of the present invention, the heating and curing process is: heating to 30-100° C. and curing for 15-60 min.

[0069] In some embodiments of the present invention, the heating curing process is gradient temperature rise curing, which includes two stages: heating to 30-80° C. for curing for 10-30 min, and then heating to 80-100° C. for curing for 10-30 min.

[0070] In some embodiments of the present invention, the heating curing process is gradient temperature rise curing, and the gradient temperature rise curing includes two stages: heating to 30-80° C. for curing for 10 min, and then heating to 80-100° C. for curing for 10 min.

[0071] In some embodiments of the present invention, the crushing step is as follows:

[0072] The solidified product was crushed using an ACM mill.

[0073] In some embodiments of the present invention, there is provided a use of the coating described in the first aspect of the present invention or the coating prepared by the preparation method described in the second aspect of the present invention in coating a metal substrate.

[0074] It can be understood that the coating obtained in the embodiment of the present invention has the characteristics of high heat resistance, easy processing and high adhesion. When it is applied to the coating of metal substrates, the formed coating has high density, strong anti-penetration and high heat resistance; it can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion.

[0075] In some embodiments of the present invention, an anti-corrosion coating is provided, and the raw materials for preparing the anti-corrosion coating include the coating described in the first aspect of the present invention.

[0076] It is understandable that the anti-corrosion coating provided by the embodiment of the present invention is obtained by coating the aforementioned coating, and therefore also has the technical effect of the coating described above. The embodiment of the present invention applies the aforementioned coating to the metal substrate, and the formed coating has high density, strong anti-permeability, and high heat resistance, which can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0077] In some embodiments of the present invention, the anti-corrosion coating may be applied by conventional methods in the art, which are not limited here, such as scraping, spin coating or spray coating.

[0078] In some embodiments of the present invention, the thickness of the anti-corrosion coating is 100-500 μm. Including any numerical value and all ranges and any sub-ranges therein. For example, including 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 400 μm and 500 μm. Therefore, when the thickness of the anti-corrosion coating is within the above range, it has a good protective effect and is not easy to fall off.

[0079] In some embodiments of the present invention, a coated product is provided, comprising a metal substrate and a coating located on the surface of the metal substrate; the coating is the anti-corrosion coating described in the fourth aspect of the present invention.

[0080] It is understandable that the coated product provided by the embodiment of the present invention includes all the technical features of the aforementioned anti-corrosion coating, and therefore also has the technical effects of the aforementioned anti-corrosion coating. The coated product of the present invention has a high coating density, strong permeability resistance, and high heat resistance, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0081] In some embodiments of the present invention, the metal substrate includes a single metal or a metal alloy, such as tinplate, titanium alloy, stainless steel, etc.

[0082] In some embodiments of the present invention, a household appliance product is provided, comprising the coating described in the first aspect of the present invention; or the anti-corrosion coating described in the fourth aspect of the present invention.

[0083] It is understandable that the household appliance provided by the embodiment of the present invention includes all the technical features of the aforementioned coating or anti-corrosion coating, and therefore also has all the technical effects of the aforementioned coating or anti-corrosion coating. The coating of the household appliance of the present invention has high density, strong permeability resistance, and high heat resistance, and can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0084] In some embodiments of the present invention, the household appliances include water heaters (such as air-energy water heaters, solar water heaters, electric water heaters, gas water heaters, etc.), refrigeration appliances (such as household refrigerators, cold drink machines, etc.), air conditioners (such as room air conditioners, electric fans, ventilation fans, hot and cold air blowers, air dehumidifiers, cold air blowers, humidifiers, etc.), cleaning appliances (such as washing machines, dryers, electric irons, vacuum cleaners, floor waxers, sweeping robots, etc.), kitchen appliances (such as electric stoves, microwave ovens, induction cookers, electric ovens, rice cookers, dishwashers, food processors, etc.), electric heating appliances (such as space heaters), audio and video appliances (such as micro projectors, televisions, radios, tape recorders, video recorders, cameras, combination audio systems, etc.).

[0085] In some embodiments of the present invention, there is provided application of the above-mentioned coating or the above-mentioned anti-corrosion coating in a hot and humid environment or an acidic and alkaline environment.

[0086] In some embodiments of the present invention, the hot and humid environment refers to an environment temperature higher than 35° C. and a relative humidity higher than 70%.

[0087] Further, some of the raw materials used in the examples and comparative examples of the present invention are as follows:

[0088] Bisphenol A type epoxy resin: E51 epoxy resin, E20 epoxy resin and E44 epoxy resin were purchased from Shanghai Huayi Resin Co., Ltd.

[0089] Copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine were purchased from Jiangsu Meikailun Chemical Technology Co., Ltd.

[0090] Organic amine curing agents: 4,4'-(1,4-phenylenedioxy) dianiline, 4,4'-bis(4-aminophenoxy) diphenyl sulfone, and 4,4'-diaminodiphenylmethane were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0091] Phenolic curing agent: Cardanol and phenolic resin were purchased from Beijing Bailingwei Technology Co., Ltd.

[0092] Metal salt curing agent: dithiophosphoric acid-O,O-di-C 1-14 -Alkyl ester zinc salt; CAS No. 68649-42-3; commercially available.

[0093] Example 1

[0094] This example provides a coating and an anti-corrosion coating, the amounts of the various raw materials are shown in Table 1, and the preparation method is as follows:

[0095] E51 epoxy resin, curing agent and phthalocyanine compound were mixed and cured at 80°C for 10 min and 100°C for 10 min under an inert atmosphere. The cured prepolymer resin was then crushed using an ACM grinder to obtain a coating.

[0096] Furthermore, an anti-corrosion coating is provided, and the preparation method thereof is as follows:

[0097] The prepared coating was mixed with 30 parts of acetone solvent, 4 parts of BYK9076 dispersant, 0.3 parts of BYK358 leveling agent and 0.05 parts of 6800 defoamer at room temperature to form a slurry, sprayed on tinplate as a metal substrate, and then thermally cured for 15 minutes in an air environment at 230°C to form a final coating. The thickness of the coating was 250 μm.

[0098] Embodiment 2~5

[0099] Examples 2 to 5 provide a series of coatings and anti-corrosion coatings, the raw materials for their preparation are shown in Table 1, and the preparation method is the same as that of Example 1.

[0100] Table 1 Examples 1 to 5 (parts by weight)

[0101]

[0102] Embodiment 6~9

[0103] Examples 6 to 9 provide a series of coatings and anti-corrosion coatings, the raw materials for their preparation are shown in Table 2, and the preparation method is the same as that of Example 1.

[0104] Table 2 Examples 6 to 9 (parts by weight)

[0105]

[0106] Example 10

[0107] This example provides a coating and an anti-corrosion coating, and the raw materials and preparation method thereof are the same as those in Example 1; the difference is that phenolic resin is used instead of cardanol.

[0108] Embodiment 11

[0109] This example provides a coating and an anti-corrosion coating, and the raw materials and preparation method thereof are the same as those in Example 1; the difference is that 4,4'-bis(4-aminophenoxy)diphenyl sulfone is used instead of 4,4'-(1,4-phenylenedioxy)dianiline.

[0110] Comparative Example 1

[0111] This example provides a coating and an anti-corrosion coating, and the raw materials and preparation method thereof are the same as those of Example 1; the difference is that Comparative Example 1 does not contain copper phthalocyanine.

[0112] Comparative Example 2

[0113] This example provides a coating and an anti-corrosion coating, and the raw materials and preparation method thereof are the same as those of Example 1; the difference is that Comparative Example 2 does not contain cobalt phthalocyanine.

[0114] Comparative Example 3

[0115] This example provides a coating and an anti-corrosion coating, and the raw materials and preparation method thereof are the same as those of Example 1; the difference is that Comparative Example 3 does not contain iron phthalocyanine.

[0116] Comparative Example 4

[0117] This example provides a tinplate (Shandong Gangzhong Iron and Steel (Tinplate) Co., Ltd.); no surface treatment is done.

[0118] Comparative Example 5

[0119] An anti-corrosion coating is provided. Tinplate is used as a test sample. The surface is sprayed with Degao electrostatic powder coating (brand number RAL1003). After spraying, it is cured at 230°C for 1 hour. The cured coating thickness is 250 μm.

[0120] Performance Testing

[0121] Pull-out strength test (GB / T 39289-2020; peel strength after bonding of metal and plastic): The pull-out strength of the coating in Examples 1 and 2 of the present invention based on the stainless steel substrate was tested. The pull-out strength of the coating in Example 1 based on the stainless steel substrate was 4.62 MPa, and the pull-out strength of the coating in Example 2 based on the stainless steel substrate was 4.72 MPa, which proves that the coating formed by the coating has the characteristics of high density and strong adhesion.

[0122] Corrosion resistance: The corrosion resistance of the coating was evaluated by a scratch test on Examples 1 to 11 and Comparative Examples 1 to 5. The method is as follows: the prepared coating samples were respectively taken, scratched on the surface, and the scratches on the sample surface were of the same size. Then, the coating samples were placed in a salt spray test box. After 7 days of neutral salt spray test, the surface of the sample was tested. The test standard is GB / T 10125-2021. The results are shown in Table 3.

[0123] High temperature resistance and long-term corrosion resistance test: Examples 1 to 11 and Comparative Examples 1 to 5 were subjected to accelerated tests of high temperature resistance and long-term corrosion resistance, and the method was as follows: coating samples were taken respectively, and after being immersed in 170 ° C hot water at 0.65 MPa in a high temperature autoclave for 2 days, the surface of the samples was observed and the electrochemical impedance was detected (test standard GB / T 39482-2020). The results are shown in Table 3.

[0124] Table 3 Examples 1 to 11 and Comparative Examples 1 to 5

[0125]

[0126] From the experimental data in Table 3, it can be seen that the corrosion resistance of the anti-corrosion coating is evaluated by the cross-scratching experiment. It is found that the surface coating of Examples 1 to 11 of the present invention has no obvious change before and after the experiment. Except for the corrosion of the exposed external substrate, there is no corrosion in other places. However, the surface coating of Comparative Examples 1 to 3 partially falls off or the surface coating shrinkage cavity is serious; the cross-scratching part of Comparative Example 4 is seriously corroded and the corrosion is outwardly derived, and the cross-scratching part of Comparative Example 5 is seriously detached, and the cross-scratching part is seriously corroded and the corrosion is outwardly derived. It shows that the combination of copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine used in the present invention can improve the corrosion resistance of bisphenol A epoxy resin coating.

[0127] Further, for the coatings prepared in Examples 1 to 11 of the present invention and Comparative Examples 1 to 5, except for Comparative Example 4, the initial electrochemical impedance is 10 ^ 12 Ω, after being immersed in 170 ℃ hot water at 0.65 MPa for 2 days in a high temperature autoclave, its surface and resistance were observed. Except for Example 5 of the present invention, the surface coating had no obvious change, and the electrochemical impedance only dropped to 10 ^ 9~10 ^ 10 Ω, while the surface coatings of Comparative Examples 1 to 3 had point-like bubbles, and the electrochemical impedance dropped to 10 ^ 6 Ω; the surface corrosion of Comparative Example 4 is serious, and the surface coating of Comparative Example 5 falls off and has no anti-corrosion effect.

[0128] It is further explained that the coating obtained by modifying bisphenol A epoxy resin with a combination of copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine has good adhesion and corrosion resistance, and still has high stability and corrosion resistance after being boiled in hot water in a high-temperature and high-pressure autoclave for two days. Therefore, the coating provided by the present invention has high temperature resistance and good moisture and heat resistance stability; it can meet the application requirements in extremely harsh environments such as high humidity and heat, acid and alkali corrosion, etc.

[0129] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A coating, characterized in that: The raw material components of the coating include, by weight: 30 to 100 parts of epoxy resin, 1 to 100 parts of curing agent, and 0.3 to 10 parts of phthalocyanine compound; The phthalocyanine compound includes copper phthalocyanine, iron phthalocyanine and cobalt phthalocyanine; the mass ratio of the copper phthalocyanine, cobalt phthalocyanine and iron phthalocyanine is 1:(1-10):(2-20).

2. The coating according to claim 1, characterized in that The raw material components of the coating include, by weight, 50 to 80 parts of epoxy resin, 16 to 40 parts of curing agent and 1 to 6 parts of phthalocyanine compound.

3. The coating according to claim 1 or 2, characterized in that: The curing agent includes organic amine curing agent, phenol curing agent and metal salt curing agent.

4. The coating according to claim 3, characterized in that Among the curing agents, the amount of the organic amine curing agent is 10 parts to 13 parts, the amount of the phenol curing agent is 5 parts to 8 parts, and the amount of the metal salt curing agent is 1 part to 19 parts.

5. The coating according to claim 3, characterized in that The organic amine curing agent is selected from at least one of 4,4'-(1,4-phenylenedioxy) dianiline, 4,4'-bis(4-aminophenoxy) diphenyl sulfone, 4,4'-bis(3-aminophenoxy) diphenyl sulfone, 4,4'-diaminodiphenyl sulfone or 4,4'-diaminodiphenylmethane.

6. The coating according to claim 3, characterized in that The phenolic curing agent is selected from at least one of cardanol and phenolic resin.

7. The coating according to claim 3, characterized in that The metal salt curing agent is selected from dithiophosphoric acid-O,O-di-C 1-14 -Alkyl ester zinc salt.

8. A method for preparing a coating according to any one of claims 1 to 7, characterized in that: The steps include: The coating is obtained by mixing the epoxy resin, curing agent and phthalocyanine compound, heating and curing, and then crushing.

9. The preparation method according to claim 8, characterized in that: The heating and curing process is: heating to 30-100°C and curing for 15-60 minutes.

10. The preparation method according to claim 8 or 9, characterized in that: The heating curing process is a gradient temperature rise curing process, which includes two stages: heating to 30-80°C for curing for 10-30 min, and then heating to 80-100°C for curing for 10-30 min.

11. Use of a coating prepared by the preparation method according to any one of claims 8 to 10 in coating a metal substrate.

12. An anti-corrosion coating, characterized in that: The raw materials for preparing the anti-corrosion coating include the coating according to any one of claims 1 to 7.

13. A coated product, characterized in that: It comprises a metal substrate and a coating located on the surface of the metal substrate; the coating is the anti-corrosion coating according to claim 12.

14. A household appliance, characterized in that: Including the coating according to any one of claims 1 to 7; or the anti-corrosion coating according to claim 12.

15. The household appliance according to claim 14, characterized in that: The household electrical appliances include water heaters, refrigeration appliances, air conditioners, cleaning appliances, kitchen appliances, electric heating appliances or audio-visual appliances.

16. Use of the coating according to any one of claims 1 to 7 or the anti-corrosion coating according to claim 12 in a hot and humid environment or an acid-base environment.

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