Protective coating and method for its production, protective coating and its use and automobile

Abstract

The application relates to a protective coating and a preparation method thereof, a protective coating layer and application of the protective coating to an automobile. The protective coating comprises the following components in parts by mass: 1-5 parts of a metal chelate, 20-30 parts of a binder emulsion, 20-30 parts of pigments, 25-30 parts of fillers, 5-10 parts of a cosolvent and 3-10 parts of a curing agent, and the preparation raw materials of the binder emulsion comprise polycarbonate, epoxy resin and an emulsifier. The protective coating has good wear resistance, good secondary salt fog resistance after a weather resistance test, and good metal surface adhesion, stone impact resistance, solvent resistance, oil resistance, acid resistance and alkali resistance.

Description

Technical Field

[0001] This application relates to the field of materials, and in particular to a protective coating and its preparation method, a protective coating and its application in automobiles. Background Technology

[0002] RVs, also known as "homes on wheels," combine the functions of a "house" and a "vehicle," integrating "clothing, food, shelter, and transportation" into one, realizing a fashionable product of "living while traveling and traveling while living." Off-road RVs are a special category of RVs. Due to their excellent off-road capabilities and relatively comfortable living conditions, they not only meet the needs of off-road enthusiasts for long-distance travel, but more importantly, they adapt to the complex road conditions of various regions, meeting the needs of fieldwork. They are widely used in various industries such as power, communications, petroleum, exploration, and wilderness adventure. Because off-road RVs need to operate in complex environmental conditions, they have high requirements for wear resistance and corrosion resistance, especially for the superstructure. Relevant standards require that after a 1000-hour weathering test, a secondary salt spray test should last for more than 240 hours, and the paint film should show no obvious discoloration, chalking, or loss of gloss after the test. Traditional paints suffer significant degradation in corrosion resistance after weathering tests, failing to meet the requirements for coating off-road RV superstructure systems.

[0003] Therefore, it is necessary to improve traditional technologies. Summary of the Invention

[0004] Based on this, this application provides a protective coating with good secondary corrosion resistance after weathering test, its preparation method, the protective coating and its application in automobiles.

[0005] The technical solution to the above-mentioned technical problems in this application is as follows.

[0006] The first aspect of this application provides a protective coating, comprising the following components by parts by weight:

[0007] The mixture comprises 1-5 parts of a metal chelate, 20-30 parts of an adhesive emulsion, 20-30 parts of a pigment, 25-30 parts of a filler, 5-10 parts of a co-solvent, and 3-10 parts of a curing agent. The raw materials for preparing the adhesive emulsion include polycarbonate, epoxy resin, and emulsifier.

[0008] In some embodiments, the protective coating comprises, by weight, the following components:

[0009] The ingredients are: 1-4 parts metal chelate, 20-28 parts binder emulsion, 20-30 parts pigment, 25-30 parts filler, 5-10 parts co-solvent, and 3-8 parts curing agent.

[0010] In some embodiments, the mass ratio of the binder emulsion to the metal chelate in the protective coating is (6~20):1.

[0011] In some embodiments, in the protective coating, the mass ratio of the polycarbonate, the epoxy resin and the emulsifier in the raw materials for preparing the adhesive emulsion is (5~30):(30~70):(5~10).

[0012] In some embodiments, the adhesive emulsion in the protective coating has a particle size of 14 μm to 24 μm.

[0013] In some embodiments, the emulsifier in the protective coating satisfies at least one of the following characteristics:

[0014] (1) The emulsifier includes at least one of nonionic surfactants and anionic surfactants;

[0015] (2) The emulsifier includes at least one of Span 80 and sodium diisooctyl succinate sulfonate;

[0016] (3) The emulsifier includes Span 80 and sodium diisooctyl succinate sulfonate, wherein the mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is (10~14):(1~2).

[0017] In some embodiments, the protective coating satisfies at least one of the following characteristics:

[0018] (1) The polycarbonate includes bisphenol A type polycarbonate;

[0019] (2) The epoxy resin includes at least one of bisphenol A type epoxy resin and glycidyl ether type epoxy resin;

[0020] (3) The epoxy equivalent of the epoxy resin is 160 g / eq to 200 g / eq;

[0021] (4) The metal chelate includes at least one of bio-based metal chelates, disodium thiotriacetate, tetrasodium ethylenediaminetetraacetate, dithiocarbamate and xanthate chelates.

[0022] In some embodiments, the protective coating satisfies at least one of the following characteristics:

[0023] (1) The pigment includes at least one of modified aluminum tripolyphosphate, carbon black, phthalocyanine blue and phthalocyanine green;

[0024] (2) The filler includes at least one of talc, calcium chloride, hollow glass beads, nickel powder and zinc powder;

[0025] (3) The co-solvent includes at least one of ester solvents and ketone solvents;

[0026] (4) The co-solvent includes at least one of butyl acetate and butanone;

[0027] (5) The co-solvent includes butyl acetate and butanone, wherein the mass ratio of butyl acetate to butanone is (1~3):1;

[0028] (6) The curing agent includes at least one of linoleic acid dimer, tung oil acid dimer, diaminodiphenyl sulfone and tetraethylenepentamine.

[0029] The second aspect of this application provides a method for preparing a protective coating, comprising the following steps:

[0030] The protective coating is prepared by mixing 1-8 parts by weight of metal chelate, 20-30 parts by weight of binder emulsion, 20-30 parts by weight of pigment, 20-30 parts by weight of filler, 5-10 parts by weight of co-solvent and 3-10 parts by weight of curing agent; the raw materials for preparing the binder emulsion include polycarbonate, epoxy resin and emulsifier.

[0031] In some embodiments, the preparation method of the protective coating includes the following steps:

[0032] The polycarbonate, epoxy resin and emulsifier are mixed and emulsified to prepare an adhesive emulsion.

[0033] In some embodiments, in the preparation method of the protective coating, the emulsification treatment is carried out at a temperature of 80°C to 90°C for a time of 40 min to 60 min.

[0034] A third aspect of this application provides a protective coating, which is formed by curing the protective coating prepared by the above-described protective coating material or the protective coating material prepared by the above-described preparation method.

[0035] The fourth aspect of this application provides the application of the above-mentioned protective coating in the preparation of coated articles.

[0036] The fifth aspect of this application provides an automobile that includes the aforementioned protective coating.

[0037] Compared with the prior art, the protective coating of this application has the following beneficial effects:

[0038] The protective coating of this application is prepared by mixing a binder emulsion made from polycarbonate, epoxy resin, and emulsifier with metal chelates, pigments, fillers, and co-solvents in a specific ratio. This results in a protective coating with good abrasion resistance (1000g / 1000r) ≤30mg, and good secondary salt spray resistance after weathering testing, achieving over 480h of salt spray resistance after a 1500h weathering test. Furthermore, the protective coating of this application also exhibits good adhesion to metal surfaces, stone chip resistance, solvent resistance, oil resistance, and acid and alkali resistance. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 The diagram shows the vehicle body of the superstructure system using the heavy-duty protective, highly wear-resistant, and sealing coating protection of Example 1. Detailed Implementation

[0041] Reference will now be made to detailed embodiments of the present invention, one or more of which are described below. Each example is provided for explanation and not for limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from its scope or spirit. For example, features described or illustrated as part of one embodiment may be used in another embodiment to produce further embodiments.

[0042] Therefore, this invention is intended to cover such modifications and variations falling within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the invention are disclosed in or will be apparent from the following detailed description. It will be understood by those skilled in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0044] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element preceded by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The indefinite articles “a” and “an” preceding an element or component of the invention are not restrictive in terms of the number of elements or components (i.e., the number of times they appear). Therefore, “an” or “an” should be interpreted as including one or at least one, and singular elements or components also include plural forms, unless the quantity clearly refers only to the singular. “A plurality” means at least two, such as two, three, etc., unless otherwise expressly specified.

[0045] The weights of the relevant components mentioned in the embodiments of this invention can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this invention is within the scope disclosed in the embodiments of this invention. Specifically, the weights mentioned in the embodiments of this invention can be well-known units of mass in the chemical industry, such as μg, mg, g, and kg.

[0046] Unless otherwise shown or indicated in the operational embodiments, all figures used to represent the amounts, physicochemical properties, etc., of ingredients in the specification and claims are to be understood to be adjusted by the term "about" in all cases. For example, therefore, unless stated to the contrary, the numerical parameters listed in the foregoing specification and appended claims are approximations, and those skilled in the art can appropriately modify these approximations to obtain the desired characteristics by utilizing the teachings disclosed herein. The use of numerical ranges indicated by endpoints includes all numbers within that range and any range within that range; for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, etc.

[0047] One embodiment of this application provides a protective coating, comprising the following components by weight:

[0048] The ingredients include 1-5 parts of metal chelate, 20-30 parts of binder emulsion, 20-30 parts of pigment, 25-30 parts of filler, 5-10 parts of co-solvent, and 3-10 parts of curing agent. The raw materials for preparing the binder emulsion include polycarbonate, epoxy resin, and emulsifier.

[0049] The protective coating of this application uses a binder emulsion prepared from polycarbonate, epoxy resin, and emulsifier as raw materials. An ester exchange reaction occurs between the polycarbonate and epoxy resin. The coating is then combined with metal chelates, pigments, fillers, and co-solvents in a specific ratio to achieve good abrasion resistance (1000g / 1000r) ≤30mg. Furthermore, it exhibits good secondary salt spray resistance after weathering testing, achieving over 480 hours of salt spray resistance after a 1500-hour weathering test. Simultaneously, the protective coating of this application also possesses good adhesion to metal surfaces, stone chip resistance, solvent resistance, oil resistance, acid and alkali resistance, and good sealing properties.

[0050] It is understandable that the secondary salt spray resistance performance after weathering test refers to the product undergoing weathering test first, and then the product undergoing weathering test is tested for salt spray resistance performance; this can simulate the situation of off-road RVs being used under natural climatic conditions such as sunlight, humidity, rain, dew, wind, and frost, and then being used in high salt spray scenarios such as the seaside.

[0051] It is understood that, by mass percentage, the protective coating may contain, but is not limited to, 1, 2, 3, 4, or 5 parts of metal chelates; 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts of binder emulsions; 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts of pigments; 25, 26, 27, 28, 29, or 30 parts of fillers; 5, 6, 7, 8, 9, or 10 parts of co-solvents; and 3, 4, 5, 6, 7, 8, 9, or 10 parts of curing agents. In some examples, any two of these point values ​​may be used as endpoints within a range, and the same applies below.

[0052] In some of these examples, the protective coating comprises, by parts by weight, the following components:

[0053] The ingredients are: 1-4 parts metal chelate, 20-28 parts binder emulsion, 20-30 parts pigment, 25-30 parts filler, 5-10 parts co-solvent, and 3-8 parts curing agent.

[0054] In some of these examples, the protective coating comprises, by parts by weight, the following components:

[0055] The ingredients are: 2-4 parts metal chelate, 24-28 parts binder emulsion, 20-25 parts pigment, 25-30 parts filler, 5-10 parts co-solvent, and 5-8 parts curing agent.

[0056] In some of these examples, the mass ratio of binder emulsion to metal chelate in the protective coating is (6~20):1.

[0057] It is understood that the mass ratio of the binder emulsion to the metal chelate is, but is not limited to, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, and 20:1.

[0058] In some of these examples, the mass ratio of binder emulsion to metal chelate in the protective coating is (7~20):1.

[0059] In some of these examples, the mass ratio of binder emulsion to metal chelate in the protective coating is (7~10):1.

[0060] Studies have found that if the amount of metal chelate used is too small, the compound film on the metal surface will be incomplete, resulting in poor weather resistance and corrosion resistance; while if the amount used is too large, it will affect the film formation of the coating and affect the storage stability of the coating.

[0061] In some of these examples, in the preparation of the binder emulsion in the protective coating, the mass ratio of polycarbonate, epoxy resin and emulsifier is (5~30):(30~70):(5~10).

[0062] It can be understood that in the raw materials for preparing the adhesive emulsion, the mass ratio of polycarbonate to epoxy resin is (5~30):(30~70), that is, the mass ratio of polycarbonate to epoxy resin is 1:(1~14); the mass ratio of the total mass of polycarbonate and epoxy resin to the mass of emulsifier is (35~100):(5~10), that is, the mass ratio of the total mass of polycarbonate and epoxy resin to the mass of emulsifier is (3.5~20):1. Further, it can be understood that the mass ratio of polycarbonate to epoxy resin includes, but is not limited to, 1:1, 1:2, 1:5, 1:8, 1:10, 12:1, and 14:1; the mass ratio of the total mass of polycarbonate and epoxy resin to the mass of emulsifier includes, but is not limited to, 3.5:1, 5:1, 8:1, 10:1, 12:1, 15:1, 18:1, and 20:1.

[0063] Optionally, the mass ratio of polycarbonate, epoxy resin and emulsifier is (5~15):(50~70):(6~9).

[0064] Furthermore, the mass ratio of polycarbonate, epoxy resin and emulsifier is (5~10):(60~70):(6~7).

[0065] Specifically, the mass ratio of polycarbonate, epoxy resin and emulsifier is 15:50:8.

[0066] Specifically, the mass ratio of polycarbonate, epoxy resin and emulsifier is 8:70:6.

[0067] It can also be understood that, by mass percentage, the raw materials for preparing the adhesive emulsion contain 5-30 parts of polycarbonate, 30-70 parts of epoxy resin, and 5-10 parts of emulsifier; further, it can be understood that the mass percentages of polycarbonate include, but are not limited to, 5, 6, 7, 8, 10, 12, 15, 18, 20, 22, 25, 28, and 30 parts; the mass percentages of epoxy resin include, but are not limited to, 30, 35, 40, 45, 50, 55, 60, 65, and 70 parts; and the mass percentages of emulsifier include, but are not limited to, 5, 6, 7, 8, 9, and 10 parts.

[0068] In some examples, the raw materials for preparing the adhesive emulsion in the protective coating also include water. Further, the mass ratio of polycarbonate to water is (5~30):(2-6).

[0069] In some of these examples, the binder emulsion in the protective coating has a particle size of 14 μm to 24 μm.

[0070] It is understood that the particle size of the binder emulsion includes, but is not limited to, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 20 μm, 21 μm, 22 μm, and 24 μm.

[0071] By further controlling the particle size of the binder emulsion, the dispersion stability of the binder emulsion can be further improved, making it easier to form a continuous and smooth paint film with good storage stability, thereby further improving the abrasion resistance and secondary salt spray resistance of the protective coating.

[0072] In some of these examples, the emulsifier in the protective coating includes at least one of a nonionic surfactant and anionic surfactant.

[0073] In some of these examples, the emulsifier in the protective coating includes a complex of nonionic and anionic surfactants, or a mixture of nonionic and anionic surfactants.

[0074] In some of these examples, the emulsifier in the protective coating includes at least one of Span 80 (SP-80) and sodium diisooctyl succinate sulfonate.

[0075] In some of these examples, the emulsifiers in the protective coatings include Span 80 and sodium diisooctyl succinate sulfonate.

[0076] Using this specific type of composite emulsifier can further improve the dispersion stability of the binder emulsion, making it easier to form a continuous and smooth paint film with good storage stability, thereby further improving the abrasion resistance and secondary salt spray resistance of the protective coating.

[0077] Furthermore, the mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is (10~14):(1~2).

[0078] Optionally, the mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is 14:2.

[0079] In some of these examples, the polycarbonate in the protective coating includes bisphenol A type polycarbonate.

[0080] In some of these examples, the epoxy resin in the protective coating includes at least one of bisphenol A type epoxy resin and glycidyl ether type epoxy resin.

[0081] Furthermore, the epoxy resins include, but are not limited to, at least one of E51, E44, E6101, etc.

[0082] In some of these examples, the epoxy equivalent of the epoxy resin in the protective coating is 160 g / eq to 200 g / eq.

[0083] It can be understood that epoxy equivalent refers to the mass in grams of epoxy resin containing 1g of equivalent epoxy groups. Furthermore, the epoxy equivalent of epoxy resin includes, but is not limited to, 160 g / eq, 165 g / eq, 170 g / eq, 175 g / eq, 180 g / eq, 185 g / eq, 190 g / eq, 195 g / eq, and 200 g / eq.

[0084] In some of these examples, the epoxy equivalent of the epoxy resin in the protective coating is 175 g / eq to 200 g / eq.

[0085] Metal chelates are formed by the strong binding of chelating agent molecules with metal ions, encapsulating the metal ions within the chelating agent and transforming them into stable compounds with larger molecular weights.

[0086] In some of these examples, the metal chelate in the protective coating includes at least one of bio-based metal chelates, disodium thiotriacetate, tetrasodium ethylenediaminetetraacetate, dithiocarbamate, and xanthate chelates.

[0087] Among them, bio-based metal chelates include, but are not limited to, maltodextrin-based substances.

[0088] In some of these examples, the pigments in the protective coatings include, but are not limited to, at least one of weather-resistant pigments and corrosion-resistant pigments.

[0089] In some of these examples, the pigments in the protective coatings include at least one of modified aluminum tripolyphosphate, carbon black, phthalocyanine blue, and phthalocyanine green.

[0090] In some of these examples, the filler in the protective coating includes at least one of talc, calcium chloride, hollow glass beads, nickel powder, and zinc powder.

[0091] In some of these examples, the co-solvent in the protective coating includes at least one of ester solvents and ketone solvents.

[0092] In some of these examples, the co-solvent in the protective coating includes at least one of butyl acetate and butanone.

[0093] In some of these examples, the co-solvent in the protective coating includes a mixture of butyl acetate and butanone.

[0094] Using this specific type of composite solvent can further improve the dispersion stability of the binder emulsion, making it easier to form a continuous and smooth paint film with good storage stability, thereby further improving the abrasion resistance and secondary salt spray resistance of the protective coating.

[0095] Furthermore, the mass ratio of butyl acetate to butanone is (1~3):1.

[0096] It is understood that the mass ratio of butyl acetate to butanone includes, but is not limited to, 1:1, 1.5:1, 2:1, 2.5:1, and 3:1.

[0097] Optionally, the mass ratio of butyl acetate to butanone is 1.5:1.

[0098] In some of these examples, the curing agent in the protective coating includes at least one of linoleic acid dimer, tung oil acid dimer, diaminodiphenyl sulfone, and tetraethylenepentamine.

[0099] The aforementioned protective coating exhibits an adhesion strength of over 60% on metal surfaces and demonstrates good resistance to ultraviolet radiation, corrosion, and high-temperature environments.

[0100] One embodiment of this application provides a method for preparing a protective coating, comprising the following steps:

[0101] The protective coating is prepared by mixing 1-8 parts by weight of metal chelate, 20-30 parts by weight of binder emulsion, 20-30 parts by weight of pigment, 20-30 parts by weight of filler, 5-10 parts by weight of co-solvent and 3-10 parts by weight of curing agent; the raw materials for preparing binder emulsion include polycarbonate, epoxy resin and emulsifier.

[0102] It is understood that the preparation method of the protective coating provided in this application can produce the above-mentioned protective coating. That is, the protective coating produced by the preparation method of the protective coating provided in this application has good wear resistance, with a wear resistance (1000g1000r) ≤30mg, and good secondary salt spray resistance after weathering test, with its salt spray resistance after 1500h weathering test reaching more than 480h. At the same time, it also has good metal surface adhesion, stone chip resistance, solvent resistance, oil resistance, acid and alkali resistance.

[0103] In some examples, the preparation method of the adhesive emulsion in the preparation method of the protective coating includes the following steps:

[0104] An adhesive emulsion is prepared by mixing polycarbonate, epoxy resin and emulsifier and then emulsifying them.

[0105] In some of these examples, the emulsification process in the preparation of the protective coating includes mixing and stirring polycarbonate, epoxy resin and emulsifier.

[0106] In some of these examples, the emulsification process for the protective coating is carried out at a temperature of 80°C to 90°C for a time of 40 min to 60 min.

[0107] It is understood that the emulsification temperature includes, but is not limited to, 80℃, 82℃, 85℃, 88℃, and 90℃, and the time includes, but is not limited to, 40 min, 42 min, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min, and 60 min.

[0108] After emulsifying polycarbonate, epoxy resin and emulsifier, the resulting binder emulsion is then combined with metal chelates, pigments, fillers and co-solvents in a specific ratio. This can effectively improve the wear resistance of protective coatings, as well as their secondary salt spray resistance after weathering tests, and also provide good sealing performance.

[0109] One embodiment of this application provides a protective coating, which is formed by curing the protective coating or the protective coating prepared by the above-described preparation method.

[0110] The protective coating provided in this application is formed by curing the above-mentioned protective coating or the protective coating prepared by the above-mentioned preparation method, thereby imparting similar properties to the protective coating.

[0111] One embodiment of this application provides a method for preparing a protective coating, wherein the above-mentioned protective coating or the protective coating prepared by the above-mentioned method is applied to a substrate and then cured to form a protective coating on the surface of the substrate.

[0112] It is understood that this application does not limit the method of applying the protective coating; conventional methods in the field are acceptable, including but not limited to coating.

[0113] In some of these examples, the curing temperature in the preparation method of the protective coating is 120℃~140℃, and the curing time is 0.5 h~2 h.

[0114] In some of these examples, the curing temperature for the protective coating is 120°C, and the curing time is 1 h to 2 h. In other examples, the curing temperature for the protective coating is 140°C, and the curing time is 0.5 h.

[0115] One embodiment of this application provides a protection method, including the following steps:

[0116] The workpiece is cleaned and shot-peened.

[0117] The above-mentioned protective coating is applied to the surface after shot blasting and then cured.

[0118] In some of these examples, compressed air is used to clean the workpiece after shot peening.

[0119] The above-mentioned protective methods can provide long-term corrosion protection for metal surfaces and also have wear-resistant and heat-insulating functions.

[0120] One embodiment of this application provides the application of the above-described protective coating in the preparation of coated articles.

[0121] One embodiment of this application provides a coated article including the above-described protective coating.

[0122] In some embodiments, the coated articles include, but are not limited to, automobiles, wires and cables, railway profiles, and electrodes.

[0123] The coating product contains the above-mentioned protective coating or the protective coating prepared by the above-mentioned method and cured, which can give the coating product good wear resistance, secondary salt spray resistance and good sealing performance, and is especially suitable for the superstructure system of off-road vehicles.

[0124] The present application will be described in further detail below with reference to specific embodiments, but the embodiments of the present application are not limited thereto.

[0125] Unless otherwise specified, all raw materials and instruments used in the following specific embodiments are commercially available.

[0126] Example 1

[0127] This embodiment provides a heavy-duty protective, highly wear-resistant, and sealing coating, the preparation method of which includes the following steps:

[0128] (1) Mix 8 parts by weight of polycarbonate and 70 parts by weight of epoxy resin to obtain a mixed resin; wherein the polycarbonate is bisphenol A type polycarbonate and the epoxy resin is E51; add 6 parts by weight of emulsifier and 4 parts by weight of water to the mixed resin, and stir at 80°C for 60 min to perform emulsification treatment to obtain an adhesive emulsion; wherein the emulsifier is SP-80 and sodium diisooctyl succinate in a mass ratio of 14:2.

[0129] (2) Mix 24 parts by weight of the binder emulsion prepared in step (1), 3 parts by weight of the metal chelate, 20 parts by weight of the pigment, 25 parts by weight of the filler, 10 parts by weight of the co-solvent and 7 parts by weight of the curing agent evenly to obtain a heavy-duty protective and highly wear-resistant sealing coating; wherein, the metal chelate is tetrasodium ethylenediaminetetraacetate, the pigment is carbon black, the filler is nickel powder, and the co-solvent is butyl acetate and butanone in a mass ratio of 3:2.

[0130] Example 2

[0131] This embodiment provides a heavy-duty protective, highly wear-resistant, and sealing coating, the preparation method of which includes the following steps:

[0132] (1) Mix 25 parts by weight of polycarbonate and 40 parts by weight of epoxy resin to obtain a mixed resin; wherein the polycarbonate is bisphenol A type polycarbonate and the epoxy resin is E44; add 10 parts by weight of emulsifier to the mixed resin and stir at 80°C for 60 min to obtain an adhesive emulsion; wherein the emulsifier is SP-80 and sodium diisooctyl succinate in a mass ratio of 14:2.

[0133] (2) Mix 30 parts by weight of the binder emulsion prepared in step (1), 5 parts by weight of the metal chelate, 20 parts by weight of the pigment, 25 parts by weight of the filler, 10 parts by weight of the co-solvent and 9 parts by weight of the curing agent evenly to obtain a heavy-duty protective and highly wear-resistant sealing coating; wherein, the metal chelate is disodium thiotriacetate, the pigment is carbon black, the filler is zinc powder, and the co-solvent is butyl acetate and butanone in a mass ratio of 3:2.

[0134] Example 3

[0135] This embodiment provides a heavy-duty protective, highly wear-resistant, and sealing coating, the preparation method of which includes the following steps:

[0136] (1) Mix 30 parts by weight of polycarbonate and 30 parts by weight of epoxy resin to obtain a mixed resin; wherein the polycarbonate is bisphenol A type polycarbonate and the epoxy resin is E51; add 6 parts by weight of emulsifier to the mixed resin and stir at 80°C for 60 min to obtain an adhesive emulsion; wherein the emulsifier is SP-80 and sodium diisooctyl succinate in a mass ratio of 14:2.

[0137] (2) Mix 20 parts by weight of the binder emulsion prepared in step (1), 1 part by weight of the metal chelate, 20 parts by weight of the pigment, 25 parts by weight of the filler, 10 parts by weight of the co-solvent and 4 parts by weight of the curing agent evenly to obtain a heavy-duty protective and highly wear-resistant sealing coating; wherein, the metal chelate is tetrasodium ethylenediaminetetraacetate, the pigment is phthalocyanine blue, the filler is zinc powder, and the co-solvent is butyl acetate and butanone in a mass ratio of 3:2.

[0138] Example 4

[0139] This embodiment is basically the same as that of embodiment 1, except that in step (2), the amount of adhesive emulsion added is 28 parts and the amount of metal chelate added is 2 parts.

[0140] Example 5

[0141] This embodiment is basically the same as that of embodiment 1, except that in step (2), the amount of adhesive emulsion added is 28 parts and the amount of metal chelate added is 4 parts.

[0142] Example 6

[0143] This embodiment is basically the same as that of embodiment 1, except that in step (1), the weight ratio of polycarbonate, epoxy resin and emulsifier is 15:50:8.

[0144] Example 7

[0145] This embodiment is basically the same as embodiment 1, except that in step (1), the emulsification temperature is 90°C and the time is 40 min.

[0146] Comparative Example 1

[0147] The difference between this comparative example and Example 1 is that no metal chelate was added in step (2).

[0148] Comparative Example 2

[0149] The difference between this comparative example and Example 1 is that: polycarbonate, epoxy resin, emulsifier, 3 parts by weight of metal chelate, 20 parts by weight of pigment, 25 parts by weight of filler, 10 parts by weight of co-solvent, and 7 parts by weight of curing agent are directly mixed and stirred evenly to obtain a heavy-duty protective, highly wear-resistant, and sealing coating; wherein, the total weight of polycarbonate, epoxy resin, and emulsifier is 24 parts, the mass ratio of polycarbonate, epoxy resin, and emulsifier is 8:70:6, the polycarbonate is bisphenol A type polycarbonate, the epoxy resin is E51, the metal chelate is tetrasodium ethylenediaminetetraacetate, the pigment is carbon black, the filler is nickel powder, and the co-solvent is butyl acetate and methyl ethyl ketone in a mass ratio of 3:2.

[0150] Comparative Example 3

[0151] The difference between this comparative example and Example 1 is that in step (1), polycarbonate is omitted, and the amount of epoxy resin is 78 parts by weight.

[0152] Comparative Example 4

[0153] The difference between this comparative example and Example 1 is that in step (1), epoxy resin is omitted, and the polycarbonate is 78 parts by weight.

[0154] Comparative Example 5

[0155] The difference between this comparative example and Example 1 is that in step (1), polycarbonate is replaced with an equal mass of polyacrylate.

[0156] Comparative Example 6

[0157] The difference between this comparative example and Example 1 is that in step (1), polycarbonate is replaced with an equal mass of polyester.

[0158] Comparative Example 7

[0159] The difference between this comparative example and Example 1 is that in step (2), 15 parts by weight of the binder emulsion prepared in step (1), 10 parts by weight of the metal chelate, 20 parts by weight of the pigment, 25 parts by weight of the filler, 10 parts by weight of the co-solvent and 7 parts by weight of the curing agent are mixed and stirred evenly to obtain a heavy-duty protective, high wear-resistant and sealing coating; wherein, the metal chelate is tetrasodium ethylenediaminetetraacetate, the pigment is carbon black, the filler is nickel powder, and the co-solvent is butyl acetate and butanone in a mass ratio of 3:2.

[0160] The components of the protective coatings in each embodiment and comparative example are shown in Table 1.

[0161] Table 1

[0162]

[0163] The coatings prepared in the above embodiments and comparative examples were applied to the coatings as follows:

[0164] The metal workpiece was shot-peened and cleaned using compressed air. The coatings prepared in the above examples and comparative examples were then sprayed onto the workpiece, kept at 120 degrees Celsius for 2 hours, and then cooled to room temperature. After standing at room temperature for 72 hours, the coating thickness was measured to be between 35 µm and 40 µm.

[0165] The above samples were subjected to the following experiments.

[0166] Secondary corrosion resistance test after weathering test:

[0167] Three samples were prepared for each group, and an accelerated weathering test was conducted (accelerated according to GB / T1865-2009). After 1500 hours, the samples were removed and subjected to a neutral salt spray test (according to GB / T 1771-2007). The coating was observed for cracking, rust, discoloration, peeling, etc., and the effective corrosion protection time was recorded.

[0168] Adhesion test: Test according to GB / T 9286-88.

[0169] Stone impact resistance test:

[0170] Step 1: Connect the stone impact tester to the compressed air pipeline or compressed air cylinder. Place the paint sample to be tested with the test surface facing the stone impact tester's stone fragment outlet and secure it to the fixture frame, tightening it securely.

[0171] Step 2: Open the valve of the compressed air duct and adjust the released airflow through the pressure reducing valve to a pressure of 0.2 MPa as shown on the pressure gauge.

[0172] Step 3: Weigh 500 g of angular steel shot and evenly fill the funnel. The steel shot is gathered by the airflow and sprayed onto the testing surface. Then, close the compressed air valve, and the steel shot collects in the collection funnel. Repeat step 3 twice.

[0173] Step 4: Securely adhere a 12-15cm long strip of tape to the damaged surface and press firmly (using a plastic scraper or cam for pressure). Bend the remaining tape upwards. Then, forcefully tear the tape along the vertical direction of the test panel to remove the damaged portion of the paint film from the coating surface.

[0174] Hardness test: according to GB / T 6739-96 (König pendulum) test.

[0175] Abrasion resistance test: Tested according to GB / T 1768-2006.

[0176] Solvent resistance test of coating: At 23℃, use methyl ethyl ketone (MEK) solvent to conduct a 1-hour drop test and observe whether there are any obvious changes in the appearance of the coating.

[0177] Oil resistance test of coating: At 23℃, use passenger car engine oil (SG10W / 30) for a 16-hour drop test and observe whether there are any obvious changes in the appearance of the coating.

[0178] Acid resistance test: At 23℃, a 0.05mol / L sulfuric acid solution was used to conduct a 4-hour drop test, and the appearance of the coating was observed to see if there were any obvious changes.

[0179] Alkali resistance test: At 23℃, a 0.1mol / L sodium hydroxide solution was used to conduct a 4-hour drop test, and the appearance of the coating was observed to see if there were any obvious changes.

[0180] If there is no obvious change in appearance, it is recorded as "qualified"; if there is no obvious change in appearance, it is recorded as "unqualified".

[0181] The experimental test results are shown in Table 2.

[0182] Table 2

[0183]

[0184] As shown in Table 2, compared with the comparative example, the coating prepared in the example has better wear resistance, better secondary salt spray resistance after weathering test, and better adhesion to metal surfaces, stone chip resistance, solvent resistance, oil resistance, acid and alkali resistance. In Comparative Example 1, without the addition of a metal chelate, both its wear resistance and secondary salt spray resistance after weathering tests were significantly reduced. In Comparative Example 2, without first preparing the binder emulsion, polycarbonate, epoxy resin, emulsifier, metal chelate, pigment, filler, co-solvent, and curing agent were directly mixed. The crosslinking effect between polycarbonate and epoxy resin was poor, and the film-forming effect was reduced, resulting in a significant decrease in both its wear resistance and secondary salt spray resistance after weathering tests. In Comparative Example 3, polycarbonate was omitted, and in Comparative Example 4, epoxy resin was omitted, both of which significantly reduced their wear resistance and secondary salt spray resistance after weathering tests. In Comparative Examples 5 and 6, the polycarbonate in Example 1 was replaced with equal masses of polyacrylate and polyester, respectively, resulting in a significant decrease in secondary salt spray resistance after weathering tests. In Comparative Example 7, the ratio of binder emulsion to metal chelate was improper, resulting in poor film-forming properties, a significant decrease in performance, and direct rusting after the first weathering test.

[0185] Off-road vehicle superstructure system practical application test

[0186] The heavy-duty protective, high-wear-resistant, and sealing coating of Example 1, as well as a traditional water-based epoxy coating, were applied to the body of the superstructure system and installed on two off-road vehicles, respectively, for road testing. The body of the superstructure system protected by the heavy-duty protective, high-wear-resistant, and sealing coating of Example 1 was as follows: Figure 1 As shown.

[0187] After 50,000 km, the protective condition of the body coatings on both off-road vehicles was inspected. After the 50,000 km test, the body of the superstructure system with high wear resistance and sealing coating protection in Example 1 showed no obvious discoloration, peeling, or corrosion. The body of the superstructure system treated with traditional protective coatings showed obvious discoloration, local peeling, and corrosion.

[0188] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0189] The embodiments described above are merely illustrative of several implementation methods of this application, intended to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A protective coating, characterized in that, By mass, it includes the following components: The mixture comprises 1-5 parts of a metal chelate, 20-30 parts of an adhesive emulsion, 20-30 parts of a pigment, 25-30 parts of a filler, 5-10 parts of a co-solvent, and 3-10 parts of a curing agent. The raw materials for preparing the adhesive emulsion include polycarbonate, epoxy resin, and emulsifier. The mass ratio of the polycarbonate, epoxy resin, and emulsifier is (5-10):(60-70):(6-7). The polycarbonate includes bisphenol A type polycarbonate. The emulsifier includes Span 80 and sodium diisooctyl succinate sulfonate. The mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is (10-14):(1-2). The co-solvent includes butyl acetate and butanone. The mass ratio of butyl acetate to butanone is (1-3):

1.

2. The protective coating as described in claim 1, characterized in that, By mass, it includes the following components: The ingredients are: 1-4 parts metal chelate, 20-28 parts binder emulsion, 20-30 parts pigment, 25-30 parts filler, 5-10 parts co-solvent, and 3-8 parts curing agent.

3. The protective coating as described in claim 1, characterized in that, The mass ratio of the binder emulsion to the metal chelate is (6~20):

1.

4. The protective coating as described in claim 1, characterized in that, In the raw materials for preparing the adhesive emulsion, the mass ratio of the polycarbonate, the epoxy resin and the emulsifier is 8:70:

6.

5. The protective coating as described in claim 1, characterized in that, The particle size of the binder emulsion is 14 μm to 24 μm.

6. The protective coating as described in claim 1, characterized in that, The mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is 14:

2.

7. The protective coating according to any one of claims 1 to 6, characterized in that, The protective coating satisfies at least one of the following characteristics: (1) The epoxy resin includes glycidyl ether epoxy resin; (2) The epoxy equivalent of the epoxy resin is 160 g / eq to 200 g / eq; (3) The metal chelate includes at least one of bio-based metal chelates, disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, dithiocarbamate and xanthate chelates.

8. The protective coating according to any one of claims 1 to 6, characterized in that, The protective coating satisfies at least one of the following characteristics: (1) The pigment includes at least one of modified aluminum tripolyphosphate, carbon black, phthalocyanine blue and phthalocyanine green; (2) The filler includes at least one of talc, hollow glass beads, nickel powder and zinc powder; (3) The curing agent includes at least one of linoleic acid dimer, tung oil acid dimer, diaminodiphenyl sulfone and tetraethylenepentamine.

9. The protective coating according to any one of claims 1 to 6, characterized in that, The mass ratio of butyl acetate to butanone is (1~2):

1.

10. A method for preparing a protective coating, characterized in that, Includes the following steps: A protective coating is prepared by mixing 1-5 parts by weight of a metal chelate, 20-30 parts by weight of a binder emulsion, 20-30 parts by weight of a pigment, 25-30 parts by weight of a filler, 5-10 parts by weight of a co-solvent, and 3-10 parts by weight of a curing agent. The raw materials for preparing the binder emulsion include polycarbonate, epoxy resin, and emulsifier. The mass ratio of the polycarbonate, epoxy resin, and emulsifier is (5-10):(60-70):(6-7). The polycarbonate includes bisphenol A type polycarbonate. The particle size of the binder emulsion is 14 μm-24 μm. The emulsifier includes Span 80 and sodium diisooctyl succinate sulfonate. The mass ratio of Span 80 to sodium diisooctyl succinate sulfonate is (10-14):(1-2). The co-solvent includes butyl acetate and butanone. The mass ratio of butyl acetate to butanone is (1-3):

1.

11. The preparation method according to claim 10, characterized in that, The method for preparing the adhesive emulsion includes the following steps: The polycarbonate, epoxy resin, emulsifier and water are mixed and emulsified to prepare an adhesive emulsion.

12. The preparation method according to claim 11, characterized in that, The emulsification process is carried out at a temperature of 80℃~90℃ for a time of 40 min~60 min.

13. A protective coating, characterized in that, The protective coating is prepared by curing using the protective coating as described in any one of claims 1 to 9 or the preparation method as described in any one of claims 10 to 12.

14. The application of the protective coating as described in claim 13 in the preparation of coated articles.

15. A car, characterized in that, Includes the protective coating as described in claim 13.

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