Coating composition, preparation method, water-based antistatic coating and application

Abstract

The invention provides a coating composition, a preparation method, a water-based antistatic coating and application, and belongs to the field of coatings. The coating composition is prepared from the following components in parts by weight: 35 to 55 parts of water-based hydroxy acrylic resin, 0.1 to 0.3 part of amine neutralizer, 0.2 to 0.5 part of defoaming agent, 0.5 to 1 part of dispersing agent, 0.1 to 0.8 part of polysilicate magnesium aluminum, 10 to 15 parts of conductive mica powder, 20 to 30 parts of titanium dioxide, 0.5 to 1 part of silane coupling agent, 0.5 to 1 part of graphene, 0.2 to 0.5 part of thickening agent and 8 to 15 parts of solvent. According to the embodiment of the invention, the composition of the coating composition is reasonably designed, so that the adhesive force and the antistatic force of a coating layer formed by the coating on the CFRTP surface are improved at the same time.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a coating composition and a preparation method thereof, a water-based antistatic coating and an application thereof. Background Art

[0002] Continuous fiber reinforced thermoplastic composites (CFRTP) are composed of carbon fiber as reinforcement and thermoplastic resin as matrix. They combine the advantages of high strength, low mass, easy processing, good X-ray transmittance, etc., and are very different from common thermosetting carbon fiber composites (CFRP) in performance. CFRTP is difficult to produce, but in some high-end application fields such as automobiles, aerospace, electronics, etc., due to its excellent performance and customizability, it is gradually receiving more and more attention and application.

[0003] However, the surface tension of CFRTP is relatively small. The low surface tension of CFRTP makes it difficult for paint molecules to form close molecular contact with its surface, which affects the adhesion and makes it difficult for many paints to form effective adhesion on the surface of CFRTP, thus losing the practical value of the paint. At the same time, commonly used polymer materials have a large resistivity, and the surface is prone to static electricity due to friction. When static electricity accumulates to a certain extent, static electricity discharge may occur, causing damage to surrounding electronic equipment, personnel, etc. Therefore, how to simultaneously improve the adhesion and antistatic force of the coating formed by the paint on the surface of CFRTP is a technical problem that urgently needs to be solved. Summary of the invention

[0004] The present application provides a coating composition and a preparation method, a water-based antistatic coating and an application thereof, in order to solve the following technical problem: how to simultaneously improve the adhesion and antistatic force of a coating formed by the coating on a CFRTP surface.

[0005] In the first aspect, an embodiment of the present application provides a coating composition, which includes the following components, in parts by weight: water-based hydroxy acrylic resin: 35 parts to 55 parts, amine neutralizer: 0.1 parts to 0.3 parts, defoamer: 0.2 parts to 0.5 parts, dispersant: 0.5 parts to 1 parts, polymagnesium aluminum silicate: 0.1 parts to 0.8 parts, conductive mica powder: 10 parts to 15 parts, titanium dioxide: 20 parts to 30 parts, silane coupling agent: 0.5 parts to 1 parts, graphene: 0.5 parts to 1 parts, thickener: 0.2 parts to 0.5 parts and solvent: 8 parts to 15 parts.

[0006] Optionally, the amine neutralizer includes: N,N-dimethylethanolamine; and / or,

[0007] The defoaming agent comprises at least one of the following: polydimethylsiloxane and tributyl phosphate; and / or,

[0008] The dispersant comprises: fatty acid polyethylene glycol; and / or,

[0009] The thickener comprises: a hydrophobic group-modified ethoxylated polyurethane polymer.

[0010] Optionally, the water-based hydroxy acrylic resin includes the following raw materials, in parts by weight: bisphenol A epoxy resin: 1 to 20 parts, acrylic acid: 5 to 25 parts, butyl acrylate: 5 to 15 parts, isooctyl acrylate: 5 to 10 parts, methyl methacrylate: 5 to 20 parts, glycidyl methacrylate: 2 to 4 parts, isobornyl methacrylate: 5 to 10 parts, styrene: 5 to 30 parts, benzoyl peroxide: 1 to 10 parts, n-butanol: 15 to 100 parts, ethylene glycol monobutyl ether: 30 to 150 parts, N,N-dimethylethanolamine: 5 to 40 parts, and deionized water: 50 to 200 parts.

[0011] In a second aspect, an embodiment of the present application provides a method for preparing the coating composition according to any one of the embodiments in the first aspect, the method comprising:

[0012] Mixing and grinding water-based hydroxy acrylic resin, solvent, amine neutralizer, dispersant, defoamer, poly magnesium aluminum silicate, conductive mica powder and titanium dioxide to obtain a primary mixed material;

[0013] Mixing the silane coupling agent, graphene, thickener and the primary mixed material to obtain a mixed material;

[0014] The mixed material is filtered to remove impurities to obtain the coating composition.

[0015] Optionally, the fineness of the primary mixed material is ≤30 μm; and / or,

[0016] The viscosity of the coating composition is 600 mPa·S to 1200 mPa·S.

[0017] Optionally, the preparation method of the water-based hydroxylated acrylic resin comprises:

[0018] Mixing bisphenol A epoxy resin, n-butanol and ethylene glycol monobutyl ether to obtain a first mixed solution;

[0019] Mixing acrylic acid, butyl acrylate, isooctyl acrylate, methyl methacrylate, glycidyl methacrylate, isobornyl methacrylate, styrene and benzoyl peroxide to obtain a second mixed solution;

[0020] Under stirring, adding the second mixed liquid dropwise to the first mixed liquid at a set temperature to perform a mixing-polycondensation reaction to obtain a third mixed liquid;

[0021] Using N,N-dimethylethanolamine to adjust the pH value of the third mixed solution to a set pH value to obtain a fourth mixed solution; the set pH value is 7 to 9;

[0022] The fourth mixed liquid is dispersed with deionized water to obtain the water-based hydroxy acrylic resin.

[0023] Optionally, the mixing-polycondensation reaction includes the following parameters: the heat preservation reaction temperature is 110° C. to 130° C., the stirring speed is 300 r / min to 400 r / min, the dropping time is 2.5 h to 4 h, and the heat preservation reaction time is 1.5 h to 8 h.

[0024] In a third aspect, an embodiment of the present application provides a water-based antistatic coating, the water-based antistatic coating comprising:

[0025] The coating composition according to any one of the embodiments of the first aspect; and

[0026] The curing agent composition comprises, by weight, 40 to 60 parts of isocyanate and 40 to 60 parts of propylene glycol diacetate.

[0027] Optionally, the mass ratio of the coating composition to the curing agent composition is (4-6):1.

[0028] In a fourth aspect, an embodiment of the present application provides an application of a water-based antistatic coating, the application comprising:

[0029] The water-based antistatic coating described in the third aspect of the embodiment is disposed on the surface of a substrate to form a coating, wherein the substrate comprises: a continuous fiber reinforced thermoplastic composite material; the adhesion of the coating is ≥7MPa, and the grounding resistance of the coating is <1×10 9 Ω.

[0030] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0031] The present application embodiment provides a coating composition, which includes the following components in parts by weight: water-based hydroxy acrylic resin: 35 to 55 parts, amine neutralizer: 0.1 to 0.3 parts, defoamer: 0.2 to 0.5 parts, dispersant: 0.5 to 1 parts, poly magnesium aluminum silicate: 0.1 to 0.8 parts, conductive mica powder: 10 to 15 parts, titanium dioxide: 20 to 30 parts, silane coupling agent: 0.5 to 1 parts, graphene: 0.5 to 1 parts, thickener: 0.2 to 0.5 parts and solvent: 8 to 15 parts. The present application embodiment rationally designs the composition of the coating composition. By using water-based hydroxy acrylic resin as the main film-forming substance, not only the basic properties of the coating such as hardness, gloss and weather resistance are provided, but also the crosslinking density and intermolecular interaction of the coating are enhanced through the modification of bisphenol A epoxy resin, thereby improving the adhesion of the coating on the surface of continuous fiber reinforced thermoplastic composite (CFRTP); by adding conductive mica powder and graphene, the coating has a lower resistivity, which can quickly conduct away the accumulated static charge and prevent the harm caused by static accumulation; by adding dispersant, the agglomeration and sedimentation of pigments and fillers are effectively prevented, so that the coating remains uniform and stable, which helps to form a smooth and flat coating and improve the quality and aesthetics of the coating; by the combined action of poly magnesium aluminum silicate and thickener, the coating has suitable viscosity and leveling. This helps to form a uniform coating during construction, while improving the adhesion and antistatic properties of the coating. Thereby, the adhesion and antistatic force of the coating formed by the coating on the surface of CFRTP are simultaneously improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 A schematic flow chart of a method for preparing a coating composition provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0037] In addition, in the description of the specification of the present application, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" means one or more, and "plurality" means two or more. "At least one", "the following at least one item (items)" or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple. "Parts" such as parts by weight and parts by weight indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0038] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0039] The present application provides a coating composition, which includes the following components, in parts by weight: 35 to 55 parts of water-based hydroxy acrylic resin, 0.1 to 0.3 parts of amine neutralizer, 0.2 to 0.5 parts of defoamer, 0.5 to 1 parts of dispersant, 0.1 to 0.8 parts of polymagnesium aluminum silicate, 10 to 15 parts of conductive mica powder, 20 to 30 parts of titanium dioxide, 0.5 to 1 parts of silane coupling agent, 0.5 to 1 parts of graphene, 0.5 to 1 parts of thickener, and 8 to 15 parts of solvent.

[0040] In the embodiments of the present application, the components of the coating composition are reasonably designed, and the functions of each component are as follows:

[0041] Waterborne hydroxy acrylic resin (35 to 55 parts): As the main film-forming substance of the coating, it provides the basic properties of the coating, such as hardness, gloss, weather resistance, etc. At the same time, bisphenol A epoxy resin is used for modification, and the rigid structure of the epoxy resin and the flexible structure of the acrylic resin are combined by chemical bonding, which increases the cross-linking density of the resin and the interaction force between molecules, thereby enhancing the adhesion of the coating on the CFRTP surface. Exemplarily, the weight parts of the waterborne hydroxy acrylic resin can be 35 parts, 38 parts, 40 parts, 45 parts, 50 parts, 52 parts, 55 parts, etc.

[0042] Amine neutralizer (0.1 to 0.3 parts): can adjust the pH value of the coating, keep the resin dispersion stable, and prevent the resin from agglomerating or precipitating. At the same time, the amino group in the amine neutralizer reacts with the carboxyl group in the waterborne hydroxy acrylic resin to form a carboxylate, which increases the solubility of the resin in water and reduces the acidity of the system, which is beneficial to the stability and workability of the coating. Exemplarily, the weight portion of the amine neutralizer can be 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, etc.

[0043] Defoamer (0.2 to 0.5 parts): Defoamer molecules have low surface tension and can quickly diffuse to the surface of bubbles, destroy the membrane wall of the bubbles, and cause the bubbles to burst quickly, thereby preventing the generation of bubbles during the stirring and construction of the coating, and ensuring the smoothness and flatness of the coating. For example, the weight of the defoamer can be 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, etc.

[0044] Dispersant (0.5 to 1 part): One end of the dispersant molecule can be adsorbed on the surface of the pigment or filler, and the other end faces the resin. Through the steric hindrance effect and charge repulsion, the pigment and filler are kept dispersed in the resin, improving the uniformity and stability of the coating. This helps the pigment and filler to be evenly dispersed in the resin and prevent agglomeration and sedimentation. Exemplarily, the weight of the dispersant can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, etc.

[0045] Polymeric magnesium aluminum silicate (0.1 to 0.8 parts): As a filler, it increases the solid content of the coating, reduces the cost, and has a certain thickening and thixotropic effect. At the same time, polymeric magnesium aluminum silicate has a layered structure, can absorb resin molecules, form a network structure, improve the consistency and thixotropy of the coating, and is beneficial to the construction and leveling of the coating. Exemplarily, the weight of the polymeric magnesium aluminum silicate can be 0.1 parts, 0.3 parts, 0.5 parts, 0.7 parts, 0.8 parts, etc.

[0046] Conductive mica powder (10 to 15 parts) and graphene (0.5 to 1 part): Conductive mica powder and graphene both have good electrical conductivity. They can form a conductive network in the coating, so that the coating has a lower resistivity. When the coating is grounded, it can quickly conduct away the accumulated static charge to prevent the harm caused by static electricity accumulation, thereby providing the coating with conductive properties and giving the coating antistatic ability. Exemplarily, the weight of the conductive mica powder can be 10 to 15 parts, etc., and the weight of the graphene can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, etc.

[0047] Titanium dioxide (20 to 30 parts): Titanium dioxide has excellent chemical stability and optical properties, and can reflect most of the visible light, making the coating appear white, while improving the hiding power of the coating. Thus, it can be used as a pigment to provide high hiding power and excellent whiteness of the coating. Exemplarily, the weight of the titanium dioxide can be 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0048] Silane coupling agent (0.5 to 1 part): One end of the silane coupling agent can react with functional groups such as hydroxyl and carboxyl on the surface of the substrate, and the other end can react with functional groups such as hydroxyl and carboxyl in the resin molecule, thereby forming a chemical bond between the substrate and the coating and enhancing adhesion. At the same time, the silane coupling agent can also improve the weather resistance and water resistance of the coating and extend the service life of the coating. Thereby, the adhesion between the coating and the substrate can be enhanced, and the weather resistance and water resistance of the coating can be improved. Exemplarily, the weight of the silane coupling agent can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 parts, etc.

[0049] Thickener (0.2 to 0.5 parts): Thickener molecules can form a cross-linked network in the coating or adsorb on the surface of the pigment and filler, increase the viscosity of the coating, enable the coating to form a uniform coating during construction, and improve the leveling of the coating. For example, the weight of the thickener can be 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, etc.

[0050] Solvent (8 to 15 parts): can adjust the viscosity of the coating and help the coating form a uniform coating during construction. Exemplarily, the weight parts of the solvent can be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts.

[0051] At the same time, the synergistic effect between the components is mainly reflected in the following aspects:

[0052] Synergistic effect of resin and amine neutralizer: The carboxyl group in the resin reacts with the amino group in the amine neutralizer to form a stable carboxylate, which makes the resin more evenly dispersed in the water-based system. At the same time, the addition of the amine neutralizer also adjusts the pH value of the coating, which is beneficial to the stability and workability of the coating. This synergistic effect improves the overall performance of the coating.

[0053] Synergistic effect of resin and silane coupling agent: One end of the silane coupling agent reacts with the functional group on the surface of the substrate, and the other end reacts with the functional group in the resin molecule to form a chemical bond. This chemical bonding not only enhances the adhesion between the coating and the substrate, but also improves the weather resistance and water resistance of the coating. At the same time, the silane coupling agent can also promote the cross-linking reaction of the resin molecules and improve the hardness and gloss of the coating.

[0054] Synergistic effect of conductive mica powder, graphene and resin: Conductive mica powder and graphene form a conductive network in the coating and are tightly combined with the resin molecules. This combination not only improves the conductivity of the coating, but also enhances the mechanical strength and wear resistance of the coating. At the same time, the addition of conductive mica powder and graphene can also improve the thermal stability and flame retardant properties of the coating.

[0055] Synergistic effect of dispersants, thickeners and resins: dispersants help pigments and fillers disperse evenly in resins to prevent agglomeration and sedimentation; thickeners increase the viscosity of the coating, improve the construction performance and leveling of the coating. The synergistic effect of the two makes the coating system more stable and the coating quality higher. At the same time, the addition of dispersants and thickeners can also reduce the volatility of the coating and its impact on the environment.

[0056] In some embodiments, the amine neutralizer includes: N,N-dimethylethanolamine; and / or,

[0057] The defoaming agent comprises at least one of the following: polydimethylsiloxane and tributyl phosphate; and / or,

[0058] The dispersant comprises: fatty acid polyethylene glycol; and / or,

[0059] The thickener comprises: a hydrophobic group-modified ethoxylated polyurethane polymer.

[0060] It should be noted that the hydrophobic modified ethoxy polyurethane polymer is an associative polyurethane (PU) thickener, and its molecular structure contains hydrophobic groups, long hydrophilic chains and polyurethane groups. The hydrophobic groups are mostly alkyl groups, which may have aromatic nuclei, and play an associative role, which is the key to the thickening effect. The hydrophilic chains are mostly polyoxyethylene and its derivatives, which provide the chemical stability and viscosity stability of the thickener. Carbamate is used to connect the various parts, and it is easy to synthesize and stable. The models can be Aquaflow NLS200, Aquaflow NLS210, Aquaflow NHS300, etc.

[0061] In some embodiments, the solvent is water or a water analog.

[0062] In some embodiments, the water-based hydroxy acrylic resin includes the following raw materials, in parts by weight: bisphenol A epoxy resin: 1 to 20 parts, acrylic acid: 5 to 25 parts, butyl acrylate: 5 to 15 parts, isooctyl acrylate: 5 to 10 parts, methyl methacrylate: 5 to 20 parts, glycidyl methacrylate: 2 to 4 parts, isobornyl methacrylate: 5 to 10 parts, styrene: 5 to 30 parts, benzoyl peroxide: 1 to 10 parts, n-butanol: 15 to 100 parts, ethylene glycol monobutyl ether: 30 to 150 parts, N,N-dimethylethanolamine: 5 to 40 parts, and deionized water: 50 to 200 parts.

[0063] The present invention reasonably designs the raw material composition of the water-based hydroxy acrylic resin, and the functions of each raw material are as follows:

[0064] Bisphenol A epoxy resin (1 to 20 parts): can provide the skeleton structure of the resin, enhance the adhesion and hardness of the coating, and react with acrylic monomers to form a cross-linked structure to improve the overall performance of the coating. Exemplarily, the weight of the bisphenol A epoxy resin can be 1 part, 3 parts, 5 parts, 7 parts, 10 parts, 15 parts, 20 parts, etc.

[0065] Acrylic acid (5 parts to 25 parts), butyl acrylate (5 parts to 15 parts), isooctyl acrylate (5 parts to 10 parts): Acrylic acid provides carboxyl functional groups for subsequent pH adjustment and dispersion. Butyl acrylate and isooctyl acrylate provide long-chain alkyl groups to improve the flexibility and leveling of the coating. The three together serve as the main acrylic monomers to provide flexibility and weather resistance to the coating. Exemplarily, the weight parts of the acrylic acid can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, etc., the weight parts of butyl acrylate can be 5 parts, 7 parts, 9 parts, 10 parts, 12 parts, 15 parts, etc., and the weight parts of isooctyl acrylate can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0066] Methyl methacrylate (5 to 20 parts), glycidyl methacrylate (2 to 4 parts), isobornyl methacrylate (5 to 10 parts): Methyl methacrylate provides hardness and gloss to the coating. Glycidyl methacrylate provides epoxy functional groups, which can be used in subsequent cross-linking reactions to improve the chemical resistance of the coating. Isobornyl methacrylate provides weather resistance and UV resistance to the coating. Exemplarily, the weight parts of methyl methacrylate can be 5 parts, 7 parts, 9 parts, 12 parts, 15 parts, 20 parts, etc., the weight parts of glycidyl methacrylate can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, etc., and the weight parts of isobornyl methacrylate can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0067] Styrene (5 to 30 parts): copolymerizes with acrylic monomers to improve the hardness and rigidity of the coating. At the same time, the aromatic structure of styrene gives the coating good weather resistance and chemical stability. Exemplarily, the weight of styrene can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, etc.

[0068] Benzoyl peroxide (1 to 10 parts): acts as a free radical initiator to initiate the polymerization reaction of acrylic monomers and bisphenol A epoxy resin. Exemplarily, the weight parts of the benzoyl peroxide can be 1 part, 3 parts, 5 parts, 7 parts, 9 parts, 10 parts, etc.

[0069] n-Butanol (15 to 100 parts), ethylene glycol monobutyl ether (30 to 150 parts): can be used as solvents to dissolve the raw materials and promote the reaction. At the same time, they also act as chain transfer agents to control the molecular weight of the polymer. Exemplarily, the weight parts of n-butanol can be 15 parts, 25 parts, 45 parts, 55 parts, 75 parts, 95 parts, 100 parts, etc., and the weight parts of ethylene glycol monobutyl ether can be 30 parts, 50 parts, 70 parts, 100 parts, 120 parts, 150 parts, etc.

[0070] N,N-dimethylethanolamine (5 to 40 parts): adjusts the pH value of the resin to make it alkaline, which is beneficial to subsequent dispersion and stabilization. For example, the weight of the N,N-dimethylethanolamine can be 5 parts, 10 parts, 20 parts, 30 parts, 35 parts, 40 parts, etc.

[0071] Deionized water (50 to 200 parts): used as a dispersion medium to disperse the resin into a stable emulsion. For example, the weight of the deionized water can be 50 parts, 80 parts, 100 parts, 150 parts, 180 parts, 200 parts, etc.

[0072] In some embodiments, the bisphenol A epoxy resin is E51 epoxy resin.

[0073] Figure 1A schematic flow chart of a method for preparing a coating composition provided in an embodiment of the present application.

[0074] like Figure 1 As shown, the present application provides a method for preparing the coating composition described in any one of the above embodiments, the method comprising:

[0075] S1, mixing and grinding water-based hydroxy acrylic resin, solvent, amine neutralizer, dispersant, defoamer, poly magnesium aluminum silicate, conductive mica powder and titanium dioxide to obtain a primary mixed material;

[0076] S2, mixing the silane coupling agent, graphene, thickener and the primary mixed material to obtain a mixed material;

[0077] S3, filtering the mixture to remove impurities to obtain the coating composition.

[0078] In some embodiments, the fineness of the primary mixed material is ≤30 μm; and / or,

[0079] The viscosity of the coating composition is 600 mPa·S to 1200 mPa·S.

[0080] The fineness requirement of the primary mixed material is limited to ≤30μm, which can ensure that the coating can form a smooth and uniform coating during coating, while improving the adhesion and hiding power of the coating. By filtering the mixed material to remove impurities, impurities and particles in the mixture can be removed to ensure the purity and stability of the coating composition. Viscosity is a measure of the internal resistance of a fluid to flow, also known as the internal friction coefficient. The viscosity of the coating composition is limited to 600mPa·S~1200mPa·S, and the coating has good fluidity, is easy to brush, and can form a uniform coating. Exemplarily, the fineness of the primary mixed material can be 30μm, 29μm, 28μm, 27μm, 26μm, 25μm, etc., and the viscosity of the coating composition can be 600mPa·S, 700mPa·S, 800mPa·S, 900mPa·S, 1000mPa·S, 1100mPa·S, 1200mPa·S, etc.

[0081] In some embodiments, the preparation method of the water-based hydroxylated acrylic resin comprises:

[0082] Mixing bisphenol A epoxy resin, n-butanol and ethylene glycol monobutyl ether to obtain a first mixed solution;

[0083] Mixing acrylic acid, butyl acrylate, isooctyl acrylate, methyl methacrylate, glycidyl methacrylate, isobornyl methacrylate, styrene and benzoyl peroxide to obtain a second mixed solution;

[0084] Under stirring, adding the second mixed liquid dropwise to the first mixed liquid at a set temperature to perform a mixing-polycondensation reaction to obtain a third mixed liquid;

[0085] Using N,N-dimethylethanolamine to adjust the pH value of the third mixed solution to a set pH value to obtain a fourth mixed solution; the set pH value is 7 to 9;

[0086] The fourth mixed liquid is dispersed with deionized water to obtain the water-based hydroxy acrylic resin.

[0087] Mixing-mixing in polycondensation reaction refers to the copolymerization reaction between different monomers. In the embodiment of the present application, acrylic monomers can be connected with monomers such as styrene through free radical polymerization. As the reaction proceeds, different chains may be cross-linked through the interaction of functional groups (such as epoxy groups, carboxyl groups, etc.) to form a three-dimensional network structure. Polycondensation refers to the process of forming a polymer compound through a condensation reaction between monomers containing functional groups. In the embodiment of the present application, the epoxy functional group of bisphenol A epoxy resin and the carboxyl group of acrylic monomers can be connected together through condensation reactions such as esterification. Through the technology of mixed-polycondensation reaction, various functional functional groups are connected together to form a water-based hydroxy acrylic resin with a complex structure and high performance. This resin not only has excellent adhesion and weather resistance, but also has good dispersion stability and construction performance.

[0088] In some embodiments, the mixing-polycondensation reaction includes the following parameters: the insulation reaction temperature is 110°C to 130°C, the stirring speed is 300r / min to 400r / min, the dropping time is 2.5h to 4h, and the insulation reaction time is 1.5h to 8h.

[0089] The temperature of the heat preservation reaction is limited to 110℃~130℃. Within this temperature range, the activity of the monomer and the initiator is moderate, which can ensure that the polymerization reaction proceeds at a reasonable rate, neither too fast to cause violent polymerization nor too slow to affect production efficiency. At the same time, it is conducive to the formation of high molecular weight and uniform structure polymers, while reducing the occurrence of side reactions, such as chain transfer and chain termination, thereby improving the quality and stability of the product. The stirring speed is limited to 300r / min~400r / min, which can ensure that the reaction materials are fully mixed and uniform in the reactor, which is conducive to the effective contact between the monomer and the initiator, and improves the efficiency of the polymerization reaction and the uniformity of the product. The dripping time is limited to 2.5h~4h, which is conducive to the gradual introduction of monomers, so that the polymerization reaction proceeds smoothly, avoiding violent polymerization caused by too fast a reaction rate or inefficiency caused by too slow a reaction rate. The heat preservation reaction time is limited to 1.5h~8h, which helps to ensure that the polymerization reaction proceeds fully, so that the monomers are converted into high molecular polymers as much as possible, and the conversion rate and yield of the product are improved. Exemplarily, the insulation reaction temperature of the mixing-polycondensation reaction can be 110°C, 115°C, 120°C, 125°C, 130°C, etc., the stirring speed can be 300r / min, 320r / min, 340r / min, 360r / min, 380r / min, 400r / min, etc., the dropping time can be 2.5h, 3h, 3.5h, 4h, etc., and the insulation reaction time can be 1.5h, 2h, 3h, 5h, 6h, 7h, 8h, etc.

[0090] In some embodiments, the reaction device for the mixing-polycondensation reaction is a closed reactor.

[0091] In some embodiments, the set temperature is 70°C to 90°C.

[0092] The product prepared by the method for preparing the coating composition is the above-mentioned coating composition. The chemical composition and structure of the coating composition prepared by the method for preparing the coating composition can refer to the above-mentioned embodiment. Since the method for preparing the coating composition adopts part or all of the technical solutions of the coating composition embodiment, it at least has all the beneficial effects brought by the technical solutions of the coating composition embodiment, which will not be described one by one here.

[0093] The preparation method and formulation design of the coating composition have many advantages, which are described in detail as follows:

[0094] (1) Advantages of formula design

[0095] High-performance resin substrate: Water-based hydroxyl acrylic resin is used as the main film-forming substance, and modified by bisphenol A epoxy resin, which increases the crosslinking density of the resin and the interaction between molecules, thereby significantly enhancing the adhesion of the coating on the substrate surface. A variety of acrylic monomers, such as butyl acrylate and isooctyl acrylate, are introduced into the resin, providing excellent flexibility and leveling properties, while ensuring the weather resistance and chemical stability of the coating.

[0096] High-efficiency conductive performance: The addition of conductive mica powder and graphene forms a conductive network in the coating, which significantly improves the conductive performance of the coating, makes it anti-static and effectively prevents the harm caused by static electricity accumulation.

[0097] Excellent pigment dispersion and thickening effect: The selection of high-efficiency dispersants and thickeners ensures the uniform dispersion of pigments and fillers in the resin, prevents agglomeration and sedimentation, and improves the uniformity and stability of the coating.

[0098] The addition of thickeners also increases the viscosity of the coating, enabling it to form a uniform coating during construction and improving the leveling of the coating.

[0099] Environmental protection and sustainability: A large amount of water-based ingredients are used in the formula, which reduces the use of solvents and reduces VOC (volatile organic compound) emissions, meeting environmental protection requirements. The selection of raw materials and the production process also focus on sustainability, reducing the impact on the environment.

[0100] (2) Advantages of the preparation method

[0101] Fine mixing and grinding: By mixing and grinding water-based hydroxy acrylic resin, solvent, amine neutralizer, dispersant, defoamer, polysilicate magnesium aluminum, conductive mica powder and titanium dioxide, a primary mixed material with a fineness of ≤30μm is obtained. This ensures that the paint can form a smooth and uniform coating during painting, and improves the adhesion and hiding power of the paint.

[0102] Efficient reaction process: The use of hybrid-polycondensation reaction technology enables various functional groups to be effectively connected together to form a water-based hydroxyl acrylic resin with complex structure and high performance. This resin not only has excellent adhesion and weather resistance, but also has good dispersion stability and construction performance. At the same time, during the reaction process, the smooth progress of the polymerization reaction and the high quality of the product are ensured by accurately controlling the parameters such as the heat preservation reaction temperature, stirring speed, drop addition time and heat preservation reaction time.

[0103] Purity and stability: By filtering the mixed materials, impurities and particles in the mixture are removed, ensuring the purity and stability of the coating composition. This helps to improve the application performance of the coating and the quality of the final coating.

[0104] Flexibility and scalability: The preparation method can adjust the proportion of each component and reaction conditions according to specific needs to adapt to different application scenarios and performance requirements. This makes it possible to produce customized coatings.

[0105] In summary, the preparation method of the coating composition and its formula design have significant advantages in terms of high performance, environmental protection, sustainability, refinement and high efficiency of the preparation process, etc. These advantages make the coating composition have broad application prospects in multiple fields, such as automobile manufacturing, aerospace, electronic appliances, etc.

[0106] Based on a general inventive concept, the present application provides a water-based antistatic coating, the water-based antistatic coating comprising:

[0107] The coating composition according to any one of the above embodiments; and

[0108] The curing agent composition comprises, by weight, 40 to 60 parts of isocyanate and 40 to 60 parts of propylene glycol diacetate.

[0109] The unsaturated monomers in the coating composition and the active functional groups in the curing agent composition undergo free radical addition polymerization under the action of the initiator. During this reaction, the monomer molecules open double bonds or triple bonds and add to each other to form high molecular polymers. As the addition polymerization proceeds, the monomer molecules gradually transform into high molecular polymers to form a cross-linked structure. These high molecular polymers intertwine and entangle with each other to form a continuous high molecular film.

[0110] Since the coating composition and the curing agent composition will react quickly after being mixed, they must be prepared and used immediately. Avoid long-term storage to prevent curing.

[0111] Isocyanate is known for its excellent cross-linking properties, which can significantly improve the hardness, wear resistance and chemical resistance of the coating. Propylene glycol diacetate not only acts as a solvent, but also has a certain plasticizing effect, which can improve the flexibility and processing properties of the coating. Exemplarily, the weight parts of isocyanate can be 40 parts, 45 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, etc., and the weight parts of propylene glycol diacetate can be 40 parts, 45 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, etc.

[0112] In some embodiments, the mass ratio of the coating composition to the curing agent composition is (4-6):1.

[0113] The mass ratio of the coating composition to the curing agent composition is limited to (4-6):1, ensuring that the two can fully react after mixing to form a coating with excellent performance. Exemplarily, the mass ratio of the coating composition to the curing agent composition can be 4:1, 4.5:1, 5:1, 5.5:1, 6:1, etc.

[0114] Based on a general inventive concept, the present application provides an application of a water-based antistatic coating, the application comprising:

[0115] The water-based antistatic coating described in the above embodiment is disposed on the surface of a substrate to form a coating, wherein the substrate comprises: a continuous fiber reinforced thermoplastic composite material; the adhesion of the coating is ≥7MPa, and the grounding resistance of the coating is <1×10 9 Ω.

[0116] The water-based antistatic coating and its application provided in the embodiments of the present application have many significant advantages. The following is a detailed description of these advantages:

[0117] (1) Excellent antistatic properties

[0118] Static electricity protection: The coating can effectively prevent the generation and accumulation of static electricity, and avoid the harm of static electricity to the surrounding environment, equipment and personnel.

[0119] Low grounding resistance: The grounding resistance of the coating is less than 1×10 9 Ω, ensuring that static electricity can be introduced into the ground in time to ensure safety.

[0120] (2) Good physical and chemical properties

[0121] High hardness and wear resistance: The cross-linking properties of isocyanate significantly improve the hardness of the coating, making it have excellent wear resistance and chemical resistance, extending its service life.

[0122] Flexibility and processing performance: Propylene glycol diacetate, as a solvent and plasticizer, improves the flexibility and processing performance of the coating, enabling it to adapt to the coating requirements of various complex substrates.

[0123] Strong adhesion: The adhesion between the coating and the substrate reaches more than 7MPa, ensuring that the coating is not easy to fall off during use and maintains a long-term protective effect.

[0124] (3) Environmental protection and safety

[0125] Non-toxic and harmless: Water-based antistatic paint does not contain harmful substances such as formaldehyde and heavy metals, meets environmental protection requirements, and is harmless to the human body.

[0126] Biodegradable: The paint is completely biodegradable, reducing pollution to the environment.

[0127] (4) Convenient and efficient construction

[0128] Prepare and use immediately: The coating composition and the curing agent composition will start to react quickly after being mixed, so they must be prepared and used immediately to avoid curing problems caused by long-term storage.

[0129] The mass ratio is controllable: the mass ratio of the coating composition to the curing agent composition is controlled within the range of (4-6):1, ensuring that the two can fully react to form a coating with excellent performance.

[0130] (5) Wide range of applications

[0131] Multiple Substrates: The coating can be applied to the surface of a variety of substrates, including continuous fiber reinforced thermoplastic composites, to form a coating with excellent properties.

[0132] Various fields: Suitable for many fields that require anti-static treatment, such as electronics, communications, aerospace, plastic packaging, textiles, etc.

[0133] In summary, this water-based antistatic coating and its application have the advantages of excellent antistatic performance, good physical and chemical properties, environmental protection and safety, convenient and efficient construction, and a wide range of applications. These advantages make the coating have broad application prospects and market value in many fields.

[0134] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

[0135] Example 1

[0136] This embodiment provides a method for preparing a water-based antistatic coating, comprising the following steps:

[0137] 1) 40 kg of water-based hydroxy acrylic resin, 0.1 kg of amine neutralizer, 0.5 kg of dispersant (hydrophobic modified ethoxy polyurethane polymer), 0.2 kg of defoamer (polydimethylsiloxane), 0.2 kg of polysilicic acid magnesium aluminum, 15 kg of conductive mica powder, 30 kg of titanium dioxide and 12.8 kg of deionized water are sequentially put into a dispersion tank, the materials are evenly dispersed and then ground to a fineness of ≤30 μm;

[0138] 2) 0.5 kg of silane coupling agent, 0.5 kg of graphene, and 0.2 kg of thickener (hydrophobic group-modified ethoxylated polyurethane polymer, Aquaflow NLS200) are sequentially added to the ground material in step 1), and the mixture is filtered and removed after being stirred evenly. The viscosity of the filtered material is adjusted to 4 Pa·S, and the mixture is filtered and removed again to obtain a coating composition;

[0139] The preparation method of the water-based hydroxy acrylic resin is as follows: 10 kg of bisphenol A epoxy resin, 15 kg of n-butanol, and 30 kg of ethylene glycol monobutyl ether are put into a reactor, and after heating to 110° C., a mixture of 15 kg of acrylic acid, 10 kg of butyl acrylate, 5 kg of isooctyl acrylate, 10 kg of methyl methacrylate, 2 kg of glycidyl methacrylate, 10 kg of isobornyl methacrylate, 20 kg of styrene, and 1 kg of benzoyl peroxide is slowly added dropwise to the reactor within 3.5 hours under stirring at 300 r / min, and then kept warm for reaction at 110° C. for 5 hours, and then 5 kg of N, N-dimethylethanolamine and 80 kg of deionized water are added to obtain the water-based hydroxy acrylic resin; wherein the bisphenol A epoxy resin is E51 epoxy resin;

[0140] 3) mixing 20 kg of isocyanate with 30 kg of propylene glycol diacetate to obtain a curing agent composition;

[0141] 4) 40 kg of the coating composition was mixed with 10 kg of the curing agent composition to obtain a water-based antistatic coating.

[0142] Example 2

[0143] This embodiment provides a method for preparing a water-based antistatic coating, comprising the following steps:

[0144] 1) 40 kg of water-based hydroxy acrylic resin, 0.2 kg of amine neutralizer, 0.7 kg of dispersant (hydrophobic modified ethoxy polyurethane polymer), 0.35 kg of defoamer (polydimethylsiloxane), 0.5 kg of polysilicate magnesium aluminum, 12 kg of conductive mica powder, 30 kg of titanium dioxide and 14.3 kg of deionized water are sequentially put into a dispersion tank, the materials are evenly dispersed and then ground to a fineness of ≤30 μm;

[0145] 2) 0.8 kg of silane coupling agent, 0.8 kg of graphene, and 0.35 kg of thickener (hydrophobic group-modified ethoxylated polyurethane polymer, Aquaflow NLS200) are sequentially added to the ground material in step 1), and the mixture is filtered and removed after being stirred evenly. The viscosity of the filtered material is adjusted to 5 Pa·S, and the mixture is filtered and removed again to obtain a coating composition;

[0146] The preparation method of the water-based hydroxy acrylic resin is as follows: 12 kg of bisphenol A epoxy resin, 18 kg of n-butanol, and 42 kg of ethylene glycol monobutyl ether are put into a reactor, and after heating to 110° C., a mixed solution of 18 kg of acrylic acid, 12 kg of butyl acrylate, 6 kg of isooctyl acrylate, 12 kg of methyl methacrylate, 2.5 kg of glycidyl methacrylate, 7 kg of isobornyl methacrylate, 24 kg of styrene, and 1.2 kg of benzoyl peroxide is slowly added dropwise to the reactor within 3.5 hours under stirring at 300 r / min, and then kept warm for reaction at 110° C. for 5 hours, and then 13.5 kg of N, N-dimethylethanolamine and 60 kg of deionized water are added to obtain the water-based hydroxy acrylic resin; wherein the bisphenol A epoxy resin is E51 epoxy resin;

[0147] 3) mixing 25 kg of isocyanate with 25 kg of propylene glycol diacetate to obtain a curing agent composition;

[0148] 4) 40 kg of the coating composition was mixed with 10 kg of the curing agent composition to obtain a water-based antistatic coating.

[0149] Comparative Example

[0150] This comparative example provides a method for preparing a water-based antistatic coating, comprising the following steps:

[0151] 1) 50 kg of bisphenol A epoxy resin, 0.3 kg of amine neutralizer, 1 kg of dispersant (hydrophobic modified ethoxy polyurethane polymer), 0.5 kg of defoamer (polydimethylsiloxane), 0.8 kg of polysilicic acid magnesium aluminum, 12 kg of conductive mica powder, 30 kg of titanium dioxide, and 15 kg of deionized water are sequentially put into a dispersion tank, and the materials are evenly dispersed and then ground to a fineness of ≤30 μm; wherein the bisphenol A epoxy resin is E51 epoxy resin;

[0152] 2) 1 kg of silane coupling agent, 1 kg of graphene, and 0.5 kg of thickener (hydrophobic group-modified ethoxylated polyurethane polymer, Aquaflow NLS200) are sequentially added to the ground material in step 1), and the mixture is filtered and removed after being stirred evenly. The viscosity of the filtered material is adjusted to 6 Pa·S, and the mixture is filtered and removed again to obtain a coating composition;

[0153] 3) mixing 30 kg of isocyanate with 20 kg of propylene glycol diacetate to obtain a curing agent composition;

[0154] 4) 40 kg of the coating composition was mixed with 10 kg of the curing agent composition to obtain a water-based antistatic coating.

[0155] The properties of the water-based antistatic coatings obtained in Examples 1 to 2 and Comparative Example were measured, and the water-based antistatic coatings were coated on the surface of CFRTP to obtain a coating, and the properties of the coating were measured. The results are shown in Table 1.

[0156] Table 1 Performance of water-based antistatic coatings and coatings obtained in Examples 1 to 2 and Comparative Examples

[0157]

[0158]

[0159] In addition, one or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0160] In the embodiment of the present application, the water-based hydroxy acrylic resin mainly connects various functional groups together through the hybrid-condensation reaction technology to improve the adhesion of the coating. The addition of silane coupling agent enhances the adhesion of the coating, so that the coating can adhere to the CFRTP surface. The addition of conductive mica powder and graphene improves the conductivity of the coating and makes the coating have good antistatic properties.

[0161] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A coating composition, comprising the following components, in parts by weight: 35 to 55 parts of water-based hydroxy acrylic resin, 0.1 to 0.3 parts of amine neutralizer, 0.2 to 0.5 parts of defoamer, 0.5 to 1 parts of dispersant, 0.1 to 0.8 parts of polymagnesium aluminum silicate, 10 to 15 parts of conductive mica powder, 20 to 30 parts of titanium dioxide, 0.5 to 1 parts of silane coupling agent, 0.5 to 1 parts of graphene, 0.5 to 1 parts of thickener and 8 to 15 parts of solvent.

2. The coating composition according to claim 1, characterized in that The amine neutralizer includes: N,N-dimethylethanolamine; and / or, The defoaming agent comprises at least one of the following: polydimethylsiloxane and tributyl phosphate; and / or, The dispersant comprises: fatty acid polyethylene glycol; and / or, The thickener comprises: a hydrophobic group-modified ethoxylated polyurethane polymer.

3. The coating composition according to claim 1, characterized in that In parts by weight, the water-based hydroxy acrylic resin includes the following raw materials: bisphenol A type epoxy resin: 1 part to 20 parts, acrylic acid: 5 parts to 25 parts, butyl acrylate: 5 parts to 15 parts, isooctyl acrylate: 5 parts to 10 parts, methyl methacrylate: 5 parts to 20 parts, glycidyl methacrylate: 2 parts to 4 parts, isobornyl methacrylate: 5 parts to 10 parts, styrene: 5 parts to 30 parts, benzoyl peroxide: 1 part to 10 parts, n-butanol: 15 parts to 100 parts, ethylene glycol monobutyl ether: 30 parts to 150 parts, N,N-dimethylethanolamine: 5 parts to 40 parts, and deionized water: 50 parts to 200 parts.

4. A method for preparing the coating composition according to any one of claims 1 to 3, comprising: Mixing and grinding water-based hydroxy acrylic resin, solvent, amine neutralizer, dispersant, defoamer, poly magnesium aluminum silicate, conductive mica powder and titanium dioxide to obtain a primary mixed material; Mixing the silane coupling agent, graphene, thickener and the primary mixed material to obtain a mixed material; The mixed material is filtered to remove impurities to obtain the coating composition.

5. The method according to claim 4, characterized in that The fineness of the primary mixed material is ≤30 μm; and / or, The viscosity of the coating composition is 600 mPa·S to 1200 mPa·S.

6. The method according to claim 4, characterized in that The preparation method of the water-based hydroxy acrylic resin comprises: Mixing bisphenol A epoxy resin, n-butanol and ethylene glycol monobutyl ether to obtain a first mixed solution; Mixing acrylic acid, butyl acrylate, isooctyl acrylate, methyl methacrylate, glycidyl methacrylate, isobornyl methacrylate, styrene and benzoyl peroxide to obtain a second mixed solution; Under stirring, adding the second mixed liquid dropwise to the first mixed liquid at a set temperature to perform a mixing-polycondensation reaction to obtain a third mixed liquid; Using N,N-dimethylethanolamine to adjust the pH value of the third mixed solution to a set pH value to obtain a fourth mixed solution; the set pH value is 7 to 9; The fourth mixed liquid is dispersed with deionized water to obtain the water-based hydroxy acrylic resin.

7. The method according to claim 6, characterized in that The mixing-polycondensation reaction includes the following parameters: the heat preservation reaction temperature is 110° C. to 130° C., the stirring speed is 300 r / min to 400 r / min, the dropping time is 2.5 h to 4 h, and the heat preservation reaction time is 1.5 h to 8 h.

8. A water-based antistatic coating, comprising: The coating composition according to any one of claims 1 to 3; as well as The curing agent composition comprises, by weight, 40 to 60 parts of isocyanate and 40 to 60 parts of propylene glycol diacetate.

9. The water-based antistatic coating according to claim 8, characterized in that: The mass ratio of the coating composition to the curing agent composition is (4-6):

1.

10. An application of a water-based antistatic coating, the application comprising: The water-based antistatic coating according to claim 8 or 9 is disposed on the surface of a substrate to form a coating, wherein the substrate comprises: a continuous fiber reinforced thermoplastic composite material; the adhesion of the coating is ≥7MPa, and the grounding resistance of the coating is <1×10 9 Ω.

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