High performance suede coating and method of making same

Abstract

This invention belongs to the field of coating technology, specifically relating to a high-performance textured coating and its preparation method. The coating comprises the following components by weight: 120-150 parts of aqueous polyurethane dispersion, 9-15 parts of graphene oxide, 4-8 parts of hollow glass microspheres, 2-4 parts of polyurethane-based textured powder, 0.5-2 parts of rheology modifier, 0.5-2 parts of defoamer, 0.5-2 parts of dispersant, and 50-100 parts of solvent. This invention selects aqueous polyurethane as the matrix resin, utilizing the spatial isolation effect of spherical hollow glass microspheres, which are interspersed between graphene oxide sheets. Furthermore, the polyurethane-based textured powder optimizes the thixotropic and rheological properties of the system, improving the overall suspension stability and flow uniformity of the slurry. Simultaneously, it optimizes the dense mechanical structure within the coating film, balancing weather resistance and aging resistance with the overall stability of the coating structure, thus showing broad application prospects.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a high-performance velvet coating and its preparation method. Background Technology

[0002] With the rapid development of modern industry, material surface protection technology faces increasingly severe challenges, and the requirements for material surface performance are becoming increasingly stringent. In aerospace, marine engineering, energy, and other fields, materials are exposed to harsh environments for extended periods, making them susceptible to the effects of high temperatures, moisture erosion, and chemical corrosion, leading to performance degradation or even failure. Therefore, developing coating materials with excellent resistance to damp heat and corrosion has significant theoretical and practical application value.

[0003] Polymers exposed to the environment may degrade, discolor, and / or fracture. This is primarily because the aging and deterioration of organic coatings leads to the loss of their protective isolating function, allowing high-salinity ions to penetrate the metal surface and cause electrochemical corrosion. Therefore, one of the keys to extending the lifespan of anti-corrosion coatings is to improve the aging resistance and adhesion of organic protective coatings, preventing ion penetration into and diffusion on the metal surface.

[0004] Furthermore, in recent years, with the increasing demands for visual texture, tactile feel, weather resistance, waterproofing, and wear and scratch resistance in architectural decoration, industrial coatings, and high-end wood and metal anti-corrosion coatings, traditional flat coatings can no longer meet the dual needs of high-end decoration and functional protection. Due to its excellent visual effect, delicate and warm touch, and elegant and high-end decorative texture, suede coatings are now widely used in art walls, high-end furniture, outdoor railings, handicrafts, and special industrial coatings. Among these, polyurethane coatings are the most widely used.

[0005] Polyurethane possesses characteristics such as low-temperature resistance, high tensile strength, high elongation, high hardness, good adhesion, wear resistance, oil resistance, and resistance to chemical corrosion. Polyurethane coatings are made from isocyanates or isocyanate reaction products. It is a coating composed of polyurethane resin as the main film-forming substance, plus colored fillers, solvents, catalysts, and other auxiliary materials. Polyurethane coatings have good adhesion; high toughness; strong wear resistance; high elasticity and high gloss, and excellent corrosion resistance to acids, alkalis, salts, oils, and organic solvents. It also has good weather resistance, can be dried at high temperatures, and can be cured at low temperatures. CN102120912A discloses an elastic fleece polyurethane coating, which consists of three components: component A, component B, and component C. When used, they are mixed evenly according to the weight ratio. Component A consists of elastic polyurethane resin, fleece paste, dispersant, nano-prepolymer, leveling agent, and the remainder being diluent. Component B: Composed of HDI trimer polyisocyanate, HDI-TDI trimer, and butyl acetate; Component C: Composed of butyl acetate and propylene glycol methyl ether acetate. Compared with similar coatings on the market, this product has the following advantages: 1. It uses a superior elastic resin, increasing tactile elasticity and providing a good visual velvety feel; 2. The formula is a blend of extended pigments, mica powder, velvety powder, and nanomaterials, resulting in good weather resistance, scratch resistance, water resistance, anti-static properties, and high surface gloss; 3. It offers good application tolerance, improving coating efficiency. However, the above-mentioned process technology uses a large amount of organic solvents, which does not meet the requirements of green chemistry development; furthermore, the coating prepared by this process has poor salt spray resistance and adhesion, making it difficult to meet usage requirements. Summary of the Invention

[0006] The purpose of this invention is to overcome the problems of high cost, complicated preparation process and difficulty in industrial scale-up of existing velvet coating materials, and to propose a high-performance velvet coating with good salt spray resistance and high adhesion.

[0007] To achieve the above objectives, the present invention provides a high-performance suede coating comprising the following components in parts by weight: The composition includes 120-150 parts of waterborne polyurethane dispersion, 9-15 parts of graphene oxide, 4-8 parts of hollow glass microspheres, 2-4 parts of polyurethane fluff powder, 0.5-2 parts of rheology modifier, 0.5-2 parts of defoamer, 0.5-2 parts of dispersant, and 50-100 parts of solvent.

[0008] Existing conventional suede functional coatings generally suffer from insufficient interfacial bonding strength and weak barrier properties. During long-term service in outdoor and highly corrosive conditions, the finished coatings are prone to substantial defects such as low dry film adhesion and insufficient resistance to salt spray corrosion. In complex environments with alternating high humidity and salt spray corrosion, conventional suede coatings are prone to a series of quality problems, including localized delamination of the paint film, interfacial blistering, and secondary corrosion of the substrate. This significantly shortens the overall long-term protective service life of the coating and cannot simultaneously meet the dual requirements of a high-end decorative suede feel and industrial-grade long-term anti-corrosion protection. Moreover, the current overall formulation system of suede coatings is relatively simple, mostly relying on the simple mixing of conventional single components to achieve a basic suede appearance, without specifically constructing a dense and integrated barrier protective microstructure. At the same time, there are no suitable functional reinforcing fillers in the system, which cannot simultaneously enhance the adhesion of the resin film-forming interface, nor can they effectively block the penetration and diffusion of corrosive media. After long-term use, the finished coating is prone to continuous decline in adhesion performance and salt spray ions penetrating the paint film and corroding the substrate.

[0009] To address the common problems of weak interfacial adhesion, insufficient salt spray resistance, and poor overall service durability in existing textured coatings, this invention first selects waterborne polyurethane as the matrix resin, optimizing the matrix film-forming bonding system. It abandons traditional general-purpose primer resins with poor adhesion, incompatible systems, and insufficient film toughness, choosing a highly active waterborne polyurethane dispersion as the continuous phase film-forming matrix. This strengthens the interfacial bonding strength between the coating and various substrates such as metals and building materials from the film-forming source. Secondly, this invention adds a certain amount of two-dimensional sheet-like barrier graphene oxide, which overlaps to form a dense, interwoven physical shielding network during the film curing process. This effectively seals the microscopic capillary pores inside the coating, intercepting the inward penetration and erosion of salt spray, moisture, and corrosive anions, thus improving the coating's long-term salt spray resistance under harsh corrosive conditions. However, graphene oxide, as a nanomaterial, inherently suffers from the technical problem of easy agglomeration.

[0010] Therefore, the polyurethane-based fluffy micropowder in the system of this invention, while playing the role of a fluffy surface, can synergistically work with hollow glass microspheres. It can not only promote the dispersion of graphene oxide, but also effectively control the uniform arrangement of the micro-concave and convex structure of the coating surface, stabilize and form a delicate, warm, long-lasting anti-aging high-quality smooth fluffy surface, while optimizing the dense mechanical structure inside the paint film, taking into account the excellent surface feel, overall wear resistance, weather resistance and anti-aging performance and the comprehensive stability of the coating structure.

[0011] In one embodiment, the solid content of the aqueous polyurethane dispersion is 40-80%. Selecting an aqueous polyurethane dispersion within this solid content range can balance the system's storage stability and on-site application suitability. Too low a solid content will result in insufficient effective proportion of film-forming resin, poor film density, and decreased adhesion; too high a solid content will lead to excessive system viscosity, which can easily cause problems such as uneven dispersion, filler agglomeration, and poor leveling during application.

[0012] In one embodiment, the type of graphene oxide is not particularly limited, and any material commonly used in the art can be used. As an inorganic nanomaterial, graphene oxide typically has a lateral dimension between 0.5 and 20 μm, and can overlap within the coating film to form a physical shielding network, thereby helping to improve the coating's core protective performance, such as resistance to salt spray and water vapor penetration. In particular, graphene oxide with a lateral dimension of 1-10 μm can be selected.

[0013] In one embodiment, the type of hollow glass microspheres is not particularly limited. Specifically, hollow glass microspheres with a particle size of 2-50 μm can be selected. Compared with conventional fillers such as traditional solid glass microspheres and hard silica powder, hollow glass microspheres have lower bulk density and excellent spherical regularity. They exhibit good suspension and wettability in waterborne polyurethane coating systems, are not prone to rapid settling or agglomeration, and can be uniformly dispersed within the overall cross-linked network of the coating film, fundamentally reinforcing the dense structure of the coating film and optimizing the internal stress distribution of the coating.

[0014] In one embodiment, the polyurethane-based fluff powder is one or more of aliphatic polyurethane-based fluff powder or aromatic polyurethane-based fluff powder. Aliphatic polyurethane-based fluff powder exhibits excellent resistance to yellowing and strong UV aging stability, making it suitable for outdoor long-term corrosive coating applications. Aromatic polyurethane-based fluff powder has a moderate elastic modulus and high conformability in fluff formation, enabling the rapid construction of a uniform and delicate micro-fluffy structure. Using the two types of polyurethane fluff powder individually or in combination can synergistically optimize the surface smoothness of the coating, avoiding problems such as dryness, localized graining, and weak abrasion resistance that are common with single-powder coatings. This provides a stable and long-lasting smooth fluffy decorative effect to the coating while also enhancing the overall mechanical deformation resistance of the paint film.

[0015] In one embodiment, the type of polyurethane-based fluff powder is not particularly limited, and any commonly used powder in the art is acceptable. Generally, the particle size of the fluff powder is between 1-60 µm. Specifically, the polyurethane-based fluff powder can be selected from Microchem's DECOSOFT 7, DECOSOFT 15, DECOSOFT 18, DECOSOFT 30, DECOSOFT 60, etc. This type of polyurethane powder has uniform elasticity, is resistant to hydrolysis and yellowing, and has excellent interfacial compatibility with waterborne polyurethane resins, enabling the stable construction of a long-lasting velvety texture on the surface. In particular, polyurethane-based fluff powders of different particle sizes can be used in combination. Compared with single-particle-size fluff powder, multi-level particle size combination filling can significantly optimize the microstructure of the coating, further improve the density of the coating, and thus synergistically improve the overall adhesion and salt spray protection capability.

[0016] The addition of hollow glass microspheres and polyurethane-based fluffy micropowder not only simultaneously improves the overall protective performance and decorative velvety texture of the coating, but more importantly, it can also specifically offset and improve the negative technical problems brought about by the introduction of high-dosage graphene oxide. Graphene oxide is a sheet-like nanoparticle with extremely high specific surface energy. When added in high proportions to water-based coating systems, it is prone to sheet stacking and agglomeration. During long-term storage, it is also prone to problems such as static stratification and bottom settling, which seriously damage the overall storage stability and on-site application uniformity of the coating. Relying on the characteristics of lightweight spherical structure, hollow glass microspheres can be uniformly dispersed and filled in the gaps between graphene oxide sheets. By relying on physical isolation, the tendency of graphene oxide sheets to overlap and stack is blocked, and the overall suspension and flow properties of the slurry are simultaneously optimized and improved. Combined with polyurethane fluffy micropowder to synergistically optimize the thixotropic equilibrium state inside the system, the problems of easy agglomeration, easy settling, and poor dispersion uniformity of graphene oxide can be fundamentally solved, ensuring the stability of the coating during the storage period. Meanwhile, pure graphene oxide itself is highly rigid and lacks overall flexibility. When used alone in high-dosage formulations, it significantly increases the concentrated internal stress within the coating film, directly causing the finished coating to become brittle and its structural toughness to decrease drastically. During long-term outdoor service, this easily leads to quality defects such as cracking, microcracks, and weakened interfacial adhesion. It also results in a dry and hard feel to the surface of the coating, completely losing the basic decorative texture of a velvety finish. This invention utilizes a rigid-flexible composite technology. Rigid hollow glass microspheres are evenly dispersed to relieve the concentrated internal stress within the coating film, simultaneously building a stable and durable internal mechanical support framework. This is combined with flexible polyurethane fluff micropowder to release residual stress at the coating interface, while simultaneously softening and optimizing the tactile feel of the coating surface. The complementary rigid and flexible structures have strong compatibility, effectively offsetting the negative defects of brittleness caused by high-dosage graphene oxide, comprehensively improving the mechanical resistance of the coating, and restoring the delicate, warm, uniform, and long-lasting high-quality velvety feel of the coating.

[0017] Meanwhile, the addition of sheet-like graphene oxide inevitably leads to the formation of porous structures. Hollow glass microspheres can densely fill and seal the original capillary micropores inside the paint film caused by the addition of graphene oxide, effectively blocking the longitudinal penetration and erosion paths of water vapor and salt spray corrosive ions. Meanwhile, polyurethane fluff micro powder can closely adhere to the coating resin interface, precisely sealing the micro gaps at the interface. The three work together to construct an integrated dense protective network of "sheet-like barrier + pore filling + interface sealing", which enhances the coating's comprehensive service performance, such as salt spray resistance, while fully preserving the core long-term anti-corrosion advantages of graphene oxide. In addition, graphene oxide only has a single anti-corrosion protection function and does not have the ability to form a velvety decorative texture. With the synergistic regulation of the morphology of the two functional micro powders, the hollow glass microspheres can uniformly support the regular microstructure of the bottom layer of the paint film, and the polyurethane velvety micro powder is arranged in an orderly manner to form a delicate velvety texture. The two work together to shape the coating, and finally achieve a balance between the high-strength anti-corrosion protection performance and the high-end delicate velvety decorative texture, effectively adapting to the needs of long-term integrated coating in multiple outdoor scenarios.

[0018] In one embodiment, the rheology modifier is one or more of Glide 450, Glide 100, BYK-190, BYK-420, BYK-425, BYK-430, BYK-331, BYK-381, and BYK3455.

[0019] In one embodiment, the defoaming agent is one or more of polydimethylsiloxane, glycerol polyoxypropylene ether, and polyoxypropylene polyoxyethylene glycerol ether.

[0020] In one embodiment, the dispersant is one or more of polyphosphate, polysulfonate, dodecyl sulfate, polyether-modified polycarboxylate, sodium polyacrylate, and ammonium polyacrylate.

[0021] In one embodiment, the solvent is deionized water. Using deionized water as the dispersion solvent is advantageous because it contains no organic solvents, is green with low VOCs, and is environmentally friendly and pollution-free, meeting current compliance requirements for green production in industrial coating.

[0022] In one embodiment, the high-performance suede coating comprises the following components in parts by weight: The composition includes 125-145 parts of aqueous polyurethane dispersion, 10-13 parts of graphene oxide, 5-7 parts of hollow glass microspheres, 2.5-3.5 parts of polyurethane-based fluff powder, 0.5-2 parts of rheology modifier, 0.5-2 parts of defoamer, 0.5-2 parts of dispersant, and 50-100 parts of solvent. The abundant oxygen-containing functional groups (such as hydroxyl and carboxyl groups) on the surface of graphene oxide can undergo chemical cross-linking reactions with the resin matrix and form hydrogen bonds with metal substrates, thus significantly improving the bonding strength between the coating and the substrate. However, when the amount of fillers such as graphene oxide is excessive, irreversible aggregation of the nanosheets occurs due to strong van der Waals forces, disrupting the uniform cross-linking network within the coating and leading to decreased adhesion.

[0023] In one embodiment, the mass ratio of graphene oxide, hollow glass microspheres, and polyurethane-based fluff powder is (3.5-4.5):(1.5-2.5):1.

[0024] On the other hand, the present invention also provides a method for preparing the aforementioned high-performance coating material, comprising the following steps: (1) Weigh out the water-based polyurethane dispersion, graphene oxide, hollow glass microspheres, polyurethane fluff powder, rheology modifier, defoamer, dispersant and solvent by weight. (2) Disperse each component evenly in a reactor to obtain a high-performance coating material.

[0025] This preparation method is simple, mild, and does not require complex equipment with high temperature and high pressure. It has low energy consumption, high production efficiency, good batch product performance consistency, and is suitable for large-scale continuous industrial production. The finished coating has a long storage period, is easy to apply, and is suitable for batch coating applications on multiple industries and substrates.

[0026] Beneficial effects: This invention uses waterborne polyurethane as the film-forming matrix and couples graphene oxide to construct an anti-corrosion shielding system. At the same time, it matches hollow glass microspheres and polyurethane-like fluffy micropowder to construct a composite modification system. While giving full play to the excellent physical barrier and salt spray resistance of graphene oxide, it also solves the technical drawbacks caused by high addition of graphene oxide.

[0027] (1) Effectively improves the storage and construction stability of the coating system and solves the problems caused by high graphene oxide content. This invention utilizes the spatial isolation effect of spherical hollow glass microspheres, which are interspersed and dispersed between graphene oxide sheets. In addition, it works in conjunction with polyurethane-based fluff micropowder to optimize the thixotropic and rheological properties of the system, thereby synergistically improving the overall suspension stability and flow uniformity of the slurry. This fundamentally eliminates problems such as powder sedimentation, local particle aggregation, and construction defects, ensuring that the coating does not separate during long-term storage and has no surface defects during construction.

[0028] (2) It efficiently optimizes the mechanical structure and interfacial adhesion of the coating film, and offsets the defects of high rigidity and high film brittleness of graphene oxide. Graphene oxide alone will greatly increase the residual concentrated stress inside the coating film, resulting in insufficient toughness, easy cracking, adhesion decay and dry surface feel. It relies on the rigid skeleton of hollow glass microspheres to support and uniformly disperse the stress inside the film. It is combined with flexible polyurethane fluff micro powder to release interfacial stress and soften the surface texture. The rigid and flexible synergy strengthens the comprehensive mechanical properties of the coating film, improves the coating's resistance to bending, impact and cracking, stabilizes the interfacial adhesion between the coating and various substrates, and avoids the risk of delamination and failure of the coating film in the later stage.

[0029] (3) On the basis of giving the coating a velvety effect, it makes up for the protective gap caused by uneven local dispersion of graphene oxide. The single-layer barrier mode of graphene oxide is prone to protection blind spots and the salt spray resistance is limited. The hollow glass microspheres tightly seal the capillary permeation micropores inside the paint film, and the polyurethane-type velvety micro powder seals the micro gaps at the interface between the resin and the filler. It deeply links with the graphene oxide sheet barrier network to block the water vapor and salt spray corrosive ion permeation path, and simultaneously enhances the comprehensive protection performance of hydrolysis resistance, aging resistance and damp heat resistance, and is long-term suitable for the service requirements of harsh outdoor corrosive conditions.

[0030] This invention systematically solves several industry bottlenecks of graphene oxide modified coatings without sacrificing core anti-corrosion performance. It has multiple advantages such as strong adhesion, excellent salt spray resistance, delicate texture, stable storage, good workability, and good mechanical durability. The process is simple and easy to mass-produce, and it has broad prospects for industrial application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] The following examples and comparative examples share the same preparation process for suede coatings, specifically including the following steps: (1) Weigh out the following components by weight: water-based polyurethane dispersion, graphene oxide (or graphene), hollow glass microspheres, polyurethane fluff powder, rheology modifier, defoamer, dispersant, and deionized water. (2) Disperse each component evenly in a reactor to obtain a high-performance coating material.

[0033] Subsequently, under the same conditions, the high-performance suede coatings prepared in the examples and comparative examples were subjected to film adhesion tests (refer to GB / T 5210-2006) and salt spray resistance tests (refer to GB / T 1771-2007).

[0034] Example 1

[0035] A high-performance suede coating comprises the following components in parts by weight: The composition includes 120 parts of waterborne polyurethane dispersion (60% solids content), 9 parts of graphene oxide (average size 2μm), 4 parts of hollow glass microspheres (average particle size 15μm), 4 parts of DECOSOFT 15 fluff powder, 0.5 parts of rheology modifier BYK-420, 2 parts of defoamer polydimethylsiloxane, 2 parts of dispersant sodium polyacrylate, and 70 parts of deionized water. Testing showed that the adhesion of the fluffy coating film was 5.1 MPa, and its salt spray resistance was 840 h.

[0036] Example 2

[0037] A high-performance suede coating comprises the following components in parts by weight: The composition includes 150 parts of waterborne polyurethane dispersion (60% solids content), 13 parts of graphene oxide (average size 2μm), 8 parts of hollow glass microspheres (average particle size 15μm), 2 parts of DECOSOFT 60 fluff powder, 2 parts of rheology modifier BYK-430, 2 parts of defoamer polydimethylsiloxane, 0.5 parts of dispersant sodium polyacrylate, and 90 parts of deionized water. Testing showed that the adhesion of the flocked coating film was 4.2MPa, and its salt spray resistance was 970h.

[0038] Example 3

[0039] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 140 parts of waterborne polyurethane dispersion (60% solids content), 12 parts of graphene oxide (average size 2 μm), 6.5 parts of hollow glass microspheres (average particle size 15 μm), 3 parts of DECOSOFT 7 fluff powder, 1.5 parts of rheology modifier BYK-425, 1.5 parts of defoamer polydimethylsiloxane, 1.5 parts of dispersant sodium polyacrylate, and 80 parts of deionized water. Testing showed that the coating film adhesion was 4.6 MPa and the salt spray resistance was 880 h.

[0040] Example 4

[0041] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 125 parts of waterborne polyurethane dispersion (60% solids content), 10 parts of graphene oxide (average size 2 μm), 4.5 parts of hollow glass microspheres (average particle size 15 μm), 2 parts of DECOSOFT 7 fluff powder, 0.8 parts of rheology modifier BYK-425, 1.8 parts of defoamer polydimethylsiloxane, 1.7 parts of dispersant sodium polyacrylate, and 75 parts of deionized water. Testing showed that the coating film adhesion was 4.9 MPa and the salt spray resistance was 810 h.

[0042] Example 5

[0043] A high-performance suede coating comprises the following components in parts by weight: The composition includes 140 parts of waterborne polyurethane dispersion (60% solids content), 12 parts of graphene oxide (average size 2 μm), 6.5 parts of hollow glass microspheres (average particle size 15 μm), 3 parts of DECOSOFT 7 and DECOSOFT 18 (a 1:1 mass ratio mixture) fluff powder, 1.5 parts of rheology modifier BYK-425, 1.5 parts of defoamer polydimethylsiloxane, 1.5 parts of dispersant sodium polyacrylate, and 80 parts of deionized water. Testing showed that the adhesion of the fluffy coating film was 5.0 MPa and its salt spray resistance was 950 h.

[0044] Example 6

[0045] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 130 parts waterborne polyurethane dispersion (60% solids content), 11 parts graphene oxide (average size 2 μm), 5 parts hollow glass microspheres (average particle size 15 μm), 2.5 parts DECOSOFT 60 fluff powder, 1 part rheology modifier BYK-420, 1 part defoamer polydimethylsiloxane, 1.5 parts dispersant sodium polyacrylate, and 75 parts deionized water. Testing showed that the coating film adhesion was 4.8 MPa and the salt spray resistance was 890 h.

[0046] Example 7

[0047] A high-performance suede coating comprises the following components in parts by weight: The composition includes 140 parts of waterborne polyurethane dispersion (60% solids content), 15 parts of graphene oxide (average size 2 μm), 6.5 parts of hollow glass microspheres (average particle size 15 μm), 3 parts of DECOSOFT 7 and DECOSOFT 18 (a 1:1 mass ratio mixture) fluff powder, 1.5 parts of rheology modifier BYK-425, 1.5 parts of defoamer polydimethylsiloxane, 1.5 parts of dispersant sodium polyacrylate, and 80 parts of deionized water. Testing showed that the adhesion of the fluffy coating film was 4.7 MPa, and its salt spray resistance was 920 h.

[0048] Example 8

[0049] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 135 parts of waterborne polyurethane dispersion (60% solids content), 14 parts of graphene oxide (average size 2 μm), 7 parts of hollow glass microspheres (average particle size 15 μm), 3.5 parts of DECOSOFT 15 fluff powder, 1.3 parts of rheology modifier BYK-430, 0.5 parts of defoamer polydimethylsiloxane, 1.3 parts of dispersant sodium polyacrylate, and 85 parts of deionized water. Testing showed that the coating film adhesion was 4.3 MPa and the salt spray resistance was 950 h.

[0050] Example 9

[0051] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 145 parts of waterborne polyurethane dispersion (60% solids content), 12.5 parts of graphene oxide (average size 2 μm), 6 parts of hollow glass microspheres (average particle size 15 μm), 2.8 parts of DECOSOFT 15 fluff powder, 1.2 parts of rheology modifier BYK-420, 1.2 parts of defoamer polydimethylsiloxane, 1.1 parts of dispersant sodium polyacrylate, and 80 parts of deionized water. Testing showed that the coating film adhesion was 5.0 MPa and the salt spray resistance was 910 h.

[0052] Example 10

[0053] A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 140 parts waterborne polyurethane dispersion (60% solids content), 12 parts graphene oxide (average size 2 μm), 6.5 parts hollow glass microspheres (average particle size 15 μm), 3 parts DECOSOFT 18 fluff powder, 1.5 parts rheology modifier BYK-425, 1.5 parts defoamer polydimethylsiloxane, 1.5 parts dispersant sodium polyacrylate, and 80 parts deionized water. Testing showed that the coating film adhesion was 4.5 MPa and the salt spray resistance was 870 h.

[0054] Comparative Example 1 A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of: 140 parts waterborne polyurethane dispersion (60% solids content), 12 parts graphene oxide (average size 2 μm), 0 parts hollow glass microspheres (average particle size 15 μm), 9.5 parts DECOSOFT 18 fluff powder, 1.5 parts rheology modifier BYK-425, 1.5 parts defoamer polydimethylsiloxane, 1.5 parts dispersant sodium polyacrylate, and 80 parts deionized water. Testing showed that the coating film adhesion was 4.0 MPa and the salt spray resistance was 690 h.

[0055] Comparative Example 2 A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of: 140 parts waterborne polyurethane dispersion (60% solids content), 12 parts graphene oxide (average size 2 μm), 9.5 parts hollow glass microspheres (average particle size 15 μm), 0 parts DECOSOFT 18 fluff powder, 1.5 parts rheology modifier BYK-425, 1.5 parts defoamer polydimethylsiloxane, 1.5 parts dispersant sodium polyacrylate, and 80 parts deionized water. Testing showed that the coating film adhesion was 3.4 MPa and the salt spray resistance was 760 h.

[0056] Comparative Example 3 A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 140 parts of waterborne polyurethane dispersion (60% solids content), 12 parts of graphene oxide (average size 2 μm), 3 parts of hollow glass microspheres (average particle size 15 μm), 6.5 parts of DECOSOFT 18 fluff powder, 1.5 parts of rheology modifier BYK-425, 1.5 parts of defoamer polydimethylsiloxane, 1.5 parts of dispersant sodium polyacrylate, and 80 parts of deionized water. Testing showed that the coating film adhesion was 3.6 MPa and the salt spray resistance was 730 h.

[0057] Comparative Example 4 A high-performance suede coating comprises the following components in parts by weight: The composition of this textured coating consists of 140 parts waterborne polyurethane dispersion (60% solids content), 12 parts graphene (average size 2 μm), 6.5 parts hollow glass microspheres (average particle size 15 μm), 3 parts DECOSOFT 18 fluff powder, 1.5 parts rheology modifier BYK-425, 1.5 parts defoamer polydimethylsiloxane, 1.5 parts dispersant sodium polyacrylate, and 80 parts deionized water. Testing showed that the coating film adhesion was 3.2 MPa and the salt spray resistance was 790 h.

[0058] As can be seen from the above embodiments and comparative examples, the present invention selects waterborne polyurethane as the matrix resin, which effectively improves the storage and construction stability of the coating system and solves the problems caused by high graphene oxide content. When high specific surface area sheet graphene oxide is mixed alone, it is very easy to cause problems such as sheet stacking and agglomeration, system stratification and sedimentation, and poor dispersion uniformity, which significantly affects the shelf life of the finished coating and the on-site coating effect. The present invention utilizes the spatial isolation effect of spherical hollow glass microspheres, which are interspersed and dispersed between graphene oxide sheets, and then works in conjunction with polyurethane-like fluffy micropowder to optimize the thixotropic and rheological properties of the system, synergistically improving the overall suspension stability and flow uniformity of the slurry, fundamentally eliminating problems such as powder sedimentation, local particle agglomeration, and construction defects, ensuring that the coating does not stratify during long-term storage and has no surface defects after construction, while optimizing the dense mechanical structure inside the paint film, taking into account the excellent surface feel, overall wear resistance, weather resistance and anti-aging performance, and comprehensive stability of the coating structure.

[0059] Specifically, compared to Example 10, Comparative Examples 1 and 2 lacked hollow glass microspheres and polyurethane-based fluff powder, respectively, making it impossible to utilize the rigid-flexible compounding technique. This resulted in concentrated internal stress in the paint film, failing to offset the brittleness caused by high graphene oxide doping, and reducing coating adhesion and corrosion resistance. Comparative Example 3 shows that the amounts of polyurethane-based fluff powder and hollow glass microspheres need to be adjusted. This invention uses a large number of hollow glass microspheres to regularly support the underlying microstructure points, while a small amount of polyurethane-based fluff powder is oriented to create a warm, velvety texture, effectively balancing adhesion and salt spray resistance. Excessive polyurethane-based fluff powder and insufficient hollow glass microspheres can easily lead to insufficient internal rigid support in the coating, reduced pore sealing ability, and poor interfacial bonding stability, ultimately resulting in substantial defects such as significantly reduced paint film adhesion and drastically deteriorated salt spray resistance. Compared to Example 10, Comparative Example 4 directly replaced graphene oxide with graphene. Although the salt spray resistance did not change significantly, the adhesion was greatly reduced. This is because ordinary graphene has strong chemical inertness on its surface and contains almost no hydrophilic active oxygen functional groups, resulting in extremely poor wettability in waterborne polyurethane systems. It is prone to large-area stacking and aggregation, making it impossible to disperse evenly inside the coating film and form a continuous and dense physical shielding network. At the same time, the interfacial bonding force between inert graphene and waterborne resin is weak, which easily forms a large number of interfacial defects and micro-voids inside the coating film, destroying the overall density of the coating and further reducing the interfacial bonding strength between the coating and the substrate, resulting in a significant decrease in adhesion.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described; these embodiments not explicitly stated should also be considered within the scope of this specification. Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A high-performance suede coating, characterized in that, It contains the following components in parts by weight: The composition includes 120-150 parts of waterborne polyurethane dispersion, 9-15 parts of graphene oxide, 4-8 parts of hollow glass microspheres, 2-4 parts of polyurethane fluff powder, 0.5-2 parts of rheology modifier, 0.5-2 parts of defoamer, 0.5-2 parts of dispersant, and 50-100 parts of solvent.

2. The high-performance suede coating as described in claim 1, characterized in that, The waterborne polyurethane dispersion has a solid content of 40-80%.

3. The high-performance suede coating as described in claim 1, characterized in that, The polyurethane fluff powder is one or more of aliphatic polyurethane fluff powder or aromatic polyurethane fluff powder.

4. The high-performance suede coating as described in claim 1, characterized in that, The rheology modifier is one or more of Glide 450, Glide 100, BYK-190, BYK-420, BYK-425, BYK-430, BYK-331, BYK-381, and BYK3455.

5. The high-performance suede coating as described in claim 1, characterized in that, The defoaming agent is one or more of polydimethylsiloxane, glycerol polyoxypropylene ether, and polyoxypropylene polyoxyethylene glycerol ether.

6. The high-performance suede coating as described in claim 1, characterized in that, The dispersant is one or more of polyphosphate, polysulfonate, dodecyl sulfate, polyether-modified polycarboxylate, sodium polyacrylate, and ammonium polyacrylate.

7. The high-performance suede coating as described in claim 1, characterized in that, The solvent is deionized water.

8. The high-performance suede coating as described in claim 1, characterized in that, It contains the following components in parts by weight: The composition includes 125-145 parts of waterborne polyurethane dispersion, 10-13 parts of graphene oxide, 5-7 parts of hollow glass microspheres, 2.5-3.5 parts of polyurethane fluff powder, 0.5-2 parts of rheology modifier, 0.5-2 parts of defoamer, 0.5-2 parts of dispersant, and 50-100 parts of solvent.

9. The high-performance suede coating as described in claim 1, characterized in that, The mass ratio of graphene oxide, hollow glass microspheres, and polyurethane-based fluff powder is (3.5-4.5):(1.5-2.5):

1.

10. The method for preparing a high-performance coating material as described in claim 1, characterized in that, Includes the following steps: (1) Weigh out the water-based polyurethane dispersion, graphene oxide, hollow glass microspheres, polyurethane fluff powder, rheology modifier, defoamer, dispersant and solvent by weight. (2) Disperse each component evenly in a reactor to obtain a high-performance coating material.