Product with colored composite coating and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and relates to a product with a colored composite coating and a preparation method of the product. The composite coating comprises a golden oil primer layer, a UV primer layer, a UV opaque coating, a UV pattern layer, a UV finish paint layer and a golden oil finish paint layer, an integral performance system of strong adhesion of a bottom layer, excellent color development of a middle layer and high protection of a surface layer is constructed, and through the synergistic effect of all the coatings, the whole composite coating is good in performance, strong in adhesion force, high in hardness and excellent in corrosion resistance and friction resistance; the color is bright and not easy to fade, so that obvious use value is brought to consumers, and the experience is upgraded.

Description

Technical Field

[0001] This invention belongs to the field of coating technology and relates to a product with a colored composite coating and its preparation method. Background Technology

[0002] With the upgrading of consumption and the increasing demand for personalization, the market has placed higher demands on the aesthetic value and emotional experience of products. Products with colored composite coatings, with their customizable exquisite patterns and rich color combinations, can accurately match different home styles and influence consumers' emotions through visual signals. Therefore, such products are widely used in various fields, especially in the home furnishing sector, which is closely related to daily life, where market penetration continues to increase.

[0003] From a product structure perspective, existing products with colored composite coatings typically employ a multi-layer structure of "substrate + composite coating." The composite coating, layered on the substrate surface, is the core element for achieving the desired appearance. In practice, key performance characteristics such as surface hardness, coating adhesion, chemical corrosion resistance, and abrasion resistance directly depend on the formulation design and manufacturing process of the composite coating. Excellent composite coating performance ensures the product maintains its appearance integrity and color durability over a long period; conversely, insufficient composite coating performance severely impacts product lifespan and user experience.

[0004] Currently, most products on the market with composite coatings still have significant performance defects in their composite coatings, such as insufficient coating adhesion, easy peeling and flaking; poor abrasion and corrosion resistance, which can lead to coating wear or corrosion after long-term use; and the patterns and colors are not durable, easily fading and dulling, affecting the appearance.

[0005] The aforementioned defects severely impact the appearance durability and reliability of products with color composite coatings. Therefore, optimizing the structural design and formulation of color composite coatings to improve their adhesion, abrasion resistance, and corrosion resistance has become a critical technical challenge that the industry urgently needs to address. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a product with a colored composite coating and a method for preparing the same, wherein the composite coating exhibits excellent adhesion, corrosion resistance and abrasion resistance.

[0007] The present invention employs the following technical solutions to achieve its objective:

[0008] One aspect of the present invention provides a product having a color composite coating, comprising a substrate and a color composite coating attached above the substrate, the color composite coating comprising a UV ink printing layer and a gold oil topcoat layer;

[0009] The UV ink printing layer comprises, in sequence, a UV primer layer, a UV opaque coating layer, a UV pattern layer, and a UV topcoat layer;

[0010] The substrate material is one or more of stainless steel, plastic, and glass;

[0011] When the substrate material is stainless steel or glass, the gold oil topcoat layer is made of acrylic resin coating, which includes:

[0012] 80-95 wt% acrylic resin

[0013] Organic solvent 5-20 wt%;

[0014] When the substrate material is plastic, the gold oil topcoat layer is made of hydroxyl acrylic resin coating, which includes:

[0015] 70-90 wt% hydroxyl acrylic resin

[0016] Organic solvent 10-30 wt%.

[0017] Colored composite coatings can be applied to a localized or complete area of ​​the substrate surface, and the specific application location can be selected according to the actual needs of the product.

[0018] The UV ink printing layer is printed by a digital printer using UV ink. The UV ink printing layer includes, in sequence, a UV primer layer, a UV opaque coating layer, a UV pattern layer, and a UV topcoat layer. The UV primer layer is located above the substrate, the UV opaque coating layer is located above the UV primer layer, the UV pattern layer is located above the UV opaque coating layer, and the UV topcoat layer is located above the UV pattern layer.

[0019] The UV primer layer is transparent and is used to improve the adhesion of subsequent coatings, effectively preventing the pattern from peeling or fading, and ensuring the durability and clarity of the pattern in the UV pattern layer. The ink that forms the UV primer layer includes the following components:

[0020] 4-(1-oxo-2-propenyl)morpholine: 25-30 wt%;

[0021] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0022] 2-Methyl 2-acrylate (tetrahydro-2-furanyl) ester: 20-25 wt%;

[0023] Polyacrylic acid: 5-15 wt%;

[0024] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0025] UV masking coatings are available in white, black, blue, red, yellow, etc., and are used to cover the base color of the substrate to prevent the pattern layer's color from being interfered with by the base color. The inks used to form the UV masking coating are white, yellow, red, blue, or black inks.

[0026] Preferably, the white ink comprises a white pigment, such as titanium dioxide. Further, it comprises the following components:

[0027] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0028] 4-(1-oxo-2-propenyl)morpholine: 25-30 wt%;

[0029] 2-Methyl acrylate (tetrahydro-2-furanyl) ester: 15-20 wt%;

[0030] Titanium dioxide: 5-15 wt%;

[0031] Polyacrylic acid: 5-15 wt%;

[0032] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0033] Black ink includes black pigments, such as carbon black. Furthermore, black ink includes the following components:

[0034] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0035] 4-(1-oxo-2-propenyl)morpholine: 30-40 wt%;

[0036] Carbon black: 5-15 wt%;

[0037] Polyacrylic acid: 5-15 wt%;

[0038] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0039] Red ink includes red pigments such as 5,12-dihydro-2,9-dimethylquinolino[2,3-b]acridin-7,14-dione. Furthermore, red ink includes the following components:

[0040] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0041] 4-(1-oxo-2-propenyl)morpholine: 30-40 wt%;

[0042] 5,12-Dihydro-2,9-Dimethylquinolino[2,3-b]acridin-7,14-dione: 5-15 wt%;

[0043] Polyacrylic acid: 5-15 wt%;

[0044] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0045] Yellow ink includes yellow pigments, such as 5,5'-azobis-2,4,6-(1H,3H,5H)pyrimidinetrione nickel complex, etc. Furthermore, yellow ink includes the following components:

[0046] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0047] 4-(1-oxo-2-propenyl)morpholine: 30-40 wt%;

[0048] 5,5'-Azobis-2,4,6-(1H,3H,5H)pyrimidinetrione nickel complex: 5-15 wt%;

[0049] Polyacrylic acid: 5-15 wt%;

[0050] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0051] Blue ink includes blue pigments, such as phthalocyanine blue. Furthermore, blue ink includes the following components:

[0052] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%;

[0053] 4-(1-oxo-2-propenyl)morpholine: 30-40 wt%;

[0054] Phthalocyanine Blue: 5-15 wt%;

[0055] Polyacrylic acid: 5-15 wt%;

[0056] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

[0057] The UV pattern layer is the pattern presented by the color composite coating. The inks that form the UV pattern layer include yellow ink, red ink, blue ink, and black ink. During the printing process, the corresponding pattern is obtained by adjusting the content of each color ink.

[0058] The UV topcoat layer serves as a "surface protection and decorative layer" for printed materials, protecting the pattern layer from external damage while enhancing its appearance and texture. The ink used to form the UV topcoat layer has the same composition as the ink used to form the UV primer layer.

[0059] Preferably, when the substrate material is stainless steel or glass, a gold oil primer layer is further included between the substrate and the UV primer layer, and the gold oil primer layer is made of the acrylic resin coating.

[0060] Preferably, when the substrate material is plastic, a PP coating is further included between the substrate and the UV primer layer, and the PP coating is made of the following PP coating:

[0061] Polypropylene (PP) 50-70 wt%,

[0062] Organic solvent 30-50 wt%.

[0063] Preferably, the organic solvent used herein is an acetate ester, including one or more of ethyl acetate, propyl acetate, butyl acetate, butyl propionate, and ethyl butyrate. More preferably, the organic solvent is butyl acetate.

[0064] The thicknesses of the gold oil primer layer, PP coating, UV primer layer, UV opaque coating, UV pattern layer, UV topcoat layer, and gold oil topcoat layer are 5–30 μm, respectively.

[0065] Preferably, the total thickness of the colored composite coating is 60–150 μm.

[0066] The plastics mentioned in this article may be one or more of the following: PP, polyethylene (PE), ABS plastic, styrene copolymers, polyamide (PA), and polycarbonate (PC).

[0067] A second aspect of the present invention provides a process for preparing a product with a colored composite coating, comprising the following steps:

[0068] S1. Spray the ink of the UV primer layer onto the substrate surface and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer; spray the ink of the UV pattern layer onto the surface of the UV opaque coating layer and cure it with a UV lamp to form a UV pattern layer; spray the ink of the UV topcoat layer onto the surface of the UV pattern layer and cure it with a UV lamp to form a UV topcoat layer.

[0069] S2. Spray acrylic resin coating or hydroxyl acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

[0070] Preferably, when the substrate material is stainless steel or glass, the preparation process includes the following steps:

[0071] S0. Apply acrylic resin coating to the substrate to form a gold oil primer layer;

[0072] S1. Spray the ink of the UV primer layer onto the surface of the gold oil primer layer and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer; spray the ink of the UV pattern layer onto the surface of the UV opaque coating layer and cure it with a UV lamp to form a UV pattern layer; spray the ink of the UV topcoat layer onto the surface of the UV pattern layer and cure it with a UV lamp to form a UV topcoat layer.

[0073] S2. Spray acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

[0074] Preferably, during the spraying process in steps S0 and S2, the gun distance is 40-80mm, the nozzle diameter is 0.6-1.5mm, the spray gun pressure is 0.1-1.0MPa, and the speed is 0.1-1m / s.

[0075] Preferably, the baking temperature in step S0 is 120–160°C, and the baking time is 5–40 min.

[0076] Preferably, in step S2, after spraying the acrylic resin coating, the baking temperature is 150-200℃ and the baking time is 20-70 minutes.

[0077] Preferably, when the substrate material is plastic, the preparation process includes the following steps:

[0078] S0. Apply PP coating to the substrate to form a PP coating layer;

[0079] S1. Spray the ink of the UV primer layer onto the surface of the PP coating and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer; spray the ink of the UV pattern layer onto the surface of the UV opaque coating layer and cure it with a UV lamp to form a UV pattern layer; spray the ink of the UV topcoat layer onto the surface of the UV pattern layer and cure it with a UV lamp to form a UV topcoat layer.

[0080] S2. Spray hydroxyl acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

[0081] Preferably, during the spraying process in step S2, the gun distance is 40-80mm, the nozzle diameter is 0.6-1.5mm, the spray gun pressure is 0.1-1.0MPa, and the speed is 0.1-1m / s.

[0082] Preferably, the baking conditions for steps S0 and S2 are: baking temperature of 60-80℃ and baking time of 10-40min.

[0083] Compared with the prior art, the present invention has the following beneficial effects:

[0084] 1. This invention designs a unique underlying structure for different substrate materials: a "golden oil primer layer" (made of acrylic resin coating) is added to stainless steel or glass substrates, and a "PP coating" (made of polypropylene coating) is added to plastic substrates. Together with the UV primer layer, the bonding force between the composite coating and the substrate is greatly improved, preventing the coating from peeling and falling off.

[0085] 2. The UV ink printing layer formed using the ink of this invention: The UV primer layer provides stable adhesion for the overall coating, ensuring reliable interlayer bonding; the UV opaque coating effectively covers the substrate's base color, providing a pure color base for the UV pattern layer; the UV topcoat layer provides surface protection. The entire UV ink printing layer not only makes the pattern colors vibrant and saturated with excellent visual effects, but also possesses superior long-term performance stability, effectively preventing fading, loss of gloss, or dullness, significantly improving color durability.

[0086] 3. The UV topcoat layer and the gold oil topcoat layer form a double layer of protection, which can resist friction damage and environmental corrosion (such as kitchen oil stains), prevent coating damage or substrate damage, and extend the product's service life.

[0087] 4. The composite coating of this invention includes: a gold oil primer layer, a UV primer layer, a UV opaque coating layer, a UV pattern layer, a UV topcoat layer, and a gold oil topcoat layer, forming a complete performance system of "strong adhesion at the bottom layer - excellent color development in the middle layer - high protection at the surface layer". The synergistic effect between the coatings makes the entire composite coating have excellent performance, strong adhesion, high hardness, excellent corrosion resistance and abrasion resistance, bright color, and is not easy to fade, bringing significant use value and an upgraded experience to consumers. Attached Figure Description

[0088] Figure 1 Image of a stainless steel cutting board with a colored composite coating prepared in Example 1 of the present invention;

[0089] Figure 2 Image of a stainless steel drain plate with a colored composite coating prepared in Example 2 of the present invention;

[0090] Figure 3 Image of a PP overflow cap with a colored composite coating prepared in Example 3 of the present invention. Detailed Implementation

[0091] In the description of this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, and includes both a and b. "Multiple" includes two, three, four, five, or more.

[0092] The technical solution of the present invention will be further described and illustrated below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of helping to understand the present invention and are not intended to limit the specific scope of the present invention. Furthermore, the accompanying drawings used herein are merely for better illustrating the content disclosed in the present invention and do not limit the scope of protection. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used in the art, and the methods used in the embodiments are all conventional methods in the art.

[0093] In the following examples and comparative examples, the ink composition of the UV printing layer is as follows:

[0094] The ink components that form the UV primer layer and UV topcoat layer are:

[0095] 4-(1-oxo-2-propenyl)morpholine: 30 wt%;

[0096] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 27 wt%;

[0097] 2-Methyl acrylate (tetrahydro-2-furanyl) ester: 23 wt%;

[0098] Polyacrylic acid: 12wt%;

[0099] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 8 wt%.

[0100] The resulting UV-masking coating is white, and the white ink composition is:

[0101] 4-(1-oxo-2-propenyl)morpholine: 30 wt%;

[0102] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 27 wt%;

[0103] 2-Methyl acrylate (tetrahydro-2-furanyl) ester: 17 wt%;

[0104] Titanium dioxide: 10 wt%;

[0105] Polyacrylic acid: 10 wt%;

[0106] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 6 wt%.

[0107] The components of black ink are:

[0108] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 28 wt%;

[0109] 4-(1-oxo-2-propenyl)morpholine: 40 wt%;

[0110] Carbon black: 12 wt%;

[0111] Polyacrylic acid: 12wt%;

[0112] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 8 wt%.

[0113] The red ink's components are:

[0114] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 28 wt%;

[0115] 4-(1-oxo-2-propenyl)morpholine: 40 wt%;

[0116] 5,12-Dihydro-2,9-Dimethylquinolino[2,3-b]acridin-7,14-dione: 12wt%;

[0117] Polyacrylic acid: 12wt%;

[0118] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 8 wt%.

[0119] Yellow ink composition:

[0120] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 28 wt%;

[0121] 4-(1-oxo-2-propenyl)morpholine: 40 wt%;

[0122] 5,5'-Azobis-2,4,6-(1H,3H,5H)pyrimidinetrione nickel complex: 12wt%;

[0123] Polyacrylic acid: 12wt%;

[0124] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 8 wt%.

[0125] The components of blue ink are:

[0126] 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 28 wt%;

[0127] 4-(1-oxo-2-propenyl)morpholine: 40 wt%;

[0128] Phthalocyanine Blue: 12 wt%;

[0129] Polyacrylic acid: 12wt%;

[0130] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 8 wt%.

[0131] Example 1

[0132] Example 1: A stainless steel cutting board with a colored composite coating was prepared by the following method:

[0133] S0 acrylic resin coating is sprayed onto a local area of ​​the polished stainless steel cutting board surface using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s). It is then baked at 140℃ for 20min to form a golden oil primer layer with a thickness of 15μm.

[0134] The acrylic resin coating consists of 90 wt% acrylic resin and 10 wt% butyl acetate, and was purchased from Zhejiang Keyoujia New Material Technology Co., Ltd.

[0135] S1. The UV ink printing layer is printed on a Ricoh G6 UV printer. The ink for the UV primer layer is sprayed onto the surface of the gold primer layer and cured and cross-linked by a UV lamp to form a UV primer layer with a thickness of 12μm. The ink for the UV white opaque coating layer is sprayed onto the surface of the UV primer layer and cured and cross-linked by a UV lamp to form a UV opaque coating with a thickness of 18μm. The ink for the UV pattern layer is sprayed onto the surface of the UV opaque coating layer and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a thickness of 15μm. The ink for the UV topcoat layer is sprayed onto the surface of the UV pattern layer and cured and cross-linked by a UV lamp to form a UV topcoat layer with a thickness of 15μm.

[0136] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0137] S2. Apply the acrylic resin coating from step S0 onto the UV topcoat layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s). Bake at 180℃ for 40 minutes to form a golden oil topcoat layer with a thickness of 15μm; thus obtaining a stainless steel cutting board with a colored composite coating, such as... Figure 1 As shown.

[0138] Example 2

[0139] Example 2: A stainless steel drain plate with a colored composite coating was prepared by the following method:

[0140] S0 acrylic resin coating is sprayed onto a local area of ​​the polished stainless steel drain plate surface using a spray gun (parameters: gun distance 58mm, nozzle diameter 1.0mm, spray gun pressure 0.2MPa, speed 0.2m / s). It is then baked at 150℃ for 15min to form a gold oil primer layer with a thickness of 12μm.

[0141] The acrylic resin coating consists of 90 wt% acrylic resin and 10 wt% butyl acetate, and was purchased from Zhejiang Keyoujia New Material Technology Co., Ltd.

[0142] S1. The UV ink printing layers are printed on a Ricoh G6 UV printer. The ink for the UV primer layer is sprayed onto the surface of the gold primer layer and cured and cross-linked by a UV lamp to form a UV primer layer with a thickness of 16μm. The ink for the UV opaque coating layer is sprayed onto the surface of the UV primer layer and cured and cross-linked by a UV lamp to form a UV opaque coating with a thickness of 18μm. The ink for the UV pattern layer is sprayed onto the surface of the UV opaque coating layer and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a thickness of 20μm. The ink for the UV topcoat layer is sprayed onto the surface of the UV pattern layer and cured and cross-linked by a UV lamp to form a UV topcoat layer with a thickness of 12μm.

[0143] During UV curing, the temperature of U1 lamp is 48℃, the temperature of U2 lamp is 48℃, the temperature of V1 lamp is 32℃, and the temperature of V2 lamp is 32℃.

[0144] S2. Apply the acrylic resin coating from step S0 onto the UV topcoat layer using a spray gun (parameters: gun distance 58mm, nozzle diameter 1.0mm, spray gun pressure 0.2MPa, speed 0.2m / s). Bake at 170℃ for 45 minutes to form a golden oil topcoat layer with a thickness of 12μm; thus obtaining a stainless steel drain plate with a colored composite coating, such as... Figure 2 As shown.

[0145] Example 3

[0146] Example 3: A PP overflow cap with a colored composite coating was prepared by the following method:

[0147] S0 and PP coatings are applied to the surface of the PP overflow hole cover and baked at 70℃ for 15 minutes to form a PP coating with a thickness of 15μm.

[0148] The PP coating consists of 60 wt% polypropylene and 40 wt% butyl acetate, and was purchased from Zhejiang Keyoujia New Material Technology Co., Ltd.

[0149] S1. The UV ink printing layers are printed on a Ricoh G6 UV printer. The ink for the UV primer layer is sprayed onto the surface of the PP coating and cured and cross-linked by a UV lamp to form a UV primer layer with a thickness of 15μm. The ink for the UV opaque coating layer is sprayed onto the surface of the UV primer layer and cured and cross-linked by a UV lamp to form a UV opaque coating with a thickness of 15μm. The ink for the UV pattern layer is sprayed onto the surface of the UV opaque coating layer and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a thickness of 18μm. The ink for the UV topcoat layer is sprayed onto the surface of the UV pattern layer and cured and cross-linked by a UV lamp to form a UV topcoat layer with a thickness of 12μm.

[0150] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0151] S2. Apply hydroxyl acrylic resin coating to the UV topcoat layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.4MPa, speed 0.6m / s), and bake at 70℃ for 20 minutes to form a golden oil topcoat layer with a thickness of 15μm; thus obtaining a PP overflow hole cap with a colored composite coating, such as... Figure 3 As shown.

[0152] The hydroxy acrylic resin coating consists of 80 wt% hydroxy acrylic resin and 20 wt% butyl acetate, and was purchased from Zhejiang Keyoujia New Material Technology Co., Ltd.

[0153] Example 4

[0154] The difference between Example 4 and Example 1 is that Example 4 omits step S0 of Example 1, and instead directly sprays the UV primer layer ink onto a localized area of ​​the polished stainless steel cutting board surface. The other steps are the same as in Example 1. The specific steps are as follows:

[0155] S1. The UV ink printing layers are printed on a Ricoh G6 UV printer. The UV primer ink is sprayed onto a localized area of ​​a polished stainless steel cutting board surface and cured and cross-linked by a UV lamp to form a 12μm thick UV primer layer on top of the gold primer layer. The UV opaque coating ink is then sprayed onto the UV primer layer surface and cured and cross-linked by a UV lamp to form a 18μm thick UV opaque coating. The UV pattern layer ink is then sprayed onto the UV opaque coating surface and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a 15μm thickness. Finally, the UV topcoat ink is sprayed onto the UV pattern layer surface and cured and cross-linked by a UV lamp to form a 15μm thick UV topcoat layer.

[0156] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0157] S2. The acrylic resin coating of step S0 in Example 1 is sprayed onto the UV topcoat layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s). The coating is then baked at 180℃ for 40min to form a golden oil topcoat layer with a thickness of 15μm, resulting in a stainless steel cutting board with a colored composite coating.

[0158] Comparative Example 1

[0159] The only difference between Comparative Example 1 and Example 4 is that Comparative Example 1 does not have step S2 of Example 4, while step S1 is the same as that of Example 4.

[0160] Comparative Example 2

[0161] The only difference between Comparative Example 2 and Example 4 is that Comparative Example 2 did not form a UV topcoat layer; otherwise, it was the same as Example 4. The specific steps are as follows:

[0162] S1. The UV ink printing layer is printed on a Ricoh G6 UV printer. The ink for the UV primer layer is sprayed onto a local area of ​​the polished stainless steel cutting board surface and cured and cross-linked by a UV lamp to form a UV primer layer with a thickness of 12μm on the surface of the gold primer layer. The ink for the UV opaque coating layer is sprayed onto the surface of the UV primer layer and cured and cross-linked by a UV lamp to form a UV opaque coating with a thickness of 18μm. The ink for the UV pattern layer is sprayed onto the surface of the UV opaque coating layer and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a thickness of 15μm.

[0163] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0164] S2. The acrylic resin coating of step S0 in Example 1 is sprayed onto the UV pattern layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s). The coating is then baked at 180℃ for 40min to form a gold topcoat layer with a thickness of 15μm, resulting in a stainless steel cutting board with a colored composite coating.

[0165] Comparative Example 3

[0166] The only difference between Comparative Example 3 and Example 4 is that Comparative Example 3 did not form a UV primer layer; otherwise, it is the same as Example 4. The specific steps are as follows:

[0167] S1. Spray the UV opaque coating ink onto a localized area of ​​the polished stainless steel cutting board surface, and cure it with a UV lamp to form a cross-linked film, resulting in a UV opaque coating with a thickness of 18μm; spray the UV pattern layer ink onto the surface of the UV opaque coating, and cure it with a UV lamp to form a cross-linked film, resulting in the desired UV pattern layer with a thickness of 15μm; spray the UV topcoat layer ink onto the surface of the UV pattern layer, and cure it with a UV lamp to form a cross-linked film, resulting in a UV topcoat layer with a thickness of 15μm.

[0168] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0169] S2. The acrylic resin coating of step S0 in Example 1 is sprayed onto the UV topcoat layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s). The coating is then baked at 180℃ for 40min to form a golden oil topcoat layer with a thickness of 15μm, resulting in a stainless steel cutting board with a colored composite coating.

[0170] Comparative Example 4

[0171] The difference between Comparative Example 4 and Example 4 is that the gold oil topcoat layer coating in Comparative Example 4 is a hydroxyl acrylic resin coating, and the specific steps are as follows:

[0172] S1. The UV ink printing layers are printed on a Ricoh G6 UV printer. The UV primer ink is sprayed onto a localized area of ​​a polished stainless steel cutting board surface and cured and cross-linked by a UV lamp to form a 12μm thick UV primer layer on top of the gold primer layer. The UV opaque coating ink is then sprayed onto the UV primer layer surface and cured and cross-linked by a UV lamp to form a 18μm thick UV opaque coating. The UV pattern layer ink is then sprayed onto the UV opaque coating surface and cured and cross-linked by a UV lamp to form the desired UV pattern layer with a 15μm thickness. Finally, the UV topcoat ink is sprayed onto the UV pattern layer surface and cured and cross-linked by a UV lamp to form a 15μm thick UV topcoat layer.

[0173] During UV curing, the temperature of U1 lamp is 50℃, the temperature of U2 lamp is 50℃, the temperature of V1 lamp is 30℃, and the temperature of V2 lamp is 30℃.

[0174] S2. Apply hydroxyl acrylic resin coating to the UV topcoat layer using a spray gun (parameters: gun distance 60mm, nozzle diameter 1.0mm, spray gun pressure 0.3MPa, speed 0.5m / s), and bake at 180℃ for 40min to form a golden oil topcoat layer with a thickness of 15μm; thus obtaining a stainless steel cutting board with a colored composite coating.

[0175] The hydroxy acrylic resin coating consists of 80 wt% hydroxy acrylic resin and 20 wt% butyl acetate, and was purchased from Zhejiang Keyoujia New Material Technology Co., Ltd.

[0176] Performance testing:

[0177] 1. Corrosion resistance: Tested according to the neutral salt spray (NSS) method of GB / T6461, with continuous spraying for 96 hours. After the test, the condition of the coating surface is checked and classified into grades 0-10, with grade 10 being the best performance.

[0178] 2. Coating adhesion: Use a cross-cut tester to forcefully score 1mm squares (10x10) on the coating surface, just enough to cut through the coating. Apply 25mm wide transparent adhesive tape to the scored surface, rub with an eraser, and peel it off vertically within 5 minutes. Check the peeling of the coating. Rating according to GB / T 9286, divided into 6 grades from 0 to 5, with grade 0 being the best performance.

[0179] 3. Hardness: Start the test with a 7H hardness pencil. Push the pencil away from the tester at a 45° angle and a speed of 0.8 mm / s, drawing a line at least 7 mm long. After 30 seconds, visually inspect the surface for scratches. If no scratches appear, increase the pencil hardness until the scratch length is at least 3 mm. If scratches exceed 3 mm, decrease the pencil hardness and repeat the test until no scratches exceed 3 mm on the sample surface. This is the maximum pencil hardness.

[0180] 4. Abrasion Resistance: A wet abrasion test was performed using a repetitive abrasion machine (3M abrasion-free white soft cloth with 1KG pressure applied to the surface) at a frequency of 65 times / minute, for 10,000 cycles. The surface was then inspected for any damage. An additional 5,000 cycles (15,000 cycles) were then performed, again inspecting for wear. This process was repeated until the surface was worn down to the point where the substrate was exposed. The number of abrasion cycles at which the substrate was exposed was recorded.

[0181] Table 1 Performance data of the embodiments and comparative examples

[0182] Corrosion resistance Adhesion hardness abrasion resistance Example 1 Level 10 Level 0 9H 45,000 times Example 2 Level 10 Level 0 9H 45,000 times Example 4 Level 10 Level 1 9H 40,000 times Comparative Example 1 Level 7 Level 1 8H 20,000 times Comparative Example 2 Level 9 Level 1 9H 30,000 times Comparative Example 3 Level 9 Level 2 9H 40,000 times Comparative Example 4 Level 9 Level 1 9H 35,000 times

[0183] As can be seen from Table 1, the composite coatings prepared in Examples 1-2 include: a gold oil primer layer, a UV primer layer, a UV opaque coating layer, a UV pattern layer, a UV topcoat layer, and a gold oil topcoat layer. The synergistic effect between the layers makes the entire composite coating perform well, with strong adhesion, high hardness, excellent corrosion resistance and abrasion resistance. In Example 4, there is no gold oil primer layer, resulting in reduced coating adhesion and fewer abrasion cycles.

[0184] Compared to Example 4, Comparative Example 1, lacking a topcoat layer, exhibited significantly reduced corrosion resistance and abrasion resistance. Comparative Example 2 also showed reduced corrosion resistance and abrasion resistance, though less so than Comparative Example 1. Comparative Example 3, lacking a UV primer layer, suffered reduced adhesion of the UV-printed layer, dropping to level 2. Comparative Example 4, with its topcoat layer formed from hydroxyl acrylic resin, showed decreased corrosion resistance and abrasion resistance.

[0185] In the preparation method of this invention, the order of the steps is not limited to the listed order. For those skilled in the art, variations in the order of the steps without creative effort are also within the scope of protection of this invention. Furthermore, two or more steps or actions can be performed simultaneously.

[0186] Finally, it should be noted that the specific embodiments described herein are merely illustrative examples of the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them; it is neither necessary nor possible to exemplify all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A product with a colored composite coating, characterized in that, It includes a substrate and a colored composite coating attached to the substrate, wherein the colored composite coating includes a UV ink printing layer and a gold oil topcoat layer; The UV ink printing layer comprises, in sequence, a UV primer layer, a UV opaque coating layer, a UV pattern layer, and a UV topcoat layer; The substrate material is one or more of stainless steel, plastic, and glass; When the substrate material is stainless steel or glass, the gold oil topcoat layer is made of acrylic resin coating, which includes: 80-95 wt% acrylic resin Organic solvent 5-20 wt%; When the substrate material is plastic, the gold oil topcoat layer is made of hydroxyl acrylic resin coating, which includes: 70-90 wt% hydroxyl acrylic resin Organic solvent 10-30 wt%.

2. The product with a colored composite coating according to claim 1, characterized in that, The inks that form the UV primer and UV topcoat layers contain the following components: 4-(1-oxo-2-propenyl)morpholine: 25-30 wt%; 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%; 2-Methyl 2-acrylate (tetrahydro-2-furanyl) ester: 20-25 wt%; Polyacrylic acid: 5-15 wt%; Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

3. A product with a colored composite coating according to claim 1, characterized in that, The inks that form the UV opaque coating are white, yellow, red, blue, or black inks. The inks that form the UV pattern layer include: yellow ink, red ink, blue ink, and black ink; White ink contains titanium dioxide; Black ink includes black pigments: carbon black; The red ink contains a red pigment: 5,12-dihydro-2,9-dimethylquinolino[2,3-b]acridin-7,14-dione; Yellow ink contains yellow pigment: 5,5'-azobis-2,4,6-(1H,3H,5H)pyrimidinetrione nickel complex; Blue ink includes a blue pigment: phthalocyanine blue.

4. A product with a colored composite coating according to claim 3, characterized in that, White ink Includes the following ingredients: 2-Propionic acid-(5-ethyl-1,3-dioxane-5-yl)methyl ester: 15-30 wt%; 4-(1-oxo-2-propenyl)morpholine: 25-30 wt%; 2-Methyl acrylate (tetrahydro-2-furanyl) ester: 15-20 wt%; Titanium dioxide: 5-15 wt%; Polyacrylic acid: 5-15 wt%; Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide: 5-10 wt%.

5. A product with a colored composite coating according to claim 1, characterized in that, When the substrate material is stainless steel or glass, a gold oil primer layer is also included between the substrate and the UV primer layer, and the gold oil primer layer is made of the acrylic resin coating. When the substrate material is plastic, a PP coating is also included between the substrate and the UV primer layer. The PP coating is made of the following PP coating: Polypropylene (PP) 50-70 wt%, Organic solvent 30-50 wt%.

6. The preparation process of a product with a colored composite coating as described in claim 1, characterized in that, Includes the following steps: S1. Spray the ink of the UV primer layer onto the substrate surface and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer. The ink for the UV pattern layer is sprayed onto the surface of the UV opaque coating and cured by a UV lamp to form the UV pattern layer; The ink for the UV topcoat layer is sprayed onto the surface of the UV pattern layer and cured by a UV lamp to form the UV topcoat layer; S2. Spray acrylic resin coating or hydroxyl acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

7. The preparation process according to claim 6, characterized in that, When the substrate material is stainless steel or glass, the preparation process includes the following steps: S0. Apply acrylic resin coating to the substrate to form a gold oil primer layer; S1. Spray the ink of the UV primer layer onto the surface of the gold oil primer layer and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer; spray the ink of the UV pattern layer onto the surface of the UV opaque coating layer and cure it with a UV lamp to form a UV pattern layer; spray the ink of the UV topcoat layer onto the surface of the UV pattern layer and cure it with a UV lamp to form a UV topcoat layer. S2. Spray acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

8. The preparation process according to claim 7, characterized in that, During the spraying process in steps S0 and S2, the gun distance is 40-80mm, the nozzle diameter is 0.6-1.5mm, the spray gun pressure is 0.1-1.0MPa, and the speed is 0.1-1m / s; The baking temperature in step S0 is 120–160°C, and the baking time is 5–40 min. In step S2, after spraying the acrylic resin coating, the baking temperature is 150-200℃ and the baking time is 20-70 minutes.

9. The preparation method according to claim 6, characterized in that, When the substrate material is plastic, the preparation process includes the following steps: S0. Apply PP coating to the substrate to form a PP coating layer; S1. Spray the ink of the UV primer layer onto the surface of the PP coating and cure it with a UV lamp to form a UV primer layer on the substrate surface; spray the ink of the UV opaque coating layer onto the surface of the UV primer layer and cure it with a UV lamp to form a UV opaque coating layer; spray the ink of the UV pattern layer onto the surface of the UV opaque coating layer and cure it with a UV lamp to form a UV pattern layer; spray the ink of the UV topcoat layer onto the surface of the UV pattern layer and cure it with a UV lamp to form a UV topcoat layer. S2. Spray hydroxyl acrylic resin coating onto the UV topcoat layer and bake to form a golden oil topcoat layer.

10. The preparation method according to claim 9, characterized in that, During the spraying process in step S2, the gun distance is 40-80mm, the nozzle diameter is 0.6-1.5mm, the spray gun pressure is 0.1-1.0MPa, and the speed is 0.1-1m / s; The baking conditions for steps S0 and S2 are: baking temperature of 60-80℃ and baking time of 10-40min.

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