Optical coating rubbing coating as well as preparation method and application thereof

Abstract

The invention discloses an optical coating rubbing coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The coating comprises a first treating agent layer, a colored paint coating layer, a UV primer layer, an optical coating layer, a second treating agent layer, a PU intermediate paint layer, a gold stamping layer, a third treating agent layer and a UV finish paint layer. The structure of the optical coating layer is five, and the material of the optical coating layer comprises silicon dioxide, lithium sesquioxide, silicon dioxide, lithium sesquioxide and silicon dioxide metal overlapped coating layers which are sequentially coated on the UV primer layer. The preparation method of the coating comprises the following steps: sequentially spraying the first treating agent layer, the colored paint coating layer and the UV primer layer on the surface of the base material, carrying out optical coating, continuously spraying the second treating agent layer and the PU intermediate paint layer, carrying out gold stamping treatment, continuously spraying the third treating agent layer and the UV finish paint layer. Through the synergistic effect of different components, the adhesive force of the coating is improved, and meanwhile the coating has the good metal texture and the high-texture visual effect.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to an optical coating rubbing coating and a preparation method and application thereof. Background Art

[0002] At present, the mobile phone battery cover on the market adopts the process of PC plastic shell spraying, but the metal texture of the product is not strong enough, and the appearance effect presented cannot achieve the high texture and brightening effect of optical plating. Epoxy glass fiber is an important fiber reinforced plastic material. Compared with PC plastic, it has the characteristics of light weight, high strength and strong corrosion resistance. However, because there are cloth patterns on epoxy glass fiber materials, compared with PC materials, the coating needs to have better covering power to cover the cloth pattern print.

[0003] Optical plating rubbing coating can be applied to all brands of mobile phone battery cover materials to make products that meet the requirements of optical plating rubbing process. The superposition of double rubbing process and optical plating has rich appearance effects. The existing optical coating process has certain technical bottlenecks in multi-layer superposition and rubbing of different textures, such as insufficient adhesion between coatings, uneven coating, unstable appearance effect and other problems. In addition, it is often difficult to simultaneously ensure the adhesion, transparency and durability of the coating when optical coating is performed after spraying the treatment agent on the surface of the substrate.

[0004] Therefore, it is of great significance to provide an optical coating rubbing coating to solve the problem of insufficient coating adhesion, improve the stability of the optical coating layer, and at the same time have good metallic texture and high-quality visual effects. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an optical coating rubbing coating, which is applied to epoxy glass fiber board and has good coating bonding force and metallic texture.

[0006] The invention also provides a method for preparing the optical film-plating rubbing coating.

[0007] The invention also provides an application of the optical film-coating rubbing paint.

[0008] A first aspect of the present invention provides an optical coating rubbing coating, the coating comprising a treatment agent 1 layer, a color paint coating layer, a UV primer layer, an optical coating layer, a treatment agent 2 layer, a PU intermediate paint layer, a hot stamping layer, a treatment agent 3 layer, and a UV topcoat layer;

[0009] The optical coating layer has a five-layer structure, and the coating layers of silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal superposition are alternately coated on the UV primer layer in sequence.

[0010] The optical film-coating rubbing coating according to the first embodiment of the present invention has at least the following beneficial effects:

[0011] The present invention enhances the bonding force between the coatings by using a variety of treatment agents in combination, especially the bonding effect of treatment agent 1 and epoxy glass fiber sheet is significant, and treatment agents 2 and 3 further enhance the adhesion of the coating layer and the outer coating, ensuring the stability and durability of the coating. In addition, the main function of spraying color paint is to adjust the color effect of the product and provide coverage for cloth texture printing; spraying optical UV-plated primer coating and making bottom texture rubbings to improve the flatness of the bottom layer, and it is necessary to rub the UV primer to make different texture effects; spraying treatment agent 2 coating on the optical coating to provide the bonding force between the coating and the silicon dioxide metal layer; spraying PU intermediate paint coating to buffer the shrinkage of the topcoat to treatment agent 2, thereby ensuring the bonding force between treatment agent 2 and the metal layer; spraying treatment agent 3 coating to provide the adhesion of the topcoat coating and hot stamping; spraying optical UV-plated topcoat coating and making outer texture rubbings to provide protection for other coatings, and it is necessary to rub the UV topcoat to make different sandy effects.

[0012] The present invention adopts a metal coating structure of alternately stacked silicon dioxide and lithium oxide, which has good metallic texture, not only giving the coating uniform high reflectivity and transparency, but also making the coating have good durability and aesthetics, avoiding the problem of uneven coating or stratification in existing processes.

[0013] The present invention solves the problem of insufficient coating adhesion and improves the stability of the optical coating layer by using the coordinated use of treatment agent 1, color paint, UV primer, optical coating material, treatment agent 2, PU intermediate paint, treatment agent 3, and UV topcoat, while having good metallic texture and high-quality visual effects.

[0014] Silicon dioxide and lithium trioxide are chemically stable and do not react with most acids and alkalis. At the same time, both are non-conductive materials with very low electrical conductivity, which does not affect the transmission of mobile phone signals. The refractive index of silicon dioxide is about 1.46, and the transmittance is high enough in optical coatings.

[0015] According to some embodiments of the present invention, the raw materials of the treatment agent 1 include, by mass percentage: 20%-30% hydroxyl acrylic resin (DIC1063), 20%-30% thermoplastic acrylic resin (Mitsubishi Chemical 7615), 5%-10% cellulose resin (CAB381-0.5), 20%-30% color paste (self-grinding), 2%-30% adhesion promoter (LTW), and 20%-30% solvent butyl acetate.

[0016] According to some embodiments of the present invention, the raw materials for preparing the treatment agent layer 1 further include a curing agent and a diluent.

[0017] According to some embodiments of the present invention, the volume ratio of the treating agent 1, the curing agent, and the diluent is 100:10:150-200.

[0018] According to some embodiments of the present invention, the raw materials for preparing the colored paint coating layer include, by mass percentage: 30%-40% hydroxylated acrylic resin (DIC1063), 5%-10% modified hydroxylated acrylic polymer (HD-2588A of Xiyu Chemical Industry), 20%-30% color paste, 2%-3% adhesion promoter, and 20%-30% solvent butyl acetate.

[0019] According to some embodiments of the present invention, the raw materials for preparing the color paint coating layer also include a curing agent and a diluent.

[0020] According to some embodiments of the present invention, the volume ratio of the paint coating, the curing agent and the diluent is 100:5:120-150.

[0021] According to some embodiments of the present invention, the raw materials of the treatment agent 2 include, by mass percentage: modified hydroxyl acrylic polymer (Mitsui Chemicals XP11B) 20%-30%, thermoplastic acrylic resin (AP425 from Jiadian Chemical) 2%-3%, leveling agent (BYK358N) 0.1%-0.2%, silane coupling agent (Dow Corning 6040) 0.5%-1%, solvent butyl acetate 30%-40%, solvent ethyl acetate 30%-40%.

[0022] The optical contact coating is supplemented with silane coupling agent to enhance the bite of the coating and the plating. The adhesion principle of silane coupling agent is: silane migrates to the interface between the coating and the plating, reacts with the moisture on the inorganic surface, hydrolyzes to form silanol groups, and then forms hydrogen bonds with the surface hydroxyl groups of the plating. During the heating and curing process, it is accompanied by a dehydration reaction to form a covalent bond with the plating.

[0023] According to some embodiments of the present invention, the raw materials for preparing the treatment agent 2 layer also include a curing agent.

[0024] According to some embodiments of the present invention, the volume ratio of the treatment agent 2 to the curing agent is 100:0.5.

[0025] According to some embodiments of the present invention, the raw materials of the treatment agent 3 include, by mass percentage: 20%-30% hydroxy acrylic polymer (Mitsui Chemicals Q857), 0.1%-0.2% leveling agent (BYK358N), 30%-40% solvent butyl acetate, and 30%-40% solvent ethyl acetate.

[0026] According to some embodiments of the present invention, the raw materials for preparing the treatment agent 3 layer also include a curing agent.

[0027] According to some embodiments of the present invention, the volume ratio of the treating agent 3 to the curing agent is 100:2.

[0028] According to some embodiments of the present invention, the components of the PU mid-coat include, by mass percentage, 20%-30% modified hydroxyl acrylic polymer (Xiyu Chemical HD-2960), 5%-10% high molecular weight acrylate (Mitsubishi Chemical N-6803), 0.1%-0.2% leveling agent (BYK358N), 0.5%-1% silane coupling agent (Dow Corning 6040), 30%-40% solvent butyl acetate, and 30%-40% solvent ethyl acetate.

[0029] According to some embodiments of the present invention, the raw materials for preparing the PU intermediate paint layer also include a curing agent and a diluent.

[0030] According to some embodiments of the present invention, the volume ratio of the PU intermediate paint, the curing agent, and the diluent is 100:5:100-150.

[0031] According to some embodiments of the present invention, the raw materials of the UV primer are, by mass percentage, 2%-3% initiator, 15%-20% solvent-based polyurethane resin (Changxing 6071), 5%-10% hexafunctional polyurethane resin (Changxing 6145-100), 10%-15% difunctional polycarbonate resin (Sartomer 9001), 5%-10% trifunctional monomer TMPTA, 20-30% solvent ethyl ester, 10-20% solvent butyl ester, 10-20% solvent n-butanol, 10-20% solvent acetone, and 0.1%-0.3% leveling agent.

[0032] According to some embodiments of the present invention, the raw materials of the UV topcoat are, by mass percentage, 3%-4% initiator, 15%-20% solvent-based polyurethane resin (Changxing 6071), 15%-20% nine-official polyurethane resin (Boxing B-919), 10%-15% tri-official polyurethane resin (Corning 6008), 5%-10% hexa-official monomer DPHA, 20-30% solvent ethyl ester, 10-20% solvent butyl ester, 10-20% solvent methyl isobutyl ketone, 10-20% solvent ethylene glycol butyl ether, 0.1%-0.3% leveling agent, and 1%-2% ultraviolet absorber.

[0033] The second aspect of the present invention provides a method for preparing the above-mentioned optical coating rubbing coating, characterized in that it includes optical coating and rubbing processes, and the steps include:

[0034] Spray one layer of treatment agent, a color paint layer, and a UV primer layer on the surface of the substrate in sequence for optical coating, then spray two layers of treatment agent and a PU middle paint layer for hot stamping, then spray three layers of treatment agent and a UV topcoat layer to obtain an optical coating rubbing coating.

[0035] According to some embodiments of the present invention, the coating thickness of the treatment agent 1 coating is 6-10 μm.

[0036] According to some embodiments of the present invention, the coating thickness of the color paint is 15-25 μm.

[0037] According to some embodiments of the present invention, the coating thickness of the UV primer coating is 15-25 μm.

[0038] According to some embodiments of the present invention, the coating film thickness of the optical coating is 200-400 nm.

[0039] According to some embodiments of the present invention, the coating thickness of the treatment agent 2 coating is 2-5 μm.

[0040] According to some embodiments of the present invention, the coating thickness of the PU mid-coat coating is 5-10 μm.

[0041] According to some embodiments of the present invention, the coating thickness of the treatment agent 3 coating is 2-4 μm.

[0042] According to some embodiments of the present invention, the coating thickness of the UV topcoat coating is 15-25 μm.

[0043] According to some embodiments of the present invention, the specific steps of the preparation method include:

[0044] D1. Spraying the treatment agent 1 on the surface of the substrate, and baking and curing to obtain a coating of the treatment agent 1;

[0045] D2. Spraying paint on the surface of the coating of the treatment agent 1, and baking and curing to obtain a paint coating;

[0046] D3 spraying UV primer on the paint surface, LED lamp curing and rubbing after baking, and then mercury lamp curing to obtain UV primer coating;

[0047] D4. performing optical coating on the primer to obtain an optical coating layer;

[0048] D5. Spraying the treatment agent 2 on the optical coating layer, and baking and curing to obtain a treatment agent coating 2;

[0049] D6 spray PU paint on the treatment agent 2, and bake and cure to obtain a PU paint coating;

[0050] D7. Hot stamping on the PU lacquer coating to obtain a hot stamping LOGO layer;

[0051] D8. Spray treatment 3 on the product after hot stamping, and bake and cure to obtain a coating of treatment agent 3;

[0052] D9. Spray UV topcoat on the surface of the treatment agent 3, cure with LED light after baking and print, and then cure with mercury lamp to obtain UV topcoat coating.

[0053] According to some embodiments of the present invention, in step D1, the treatment agent 1: curing agent: diluent = 100:10:150-200, the evenly stirred product is sprayed on the product, the leveling temperature is 70-80°C, and the leveling time is 10-15 minutes.

[0054] According to some embodiments of the present invention, in step D2, the uniformly stirred product of the color paint coating: curing agent: diluent = 100:5:120-150 is sprayed on the product, the leveling temperature is 70-80°C, and the leveling time is 10-15 minutes.

[0055] According to some embodiments of the present invention, in step D3, the leveling temperature is 55-60°C, the leveling time is 5-8 minutes, and the LED light energy is 300-500mJ / cm 2 , the energy of mercury lamp is 720-880mJ / cm2.

[0056] According to some embodiments of the present invention, in step D5, the product of treatment agent 2: curing agent = 100:0.5 stirred evenly is sprayed on the product at a temperature of 70-80°C, the leveling time is 10-15 minutes, and the film thickness is 2-5 μm.

[0057] According to some embodiments of the present invention, in step D6, the PU intermediate paint: curing agent: diluent = 100:5:100-150 is evenly stirred and sprayed on the product, the leveling temperature is 55-60°C, and the leveling time is 5-8 minutes.

[0058] According to some embodiments of the present invention, in step D7, the hot stamping layer consists of an adhesive layer + an aluminum layer + a coloring layer + a peeling layer + a PET film.

[0059] According to some embodiments of the present invention, in step D8, the product of treating agent 3: curing agent = 100:2 is evenly stirred and sprayed on the product, the leveling temperature is 55-60° C., and the leveling time is 5-8 min.

[0060] According to some embodiments of the present invention, in step D9, the leveling temperature is 55-60°C, the leveling time is 5-8 min, the film thickness is 15-25 μm, and the LED light energy is 200-400 mJ / cm 2 , the energy of mercury lamp is 900-1100mJ / cm2.

[0061] According to some embodiments of the present invention, the substrate is an epoxy glass fiber board.

[0062] If there is no special explanation, the actual meaning of “about” in the present invention is that the error is allowed to be within the range of ±2%, for example, about 100 is actually 100±2%×100.

[0063] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0064] The embodiments of the present invention are described in detail below, and the same or similar reference numerals throughout the embodiments represent the same or similar elements or elements with the same or similar functions. The embodiments described below are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0065] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0066] The words "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that may provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0067] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0068] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0069] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0070] Example 1

[0071] This embodiment provides an optical coating rubbing coating, and the components of the coating include, by mass percentage:

[0072] Treatment agent 1 (its composition is 20% hydroxy acrylic resin, 30% thermoplastic acrylic resin, 5% cellulose resin, 20% color paste, 2% adhesion promoter, 23% solvent butyl acetate), the coating thickness is 6-10 μm;

[0073] Color paint (its composition is 30% of hydroxy acrylic resin, 10% of modified hydroxy acrylic polymer, 27% of color paste, 3% of adhesion promoter, and 30% of solvent butyl acetate), the coating thickness is 15-25 μm;

[0074] UV primer (its composition is 3% initiator, 20% solvent-based polyurethane resin, 5% hexafunctional polyurethane resin, 12% difunctional polycarbonate resin, 5% trifunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent n-butanol, 14.7% solvent acetone, 0.3% leveling agent), the coating thickness is 15-25μm;

[0075] The optical coating has a five-layer structure, which is a coating layer composed of silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal superposition.

[0076] Treatment agent 2 (its composition is 20% of modified hydroxy acrylic polymer, 2% of thermoplastic acrylic resin, 0.2% of leveling agent, 0.8% of silane coupling agent, 40% of solvent butyl acetate, and 37% of solvent ethyl acetate), the coating thickness is 2-5 μm;

[0077] PU mid-coat (its composition is 20% modified hydroxy acrylic polymer, 10% high molecular weight acrylate, 0.2% leveling agent, 0.8% silane coupling agent, 30% solvent butyl acetate, 39% solvent ethyl acetate), the coating thickness is 5-10μm;

[0078] Treatment agent 3 (its composition is 20% hydroxy acrylic polymer, 0.1% leveling agent, 40% solvent butyl acetate, 39.9% solvent ethyl acetate), the coating thickness is 2-4 μm;

[0079] UV topcoat (whose composition is 3% initiator, 15% solvent-based polyurethane resin, 15.9% nonafunctional polyurethane resin, 10% triafunctional polyurethane resin, 5% hexafunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent methyl isobutyl ketone, 10% solvent ethylene glycol butyl ether, 0.1% leveling agent, 1% ultraviolet absorber), the coating thickness is 15-25μm.

[0080] This embodiment also provides an application of the above optical coating rubbing paint, and the specific application process includes:

[0081] S100, spray the product mixed evenly with treatment agent 1: curing agent: diluent = 100:10:200 on the epoxy glass fiber material, with a coating film thickness of 6-10μm, and level it at 80℃ for 15 minutes;

[0082] S200, spray the product evenly mixed with paint: curing agent: diluent = 100:5:150 on the product, with a coating film thickness of 15-25μm, and level it at 80℃ for 15 minutes;

[0083] S300, spray UV primer, coating film thickness 15-25μm, leveling at 60℃ for 5 minutes and then 300-500mj / cm 2 It is cured under LED energy to create a rubbing texture effect, and finally cured under a mercury lamp at an energy of 720-880mJ / cm2.

[0084] S400, optical coating: a coating layer of silicon dioxide + lithium oxide + silicon dioxide + lithium oxide + silicon dioxide metal superposition.

[0085] S500, spray the product evenly mixed with treatment agent 2: curing agent = 100:0.5 on the product, with a coating film thickness of 2-5μm, and level it at 80℃ for 15 minutes;

[0086] S600, spray the product evenly mixed with PU intermediate paint: curing agent: diluent = 100:5:100-150 on the product, with a coating film thickness of 5-10μm, and level it at 60℃ for 5 minutes;

[0087] S700, hot stamping process;

[0088] S800, spray the product evenly mixed with treatment agent 3 and curing agent = 100:2 on the product, with a coating film thickness of 2-4μm, and level it at 60℃ for 5 minutes;

[0089] S900, spray UV topcoat, coating film thickness 15-25μm, leveling at 60℃ for 5 minutes and then 200-400mj / cm 2It is cured under LED energy to create a sandy effect, and finally cured with a mercury lamp under an energy of 900-1100mJ / cm2.

[0090] Example 2

[0091] This embodiment provides an optical coating rubbing paint, which is different from the embodiment in that, in terms of mass percentage, the components of the paint include:

[0092] Treatment agent 1 (its composition is 30% of hydroxy acrylic resin, 20% of thermoplastic acrylic resin, 5% of cellulose resin, 20% of color paste, 2% of adhesion promoter, and 23% of solvent butyl acetate), the coating thickness is 6-10 μm;

[0093] Color paint (its composition is 30% of hydroxy acrylic resin, 10% of modified hydroxy acrylic polymer, 27% of color paste, 3% of adhesion promoter, and 30% of solvent butyl acetate), the coating thickness is 15-25 μm;

[0094] UV primer (its composition is 3% initiator, 20% solvent-based polyurethane resin, 5% hexafunctional polyurethane resin, 12% difunctional polycarbonate resin, 5% trifunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent n-butanol, 14.7% solvent acetone, 0.3% leveling agent), the coating thickness is 15-25μm;

[0095] The optical coating has a five-layer structure, which is a coating layer composed of silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal superposition.

[0096] Treatment agent 2 (its composition is 20% of modified hydroxy acrylic polymer, 2% of thermoplastic acrylic resin, 0.2% of leveling agent, 0.8% of silane coupling agent, 40% of solvent butyl acetate, and 37% of solvent ethyl acetate), the coating thickness is 2-5 μm;

[0097] PU mid-coat (its composition is 20% modified hydroxy acrylic polymer, 10% high molecular weight acrylate, 0.2% leveling agent, 0.8% silane coupling agent, 30% solvent butyl acetate, 39% solvent ethyl acetate), the coating thickness is 5-10μm;

[0098] Treatment agent 3 (its composition is 20% hydroxy acrylic polymer, 0.1% leveling agent, 40% solvent butyl acetate, 39.9% solvent ethyl acetate), the coating thickness is 2-4 μm;

[0099] UV topcoat (whose composition is 3% initiator, 15% solvent-based polyurethane resin, 15.9% nonafunctional polyurethane resin, 10% triafunctional polyurethane resin, 5% hexafunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent methyl isobutyl ketone, 10% solvent ethylene glycol butyl ether, 0.1% leveling agent, 1% ultraviolet absorber), the coating thickness is 15-25μm.

[0100] Example 3

[0101] This embodiment provides an optical coating rubbing paint, which is different from the embodiment in that, in terms of mass percentage, the components of the paint include:

[0102] Treatment agent 1 (its composition is 20% hydroxy acrylic resin, 30% thermoplastic acrylic resin, 5% cellulose resin, 20% color paste, 2% adhesion promoter, 23% solvent butyl acetate), the coating thickness is 6-10 μm;

[0103] Color paint (its composition is 30% of hydroxy acrylic resin, 10% of modified hydroxy acrylic polymer, 27% of color paste, 3% of adhesion promoter, and 30% of solvent butyl acetate), the coating thickness is 15-25 μm;

[0104] UV primer (its composition is 3% initiator, 17% solvent-based polyurethane resin, 5% hexafunctional polyurethane resin, 15% difunctional polycarbonate resin, 5% trifunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent n-butanol, 14.7% solvent acetone, 0.3% leveling agent), the coating thickness is 15-25μm;

[0105] The optical coating has a five-layer structure, which is a coating layer composed of silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal superposition.

[0106] Treatment agent 2 (its composition is 20% of modified hydroxy acrylic polymer, 2% of thermoplastic acrylic resin, 0.2% of leveling agent, 0.8% of silane coupling agent, 40% of solvent butyl acetate, and 37% of solvent ethyl acetate), the coating thickness is 2-5 μm;

[0107] PU mid-coat (its composition is 20% modified hydroxy acrylic polymer, 10% high molecular weight acrylate, 0.2% leveling agent, 0.8% silane coupling agent, 30% solvent butyl acetate, 39% solvent ethyl acetate), the coating thickness is 5-10μm;

[0108] Treatment agent 3 (its composition is 20% hydroxy acrylic polymer, 0.1% leveling agent, 40% solvent butyl acetate, 39.9% solvent ethyl acetate), the coating thickness is 2-4 μm;

[0109] UV topcoat (whose composition is 3% initiator, 15% solvent-based polyurethane resin, 15.9% nonafunctional polyurethane resin, 10% triafunctional polyurethane resin, 5% hexafunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent methyl isobutyl ketone, 10% solvent ethylene glycol butyl ether, 0.1% leveling agent, 1% ultraviolet absorber), the coating thickness is 15-25μm.

[0110] Example 4

[0111] This embodiment provides an optical coating rubbing paint, which is different from the embodiment in that, in terms of mass percentage, the components of the paint include:

[0112] Treatment agent 1 (its composition is 20% hydroxy acrylic resin, 30% thermoplastic acrylic resin, 5% cellulose resin, 20% color paste, 2% adhesion promoter, 23% solvent butyl acetate), the coating thickness is 6-10 μm;

[0113] Color paint (its composition is 30% of hydroxy acrylic resin, 10% of modified hydroxy acrylic polymer, 27% of color paste, 3% of adhesion promoter, and 30% of solvent butyl acetate), the coating thickness is 15-25 μm;

[0114] UV primer (its composition is 3% initiator, 20% solvent-based polyurethane resin, 5% hexafunctional polyurethane resin, 12% difunctional polycarbonate resin, 5% trifunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent n-butanol, 14.7% solvent acetone, 0.3% leveling agent), the coating thickness is 15-25μm;

[0115] The optical coating has a five-layer structure, which is a coating layer composed of silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal superposition.

[0116] Treatment agent 2 (its composition is 20% of modified hydroxy acrylic polymer, 2% of thermoplastic acrylic resin, 0.2% of leveling agent, 0.8% of silane coupling agent, 40% of solvent butyl acetate, and 37% of solvent ethyl acetate), the coating thickness is 2-5 μm;

[0117] PU mid-coat (its composition is 25% modified hydroxy acrylic polymer, 5% high molecular weight acrylate, 0.2% leveling agent, 0.8% silane coupling agent, 30% solvent butyl acetate, 39% solvent ethyl acetate), the coating thickness is 5-10μm;

[0118] Treatment agent 3 (its composition is 20% hydroxy acrylic polymer, 0.1% leveling agent, 40% solvent butyl acetate, 39.9% solvent ethyl acetate), the coating thickness is 2-4 μm;

[0119] UV topcoat (whose composition is 3% initiator, 15% solvent-based polyurethane resin, 15.9% nonafunctional polyurethane resin, 10% triafunctional polyurethane resin, 5% hexafunctional monomer, 20% solvent ethyl ester, 10% solvent butyl ester, 10% solvent methyl isobutyl ketone, 10% solvent ethylene glycol butyl ether, 0.1% leveling agent, 1% ultraviolet absorber), the coating thickness is 15-25μm.

[0120] The coating optical coating rubbing coating schemes of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1. The coatings used in Comparative Examples 1 to 4 are consistent with those in Example 1.

[0121] Table 1: Coating scheme for optical coating rubbing of Example 1 and Comparative Examples 1 to 4

[0122] Comparative Example 1 Color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat Comparative Example 2 Treatment agent 1 + color paint + UV primer + optical coating + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat Comparative Example 3 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + hot stamping + treatment agent 3 + UV topcoat Comparative Example 4 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + UV topcoat Example 1 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat Example 2 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat Example 3 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat Example 4 Treatment agent 1 + color paint + UV primer + optical coating + treatment agent 2 + PU intermediate paint + hot stamping + treatment agent 3 + UV topcoat

[0123] Test Case

[0124] The above-mentioned Examples 1 to 4 and Comparative Examples 1 to 4 were subjected to a 100-degree boiling test, and the test method was as follows:

[0125] 1) Before testing, check the product appearance to see if there is any discoloration, bubbles, cracks, or shedding, and wipe the surface of the sample clean with a dust-free cloth;

[0126] 2) Heat the purified water to 100°C and put the product into the water bath, making sure that the product does not overlap, collide or directly contact the heating rod;

[0127] 3) The water bath time is 6 hours. After the test is completed, it is naturally cooled to room temperature.

[0128] Testing standards: 1) After boiling, the sample is left standing at room temperature for 120 minutes before inspection. If there is no irreversible change in appearance, it is judged as OK, otherwise it is NG. At the same time, it should be ensured that the paint coating is not allowed to wrinkle or fall off under any circumstances during and after the boiling process; 2) After standing at room temperature for 120 minutes, an adhesion test is carried out, and the product adhesion is required to reach 3B and above; 3) After the test, the maximum diameter of the newly added bubble points is used as the judgment basis. When the point diameter is less than D < 0.1 (S < 0.008), it is negligible, but when it is localized in large quantities, it is unacceptable. The bubble point diameter is 0.5 ≥ D ≥ 0.1, and more than 2 are unacceptable; the bubble point diameter D > 0.5 is unacceptable;

[0129] The test results of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 2.

[0130] Table 2 Test results of Examples 1 to 4 and Comparative Examples 1 to 4

[0131]

[0132]

[0133] It can be seen that the present invention solves the problem of insufficient coating adhesion by using the coordinated use of treatment agent 1, color paint, UV primer, optical coating material, treatment agent 2, PU intermediate paint, treatment agent 3, and UV topcoat.

[0134] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. An optical coating rubbing coating, characterized in that: The coating comprises a treatment agent layer 1, a color paint coating layer, a UV primer layer, an optical coating layer, a treatment agent layer 2, a PU intermediate paint layer, a hot stamping layer, a treatment agent layer 3, and a UV topcoat layer; The optical coating layer has a five-layer structure, including a coating layer in which silicon dioxide, lithium trioxide, silicon dioxide, lithium trioxide, and silicon dioxide metal are superimposed and coated in sequence on a UV primer layer.

2. The optical coating rubbing coating according to claim 1, characterized in that: In terms of mass percentage, the raw materials for preparing the first layer of the treating agent include: 20%-30% hydroxy acrylic resin, 20%-30% thermoplastic acrylic resin, 5%-10% cellulose resin, 20%-30% color paste, and 2%-3% adhesion promoter; preferably, the raw materials for preparing the first layer of the treating agent also include a curing agent and a diluent.

3. The optical coating rubbing coating according to claim 1, characterized in that: In terms of mass percentage, the raw materials for preparing the second layer of the treatment agent include: 20%-30% modified hydroxyl acrylic polymer, 2%-3% thermoplastic acrylic resin, 0.1%-0.2% leveling agent, and 0.5%-1% silane coupling agent; preferably, the raw materials for preparing the second layer of the treatment agent also include a curing agent.

4. The optical coating rubbing coating according to claim 1, characterized in that: In terms of mass percentage, the raw materials for preparing the third layer of the treatment agent include: 20%-30% of hydroxy acrylic polymer and 0.1%-0.2% of leveling agent; preferably, the raw materials for preparing the third layer of the treatment agent also include a curing agent and a diluent.

5. The optical film rubbing coating according to claim 1, characterized in that: In terms of mass percentage, the raw materials for preparing the PU middle paint layer include 20%-30% modified hydroxy acrylic polymer, 5%-10% high molecular weight acrylate, 0.1%-0.2% leveling agent, and 0.5%-1% silane coupling agent; preferably, the raw materials for preparing the PU middle paint layer also include a curing agent and a diluent.

6. A method for preparing an optical coating rubbing coating according to any one of claims 1 to 5, characterized in that: Including optical coating and rubbing process, the steps include: Spray one layer of treatment agent, a color paint layer, and a UV primer layer on the surface of the substrate in sequence for optical coating, then spray two layers of treatment agent and a PU middle paint layer for hot stamping, then spray three layers of treatment agent and a UV topcoat layer to obtain an optical coating rubbing coating.

7. The preparation method according to claim 6, characterized in that: The thickness of the treatment agent 1 layer is 6-10μm; preferably, the coating thickness of the color paint layer is 15-25μm; preferably, the coating thickness of the UV primer layer is 15-25μm; preferably, the film thickness of the optical coating layer is 200-400nm; preferably, the coating thickness of the treatment agent 2 layer is 2-5μm; preferably, the coating thickness of the PU middle paint layer is 5-10μm; preferably, the coating thickness of the treatment agent 3 layer is 2-4μm; preferably, the coating thickness of the UV topcoat layer is 15-25μm.

8. The preparation method according to claim 7, characterized in that: The substrate is an epoxy glass fiber sheet.

9. The preparation method according to claim 7, characterized in that: The hot stamping layer comprises an adhesive layer, an aluminum layer, a coloring layer, a peeling layer and a PET film.

10. A mobile phone battery cover made of epoxy glass fiber sheet material, characterized in that: It comprises an epoxy glass fiber sheet and the optical coating rubbing coating according to any one of claims 1 to 6.

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