Colored paint film with liquid metal effect, coating structure and preparation method of colored paint film

Abstract

The invention relates to the technical field of coating processes, in particular to a coating structure with a liquid metal effect and a preparation method of the coating structure. The colored paint film comprises the following raw materials in parts by weight: 0-20 parts of pigment and 2-7 parts of aluminum powder; the aluminum powder is in the shape of silver yuan, and the mass ratio of fine-particle-size aluminum powder to aluminum powder in the aluminum powder is larger than or equal to 0.5; the particle size of the fine-particle-size aluminum powder is less than or equal to The weight part of the pigment is controlled to be 0-20 parts generally, and the mass part of the aluminum powder is controlled to be 2-7 parts generally, so that a colored paint film shows a better liquid metal effect; in addition, the shape of the aluminum powder can be silver yuan, the mass ratio of the aluminum powder with the fine particle size to the aluminum powder in the aluminum powder is generally larger than or equal to 0.5, the small-particle aluminum powder can be promoted to be evenly arranged, the twinkling feeling of the colored paint film is improved, meanwhile, the granular feeling of the colored paint film is reduced, and therefore the liquid metal effect of the colored paint film can be improved, and the service life of the colored paint film is prolonged. Therefore, the colored paint film has the characteristics of high brightness in the front view and low brightness in the side view.

Description

Technical Field

[0001] The present application relates to the technical field of coating processes, and in particular to a coating structure with a liquid metal effect and a preparation method thereof. Background Art

[0002] Among the many car exterior colors, liquid metal silver is a unique and eye-catching body color. Based on the gloss and reflection effect of liquid metal silver, some simple and smooth lines or geometric textures will appear on the body under the reflection of light. These unique metallic textures and shining effects will create a sense of technology and futurism for the body; in addition, this color can not only highlight the exterior design of the vehicle, but also add a high-end luxury atmosphere to the vehicle. At this stage, some color change inspirations have been derived based on this liquid metal silver, making the body look more three-dimensional and textured, making the entire vehicle exude a metallic luster, adding a sense of luxury to the body; in addition, the cold tones and metallic textures of liquid metal silver can be combined, such as colorful lines or digital textures, to create a futuristic color scheme full of technology, so that the vehicle can be more personalized and unique.

[0003] At present, there are two main technical routes for liquid metal effect color on car bodies: using film technology and using nanocellulose technology. However, the current film technology is costly and time-consuming, and it is difficult to meet the mass production needs of liquid metal effects on car bodies. In addition, the film technology will increase the solid content of the paint. Although the current use of nanocellulose technology can reduce the solid content of the paint to below 5% and promote the thickness of the paint film to reduce to 1μm~2μm, the liquid metal effect of the paint film prepared by nanocellulose technology under existing coating equipment is poor. Summary of the invention

[0004] The present application provides a color paint film with liquid metal effect, a coating structure and a preparation method thereof, in order to solve the following technical problem: how to improve the liquid metal effect of the color paint film.

[0005] In a first aspect, the present application provides a color paint film with a liquid metal effect, wherein the raw materials of the color paint film meet the following requirements in parts by weight: pigment: 0 to 20 parts, aluminum powder: 2 to 7 parts;

[0006] The aluminum powder has a silver dollar shape, the mass ratio of the fine-grained aluminum powder in the aluminum powder to the aluminum powder is ≥0.5; and the particle size of the fine-grained aluminum powder is ≤10 μm.

[0007] Optionally, the composition of the color paint film, in parts by weight, also satisfies: composite resin: 15 parts to 45 parts, functional additive: 1.4 parts to 10.5 parts, organic solvent: 1 part to 5 parts, water: 40 parts to 60 parts.

[0008] Optionally, the composite resin includes at least one of the following:

[0009] Acrylic resins, polyurethane resins, polyester resins and amino resins.

[0010] Optionally, the composite resin includes, by weight: 10 to 20 parts of acrylic resin, 3 to 8 parts of polyurethane resin, 5 to 10 parts of polyester resin, and 1 to 5 parts of amino resin.

[0011] Optionally, the functional additive includes at least one of the following:

[0012] Wetting agents, thickeners, dispersants, defoamers, amines, catalysts and anti-aging agents.

[0013] Optionally, the composition of the functional additives includes, by weight: wetting agent: 0.2 to 2 parts, thickener: 0.5 to 3 parts, dispersant: 0.2 to 2 parts, defoaming agent: 0.2 to 2 parts, amine: 0.1 to 0.5 parts, catalyst: 0.1 to 0.5 parts, anti-aging additive: 0.1 to 0.5 parts.

[0014] In a second aspect, the present application provides a method for preparing the colored paint film according to the first aspect, the method comprising:

[0015] The pigment, aluminum powder, composite resin, functional additive, paint solvent and deionized water are mixed to obtain a color paint slurry;

[0016] Using electrostatic spraying to spray the color paint slurry onto the mid-coat layer, and then leveling and flash-drying the color paint coating on the surface of the mid-coat layer to obtain a first color paint layer;

[0017] Using an electrostatic cup sprayer to spray the color paint slurry onto the first color paint layer, and then leveling and flash-drying the color paint coating on the surface of the first color paint layer to obtain a second color paint coating;

[0018] The first color paint layer and the second color paint layer are pre-baked and then cooled to obtain a color paint film.

[0019] Optionally, the flash drying temperature is 23° C. to 30° C., and the flash drying time is 1.5 min to 2.5 min.

[0020] Optionally, the leveling time is 2.5 min to 3.5 min.

[0021] Optionally, the pre-baking temperature is 60° C. to 80° C., and the pre-baking time is 6 min to 10 min.

[0022] In the third aspect, the present application provides a coating structure with a liquid metal effect, the coating structure comprising: an electrophoretic coating, a water-based intermediate coating, a varnish coating and the color paint film described in the first aspect, the varnish coating being arranged on one side of the color paint film, the water-based intermediate coating being arranged on the side of the color paint film away from the varnish coating, and the electrophoretic coating being arranged on the side of the water-based intermediate coating being away from the color paint film.

[0023] Optionally, the thickness of the electrophoretic coating is 10 μm to 25 μm, the thickness of the water-based intermediate coating is 10 μm to 40 μm, the thickness of the color paint film is 3 μm to 8 μm, and the thickness of the clear varnish coating is 35 μm to 65 μm.

[0024] In a fourth aspect, the present application provides a method for preparing the coating structure according to the third aspect, the method comprising:

[0025] Pre-treating the car body to obtain a car body base layer;

[0026] Performing electrophoretic coating on the vehicle body base layer, and then baking to form an electrophoretic coating on the surface of the vehicle body base layer;

[0027] Allowing the water-based intermediate coating system to cover the surface of the electrophoretic coating to form a water-based intermediate coating on the surface of the electrophoretic coating;

[0028] Forming a color paint film on the surface of the water-based intermediate coating according to the method of the second aspect;

[0029] A varnish coating is used to coat the surface of the color paint film to form a varnish coating on the surface of the color paint film to obtain a coating structure.

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

[0031] The embodiment of the present application provides a color paint film with liquid metal effect. The raw materials of the color paint film meet the following requirements in parts by weight: pigment: 0 to 20 parts, aluminum powder: 2 to 7 parts; wherein the aluminum powder is in the shape of a silver dollar, the mass ratio of fine-particle aluminum powder in the aluminum powder to the aluminum powder is ≥ 0.5; the particle size of the fine-particle aluminum powder is ≤ 10 μm; the weight fraction of the pigment is generally 0 to 20 parts, and the mass fraction of the aluminum powder is generally 2 to 7 parts, which can promote the mixing of the pigment and the aluminum powder. Sufficiently, in order to improve the shade difference of aluminum powder, high shade difference aluminum powder can make the paint film present a better liquid metal effect; in addition, the shape of the aluminum powder can be a silver dollar type, the mass ratio of fine-particle aluminum powder and aluminum powder in the aluminum powder is generally ≥0.5, and the particle size of fine-particle aluminum powder is generally ≤10μm, which can make small particles of aluminum powder arranged evenly. The evenly arranged aluminum powder can improve the sparkle of the paint film on the one hand, and reduce the granularity of the paint film on the other hand, so as to improve the liquid metal effect of the paint film. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0034] Figure 1 A schematic diagram showing a product comparison of a color paint film with a liquid metal effect provided in Example 1 of the present application and Comparative Example 1;

[0035] Figure 2 A schematic flow chart of a method for preparing a colored paint film provided in an embodiment of the present application;

[0036] Figure 3 A schematic flow chart of a method for preparing a coating structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0039] In this document, the terms including "including" and the like mean "including but not limited to". "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; wherein A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, wherein a, b, and c can be single or multiple, respectively. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in this application can be purchased on the market or prepared by existing methods.

[0040] Figure 1 A schematic diagram showing a product comparison of a color paint film with a liquid metal effect provided by Example 1 of the present application and Comparative Example 1 is exemplarily shown;

[0041] like Figure 1 As shown, the embodiment of the present application provides a color paint film with liquid metal effect, and the raw materials of the color paint film meet the following requirements in parts by weight: pigment: 0 to 20 parts, aluminum powder: 2 to 7 parts;

[0042] The aluminum powder has a silver dollar shape, the mass ratio of the fine-grained aluminum powder in the aluminum powder to the aluminum powder is ≥0.5; and the particle size of the fine-grained aluminum powder is ≤10 μm.

[0043] It should be noted that the silver dollar-shaped aluminum powder is an aluminum powder product with a special shape obtained by pressing ordinary granular aluminum powder into flakes.

[0044] It should be noted that the silver dollar-shaped aluminum powder may use Toyo Aluminum 0014 or Toyo Aluminum 0023; in terms of weight parts, the composition of the aluminum powder may include: Toyo Aluminum 0014: 2 to 6 parts, Toyo Aluminum 0023: 0 to 1 part.

[0045] It should be noted that the pigment can be PBk-7 type high-pigment ultra-transparent, PB-15:1 type ultra-transparent blue, or PV-23 type ultra-transparent purple paste; in terms of weight parts, the composition of the pigment can include: PBk-7 type high-pigment ultra-transparent: 0 to 15 parts, PB-15:1 type ultra-transparent blue: 0 to 3 parts and PV-23 type ultra-transparent purple paste: 0 to 1 part.

[0046] In some optional embodiments, the composition of the paint film further satisfies the following by weight: composite resin: 15 to 45 parts, functional additive: 1.4 to 10.5 parts, organic solvent: 1 to 5 parts, water: 40 to 60 parts;

[0047] In these embodiments, the weight portion of the composite resin in the components of the paint film is 15 to 45 parts, which can enable the composite resin to effectively fix aluminum powder and pigment to promote the formation of the paint film, thereby improving the liquid metal effect of the paint film; in addition, the weight portion of the functional additive is 1.4 to 10.5 parts, which can promote the complete formation of the paint film to obtain a paint film with liquid metal effect; in addition, the weight portion of the organic solvent can be 1 to 5 parts, which can improve the dispersibility of aluminum powder in the pigment and the raw material stability of the paint film, thereby improving the liquid metal effect of the paint film; in addition, the weight portion of water can be 40 to 60 parts, which can further improve the dispersibility of aluminum powder in the pigment, thereby improving the liquid metal effect of the paint film.

[0048] The weight proportion of the composite resin is 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or 45 parts.

[0049] The weight proportion of the functional additive is 1.4 parts, 1.5 parts, 2.5 parts, 3.5 parts, 4.5 parts, 5.5 parts, 6.5 parts, 7.5 parts, 8.5 parts, 9.5 parts or 10.5 parts.

[0050] The weight proportion of the organic solvent may be 1 part, 2 parts, 3 parts, 4 parts or 5 parts.

[0051] The weight parts of the water can be 40 parts, 45 parts, 50 parts, 55 parts or 60 parts.

[0052] It should be noted that the organic solvent may be an alcohol solvent or an alcohol ether solvent.

[0053] In some optional embodiments, the composite resin includes at least one of the following:

[0054] Acrylic resins, polyurethane resins, polyester resins and amino resins;

[0055] In these embodiments, the composite resin may include at least one of acrylic resin, polyurethane resin, polyester resin and amino resin, which can promote the pigment and aluminum powder to be effectively fixed in the paint film to promote the complete formation of the paint film, thereby improving the liquid metal effect of the paint film.

[0056] In some optional embodiments, the composite resin includes, by weight: acrylic resin: 10 to 20 parts, polyurethane resin: 3 to 8 parts, polyester resin: 5 to 10 parts, amino resin: 1 to 5 parts;

[0057] In these embodiments, the weight proportion of acrylic resin can be 10 to 20 parts, so that acrylic resin is used as the main film-forming substance. The acrylic resin as the main film-forming substance can provide a directional function for the pigment and aluminum powder of the paint film on the one hand, and on the other hand, can promote the initial forming of the paint film, so as to promote the complete fixation of the pigment and aluminum powder in the paint film, thereby improving the liquid metal effect of the paint film.

[0058] The weight proportion of the polyurethane resin can be 3 to 8 parts, which can enable the polyurethane resin to effectively fix the pigment and aluminum powder to improve the pigment and aluminum powder fixing performance of the paint film; in addition, the polyurethane resin can improve the overall flexibility of the paint film to improve the paint film's resistance to stone or gravel impact.

[0059] The weight proportion of the polyester resin can be 5 to 10 parts, and the polyester resin can effectively improve the film-forming property of the paint film, thereby improving the flexibility and appearance of the paint film.

[0060] The weight proportion of amino resin can be 1 to 5 parts. Amino resin can improve the cross-linking degree of acrylic resin. Acrylic resin with sufficient cross-linking degree can further provide directional function for the pigment and aluminum powder of the paint film on the one hand, and can further promote the initial forming of the paint film on the other hand, thereby improving the liquid metal effect of the paint film.

[0061] The weight parts of the acrylic resin can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts.

[0062] The weight parts of the polyurethane resin can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts.

[0063] The weight parts of the polyester resin can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.

[0064] The weight proportion of the amino resin can be 1 part, 2 parts, 3 parts, 4 parts or 5 parts.

[0065] In some optional embodiments, the functional aid includes at least one of the following:

[0066] Wetting agents, thickeners, dispersants, defoamers, amines, catalysts and anti-aging agents;

[0067] In these embodiments, the functional additives may include at least one of a wetting agent, a thickener, a dispersant, a defoaming agent, an amine, a catalyst and an anti-aging agent, which can improve the dispersibility of aluminum powder in the pigment and the raw material stability of the paint film, thereby improving the liquid metal effect of the paint film.

[0068] In some optional embodiments, the composition of the functional additives includes, by weight: wetting agent: 0.2 to 2 parts, thickener: 0.5 to 3 parts, dispersant: 0.2 to 2 parts, defoamer: 0.2 to 2 parts, amine: 0.1 to 0.5 parts, catalyst: 0.1 to 0.5 parts, anti-aging additive: 0.1 to 0.5 parts;

[0069] In these embodiments, the weight proportion of the wetting agent can be 0.2 to 2 parts. The wetting agent can increase the atomization and wetting properties of the raw materials of the paint film to facilitate the dispersion and molding of the raw materials in the paint film, thereby improving the liquid metal effect of the paint film.

[0070] The weight proportion of the thickener can be 0.5 to 3 parts. The rheological properties of the paint film can be adjusted by the thickening properties of the thickener to improve the viscosity recovery ability of the paint film. In addition, the thickener can also enhance the orientation ability of the aluminum powder in the paint film and the storage stability of the paint film to promote the uniform distribution and complete fixation of the aluminum powder in the paint film, thereby improving the liquid metal effect of the paint film.

[0071] The weight proportion of the dispersant can be 0.2 to 2 parts. The dispersing properties of the dispersant can promote long-term and uniform dispersion of aluminum powder in the paint film. In addition, the dispersant can also increase the dispersibility of other hydrophobic substances such as composite resins, thereby promoting uniform color distribution of the paint film and improving the liquid metal effect of the paint film.

[0072] The weight proportion of the defoaming agent can be 0.2 to 2 parts. The defoaming agent can be used to improve the defoaming performance of the paint film raw material, thereby increasing the film thickness covering the pinhole surface in the paint film to improve the flatness of the paint film, thereby improving the liquid metal effect of the paint film.

[0073] The weight proportion of the amine can be 0.1 to 0.5 parts, and the amine can be used to improve the stability of the raw materials in the paint film, so as to promote the stable and uniform dispersion of the aluminum powder in the paint film, thereby improving the liquid metal effect of the paint film.

[0074] The weight proportion of the catalyst can be 0.1 to 0.5 parts. The catalyst can be used to increase the crosslinking density of the paint film to promote the stable and uniform distribution of the aluminum powder in the paint film, thereby improving the liquid metal effect of the paint film.

[0075] The weight proportion of the anti-aging agent can be 0.1 to 0.5 parts. The anti-aging agent can be used to improve the stability of the pigment and aluminum powder in the paint film, thereby improving the anti-aging property of the paint film and thus improving the liquid metal effect of the paint film.

[0076] The weight portion of the wetting agent can be 0.2 parts, 0.5 parts, 1.0 parts, 1.5 parts or 2.0 parts.

[0077] The weight proportion of the thickener can be 0.5 parts, 1.0 parts, 1.5 parts, 2.0 parts, 2.5 parts or 3.0 parts.

[0078] The weight portion of the dispersant can be 0.2 parts, 0.5 parts, 1.0 parts, 1.5 parts or 2.0 parts.

[0079] The weight proportion of the defoaming agent can be 0.2 parts, 0.5 parts, 1.0 parts, 1.5 parts or 2.0 parts.

[0080] The weight portion of the amine can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part.

[0081] The weight portion of the catalyst can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part.

[0082] The weight proportion of the anti-aging agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part.

[0083] Figure 2 A schematic flow chart of a method for preparing a color paint film provided in an embodiment of the present application is exemplarily shown;

[0084] like Figure 2 As shown, based on a general inventive concept, an embodiment of the present application provides a method for preparing the color paint film, the method comprising:

[0085] S1. Mixing the pigment, aluminum powder, composite resin, functional additives, paint solvent and deionized water to obtain a paint slurry;

[0086] S2. spraying the paint slurry onto the midcoat coating using electrostatic spraying, and then leveling and flashing the paint coating on the surface of the midcoat coating to obtain a first paint coating;

[0087] S3. Spraying the paint slurry onto the first paint layer using an electrostatic cup sprayer, and then leveling and flash-drying the paint coating on the surface of the first paint layer to obtain a second paint coating;

[0088] S4. Pre-baking the first paint layer and the second paint layer, and then cooling to obtain a paint film;

[0089] This method is a method for preparing the above-mentioned colored paint film. The specific composition of the colored paint film can refer to the above-mentioned embodiment. Since this method adopts part or all of the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.

[0090] It should be noted that the method can be carried out with the assistance of a robot. In addition, the electrostatic spraying and air spraying of the paint film can use an electrostatic rotary cup atomizer. The spraying speed of the electrostatic rotary cup atomizer can be ≥50Krpm, and the rotary cup diameter used by the electrostatic rotary cup atomizer is 65mm~80mm.

[0091] It should be noted that the solid content of the paint film can be 10% to 20% so that the silver dollar-shaped aluminum powder can be arranged tightly and evenly in the paint film; in addition, the pigment-to-base ratio of the paint film can be 15PHR to 30PHR to promote a more even arrangement of the aluminum powder under the condition of normal hiding ability of the pigment.

[0092] In some optional embodiments, the flash drying temperature is 23°C to 30°C, and the flash drying time is 1.5min to 2.5min;

[0093] In these embodiments, the flash drying temperature can be 23°C to 30°C, and the flash drying time can be 1.5min to 2.5min, which can promote the paint slurry to be fully dried and formed to obtain the first paint coating and the second paint coating of sufficient thickness.

[0094] The temperature of the flash drying may be 23°C, 24°C, 25°C or 26°C.

[0095] The flash drying time can be 1.5 min, 1.6 min, 1.7 min, 1.8 min, 1.9 min, 2.0 min, 2.1 min, 2.2 min, 2.3 min, 2.4 min or 2.5 min.

[0096] In some optional embodiments, the leveling time is 2.5 min to 3.5 min;

[0097] In these embodiments, the leveling time can be 2.5 minutes to 3.5 minutes, and the paint slurry can be spread on the surface of the mid-coat or the first paint coating by air spraying to promote uniform distribution of the various components of the paint film, thereby obtaining a first paint coating and a second paint coating with uniform thickness.

[0098] The leveling time can be 2.5 min, 2.6 min, 2.7 min, 2.8 min, 2.9 min, 3.0 min, 3.1 min, 3.2 min, 3.3 min, 3.4 min or 3.5 min.

[0099] In some optional embodiments, the pre-baking temperature is 60° C. to 80° C., and the pre-baking time is 6 min to 10 min;

[0100] In these embodiments, the prebaking temperature can be 60°C to 80°C, and the prebaking time can be 6min to 10min. The dehydration rate of the coarse paint film can be ≥85% by prebaking to encourage the coarse paint film layer to form a paint film with a lower moisture content.

[0101] Based on a general inventive concept, an embodiment of the present application provides a coating structure with a liquid metal effect, wherein the coating structure comprises: an electrophoretic coating, a water-based intermediate coating, a varnish coating and the color paint film, wherein the varnish coating is arranged on one side of the color paint film, the water-based intermediate coating is arranged on a side of the color paint film away from the varnish coating, and the electrophoretic coating is arranged on a side of the water-based intermediate coating away from the color paint film.

[0102] The coating structure is realized based on the above-mentioned color paint film. The specific steps of the coating structure can refer to the above-mentioned embodiments. Since the coating structure adopts part or all of the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0103] It should be noted that the appearance of the varnish coating satisfies the following requirements: when the varnish coating has a high-gloss varnish appearance, the distinctness of image (D0I) ≥ 85, the gloss (at an observation angle of 20°) ≥ 85, the long wave (LW H) ≤ 4, and the short wave (LW V) ≤ 10; when the varnish coating has a matte powder varnish appearance, the distinctness of image (D0I) ≥ 85, the gloss (at an observation angle of 20°) is 20 to 60, the long wave (LW H) ≤ 4, and the short wave (LW V) ≤ 10.

[0104] In some optional embodiments, the thickness of the electrophoretic coating is 10 μm to 25 μm, the thickness of the water-based intermediate coating is 10 μm to 40 μm, the thickness of the color paint film is 5 μm to 8 μm, and the thickness of the clear varnish coating is 35 μm to 55 μm;

[0105] In these embodiments, the thickness of the electrophoretic coating can be 10μm to 25μm, the thickness of the water-based mid-coat coating can be 10μm to 40μm, the thickness of the color paint film can be 5μm to 8μm, and the thickness of the varnish coating can be 35μm to 55μm, and a coating structure with a good liquid metal effect can be formed under conditions of lower thickness.

[0106] The thickness of the electrophoretic coating may be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm or 25 μm.

[0107] The thickness of the aqueous mid-coat layer may be 10 μm, 20 μm, 30 μm or 40 μm.

[0108] The thickness of the color paint film can be 5 μm, 6 μm, 7 μm or 8 μm.

[0109] The thickness of the clearcoat layer may be 35 μm, 40 μm, 45 μm, 50 μm or 55 μm.

[0110] It should be noted that the roughness of the electrophoretic coating is Ra≤0.3 μm.

[0111] Figure 3 A schematic flow chart of a method for preparing a coating structure provided in an embodiment of the present application is exemplarily shown;

[0112] Based on a general inventive concept, such as Figure 3 As shown, the embodiment of the present application provides a method for preparing the coating structure, the method comprising:

[0113] S1. Pre-treating the vehicle body to obtain a vehicle body base layer;

[0114] S2. The vehicle body base layer is electrophoretically coated and then baked to form an electrophoretic coating on the surface of the vehicle body base layer;

[0115] S3. The aqueous mid-coat system is covered on the surface of the electrophoretic coating to form an aqueous mid-coat coating on the surface of the electrophoretic coating;

[0116] S4. Forming a paint film on the surface of the water-based intermediate coating according to the method;

[0117] S5. Using a varnish coating to coat the surface of the paint film to form a varnish coating on the surface of the paint film to obtain a coating structure;

[0118] This method is a method for preparing the above-mentioned coating structure. The specific composition of the coating structure can refer to the above-mentioned embodiment. Since this method adopts part or all of the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.

[0119] It should be noted that the pretreatment may be a phosphating treatment, a silanization treatment, or a zirconization treatment.

[0120] It should be noted that after the electrophoretic coating is completed, the base layer of the vehicle body needs to be electrophoretically polished. The electrophoretic polishing process can be performed using 200# to 600# sandpaper to improve the flatness of the base layer of the vehicle body and eliminate burrs on the base layer of the vehicle body, so as to facilitate the subsequent color paint film to fully combine with the base layer of the vehicle body; in addition, polishing can also deal with small electrophoretic defects in the base layer of the vehicle body.

[0121] It should be noted that the water-based mid-coat system can be a water-based 3C2B system, a water-based 3WET 1PH system, or a water-based 3WET system; when the water-based mid-coat system is a water-based 3C2B system, the water-based mid-coat system can be converted into a water-based mid-coat coating with a thickness of 20 μm to 40 μm by baking, and the baking temperature can be 135°C to 145°C, and the baking time can be 27min to 33min; when the water-based mid-coat system is a water-based 3WET 1PH system, the water-based mid-coat system can be converted into a water-based mid-coat coating with a thickness of 10 μm to 25 μm by baking, and the baking temperature can be 78°C to 82°C, and the baking time can be 4min to 6min; when the water-based mid-coat system is a water-based 3WET system, the water-based mid-coat system can be converted into a water-based mid-coat coating with a thickness of 10 μm to 20 μm by leveling, and the leveling time can be 5min to 10min.

[0122] It should be noted that the coating can use 1K varnish or 2K varnish; after the coating, the varnish coating can be converted into a varnish coating with a thickness of 35μm to 65μm by baking; the baking temperature can be 140°C, and the baking time can be 15min to 30min.

[0123] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples that do not specify specific conditions are usually measured according to industry standards; if there are no corresponding industry standards, they are carried out according to common international standards, conventional conditions, or conditions recommended by the manufacturer.

[0124] Example 1

[0125] like Figure 1 As shown, a color paint film with liquid metal effect, in terms of weight parts, the raw materials of the color paint film meet the following requirements: pigment: 15 parts, aluminum powder: 5 parts; composite resin: 30 parts, functional additive: 5.5 parts, organic solvent: 4 parts, water: 41.5 parts;

[0126] The aluminum powder has a silver dollar shape, and the mass ratio of fine-particle aluminum powder to aluminum powder in the aluminum powder is ≥0.5; the particle size of the fine-particle aluminum powder is ≤10 μm.

[0127] In parts by weight, the composition of the aluminum powder may include: Toyo Aluminum 0014: 4.5 parts, Toyo Aluminum 0023: 0.5 parts.

[0128] In parts by weight, the composition of the pigment may include: PBk-7 type high pigment ultra-transparent: 12 parts, PB-15:1 type ultra-transparent blue: 2.5 parts and PV-23 type ultra-transparent purple paste: 0.5 parts.

[0129] Calculated in parts by weight, the composite resin includes: 15 parts of acrylic resin, 5 parts of polyurethane resin, 6 parts of polyester resin, and 4 parts of amino resin.

[0130] The functional additives include, by weight: 1.0 part of wetting agent, 1.5 parts of thickener, 1.0 part of dispersant, 1.0 part of defoaming agent, 0.2 part of amine, 0.3 part of catalyst and 0.5 part of anti-aging agent.

[0131] like Figure 2 As shown, a method for preparing a colored paint film comprises:

[0132] S1. Mixing the pigment, aluminum powder, composite resin, functional additives, paint solvent and deionized water to obtain a paint slurry;

[0133] S2. Using electrostatic spraying, the paint slurry is sprayed onto the midcoat coating, and then the paint coating on the surface of the midcoat coating is leveled and flashed to obtain a first paint coating;

[0134] S3. Spraying the paint slurry onto the surface of the first paint layer using an electrostatic cup sprayer, and then leveling and flashing the paint coating on the surface of the first paint layer to obtain a second paint coating;

[0135] S4. Pre-bake the first color paint layer and the second color paint layer, and then cool them to obtain a color paint film.

[0136] The flash drying temperature was 24°C and the flash drying time was 2.0 min.

[0137] The leveling time is 3.0min.

[0138] The pre-baking temperature is 70°C and the pre-baking time is 8 minutes.

[0139] A coating structure with liquid metal effect, the coating structure comprising: an electrophoretic coating, a water-based intermediate coating, a varnish coating and a color paint film, the varnish coating being arranged on one side of the color paint film, the water-based intermediate coating being arranged on a side of the color paint film away from the varnish coating, and the electrophoretic coating being arranged on a side of the water-based intermediate coating away from the color paint film.

[0140] The thickness of the electrophoretic coating is 10 μm to 25 μm, the thickness of the water-based intermediate coating is 10 μm to 40 μm, the thickness of the color paint film is 5 μm to 8 μm, and the thickness of the varnish coating is 35 μm to 55 μm.

[0141] like Figure 3 As shown, a method for preparing a coating structure, the method comprising:

[0142] S1. Pre-treating the vehicle body to obtain a vehicle body base layer;

[0143] S2. Electrophoretic coating is performed on the base layer of the vehicle body, and then baked to form an electrophoretic coating on the surface of the base layer of the vehicle body;

[0144] S3. The aqueous midcoat system is covered on the surface of the electrophoretic coating to form an aqueous midcoat coating on the surface of the electrophoretic coating;

[0145] S4. Forming a paint film on the surface of the water-based intermediate coating according to the method;

[0146] S5. Use a varnish coating to paint the surface of the color paint film to form a varnish coating on the surface of the color paint film to obtain a coating structure.

[0147] The pretreatment may be a phosphating treatment, a silanization treatment, or a zirconization treatment.

[0148] The water-based mid-coat system is a water-based 3C2B system; the mid-coat film thickness is 20 μm to 40 μm, the baking temperature is 140° C., and the baking time is 30 minutes.

[0149] The varnish coating used in the painting is 2K varnish; after the painting, the varnish coating can be converted into a varnish coating with a thickness of 35μm to 65μm by baking; the baking temperature is 140°C and the baking time is 20min.

[0150] Example 2

[0151] Based on the contents disclosed in Example 1, the following modifications are further made:

[0152] A color paint film with liquid metal effect, the raw materials of the color paint film meet the following requirements in parts by weight: pigment: 5 parts, aluminum powder: 2 parts; composite resin: 19 parts, functional additive: 1.4 parts, organic solvent: 1 part, water: 51.6 parts;

[0153] The aluminum powder has a silver dollar shape, and the mass ratio of fine-particle aluminum powder to aluminum powder in the aluminum powder is ≥0.5; the particle size of the fine-particle aluminum powder is ≤10 μm.

[0154] In parts by weight, the composition of the aluminum powder may include: Toyo Aluminum 0014: 2 parts.

[0155] In parts by weight, the composition of the pigment may include: PBk-7 type high pigment ultra-transparent: 2 parts, PB-15:1 type ultra-transparent blue: 3 parts and PV-23 type ultra-transparent purple paste: 0 parts.

[0156] Calculated in parts by weight, the composite resin includes: 10 parts of acrylic resin, 3 parts of polyurethane resin, 5 parts of polyester resin and 1 part of amino resin.

[0157] The functional additives include, by weight: 0.2 parts of wetting agent, 0.5 parts of thickener, 0.2 parts of dispersant, 0.2 parts of defoaming agent, 0.1 parts of amine, 0.1 parts of catalyst and 0.1 parts of anti-aging agent.

[0158] Example 3

[0159] Based on the contents disclosed in Example 1, the following modifications are further made:

[0160] A color paint film with liquid metal effect, wherein the raw materials of the color paint film meet the following requirements in parts by weight: pigment: 19 parts, aluminum powder: 7 parts; composite resin: 43 parts, functional additive: 10.5 parts, organic solvent: 1.5 parts, water: 40 parts;

[0161] The aluminum powder has a silver dollar shape, and the mass ratio of fine-particle aluminum powder to aluminum powder in the aluminum powder is ≥0.5; the particle size of the fine-particle aluminum powder is ≤10 μm.

[0162] In parts by weight, the composition of the aluminum powder may include: 6 parts of Toyo Aluminum 0014 and 1 part of Toyo Aluminum 0023.

[0163] In parts by weight, the composition of the pigment may include: PBk-7 type high pigment ultra-transparent: 15 parts, PB-15:1 type ultra-transparent blue: 3 parts and PV-23 type ultra-transparent purple paste: 1 part.

[0164] Calculated by weight, the composite resin includes: 20 parts of acrylic resin, 8 parts of polyurethane resin, 10 parts of polyester resin and 5 parts of amino resin.

[0165] Calculated by weight, the functional additives include: wetting agent: 2 parts, thickener: 3 parts, dispersant: 2 parts, defoamer: 2 parts, amine: 0.5 parts, catalyst: 0.5 parts, anti-aging additive: 0.5 parts.

[0166] Example 4

[0167] Based on the contents disclosed in Example 1, the following modifications are further made:

[0168] The flash drying temperature is 30°C and the flash drying time is 1.5 min.

[0169] The leveling time is 2.5 minutes.

[0170] The pre-baking temperature is 60°C and the pre-baking time is 10 minutes.

[0171] Example 5

[0172] Based on the contents disclosed in Example 1, the following modifications are further made:

[0173] The flash drying temperature was 26°C and the flash drying time was 2.5 min.

[0174] The leveling time is 3.5 minutes.

[0175] The pre-baking temperature is 80°C and the pre-baking time is 10 minutes.

[0176] Comparative Example 1

[0177] Based on the contents disclosed in Example 1, the following modifications are further made:

[0178] Instead of using silver dollar-shaped aluminum powder, use granular aluminum powder directly.

[0179] Comparative Example 2

[0180] Based on the contents disclosed in Example 1, the following modifications are further made:

[0181] Use corn flake aluminum powder instead of silver dollar aluminum powder.

[0182] Comparative Example 3

[0183] Based on the contents disclosed in Example 1, the following modifications are further made:

[0184] The weight portion of aluminum powder is 10 parts.

[0185] Comparative Example 4

[0186] Based on the contents disclosed in Example 1, the following modifications are further made:

[0187] The mass ratio of fine-particle aluminum powder to aluminum powder in the aluminum powder is 0.2; the particle size of the fine-particle aluminum powder is ≤10μm.

[0188] Related experiments and effect data:

[0189] The metallic paint effects of the paint film products obtained in each embodiment and comparative example were statistically analyzed. In addition, the solid content, pigment-to-base ratio and other parameters of each paint film were statistically analyzed. The average value of three measurements was taken. The results are shown in Table 1.

[0190] Table 1 Metallic paint effect, solid content and pigment-to-base ratio parameters of each color paint film

[0191]

[0192]

[0193] As can be seen from Table 1, the embodiment of the present application provides a paint film with liquid metal effect, and the weight fraction of the pigment is generally controlled to be 0 to 20 parts, and the mass fraction of the aluminum powder is generally 2 to 7 parts, which can promote sufficient mixing between the pigment and the aluminum powder, so that the paint film presents a better liquid metal effect; in addition, the shape of the aluminum powder can be a silver dollar type, and the mass ratio of fine-particle aluminum powder to aluminum powder in the aluminum powder is generally ≥0.5, and the particle size of the fine-particle aluminum powder is generally ≤10μm, which can promote the uniform arrangement of small particles of aluminum powder to increase the sparkle of the paint film while reducing the granularity of the paint film, thereby improving the liquid metal effect of the paint film, and further promoting the paint film to have the characteristics of "high brightness when viewed from the front and low brightness when viewed from the side".

[0194] In addition, the coating structure with liquid metal effect provided in the embodiment of the present application, based on the good liquid metal effect of the color paint film, can not only effectively meet the performance requirements and construction requirements of the automobile coating, but also reduce the thickness of the traditional color paint film to reduce the overall preparation cost of the car body.

[0195] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features applied for by the present application.

Claims

1. A color paint film with liquid metal effect, characterized in that: In parts by weight, the raw materials of the color paint film meet the following requirements: pigment: 0 to 20 parts, aluminum powder: 2 to 7 parts; The aluminum powder has a silver dollar shape, the mass ratio of the fine-grained aluminum powder in the aluminum powder to the aluminum powder is ≥0.5; and the particle size of the fine-grained aluminum powder is ≤10 μm.

2. The colored paint film according to claim 1, characterized in that: The composition of the color paint film also satisfies the following in parts by weight: composite resin: 15 to 45 parts, functional additive: 1.4 to 10.5 parts, organic solvent: 1 to 5 parts, water: 40 to 60 parts.

3. The colored paint film according to claim 2, characterized in that: The composite resin comprises at least one of the following: Acrylic resins, polyurethane resins, polyester resins and amino resins.

4. The colored paint film according to claim 3, characterized in that: In parts by weight, the composite resin comprises: 10 to 20 parts of acrylic resin, 3 to 8 parts of polyurethane resin, 5 to 10 parts of polyester resin, and 1 to 5 parts of amino resin.

5. The colored paint film according to claim 2, characterized in that: The functional additive comprises at least one of the following: Wetting agents, thickeners, dispersants, defoamers, amines, catalysts and anti-aging agents.

6. The colored paint film according to claim 5, characterized in that: In parts by weight, the functional additive comprises: wetting agent: 0.2 to 2 parts, thickener: 0.5 to 3 parts, dispersant: 0.2 to 2 parts, defoamer: 0.2 to 2 parts, amine: 0.1 to 0.5 parts, catalyst: 0.1 to 0.5 parts, anti-aging additive: 0.1 to 0.5 parts.

7. A method for preparing a colored paint film as claimed in any one of claims 1 to 6, characterized in that: The method comprises: The pigment, aluminum powder, composite resin, functional additive, paint solvent and deionized water are mixed to obtain a color paint coating; Using an electrostatic cup sprayer to spray the color paint onto the mid-coat layer, and then leveling and flash-drying the color paint on the surface of the mid-coat layer to obtain a first color paint layer; Using an electrostatic cup sprayer to spray the color paint onto the first color paint layer, and then leveling and flash-drying the color paint on the surface of the first color paint layer to obtain a second color paint coating; The first color paint layer and the second color paint coating layer are pre-baked and then cooled to obtain a color paint film.

8. The method according to claim 7, characterized in that The flash drying temperature is 23° C. to 30° C., and the flash drying time is 1.5 min to 2.5 min.

9. The method according to claim 7, characterized in that: The leveling time is 2.5 min to 3.5 min.

10. The method according to claim 7, characterized in that The pre-baking temperature is 60° C. to 80° C., and the pre-baking time is 6 min to 10 min.

11. A coating structure having a liquid metal effect, characterized in that: The coating structure includes: an electrophoretic coating, a water-based intermediate coating, a varnish coating and a color paint film as described in any one of claims 1 to 6, the varnish coating is arranged on one side of the color paint film, the water-based intermediate coating is arranged on the side of the color paint film away from the varnish coating, and the electrophoretic coating is arranged on the side of the water-based intermediate coating away from the color paint film.

12. The coating structure according to claim 11, characterized in that: The thickness of the electrophoretic coating is 10 μm to 25 μm, the thickness of the water-based intermediate coating is 10 μm to 40 μm, the thickness of the color paint film is 3 μm to 8 μm, and the thickness of the clear varnish coating is 35 μm to 65 μm.

13. A method for preparing a coating structure as claimed in claim 11 or 12, characterized in that: The method comprises: Pre-treating the car body to obtain a car body base layer; Performing electrophoretic coating on the vehicle body base layer, and then baking to form an electrophoretic coating on the surface of the vehicle body base layer; Allowing the water-based intermediate coating system to cover the surface of the electrophoretic coating to form a water-based intermediate coating on the surface of the electrophoretic coating; Forming a color paint film on the surface of the water-based mid-coat coating according to the method described in any one of claims 7 to 10; A varnish coating is used to coat the surface of the color paint film to form a varnish coating on the surface of the color paint film to obtain a coating structure.

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