A metal effect paint with bloom prevention and a preparation method and application thereof

Abstract

The present application relates to a kind of anti-metallic effect paint and its preparation method and application, the raw material of the metallic effect paint includes the following mass parts of components: polyester resin 15~30 parts, amino resin 5~15 parts, directional arrangement aid 3~8 parts, cellulose acetate butyrate 15~30 parts, metal pigment 5~10 parts, anti-sedimentation agent 1~3 parts, leveling agent 0.1~1 part, light aging aid 0.2~2 parts and solvent 20~40 parts;The directional arrangement aid uses microgel.Compared with prior art, the present application has excellent storage stability, prevents metal pigment from blooming, and has good paint film brightness and weather resistance.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and relates to an anti-blooming metallic effect paint, its preparation method and application. Background Technology

[0002] In the design process of new energy vehicles, designers need to consider the vehicle's main structure and aerodynamics to improve the aesthetic design of the body. For example, many new energy vehicles do not have a fuel engine, so they do not need an air intake grille. This results in a larger front bumper area, and the rear bumper also becomes larger for the overall coordination and aesthetics of the vehicle. Consequently, the overall painting area of ​​the bumpers of new energy vehicles increases, which also increases the difficulty of painting, such as controlling indicators like color difference, orange peel, runs, and vividness.

[0003] The general process for bumper painting is either three coats and two bakes (3C2B) or three coats and one bake (3C1B). Currently, most factories use the three-coat-one-bake process, which is as follows: pretreatment → moisture drying → flame treatment → primer spraying → flash drying → color paint spraying → flash drying → clear coat spraying → flash drying → baking → polishing. The process is not very complicated, and the paint technology itself is mature. The most difficult part to control is the process control, because the front and rear bumpers have a large area and are closely integrated with the car body, basically on the same plane. Therefore, the requirements for appearance and color difference are very high, and even very slight differences can be detected. Especially for metallic effect paints, the color is not only related to the application viscosity, coating film thickness, and spraying method, but also to the orientation and arrangement of the metallic pigments in the paint film. If the orientation and arrangement of the metallic pigments are not good, not only will the paint film color not match the car body color, but the paint film itself will also be uneven in color, with some areas being too dark or too light, which is commonly referred to as paint film blooming.

[0004] The main technical solutions to the problem of paint blooming include the following: 1. Use thixotropic agents and add polyamide wax or polyethylene wax. These thixotropic agents are effectively activated by solvents to form a strong network structure in the paint system, which helps the directional arrangement of metallic pigments. However, polyamide wax will form azobenzene after exposure to light, which will cause the paint film to yellow and affect the gloss and weather resistance. At the same time, the cost is very high. Polyethylene wax will also affect the gloss, the amount required to add is too large, the thixotropic effect is not ideal, and it cannot be used for topcoat. 2. Sag Control Agent (SCA) is used, which is achieved by modifying resins with polyurea compounds. This type of sag control agent forms a three-dimensional network structure by hydrogen bonds between polyurea crystals. Under slight shear force, the hydrogen bonds break down, the viscosity decreases, and once the shear force disappears, the hydrogen bonds quickly recover, reforming the three-dimensional network structure, thus making it less prone to flow. The main applications of sag control agents include spraying paints on large vertical surfaces or other areas requiring anti-sagging properties. Sag control agents do not affect gloss, can improve interlayer adhesion, react with amino groups in the paint system, and have no negative impact on physical, mechanical, or chemical resistance properties. However, the required effective ingredient is 2-5%, which is a relatively high amount and therefore expensive.

[0005] Patent CN109679412A discloses a bumper paint with a silver powder effect and no shielding effect on automotive radar, as well as its preparation method. It is prepared using the following components and their weight percentages: 18-28 parts wax additives, 6-9 parts acrylic resin, 2-5 parts modified polyester, 5-6 parts amino rheology modifier, 40-45 parts cellulose acetate, 0.2-0.5 parts leveling agent, 8-10 parts solvent, 6-9 parts mica flakes, and 0.2-0.5 parts dispersant. The resins used in this patent are acrylic resin and cellulose acetate, both of which have high molecular weights and constitute a large proportion of the formulation. This patent utilizes the rapid drying of these large-molecule resins to promote the arrangement of the mica flakes that create the silver powder effect. However, the resin dries too quickly, making it unsuitable for large-area spraying on automotive parts such as bumpers. Furthermore, the patent's formulation contains a large amount of wax additives, which have low solid content, reducing the product's application solids and leading to decreased paint coverage.

[0006] Patent CN104403456A discloses a single-component electrostatic spray coating for automotive bumpers and its preparation method. The coating comprises the following components by weight: 20-30 parts of 50% AC-1053 acrylic resin, 10-20 parts of 50% AC-1032 acrylic resin, 10-20 parts of flexible functional resin, 5-10 parts of blocked isocyanate, 5-10 parts of non-aqueous dispersible microgel resin, 5-10 parts of cellulose acetate butyrate solution, 10-20 parts of pigment paste, 2-5 parts of anti-settling agent, 0.1-0.5 parts of leveling agent, 0.5-2 parts of UV absorber, 0-3 parts of resistance adjuster, and 7-20 parts of solvent. However, this patent has a high acrylic resin content and a relatively large molecular weight. Adjusting to the same application viscosity requires a large amount of diluent, which can lead to insufficient hiding power of the paint and a phenomenon similar to blooming.

[0007] Patent CN120590845A discloses a solvent-based coil coating, its preparation method, and its application. By weight, it comprises 30-40 parts saturated polyester resin, 10-20 parts modified polyester resin, 6-10 parts amino resin, 0.2-1.0 parts catalyst, 0.5-1.5 parts light stabilizer, 14-22 parts pigment, 4.8-12 parts additives, and 8-25 parts solvent. However, this patent describes a high-temperature baking coating primarily composed of polyester and amino resins, without adding metal pigment orienting and alignment aids, thus failing to solve the problem of pigment blooming. Summary of the Invention

[0008] The purpose of this invention is to overcome at least one defect of the prior art and provide an anti-blooming metallic effect paint, its preparation method and application. This invention has excellent storage stability, prevents metallic pigments from blooming, and has good paint film clarity and weather resistance.

[0009] The objective of this invention can be achieved through the following technical solutions: One of the technical solutions of the present invention is to provide an anti-blooming metallic effect paint, wherein the raw materials of the metallic effect paint include the following components in parts by weight: 15-30 parts polyester resin, 5-15 parts amino resin, 3-8 parts orientation accelerator, 15-30 parts cellulose acetate butyrate (CAB), 5-10 parts metallic pigment, 1-3 parts anti-settling agent, 0.1-1 part leveling agent, 0.2-2 parts photoaging accelerator, and 20-40 parts solvent; The directional alignment aid is a microgel.

[0010] As a preferred technical solution, the raw materials of the metallic effect paint include the following components in parts by weight: Polyester resin 18-26 parts, amino resin 8-12 parts, orientation accelerator 3-6 parts, cellulose acetate butyrate 18-25 parts, metallic pigment 6-9 parts, anti-settling agent 1.5-2.5 parts, leveling agent 0.2-0.7 parts, photoaging accelerator 0.5-1 part, solvent 27-38 parts.

[0011] Furthermore, the polyester resin is selected from one or more saturated polyester resins such as SETAL 173VS-60 and SETAL 1723 from Zhanxin. These saturated polyester resins have a moderate molecular weight and slightly mix with the primer, so they have good adhesion and fast drying, making them suitable as the main resin for metallic paints. At the same time, they use weather-resistant monomers such as neopentyl glycol (NPG) and isophthalic acid (IPA), so they have excellent weather resistance. The amino resin is selected from one or more n-butyl etherified high-imino melamines from Changchun Chemical BR167, Zhanxin SETAMINE US-138, and Shanghai Yuanbang YP5132. These n-butyl etherified high-imino melamines are rich in highly active imino (-NH-) and n-butoxy (-OC4H9) in their molecular structure, and can achieve rapid curing without the addition of an external acid catalyst. Therefore, the crosslinking temperature is low, which meets the low-temperature baking requirements of plastic parts such as automotive bumpers.

[0012] Furthermore, the orientation and alignment aid is selected from one or more anionic acrylic microgels such as MEGO Microspheres MS-855-30 and PZS-4349. These anionic acrylic microgels are highly cross-linked internally, and the molecular chains are "locked" inside the particles, unable to extend or entangle with each other. This results in good compatibility with saturated polyester resin systems. At the same time, as a dispersion of internally bridging particles with very small particle sizes (30~500 nm), it provides thixotropic flow through the flocculation effect of the swollen gel particles, thereby imparting thixotropy to the paint. That is, when the paint passes through the spray gun, the viscosity decreases at high shear rates and can maintain leveling for a sufficient time at low shear rates, followed by an increase in viscosity, thereby achieving the orientation and alignment of metallic pigments.

[0013] Furthermore, the cellulose acetate butyrate is selected from one or more of Eastman CAB-381-0.5, CAB-381-2, and CAB-551-0.2. These types of cellulose acetate butyrate have small molecular weights and short molecular chains, and the entanglement effect is greatly reduced or even eliminated, resulting in low viscosity, wide compatibility, and good storage stability of the corresponding resin system.

[0014] Furthermore, the metallic pigment is selected from one or more coated aluminum silver pastes selected from STAPA HCP 6345, STAPA HCP 6105, Asahi Kasei HR-50A, and Asahi Kasei HR-120. These coated aluminum silver pastes have a coated surface and good wettability with the resin system, which helps in their orientation and arrangement in the resin system.

[0015] Furthermore, the anti-settling agent used is Desparon 6900-20X, which mainly prevents metallic pigments from settling in the paint, rather than from directional alignment after application. The leveling agent is selected from one or more silicone leveling agents such as BYK306 and Evonik TEGO GLIDE 100. These silicone leveling agents are beneficial for the dispersion of metallic pigments and the wetting of primers. The photoaging additives are selected from one or more of BASF TINUVIN 400 and Yongguang Chemical EV40S. These additives have the function of absorbing and capturing free radicals, which can improve the weather resistance of paint and meet the high standards of automobiles.

[0016] Furthermore, the solvent is a mixture of butyl acetate and propylene glycol methyl ether acetate (PMA). Of the 20-40 parts of the solvent, 10-20 parts are butyl acetate and 10-20 parts are propylene glycol methyl ether acetate. These two solvents are different types. Butyl acetate has strong solubility and fast evaporation rate, while propylene glycol methyl ether acetate has weak solubility and slow evaporation rate. Using them together makes it easy to adjust the solubility and evaporation rate.

[0017] As a preferred technical solution, the solvent comprises 15-20 parts of butyl acetate and 12-18 parts of propylene glycol methyl ether acetate in 27-38 parts.

[0018] One of the technical solutions of the present invention is to provide a method for preparing the aforementioned anti-blooming metallic effect paint, the method comprising the following steps: S1. Add some solvent to the orientation aligning agent. Because the viscosity of the orientation aligning agent is higher than that of the solvent, the shear force is greater when stirring. Adding a solvent with lower viscosity makes it easier to stir evenly. Therefore, the order cannot be reversed. Stir at medium speed, add some polyester resin, and stir at medium speed to obtain the orientation aligning agent intermediate. S2. Stir the metallic pigment and the remaining solvent at medium speed to form a paste, then soak to obtain the metallic pigment intermediate. S3. Add the anti-settling agent to the remaining polyester resin while stirring at low speed. After adding the agent, stir at high speed. Then add cellulose acetate butyrate, amino resin, leveling agent, and photoaging agent in sequence while stirring at low speed. Add the directional alignment agent intermediate while stirring at medium speed. Add the metallic pigment intermediate while stirring at medium speed to obtain the anti-blooming metallic effect paint.

[0019] Further, in step S1, 6-9 wt% solvent is added to the orientation auxiliaries, and 5-7 wt% polyester resin is added under medium-speed stirring; In steps S1 to S3, the stirring speed is 400-600 rpm, and the time is 10-20 minutes. In step S3, the low-speed stirring speed is 300-500 rpm, and the time is 20-30 minutes. In step S3, the high-speed stirring speed is 1000~1500 rpm, and the time is 30~45 min; The soaking time in step S2 is 4-6 hours.

[0020] One of the technical solutions of the present invention is to provide an application of the aforementioned anti-flowering metallic effect paint in automobile bumpers.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The metallic pigments of the present invention are uniformly oriented and arranged, and the acrylic microgel has excellent thixotropic properties, so that the metallic pigments are neatly arranged in the wet film state, and the surface is uniform after flash drying and drying, and there will be no uneven distribution and irregular arrangement of metallic pigments. (2) The paint film of the present invention has good reflectivity. The refractive index of the acrylic microgel is almost the same as that of the cross-linked paint film main resin polymer, so it will not cause the paint film to lose gloss or produce haze after use. (3) The present invention has good weather resistance. The microgel is mainly composed of acrylic acid, which has excellent weather resistance. At the same time, the main polyester resin also has excellent weather resistance, which meets the overall high weather resistance requirements of automotive parts. (4) The present invention has excellent storage stability. Existing wax thixotropic agents belong to the "fibrous crystal network" type, and their thixotropy depends on the hydrogen bond network of anisotropic fibers. Microgels belong to the "particle physical cross-linking" type, and their thixotropy depends on the reversible stacking and deformation of soft particles. They do not generate interaction forces with other molecules. Therefore, paints with added microgels will not produce particle precipitation or gloss reduction even after long-term storage, and have good stability. (5) The present invention has a high cost performance. Compared with thixotropic agents, the directional alignment additive has better directional alignment of metallic pigments, better paint film brightness and weather resistance. Compared with sagging control agents, it has better stability and is more cost-effective. Therefore, the directional alignment additive has the highest cost performance in a comprehensive comparison. (6) This invention uses a combination of polyester resin and amino resin to crosslink and form a film. Because this resin system has low viscosity and high solid content during construction, the paint has high hiding power and filling capacity. The paint also has good atomization during spraying. It is suitable for spraying large-area parts such as car bumpers and spoilers. It can also be applied to large-area spraying in other fields and has a broad market. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0023] Unless otherwise specified, the equipment used in the following embodiments is conventional equipment in the art; unless otherwise specified, the reagents used are commercially available products or prepared by conventional methods in the art. In the following embodiments, unless otherwise described in detail, conventional experimental methods in the art can be used.

[0024] Unless otherwise specified, the following procedures are generally performed at room temperature and atmospheric pressure.

[0025] Example 1: A metallic effect paint with anti-blooming properties, comprising the following components in specific weight parts: The following ingredients were used: 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 4 parts of MEGO microsphere MS-855-30 orientation aligner, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate (CAB), 7 parts of Aika STAPA HCP6105 metallic pigment, 2 parts of DISPARON 6900-20X anti-settling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN400 photoaging agent, 15.5 parts of butyl acetate solvent, and 14.5 parts of propylene glycol methyl ether acetate (PMA) solvent. The proportions are shown in Table 1.

[0026] The specific steps for preparing the above-mentioned anti-blooming metallic effect paint are as follows: S1. Pour the orientation aligning agent into a container, slowly add 8 wt% mixed solvent, stir at medium speed of 500 rpm for 15 min, add 6 wt% polyester resin, stir at medium speed of 500 rpm for 15 min, and obtain the orientation aligning agent intermediate. S2. Stir the metallic pigment and the remaining mixed solvent at a medium speed of 500 rpm for 15 min to form a paste, and soak for 5 h to obtain the metallic pigment intermediate. S3. Pour the remaining polyester resin into the tank, add the anti-settling agent while stirring at a low speed of 400 rpm, and then stir at a high speed of 1250 rpm for 40 min. Add cellulose acetate butyrate, amino resin, leveling agent, and photoaging agent in sequence, and stir at a low speed of 400 rpm for 25 min. Add the directional alignment agent intermediate, and stir at a medium speed of 500 rpm for 15 min. Add the metallic pigment intermediate, and stir at a medium speed of 500 rpm for 15 min to obtain the anti-blooming metallic effect paint.

[0027] Example 2: A metallic effect paint to prevent blooming is basically the same as in Example 1, except that the types of components are different. The amount of polyester resin added is increased from 23 parts to 24 parts, and the amount of amino resin added is decreased from 11 parts to 10 parts. The specific components by weight are as follows: The following ingredients were used: 24 parts of Zhanxin SETAL 1723 polyester resin, 10 parts of Changchun Chemical BR167 amino resin, 4 parts of Meigao Microsphere PZS-4349 orientation aligner, 22 parts of Eastman CAB-551-0.2 cellulose acetate butyrate, 7 parts of Asahi Kasei HR-50A metallic pigment, 2 parts of Desparon 6900-20X anti-settling agent, 0.2 parts of Evonik TEGO GLIDE 100 leveling agent, 0.8 parts of Yongguang Chemical EV40S photoaging aid, 15.5 parts of butyl acetate solvent, and 14.5 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0028] The preparation method of the above-mentioned anti-blooming metallic effect paint is the same as that in Example 1.

[0029] Example 3: A metallic effect paint for preventing blooming is basically the same as in Example 1, except that the amount of the directional alignment additive is increased from 4 parts to 5 parts, and a mixed solvent is used to make up the total of 100 parts. The specific components by weight are as follows: The following ingredients were used: 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 5 parts of MEGO microsphere MS-855-30 orientation aligner, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate, 7 parts of Aika STAPA HCP 6105 metallic pigment, 2 parts of DISPARON 6900-20X antisettling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN 400 photoaging agent, 15 parts of butyl acetate solvent, and 14 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0030] The preparation method of the above-mentioned anti-blooming metallic effect paint is the same as that in Example 1.

[0031] Example 4: A metallic effect paint for preventing blooming is basically the same as in Example 1, except that the amount of the directional alignment additive is reduced from 4 parts to 3 parts, and a mixed solvent is used to make up the total of 100 parts. The specific components by weight are as follows: The following ingredients were used: 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 3 parts of MEGO microsphere MS-855-30 orientation aligner, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate, 7 parts of Aika STAPA HCP 6105 metallic pigment, 2 parts of DISPARON 6900-20X antisettling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN 400 photoaging agent, 16 parts of butyl acetate solvent, and 15 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0032] The preparation method of the above-mentioned anti-blooming metallic effect paint is the same as that in Example 1.

[0033] Comparative Example 1: A metallic paint, essentially the same as in Example 1, except that no directional alignment aid is added, and a mixed solvent is used to bring the total to 100 parts. The specific components by weight are as follows: The mixture consists of 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate, 7 parts of Aika STAPA HCP 6105 metallic pigment, 2 parts of Desparon 6900-20X anti-settling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN 400 photoaging aid, 17.5 parts of butyl acetate solvent, and 16.5 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0034] The preparation method of the above metallic paint is the same as that in Example 1.

[0035] Comparative Example 2: A metallic paint, essentially the same as in Example 1, except that a thixotropic agent is used to replace the directional alignment aid, and a mixed solvent is used to bring the total to 100 parts. The specific components by weight are as follows: The following components were used: 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 18 parts of Hemings DeuRheo 556S thixotropic agent, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate, 7 parts of Aika STAPA HCP 6105 metallic pigment, 2 parts of Disparon 6900-20X anti-settling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN 400 photoaging aid, 8.5 parts of butyl acetate solvent, and 7.5 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0036] The preparation method of the above metallic paint is the same as that in Example 1.

[0037] Comparative Example 3: A metallic paint, essentially the same as in Example 1, except that a sagging control agent is used instead of the directional alignment aid, and a mixed solvent is used to bring the total to 100 parts. The specific components by weight are as follows: The following ingredients were used: 23 parts of Zhanxin SETAL 173VS-60 polyester resin, 11 parts of Shanghai Yuanbang YP5132 amino resin, 8 parts of Zhanxin SETALUX91795 VX-60 YB sagging control agent, 22 parts of Eastman CAB-381-0.5 cellulose acetate butyrate, 7 parts of Aika STAPA HCP6105 metallic pigment, 2 parts of Disparon 6900-20X anti-settling agent, 0.2 parts of BYK 306 leveling agent, 0.8 parts of BASF TINUVIN400 photoaging aid, 13.5 parts of butyl acetate solvent, and 12.5 parts of propylene glycol methyl ether acetate solvent. The proportions are shown in Table 1.

[0038] The preparation method of the above metallic paint is the same as that in Example 1.

[0039] Table 1. Paint proportions in the examples and comparative examples. The above-mentioned paint was subjected to the following tests or experiments, and the test or experiment results were then analyzed.

[0040] Experimental example: The above-mentioned paint and the dry film coating obtained by spraying it on polypropylene (PP) car bumper substrate were tested for storage stability, color difference, appearance (blooming), DOI, adhesion, water resistance and weather resistance. The test results are shown in Table 2.

[0041] Table 2 Test results of paint and dry film coatings in the examples and comparative examples. As shown in Table 2, the paint in Example 1 has better reflectivity than that in Example 2, but its weather resistance is worse. This indicates that the two microgels in the examples have different effects and can be selected according to actual needs. The paint in Example 3 showed significantly better reflectivity and weather resistance than that in Examples 1 and 4, indicating that appropriately increasing the amount of microgel in the examples can improve the overall performance of the paint film. Compared to the paint in Example 1, the metallic pigments in Comparative Example 1 were poorly arranged, exhibited severe blooming, and had reduced adhesion, demonstrating the important directional arrangement role of the microgels in the formulation in the examples. The thixotropic agent in Comparative Example 2 also has some aligning effect on metallic pigments, but its mechanism of action as a wax is different from that of microgels. Its directional alignment effect, as well as its related vividness and weather resistance, are not as good as those of microgels. The sagging control agent in Comparative Example 3 did not have an anti-settling function. After the paint was diluted, it settled severely, which led to color difference before and after spraying and poor storage stability. Based on the above comparative test results, it can be seen that the anti-blooming metallic effect paint with added microgel directional alignment additive in the examples has significantly better overall performance in terms of storage stability, color difference, appearance, vividness, adhesion, water resistance and weather resistance than the paint with added thixotropic agent or sagging control agent in the control proportion.

[0042] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A metallic effect paint with anti-blooming properties, characterized in that, The raw materials for this metallic effect paint include the following components in parts by weight: The composition includes 15-30 parts polyester resin, 5-15 parts amino resin, 3-8 parts orientation accelerator, 15-30 parts cellulose acetate butyrate, 5-10 parts metallic pigment, 1-3 parts anti-settling agent, 0.1-1 part leveling agent, 0.2-2 parts photoaging accelerator, and 20-40 parts solvent. The directional alignment aid is a microgel.

2. The anti-blooming metallic effect paint according to claim 1, characterized in that, The polyester resin is selected from one or more saturated polyester resins selected from Zhanxin SETAL 173VS-60 and SETAL 1723; The amino resin is selected from one or more n-butyl etherified high-imino melamines from Changchun Chemical BR167, Zhanxin SETAMINE US-138, and Shanghai Yuanbang YP5132.

3. The anti-blooming metallic effect paint according to claim 1, characterized in that, The orientation aligning agent is selected from one or more anionic acrylic microgels, such as MEGO microspheres MS-855-30 and PZS-4349.

4. The anti-blooming metallic effect paint according to claim 1, characterized in that, The cellulose acetate butyrate is selected from one or more of Eastman CAB-381-0.5, CAB-381-2, and CAB-551-0.

2.

5. The anti-blooming metallic effect paint according to claim 1, characterized in that, The metallic pigment is selected from one or more coated aluminum silver pastes selected from STAPA HCP 6345, STAPA HCP 6105, Asahi Kasei HR-50A, and Asahi Kasei HR-120.

6. The anti-blooming metallic effect paint according to claim 1, characterized in that, The anti-settling agent used is DISPARON 6900-20X; The leveling agent is selected from one or more silicone leveling agents, such as BYK306 and Evonik TEGO GLIDE 100. The photoaging aid is selected from one or more of BASF TINUVIN 400 and Yongguang Chemical EV40S.

7. The anti-blooming metallic effect paint according to claim 1, characterized in that, The solvent is a mixture of butyl acetate and propylene glycol methyl ether acetate, wherein 10-20 parts of butyl acetate and 10-20 parts of propylene glycol methyl ether acetate are present in 20-40 parts of the solvent.

8. A method for preparing an anti-blooming metallic effect paint as described in any one of claims 1 to 7, characterized in that, The method includes the following steps: S1. Add some solvent to the orientation accelerator, stir at medium speed, add some polyester resin, stir at medium speed, and obtain the orientation accelerator intermediate; S2. Stir the metallic pigment and the remaining solvent at medium speed to form a paste, then soak to obtain the metallic pigment intermediate. S3. Add the anti-settling agent to the remaining polyester resin while stirring at low speed. After adding the agent, stir at high speed. Then add cellulose acetate butyrate, amino resin, leveling agent, and photoaging agent in sequence while stirring at low speed. Add the directional alignment agent intermediate while stirring at medium speed. Add the metallic pigment intermediate while stirring at medium speed to obtain the anti-blooming metallic effect paint.

9. The method for preparing an anti-blooming metallic effect paint according to claim 8, characterized in that, In step S1, 6-9 wt% solvent is added to the orientation auxiliaries, and 5-7 wt% polyester resin is added under medium-speed stirring; In steps S1 to S3, the stirring speed is 400-600 rpm, and the time is 10-20 minutes. In step S3, the low-speed stirring speed is 300-500 rpm, and the time is 20-30 minutes. In step S3, the high-speed stirring speed is 1000~1500 rpm, and the time is 30~45 min; The soaking time in step S2 is 4-6 hours.

10. The application of an anti-blooming metallic effect paint as described in any one of claims 1 to 7 in an automobile bumper.

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