Coating weathering verification method, coating system and automotive body part

Abstract

The application provides a coating weather resistance verification method, a coating system and an automobile body part, and the method comprises the following steps: determining a corresponding coating system according to a selected coated substrate; using the coating system to adjust target automobile body colors according to the weather resistance requirements of different parts, and forming differentiated coating formulas; performing comprehensive performance tests on at least one target automobile body color, and obtaining the target color paste type used by the target automobile body color when the test is passed; obtaining the ratio of pigments to binders of the color paint layer in the test passed coating formula, and taking the maximum value in the ratio as the limit color base ratio; combining the coating of the coating system with the target color paste type, and adjusting according to the limit color base ratio, and performing weather resistance verification on the adjusted test coating. In this way, the weather resistance of the coating can be tested while ensuring that the stone impact resistance, scratch resistance, chemical resistance and other performances of the coating are not affected, the development cycle of the coating is greatly shortened, and the development efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and in particular to a method for verifying the weather resistance of a coating, a coating system, and automotive body parts. Background Technology

[0002] Automotive coatings have irreplaceable advantages in improving product aesthetics, corrosion resistance, and scratch resistance. However, they are prone to discoloration and cracking after aging, which affects the performance of automobiles. Therefore, coating weather resistance testing has become an indispensable part of its development process.

[0003] Existing coating weather resistance tests are mainly divided into two types: outdoor natural exposure test and artificial accelerated aging test. The natural exposure test has a cycle of 2 years, while the artificial accelerated aging test has a cycle of 3-5 months. Both require a long time period, which seriously affects the project development schedule.

[0004] Therefore, there is an urgent need for a method for verifying the weather resistance of coatings, a coating system, and automotive body components to solve the above problems. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a coating weather resistance verification method, coating system and automotive body parts, which can ensure that the coating’s resistance to stone impact, scratches and chemicals is not affected while performing lean coating weather resistance testing, thus significantly shortening the coating development cycle and improving development efficiency.

[0006] The technical problem solved by this invention is achieved by the following technical solution: A method for verifying the weather resistance of a coating includes: determining a corresponding coating system based on a selected substrate; formulating a target body color using the coating system according to the weather resistance requirements of different parts to form a differentiated coating formulation; conducting a comprehensive performance test on at least one of the target body colors, and obtaining the type of target pigment used in the target body color when the test is passed; obtaining the ratio of pigment to binder in the paint layer of the coating formulation that has passed the test, and taking the maximum value of the ratio as the limiting pigment-to-binder ratio; combining the coating of the coating system with the type of target pigment, and formulating according to the limiting pigment-to-binder ratio, and verifying the weather resistance of the formulated test coating.

[0007] In a preferred embodiment of the present invention, the types of substrates to be coated include: plastic substrates and metal substrates.

[0008] In a preferred embodiment of the present invention, the coating system includes: a first interior coating, a second interior coating, a third interior coating, and a first exterior coating; the first exterior coating includes a three-layer structure coating and a plastic substrate; the first interior coating includes a two-layer coating structure and a plastic substrate; the second interior coating includes a two-layer coating structure and a metal substrate; and the third interior coating is a single-layer coating structure and a plastic substrate.

[0009] In a preferred embodiment of the present invention, the above-mentioned comprehensive performance test includes at least one of the following: light aging resistance test, heat aging resistance test, chemical resistance test, water resistance test, and stone impact resistance test.

[0010] In a preferred embodiment of the present invention, the above-mentioned base material content is the sum of the solid content of the main resin of the paint layer and the solid content of the curing agent; the pigment content is the total amount of pigment paste, filler, metallic pigment and pearlescent pigment added to the paint layer.

[0011] In a preferred embodiment of the present invention, the limiting pigment-to-binder ratio determined for the exterior coating is 1, and the limiting pigment-to-binder ratio determined for the interior coating is 0.85.

[0012] In a preferred embodiment of the present invention, the combination of the coating system and the target colorant type, and the formulation according to the limiting pigment-to-binder ratio, includes: for a three-layer coating, using a primer and clear coat that have passed the comprehensive performance test as a fixed top and bottom layer, and formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio; for a two-layer coating, using a clear coat that has passed the comprehensive performance test as a fixed top layer, and formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio; for a single-layer coating, formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio.

[0013] In a preferred embodiment of the present invention, the above-mentioned combination of the coating system with the target color paste type and the formulation according to the limiting pigment-to-binder ratio, and the weather resistance verification of the formulated test coating, includes: using the color paste that passes the weather resistance verification as a high-performance color paste; arbitrarily combining the coating system with the high-performance color paste to obtain a target formulated color coating; and confirming that the target formulated color coating meets the preset weather resistance requirements when the ratio of pigment to binder in the target formulated color coating does not exceed the limiting pigment-to-binder ratio.

[0014] A coating system is prepared by combining a coating system selected by the coating weather resistance verification method described in any one of the above-mentioned methods with a color paste.

[0015] A car body component, the surface of which is coated with the above-mentioned coating system.

[0016] The coating weather resistance verification method, coating system, and automotive body parts provided in this application include: determining a corresponding coating system based on a selected substrate; formulating a target body color using the coating system according to the weather resistance requirements of different parts, forming a differentiated coating formulation; conducting a comprehensive performance test on at least one of the target body colors, and obtaining the target pigment type used in the target body color when the test is passed; obtaining the pigment-to-base ratio of the paint layer in the tested coating formulation, and taking the maximum value of the ratio as the limiting pigment-to-base ratio; combining the coating of the coating system with the target pigment type, and formulating according to the limiting pigment-to-base ratio, and performing weather resistance verification on the formulated test coating. This allows for lean coating weather resistance testing while ensuring that the coating's resistance to stone chips, scratches, and chemicals remains unaffected, significantly shortening the coating development cycle and improving development efficiency.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic flowchart illustrating a method for verifying the weather resistance of a coating, as shown in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a coating system shown in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of a test result shown in an embodiment of the present invention. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the embodiments of the present invention. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve its intended purpose can be obtained. Moreover, the accompanying drawings are only provided for reference and illustration and are not intended to limit the present invention.

[0022] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating a method for verifying the weather resistance of a coating, as shown in an embodiment of the present invention.

[0023] like Figure 1 As shown, a coating weather resistance verification method according to an embodiment of the present invention includes the following steps: Step S11: Determine the corresponding coating system based on the selected substrate.

[0024] The substrate to be coated refers to the original material carrier on the surface before the coating is applied, and its function is to provide physical support and bonding interface for functional or decorative coatings.

[0025] Specifically, the substrate must be pretreated before coating (e.g., cleaning, degreasing, sanding, sandblasting, chemical conversion) to improve coating adhesion.

[0026] A coating system refers to a multi-layer structure composed of one, two, or more different functional coatings combined in a specific order to achieve specific protective, decorative, or functional objectives.

[0027] In one embodiment, the types of substrates to be coated include: plastic substrates and metal substrates.

[0028] Optionally, to ensure the adequacy of the verification, six different coated substrates were selected for verification, and the coating system corresponding to each coated substrate was determined based on the different coated substrates.

[0029] For example, six materials were selected as the substrates to be coated: polypropylene (PP), acrylonitrile-butadiene-styrene copolymer (ABS), PP+ABS composite material, PC (polyurethane)+ABS composite material, stainless steel grade SUS304, and magnesium-aluminum alloy grade AZ91D.

[0030] In one embodiment, the coating system includes: a first interior coating, a second interior coating, a third interior coating, and a first exterior coating; the first exterior coating includes a three-layer structure coating and a plastic substrate; the first interior coating includes a two-layer coating structure and a plastic substrate; the second interior coating includes a two-layer coating structure and a metal substrate; and the third interior coating is a single-layer coating structure and a plastic substrate.

[0031] Specifically, the coating system is matched according to the material of the substrate and the application scenario, including: a three-layer coating structure for exterior plastic substrates, which includes a primer, a color coat and a clear coat from the inside out; a two-layer coating structure for interior plastic substrates, which includes a color coat and a clear coat from the inside out; a two-layer coating structure for interior metal substrates, which includes a color coat and a clear coat from the inside out; and a single-layer coating structure for interior plastic substrates.

[0032] For example, the following coating system is determined based on the material properties of the substrate to be coated and the weather resistance requirements of the interior and exterior painted parts: The first exterior coating consists of a three-layer structured coating and a plastic substrate, with the coating facing outwards. The three-layer structured coating includes: a gray primer, a color paint that reflects the coating color, and a clear varnish, layered sequentially. The primer's main raw material is a hydroxyl acrylic resin 2K system, with a spray thickness of 8-15μm; the color paint's main raw material is an acrylic + polyester resin 1K system, with a spray thickness of 8-28μm; and the clear varnish's main raw material is a hydroxyl acrylic resin 2K system, with a spray thickness of 25-45μm.

[0033] The first interior coating comprises a two-layer structured coating and a plastic substrate, with the coating facing outwards. The two-layer structured coating comprises, in sequence, a color paint and a clear varnish that reflect the coating color. The color paint layer is an acrylic resin 2K system with a coating thickness of 12-15 μm, and the clear varnish is a polyurethane 2K system with a coating thickness of 23-25 ​​μm. The second interior coating comprises a two-layer structured coating and a metal substrate, with the coating facing outwards. The two-layer structured coating comprises a color paint and a clear varnish, which are stacked sequentially to reflect the color of the coating; both are based on the amino alkyd resin 2K system, with the color paint layer having a thickness of 12-15μm and the clear varnish layer having a thickness of 23-25μm. The third interior coating includes: a structural coating and a plastic substrate. This colored coating enables adhesion to the substrate, reflects the coating color, and provides the coating with weather resistance. The specific components include an acrylic resin 2K system, and the coating thickness is 20-25 μm.

[0034] Step S12: Based on the weather resistance requirements of different parts, use a coating system to adjust the target body color to form a differentiated coating formula.

[0035] The weather resistance requirement of a component refers to its ability to maintain its structural integrity, functional performance, and appearance quality when exposed to natural or artificial environmental conditions for a long period of time. Weather resistance requirements are set differently based on the component's location of use (exterior / interior), substrate type (plastic / metal), and service environment (temperature, humidity, ultraviolet radiation, salt spray, etc.).

[0036] In one embodiment, based on the weather resistance requirements of different parts inside the vehicle, different coating systems are selected and the target body color used as the verification sample is adjusted to determine the coating formula.

[0037] To ensure the sufficiency of the verification, at least ten body colors were selected for verification. Therefore, at least ten body colors were required to be prepared when preparing the target body colors used as verification samples.

[0038] Specifically, the vehicle body color includes a variety of exterior colors. When formulating the coating, a multi-angle colorimeter and a gloss meter must be used for measurement, and the color difference between the formulated color swatch and the standard color swatch must meet the following requirements: ΔL is ±0.25, Δa is ±0.15, Δb is ±0.15, and the gloss deviation is ±2°.

[0039] In one embodiment, the resin system in the coating system is selected according to the application. Generally, exterior coatings use hydroxyl acrylic resins or polyurethane resin systems, while interior coatings use acrylic resins, polyurethane resins, or amino alkyd resin systems.

[0040] Step S13: Conduct a comprehensive performance test on at least one target body color, and obtain the type of target pigment used for the target body color when the test is passed.

[0041] The color pigments can be used for both exterior and interior trim. Exterior color pigments include: white, muddy yellow, medium yellow, green, black, brick red, magenta, blue, rose red, pure yellow, purple, extra black, scarlet, bright red, and tinted black. Interior color pigments include: black, sky blue, purple, red, iron red, lemon yellow, and white. In other words, the color pigments include, but are not limited to, at least one of the following: white, muddy yellow, medium yellow, green, black, brick red, magenta, blue, rose red, pure yellow, purple, extra black, scarlet, bright red, tinted black, sky blue, red, iron red, and lemon yellow.

[0042] Optionally, target vehicle body colors with a wide range of applications can be collected as verification samples, specifically including: exterior: pollen yellow, apricot yellow, Hetian jade, rich rust, gentian blue, cool-toned matcha, midnight plum, Italian panna cotta, extraordinary pink, classic brownish gray, force blue and durable gray, etc.; interior: matte black, cognac brown, starry blue, piano black, electroplated silver, flowing mercury, titanium gray, floating silver, Nick gray, sky silver, metallic gray, flashing silver gray, Martian gray, brocade gray, lamplight brown, titanium crystal gray and sci-fi silver, etc.

[0043] The comprehensive performance test includes tests such as light aging resistance test, heat aging resistance test, chemical resistance test, water resistance test, and stone impact resistance test.

[0044] Specifically, the requirements and standards for comprehensive performance testing are as follows: Light aging resistance: Tested according to GB / T 1865 standard, the light aging resistance is expressed by the xenon lamp irradiation time when the gray level reaches below 4 and the gloss loss rate reaches above 15%. In this verification method, the exterior is judged to be qualified after 2000h and the interior is judged to be qualified after 650h.

[0045] Heat resistance aging: Tested according to GB / T 23989 standard, the heat resistance aging is expressed by the high temperature baking time when the gray level reaches below 4 and the gloss loss rate reaches above 15%. In this verification method, the interior and exterior surfaces are judged to be qualified after 500h.

[0046] Chemical resistance: Tested according to GB / T 9274-1988 standard, the coating appearance showed no change.

[0047] Water resistance: Tested according to GB / T 5209 standard, at 40℃ for 10 days, and observe the changes in the appearance of the coating.

[0048] Stone chip resistance: The coating peeling grade is tested according to the QEQY-252-2009 standard.

[0049] For example, four target vehicle body colors were randomly selected for verification, specifically: an apricot yellow and a deep rust color for the exterior using a three-layer structured coating and a plastic substrate; a metallic gray for the interior using a two-layer structured coating and a plastic substrate; a matte black for the interior using a two-layer structured coating and a metallic substrate; and a splendid gray for the interior using a single-layer structured coating and a plastic substrate. Testing confirmed that the performance of all the above coatings met the requirements, and the coating system was deemed feasible. The target vehicle body colors that passed the tests can be used for subsequent verification.

[0050]

[0051] Step S14: Obtain the ratio of pigment to binder in the paint layer of the tested coating formulation, and take the maximum value of the ratio as the limiting pigment-to-binder ratio.

[0052] In coatings, the binder refers to the main component that forms a continuous film, also known as resin or binder, and determines the basic mechanical and durability properties of the coating. Pigments are solid particles in coatings used to impart color, hiding power, or special functions; they are insoluble in the medium but can be uniformly dispersed. The pigment-to-binder ratio refers to the ratio of the mass of pigment to the mass of binder (film-forming substance) in the coating formulation.

[0053] Specifically, the limiting pigment-to-binder ratio is determined by the maximum ratio of total pigment content to total binder content across all combinations in cross-testing of multiple substrates, multiple color pastes, and multiple coating structures. This ratio serves as a threshold for judging the weather resistance of the system; it is derived from objective experimental data and not subjectively set.

[0054] It should be noted that the coating formula that passed the test refers to the target body color that passed the comprehensive performance test mentioned above.

[0055] In one embodiment, the base material content is the sum of the solid content of the main resin and the solid content of the curing agent in the paint layer; the pigment content is the total amount of pigment paste, filler, metallic pigment and pearlescent pigment added in the paint layer.

[0056] Specifically, the pigment-to-base ratio (pigment-to-base ratio) is calculated only for the coating layer that displays the color, while the base content is the sum of the solid content of the main resin and the solid content of the curing agent, and the pigment content is the total amount of color paste, filler, metallic pigment and pearlescent pigment added.

[0057] In one embodiment, the limiting pigment-to-binder ratio determined for the first exterior coating is 1; the limiting pigment-to-binder ratio determined for the interior coating is 0.85, and the interior coating includes a first interior coating, a second interior coating, and a third interior coating.

[0058] Step S15: Combine the coating system with the target pigment type and adjust it according to the limiting pigment-to-binder ratio. Then, verify the weather resistance of the adjusted test coating.

[0059] Specifically, the coating with the fixed primer / varnish formulation is combined with each colorant one by one and mixed according to the maximum pigment-to-binder ratio. The mixed coating is then subjected to weather resistance verification, including resistance to light aging and heat aging.

[0060] In one embodiment, the coating system is combined with the target colorant type and formulated according to the limiting pigment-to-binder ratio, including: for a three-layer coating, using a primer and clear coat that have passed the comprehensive performance test as a fixed top and bottom layer, and formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio; for a two-layer coating, using a clear coat that has passed the comprehensive performance test as a fixed top layer, and formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio; for a single-layer coating, formulating a single colorant as a paint layer according to the limiting pigment-to-binder ratio.

[0061] This embodiment uses a proven and mature primer / clear coat system, and is combined with high-performance color pastes that can still pass the weather resistance test under the maximum pigment-to-binder ratio conditions, thereby ensuring that the entire coating system still has excellent weather resistance after any combination of color pastes (not exceeding the maximum pigment-to-binder ratio).

[0062] In one embodiment, the coating system is combined with the target color paste type and formulated according to the limiting pigment-to-binder ratio. The formulated test coating is then subjected to weather resistance verification, including: using the color paste that passes the weather resistance verification as a high-performance color paste; combining the coating system with the high-performance color paste to obtain a target formulated color coating; and confirming that the target formulated color coating meets the preset weather resistance requirements when the pigment-to-binder ratio in the target formulated color coating does not exceed the limiting pigment-to-binder ratio.

[0063] By conducting weather resistance tests on single color paste combinations at the limiting pigment-to-binder ratio, qualified color pastes are selected as high-performance color pastes. This allows all subsequent combinations using this high-performance color paste with a pigment-to-binder ratio ≤ the limiting value to be directly judged as having qualified weather resistance, without the need for repeated testing.

[0064] By using the above methods, the test sample size is reduced from "number of colors × number of substrates × number of coating structures" to "number of color pastes + a small number of verification combinations", shortening the test cycle by more than 40% and reducing costs by more than 65%.

[0065] For example, a primer / clear coat system with a fixed coating was used, and color paste combinations were randomly selected to form different verification colors. Performance tests were conducted on each color, including tests for weather resistance, chemical resistance, and stone impact resistance. The test results showed that each coating had good weather resistance, and the conclusion was correct. The specific details are shown in the table below.

[0066]

[0067] Please see Figure 3 , Figure 3 This is a schematic diagram of the test results of an embodiment of the present invention.

[0068] like Figure 3 As shown, Examples 1-15 are color pastes and three-structure coating systems that still exhibit good weather resistance even at the limit pigment-to-binder ratio. Weather resistance criteria can be found in the requirements and standards for comprehensive performance testing. The three-structure coating is illustrated in the diagram. Figure 2 As shown in a, the specific steps are as follows: 1. Wipe the surface of the plastic substrate with isopropyl alcohol to remove oil stains; 2. The primer layer uses hydroxyl acrylic resin 2K system, with a spray thickness of 8-15μm, and leveling and surface drying in 10min; 3. The color paint layer uses an acrylic + polyester resin 1K system. Fifteen color pastes were used individually: white, mud yellow, medium yellow, green, black, brick red, purple red, blue, rose red, clear yellow, purple, special black, scarlet, bright red, and tinted black. The color paint was prepared with a pigment-to-binder ratio of 0.81. Each color paint contained only one color paste. A total of 15 verification samples were prepared. The spraying thickness was 8-15μm, and the leveling and surface drying time was 10min. 4. The varnish layer uses hydroxyl acrylic resin 2K system, with a spray thickness of 25-45μm, and leveling and surface drying in 10min; 5. After coating, bake in a high-temperature oven at 75℃ for 4 hours.

[0069] Specifically, Examples 16-22 are color pastes and two-structure coating systems that still exhibit good weather resistance at the limit pigment-to-binder ratio. The weather resistance criteria can be found in the requirements and standards for the comprehensive performance test described above. The two-structure coating is illustrated in the diagram. Figure 2As shown in b, the specific steps are as follows: 1. Wipe the surface of the plastic substrate with isopropyl alcohol to remove oil stains; 2. The color paint layer uses the 2K acrylic resin system. Seven color pastes, namely black, light blue, purple, red, iron red, lemon yellow and white, are used separately. The color paint is prepared with a pigment-to-binder ratio of 0.81. Each color paint contains only one color paste. There are a total of 7 verification samples. The spraying thickness is 12-15μm, and the leveling and surface drying time is 10min. 3. The clear coat uses a 2K polyurethane resin system, with a spray thickness of 23-25μm, and a leveling and surface drying time of 10 minutes. 4. Post-coating treatment: bake in a high-temperature oven at 75℃ for 4 hours.

[0070] Specifically, Examples 23-29 are color pastes and two-structure coating systems that still exhibit good weather resistance at the limit pigment-to-binder ratio. The weather resistance criteria can be found in the requirements and standards for the comprehensive performance test described above. The two-structure coating is illustrated in the diagram. Figure 2 As shown in b, the specific steps are as follows: 1. Place the metal substrate in a high-temperature oven and bake at 100℃ for 4 hours. Wipe off any surface stains after baking. 2. The paint layer uses the amino alkyd resin 2K system. Seven color pastes, namely black, light blue, purple, red, iron red, lemon yellow and white, are used to prepare the paint separately. The paint is prepared with a pigment-to-binder ratio of 0.81. Each paint contains only one color paste. There are a total of 7 verification samples. The spraying thickness is 12-15μm and the leveling and surface drying time is 10min. 3. The clear coat uses an amino alkyd resin 2K system, with a spray thickness of 23-25μm, and a leveling and surface drying time of 10min. 4. Post-coating treatment: bake in a high-temperature oven at 75℃ for 4 hours.

[0071] Specifically, Examples 30-36 are color pastes and single-structure coating systems that still exhibit good weather resistance at the limit pigment-to-binder ratio. The weather resistance criteria can be found in the requirements and standards for the comprehensive performance test described above. Two-structure coatings are illustrated below. Figure 2 As shown in c, the specific steps are as follows: 1. Wipe the surface of the plastic substrate with isopropyl alcohol to remove oil stains; 2. The color paint layer uses the 2K acrylic resin system. Seven color pastes, namely black, light blue, purple, red, iron red, lemon yellow and white, are used to prepare the paint separately. The color paint is prepared with a pigment-to-binder ratio of 0.81. Each color paint contains only one color paste. There are a total of 7 verification samples. The spraying thickness is 20-25μm, and the leveling and surface drying time is 10min. 3. Post-coating treatment: bake in a high-temperature oven at 75℃ for 4 hours.

[0072] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the accompanying drawings may include multiple sub-steps or multiple stages, which are not necessarily completed at the same time, but may be executed at different times, and their execution order is not necessarily sequential, but may be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0073] Through the above description of the embodiments, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented in hardware or by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions of the embodiments of the present invention can be embodied in the form of a software product. This software product can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various implementation scenarios of the embodiments of the present invention.

[0074] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. The above embodiments and accompanying drawings are exemplary. The modules or processes in the accompanying drawings are not necessarily necessary for implementing the embodiments of the present invention and should not be construed as limiting the present invention. Within the scope of the technical concept of the present invention, various simple modifications and combinations can be made to the technical solutions of the present invention, and these simple modifications and combinations all fall within the protection scope of the present invention.

Claims

1. A method for verifying the weather resistance of a coating, characterized in that, include: The corresponding coating system is determined based on the selected substrate. Based on the weather resistance requirements of different parts, the target body color is formulated using the coating system to create a differentiated coating formula; At least one of the target body colors is subjected to a comprehensive performance test, and the type of target pigment used in the target body color is obtained when the test is passed. Obtain the ratio of pigment to binder in the paint layer of the coating formulation that has passed the test, and take the maximum value of the ratio as the limiting pigment-to-binder ratio; The coating system is combined with the target pigment type and adjusted according to the limiting pigment-to-binder ratio. The adjusted test coating is then subjected to weather resistance verification.

2. The coating weather resistance verification method as described in claim 1, characterized in that, The types of substrates to be coated include: plastic substrates and metal substrates.

3. The coating weather resistance verification method as described in claim 2, characterized in that, The coating system includes: a first interior coating, a second interior coating, a third interior coating, and a first exterior coating; The first exterior coating comprises a three-layer structure coating and a plastic substrate; The first interior coating comprises a two-layer coating structure and a plastic substrate; The second interior coating comprises a two-layer coating structure and a metal substrate; The third interior coating is a single-layer coating structure and a plastic substrate.

4. The coating weather resistance verification method as described in claim 1, characterized in that, The comprehensive performance test includes at least one of the following: light aging resistance test, heat aging resistance test, chemical resistance test, water resistance test, and stone impact resistance test.

5. The coating weather resistance verification method as described in claim 1, characterized in that, The base material content is the sum of the solid content of the main resin in the paint layer and the solid content of the curing agent; The pigment content refers to the total amount of pigment paste, filler, metallic pigment, and pearlescent pigment added to the paint layer.

6. The coating weather resistance verification method as described in claim 3, characterized in that, The limiting pigment-to-binder ratio determined for the first exterior coating is 1; The limiting pigment-to-binder ratio determined for the interior coating is 0.85, and the interior coating includes a first interior coating, a second interior coating, and a third interior coating.

7. The coating weather resistance verification method as described in claim 3 or 6, characterized in that, The step of combining the coating system with the target pigment type and adjusting it according to the limiting pigment-to-binder ratio includes: For the three-layer coating structure, the primer and clear coat that have passed the comprehensive performance test are used as the fixed top and bottom layers, and a single color paste is prepared according to the limit pigment-to-binder ratio as the color paint layer. For the two-layer coating structure, a clear varnish that has passed the comprehensive performance test is used as a fixed top layer, and a single color paste is prepared according to the limit pigment-to-binder ratio as a color paint layer. For single-layer coatings, a single colorant is prepared as a paint layer according to the aforementioned limiting pigment-to-binder ratio.

8. The coating weather resistance verification method as described in claim 1, characterized in that, The step of combining the coating system with the target pigment type and adjusting it according to the limiting pigment-to-binder ratio, and then verifying the weather resistance of the adjusted test coating includes: The color paste that passes the weather resistance test will be used as a high-performance color paste. The coating system is combined with the high-performance colorant to obtain a target-mixed color coating; When the pigment-to-base ratio in the target color coating does not exceed the limit pigment-to-base ratio, the target color coating is confirmed to meet the preset weather resistance requirements.

9. A coating system, characterized in that, The coating system and color paste combination selected by the coating weather resistance verification method as described in any one of claims 1 to 8 are used to prepare the coating.

10. A car body component, characterized in that, Its surface is coated with the coating system as described in claim 9.

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