Preparation method for improving brilliance and durability of yellow coating with assistance of photonic crystals

Abstract

The invention discloses a preparation method for improving brilliance and durability of a yellow coating with assistance of photonic crystals, and relates to the technical field of coatings. The coating is composed of a photonic crystal coating constructed by ZnS and SiO2 nanoparticles and a polyester coating containing benzidine yellow. The method comprises the following steps: preparing benzidine yellow paste; dispersing the yellow paste into polyester resin to prepare a bright yellow prime paint; preparing a photonic crystal precursor solution of ZnS and SiO2 nanoparticles, coating the surface of the prime paint with the photonic crystal precursor solution, and heating and self-assembling to form a photonic crystal surface paint; through the interference enhancement mechanism of the photonic crystal, the color brightness of the prime paint is remarkably improved, meanwhile, the surface layer of the photonic crystal effectively blocks ultraviolet rays and oxygen, the anti-aging performance of the paint is remarkably improved, and the color is more stable and durable. The color enhancement and long-acting protection of the yellow coating are realized, and the yellow coating is suitable for the fields of building decoration, automobile coating, home protection and the like, and has wide application value.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a preparation method for improving the brightness and durability of yellow coatings with the assistance of photonic crystals. Background Art

[0002] Yellow paint is widely used in architectural decoration, automobile painting and home protection, and is favored for its bright, eye-catching and highly decorative characteristics. However, traditional yellow paint usually has problems such as insufficient color vividness and poor weather resistance. Especially when exposed to sunlight, oxygen and moisture for a long time, the paint color is prone to fading, loss of gloss or aging; these defects seriously affect the actual service life and visual effect of yellow paint.

[0003] In the prior art, although the weather resistance and color stability of coatings have been improved to a certain extent by optimizing the chemical composition of pigments and coating substrates, and introducing anti-ultraviolet agents and antioxidant additives, it is still difficult to overcome the following technical difficulties: (1) Insufficient color vividness: The light absorption characteristics of yellow pigments in coatings are usually weak, resulting in the color saturation and brightness of the coatings being not significant enough, making it difficult to meet the demand for highly decorative coatings; (2) Unsatisfactory durability: Ultraviolet rays and oxygen can cause the chemical bonds of pigment molecules in the coating to break, thereby causing color degradation; even if anti-aging agents are added, traditional coatings still have difficulty maintaining color stability under long-term exposure conditions; (3) Limited UV blocking effect: The coating surface layer has insufficient UV shielding ability, and direct UV transmission will accelerate the aging of the underlying coating and affect the overall coating performance; (4) Lack of innovative structural design: Traditional coatings only improve performance through chemical modification or additives, but do not fully utilize the physical structural characteristics of the coating to optimize optical properties and weather resistance.

[0004] In recent years, photonic crystals, as a functional material with periodic nanostructures, have attracted widespread attention in the field of optical regulation. Through their structural color effect, photonic crystals can precisely control the interference and reflection of light, showing excellent optical properties. Studies have shown that the interference enhancement mechanism of photonic crystals can significantly improve the color vividness of paints. In addition, the photonic crystal structure has a natural UV shielding ability, which can effectively slow down the aging process of the underlying paint. However, the application of photonic crystals in paints is still in the exploratory stage, especially in terms of how to achieve efficient integration with the paint base and optimize its preparation process. There is still a lack of systematic solutions. Therefore, the preparation method of photonic crystals to assist in improving the brightness and durability of yellow paints provided in this scheme has important practical significance. Summary of the invention

[0005] The present invention provides a preparation method for improving the brightness and durability of yellow paint with the assistance of photonic crystals, aiming to significantly improve the brightness of the yellow paint through the interference enhancement effect of the photonic crystals, and at the same time greatly improve the durability of the paint through the ultraviolet and oxygen barrier effect of the surface layer of the photonic crystals; while this scheme achieves a significant improvement in the performance of the yellow paint, the manufacturing process is simple and has excellent economy, and is suitable for practical applications in a variety of fields, and has broad market application prospects.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The preparation method of the photonic crystal-assisted yellow paint for improving the brightness and durability of the yellow paint comprises the following steps:

[0008] S1, preparing benzidine yellow slurry;

[0009] S2, adding benzidine yellow slurry to the polyester resin coating according to the mass ratio to prepare a bright yellow coating as a base layer; the addition ratio of benzidine yellow slurry is 0.5-2.0% of the polyester resin coating;

[0010] S3. Prepare a photonic crystal precursor solution of ZnS and SiO2 nanoparticles, and apply it on the surface of the bright yellow coating. After self-heating and self-assembly, a photonic crystal coating is obtained as the surface layer, thereby forming a composite coating.

[0011] Furthermore, the S1 step is specifically as follows, calculated by mass ratio:

[0012] 0.5-2% of dispersant, 10-20% of solvent and 0-2% of defoamer are added to 30-60% of resin, and the mixture is uniformly stirred at low speed. 20-50% of color powder is slowly added to the mixture under low speed stirring, and the color powder is benzidine yellow, and the mixture is dispersed by ultrasound, sand milling or ball milling.

[0013] Furthermore, the resin is one or more combinations of polyurethane resin, acrylic resin, epoxy resin, phenolic resin, and polyester resin; the defoaming agent is one or more combinations of methyl silicone oil, ether ester compounds, modified mineral oil, polyoxyethyl glycerol ether, small molecule metal organic matter, and modified silicone polymer; the temperature resistance of the benzidine yellow is 180-200°C, the light resistance is 5, the acid resistance is 5, the alkali resistance is 5, and the oil absorption is ≤45.

[0014] Furthermore, the polyester resin coating is prepared by the following steps, calculated by mass percentage: adding 20-50% titanium dioxide, 2-10% amino resin, 0.1-1% blocked acid catalyst, 0.1-1% leveling agent, 0.1-1% dispersant and 5-20% solvent to 20-60% polyester resin, first stirring evenly at low speed, and then dispersing at high speed, the rotation speed is 2000-3000r / min, and the time is 10-30min.

[0015] Furthermore, the polyester resin is a polyester prepolymer, with an acid value of 3-5 KOHmg / g, an OH value of 9-12 KOHmg / g, and a density of 1.20-1.35 g / cm at 30°C. 3 ; The titanium dioxide particle size is 200-300nm, the oil absorption is ≤23g / 100g, and the effective ingredient is ≥97%; the amino resin is a methyl etherified melamine resin, with a viscosity of 600-1200cps and a solid content of 78-82%; the blocked acid catalyst is a sulfonic acid catalyst; the leveling agent is one or more combinations of ethylene glycol butyl ether, cellulose acetate, polyacrylates, silicone oil or silicone compounds.

[0016] Furthermore, the dispersant is one or more combinations of dodecyl sulfate, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, and polyvinyl pyrrolidone; and the solvent is one or more combinations of ethylene glycol butyl ether, propylene glycol methyl ether acetate, and 3-ethoxyethyl propionate.

[0017] Furthermore, in the S3 step, the photonic crystal precursor solution is prepared as follows, in terms of mass percentage: ZnS and SiO2 nanoparticles are added to a solvent in a predetermined mass ratio, and the solution is treated using an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration, and the temperature is controlled between room temperature and 50°C; the particle size of the ZnS is 20-100nm, and the particle size of the SiO2 is 30-150nm; the solvent is water or an alcohol solvent; the mass ratio of the ZnS and SiO2 is 1:1 to 1:2, and the concentration range of the precursor solution is 10-30g / L.

[0018] Furthermore, the coating thickness of the bright yellow coating is 5-15 μm, and the curing conditions are 160-190° C., 5-15 min; the coating thickness of the photonic crystal precursor solution is 5-20 μm; the temperature of the heating self-assembly is 80-150° C., and the heating time is 1-3 hours;

[0019] Furthermore, the surface photonic crystal coating of the composite coating has a significant structural color effect, its color is bright yellow, and it has excellent durability;

[0020] Furthermore, the composite coating has good UV resistance, and its UV transmittance is less than 10%;

[0021] Furthermore, the composite coating has weather resistance, and after >500 hours of accelerated aging test, the bright yellow color retention rate is not less than 90%;

[0022] Furthermore, the composite coating is suitable for the fields of building decoration, automobile painting or home protection, and has good economic efficiency and broad market application prospects.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) Significantly improve the color vividness of yellow paint Through the interference enhancement mechanism of photonic crystals, the color saturation and brightness of benzidine yellow paint are effectively improved, making the coating present a brighter and more vivid visual effect;

[0025] (2) Excellent anti-aging performance: The surface layer of photonic crystals can effectively block ultraviolet rays and oxygen, reduce the photo-oxidation and chemical degradation of pigment molecules in the base coating, and significantly extend the service life of the coating. After > 500 hours of accelerated aging test, the bright yellow retention rate is still higher than 90%, which is much better than traditional yellow coatings;

[0026] (3) Enhance the structural protection of the coating: The surface of the photonic crystal forms a dense protective layer, which reduces the damage to the coating caused by the external environment such as moisture, temperature changes and mechanical stress, thereby improving the weather resistance and stability of the overall coating;

[0027] (4) Good UV shielding performance: Photonic crystal coating has a natural blocking effect on ultraviolet light, with a UV transmittance of less than 10%, which can effectively protect the underlying coating and substrate and reduce the damage of ultraviolet light to the coating.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The preparation method of the photonic crystal-assisted yellow paint for improving the brightness and durability of the yellow paint comprises the following steps:

[0031] (1) Preparation of benzidine yellow slurry: According to the mass ratio, add 0.5-2.0% dispersant, 10-20% solvent and 0-2% defoamer to 30-60% resin, stir at low speed to obtain a mixture; slowly add 20-50% benzidine yellow powder to the mixture under low speed stirring, and disperse by ball milling, the speed of the sand mill is 2000-3000 rad / min, and the time is 10-30min. The medium is zirconium dioxide beads with a particle size of 0.02-0.08mm.

[0032] (2) Preparation of polyester coating: According to the mass ratio, add 20-50% titanium dioxide, 2-10% amino resin, 0.1-1.0% blocked acid catalyst, 0.1-1.0% leveling agent, 0.1-1.0% dispersant, and 5-20% solvent (13) to 20-60% polyester resin. First stir at a low speed to make it uniform, and then disperse at a high speed, the rotation speed is 2000-3000rad / min, and the time is 10-30min.

[0033] (3) Preparation of bright yellow paint: Add 0.5-2.0% benzidine yellow slurry to the polyester paint according to the mass ratio, stir at high speed, the speed is 800-1500 rad / min, and the time is 1-5 min.

[0034] (4) Preparation of bright yellow coating: The bright yellow coating is applied on the substrate, the coating thickness is controlled at 5-15 μm, the curing temperature is 160-190° C., and the curing time is 5-15 min.

[0035] (5) Photonic crystal precursor solution: 20-100 nm ZnS and 30-150 nm SiO2 nanoparticles are added to ethanol at a mass ratio of 1:1-2:1. The solution is treated with an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration. The temperature is controlled between room temperature and 50 °C, and the concentration range is usually 10-30 g / L.

[0036] (6) Photonic crystal coating: The photonic crystal precursor solution is applied to the surface of the bright yellow coating, the self-assembly temperature is 80 to 150° C., and the heating time is 1 to 3 hours; the coating thickness is controlled at 5 to 20 μm.

[0037] Embodiment 1:

[0038] (1) Preparation of benzidine yellow slurry: According to the mass ratio, 1.2% dispersant, 12.8% solvent and 1.0% defoamer are added to 45% resin, and the mixture is uniformly stirred at a low speed; 40% yellow toner is slowly added to the mixture under low-speed stirring, and dispersed by ball milling, the speed of the sand mill is 3000 rad / min, and the time is 25 min; zirconium dioxide beads are selected as the medium, and the particle size is 0.05 mm.

[0039] (2) Preparation of polyester coating: According to the mass ratio, 38% titanium dioxide, 6.0% amino resin, 0.2% blocked acid catalyst, 0.5% leveling agent, 0.8% dispersant and 8.5% solvent were added to 46% polyester resin, and the mixture was first stirred at a low speed and then dispersed at a high speed at a speed of 3000 rad / min for 15 min.

[0040] (3) Preparation of bright yellow coating: Add 1.0% benzidine yellow slurry to the polyester coating according to the mass ratio, and stir at high speed at a speed of 1200 rad / min for 3 min.

[0041] (4) Preparation of bright yellow coating: The bright yellow coating was coated on the substrate, the coating thickness was controlled at 9.0 μm, the curing temperature was 180° C., and the curing time was 10 min.

[0042] Embodiment 2:

[0043] (1) Preparation of benzidine yellow slurry: According to the mass ratio, 1.2% dispersant, 12.8% solvent and 1.0% defoamer were added to 45% resin, and the mixture was uniformly stirred at a low speed; 40% benzidine yellow toner was slowly added to the mixture under low-speed stirring, and dispersed by ball milling, the speed of the sand mill was 3000 rad / min, and the time was 25 minutes. Zirconium dioxide beads were selected as the medium, and the particle size was 0.05 mm.

[0044] (2) Preparation of polyester coating: According to the mass ratio, 38% titanium dioxide, 6.0% amino resin, 0.2% blocked acid catalyst, 0.5% leveling agent, 0.8% dispersant and 8.5% solvent were added to 46% polyester resin, and the mixture was first stirred at a low speed and then dispersed at a high speed at a speed of 3000 rad / min for 15 min.

[0045] (3) Preparation of bright yellow coating: Add 1.0% benzidine yellow slurry to the polyester coating according to the mass ratio, and stir at high speed at a speed of 1200 rad / min for 3 min.

[0046] (4) Preparation of bright yellow coating: The bright yellow coating was coated on the substrate, the coating thickness was controlled at 9.0 μm, the curing temperature was 180° C., and the curing time was 10 min.

[0047] (5) Photonic crystal precursor solution: 50 nm ZnS and 70 nm SiO2 nanoparticles were added to ethanol at a mass ratio of 1:1.5. The solution was treated with an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration. The temperature was controlled at 35 °C and the concentration was 18 g / L.

[0048] (6) Photonic crystal coating: The photonic crystal precursor solution is coated on the bright yellow coating surface, the self-assembly temperature is 120°C, the heating time is 1.5 hours, and the coating thickness is controlled at 7.0 μm.

[0049] Embodiment 3:

[0050] (1) Preparation of benzidine yellow slurry: According to the mass ratio, 1.2% dispersant, 12.8% solvent and 1.0% defoamer were added to 45% resin, and the mixture was uniformly stirred at a low speed; 40% yellow toner was slowly added to the mixture under low-speed stirring, and dispersed by ball milling, with the speed of the sand mill being 3000 rad / min and the time being 25 min. Zirconium dioxide beads were selected as the medium, and the particle size was 0.05 mm.

[0051] (2) Preparation of polyester coating: According to the mass ratio, 38% titanium dioxide, 6.0% amino resin, 0.2% blocked acid catalyst, 0.5% leveling agent, 0.8% dispersant and 8.5% solvent were added to 46% polyester resin, and the mixture was first stirred at a low speed and then dispersed at a high speed at a speed of 3000 rad / min for 15 min.

[0052] (3) Preparation of bright yellow paint: Add 1.5% benzidine yellow slurry to the polyester paint according to the mass ratio, and stir at high speed at a speed of 1200 rad / min for 3 min.

[0053] (4) Preparation of bright yellow coating: The bright yellow coating was coated on the substrate, the coating thickness was controlled at 10.0 μm, the curing temperature was 180° C., and the curing time was 10 min.

[0054] (5) Photonic crystal precursor solution: 50 nm ZnS and 70 nm SiO2 nanoparticles were added to ethanol at a mass ratio of 1:1.7. The solution was treated with an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration. The temperature was controlled at 35 °C and the concentration was 18 g / L.

[0055] (6) Photonic crystal coating: The photonic crystal precursor solution is coated on the bright yellow coating surface, the self-assembly temperature is 120°C, the heating time is 1.5 hours, and the coating thickness is controlled at 7.0 μm.

[0056] Embodiment 4:

[0057] (1) Preparation of benzidine yellow slurry: According to the mass ratio, 1.2% dispersant, 12.8% solvent and 1.0% defoamer were added to 45% resin, and the mixture was uniformly stirred at a low speed; 40% yellow toner was slowly added to the mixture under low-speed stirring, and dispersed by ball milling, with the speed of the sand mill being 3000 rad / min and the time being 25 min. Zirconium dioxide beads were selected as the medium, and the particle size was 0.05 mm.

[0058] (2) Preparation of polyester coating: According to the mass ratio, 38% titanium dioxide, 6.0% amino resin, 0.2% blocked acid catalyst, 0.5% leveling agent, 0.8% dispersant and 8.5% solvent were added to 46% polyester resin, and the mixture was first stirred at a low speed and then dispersed at a high speed at a speed of 3000 rad / min for 15 min.

[0059] (3) Preparation of bright yellow paint: Add 1.5% benzidine yellow slurry to the polyester paint according to the mass ratio, and stir at high speed at a speed of 1200 rad / min for 3 min.

[0060] (4) Preparation of bright yellow coating: The bright yellow coating was coated on the substrate, the coating thickness was controlled at 10.0 μm, the curing temperature was 180° C., and the curing time was 10 min.

[0061] (5) Photonic crystal precursor solution: 50 nm ZnS and 70 nm SiO2 nanoparticles were added to ethanol at a mass ratio of 1:1.8. The solution was treated with an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration. The temperature was controlled at 35 °C and the concentration was 20 g / L.

[0062] (6) Photonic crystal coating: The photonic crystal precursor solution is coated on the bright yellow coating surface, the self-assembly temperature is 140°C, the heating time is 2.0 hours, and the coating thickness is controlled at 8.5 μm.

[0063] Test example:

[0064] Examples 1-4 were subjected to UV transmittance, aging resistance, chemical corrosion resistance, and bending tests.

[0065] UV transmittance: tested using a UV-visible spectrophotometer

[0066] Aging resistance: refer to standard GB / T14522-2008, carry out aging resistance test on the coating, record the appearance of the coating (bubbling, peeling, cracking) every 12 hours, record the gloss retention rate and yellow hue retention rate.

[0067] Chemical corrosion resistance: refer to standard GB / T1771-2007, conduct chemical corrosion resistance test on the coating, record the appearance of the coating (blistering, peeling, cracking) every 12 hours, record the gloss retention rate and yellow hue retention rate.

[0068] Bending test: Refer to standard GB / T13448, bend the coating under certain conditions, record the cracking and peeling of the coating and the peeling of the coating after the tape is adhered. It can be used to evaluate the flexibility and adhesion of the coating.

[0069] As can be seen from Table 1, after 324h of aging resistance test, the gloss retention rate of Example 1 was 44.0%, and the yellow hue retention rate was 69.8%. After 348h of chemical corrosion resistance test, the gloss retention rate was 41.6%, and the yellow hue retention rate was 68.2%. After 420h of aging resistance test, the gloss retention rate of Example 2 was 77.7%, and the yellow hue retention rate was 79.8%. After 432h of chemical corrosion resistance test, the gloss retention rate was 75.3%, and the yellow hue retention rate was 80.2%. After 468h of aging resistance test, the gloss retention rate of Example 3 was 83.1%, and the yellow hue retention rate was 88.3%. After 480h of chemical corrosion resistance test, the gloss retention rate was 80.6%, and the yellow hue retention rate was 89.8%. After 516h of aging resistance test, the gloss retention rate of Example 4 was 91.2%, and the yellow hue retention rate was 92.5%. After 504h of chemical corrosion resistance test, the gloss retention rate was 89.4%, and the yellow hue retention rate was 91.6%.

[0070] This proves that the photonic crystal surface coating prepared with ZnS and SiO2 nanoparticles can significantly improve the color vividness of the underlying coating through the interference enhancement mechanism of photonic crystals. At the same time, the photonic crystal surface effectively blocks ultraviolet rays and oxygen, significantly improving the coating's anti-aging and chemical corrosion resistance, making the coating's gloss and color more stable and durable.

[0071]

[0072] Table 1: Performance test table

[0073] The performance advantages of this technical solution are as follows:

[0074] Significantly improve the color vividness of yellow paint Through the interference enhancement mechanism of photonic crystals, the color saturation and brightness of benzidine yellow paint are effectively improved, making the coating present a brighter and more vivid visual effect.

[0075] Excellent anti-aging performance: The photonic crystal surface can effectively block ultraviolet rays and oxygen, reduce the photo-oxidation and chemical degradation of pigment molecules in the bottom coating, and greatly extend the service life of the coating. After > 500 hours of accelerated aging test, the bright yellow retention rate is still higher than 90%, which is much better than traditional yellow coatings.

[0076] Enhance the structural protection of the coating: The surface of the photonic crystal forms a dense protective layer, which reduces the damage to the coating caused by the external environment such as moisture, temperature changes and mechanical stress, thereby improving the weather resistance and stability of the overall coating.

[0077] Good UV shielding performance: Photonic crystal coating has a natural blocking effect on ultraviolet light, with a UV transmittance of less than 10%, which can effectively protect the underlying coating and substrate and reduce the damage of ultraviolet rays to the coating.

[0078] The application fields of the technology of the present invention are as follows:

[0079] Architectural decoration: used for coating building exterior walls, interior walls and decorative components, enhancing color expression while providing anti-UV and weathering protection, adapting to various complex outdoor and indoor environment requirements.

[0080] Automotive coating: It can be used for coatings on exterior parts such as car bodies and bumpers, providing a long-lasting bright yellow visual effect while protecting the coating from UV rays and oxidation, extending the service life of the paint.

[0081] Home protection and decoration: It is used for coating furniture, home appliance shells and other items, which not only improves the appearance of the product, but also provides wear resistance, corrosion resistance and anti-aging properties, extending the service life of the product.

[0082] Industrial and consumer electronics fields: used for coating mechanical equipment and consumer electronic housings, providing a bright yellow appearance and environmental protection functions to meet specific industrial and consumer needs.

[0083] Landmark facilities and warning devices: used in scenes where bright yellow warning effects are required, such as traffic signs, warning barriers, and guardrails, to enhance visual recognition and extend service life.

[0084] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing yellow paint by using photonic crystals to improve its brightness and durability, characterized in that: The steps include: S1, preparing benzidine yellow slurry; S2, adding benzidine yellow slurry to the polyester resin coating according to the mass ratio to prepare a bright yellow coating as a base layer; the addition ratio of benzidine yellow slurry is 0.5-2.0% of the polyester resin coating; S3. Prepare a photonic crystal precursor solution of ZnS and SiO2 nanoparticles, and apply it on the surface of the bright yellow coating. After self-heating and self-assembly, a photonic crystal coating is obtained as the surface layer, thereby forming a composite coating.

2. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 1, characterized in that: The S1 step is specifically as follows, calculated by mass ratio: 0.5-2% of dispersant, 10-20% of solvent and 0-2% of defoamer are added to 30-60% of resin, and the mixture is uniformly stirred at low speed. 20-50% of color powder is slowly added to the mixture under low speed stirring, and the color powder is benzidine yellow, and the mixture is dispersed by ultrasound, sand milling or ball milling.

3. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 2, characterized in that: The resin is one or more combinations of polyurethane resin, acrylic resin, epoxy resin, phenolic resin, and polyester resin; the defoaming agent is one or more combinations of methyl silicone oil, ether ester compounds, modified mineral oil, polyoxyethyl glycerol ether, small molecule metal organic matter, and modified silicone polymer; the benzidine yellow has a temperature resistance of 180-200°C, a light resistance of 5, an acid resistance of 5, an alkali resistance of 5, and an oil absorption of ≤45.

4. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 1, characterized in that: The polyester resin coating is prepared by the following steps, calculated by mass percentage: Add 20-50% titanium dioxide, 2-10% amino resin, 0.1-1% closed acid catalyst, 0.1-1% leveling agent, 0.1-1% dispersant and 5-20% solvent to 20-60% polyester resin, stir evenly at low speed, then disperse at high speed, the speed is 2000-3000r / min, and the time is 10-30min.

5. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 4, characterized in that: The polyester resin is a polyester prepolymer, with an acid value of 3-5 KOHmg / g, an OH value of 9-12 KOHmg / g, and a density of 1.20-1.35 g / cm at 30°C. 3 ; The titanium dioxide particle size is 200-300nm, the oil absorption is ≤23g / 100g, and the effective ingredient is ≥97%; the amino resin is a methyl etherified melamine resin, with a viscosity of 600-1200cps and a solid content of 78-82%; the blocked acid catalyst is a sulfonic acid catalyst; the leveling agent is one or more combinations of ethylene glycol butyl ether, cellulose acetate, polyacrylates, silicone oil or silicone compounds.

6. The method for preparing a yellow paint by aiding photonic crystals to improve the brightness and durability of the yellow paint according to claim 2 or claim 4, characterized in that: The dispersant is one or more combinations of dodecyl sulfate, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, and polyvinyl pyrrolidone; the solvent is one or more combinations of ethylene glycol butyl ether, propylene glycol methyl ether acetate, and 3-ethoxyethyl propionate.

7. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 1, characterized in that: In the step S3, the photonic crystal precursor solution is prepared as follows, in terms of mass percentage: ZnS and SiO2 nanoparticles are added to a solvent in a predetermined mass ratio, and the solution is treated using an ultrasonic dispersion device to ensure uniform dispersion of the nanoparticles and avoid particle agglomeration, and the temperature is controlled between room temperature and 50°C.

8. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 7, characterized in that: The particle size of the ZnS is 20-100nm, and the particle size of SiO2 is 30-150nm; the solvent is water or an alcohol solvent; the mass ratio of the ZnS and SiO2 is 1:1 to 1:2, and the concentration range of the precursor solution is 10-30g / L.

9. The preparation method of photonic crystal-assisted yellow paint for improving brightness and durability according to claim 1, characterized in that: The coating thickness of the bright yellow coating is 5-15 μm, and the curing conditions are 160-190° C., 5-15 min; the coating thickness of the photonic crystal precursor solution is 5-20 μm; the temperature of the heated self-assembly is 80-150° C., and the heating time is 1-3 hours.

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