A photoluminescent coating with improved dispersibility and weather resistance

Abstract

The application discloses a photoluminescence coating with improved dispersibility and weather resistance, and relates to the field of coatings.The application solves the technical problems that barium sulfate is prone to agglomeration in the current coating, and photoluminescence coating is attenuated, and solves the problem of powder agglomeration and sedimentation by modifying barium sulfate with organic zirconium phosphate and epoxy soybean oil.The application adopts a core-shell coating technology to break through the bottleneck of the fluorescent lifetime of the coating.The coating prepared by the application has obvious refrigeration, and under the condition that the environmental temperature is 30 DEG C, the surface temperature of the coating is at least 6.7 DEG C lower than the air temperature.Meanwhile, the effective solar reflectivity of the coating is greatly improved.In general, the coating has high dispersibility and strong weather resistance.The application is used for preparing the photoluminescence coating.

Description

Technical Field

[0001] This invention belongs to the field of coatings, specifically relating to a photoluminescent coating that improves dispersibility and weather resistance. Background Technology

[0002] Coatings are widely used in the construction industry, but there are currently technical bottlenecks in their application: First, conventional reflective coatings have low solar reflectivity, making it difficult to achieve effective cooling and resulting in insufficient cooling efficiency; second, traditional luminescent pigments are prone to decay and have poor compatibility with the coating matrix, affecting the coating's luminescent performance; in addition, barium sulfate has excellent refractive index and strong chemical inertness, making it a rational reactive filler, but the hydroxyl groups on the surface of unmodified barium sulfate give it hydrophilic and oleophobic properties, making it prone to agglomeration and sedimentation in organic systems. Traditional coupling agent modification (such as silanes and titanates) can only temporarily improve dispersibility, and hard precipitation still occurs after storage, with obvious stratification, resulting in uneven thermal conductivity distribution of the coating and weak organic-inorganic interface bonding, leading to coating cracking after thermal cycling.

[0003] In addition, the fluorescence lifetime of the coating is also a key concern. Currently, commercially available coatings with fluorescent properties have a low fluorescence intensity retention rate under long-term ultraviolet radiation, often requiring periodic repainting to maintain the fluorescence retention rate, resulting in a large amount of repetitive post-maintenance work. Summary of the Invention

[0004] This invention addresses the technical problems of barium sulfate's tendency to agglomerate and the degradation of photoluminescent coatings in current coatings, providing a photoluminescent coating with improved dispersibility and weather resistance. This invention solves the problem of powder agglomeration and sedimentation by modifying barium sulfate with organozirconium phosphate and epoxidized soybean oil. Furthermore, it employs core-shell coating technology to overcome the bottleneck of coating fluorescence lifetime.

[0005] This invention discloses a photoluminescent coating with improved dispersibility and weather resistance. The coating comprises a white primer and a light green topcoat. The white primer is composed of styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, and primer additives. The light green topcoat is composed of emulsion, modified barium sulfate powder, core-shell luminescent pigment, benzotriazole, water, and topcoat additives. The modified barium sulfate powder is prepared by in-situ coating reaction, and the core-shell luminescent pigment is prepared by sol-gel method coating ytterbium-doped strontium aluminate.

[0006] The modified barium sulfate is prepared according to the following steps:

[0007] 1. Pretreatment of barium sulfate powder using a coupling agent;

[0008] 2. Mix organozirconium phosphate with epoxidized soybean oil to prepare a hybrid solution;

[0009] 3. Add the barium sulfate powder pretreated in step 1 to the hybrid solution prepared in step 2, add triethylamine, and react under vacuum conditions at a temperature of 120~125℃. Then filter, dry, and pulverize to obtain modified barium sulfate powder.

[0010] The preparation method of the core-shell luminescent pigment is as follows:

[0011] Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a mass concentration of 10%, and sonicated for 30 min. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2 and the pH of the ammonia was 9.5. The mixture was stirred at 50 °C for 6 h, centrifuged, washed, dried at 80 °C, and sieved.

[0012] Beneficial effects of this invention:

[0013] This invention modifies barium sulfate using organozirconium phosphate (OZrP) and epoxidized soybean oil. Both OZrP (derived from zirconium phosphate / methylamine) and ESO (soybean oil derivative) are bio-based materials, which improve dispersibility while reducing carbon footprint. During the modification process, organozirconium phosphate provides rigid support and ionic bonding through its layered structure, preventing powder agglomeration. The epoxy groups of epoxidized soybean oil undergo ring-opening reactions with the hydroxyl groups on the surface of barium sulfate, forming strong covalent bonds, inhibiting stratification, and improving the storage stability of the coating. Simultaneously, the silica protective layer formed by strontium aluminate doped with ytterbium in the core-shell luminescent pigment can block direct ultraviolet light irradiation and reduce oxidation. The addition of the ultraviolet absorber benzotriazole has an auxiliary effect in protecting the luminescent centers.

[0014] This invention improves the storage stability of the coating through modification, solving the problems of coating layering and agglomeration, improving dispersibility, achieving an oleophilic effect, and further avoiding sedimentation. The coating prepared by this invention exhibits significant cooling; at an ambient temperature of 30°C, the coating surface temperature is at least 6.7°C lower than the air temperature. Simultaneously, the coating of this invention significantly improves the effective solar reflectivity. Overall, the coating of this invention possesses high dispersibility and strong weather resistance.

[0015] This invention is used to prepare photoluminescent coatings. Detailed Implementation

[0016] Specific Implementation Method 1: This implementation method provides a photoluminescent coating with improved dispersibility and weather resistance. The coating comprises a white primer and a light green topcoat. The white primer is composed of styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, and primer additives. The light green topcoat is composed of emulsion, modified barium sulfate powder, core-shell luminescent pigment, benzotriazole, water, and topcoat additives. The modified barium sulfate powder is prepared by in-situ coating reaction, and the core-shell luminescent pigment is prepared by sol-gel method coating ytterbium-doped strontium aluminate. The preparation method of the modified barium sulfate is carried out according to the following steps:

[0017] 1. Pretreatment of barium sulfate powder using a coupling agent;

[0018] 2. Mix organozirconium phosphate with epoxidized soybean oil to prepare a hybrid solution;

[0019] 3. Add the barium sulfate powder pretreated in step 1 to the hybrid solution prepared in step 2, add triethylamine, and react under vacuum conditions at a temperature of 120~130℃. Then filter, dry, and pulverize to obtain modified barium sulfate powder.

[0020] The preparation method of the core-shell luminescent pigment is as follows:

[0021] Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a mass concentration of 10-15%. The mixture was sonicated for 20-30 minutes. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2-3. The pH of the ammonia was 9-10. The mixture was stirred at 45-55℃ for 4-8 hours, centrifuged, washed, dried, and sieved.

[0022] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the temperature in step three is 120~125℃. Everything else is the same as in Specific Implementation Method One.

[0023] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the mass ratio of organozirconium phosphate to epoxidized soybean oil is 10:(20~22). Everything else is the same as in Specific Implementation Method One or Two.

[0024] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the preparation method of the core-shell luminescent pigment is as follows:

[0025] Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a concentration of 10% by mass. The mixture was sonicated for 30 minutes. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2. The pH of the ammonia was 9.5. The mixture was stirred at 50°C for 6 hours, centrifuged, washed, dried at 80°C, and sieved. Other procedures were the same as in any of the specific embodiments one to three.

[0026] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the white primer contains, by mass, 40-45 parts of styrene-acrylic emulsion, 27-33 parts of titanium dioxide, 7-10 parts of modified barium sulfate powder, 6-8 parts of far-infrared ceramic powder, 10-30 parts of water, and 2-5 parts of additives. Everything else is the same as in Specific Implementation Methods One to Four.

[0027] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that: in the light green topcoat, the components by mass percentage are: emulsion 40-50 parts, modified barium sulfate powder 8-10 parts, core-shell luminescent pigment 8-10 parts, water 20-30 parts, additives 2-5 parts, and benzotriazole 0.5-1 part. Everything else is the same as in Specific Implementation Methods One to Five.

[0028] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that the topcoat additive is composed of a dispersant, a wetting agent, a defoamer, a film-forming aid, and a thickening and leveling agent. The mass ratio of dispersant to wetting agent is 1:1, the mass ratio of dispersant to defoamer is 1:1, the mass ratio of dispersant to thickening and leveling agent is 1:1, and the mass ratio of dispersant to film-forming aid is 1:1. Everything else is the same as in Specific Implementation Methods One to Six.

[0029] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the primer additive is composed of a dispersant, a wetting agent, a defoamer, a film-forming aid, and a thickening and leveling agent, and by mass parts, the dispersant is 0.4 parts, the wetting agent is 0.4 parts, the defoamer is 0.4 parts, the thickening and leveling agent is 0.4 parts, and the film-forming aid is 0.4 parts. Everything else is the same as in Specific Implementation Methods One to Seven.

[0030] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that the emulsion is a styrene-acrylic emulsion, a pure acrylic emulsion, or a silicone-acrylic emulsion. Everything else is the same as in Specific Implementation Methods One to Eight.

[0031] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One to Nine in that the thickness of the white primer is ≥250μm, and the thickness of the light green topcoat is 50μm to 100μm. Everything else is the same as in Specific Implementation Methods One to Nine.

[0032] The scope of this invention is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the invention.

[0033] Example 1:

[0034] This embodiment describes a photoluminescent coating with improved dispersibility and weather resistance, consisting of a white primer and a light green topcoat. The thickness of the white primer is 250 μm, and the thickness of the light green topcoat is 50 μm.

[0035] The white primer is composed of styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, and primer additives. Specifically, the white primer contains 44g of styrene-acrylic emulsion, 30g of titanium dioxide, 8g of modified barium sulfate powder, 6g of far-infrared ceramic powder, 10g of water, and 2g of primer additives. The additives consist of dispersant, wetting agent, defoamer, film-forming aid, and thickening and leveling agent, with each additive containing 0.4g of dispersant, 0.4g of wetting agent, 0.4g of defoamer, 0.4g of thickening and leveling agent, and 0.4g of film-forming aid.

[0036] The modified barium sulfate is prepared as follows:

[0037] 1. Add 100g of barium sulfate powder to 200mL of ethanol solution (the volume ratio of anhydrous ethanol to deionized water is 1:1), then add KH-550 coupling agent, control the temperature at 60℃, stir at 1500 rpm for 2h, filter, and dry at 80℃ for 12h to obtain pretreated barium sulfate powder.

[0038] 2. Disperse 10g of organozirconium phosphate in 100mL of deionized water and sonicate for 30min at a power of 300W. Then add 20g of epoxidized soybean oil and shear disperse at 2000rpm at 80℃ for 1h to form a uniform milky white hybrid liquid.

[0039] 3. Add the barium sulfate powder pretreated in step 1 to the hybrid solution prepared in step 2, add 0.5g of triethylamine, and react for 3h under vacuum conditions, controlling the temperature at 120℃ and the vacuum degree at -0.08MPa. Then filter, vacuum dry at 60℃ for 24h, and pulverize through a 600-mesh sieve to obtain modified barium sulfate powder.

[0040] The white primer is prepared as follows:

[0041] 1. Weigh out styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, and additives. The white primer contains 44g of styrene-acrylic emulsion, 30g of titanium dioxide, 8g of modified barium sulfate powder, 6g of far-infrared ceramic powder, 10g of water, and 2g of primer additives. The primer additives consist of a dispersant, wetting agent, defoamer, film-forming aid, and thickening and leveling agent, with each additive comprising 0.4g of dispersant, 0.4g of wetting agent, 0.4g of defoamer, 0.4g of thickening and leveling agent, and 0.4g of film-forming aid. Divide the thickening and leveling agent into two equal portions.

[0042] 2. Take one portion of the styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, dispersant, wetting agent, defoamer, and thickening and leveling agent weighed in step 1 and put them into a dispersion tank. Stir at high speed (stirring speed is 2000 r / min) in the dispersion tank for 30 min to obtain a well dispersed mixture. Then, press the well dispersed mixture into a grinding tank under vacuum and grind for 60 min to obtain a ground mixture.

[0043] 3. Add the film-forming aid and another part of thickening and leveling agent weighed in step 1 to the grinding mixture obtained in step 2. After dispersing evenly, press it into the paint mixing tank by vacuum to obtain white primer.

[0044] The light green topcoat is composed of an emulsion, modified barium sulfate powder, core-shell luminescent pigment, benzotriazole, water, and topcoat additives. The light green topcoat contains 45g of emulsion, 10g of modified barium sulfate powder, 10g of core-shell luminescent pigment, 25g of water, 5g of topcoat additives, and 5g of benzotriazole. The topcoat additives consist of a dispersant, wetting agent, defoamer, film-forming aid, and thickening and leveling agent. The mass ratio of dispersant to wetting agent is 1:1, the mass ratio of dispersant to defoamer is 1:1, the mass ratio of dispersant to thickening and leveling agent is 1:1, and the mass ratio of dispersant to film-forming aid is 1:1. The emulsion is a styrene-acrylic emulsion. The core-shell luminescent pigment is prepared by coating ytterbium-doped strontium aluminate using a sol-gel method.

[0045] The preparation method of the core-shell luminescent pigment is as follows:

[0046] Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a mass concentration of 10%, and sonicated for 30 min. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2. The pH of the ammonia was 9.5. The mixture was stirred at 50 °C for 6 h, washed three times by centrifugation with deionized water, dried at 80 °C, and sieved to obtain a particle size of 5 μm.

[0047] The light green topcoat is prepared as follows:

[0048] 1. Weigh out styrene-acrylic emulsion, modified barium sulfate powder, core-shell luminescent pigment, benzotriazole, water, and paint additives. The light green topcoat contains 45g of styrene-acrylic emulsion, 10g of modified barium sulfate powder, 10g of core-shell luminescent pigment, 25g of water, 5g of additives, and 5g of benzotriazole. The paint additives consist of dispersant, wetting agent, defoamer, film-forming aid, and thickening and leveling agent, with the mass ratio of dispersant to wetting agent being 1:1, the mass ratio of dispersant to defoamer being 1:1, the mass ratio of dispersant to thickening and leveling agent being 1:1, and the mass ratio of dispersant to film-forming aid being 1:1. Divide the thickening and leveling agent into two equal portions.

[0049] 2. Take one portion of the styrene-acrylic emulsion, talc, core-shell luminescent pigment, water, benzotriazole, dispersant, wetting agent, defoamer, and thickening and leveling agent weighed in step 1 and put them into a dispersion tank. Disperse the mixture in the dispersion tank at high speed (stirring speed is 2000 r / min) for 30 min to obtain a well dispersed mixture. Let it mature for 24 h, and then press it into a grinding tank under vacuum and grind it for 60 min to obtain a ground mixture.

[0050] 3. Add the film-forming aid and another part of thickening and leveling agent weighed in step 1 to the grinding mixture obtained in step 2. After dispersing evenly, press it into the paint mixing tank by vacuum to obtain a light green topcoat.

[0051] Improved dispersion and stability

[0052] Modified barium sulfate, through pretreatment with KH-550 coupling agent and coating with organozirconium phosphate / epoxidized soybean oil hybrid liquid, solves the problem of barium sulfate's easy agglomeration, transforming it from hydrophilic to hydrophobic, and significantly improving its dispersibility and flowability.

[0053] In this embodiment, the epoxy groups in the epoxidized soybean oil form covalent bonds with the surface of barium sulfate, completely inhibiting delamination. The modification process makes the coating free from precipitation and delamination, with excellent storage stability, whiteness of over 97%, and improved adhesion, impact resistance, and salt spray resistance, preventing coating peeling and corrosion.

[0054] Comparative Example 1

[0055] The difference between this comparative example and Example 1 is as follows: Preparation of modified barium sulfate powder: 100g of barium sulfate powder was added to 200mL of ethanol solution (anhydrous ethanol to deionized water volume ratio 1:1), then KH-550 coupling agent was added. The temperature was controlled at 60℃, and the stirring speed was 1500 rpm for 2 hours. After filtration, the mixture was dried at 80℃ for 12 hours to obtain modified barium sulfate powder. Everything else was the same as in Example 1.

[0056] Comparative Example 2

[0057] The difference between this comparative example and Example 1 is that:

[0058] The difference between this comparative example and Example 1 is that the light green topcoat is composed of emulsion, modified barium sulfate powder, commercially available luminescent pigment, water, and topcoat additives.

[0059] The light green topcoat is prepared as follows:

[0060] 1. Weigh out styrene-acrylic emulsion, modified barium sulfate powder, commercially available luminescent pigment, water, and paint additives. The light green topcoat contains 45% styrene-acrylic emulsion, 10% modified barium sulfate powder, 15% commercially available luminescent pigment, 25% water, and 5% additives. The paint additives consist of dispersant, wetting agent, defoamer, film-forming aid, and thickening and leveling agent, with the mass ratio of dispersant to wetting agent being 1:1, the mass ratio of dispersant to defoamer being 1:1, the mass ratio of dispersant to thickening and leveling agent being 1:1, and the mass ratio of dispersant to film-forming aid being 1:1. Divide the thickening and leveling agent into two equal parts.

[0061] 2. Take one portion of the styrene-acrylic emulsion, talc, commercially available luminescent pigment, water, dispersant, wetting agent, defoamer and thickening and leveling agent weighed in step one and put them into a dispersion tank. Disperse the mixture in the dispersion tank at high speed (stirring speed is 2000r / min) for 30min to obtain a well dispersed mixture. Let it mature for 24h, and then press it into a grinding tank under vacuum and grind it for 60min to obtain a ground mixture.

[0062] 3. Add the film-forming aid and another part of thickening and leveling agent weighed in step 1 to the grinding mixture obtained in step 2. After dispersing evenly, press it into the paint mixing tank by vacuum to obtain a light green topcoat.

[0063] Everything else is the same as in Example 1.

[0064] Experimental Results and Data Analysis:

[0065] The experimental test was conducted using a roller coating method, with a primer thickness of 250 μm and a topcoat thickness of 50 μm.

[0066] Fluorescence retention rate was tested using ISO 4892-2, with xenon lamp aging (0~2000h) and fluorescence spectrometry (λ_ex=365nm).

[0067] Weather resistance was tested according to ASTM G154, with QUV accelerated aging (60℃ / UVB), color difference ΔE measured (CIE Lab), and chalking grade assessed (ASTM D4214).

[0068] Using an aluminized film substrate, a thermocouple was used to record the temperature curve from 10:00 to 14:00, and the cooling temperature difference ΔT was detected.

[0069] The coating was applied to an aluminized film and placed under a sunlight simulator, with the ambient temperature maintained at 30°C. The average temperature difference between the coating surface and the ambient temperature, ΔT (°C), was recorded for 4 hours.

[0070] Glycerin was used as the test solution to test the oleophilicity of the coating:

[0071]

[0072] Storage stability test: Store the coating in an accelerated aging chamber at 50°C for 30 days; calculate the sedimentation rate = (height of sedimentation layer / total height) × 100%; conduct a dispersibility rating: level 0 (no sedimentation) to level 5 (hard sedimentation).

[0073]

[0074] Solar reflectance and spectral reflectance testing of white primer:

[0075] The white primer prepared in Example 1 was applied to an aluminum-coated film with an area of ​​5m×5m by roller coating. The thickness of the white primer was 250μm. The test results are shown in the table.

[0076]

[0077] Effective solar reflectance measurement:

[0078] The white primer prepared in Example 1, with a thickness of 250 μm, was applied to a 5 m × 5 m aluminized film using a roller coating method. The light green cooling coating prepared in Example 1, which exhibits a temperature lower than the ambient temperature under direct sunlight, was also applied to the same 5 m × 5 m aluminized film using a roller coating method, with a thickness of 250 μm for the white primer and 50 μm for the light green topcoat. The film was then placed under direct sunlight. Following the method described in ASTM E1918-16 (Standard Test Method for Measuring Solar Reflectance of Horizontal and Low-Sloped Surfaces in the Field), the solar reflectance of the white primer prepared in Example 1 and the effective solar reflectance of the light green cooling coating prepared in Example 1, which exhibits a temperature lower than the ambient temperature under direct sunlight, were measured using two portable light meters and denoted as SR and ESR, respectively. ESR-SR is generally defined as the fluorescent cooling process. Outdoor test results showed that the ESR-SR was 0.058. Since outdoor solar reflectance measurements determine the reflectance of scattered solar light, while spectrophotometer measurements measure the reflectance of perpendicularly incident solar light, the outdoor solar reflectance is typically 0.08 lower than the spectrophotometer-measured solar reflectance. Furthermore, the solar reflectance of perpendicularly incident light is generally used in heat balance formulas or formulas for calculating cooling power, and the solar reflectance of fluorescent materials cannot be directly measured using a spectrophotometer because fluorescent materials emit light in the excited state, interfering with the light source. Therefore, using this indirect method, the effective solar reflectance of the coating prepared in Example 1 was determined to be 0.898.

Claims

1. A photoluminescent coating with improved dispersibility and weather resistance, characterized in that... The coating comprises a white primer and a light green topcoat. The white primer is composed of styrene-acrylic emulsion, titanium dioxide, modified barium sulfate powder, far-infrared ceramic powder, water, and primer additives. The light green topcoat is composed of an emulsion, modified barium sulfate powder, core-shell luminescent pigment, benzotriazole, water, and topcoat additives. The modified barium sulfate powder is prepared by an in-situ coating reaction, and the core-shell luminescent pigment is prepared by coating ytterbium-doped strontium aluminate using a sol-gel method. The preparation method of the modified barium sulfate is carried out according to the following steps:

1. Pretreatment of barium sulfate powder using a coupling agent; 2. Mix organozirconium phosphate with epoxidized soybean oil to prepare a hybrid solution; 3. Add the barium sulfate powder pretreated in step 1 to the hybrid solution prepared in step 2, add triethylamine, and react under vacuum conditions at a temperature of 120~130℃. Then filter, dry, and pulverize to obtain modified barium sulfate powder. The preparation method of the core-shell luminescent pigment is as follows: Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a mass concentration of 10-15%. The mixture was sonicated for 20-30 minutes. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2-3. The pH of the ammonia was 9-10. The mixture was stirred at 45-55℃ for 4-8 hours, centrifuged, washed, dried, and sieved.

2. The photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The temperature described in step three is 120~125℃.

3. The photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The mass ratio of organozirconium phosphate to epoxidized soybean oil is 10:(20~22).

4. The photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The preparation method of the core-shell luminescent pigment is as follows: Ytterbium-doped strontium aluminate was dispersed in anhydrous ethanol at a mass concentration of 10%, and sonicated for 30 min. Then, tetraethyl orthosilicate and ammonia were added, with a mass ratio of tetraethyl orthosilicate to strontium aluminate of 1:2 and the pH of the ammonia was 9.

5. The mixture was stirred at 50 °C for 6 h, centrifuged, washed, dried at 80 °C, and sieved.

5. A photoluminescent coating with improved dispersibility and weather resistance according to any one of claims 1 to 4, characterized in that... The white primer consists of the following components by mass: 40-45 parts styrene-acrylic emulsion, 27-33 parts titanium dioxide, 7-10 parts modified barium sulfate powder, 6-8 parts far-infrared ceramic powder, 10-30 parts water, and 2-5 parts additives.

6. A photoluminescent coating with improved dispersibility and weather resistance according to any one of claims 1 to 4, characterized in that... The light green topcoat consists of the following components by mass: emulsion 40-50 parts, modified barium sulfate powder 8-10 parts, core-shell luminescent pigment 8-10 parts, water 20-30 parts, additives 2-5 parts, and benzotriazole 0.5-1 parts.

7. A photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The topcoat additives consist of dispersants, wetting agents, defoamers, film-forming aids, and thickening and leveling agents, with the mass ratio of dispersant to wetting agent being 1:1, the mass ratio of dispersant to defoamer being 1:1, the mass ratio of dispersant to thickening and leveling agent being 1:1, and the mass ratio of dispersant to film-forming aid being 1:

1.

8. The photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The primer additive is composed of a dispersant, a wetting agent, a defoamer, a film-forming aid, and a thickening and leveling agent, wherein the dispersant, wetting agent, defoamer, thickening and leveling agent, and film-forming aid are each contained in parts by weight of 0.4 parts.

9. A photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The emulsion is a styrene-acrylic emulsion, a pure acrylic emulsion, or a silicone-acrylic emulsion.

10. A photoluminescent coating with improved dispersibility and weather resistance according to claim 1, characterized in that... The thickness of the white primer is ≥250μm, and the thickness of the light green topcoat is 50μm ~100μm.

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