Long-acting light-storing and light-emitting coating, preparation method and application

Abstract

The invention relates to the field of functional coatings for traffic facilities, in particular to a long-acting light-storing and light-emitting coating as well as a preparation method and application thereof. According to the long-acting light-storing and light-emitting coating provided by the invention, the light-storing and light-emitting coating adopts the function collaborative design of the light-storing bottom coating, the light-emitting enhancing middle coating and the anti-fouling and weather-proof transparent surface coating, and has the advantages of efficient light absorption, long-acting light emitting, anti-fouling and anti-aging. The two light-storing and light-emitting materials AH-805W and AH-812W in the coating are compounded, and when excitation is stopped for 10 min, the luminance is larger than or equal to 300 mcd / m < 2 >. Due to the particle size gradient distribution design of the floating coating, the light storage and luminous efficiency is effectively improved, and the problem of insufficient afterglow brightness of a single-layer coating is solved. And the transparent finishing coat layer adopts an organic silicon methyl trimethoxy silane antifouling technology, so that the self-cleaning capability of the coating is remarkably improved, and the coating is suitable for an outdoor traffic environment. The long-acting light-storing and light-emitting coating can store light in the daytime and does not need power supply at night, and 40%-50% of the illumination energy-saving effect of traffic facilities is achieved.

Description

Technical Field

[0001] This invention relates to the field of functional coatings for transportation facilities, specifically to a long-lasting phosphorescent coating, its preparation method, and its application. Background Technology

[0002] Existing traffic lighting systems generally rely on electricity, resulting in high energy consumption and maintenance costs. Meanwhile, traditional fluorescent or photoluminescent coatings typically suffer from short afterglow time, insufficient brightness, and poor weather resistance, making them unsuitable for long-term lighting and complex outdoor environments. Furthermore, the coating surface has poor resistance to contamination, easily accumulating dust, which affects its luminous performance and lifespan.

[0003] This patent points out that using aluminate-based rare-earth luminescent materials can significantly improve afterglow brightness and duration, but single-material and single-layer coating structures cannot simultaneously achieve high brightness, long-lasting luminescence, and weather resistance and anti-fouling performance. Therefore, there is an urgent need for a multifunctional, synergistic, long-lasting, and stable luminescent coating system to improve the nighttime visibility and energy-saving safety of traffic facilities. Summary of the Invention

[0004] The purpose of this invention is to provide a long-lasting phosphorescent coating, its preparation method, and its application. The long-lasting phosphorescent coating has a long-lasting luminescent function and is particularly suitable for auxiliary lighting and safety indication applications in low-light or nighttime environments such as tunnels, underground passages, traffic signs, and guardrails.

[0005] To address the aforementioned technical problems, the present invention proposes the following technical solution: The present invention provides a long-lasting phosphorescent coating, comprising: a phosphorescent base layer, a luminescence-enhancing intermediate layer, and a transparent top layer; the upper surface of the phosphorescent base layer is provided with the luminescence-enhancing intermediate layer, and the upper surface of the luminescence-enhancing intermediate layer is provided with the transparent top layer; The phosphorescent base coating uses acrylic emulsion as a base material and also adds titanium dioxide, AH-805W phosphorescent luminescent material, sodium polycarboxylate dispersant and metal soap defoamer; the function of the phosphorescent base coating is to provide high reflectivity and basic phosphorescence at the bottom layer, and improve the adhesion of the overall system by ≥1 MPa.

[0006] The luminescence-enhancing intermediate coating uses modified acrylic emulsion as a base material and also adds AH-805W type phosphorescent luminescent material, AH-812W phosphorescent luminescent material, sodium polycarboxylate dispersant and anti-settling agent; the intermediate coating is the main luminescent layer, which fully releases afterglow brightness and decays slowly, ensuring that the auxiliary lighting at night lasts for more than 12 hours.

[0007] The transparent topcoat uses a dual-emulsion composite system of styrene-acrylic emulsion and pure acrylic emulsion as its base material, and also adds nano-SiO2 and organosilicon. The function of the topcoat is to prevent surface contamination and aging, maintain high transparency over a long period, and protect the stability of the light-emitting layer. The light transmittance of the topcoat is ≥88%.

[0008] Preferably, the thickness of the phosphorescent base coating is 120-200μm, more preferably 150μm, the thickness of the luminescence-enhancing intermediate coating is 200-600μm, more preferably 250-500μm, and the thickness of the transparent top coating is 80-150μm, more preferably 100μm.

[0009] Preferably, the preparation method of the AH-805W type photoluminescent material includes: mixing strontium carbonate, aluminum oxide, europium oxide, dysprosium oxide and boric acid, and then sequentially grinding, drying, calcining, grinding again and sintering to obtain the AH-805W type photoluminescent material.

[0010] Preferably, the mass ratio of strontium carbonate, aluminum oxide, europium oxide and dysprosium oxide is 0.95-1.0:0.9-1.1:0.009-0.011:0.019-0.021, more preferably 0.97:1.0:0.01:0.02.

[0011] Preferably, the mass of boric acid accounts for 1%-2% of the total mass of strontium carbonate, aluminum oxide, europium oxide and dysprosium oxide, more preferably 1.5%.

[0012] Preferably, the grinding method includes ball milling, and the ball milling time is 5-7 hours, more preferably 6 hours.

[0013] Preferably, the drying temperature is 110-130°C, more preferably 120°C. The drying continues until the mass is constant.

[0014] Preferably, the calcination temperature is 890-910℃, more preferably 900℃. The calcination time is 1.4-1.6h, more preferably 1.5h.

[0015] Preferably, the sintering temperature is 1390-1450℃, more preferably 1400℃. The sintering time is 3.8-4.2h, more preferably 4h.

[0016] Preferably, the preparation method of the AH-812W photoluminescent material includes: mixing strontium carbonate, magnesium oxide, silicon dioxide, europium oxide, dysprosium oxide and boric acid, and then sequentially grinding, drying, pre-calcining, grinding again and sintering to obtain the AH-812W photoluminescent material.

[0017] Preferably, the mass ratio of strontium carbonate, magnesium oxide, silicon dioxide, europium oxide, and dysprosium oxide is 1.95-2.0:0.9-1.1:1.9-2.1:0.009-0.011:0.019-0.021, and more preferably 1.97:1.0:2.0:0.01:0.02.

[0018] Preferably, the boric acid accounts for 1.9%-2.5% of the total mass of strontium carbonate, magnesium oxide, silicon dioxide, europium oxide, and dysprosium oxide, more preferably 2%.

[0019] Preferably, the grinding method includes ball milling, and the ball milling time is 7-9 hours, more preferably 8 hours.

[0020] Preferably, the drying temperature is 90-140°C, more preferably 100°C. The drying continues until the mass is constant.

[0021] Preferably, the calcination temperature is 900-1050℃, more preferably 1000℃. The calcination time is 1.5-2.2h, more preferably 2h.

[0022] Preferably, the sintering temperature is 1300-1400℃, more preferably 1350℃. The sintering time is 2.8-4h, more preferably 3h.

[0023] Preferably, the sodium polycarboxylate dispersant includes one or more of sodium polyacrylate, sodium polymethacrylate, sodium acrylic acid-maleic anhydride copolymer, sodium polyether-grafted acrylic acid copolymer, and sodium starch-grafted acrylic acid copolymer.

[0024] Preferably, the metal soap defoamer includes one or more of calcium stearate, magnesium stearate, barium stearate, zinc stearate, aluminum stearate, cadmium stearate, lead stearate, and calcium laurate.

[0025] Preferably, the anti-settling agent comprises hydroxyethyl cellulose.

[0026] Preferably, the solid content of the acrylic emulsion is 45%-55%; the content of titanium dioxide in the phosphorescent base coating is 10wt%-35wt%, the content of AH-805W phosphorescent material is 5wt%-40wt%, the content of sodium polycarboxylate dispersant is 0.1wt%-2wt%, and the content of metal soap defoamer is 0.2wt%-2wt%; the content of titanium dioxide in the phosphorescent base coating is 10wt%-35wt%, or 20wt%-35wt%, more preferably 25wt%.

[0027] Preferably, the total content of AH-805W and AH-812W phosphorescent materials in the luminescence-enhancing intermediate coating is 45wt%-50wt%, and the mass ratio of AH-805W to AH-812W phosphorescent materials is (2-3):2, more preferably 3:2; the mass content of sodium polycarboxylate dispersant in the luminescence-enhancing intermediate coating is 0.4wt%-1.2wt%, more preferably 0.8wt%; and the mass content of anti-settling agent is 0.3wt%-2wt%, more preferably 1wt%.

[0028] Preferably, the content of styrene-acrylic emulsion in the dual-emulsion compound system is 55wt%-65wt%, and the content of pure acrylic emulsion in the dual-emulsion compound system is 35wt%-45wt%.

[0029] Preferably, the content of nano-SiO2 in the transparent coating is 1.5wt%-10wt%, or 1.5wt%-2.5wt%, more preferably 2wt%, and the content of organosilicon methyltrimethoxysilane in the transparent coating is 5wt%-18wt%, more preferably 10wt%-12wt%; the light transmittance of the transparent coating is ≥88%.

[0030] This invention provides a method for preparing the long-lasting phosphorescent coating described in the above technical solution. The method for preparing the phosphorescent base coating includes: dispersing the acrylic emulsion, titanium dioxide, AH-805W phosphorescent material, sodium polycarboxylate dispersant, and metal soap defoamer at high speed, followed by sand milling to obtain the phosphorescent base coating; the high-speed stirring speed is 800-1500 rpm, or 900-1200 rpm, more preferably 1000-1100 rpm.

[0031] The method for preparing the luminescence-enhancing intermediate coating includes: subjecting the modified acrylic emulsion, AH-805W type phosphorescent material, AH-812W phosphorescent material, sodium polycarboxylate dispersant and anti-settling agent to low-speed stirring and grinding to obtain the luminescence-enhancing intermediate coating; the low-speed stirring speed is 500-800 rpm, more preferably 600-700 rpm.

[0032] The method for preparing the transparent surface coating includes: defoaming the dual emulsion compound system, nano-SiO2, and anti-settling agent by high-speed stirring to obtain the transparent surface coating. The high-speed stirring speed is 800-1200 rpm, more preferably 900-1100 rpm.

[0033] This invention provides the application of the long-lasting phosphorescent coating described in the above-described technical solution or the long-lasting phosphorescent coating obtained by the preparation method described in the above-described technical solution in the preparation of functional coatings for transportation facilities.

[0034] Preferably, the traffic facilities include one or more of the following: tunnels, underpasses, traffic signs, and guardrails.

[0035] The beneficial effects of the present invention are as follows: The present invention provides a long-lasting photoluminescent coating, which is a three-layer synergistic design consisting of a photoluminescent base layer, a luminescent enhancement intermediate layer, and a dirt-resistant and weather-resistant transparent top layer. These layers complement each other and have the properties of high-efficiency light absorption, long-lasting luminescence, and dirt-resistant and anti-aging.

[0036] The coating incorporates two photoluminescent materials, AH-805W and AH-812W, which exhibit a dual-wavelength synergistic luminescence effect. After 10 minutes of excitation cessation, the luminescence intensity is ≥300 mcd / m². 2 .

[0037] The intermediate coating features a gradient particle size distribution design, effectively improving light storage and luminescence efficiency and avoiding the insufficient afterglow brightness problem of traditional single-layer coatings. The transparent topcoat layer employs organosilicon methyltrimethoxysilane antifouling technology, significantly enhancing the coating's self-cleaning ability and making it suitable for outdoor traffic environments. The topcoat layer prevents surface contamination and aging, maintains high transparency over the long term, and protects the stability of the luminescent layer.

[0038] The application of the long-lasting photoluminescent coating of the present invention can achieve the technical effect of energy saving. The long-lasting photoluminescent coating of the present invention can store light during the day and does not require additional power supply at night, achieving the technical effect of 40%-50% energy saving in traffic facility lighting.

[0039] The initial luminance of the long-lasting phosphorescent coating of this invention is ≥500 mcd / m 2 Afterglow brightness ≥200mcd / m² for 10 minutes 2 It conforms to DIN67510 standard and has optical properties.

[0040] The long-lasting phosphorescent coating of the present invention has durability.

[0041] The long-lasting phosphorescent coating of this invention has a contact angle >110°, and its light reflectivity remains above 90% after being contaminated, meeting ASTM D4214 standard Class I and exhibiting anti-fouling properties. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the three-layer structure of the long-lasting phosphorescent coating prepared in Example 1. Detailed Implementation

[0043] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but these should not be construed as limiting the scope of protection of the present invention.

[0044] I. Preparation method of AH-805W type photoluminescent material: 1. Raw materials Strontium source: Strontium carbonate (SrCO3), analytical grade.

[0045] Aluminum source: Alumina (Al2O3), analytical grade.

[0046] Activator: Europium oxide (Eu2O3), analytical grade.

[0047] Co-activator: Dysprosium oxide (Dy2O3), analytical grade.

[0048] Flux: Boric acid (H3BO3), used to lower the reaction temperature, promote crystal growth and improve luminescence properties.

[0049] After mixing SrCO3:Al2O3:Eu2O3:Dy2O3 in a mass ratio of 0.97:1.0:0.01:0.02, flux is added. The amount of flux added is 1.5% of the total mass of strontium carbonate (SrCO3), aluminum oxide (Al2O3), europium oxide (Eu2O3), and dysprosium oxide (Dy2O3).

[0050] 2. Preparation method The weighed raw materials strontium carbonate (SrCO3), aluminum oxide (Al2O3), europium oxide (Eu2O3), dysprosium oxide (Dy2O3) and boric acid (H3BO3) were placed in a ball mill jar, and an appropriate amount of deionized water and zirconia balls were added. The mixture was then ball-milled for 6 hours.

[0051] Pour the ball-milled slurry into an evaporating dish, place it in a drying oven, and dry it thoroughly at 120°C to remove deionized water.

[0052] The dried mixed powder was placed in an alumina crucible and then placed in a muffle furnace. It was calcined at 900°C for 1.5 hours in air. The calcination process decomposed SrCO3, initially forming the target crystalline phase and reducing volume shrinkage during final sintering.

[0053] The calcined lumpy material is ground into fine powder again to ensure more thorough contact of the reactants, preparing for the final high-temperature sintering.

[0054] The re-ground powder is compacted and placed into a corundum crucible. After the crucible is placed in a high-temperature furnace, a weak reducing atmosphere is introduced. Usually, inert nitrogen (N2) is used as the main component, mixed with a small amount of reducing hydrogen (H2) with a volume ratio of 5% to obtain a mixed gas. The mixture is then sintered at 1400℃ for 4 hours.

[0055] After sintering, the material is cooled to room temperature in a reducing atmosphere. The hard block obtained by sintering is broken and ground into fine powder of a specific particle size (usually 8μm~40μm, 20μm in this example) using a ball mill to obtain AH-805W type phosphorescent material.

[0056] II. Preparation method of AH-812W photoluminescent material: 1. Raw materials: Strontium source: Strontium carbonate (SrCO3); Magnesium source: Magnesium oxide (MgO); Silicon source: Silicon dioxide (SiO2); Activator: europium oxide (Eu2O3); co-activator: dysprosium oxide (Dy2O3); flux: boric acid (H3BO3); the effective content of dysprosium oxide is 99%, and the remaining substances are all analytical grade.

[0057] 2. Preparation method The mixture of SrCO3, MgO, SiO2, Eu2O3, and Dy2O3 in a mass ratio of 1.97:1.0:2.0:0.01:0.02 was prepared, with the flux added at 2% of the total mass of the five substances. The raw materials were placed in a ball mill jar, along with zirconium oxide balls and an appropriate amount of anhydrous ethanol, and milled for 8 hours to ensure thorough mixing. The milled slurry was then thoroughly dried in a 100°C drying oven to remove the ethanol.

[0058] The dried powder was placed in a crucible and pre-calcined at 1000°C for 2 hours in air. This was to decompose the carbonate and initially form the precursor of the target crystalline phase.

[0059] The pre-calcined and agglomerated material is ground into fine powder again to increase the reaction contact area.

[0060] The powder was placed in a crucible and sintered at 1350℃ for 3 hours in a weakly reducing CO atmosphere to obtain AH-812W phosphorescent material.

[0061] The modified acrylic emulsion was purchased from Shandong Baoda New Materials Co., Ltd.

[0062] Example 1 This invention provides a three-layer composite light-emitting coating system, consisting of a light-emitting base layer, a light-enhancing intermediate layer, and a dirt-resistant and weather-resistant transparent top layer. Each layer complements the other, possessing characteristics such as high-efficiency light absorption, long-lasting light emission, dirt resistance, and anti-aging properties.

[0063] 1. Preparation of phosphorescent primer coating (1) Raw materials for preparing phosphorescent base coating: acrylic emulsion is used as the base material, with a solid content of 45%; titanium dioxide (rutile type) and AH-805W phosphorescent material are used as functional fillers; magnesium stearate, a metal soap defoamer, and sodium polycarboxylate dispersant, sodium polyacrylate are used as the auxiliary agent system.

[0064] (2) Preparation method: Acrylic emulsion, titanium dioxide, AH-805W type phosphorescent luminescent material, magnesium stearate (a metal soap defoamer), and sodium polycarboxylate (a sodium polyacrylate dispersant) were mixed and dispersed at 1200 rpm for 20 min to obtain a mixture. The content of titanium dioxide in the mixture was 35 wt%, the content of AH-805W type phosphorescent luminescent material was 10 wt%, the content of magnesium stearate (a metal soap defoamer) was 1 wt%, and the content of sodium polycarboxylate (a sodium polyacrylate dispersant) was 1 wt%. The mixture was then sand-milled for 60 min to obtain a phosphorescent primer coating. The viscosity of the phosphorescent primer coating was adjusted to a suitable application viscosity of 10 mPa•s. The coating thickness of the phosphorescent primer coating was 150 μm.

[0065] 2. Preparation of intermediate coating (1) Preparation of raw materials: Modified acrylic emulsion is used as the base material, and the pH value of the modified acrylic emulsion is 8.5; the functional components are AH-805W phosphorescent material and AH-812W phosphorescent material, and the mass ratio of AH-805W to AH-812W is 3:2; the particle size D50 of AH-805W is controlled at 25μm, and the particle size D50 of AH-812W is controlled at 30μm to ensure uniform distribution of luminescent particles.

[0066] The additive system consists of sodium polycarboxylate dispersant sodium polyacrylate and anti-settling agent HEC (hydroxyethyl cellulose).

[0067] (2) Preparation method: Modified acrylic emulsion, AH-805W phosphorescent material, AH-812W phosphorescent material, sodium polycarboxylate dispersant sodium polyacrylate, and HEC are mixed and dispersed at 500 rpm for 25 min to obtain a mixture. The total content of AH-805W and AH-812W in the mixture is 45 wt%, and the mass ratio of AH-805W phosphorescent material to AH-812W phosphorescent material is 3:2. The content of sodium polycarboxylate dispersant sodium polyacrylate in the mixture is 0.8 wt%, and the content of HEC is 1.2 wt%. The mixture is then ground evenly, and the particle size after grinding is below 35 μm to obtain a mid-coating layer with a coating thickness of 500 μm.

[0068] 3. Preparation of the topcoat (1) The dual emulsion compound system is used as the base material. The weight ratio of styrene-acrylic emulsion in the compound system is 65wt%, the weight ratio of pure acrylic emulsion is 35wt%, and the functional additives are organosilicon methyltrimethoxysilane (surface energy controlled at 28-30mN / m) and nano SiO2.

[0069] (2) Preparation method: Styrene-acrylic emulsion, pure acrylic emulsion, organosilicon methyltrimethoxysilane and nano SiO2 are mixed and dispersed at 1200 rpm for 20 min to obtain a mixture. The content of nano SiO2 in the mixture is 2 wt%, and the content of organosilicon methyltrimethoxysilane in the mixture is 10 wt%. The mixture is then defoamed under vacuum to obtain a topcoat. The topcoat has a film thickness of 100 μm and is used during construction.

[0070] The light transmittance of the topcoat is 88%.

[0071] The test methods for afterglow brightness, afterglow duration, antifouling performance contact angle, and surface contaminant removal rate are specified in "DIN 67510-1:2009-11 (German Industrial Standard, November 2009 edition)". The results show that after irradiation with 1000 lx for 5 minutes, the photoluminescent coating system achieved a measured afterglow brightness of 256 mcd / m² after 10 minutes. 2 60 mcd / m after 60 minutes 2 Afterglow duration >12h. Antifouling performance test: contact angle >110°, surface contaminant removal rate >95%.

[0072] Example 2 (Application in tunnel railings) (1) Raw materials for preparing phosphorescent base coating: acrylic emulsion is used as the base material, with a solid content of 55%; titanium dioxide (rutile type) and AH-805W phosphorescent material are used as functional fillers; magnesium stearate, a metal soap defoamer, and sodium polycarboxylate dispersant, polymethyl methacrylate are used as the auxiliary agent system.

[0073] (2) Preparation method: Acrylic emulsion, titanium dioxide, AH-805W type phosphorescent luminescent material, magnesium stearate (metal soap defoamer), and sodium polycarboxylate dispersant (sodium polymethacrylate) were mixed and dispersed at 800 rpm for 20 min to obtain a mixture. The content of titanium dioxide in the mixture was 10 wt%, the content of AH-805W type phosphorescent luminescent material was 40 wt%, the content of magnesium stearate (metal soap defoamer) was 0.5 wt%, and the content of sodium polycarboxylate dispersant (sodium polymethacrylate) was 0.4 wt%. The mixture was then sand-milled for 60 min to obtain a phosphorescent primer coating. The viscosity of the phosphorescent primer coating was adjusted to a suitable application viscosity of 10 mPa•s. The coating thickness of the phosphorescent primer coating was 120 μm.

[0074] The function of the phosphorescent primer layer: to provide high reflectivity and basic phosphorescence at the bottom layer, thereby improving the adhesion of the overall system.

[0075] 2. Preparation of intermediate coating (1) Raw materials: Modified acrylic emulsion was used as the base material, and the pH value of the modified acrylic emulsion was 8.5; the functional components were AH-805W phosphorescent material and AH-812W phosphorescent material, and AH-805W and AH-812W were compounded in a mass ratio of 1:1; the particle size D50 of AH-805W was controlled at 30μm, and the particle size D50 of AH-812W was controlled at 40μm to ensure uniform distribution of luminescent particles. The auxiliary agent system consisted of sodium polycarboxylate dispersant sodium polymethacrylate and anti-settling agent HEC (hydroxyethyl cellulose).

[0076] (2) Preparation method: Modified acrylic emulsion, AH-805W phosphorescent material, AH-812W phosphorescent material, sodium polycarboxylate dispersant sodium polymethacrylate and HEC are mixed and dispersed at 500 rpm for 30 min to obtain a mixture. The total content of AH-805W and AH-812W in the mixture is 50 wt%, the content of sodium polycarboxylate dispersant sodium polymethacrylate in the mixture is 0.4 wt%, and the content of HEC is 0.3 wt%. The mixture is then ground evenly. After grinding, the particle size is below 35 μm to obtain the intermediate coating. The coating thickness of the intermediate coating is 200 μm.

[0077] 3. Preparation of the topcoat (1) A dual-emulsion compound system was used as the base material. The weight ratio of styrene-acrylic emulsion in the compound system was 55 wt%, and the weight ratio of pure acrylic emulsion was 45 wt%. The functional additives were organosilicon methyltrimethoxysilane (surface energy controlled at 28-30 mN / m) and nano-SiO2.

[0078] (2) Preparation method: Styrene-acrylic emulsion, pure acrylic emulsion, organosilicon methyltrimethoxysilane, and nano-SiO2 were mixed and dispersed at 800 rpm for 30 min to obtain a mixture. The content of nano-SiO2 in the mixture was 10 wt%, and the content of organosilicon methyltrimethoxysilane in the mixture was 12 wt%. The mixture was then defoamed under vacuum to obtain a topcoat. The topcoat was used during construction, and its film thickness was 80 μm. The light transmittance of the topcoat was 88%.

[0079] For the test methods of afterglow brightness, afterglow duration, antifouling performance contact angle and surface contaminant removal rate, please refer to "DIN 67510-1:2009-11 (German Industrial Standard, November 2009 edition)".

[0080] It can be seen that the photoluminescent coating systems prepared in Examples 1 and 2, after being irradiated with 1000 lx for 5 min, exhibited a measured afterglow brightness of ≥300 mcd / m² after 10 min. 2 >50 mcd / m after 60 minutes 2 The afterglow lasts for more than 12 hours, the anti-fouling performance test shows a contact angle of more than 100°, and the surface pollutant removal rate reaches more than 85%.

[0081] In summary, the present invention provides a long-lasting photoluminescent coating, which is a three-layer synergistic design consisting of a photoluminescent base layer, a luminescence-enhancing intermediate layer, and a stain-resistant and weather-resistant transparent top layer. These layers complement each other and combine high-efficiency light absorption, long-lasting luminescence, and stain-resistant and anti-aging properties.

[0082] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A long-lasting phosphorescent coating, characterized in that, include: The light-gathering base coating, the light-enhancing intermediate coating, and the transparent top coating are provided; the upper surface of the light-gathering base coating is provided with the light-enhancing intermediate coating, and the upper surface of the light-enhancing intermediate coating is provided with the transparent top coating. The photoluminescent base coating uses acrylic emulsion as a base material and also adds titanium dioxide, AH-805W photoluminescent material, sodium polycarboxylate dispersant and metal soap defoamer; The luminescence-enhancing intermediate coating uses modified acrylic emulsion as a base material and also adds AH-805W type phosphorescent material, AH-812W phosphorescent material, sodium polycarboxylate dispersant and anti-settling agent; The transparent coating uses a dual-emulsion composite system of styrene-acrylic emulsion and pure acrylic emulsion as the base material, and also adds nano-SiO2 and organosilicon.

2. The long-lasting phosphorescent coating according to claim 1, characterized in that, The thickness of the phosphorescent base coating is 120-200 μm, the thickness of the luminescence-enhancing intermediate coating is 200-600 μm, and the thickness of the transparent top coating is 80-150 μm.

3. The long-lasting phosphorescent coating according to claim 1, characterized in that, The preparation method of the AH-805W type photoluminescent material includes: mixing strontium carbonate, aluminum oxide, europium oxide, dysprosium oxide and boric acid, and then grinding, drying, calcining, grinding again and sintering in sequence to obtain the AH-805W type photoluminescent material.

4. The long-lasting phosphorescent coating according to claim 1, characterized in that, The preparation method of the AH-812W photoluminescent material includes: mixing strontium carbonate, magnesium oxide, silicon dioxide, europium oxide, dysprosium oxide and boric acid, and then sequentially grinding, drying, pre-calcining, grinding again and sintering to obtain the AH-812W photoluminescent material.

5. The long-lasting phosphorescent coating according to claim 1, characterized in that, The sodium polycarboxylate dispersant includes one or more of sodium polyacrylate, sodium polymethacrylate, sodium acrylic acid-maleic anhydride copolymer, sodium polyether-grafted acrylic acid copolymer, and sodium starch-grafted acrylic acid copolymer; the organosilicon includes methyltrimethoxysilane.

6. The long-lasting phosphorescent coating according to claim 1, characterized in that, The metal soap defoamer includes one or more of the following: calcium stearate, magnesium stearate, barium stearate, zinc stearate, aluminum stearate, cadmium stearate, lead stearate, and calcium laurate.

7. The long-lasting phosphorescent coating according to claim 1, characterized in that, The anti-settling agent includes hydroxyethyl cellulose.

8. The long-lasting phosphorescent coating according to claim 1, characterized in that, The acrylic emulsion has a solid content of 45%-55%; the phosphorescent base coating contains 10wt%-35wt% titanium dioxide, 5wt%-40wt% AH-805W phosphorescent material, 0.1wt%-2wt% sodium polycarboxylate dispersant, and 0.2wt%-2wt% metal soap defoamer. The total content of AH-805W and AH-812W phosphorescent materials in the luminescence-enhancing intermediate coating is 45wt%-50wt%, and the mass ratio of AH-805W to AH-812W phosphorescent materials is (2-3):2; the content of sodium polycarboxylate dispersant in the luminescence-enhancing intermediate coating is 0.4wt%-1.2wt%, and the content of anti-settling agent is 0.3wt%-1.2wt%. The mass ratio of styrene-acrylic emulsion in the dual-emulsion compound system is 55wt%-65wt%, and the mass ratio of pure acrylic emulsion in the dual-emulsion compound system is 35wt%-45wt%. The transparent coating contains 1.5-10 wt% nano-SiO2, 5-18 wt% organosilicon, and has a light transmittance of ≥88%.

9. The method for preparing the long-lasting phosphorescent coating according to any one of claims 1-8, characterized in that, The method for preparing the phosphorescent base coating includes: dispersing the acrylic emulsion, titanium dioxide, AH-805W phosphorescent material, sodium polycarboxylate dispersant and metal soap defoamer at high speed of 800-1500 rpm, followed by sand milling to obtain the phosphorescent base coating. The method for preparing the luminescence-enhancing intermediate coating includes: stirring and grinding the modified acrylic emulsion, AH-805W type phosphorescent material, AH-812W phosphorescent material, sodium polycarboxylate dispersant and anti-settling agent at low speed to obtain the luminescence-enhancing intermediate coating; The method for preparing the transparent surface coating includes: stirring the dual emulsion compound system, nano-SiO2 and organosilicon at high speed and then defoaming to obtain the transparent surface coating.

10. The application of a long-lasting phosphorescent coating as described in any one of claims 1-8 or a long-lasting phosphorescent coating obtained by the preparation method described in claim 9 in the preparation of functional coatings for transportation facilities.

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