Two-component photoinduced energy storage diffuse reflection nano coating as well as preparation method and application thereof

Abstract

The invention discloses a two-component photoinduced energy storage diffuse reflection nano coating as well as a preparation method and application thereof, and belongs to the technical field of building materials. Comprising prime paint and surface paint, the prime paint comprises 45-55 parts of paint emulsion, 30-40 parts of titanium dioxide, 5-10 parts of precipitated barium sulphate powder, 5-10 parts of pearl powder, fumed silica, an anti-settling agent, a light stabilizer, a dispersing agent and a coalescing agent; the surface layer coating is prepared from 55 to 65 parts of coating emulsion, 20 to 30 parts of alkaline earth aluminate, 10 to 15 parts of hollow glass beads, 5 to 10 parts of pearl powder, an anti-settling agent, a light stabilizer, a dispersing agent and a coalescing agent; the coating emulsion comprises acrylic resin and epoxy acrylate; the coating disclosed by the invention has excellent photoinduced energy storage performance and a good diffuse reflection effect, and can meet illumination requirements in environments such as underground parking lots, underground commercial plazas, traffic tunnels, civil air defense projects or military underground facilities.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and specifically relates to a two-component light-storage diffuse reflection nano coating, a preparation method thereof, and an application thereof. Background Art

[0002] With socioeconomic development, the development and utilization of various underground spaces, driven by both people's livelihoods and career needs, and national security and war preparedness, has accelerated. For example, underground parking lots, commercial plazas, transportation tunnels, civil air defense projects, and military underground facilities are all examples, and the scale of construction and utilization is rapidly increasing. However, due to the unique structural characteristics of underground spaces, they cannot directly receive natural light. However, all underground spaces have technical requirements for sufficient lighting intensity, so artificial lighting is used to provide the basic illumination required for these applications.

[0003] Under current technological conditions, fire-retardant paint or ceramic tiles are commonly used to decorate the walls of various underground spaces. However, due to the low reflectivity of these materials, they cannot enhance the brightness of the application scenario or produce noticeable light spots. The projection range of lighting blocked by objects poses a safety hazard in underground spaces. Furthermore, the extensive lighting facilities and energy-efficiency configurations not only increase the investment in underground space lighting systems, but also create significant cost pressures for subsequent operations due to the ongoing electricity costs of lighting.

[0004] Therefore, it is extremely important to research and develop a photo-energy storage diffuse reflective optical nano-coating technology product to improve the quality of underground space environment lighting, enhance the brightness and uniformity of light in application scenarios, and reduce lighting energy consumption. Summary of the Invention

[0005] The purpose of the present invention is to provide a two-component photo-energy storage diffuse reflective nano coating and its preparation method and application. The coating has excellent photo-energy storage performance and good diffuse reflective effect, and can meet the lighting needs of underground space environment.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A two-component photo-energy storage diffuse reflective nano coating, comprising a base coating and a top coating;

[0008] The primer comprises 45 to 55 parts of a coating emulsion, 30 to 40 parts of titanium dioxide, 5 to 10 parts of precipitated barium sulfate powder, 5 to 10 parts of pearlescent powder, fumed silica, an anti-settling agent, a light stabilizer, a dispersant, and a film-forming aid;

[0009] The surface coating comprises 55 to 65 parts of coating emulsion, 20 to 30 parts of alkaline earth aluminate, 10 to 15 parts of hollow glass microspheres, 5 to 10 parts of pearlescent powder, anti-settling agent, light stabilizer, dispersant and film-forming aid;

[0010] The coating emulsion comprises acrylic resin and epoxy acrylate, and the mass ratio of the acrylic resin to the epoxy acrylate is (50-60): (25-35);

[0011] The alkaline earth aluminate is SrAl2O4:Eu2 + ,Dy3 + .

[0012] In the basecoat of the above scheme, titanium dioxide serves as the main white pigment and light-reflecting material, providing good hiding power and initial reflection effect; precipitated barium sulfate powder can further enhance the filling property and wear resistance of the coating; pearlescent powder gives the coating a unique gloss and texture; fumed silica helps improve the rheological properties of the coating and prevent pigment precipitation; anti-settling agents, light stabilizers, dispersants and film-forming aids work synergistically to ensure the stability and good film-forming properties of the coating.

[0013] In the surface coating, alkaline earth aluminate is the core material for photoenergy storage, which can absorb light energy from the environment and slowly release it in the dark to achieve long-lasting lighting; hollow glass microspheres have good optical properties and can significantly improve the diffuse reflection effect of the coating, making the light more evenly distributed; pearlescent powder is also used to improve the appearance of the coating, and additives such as anti-settling agents ensure the stability of the coating performance.

[0014] In the paint emulsion used in the topcoat and basecoat, acrylic resin has good weather resistance and flexibility, while epoxy acrylate gives the paint higher hardness and strength. The combination of the two gives the paint emulsion excellent comprehensive performance.

[0015] In addition, in alkaline earth aluminates, Eu2 + As the main luminescent ion, it can produce strong visible light emission after being excited. Its emission spectrum is usually in the blue-green region, with high luminous efficiency and brightness. + As an auxiliary activator, it can effectively improve the afterglow performance of the luminescent material and prolong the luminescence time. It regulates Eu2 + The luminescence process enables the material to continue to glow for a long time after the excitation stops, meeting the demand of photo-storage diffuse reflective nano-coatings for long-lasting luminescence.

[0016] As some possible implementation methods of the present application, the epoxy acrylate is replaced by a modified epoxy acrylate, and the acrylic resin is replaced by a modified acrylic resin;

[0017] The modified epoxy acrylate is polyether diol modified epoxy acrylate; the modified acrylic resin is fluorosilicone synergistically modified acrylic resin.

[0018] In this solution, polyether diol-modified epoxy acrylate can improve the flexibility and impact resistance of the coating and reduce the brittleness and cracking of the coating compared to epoxy acrylate, but it will lead to a decrease in the water resistance and weather resistance of the coating.

[0019] Compared with acrylic resin, fluorosilicone synergistically modified acrylic resin can significantly enhance the water resistance, stain resistance and weather resistance of the coating, effectively overcome the problems of water resistance and weather resistance caused by modified epoxy acrylate, and enable the coating to maintain good appearance and performance in complex environments.

[0020] As some possible implementation methods of the present application, the titanium dioxide is replaced by modified titanium dioxide, wherein the modified titanium dioxide is obtained by first modifying the titanium dioxide with a silane coupling agent and then coating the surface with a silica shell.

[0021] In this solution, the silane coupling agent modification enhances the compatibility of titanium dioxide with the coating emulsion, while the silica shell effectively inhibits the photocatalytic activity of titanium dioxide (especially at the entrances and exits of underground space environments, such as tunnels), preventing it from damaging the organic components in the coating. At the same time, it can also improve the dispersibility and weather resistance of titanium dioxide, further enhancing the performance of the base coating.

[0022] As some possible implementation methods of the present application, the thickness of the silica shell layer in the modified titanium dioxide is 3 to 10 nm.

[0023] As some possible implementation methods of the present application, the alkaline earth aluminate is replaced by a modified alkaline earth aluminate, wherein the modified alkaline earth aluminate is obtained by first modifying the alkaline earth aluminate with a silane coupling agent and then coating the surface with a silica shell.

[0024] In this scheme, the dual modification of the silane coupling agent and the silica shell effectively improves the stability and dispersibility of the alkaline earth aluminate. The silane coupling agent (such as KH-550) can form a continuous Si-O-Si bond network between the alkaline earth aluminate and the shell, significantly enhancing interfacial bonding. The tight chemical bonding reduces interfacial defects and voids between the alkaline earth aluminate and the shell, reducing energy losses during energy transfer. Electron-hole pairs generated by the excitation light can more efficiently migrate between the alkaline earth aluminate and the shell, avoiding energy quenching caused by interface mismatch, thereby improving overall luminescence efficiency.

[0025] In addition, the dense SiO2 shell can effectively block water molecules and alkaline earth metal ions (such as Sr 2+ ) contact, inhibiting the hydrolysis reaction and effectively extending the luminous life of the coating.

[0026] As some possible implementation methods of the present application, the silica shell thickness in the modified alkaline earth aluminate is 5 to 10 nm. In this solution, by limiting the shell thickness, it is possible to effectively isolate moisture and control the luminescence intensity loss caused by light scattering and absorption within a small range.

[0027] As some possible implementation methods of the present application, the silica shell layer in the modified alkaline earth aluminate is doped with an optically active substance, and the optically active substance is Eu3 + and Tb 3+ .

[0028] In this scheme, the incorporated Eu 3+ and Tb 3+ Optically active substances such as iodine broaden the excitation spectrum of alkaline earth aluminate, improve its luminous efficiency and luminous stability, prolong the afterglow time, and make the photoenergy storage performance of the surface coating more excellent.

[0029] As some possible implementation methods of the present application, the particle size of the hollow glass microspheres is 75 to 150 μm; the particle size of the titanium dioxide is 0.2 to 0.3 μm; the particle size of the precipitated barium sulfate powder is 10 to 30 μm; and the particle size of the pearlescent powder is 50 to 200 μm.

[0030] In this solution, the use of appropriate particle size helps to evenly disperse the raw materials in the coating, give full play to their performance advantages, and ensure the uniformity and stability of the coating.

[0031] In addition, to achieve the above-mentioned object, the present invention also provides a method for preparing a two-component photo-energy storage diffuse reflective nano-coating, wherein the preparation method of the primer coating comprises: fully mixing a coating emulsion, titanium dioxide, precipitated barium sulfate powder and pearlescent powder, then adding an anti-settling agent, a light stabilizer, a dispersant and a film-forming aid, and fully dispersing to obtain the primer coating;

[0032] The preparation method of the surface coating comprises the following steps: fully mixing coating emulsion, alkaline earth aluminate, hollow glass microspheres and pearlescent powder, then adding anti-settling agent, light stabilizer, dispersant and film-forming aid, and fully dispersing to obtain the surface coating.

[0033] In this solution, the main pigments and fillers are mixed first, and then the additives are added to ensure that the ingredients are fully dispersed, avoiding problems such as pigment agglomeration caused by premature addition of additives.

[0034] Furthermore, to achieve the above-mentioned purpose, the present invention also provides the application of a two-component photo-energy storage diffuse reflective nano-coating in an underground space environment, wherein the underground space environment includes an underground parking lot, an underground commercial plaza, a traffic tunnel, an air defense project or a military underground facility.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention has excellent photo-energy storage performance and diffuse reflection effects, and can provide continuous auxiliary lighting for places in low-light environments, greatly improving safety. Specifically, after absorbing light energy, the alkaline earth aluminate in the coating can stably release light for a long time, achieving long-term lighting, providing continuous auxiliary lighting for places in low-light environments, and greatly improving safety. The synergistic effect of materials such as titanium dioxide in the base coating and hollow glass microspheres in the top coating significantly improves the diffuse reflection performance of the coating, evenly distributing light in space, avoiding light concentration or the occurrence of shadow areas, and improving the lighting environment.

[0037] 2. The present invention effectively improves the photo-induced energy storage performance, diffuse reflection performance, weather resistance, water resistance, stain resistance and wear resistance of the coating by modifying raw materials such as coating emulsion, titanium dioxide and alkaline earth aluminate, thereby extending the service life of the coating and reducing maintenance costs. DETAILED DESCRIPTION

[0038] Example 1

[0039] Primer preparation:

[0040] Weigh 45 parts of coating emulsion, 36 parts of titanium dioxide (particle size 0.2-0.3 μm), 5 parts of precipitated barium sulfate powder (particle size 10-30 μm), and 8 parts of pearl powder (particle size 50-100 μm), place them in a stirring container, and stir at a speed of 800 r / min for 15 minutes to mix thoroughly. Then add 0.5 parts of fumed silica, 1 part of anti-settling agent (organic bentonite anti-settling agent), 1 part of light stabilizer (hindered amine light stabilizer), 1 part of dispersant (Disperbyk-163), and 2 parts of film-forming aid (propylene glycol phenyl ether) in sequence, continue stirring for 30 minutes, and increase the speed to 1200 r / min to obtain a primer.

[0041] Preparation of surface coating:

[0042] Weigh 55 parts of coating emulsion, 30 parts of alkaline earth aluminate (SrAl2O4:Eu2 + ,Dy3 + The synthesis method is an existing technology, and reference can be made to Yuan Ximing et al.'s "Preparation of Long-lasting Luminescent Materials SrAl2O4:Eu2 by Coprecipitation" + ,Dy3 + ), 12 parts hollow glass microspheres (particle size 100-150 μm, bulk density 0.3-0.6 g / cm 3, compressive strength ≥8MPa), 5 parts of pearlescent powder (particle size 50-100μm), stirred at 800r / min for 15 minutes in a stirring container. Then, 1 part of anti-settling agent (organic bentonite anti-settling agent), 1 part of light stabilizer (hindered amine light stabilizer), 1 part of dispersant (Disperbyk-163) and 2 parts of film-forming aid (propylene glycol phenyl ether) were added in sequence, and stirred at 1200r / min for 30 minutes to prepare the topcoat.

[0043] Wherein, the coating emulsion preparation method is as follows:

[0044] 55 parts of acrylic resin, 30 parts of epoxy acrylate, 15 parts of xylene, and 3 parts of additives (including benzoyl peroxide, triethylamine, and BYK-358N, with a mass ratio of 1.3:1:1) were weighed and stirred at a speed of 2000 rpm for 20 minutes to prepare a coating emulsion.

[0045] Example 2

[0046] Primer preparation:

[0047] Weigh 50 parts of coating emulsion, 33 parts of titanium dioxide (0.2-0.3 μm), 10 parts of precipitated barium sulfate powder (10-30 μm), and 7 parts of pearl powder (50-100 μm), place them in a stirring container, and stir at a speed of 800 r / min for 15 minutes to mix thoroughly. Then add 0.5 parts of fumed silica, 1 part of anti-settling agent (organic bentonite anti-settling agent), 1 part of light stabilizer (hindered amine light stabilizer), 1 part of dispersant (Disperbyk-163), and 2 parts of film-forming aid (propylene glycol phenyl ether) in sequence, continue stirring for 30 minutes, and increase the speed to 1200 r / min to obtain a primer.

[0048] Preparation of surface coating:

[0049] Weigh 58 parts of coating emulsion, 28 parts of alkaline earth aluminate (SrAl2O4:Eu2 + ,Dy3 + , prepared in the same manner as in Example 1), 12 parts of hollow glass microspheres (particle size 100-150 μm, bulk density 0.3-0.6 g / cm 3 , compressive strength ≥8MPa), 6 parts of pearlescent powder (particle size 50-100μm), stirred at 800r / min for 15 minutes in a stirring container. Then, 1 part of anti-settling agent (organic bentonite anti-settling agent), 1 part of light stabilizer (hindered amine light stabilizer), 1 part of dispersant (Disperbyk-163) and 2 parts of film-forming aid (propylene glycol phenyl ether) were added in sequence, and stirred at 1200r / min for 30 minutes to prepare the topcoat.

[0050] Wherein, the coating emulsion preparation method is as follows:

[0051] 55 parts of acrylic resin, 30 parts of epoxy acrylate, 15 parts of xylene, and 3 parts of additives (including benzoyl peroxide, triethylamine, and BYK-358N, with a mass ratio of 1.3:1:1) were weighed and stirred at a speed of 2000 rpm for 20 minutes to prepare a coating emulsion.

[0052] Example 3

[0053] Based on Example 1, the acrylic resin and epoxy acrylate in the coating emulsion were replaced by fluorosilicone-modified acrylic resin and polyether diol-modified epoxy acrylate, respectively. The remaining components, parameters, and preparation steps were the same as in Example 1.

[0054] The preparation method of the fluorosilicone synergistically modified acrylic resin is as follows:

[0055] S1. Add 80g of deionized water to a 1L four-necked flask and place it in a constant temperature water bath and heat it to 50°C. Add 1.5g of sodium lauryl sulfate and stir at a stirring speed of 500rpm for 10min to completely dissolve it. Then add 1.0g of nonylphenol polyoxyethylene ether (OP-10) and continue stirring until it is completely dissolved. Subsequently, 50g of methyl methacrylate, 30g of butyl acrylate, 10g of trifluoroethyl methacrylate and pretreated methacryloxypropyltrimethoxysilane (5g of methacryloxypropyltrimethoxysilane was dissolved in 5g of deionized water, the pH was adjusted to 4.5 with hydrochloric acid, and the mixture was stirred and hydrolyzed at room temperature for 15min. After the hydrolysis was completed, pretreated methacryloxypropyltrimethoxysilane was obtained) and stirred thoroughly to form a uniform pre-emulsion.

[0056] 0.5 g of ammonium persulfate was taken and dissolved in 10 g of deionized water. The solution was stirred at room temperature until the solution was completely dissolved. The solution was then filtered to remove insoluble impurities to obtain an initiator solution.

[0057] S2. Transfer one-third of the pre-emulsion to the reactor, then add half of the initiator solution. Raise the temperature to 75°C at a rate of 2°C / min, maintaining a stirring speed of 300 rpm. Once at 75°C, maintain the reaction for 1 hour.

[0058] The remaining pre-emulsion and initiator solution were then added simultaneously to the reactor via a constant-pressure dropping funnel at a rate of 3–5 drops / second. The reaction temperature was strictly controlled at 75 ± 1°C during the addition process. The addition was continued for 2 hours. After the addition was complete, the reaction was continued at 75°C for 1 hour. Next, 0.1 g of ammonium persulfate was dissolved in 5 g of water and added to the reaction system. The temperature was raised to 80°C and the reaction continued for 30 minutes.

[0059] After the reaction is complete, the reaction system is cooled to 40°C. A 25% aqueous ammonia solution is used to adjust the pH of the system to 7.5-8.0. 2g of propylene glycol phenyl ether is added as a film-forming aid. Stirring is maintained at 300 rpm for 30 minutes to thoroughly mix the ingredients. Finally, the mixture is filtered through a 100-mesh filter to remove impurities that may have been generated during the reaction, yielding a fluorosilicone-modified acrylic resin emulsion.

[0060] The preparation method of polyether diol modified epoxy acrylate is as follows:

[0061] S1. Place a four-necked flask in an oil bath. Add 200g of epoxy resin E-51 and slowly heat to 100°C to completely melt it. Then slowly add 100g of dehydrated PPG-1000 dropwise, controlling the addition rate to complete within 30 minutes. After the addition is complete, add 2g of boron trifluoride etherate catalyst and stir evenly. Then, raise the oil bath temperature to 130°C and maintain this temperature for 3 hours, continuously purging with nitrogen. The reaction is considered terminated when the epoxy value is ≤0.05eq / 100g.

[0062] S2. Cool the product in S1 to 80°C, add 72g of acrylic acid, 1g of hydroquinone as a polymerization inhibitor, and 3g of triethylamine as a catalyst, and slowly raise the temperature to 110°C. Continue stirring under a nitrogen atmosphere. When the acid value drops to ≤5mg KOH / g, stop heating and continue stirring to cool to 60°C.

[0063] S3. Add 100 g of butyl acetate to the cooled reaction system in S2 and stir for 30 minutes to completely dissolve the product. Transfer the solution to a separatory funnel and wash several times with 5% sodium bicarbonate solution, then with deionized water until neutral. The organic phase is then distilled under reduced pressure at 60°C and 20 mmHg until constant weight is achieved. After cooling to room temperature, filter through a 100-mesh filter to obtain a polyether diol-modified epoxy acrylate.

[0064] Example 4

[0065] Compared with Example 1, the titanium dioxide was changed to modified titanium dioxide, and the remaining components, parameters and preparation steps were the same as those in Example 1.

[0066] Wherein, the preparation method of the modified titanium dioxide is as follows:

[0067] S1. Add 100g of dried rutile titanium dioxide to 500ml of a mixed solvent (deionized water and anhydrous ethanol, volume ratio of 4:1) and stir at 800rpm for 30min to form a uniform suspension. Then slowly add 50ml of diluted KH550 solution [diluted to 5% (v / v) concentration with anhydrous ethanol before use], then heat to 60°C and react under nitrogen for 2h, during which the stirring speed is maintained at 1000rpm. Then centrifuge, wash, and vacuum dry at 80°C for 6h to obtain silane-modified titanium dioxide;

[0068] S2. Disperse the silane-modified titanium dioxide in 500 ml of deionized water and ultrasonicate for 20 minutes. Then, under vigorous stirring (1500 rpm), slowly add 50 ml of ethyl orthosilicate dropwise. Simultaneously, adjust the pH to 8-9 by adding 25% aqueous ammonia. Maintain the reaction temperature at 50°C and continue stirring for 4 hours. After the reaction, wash the suspension three times with deionized water to remove residual salts and once with anhydrous ethanol. Finally, vacuum dry at 80°C for 8 hours and grind through a 200-mesh sieve to obtain the modified titanium dioxide.

[0069] Example 5

[0070] Compared with Example 3, the alkaline earth aluminate was changed to modified alkaline earth aluminate, and the remaining components, parameters and preparation steps were the same as those in Example 3.

[0071] Wherein, the preparation method of the modified alkaline earth aluminate is as follows:

[0072] S1. Dried 100gSrAl2O4:Eu 2+ ,Dy 3+ Add 800 mL of deionized water and 5 mL of a 0.5% sodium hexametaphosphate aqueous solution as a dispersing aid, and stir at a speed of 1200 r / min for 30 minutes to uniformly disperse the powder and form a stable suspension.

[0073] Dilute 10 mL of KH550 with anhydrous ethanol to a 5% (v / v) solution and slowly drip into the suspension. After the addition is complete, heat to 60°C and react at 1000 rpm for 2 hours under a nitrogen atmosphere. After the reaction is complete, centrifuge, wash, and vacuum dry at 80°C for 8 hours. Grind through a 200-mesh sieve to obtain the silane-modified alkaline earth aluminate.

[0074] S2. Secondary Dispersion: Disperse the silane-coupling agent-modified alkaline earth aluminate in 800 mL of deionized water and ultrasonicate for 20 minutes. Then, under vigorous stirring (1500 rpm), slowly add 50 mL of ethyl orthosilicate dropwise, and simultaneously adjust the pH of the system to 8-9 by adding 25% aqueous ammonia. After the addition is complete, maintain the reaction temperature at 50°C and continue stirring for 4 hours. After the reaction is complete, wash the suspension three times with deionized water to remove residual salts and then wash once with anhydrous ethanol. Finally, dry the product under vacuum at 80°C for 10 hours and grind it through a 200-mesh sieve to obtain the modified alkaline earth aluminate.

[0075] Example 6

[0076] Based on Example 4, Eu was doped into the silica shell of the modified alkaline earth aluminate. 3+ and Tb 3+ The remaining components, parameters, and preparation steps are the same as those in Example 3.

[0077] The specific methods of doping are as follows:

[0078] S1. Add 1g of Eu(NO3)3·6H2O and 1g of Tb(NO3)3·6H2O to 50mL of anhydrous ethanol respectively and stir at 500r / min for 20min to completely dissolve them. Then, mix the two solutions and further dilute them by adding 300mL of anhydrous ethanol. Continue stirring for 10min to obtain a uniform doping solution.

[0079] S2. Add 100g of modified alkaline earth aluminate to 800mL of deionized water, disperse the equipment to form a uniform suspension, and then slowly add the doping solution at a rate of 3-5mL / min under high-speed stirring at 1500r / min; after the addition is completed, slowly add 5mL of ethyl orthosilicate and 25% ammonia water to adjust the pH value of the solution to 8-9; then maintain the reaction temperature at 50°C and continue the reaction for 5h, and continuously introduce nitrogen protection during the reaction; after the reaction is completed, add 37% hydrochloric acid to adjust the pH value to 7 to terminate the hydrolysis reaction.

[0080] The product was then centrifuged, washed, and vacuum dried at 80° C. for 12 h. After drying, it was ground and passed through a 200-mesh sieve to obtain the final modified product.

[0081] Performance Testing

[0082] Glazed ceramic tiles commonly used in tunnels were selected, and the two-component photo-energy storage diffuse reflective nano-coatings prepared in Examples 1 to 6 were sprayed on the ceramic tile surfaces. Before spraying, the ceramic tile was wiped with alcohol to remove surface oil and dust to ensure that the surface was clean and dry. The air spraying method was adopted with a spraying pressure of 0.5 MPa and a distance of 20-25 cm between the spray gun and the ceramic tile surface. The base coating (100 μm ± 10 μm) and the top coating (140 μm ± 10 μm) were evenly sprayed. After spraying, the ceramic tile was dried for 7 days at room temperature (25 ± 2 ° C) and relative humidity (60 ± 5)% to completely cure the coating.

[0083] The coatings of Examples 1 to 6 were subjected to the following performance tests:

[0084] (1) Photo-energy storage performance test: After the sprayed ceramic tile sample was irradiated at a light intensity of 1000 lx for 1 hour, it was quickly transferred to a dark room. The luminous intensity of the sample surface was measured every 5 minutes using an ST-862 digital illuminometer. The initial luminous intensity (the value measured immediately after the irradiation) and the luminous intensity decayed to 0.32 mcd / m were recorded. 2 The time is called afterglow time.

[0085] (2) Diffuse reflectance test: Use a UV-2600 UV-visible spectrophotometer with an integrating sphere accessory to measure the diffuse reflectance of the sample in the visible light band of 400-700nm. Using a barium sulfate white plate as the reference standard, measure each sample three times and take the average value as the final result.

[0086] (3) Water resistance test method: Use room temperature immersion test. Immerse the painted tile sample completely in deionized water at a temperature of (23±2)℃ for 96 hours. During the immersion process, observe the surface condition of the sample every 24 hours and record whether there is blistering, peeling, discoloration, whitening, etc.

[0087] (4) Weathering performance test: The test was conducted using a QUV accelerated aging test chamber. The test conditions were set as follows: UV wavelength 340nm, irradiance 0.89W / m 2 , illumination cycle 8h (temperature 60±2℃), condensation cycle 4h (temperature 50±2℃), after 1000h of cycle test, observe the color change of the sample surface (use a colorimeter to measure the color difference ΔE) and coating peeling.

[0088] (5) Wear resistance test: Use a wear tester and the Taber wear test method. Fix the sample on the tester turntable, select a CS-10 rubber grinding wheel, apply a load of 1000g, and rotate at a speed of 60r / min. Record the number of revolutions when the sample coating is worn through to evaluate the wear resistance of the coating.

[0089] (6) Adhesion test: The test is conducted using the cross-hatch method. A special cross-hatch knife is used to scratch a 1mm×1mm grid on the coating surface, with the grid depth reaching the tile substrate. 3M tape (No. 600) is then applied to the cross-hatch area. The tape is quickly peeled off and the coating is observed for any detachment. The test is graded on a scale of 0-5, with 0 indicating the best adhesion and no detachment; 5 indicating the worst adhesion and detachment over a large area.

[0090] The test results are shown in Table 1.

[0091] Table 1:

[0092]

[0093]

[0094] in conclusion:

[0095] (1) Photoelectric energy storage performance

[0096] Initial luminous intensity: The initial luminous intensity of Example 1 is 789mcd / m 2 With the changes in the components in the examples, such as replacing the resin in the coating emulsion with a modified resin in Example 3, modifying the titanium dioxide in Example 4, and modifying the alkaline earth aluminate in Examples 5 and 6, the luminous intensity gradually increased, reaching 1320 mcd / m in Example 6. 2 This is because the modified resin improves the microstructure of the coating, which is beneficial to the dispersion and excitation of the luminescent ions; the modified alkaline earth aluminate and the Eu doped in Example 6 3+ and Tb 3+ The excitation spectrum range is broadened and the luminous efficiency is enhanced. In tunnels, the higher initial luminous intensity can provide brighter lighting at night or in low light conditions, improving visibility in tunnels and ensuring driving safety.

[0097] Afterglow time: Example 1 has an afterglow time of 5.9 hours, while Example 6 reaches 10.9 hours. This extended afterglow time helps maintain a certain level of brightness after the light fades, reducing visual discomfort for drivers caused by sudden changes in light in tunnels. The modification of the alkaline earth aluminate in Examples 5 and 6, as well as the doping treatment in Example 6, optimizes the performance of the luminescent material, resulting in more sustained energy storage and release.

[0098] (2) Diffuse reflection performance

[0099] The diffuse reflectivity gradually increases from 75% in Example 1 to 92% in Example 6. This is due to the modification of components such as titanium dioxide and alkaline earth aluminate in these examples, as well as the enhanced synergy between these components, which results in a more uniform and rough coating surface, enabling more effective light scattering. In tunnels, the high diffuse reflectivity coating can evenly distribute limited light to every corner of the tunnel, reducing blind spots, improving lighting quality, and reducing energy consumption.

[0100] (3) Water resistance

[0101] After 24 hours of immersion, a small number of tiny bubbles appeared on the surface of Example 1. After 96 hours, the number of bubbles increased and a slight whitening appeared in some areas. Example 2 showed similar phenomena to Example 1, but the number of bubbles was relatively small. This indicates that the water resistance of the coating with the basic formula is relatively weak.

[0102] The modification of the coating emulsion and titanium dioxide in Examples 3 and 4 improved the water resistance. For example, only a small amount of bubbles appeared after 48 hours of immersion in Example 3, and there was no obvious increase in bubbles after 96 hours, and there was no whitening or peeling on the surface.

[0103] After modifying the alkaline earth aluminate in Examples 5 and 6, water resistance was significantly improved, with no bubbles, discoloration, or flaking during the entire immersion process. Given the humid environment within tunnels, good water resistance prevents damage to the coating from prolonged moisture exposure, extending its service life and reducing maintenance costs.

[0104] (4) Weather resistance

[0105] Weather resistance is measured by color difference (ΔE). Example 1 has a ΔE of 4.2, while Example 6 has a ΔE of 1.5. Modifications to components such as the coating emulsion, titanium dioxide, and alkaline earth aluminate in these examples enhance the coating's resistance to environmental damage, including UV rays, while color difference gradually decreases. In tunnels, particularly at entrances and exits, excellent weather resistance maintains the coating's color stability and appearance, enhancing the tunnel's aesthetic appeal.

[0106] (5) Wear resistance

[0107] The wear-resistant revolutions increased from 800 in Example 1 to 1450 in Example 6. The modifications to the coating components in Examples 3-6 enhanced the coating's hardness and wear resistance. Frequent vehicle traffic in tunnels causes wear and tear from wheel-ground friction and airflow generated by vehicle travel. A highly wear-resistant coating can better withstand this wear and tear, maintaining its integrity and performance.

[0108] (6) Adhesion performance

[0109] The adhesion of Examples 1 and 2 was Level 2, while that of Examples 3 and 4 was improved to Level 1, and that of Examples 5 and 6 reached Level 0. The synergistic effect of the modified alkaline earth aluminate and other components enhanced the adhesion of the coating to the tile surface. In tunnel environments, this excellent adhesion ensures that the coating is not easily detached during long-term use, preventing any impact on driving safety caused by coating detachment.

[0110] In summary, the coatings in Examples 1 to 6 above all exhibit certain performance effects in tunnel application scenarios. As basic formula products, the coatings in Examples 1 and 2 have basic properties in terms of photo-energy storage and diffuse reflection, and can provide a certain degree of night lighting and light scattering effects for tunnels; they also have corresponding performance in terms of water resistance, weather resistance, wear resistance and adhesion, and can meet the basic requirements for tunnel use. Starting from Example 3, with the gradual modification of components such as coating emulsion, titanium dioxide, alkaline earth aluminate, etc., the performance of the coating in all aspects has been significantly improved, and it can better meet the stringent requirements of tunnels for high performance and long life of coatings.

Claims

1. A two-component photo-energy storage diffuse reflective nano coating, characterized in that: Including primer and topcoat; The primer comprises 45 to 55 parts of a coating emulsion, 30 to 40 parts of titanium dioxide, 5 to 10 parts of precipitated barium sulfate powder, 5 to 10 parts of pearlescent powder, fumed silica, an anti-settling agent, a light stabilizer, a dispersant, and a film-forming aid; The surface coating comprises 55 to 65 parts of coating emulsion, 20 to 30 parts of alkaline earth aluminate, 10 to 15 parts of hollow glass microspheres, 5 to 10 parts of pearlescent powder, anti-settling agent, light stabilizer, dispersant and film-forming aid; The coating emulsion includes acrylic resin and epoxy acrylate; The alkaline earth aluminate is SrAl2O4:Eu2 + ,Dy3 + .

2. A two-component photo-energy storage diffuse reflective nano coating according to claim 1, characterized in that: The epoxy acrylate is replaced by a modified epoxy acrylate, and the acrylic resin is replaced by a modified acrylic resin; The modified epoxy acrylate is polyether diol modified epoxy acrylate; The modified acrylic resin is a fluorosilicone-synergistically modified acrylic resin.

3. The two-component photo-energy storage diffuse reflective nano coating according to claim 1, characterized in that: The titanium dioxide is replaced by modified titanium dioxide, wherein the modified titanium dioxide is obtained by first modifying the titanium dioxide with a silane coupling agent and then coating the surface with a silicon dioxide shell layer.

4. The two-component photo-energy storage diffuse reflective nano coating according to claim 3, characterized in that: The thickness of the silicon dioxide shell layer in the modified titanium dioxide is 3 to 10 nm.

5. The two-component photo-energy storage diffuse reflective nano coating according to claim 1, characterized in that: The alkaline earth aluminate is replaced by a modified alkaline earth aluminate, wherein the modified alkaline earth aluminate is obtained by first modifying the alkaline earth aluminate with a silane coupling agent and then coating the surface with a silicon dioxide shell layer.

6. The two-component photo-energy storage diffuse reflective nano coating according to claim 5, characterized in that: The thickness of the silicon dioxide shell in the modified alkaline earth aluminate is 5 to 10 nm.

7. The two-component photo-energy storage diffuse reflective nano coating according to claim 6, characterized in that: The silicon dioxide shell in the modified alkaline earth aluminate is doped with an optically active substance, and the optically active substance is Eu3 + and Tb 3+ .

8. The two-component photo-energy storage diffuse reflective nano coating according to claim 1, characterized in that: The particle size of the hollow glass microbeads is 75 to 150 μm; the particle size of the titanium dioxide is 0.2 to 0.3 μm; the particle size of the precipitated barium sulfate powder is 10 to 30 μm; and the particle size of the pearlescent powder is 50 to 200 μm.

9. The method for preparing a two-component photo-energy storage diffuse reflective nano coating according to claim 1, characterized in that: The preparation method of the primer is as follows: the coating emulsion, titanium dioxide, precipitated barium sulfate powder and pearl powder are fully mixed, and then an anti-settling agent, a light stabilizer, a dispersant and a film-forming aid are added, and the primer is obtained after being fully dispersed; The preparation method of the surface coating comprises the following steps: fully mixing coating emulsion, alkaline earth aluminate, hollow glass microspheres and pearlescent powder, then adding anti-settling agent, light stabilizer, dispersant and film-forming aid, and fully dispersing to obtain the surface coating.

10. The use of the two-component photo-energy storage diffuse reflective nano coating in an underground space environment according to claim 1, characterized in that: The underground space environment includes underground parking lots, underground commercial plazas, traffic tunnels, civil air defense projects or military underground facilities.

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