Method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature

Abstract

The invention discloses a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature, and relates to the technical field of functional paints.The method comprises the steps that weighed matrix paint is put into a mixing container with a baffle, a mechanical stirring device matched with the mixing container is started, and the matrix paint is stirred according to the stirring temperature and the stirring rotating speed; selecting a diluent with a preset mass from the weighed diluents, and adding the selected diluent into the stirred matrix coating to form a flow shear field; adding the weighed rare earth fluorescent powder into the flow shear field in batches, and continuously stirring until the rare earth fluorescent powder is uniformly dispersed in the mixing container; and after the rare earth fluorescent powder is uniformly dispersed, sequentially adding the residual diluent and the weighed curing agent, and continuously stirring until the homogenized luminous paint is obtained. Brightness attenuation and water resistance reduction caused by over-grinding are reduced, and stable output of afterglow intensity and luminescence duration is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of functional coatings technology, and more specifically, to a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature. Background Technology

[0002] Rare-earth long-afterglow materials, due to their unique light energy storage and slow release characteristics, have significant application prospects in fields such as anti-counterfeiting labels, bio-imaging, optoelectronic sensing, and passive emergency lighting. These materials absorb visible or ultraviolet light, trapping energy in electron / hole traps formed by lattice defects, and then gradually release it through thermal perturbation after excitation ceases, achieving afterglow luminescence lasting for several hours or even more than 12 hours. Among them, alkaline earth aluminates, silicates, and titanates co-doped with rare-earth ions such as Eu²⁺ and Dy³⁺ have become the mainstream long-afterglow matrix materials due to their advantages of high afterglow brightness, long duration, good chemical stability, and non-radioactivity, and are widely used in safety indicators, traffic signs, and architectural decoration.

[0003] Currently, luminescent coatings developed based on these materials are mainly divided into two categories: fluorescent and phosphorescent (long afterglow) types. Fluorescent coatings emit light only momentarily under external light source illumination and extinguish immediately upon removal of the light. Traditional phosphorescent coatings mostly use sulfide or ZnS-based systems, which, although possessing short-lasting afterglow, suffer from low brightness, rapid decay, and poor environmental tolerance (e.g., susceptibility to humidity, heat, sunlight, and salt spray). In recent years, rare-earth activated aluminate / silicate long afterglow materials have significantly improved luminescent performance, but their direct application in paint systems still faces multiple challenges: on the one hand, existing luminescent paints generally have insufficient afterglow time and low initial brightness, making it difficult to meet the practical engineering requirements for long-lasting self-luminescence; on the other hand, most products only focus on luminescence function, lacking the comprehensive performance required for surface engineering such as corrosion resistance, wear resistance, stain resistance, and self-cleaning, resulting in short service life and high maintenance costs. In addition, traditional preparation processes often rely on high-temperature calcination, inert atmosphere protection, or complex post-treatment, making it difficult to achieve multifunctional integration quickly and efficiently at room temperature, thus restricting their promotion in on-site construction and large-scale applications.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] To address the problems in related technologies, this invention proposes a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature, thereby overcoming the aforementioned technical problems existing in the prior art.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows: According to a first aspect of the present invention, a method for rapidly preparing a multifunctional long-afterglow luminescent paint at room temperature is provided, the method comprising: S1. Weigh the base coating, curing agent and diluent according to the preset material ratio, and weigh the corresponding rare earth phosphor according to the mass ratio of rare earth phosphor to base coating. S2. Pour the weighed base coating into a mixing container with baffles, start the mechanical stirring device of the mixing container, and stir the base coating according to the stirring temperature and stirring speed. S3. Select a predetermined mass of diluent from the weighed diluent and add the selected diluent to the stirred base coating to form a flowing shear field; S4. Add the weighed rare earth phosphors to the flowing shear field in batches and stir continuously until the rare earth phosphors are evenly dispersed in the mixing container. S5. After the rare earth phosphor is evenly dispersed, add the remaining diluent and the weighed curing agent in sequence, and continue stirring until a homogenized luminescent paint is obtained.

[0007] Furthermore, the base coating includes one or more mixtures of primer, topcoat, and varnish.

[0008] Furthermore, the curing agent includes one or more of the following: acrylic curing agents, polyurethane curing agents, epoxy curing agents, and amino resin curing agents.

[0009] Furthermore, the thinner includes one or more of the following: nitrocellulose lacquer thinner, chlorinated vinyl lacquer thinner, amino lacquer thinner, acrylic lacquer thinner, alkyd lacquer thinner, epoxy lacquer thinner, and polyurethane lacquer thinner.

[0010] Furthermore, rare earth phosphors include one or more of the following: europium-doped strontium calcium sulfide, europium and dysprosium co-doped strontium aluminate, europium and dysprosium co-doped dicalcium silicate, europium and dysprosium co-doped strontium titanate, and europium and dysprosium co-doped magnesium strontium silicate.

[0011] Furthermore, the mass ratio of rare earth phosphor to matrix coating is 1:(4~8).

[0012] Furthermore, the stirring temperature is 0~30℃, the stirring speed is 150~1000rpm / min, the total stirring time is 5~30min, and the afterglow time of the luminescent paint reaches 3h.

[0013] Furthermore, the preparation method of the multifunctional long afterglow luminescent paint is one or more of the following: mechanical stirring method, vacuum degassing machine method, three-dimensional mixing instrument method, high-speed disperser method, and high-shear homogenizer method.

[0014] According to a second aspect of the present invention, a multifunctional long-afterglow luminescent paint prepared by the aforementioned preparation method is provided.

[0015] According to a third aspect of the present invention, a multifunctional long-afterglow luminescent paint prepared by the above preparation method or the application of the above multifunctional long-afterglow luminescent paint in the field of functional coatings technology is also provided.

[0016] The beneficial effects of this invention are as follows: 1. This invention disperses rare earth phosphors in an ambient temperature of 0~30℃ using a controlled stirring process window of 150~1000rpm and 5~30 minutes, without the need for high-shear equipment such as bead mills or three-roll mills. By batch feeding, gentle shearing and moderate stirring, the performance degradation of rare earth long afterglow luminescent crystals due to excessive breakage or surface defects is avoided, and the brightness decay and water resistance reduction caused by over-grinding are reduced, thereby ensuring stable output of afterglow intensity and luminescence duration.

[0017] 2. The luminescent coating composition of the present invention has good compatibility with conventional primers, topcoats, varnishes and other systems. It can be adapted to various curing systems such as polyurethane, epoxy, and amino and their corresponding thinners, and supports various construction methods such as spraying, rolling and brushing. By controlling the mass ratio of rare earth phosphor to base coating to 1:(4-8) and combining it with viscosity fine-tuning, the luminescent particles can achieve a more uniform spatial distribution in the coating film, thereby suppressing agglomeration, blooming and local dark spot phenomena, and forming a continuous, uniform coating surface with high luminescence consistency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a long-afterglow luminescent paint prepared by a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention. Figure 3 This is a picture of the afterglow color of a long-afterglow paint prepared by a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention, after being excited by 365nm. Figure 4 This is a comparison image of a model before and after coating with long-afterglow luminescent paint, illustrating a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention. Figure 5This is a CIE color coordinate diagram of the luminescent paint after indoor LED lamp irradiation, according to an embodiment of the present invention, which describes a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature. Figure 6 This is a CIE color coordinate diagram of the luminescent paint after being irradiated with a white light flashlight, according to a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention. Figure 7 This is a CIE color coordinate diagram of the luminescent paint after being illuminated by a car high beam after a method for rapidly preparing a multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention. Figure 8 This is an emission spectrum of the luminescent paint after being irradiated by an indoor LED lamp, according to an embodiment of the present invention, which describes a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature. Figure 9 The emission spectrum of the luminescent paint after being irradiated with a white light flashlight is shown in an embodiment of the present invention, which describes a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature. Figure 10 This is an emission spectrum of the luminescent paint after being irradiated by a car high beam, according to an embodiment of the present invention, which describes a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0021] According to an embodiment of the present invention, a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature is provided.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, a method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to an embodiment of the present invention includes: S1. Weigh the base coating, curing agent and diluent according to the preset material ratio, and weigh the corresponding rare earth phosphor according to the mass ratio of rare earth phosphor to base coating. S2. Pour the weighed base coating into a mixing container with baffles, start the mechanical stirring device of the mixing container, and stir the base coating according to the stirring temperature and stirring speed. S3. Select a predetermined mass of diluent from the weighed diluent and add the selected diluent to the stirred base coating to form a flowing shear field; S4. Add the weighed rare earth phosphors to the flowing shear field in batches and stir continuously until the rare earth phosphors are evenly dispersed in the mixing container. S5. After the rare earth phosphor is evenly dispersed, add the remaining diluent and the weighed curing agent in sequence, and continue stirring until a homogenized luminescent paint is obtained.

[0023] It should be further explained that, under normal temperature and pressure, primer / topcoat / clear coat are selected as the base material as needed, and matching curing agent and diluent are added. Rare earth long afterglow powder is slowly added at the set speed and temperature, and the mixture is continuously stirred until the powder is uniformly dispersed in the coating and the system has a consistent appearance, thus obtaining a homogenized luminescent coating composition. In addition, the preparation method of long afterglow luminescent paint is selected from mechanical stirring method, vacuum degassing machine method, three-dimensional mixing instrument method, high-speed disperser method, and high-shear homogenizer method.

[0024] In this alternative embodiment, the base coating includes one or more of the following: primer, topcoat, and varnish.

[0025] In this optional embodiment, the curing agent includes one or more of the following: acrylic curing agents, polyurethane curing agents, epoxy curing agents, and amino resin curing agents.

[0026] In this optional embodiment, the thinner includes one or more of the following: nitrocellulose lacquer thinner, chlorinated vinyl lacquer thinner, amino lacquer thinner, acrylic lacquer thinner, alkyd lacquer thinner, epoxy lacquer thinner, and polyurethane lacquer thinner.

[0027] In this optional embodiment, the rare earth phosphor includes one or more of the following: europium-doped strontium calcium sulfide, europium and dysprosium co-doped strontium aluminate, europium and dysprosium co-doped dicalcium silicate, europium and dysprosium co-doped strontium titanate, and europium and dysprosium co-doped magnesium strontium silicate.

[0028] It should be noted that the rare earth phosphor is selected from europium-doped strontium calcium sulfide (Sr) 0.75 Ca 0.25 S:Eu 2+ Strontium aluminate (SrAl2O4:Eu) co-doped with europium and dysprosium 2+ ,Dy 3+ Europium and dysprosium co-doped dicalcium silicate (Ca2SiO4:Eu) 2+ ,Dy 3+ Strontium titanate (SrTiO3:Eu) co-doped with europium and dysprosium 2+ ,Dy 3+ Sr2MgSi2O7:Eu co-doped magnesium strontium silicate (Sr2MgSi2O7:Eu) 2+ ,Dy 3+ One or more of the following mixtures.

[0029] In this optional embodiment, the mass ratio of rare earth phosphor to matrix coating is 1:(4~8).

[0030] It should be noted that the mass ratio of the base material (i.e., paint), hardener, and thinner is 2:1:0.3.

[0031] In this optional embodiment, the stirring temperature is 0~30℃, the stirring speed is 150~1000rpm / min, the total stirring time is 5~30min, and the afterglow time of the luminescent paint reaches 3h.

[0032] It should be noted that the long-afterglow phosphor, curing agent, thinner and paint should be mixed and stirred for 5~30 minutes; when mechanically stirring, the speed should be 150~1000 rpm / min, the stirring time should be 5~30 minutes, and the stirring temperature should be 0~30℃; specifically, the speed should be 300 rpm / min, the stirring time should be 15 minutes, and the stirring temperature should be 25℃.

[0033] According to a second embodiment of the present invention, a multifunctional long afterglow luminescent paint prepared by the aforementioned preparation method is provided.

[0034] According to a third embodiment of the present invention, the multifunctional long-afterglow luminescent paint prepared by the above preparation method or the application of the above multifunctional long-afterglow luminescent paint in the field of functional coatings technology is also provided.

[0035] It should be added that, such as Figures 2-10 As shown, this invention allows for the addition of different rare earth phosphors during the manufacturing process, enabling long-afterglow luminescent paint to emit different colors of light at night, enriching the architectural artistry and adding to the architectural decoration; among which, Figures 8-10 The horizontal axis represents wavelength (unit: nanometers), and the vertical axis represents luminous intensity (unit: arbitrary unit). Furthermore, the long afterglow luminescent paint of the present invention can maintain high brightness for more than 3 hours after being exposed to sunlight or lamp light for 20 minutes, and it is non-radioactive and can emit light repeatedly for a long time.

[0036] Example 1: In this embodiment, the long afterglow phosphor is selected from (Sr) 0.75 Ca 0.25 S:Eu 2+ SrAl2O4:Eu 2+ ,Dy 3+ and Sr2MgSi2O7:Eu 2+ ,Dy 3+ The mixed powder, using acrylic paint hardener and acrylic paint thinner as the curing agent, is prepared using the following method: Step 1: Weigh 24g of base coating (primer / topcoat / clear varnish, optional or combination), 12g of hardener, and 3.6g of thinner; Step 2: Place the base coating in a mixing container with baffles, turn on the mechanical stirrer (start at 150 rpm / min), and add about 60% of the planned amount of thinner to form a flowable shear field; Step 3: At 25℃, slowly sprinkle rare earth long afterglow powder in batches according to the mass ratio of "powder: paint = 1:6"; after each batch is added, maintain 300 rpm / min and stir for 5 minutes. Observe that there is no dry powder and no obvious agglomeration before continuing to the next batch. Step 4: After all the powder has been added, increase the speed to 300 rpm / min, maintain a constant temperature of 25℃ and continue stirring. The total stirring time should be controlled within 10 minutes. Step 5: Gradually add the remaining diluent to fine-tune the viscosity; then add the curing agent according to the matrix system, mix and stir at 300 rpm / min for 5 min to obtain a homogenized luminescent coating composition.

[0037] Example 2: The preparation method in this embodiment is the same as in Embodiment 1, except that the long afterglow phosphor in step one is selected as (Sr 0.75 Ca 0.25 S:Eu 2+ : The rare earth phosphor and paint were dispersed in 24g of base coating (base / topcoat / clear varnish optional or combination), 12g of curing agent and 3.6g of diluent at a mass ratio of 1:6, and after thorough stirring (15min), a homogenized luminescent coating composition was obtained.

[0038] Example 3:

[0039] The preparation method in this embodiment is the same as in Example 1, except that the long afterglow phosphor in step one is selected as Sr2MgSi2O7:Eu. 2+ ,Dy 3+ : The rare earth phosphor and paint were dispersed in 24g of base coating (base / topcoat / clear varnish optional or combination), 12g of curing agent and 3.6g of diluent at a mass ratio of 1:6, and after thorough stirring (15min), a homogenized luminescent coating composition was obtained.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature, characterized in that, The method includes: S1. Weigh the base coating, curing agent and diluent according to the preset material ratio, and weigh the corresponding rare earth phosphor according to the mass ratio of rare earth phosphor to base coating. S2. Pour the weighed base coating into a mixing container with baffles, start the mechanical stirring device of the mixing container, and stir the base coating according to the stirring temperature and stirring speed. S3. Select a predetermined mass of diluent from the weighed diluent and add the selected diluent to the stirred base coating to form a flowing shear field; S4. Add the weighed rare earth phosphors to the flowing shear field in batches and stir continuously until the rare earth phosphors are evenly dispersed in the mixing container. S5. After the rare earth phosphor is evenly dispersed, add the remaining diluent and the weighed curing agent in sequence, and continue stirring until a homogenized luminescent paint is obtained.

2. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The base coating includes one or more of the following: primer, topcoat, and varnish, or a mixture thereof.

3. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The curing agent includes one or more of the following: acrylic curing agents, polyurethane curing agents, epoxy curing agents, and amino resin curing agents.

4. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The thinner includes one or more of the following: nitrocellulose lacquer thinner, chlorinated vinyl lacquer thinner, amino lacquer thinner, acrylic lacquer thinner, alkyd lacquer thinner, epoxy lacquer thinner, and polyurethane lacquer thinner.

5. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The rare earth phosphor includes one or more of the following: europium-doped strontium calcium sulfide, europium and dysprosium co-doped strontium aluminate, europium and dysprosium co-doped dicalcium silicate, europium and dysprosium co-doped strontium titanate, and europium and dysprosium co-doped magnesium strontium silicate.

6. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The mass ratio of the rare earth phosphor to the matrix coating is 1:(4~8).

7. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The stirring temperature is 0~30℃, the stirring speed is 150~1000rpm / min, the total stirring time is 5~30min, and the afterglow time of the luminescent paint reaches 3h.

8. The method for rapidly preparing multifunctional long-afterglow luminescent paint at room temperature according to claim 1, characterized in that, The preparation method of the multifunctional long afterglow luminescent paint is one or more of the following: mechanical stirring method, vacuum degassing machine method, three-dimensional mixing instrument method, high-speed disperser method, and high-shear homogenizer method.

9. The multifunctional long afterglow luminescent paint prepared by the preparation method according to any one of claims 1-8.

10. The application of the multifunctional long-afterglow luminescent paint prepared by the preparation method according to any one of claims 1-8 or the multifunctional long-afterglow luminescent paint according to claim 9 in the field of functional coatings technology.

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