Photonic crystal film capable of being cured at room temperature, preparation method and preparation equipment thereof

Abstract

The invention discloses a photonic crystal film capable of being cured at room temperature, the photonic crystal film is formed by curing core-shell nanoparticles at room temperature, and the core-shell nanoparticles are composed of polystyrene nanoparticles serving as a core layer and acrylate polymers serving as a shell layer. According to the photonic crystal film capable of being cured at room temperature, the preparation method and the preparation equipment thereof, the photonic crystal film has the characteristics of a photonic crystal periodic structure, compared with traditional colored paper, chemical dyes are not needed to dye the photonic crystal film in the preparation process, a dispersion medium of the emulsion is water, the photonic crystal film is environmentally friendly, traditional heating curing or ultraviolet curing is not needed, and the cost is low. System curing depends on shell layer melting in the solvent evaporation process to achieve the physical cross-linking effect, the hydrophilic property of an acrylate polymer in the system is utilized, the colored paper can be well attached to a substrate and is not prone to moving, and compared with traditional colored paper, the preparation method is simple, and cumbersome steps and large instruments are not needed.

Description

Technical Field

[0001] This invention belongs to the field of photonic crystal technology, specifically relating to a room-temperature curable photonic crystal thin film, its preparation method, and its preparation equipment. Background Technology

[0002] Photonic crystal thin films are artificially synthesized periodic dielectric structures composed of materials with different dielectric constants. Their constituent units are arranged periodically in a specific direction, corresponding to the wavelength of light. This periodic structure can generate photonic band gaps, meaning that light within a specific frequency range cannot propagate through them, thereby enabling effective manipulation of photons.

[0003] Colored paper is a type of paper that has been processed with special techniques to produce a specific color. As one of the most common materials in our daily lives, colored paper adds color to our daily routines. However, the use and emission of chemical dyes in the production of colored paper are accompanied by a series of ecological problems. Photonic crystal thin films, due to their unique periodic structure, can exhibit vibrant structural colors without the need for chemical dyes. After modification and optimization of the thin film, writing on it with water instead of a pen is easy to remove and can be recycled. It is expected to become a replacement for the next generation of new colored paper.

[0004] Currently, the weak interfacial forces between existing organic / inorganic nanoparticles pose a significant challenge to their self-assembly into large-area structural color carriers. While small-scale laboratory preparations can achieve localized ordering through precise control, the drawbacks of weak interfacial forces are amplified when scaled up to large areas. This results in poor structural uniformity, making it difficult to form uniform photonic crystal structures. Furthermore, the prepared carriers exhibit insufficient mechanical stability, are prone to breakage, and are susceptible to performance failure. Simultaneously, it is difficult to balance efficiency and quality.

[0005] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a room-temperature curable photonic crystal thin film, its preparation method, and its preparation equipment.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a room-temperature curable photonic crystal thin film, its preparation method and preparation equipment, which can solve the problem that the weak interfacial forces between existing organic / inorganic nanoparticles result in poor structural uniformity and insufficient mechanical stability when preparing structural color carriers over large areas, and it is also difficult to balance efficiency and quality.

[0008] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0009] A room-temperature curable photonic crystal film is provided, wherein the photonic crystal film is formed by curing core-shell nanoparticles at room temperature. The core-shell nanoparticles consist of polystyrene nanoparticles as the core layer and an acrylate polymer as the shell layer. The polystyrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene; 0.001-0.003 parts sodium dodecyl sulfonate; 10 parts potassium persulfate aqueous solution. The nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water; 2.5-3.5 parts n-butyl acrylate; 5.5-8.5 parts methyl methacrylate; 1.65-2.1 parts polyethylene glycol methacrylate; 50-80 parts ethylene glycol dimethacrylate.

[0010] In one or more embodiments of the present invention, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene; 0.003 parts sodium dodecyl sulfonate; 10 parts potassium persulfate aqueous solution, and the nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water; 2.5 parts n-butyl acrylate; 5.5 parts methyl methacrylate; 1.65 parts polyethylene glycol methacrylate; 50 parts ethylene glycol dimethacrylate.

[0011] In one or more embodiments of the present invention, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene; 0.002 parts sodium dodecyl sulfonate; 10 parts potassium persulfate aqueous solution, and the nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water; 3 parts n-butyl acrylate; 6.5 parts methyl methacrylate; 1.8 parts polyethylene glycol methacrylate; 60 parts ethylene glycol dimethacrylate.

[0012] In one or more embodiments of the present invention, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene; 0.001 parts sodium dodecyl sulfonate; 10 parts potassium persulfate aqueous solution, and the nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water; 3.5 parts n-butyl acrylate; 8.5 parts methyl methacrylate; 2.1 parts polyethylene glycol methacrylate; 80 parts ethylene glycol dimethacrylate.

[0013] A method for preparing a room-temperature curable photonic crystal thin film includes the following steps:

[0014] S1. Add styrene to a round-bottom three-necked flask containing 100 mL of ultrapure water, add sodium dodecyl sulfate while stirring at 500 rpm, and pre-emulsify at 50 °C for 30 min. During this process, nitrogen gas is continuously introduced to remove oxygen from the system to prevent oxygen-induced polymerization.

[0015] S2. Raise the system temperature to 70℃ and add 10mL of potassium persulfate aqueous solution (mass fraction of 10wt%) to initiate free radical polymerization. Start timing when the system gradually turns light blue and continue to purge nitrogen gas for the entire polymerization process for 5 hours.

[0016] S3. After polymerization, filter the impurities in the emulsion using a filter screen, then store it in a dialysis bag and soak it in ultrapure water for 5 days, changing the water every other day to remove the remaining monomers and oligomers, forming a polystyrene core emulsion, and measuring the particle size of the styrene nanoparticles in it.

[0017] S4. Set the oil bath temperature to 50℃ and the electromagnetic stirring speed to 600rpm. Mix ultrapure water, methyl methacrylate, n-butyl acrylate, polyethylene glycol methacrylate, and ethylene glycol dimethacrylate in a 250mL three-necked round-bottom flask for 30min. Then add the purified polystyrene core emulsion and continue mixing for 30min. Nitrogen gas needs to be continuously introduced during the mixing process to remove the oxygen remaining in the system.

[0018] S5. After polymerization is complete, filter the impurities in the emulsion using a filter screen, then store it in a dialysis bag and soak it in ultrapure water for 5 days, changing the water every other day to remove the remaining monomers and oligomers, finally obtaining a core-shell nanoparticle emulsion.

[0019] S6. After spreading the core-shell nanoparticle emulsion evenly on a glass slide, it can be solidified into a photonic crystal film after the solvent evaporates at room temperature.

[0020] In one or more embodiments of the present invention, the oil bath in S4 includes: an oil bath body on which a three-necked round-bottom flask body is disposed, and a stir bar is disposed inside the three-necked round-bottom flask body; a positioning and stirring mechanism is fixedly installed on the stir bar, the positioning and stirring mechanism including a centrifugal stirring component and a centrifugal turning component, the centrifugal stirring component being fixedly installed on the stir bar, and the centrifugal turning component being fixedly installed on the centrifugal stirring component.

[0021] In one or more embodiments of the present invention, the centrifugal agitation assembly includes: a centrifugal agitation drive rod, a centrifugal agitation driven rod, a centrifugal agitation positioning cover, multiple pairs of centrifugal agitation plates, a centrifugal agitation base, and a centrifugal agitation rotation spring. The centrifugal agitation drive rod is fixedly mounted on the stir bar; the centrifugal agitation driven rod is rotatably mounted on the outside of the centrifugal agitation drive rod; the centrifugal agitation positioning cover is mounted on the three-necked round-bottom flask body; multiple pairs of centrifugal agitation plates are disposed on both sides of the centrifugal agitation driven rod; the centrifugal agitation base is rotatably mounted inside the centrifugal agitation plates; and the centrifugal agitation rotation spring is installed between the centrifugal agitation plates and the centrifugal agitation base.

[0022] In one or more embodiments of the present invention, the centrifugal agitation driven rod passes through the centrifugal agitation positioning cover, a centrifugal agitation bearing is installed between the centrifugal agitation driven rod and the centrifugal agitation positioning cover, and the centrifugal agitation base passes through the centrifugal agitation centrifugal plate.

[0023] In one or more embodiments of the present invention, the centrifugal tilting assembly includes: a centrifugal tilting base, a centrifugal tilting rotating seat, a centrifugal tilting first gear, a centrifugal tilting second gear, a centrifugal tilting first pulley, a centrifugal tilting second pulley, and a centrifugal tilting belt. The centrifugal tilting base is fixedly installed on one side of the centrifugal agitation positioning cover; the centrifugal tilting rotating seat is rotatably installed inside the centrifugal tilting base; the centrifugal tilting first gear is fixedly installed on the centrifugal tilting rotating seat; the centrifugal tilting second gear is fixedly installed on the centrifugal agitation driven rod; the centrifugal tilting first pulley is fixedly installed at one end of the centrifugal tilting rotating seat; the centrifugal tilting second pulley is fixedly installed at one end of the centrifugal agitation transmission rod; and the centrifugal tilting belt is fixedly installed between the centrifugal tilting first pulley and the centrifugal tilting second pulley.

[0024] In one or more embodiments of the present invention, the centrifugal tilting turntable is disposed through the centrifugal tilting base, the centrifugal tilting first gear meshes with the centrifugal tilting second gear, and the centrifugal tilting belt is matched with the centrifugal tilting first pulley and the centrifugal tilting second pulley.

[0025] Compared with existing technologies, the room-temperature curable photonic crystal film, preparation method and preparation equipment of the present invention have the characteristics of a periodic structure of photonic crystals. Compared with traditional colored paper, the preparation process does not require chemical dyes for coloring, and the dispersion medium of the emulsion is water, which is more environmentally friendly. There is no need for traditional heating curing or ultraviolet curing. The curing of the system relies on the physical cross-linking effect of the shell melting during the solvent evaporation process. Utilizing the hydrophilicity of the acrylate polymer in the system, it can adhere well to the substrate and is not easy to move. Compared with traditional colored paper, the preparation method is simple and does not require complicated steps or large instruments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 Optical photographs of photonic crystal thin films configured with core-shell particles of different sizes in one embodiment of the present invention;

[0028] Figure 2The reflection spectra of photonic crystal thin films configured with core-shell particles of different sizes in one embodiment of the present invention;

[0029] Figure 3 This is a SEM image of a cross-linked core-shell particle array in one embodiment of the present invention;

[0030] Figure 4 This is a SEM image of a cross-linked core-shell particle array in one embodiment of the present invention;

[0031] Figure 5 This is the state of liquid water as ink on a photonic crystal thin film before writing, according to an embodiment of the present invention;

[0032] Figure 6 This is a first embodiment of the writing process on a photonic crystal thin film using liquid water as ink, according to an embodiment of the present invention.

[0033] Figure 7 This is a second embodiment of the writing process on a photonic crystal thin film using liquid water as ink, according to one embodiment of the present invention.

[0034] Figure 8 This is the form of a photonic crystal thin film after writing on it with liquid water as ink, erasing the ink marks, and drying, according to an embodiment of the present invention;

[0035] Figure 9 This is a partial three-dimensional cross-sectional view of a room-temperature curable photonic crystal thin film fabrication device according to an embodiment of the present invention;

[0036] Figure 10 for Figure 9 Schematic diagram of the structure at point A in the middle;

[0037] Figure 11 for Figure 9 Schematic diagram of the structure at point B;

[0038] Figure 12 This is a perspective view of a room-temperature curable photonic crystal thin film fabrication apparatus according to an embodiment of the present invention.

[0039] Explanation of key figure labels:

[0040] 1-Oil bath body, 11-Three-necked round-bottom flask body, 12-Stirring bar, 2-Positioning and stirring mechanism, 21-Centrifugal stirring assembly, 211-Centrifugal stirring transmission rod, 212-Centrifugal stirring driven rod, 213-Centrifugal stirring positioning cover, 214-Centrifugal stirring plate, 215-Centrifugal stirring base, 216-Centrifugal stirring rotary spring, 217-Centrifugal stirring bearing, 22-Centrifugal tilting assembly, 221-Centrifugal tilting base, 222-Centrifugal tilting rotating seat, 223-Centrifugal tilting first gear, 224-Centrifugal tilting second gear, 225-Centrifugal tilting first pulley, 226-Centrifugal tilting second pulley, 227-Centrifugal tilting belt. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0042] like Figures 1 to 8 As shown, in one embodiment of the present invention, a room-temperature curable photonic crystal film is formed by curing core-shell nanoparticles at room temperature. The core-shell nanoparticles consist of polystyrene nanoparticles as the core layer and an acrylate polymer as the shell layer. The polystyrene nanoparticles include the following raw materials in parts by weight: 10 parts styrene, 0.001-0.003 parts sodium dodecyl sulfonate, and 10 parts potassium persulfate aqueous solution. The nanoparticle shell layer includes the following raw materials in parts by weight: 55 parts ultrapure water, 2.5-3.5 parts n-butyl acrylate, 5.5-8.5 parts methyl methacrylate, 1.65-2.1 parts polyethylene glycol methacrylate, and 50-80 parts ethylene glycol dimethacrylate.

[0043] like Figures 1 to 8 As shown, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene, 0.003 parts sodium dodecyl sulfonate, and 10 parts potassium persulfate aqueous solution. The nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water, 2.5 parts n-butyl acrylate, 5.5 parts methyl methacrylate, 1.65 parts polyethylene glycol methacrylate, and 50 parts ethylene glycol dimethacrylate.

[0044] like Figures 1 to 8As shown, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene, 0.002 parts sodium dodecyl sulfonate, and 10 parts potassium persulfate aqueous solution. The nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water, 3 parts n-butyl acrylate, 6.5 parts methyl methacrylate, 1.8 parts polyethylene glycol methacrylate, and 60 parts ethylene glycol dimethacrylate.

[0045] like Figures 1 to 8 As shown, the styrene nanoparticles comprise the following raw materials in parts by weight: 10 parts styrene, 0.001 parts sodium dodecyl sulfonate, and 10 parts potassium persulfate aqueous solution. The nanoparticle shell comprises the following raw materials in parts by weight: 55 parts ultrapure water, 3.5 parts n-butyl acrylate, 8.5 parts methyl methacrylate, 2.1 parts polyethylene glycol methacrylate, and 80 parts ethylene glycol dimethacrylate.

[0046] like Figures 1 to 8 As shown, a method for preparing a room-temperature curable photonic crystal thin film includes the following steps:

[0047] S1. Add styrene to a round-bottom three-necked flask containing 100 mL of ultrapure water, add sodium dodecyl sulfate while stirring at 500 rpm, and pre-emulsify at 50 °C for 30 min. During this process, nitrogen gas is continuously introduced to remove oxygen from the system and prevent oxygen-induced polymerization.

[0048] S2. Raise the system temperature to 70℃ and add 10mL of potassium persulfate aqueous solution with a mass fraction of 10wt% to initiate free radical polymerization. Start timing when the system gradually turns light blue and continue to purge nitrogen gas. The entire polymerization process lasts for 5 hours.

[0049] S3. After polymerization, filter the impurities in the emulsion using a filter screen, then store it in a dialysis bag and soak it in ultrapure water for 5 days, changing the water every other day to remove the remaining monomers and oligomers, forming a polystyrene core emulsion, and measuring the particle size of the styrene nanoparticles in it.

[0050] S4. Set the oil bath temperature to 50℃ and the electromagnetic stirring speed to 600rpm. Mix ultrapure water, methyl methacrylate, n-butyl acrylate, polyethylene glycol methacrylate, and ethylene glycol dimethacrylate in a 250mL three-necked round-bottom flask for 30min. Then add the purified polystyrene core emulsion and continue mixing for 30min. Nitrogen gas needs to be continuously introduced during the mixing process to remove the oxygen remaining in the system.

[0051] S5. After complete polymerization, filter the emulsion to remove impurities, then store it in a dialysis bag and soak it in ultrapure water for 5 days, changing the water every other day to remove the remaining monomers and oligomers, finally obtaining a core-shell nanoparticle emulsion.

[0052] S6. After spreading the core-shell nanoparticle emulsion evenly on a glass slide, it can be solidified into a photonic crystal film after the solvent evaporates at room temperature.

[0053] like Figures 1 to 8 As shown, the preparation of precursor core-layer polystyrene particles was as follows: 10g of styrene was added to a round-bottom three-necked flask containing 100mL of ultrapure water. 0.03g of sodium dodecyl sulfonate was added while stirring at 500rpm, and pre-emulsification was carried out at 50℃ for 30min. During this process, nitrogen gas was continuously purged to remove oxygen from the system and prevent oxygen-induced polymerization. Then, the system temperature was raised to 70℃, and 10mL of 10wt% potassium persulfate aqueous solution was added to initiate free radical polymerization. Timing began when the system gradually turned pale blue, and the entire polymerization process lasted for 5h. After polymerization, the polystyrene particle size was measured to be 180nm. The particles were then stored in a dialysis bag and soaked in ultrapure water for 5 days to remove residual monomers and oligomers. In the subsequent reaction, the oil bath temperature was set at 50℃, and the electromagnetic stirring speed was 600 rpm. 55 mL of ultrapure water, 2.5 mL of methyl methacrylate, 5.5 mL of n-butyl acrylate, 1.65 mL of polyethylene glycol methacrylate, and 50 μL of ethylene glycol dimethacrylate were thoroughly mixed in a 250 mL three-necked round-bottom flask for 30 min. Then, purified polystyrene core emulsion was added, and mixing continued for another 30 min. Nitrogen gas was continuously purged during mixing to remove any remaining oxygen. After the oil bath temperature reached 75℃, 10 mL of 10 wt% potassium persulfate aqueous solution and 0.03 g of sodium dodecyl sulfate were added to initiate free radical polymerization. After 5 h of reaction, core-shell nanoparticles with a particle size of 234 nm were obtained, with a mass fraction of approximately 15%. Figure 1 The image shows an optical photograph and its reflectance spectrum of the obtained smart ink. As can be seen from the image, the ink made from 234nm colloidal particles has a reflectance peak at 550nm, exhibiting a green color.

[0054] like Figures 1 to 8As shown, the preparation of precursor core-layer polystyrene particles was as follows: 10g of styrene was added to a round-bottom three-necked flask containing 100mL of ultrapure water. 0.02g of sodium dodecyl sulfonate was added while stirring at 500rpm, and pre-emulsification was carried out at 50℃ for 30min. During this process, nitrogen gas was continuously purged to remove oxygen from the system and prevent oxygen-induced polymerization. Then, the system temperature was raised to 70℃, and 10mL of potassium persulfate aqueous solution (10wt%) was added to initiate free radical polymerization. Timing began when the system gradually turned pale blue, and the entire polymerization process lasted for 5h. After polymerization, the polystyrene particle size was measured to be 195nm. The particles were then stored in a dialysis bag and soaked in ultrapure water for 5 days to remove residual monomers and oligomers. In the subsequent reaction, the oil bath temperature was set at 50℃, and the electromagnetic stirring speed was 600 rpm. 55 mL of ultrapure water, 3.0 mL of methyl methacrylate, 6.5 mL of n-butyl acrylate, 1.8 mL of polyethylene glycol methacrylate, and 60 μL of ethylene glycol dimethacrylate were thoroughly mixed in a 250 mL three-necked round-bottom flask for 30 min. Then, purified polystyrene core emulsion was added, and mixing continued for another 30 min. Nitrogen gas was continuously purged during mixing to remove any remaining oxygen. After the oil bath temperature reached 75℃, 10 mL of 10 wt% potassium persulfate aqueous solution and 0.02 g of sodium dodecyl sulfate were added to initiate free radical polymerization. After 5 h of reaction, core-shell nanoparticles with a particle size of 253 nm were obtained, with a mass fraction of approximately 15%. Figure 1 The image shows an optical photograph and its reflectance spectrum of the obtained smart ink. As can be seen from the image, the ink made from 253nm colloidal particles has a reflectance peak at 593nm, exhibiting a yellow color.

[0055] like Figures 1 to 8As shown, the preparation of precursor core-layer polystyrene particles was as follows: 10g of styrene was added to a round-bottom three-necked flask containing 100mL of ultrapure water. 0.01g of sodium dodecyl sulfonate was added while stirring at 500rpm, and pre-emulsification was carried out at 50℃ for 30min. During this process, nitrogen gas was continuously purged to remove oxygen from the system and prevent oxygen-induced polymerization. Then, the system temperature was raised to 70℃, and 10mL of potassium persulfate aqueous solution (10wt%) was added to initiate free radical polymerization. Timing began when the system gradually turned pale blue, and the entire polymerization process lasted for 5h. After polymerization, the polystyrene particle size was measured to be 210nm. The particles were then stored in a dialysis bag and soaked in ultrapure water for 5 days to remove residual monomers and oligomers. In the subsequent reaction, the oil bath temperature was set at 50℃, and the electromagnetic stirring speed was 600 rpm. 55 mL of ultrapure water, 3.5 mL of methyl methacrylate, 8.5 mL of n-butyl acrylate, 2.1 mL of polyethylene glycol methacrylate, and 80 μL of ethylene glycol dimethacrylate were thoroughly mixed in a 250 mL three-necked round-bottom flask for 30 min. Then, purified polystyrene core emulsion was added, and mixing continued for another 30 min. Nitrogen gas was continuously purged during mixing to remove any remaining oxygen. After the oil bath temperature reached 75℃, 10 mL of 10 wt% potassium persulfate aqueous solution and 0.02 g of sodium dodecyl sulfate were added to initiate free radical polymerization. After 5 h of reaction, core-shell nanoparticles with a particle size of 261 nm were obtained, with a mass fraction of approximately 15%. Figure 1 The image shows an optical photograph and its reflection spectrum of the obtained smart ink. As can be seen from the image, the ink made from 261nm colloidal particles has a reflection peak at 646nm, exhibiting a red color.

[0056] like Figures 1 to 12 As shown, the oil bath in S4 includes: an oil bath body 1, on which a three-necked round-bottom flask body 11 is mounted, and a stir bar 12 is disposed inside the three-necked round-bottom flask body 11. A positioning and stirring mechanism 2 is fixedly mounted on the stir bar 12. The positioning and stirring mechanism 2 includes a centrifugal stirring component 21 and a centrifugal tilting component 22. The centrifugal stirring component 21 is fixedly mounted on the stir bar 12, and the centrifugal tilting component 22 is fixedly mounted on the centrifugal stirring component 21.

[0057] The method of using the room temperature curable photonic crystal thin film preparation equipment is as follows: Place the stir bar 12 inside the three-necked round bottom flask body 11, and fix the stir bar 12 by the centrifugal stirring assembly 21. When the stir bar 12 rotates, the centrifugal stirring assembly 21 can swing and stir the liquid in the three-necked round bottom flask body 11 by centrifugal force. At the same time, the centrifugal reversing assembly 22 can reverse the rotation direction of the stir bar 12 and the centrifugal stirring driven rod 212, which can improve the stirring efficiency.

[0058] like Figures 9 to 12As shown, the centrifugal agitation assembly 21 includes: a centrifugal agitation drive rod 211, a centrifugal agitation driven rod 212, a centrifugal agitation positioning cover 213, multiple pairs of centrifugal agitation plates 214, a centrifugal agitation base 215, and a centrifugal agitation rotation spring 216. The centrifugal agitation drive rod 211 is fixedly installed on the stirrer 12. The centrifugal agitation drive rod 211 can be sleeved on the stirrer 12, and can transmit the rotation of the stirrer 12 to the centrifugal tilting assembly 22, thus achieving the function of rotation. The centrifugal stirring driven rod 212 is rotatably mounted on the outside of the centrifugal stirring transmission rod 211. The centrifugal stirring driven rod 212 can be rotated by the centrifugal tilting assembly 22. While stirring the liquid in the three-necked round-bottom flask body 11, the centrifugal force can also be used to throw the centrifugal stirring plate 214 open. After the centrifugal stirring plate 214 is opened, it stirs the liquid, which improves the uniformity of heating of the liquid in the three-necked round-bottom flask body 11. This allows the temperature of the liquid in the three-necked round-bottom flask body 11 to rise evenly after heating. A centrifugal stirring positioning cover 213 is installed on the three-necked round-bottom flask body 11. The centrifugal stirring positioning cover 213 can position the centrifugal stirring drive rod 211 and the centrifugal stirring driven rod 212, improving their stability, reducing the probability of tilting, and enhancing their balance. Multiple pairs of centrifugal stirring plates 214 are arranged on both sides of the centrifugal stirring driven rod 212. The centrifugal stirring plates 214 can be opened under centrifugal force, allowing the liquid to be stirred after opening. The centrifugal agitation base 215 is rotatably mounted inside the centrifugal agitation plate 214, which can fix the centrifugal agitation plate 214 on the centrifugal agitation driven rod 212. It can support the rotation of the centrifugal agitation base 215 and provide a corresponding axis for the rotation of the centrifugal agitation base 215. The centrifugal agitation rotation spring 216 is installed between the centrifugal agitation plate 214 and the centrifugal agitation base 215. It can pull the centrifugal agitation plate 214. When the centrifugal agitation driven rod 212 is not rotating and the centrifugal force is gone, the centrifugal agitation plate 214 can be retracted, which facilitates the removal of the positioning agitation mechanism 2.

[0059] like Figures 9 to 12 As shown, the centrifugal agitation driven rod 212 is installed through the centrifugal agitation positioning cover 213. A centrifugal agitation bearing 217 is installed between the centrifugal agitation driven rod 212 and the centrifugal agitation positioning cover 213, which reduces the friction between the centrifugal agitation driven rod 212 and the centrifugal agitation positioning cover 213 and improves the service life of the centrifugal agitation driven rod 212 and the centrifugal agitation positioning cover 213. The centrifugal agitation base 215 is installed through the centrifugal agitation centrifugal plate 214.

[0060] like Figures 9 to 10 As shown, the centrifugal tilting assembly 22 includes: a centrifugal tilting base 221, a centrifugal tilting rotor 222, a centrifugal tilting first gear 223, a centrifugal tilting second gear 224, a centrifugal tilting first pulley 225, a centrifugal tilting second pulley 226, and a centrifugal tilting belt 227. The centrifugal tilting base 221 is fixedly installed on one side of the centrifugal agitation positioning cover 213. The centrifugal tilting base 221 can fix the centrifugal tilting rotor 222, improving the stability of the centrifugal tilting rotor 222 and reducing the probability of tilting during rotation. The centrifugal tilting rotor 222 is rotatably installed within the centrifugal tilting base 221. The centrifugal tilting rotor 222 can fix the centrifugal tilting first gear 223 and the centrifugal tilting first pulley 225, enabling them to rotate synchronously. The first centrifugal tilting gear 223 is fixedly mounted on the centrifugal tilting rotor 222. The first centrifugal tilting gear 223 drives the rotation of the second centrifugal tilting gear 224, and its rotation can be controlled while the first gear 223 is rotating. The second centrifugal tilting gear 224 is fixedly mounted on the centrifugal agitation driven rod 212, and its rotation can be controlled, allowing for more stable rotation of the driven rod 212. The first centrifugal tilting pulley 225 is fixedly mounted on one end of the centrifugal tilting rotor 222, and its rotation is driven by the second centrifugal tilting pulley 226. The second centrifugal tilting pulley 226 is fixedly mounted on one end of the centrifugal agitation transmission rod 211, and its rotation is driven by the centrifugal agitation transmission rod 211, which in turn drives the first centrifugal tilting pulley 225 to rotate. The centrifugal tilting belt 227 is fixedly installed between the first centrifugal tilting pulley 225 and the second centrifugal tilting pulley 226.

[0061] like Figures 9 to 11 As shown, the centrifugal tilting turntable 222 is disposed through the centrifugal tilting base 221, the centrifugal tilting first gear 223 meshes with the centrifugal tilting second gear 224, and the centrifugal tilting belt 227 is matched with the centrifugal tilting first pulley 225 and the centrifugal tilting second pulley 226.

[0062] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A room temperature curable photonic crystal film, characterized in that, The photonic crystal film is solidified at room temperature by core-shell nanoparticles, the core-shell nanoparticles are composed of polystyrene nanoparticles as core layer and acrylate polymer as shell layer, the polystyrene nanoparticles include the following raw materials in parts by weight: 10 parts of styrene; 0.001-0.003 parts of sodium dodecyl sulfonate; 10 parts of potassium persulfate aqueous solution, the nanoparticle shell layer includes the following raw materials in parts by weight: 55 parts of ultrapure water; 2.5-3.5 parts of n-butyl acrylate; 5.5-8.5 parts of methyl methacrylate; 1.65-2.1 parts of polyethylene glycol methacrylate; 50-80 parts of ethylene glycol dimethacrylate.

2. The room temperature vulcanizable photonic crystal film of claim 1, wherein, The polystyrene nanoparticles include the following raw materials in parts by weight: 10 parts of styrene; 0.003 parts of sodium dodecyl sulfonate; 10 parts of potassium persulfate aqueous solution, the nanoparticle shell layer includes the following raw materials in parts by weight: 55 parts of ultrapure water; 2.5 parts of n-butyl acrylate; 5.5 parts of methyl methacrylate; 1.65 parts of polyethylene glycol methacrylate; 50 parts of ethylene glycol dimethacrylate.

3. The room temperature vulcanizable photonic crystal film of claim 1, wherein, The polystyrene nanoparticles include the following raw materials in parts by weight: 10 parts of styrene; 0.002 parts of sodium dodecyl sulfonate; 10 parts of potassium persulfate aqueous solution, the nanoparticle shell layer includes the following raw materials in parts by weight: 55 parts of ultrapure water; 3 parts of n-butyl acrylate; 6.5 parts of methyl methacrylate; 1.8 parts of polyethylene glycol methacrylate; 60 parts of ethylene glycol dimethacrylate.

4. The room temperature vulcanizable photonic crystal film of claim 1, wherein, The polystyrene nanoparticles include the following raw materials in parts by weight: 10 parts of styrene; 0.001 parts of sodium dodecyl sulfonate; 10 parts of potassium persulfate aqueous solution, the nanoparticle shell layer includes the following raw materials in parts by weight: 55 parts of ultrapure water; 3.5 parts of n-butyl acrylate; 8.5 parts of methyl methacrylate; 2.1 parts of polyethylene glycol methacrylate; 80 parts of ethylene glycol dimethacrylate.

5. A method for producing the room temperature-curable photonic crystal film according to any one of claims 1 to 4, characterized by The method comprises the following steps: S1, polystyrene is added to a round-bottom three-neck flask containing 100 mL of ultrapure water, sodium dodecyl sulfate is added at a stirring speed of 500 rpm, and pre-emulsification is carried out at 50°C for 30 min, and nitrogen is continuously introduced during the process to remove oxygen in the system to prevent oxygen inhibition; S2, the temperature of the system is raised to 70°C, 10 mL of potassium persulfate aqueous solution (10wt%) is added to initiate free radical polymerization, and nitrogen is continuously introduced during the whole polymerization process for 5 h; S3, after the polymerization is completed, the impurities in the emulsion are filtered by using a filter screen, and then stored in a dialysis bag, soaked in ultrapure water for 5 days, and the water is changed every other day to remove the remaining monomers and oligomers, to form a polystyrene core emulsion, and the particle size of the polystyrene nanoparticles is measured; S4, set the oil bath temperature of the oil bath pot to 50℃, the electromagnetic stirring rate to 600 rpm, mix the ultrapure water, methyl methacrylate, n-butyl acrylate, polyethylene glycol methacrylate, ethylene glycol dimethacrylate in a 250 mL three-necked round-bottom flask for 30 min, then add the purified polystyrene core emulsion and continue mixing for 30 min, and continuously introduce nitrogen during the mixing process to remove the oxygen remaining in the system; S5, after polymerization, filter the impurities in the emulsion using a filter screen, then store it in a dialysis bag, soak it in ultrapure water for 5 days, and change the water every other day to remove the remaining monomers and oligomers, and finally obtain a core-shell nanoparticle emulsion; S6, take the core-shell nanoparticle emulsion and evenly spread it on a glass sheet, then wait for the solvent to evaporate at room temperature to solidify into a photonic crystal film.

6. The apparatus for preparing a room temperature vulcanizable photonic crystal thin film according to claim 5, wherein The oil bath pot in S4 comprises: An oil bath pot body, a three-necked round-bottom flask body is arranged on the oil bath pot body, and a stirring rod is arranged in the three-necked round-bottom flask body; A positioning stirring mechanism is fixedly installed on the stirring rod, and the positioning stirring mechanism comprises a centrifugal stirring assembly and a centrifugal overturning assembly, the centrifugal stirring assembly is fixedly installed on the stirring rod, and the centrifugal overturning assembly is fixedly installed on the centrifugal stirring assembly.

7. The apparatus for preparing a room temperature vulcanizable photonic crystal thin film according to claim 6, wherein The centrifugal stirring assembly comprises: A centrifugal stirring transmission rod is fixedly installed on the stirring rod; A centrifugal stirring driven rod is rotatably installed on the outside of the centrifugal stirring transmission rod; A centrifugal stirring positioning cover is installed on the three-necked round-bottom flask body; A plurality of pairs of centrifugal stirring centrifugal plates are arranged on both sides of the centrifugal stirring driven rod; A centrifugal stirring base is rotatably installed in the centrifugal stirring centrifugal plate; A centrifugal stirring rotation spring is installed between the centrifugal stirring centrifugal plate and the centrifugal stirring base.

8. The apparatus for preparing a room temperature vulcanizable photonic crystal thin film according to claim 7, wherein The centrifugal stirring driven rod penetrates the centrifugal stirring positioning cover, a centrifugal stirring bearing is installed between the centrifugal stirring driven rod and the centrifugal stirring positioning cover, and the centrifugal stirring base penetrates the centrifugal stirring centrifugal plate.

9. The apparatus for preparing a room temperature vulcanizable photonic crystal thin film according to claim 7, wherein The centrifugal overturning assembly comprises: A centrifugal overturning base is fixedly installed on one side of the centrifugal stirring positioning cover; A centrifugal overturning rotating seat is rotatably installed in the centrifugal overturning base; A centrifugal overturning first gear is fixedly installed on the centrifugal overturning rotating seat; A centrifugal overturning second gear is fixedly installed on the centrifugal stirring driven rod; A centrifugal overturning first friction wheel is fixedly installed on one end of the centrifugal overturning rotating seat; A centrifugal overturning second friction wheel is fixedly installed on one end of the centrifugal stirring transmission rod; A centrifugal overturning belt is fixedly installed between the centrifugal overturning first friction wheel and the centrifugal overturning second friction wheel.

10. The apparatus for preparing a room temperature vulcanizable photonic crystal thin film according to claim 9, wherein The centrifugal overturning rotating seat penetrates the centrifugal overturning base, the centrifugal overturning first gear is engaged with the centrifugal overturning second gear, and the centrifugal overturning belt matches the centrifugal overturning first friction wheel and the centrifugal overturning second friction wheel.

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