A nano-zinc oxide in-situ polymerized rayleigh scattering PMMA light guide plate and a preparation method thereof

Abstract

The application relates to the field of lamp lighting materials, in particular to a nano ZnO in-situ polymerized Rayleigh scattering PMMA light guide plate and a preparation method thereof. The preparation raw materials of the Rayleigh scattering PMMA light guide plate comprise 10-30 parts of MMA monomers, 0.1-0.3 parts of an initiator, 0.1-1 parts of modified nano ZnO particle dispersion liquid, 0.1-0.2 parts of an antioxidant and 0.01-0.1 parts of a light stabilizer according to mass fractions, wherein the preparation raw materials of the wet-state modified nano ZnO particle dispersion liquid comprise a ZnO precursor, a silane coupling agent, an alkali and a solvent. The Rayleigh scattering PMMA light guide plate provided by the application has natural light illumination characteristics and has a wide application prospect in the optical field.

Description

Technical Field

[0001] This invention relates to the field of lighting materials, specifically to a Rayleigh scattering PMMA light guide plate produced by in-situ polymerization of nano-ZnO and its preparation method. Background Technology

[0002] Light, as an indispensable element in human life, significantly impacts people's mental state and psychological well-being through the lighting environment it creates. In production, work, and study settings, a high-quality lighting environment can invigorate the spirit and help improve work efficiency and product quality. In public places such as rest and entertainment areas, a suitable lighting environment can create a comfortable, elegant, lively, or solemn atmosphere to meet the needs of different scenarios. Therefore, creating an ideal lighting environment has significant practical implications.

[0003] Rayleigh scattering light guide plates, as a novel optical component, demonstrate broad application prospects and high commercial value due to their unique technological advantages. Their core technology utilizes the Rayleigh scattering effect generated by nanoparticles in a transparent polymer sheet. Shorter wavelength blue-violet light is gradually scattered in various directions within the light guide plate, thus permeating the entire plate and simulating natural sunlight to recreate the visual effect of a clear blue sky. By simulating natural light through this light guide plate, a more realistic and comfortable lighting experience can be provided for indoor spaces, showing significant application potential in various lighting devices such as blue sky lamps and flat panel display backlight modules.

[0004] However, current Rayleigh scattering light guide plate fabrication technology still has significant shortcomings, hindering its further development and promotion. Existing fabrication processes are relatively cumbersome, and a key challenge lies in the poor uniformity of nanoparticle dispersion within the transparent polymer. Because nanoparticles are prone to aggregation, they cannot achieve uniform dispersion within the transparent polymer matrix. This not only reduces the light guide plate's transmittance but also results in a less pronounced blue effect, mimicking a clear blue sky, severely impacting the optical performance and user experience. Therefore, a new fabrication method is urgently needed to address the issues of uneven nanoparticle dispersion and complex processes, thereby promoting the optimization and upgrading of Rayleigh scattering light guide plate technology. Summary of the Invention

[0005] To address the aforementioned technical problems, the first aspect of this invention provides a Rayleigh scattering PMMA (polymethyl methacrylate) light guide plate produced by in-situ polymerization of nano-ZnO. The raw materials for its preparation, by mass, include 10-30 parts MMA (methyl methacrylate) monomer, 0.1-0.3 parts initiator, 0.1-1 parts modified nano-ZnO particle dispersion, 0.1-0.2 parts antioxidant, and 0.01-0.1 parts light stabilizer, wherein the modified nano-ZnO particles have a particle size of 50-200 nm.

[0006] This invention addresses the problem of high surface energy leading to easy aggregation of nanoparticles and uneven dispersion in PMMA matrices, thus affecting optical performance. It prepares modified ZnO nanoparticles with a particle size of 50-200 nm, combining solvent exchange and in-situ polymerization processes. Furthermore, by limiting the addition amount of modified ZnO nanoparticle dispersion to 0.1-1 parts, the agglomeration forces between particles are effectively reduced. This addresses the dispersion challenges of ZnO nanoparticles through particle size control, surface modification, and dosage regulation. Simultaneously, it addresses the problem of excessive nanoparticle addition causing a significant decrease in light transmittance in existing technologies. The invention precisely limits the basic dosage of MMA monomer to 10-30 parts, combined with 0.1-1 parts of modified nano-ZnO particle dispersion. By optimizing the proportion of each component, performance imbalance is avoided, and the optimal balance between light transmittance and scattering effect is achieved. In response to the stability problem of light guide plates being susceptible to oxidative degradation, yellowing, and optical performance degradation due to light and high temperature during long-term use, the invention limits the addition range of antioxidant to 0.1-0.2 parts and light stabilizer to 0.01-0.1 parts. The two work synergistically to inhibit polymer oxidative aging and resist ultraviolet corrosion, thereby improving the long-term stability of the light guide plate.

[0007] The wet modified nano-ZnO particle dispersion selected in this invention is not a conventional ZnO suspension, but a stable system formed by the hydrolysis of ZnO precursor and modification with a silane coupling agent. Simultaneously, due to the MMA solvent exchange treatment step, the modified nano-ZnO particle dispersion is a uniformly dispersed wet system with modified nano-ZnO particles as Rayleigh scattering centers and MMA liquid as the solvent. MMA solvent molecules form a steric hindrance layer on the particle surface, further preventing contact aggregation between particles. This ensures that the particles in the modified nano-ZnO particle dispersion with MMA as the solvent remain monodisperse and low-agglomeration in the 50-200 nm range during the in-situ polymerization of MMA monomers. The resulting PMMA light guide plate contains no agglomerated large particles and can form dense and uniform Rayleigh scattering centers, achieving high transmittance and Rayleigh scattering effects.

[0008] As an feasible example, the raw materials for preparing the modified nano-ZnO particle dispersion include ZnO precursor, silane coupling agent, alkali and solvent.

[0009] Furthermore, the ZnO precursor includes one of zinc acetate dihydrate, zinc nitrate hexahydrate, zinc acetate, or zinc acetylacetonate.

[0010] Furthermore, the alkali includes an aqueous solution of NaOH or an aqueous solution of KOH.

[0011] Furthermore, the solvents include water and anhydrous ethanol.

[0012] Furthermore, the silane coupling agent includes one of KH-550 (γ-aminopropyltriethoxysilane), KH-560 (γ-glycidoxypropyltrimethoxysilane), KH-570 (γ-methacryloyloxypropyltrimethoxysilane), KH-580 (γ-mercaptopropyltrimethoxysilane), or A-1160 (γ-ureapropyltriethoxysilane).

[0013] As an implementable example, the preparation method of the modified nano-ZnO particle dispersion includes: A solvent was added to the ZnO precursor, and the solution was dissolved by ultrasonication to obtain a ZnO precursor solution. Then, an alkali was added to adjust the pH of the system to 9-12 to obtain a ZnO particle dispersion. Then, a silane coupling agent is added and reacted, centrifuged, and solvent exchange is performed using MMA to obtain a modified nano-ZnO particle dispersion containing modified nano-ZnO particles.

[0014] Due to their high surface energy, nano-ZnO particles are prone to aggregation. Direct addition can lead to uneven dispersion within the MMA monomer, forming large aggregates that cause localized shading, reduced light transmittance, and uneven scattering in the light guide plate. However, the modified nano-ZnO particle dispersion, added in a wet state, significantly improves the uniformity of ZnO particle dispersion in PMMA, ensuring consistent overall optical performance of the light guide plate. This maintains both high light transmittance and uniform Rayleigh scattering.

[0015] As an example of implementation, the initiator includes peroxide initiators or azo initiators.

[0016] Furthermore, the peroxide initiators include BPO (benzoyl peroxide), dilauroyl peroxide, diacetyl peroxide, dipropionyl peroxide, dibutyryl peroxide, di(2,4-dichlorobenzoyl peroxide), di(o-methylbenzoyl peroxide), di(p-chlorobenzoyl peroxide), tert-butyl peroxide, tert-butyl peracetate, tert-butyl perpentanoate, tert-butyl peroxide-2-ethylhexanoate, tert-butyl peroxide-isobutyrate, tert-butyl peroxide-3,5,5-trimethylhexanoate, tert-butyl peroxide-neodecanate, di-tert-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5- Dimethyl-2,5-di(tert-butylperoxy)hexyne-3, di(1-hydroxycyclohexyl) peroxide, methyl ethyl ketone peroxide, diisopropyl peroxide dicarbonate, dicyclohexyl peroxide dicarbonate, di(2-ethylhexyl) peroxide dicarbonate, di(4-tert-butylcyclohexyl) peroxide dicarbonate, dimyristyl peroxide dicarbonate, tert-butyl hydroperoxide, cumene hydroperoxide, p-menthol hydroperoxide, pinane hydroperoxide, cyclohexyl hydroperoxide, ammonium persulfate, potassium persulfate, sodium persulfate, cyclohexanone peroxide, 1,1-di(tert-butylperoxy)cyclohexane or 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane, one or more of these.

[0017] As an implementable example, the azo initiator includes one of azobisisobutyronitrile, azobisisoheptanenitrile, azobis(2-methylbutyronitrile), azobis(2-phenylpropionitrile), azobis(cyclohexaneformitrile), dimethyl azobisisobutyrate, azobis(2,4,4-trimethylpentanitrile), azobis(1-phenylacetonitrile), azobis(2-isopropyl-2-propionitrile), azobis(4-cyanopentanoic acid), azobis(2-amidinepropane) hydrochloride, azobis(2-methyl-N-(2-hydroxyethyl)propionamide), azobis(N,N'-dimethyleneisobutyramidine) hydrochloride, azobis(2-carboxymethyl-2-propionitrile), or azobis(2-sulfoethyl-2-propionitrile) sodium salt.

[0018] As an implementable example, the antioxidant includes at least one of hindered phenolic antioxidants, phosphite antioxidants, hindered amine antioxidants, and thioester antioxidants.

[0019] Furthermore, the grades of the hindered phenolic antioxidants include one or more of antioxidant 1010, antioxidant 1076, antioxidant 2246, or antioxidant BHT.

[0020] Furthermore, the phosphite antioxidants include monophosphite antioxidants or diphosphite antioxidants.

[0021] Furthermore, the grades of the monophosphite antioxidants include antioxidant 168 or antioxidant TPP.

[0022] Furthermore, the grades of the bisphosphite antioxidants include one or more of antioxidant 626, antioxidant 618, antioxidant P-EPQ, or antioxidant AS-4500.

[0023] Furthermore, the hindered amine antioxidants include one or more of the following grades: antioxidant 944, antioxidant 770, antioxidant 711, antioxidant 622, antioxidant 783, antioxidant 292, antioxidant 123, or antioxidant 2020.

[0024] Furthermore, the grades of the sulfur ester antioxidants include one or more of antioxidant 636, antioxidant 412S, antioxidant DLTP, antioxidant DSTDP, or antioxidant DMTDP.

[0025] As an example of an implementable method, the light stabilizer includes one or more of Tinuvin 1130, Tinuvin 477, Tinuvin 329, Tinuvin 571, and Tinuvin 234.

[0026] A second aspect of this invention provides a method for preparing a Rayleigh scattering PMMA light guide plate synthesized in situ with nano-ZnO, comprising the following steps: Mix MMA monomer, modified nano-ZnO particle dispersion, antioxidant and light stabilizer, add initiator, and polymerize in situ at 65-80℃. Then remove air bubbles, pour into a mold, and polymerize at 50-60℃ for 24-48 hours to obtain Rayleigh scattering PMMA light guide plate.

[0027] As an example of implementation, the thickness of the Rayleigh scattering PMMA light guide plate is 2-5 mm.

[0028] Beneficial effects (i) This invention modifies the surface of nano-ZnO particles by using a silane coupling agent and combines it with an in-situ polymerization process. At the same time, MMA is used in the preparation of the modified nano-ZnO particle dispersion for solvent exchange treatment. The wet nanoparticles can effectively solve the problem of easy agglomeration of nanoparticles, significantly improve their dispersion uniformity in the PMMA matrix, and avoid optical defects caused by particle aggregation.

[0029] (ii) In this invention, the nano-ZnO particle size can be precisely controlled to 50-200nm through the hydrolysis preparation process of ZnO precursor. The particle size meets the requirements of Rayleigh scattering effect, which can efficiently scatter short-wavelength blue-violet light, so that the light guide plate can simulate the effect of natural sunlight. At the same time, it takes into account high light transmittance and uniform scattering characteristics, providing a real and comfortable natural light lighting experience for indoor use.

[0030] (III) By limiting the mass of the modified nanoparticle dispersion to 0.1 to 1 part and adding the modified nano-ZnO particle dispersion in wet form, the nanoparticles in the light guide plate can be more uniformly dispersed. At the same time, the modified nano-ZnO particle dispersion, which has undergone solvent exchange treatment, uses MMA as a solvent, which reduces the possibility of particle agglomeration. During the in-situ polymerization of MMA monomers, the possibility of particle agglomeration can be further reduced. Therefore, the PMMA light guide plate has high light transmittance and uniform scattering effect, which can avoid the optical performance imbalance caused by improper particle content or nanoparticle agglomeration. If the wet raw material is dried or solid nanoparticles are added directly, the nanoparticles will agglomerate or be unevenly dispersed, causing the light guide plate to lose Rayleigh scattering characteristics and affecting the optical performance of the light guide plate. Attached Figure Description

[0031] Figure 1 The diagram shows the blue light emitted by the Rayleigh scattering PMMA light guide plate in Examples 1-5, from left to right: Example 1, Example 2, Example 3, Example 4, and Example 5.

[0032] Figure 2 The transmittance test diagrams are for the Rayleigh scattering PMMA light guide plates in Examples 1-5.

[0033] Figure 3 The transmittance test diagrams are for Rayleigh scattering PMMA light guide plates in Examples 1, 3, and Comparative Example 1.

[0034] Figure 4 This is a transmission electron microscope image of the Rayleigh scattering PMMA light guide plate of Example 1.

[0035] Figure 5 This is a transmission electron microscope image of the Rayleigh scattering PMMA light guide plate in Example 3.

[0036] Figure 6 This is a schematic diagram of the Rayleigh scattering PMMA light guide plate in Example 3; 1-PMMA, 2-nano ZnO particles, 3-silane coupling agent.

[0037] Figure 7 This is a schematic diagram of Rayleigh scattering of the PMMA light guide plate in Example 3; 1-PMMA, 2-modified nano ZnO particles.

[0038] Figure 8 This is a schematic diagram of blue light emitted by a Rayleigh scattering PMMA light guide plate, as shown in Comparative Example 1.

[0039] Figure 9 This is a transmission electron microscope image of the Rayleigh scattering PMMA light guide plate in Comparative Example 1.

[0040] Figure 10 This is a schematic diagram of the Rayleigh scattering PMMA light guide plate for Comparative Example 1; 1-PMMA, 2-nano ZnO particles.

[0041] Figure 11 This is a particle size distribution diagram of ZnO in the Rayleigh scattering PMMA light guide plate of Comparative Example 1. Figure 12 This is a particle size distribution diagram of ZnO in the Rayleigh scattering PMMA light guide plate of Example 3.

[0042] Figure 13 The particle size distribution of ZnO in the Rayleigh scattering PMMA light guide plate is shown in Comparative Example 2.

[0043] Figure 14 This is a schematic diagram of blue light emitted by a Rayleigh scattering PMMA light guide plate, as shown in Comparative Example 3.

[0044] Figure 15 The particle size distribution of nano-TiO2 in the Rayleigh scattering PMMA light guide plate of Comparative Example 4 is shown.

[0045] Figure 16 The image shows the transmittance test results for the Rayleigh scattering PMMA light guide plate in Comparative Example 4. Detailed Implementation

[0046] Example 1 (Blank Control) The first aspect of this example provides a Rayleigh scattering PMMA light guide plate, the raw materials of which, by mass, include 20 mL of MMA monomer, 0.2 g of initiator BPO, 0.1 g of antioxidant 168, and 0.04 g of light stabilizer Tinuvin 1130.

[0047] The second aspect of this example provides a method for fabricating a Rayleigh scattering PMMA light guide plate, including the following steps: MMA monomer, antioxidant 168, and light stabilizer Tinuvin 1130 were mixed, and initiator BPO was added. Polymerization was carried out at 65°C. Heating was stopped when the MMA monomer reached a viscous state (approximately 500-1000 mPa·s), and air bubbles were removed by vacuum extraction. The mixture was poured into a mold and post-polymerized at 60°C for 24 hours. After post-polymerization, the material was demolded and trimmed to obtain a 3mm thick Rayleigh scattering PMMA light guide plate.

[0048] Example 2 The first aspect of this example provides a Rayleigh scattering PMMA light guide plate synthesized in situ with nano-ZnO. The raw materials for its preparation, by mass, include 20 mL of purified MMA monomer, 0.2 g of initiator BPO, 0.1 g of antioxidant 168, 0.04 g of light stabilizer Tinuvin 1130, and 0.2 mL of modified nano-ZnO particle dispersion.

[0049] The raw materials for preparing the modified nano-ZnO particle dispersion include zinc acetate dihydrate, silane coupling agent KH-570, NaOH aqueous solution, water, and anhydrous ethanol.

[0050] The preparation method of the modified nano-ZnO particle dispersion includes: S1. Weigh 1.0 g of zinc acetate dihydrate and dissolve it in 80 mL of anhydrous ethanol by sonication to obtain a zinc acetate solution; S2. Weigh 0.8g of NaOH and dissolve it in 50 mL of deionized water by sonication to obtain an aqueous solution of NaOH. S3. Add NaOH aqueous solution to zinc acetate solution to adjust the pH of the system to 10, and obtain ZnO particle dispersion; S4. Heat at 70℃ for 3 hours, add 5.0g of silane coupling agent KH-570, heat at 70℃ for 9 hours, then centrifuge 3 times, and then use MMA for solvent exchange to obtain the modified nano ZnO particle dispersion. The particle size of the modified nano ZnO particles is 50-200nm.

[0051] The second aspect of this example provides a method for preparing a Rayleigh scattering PMMA light guide plate by in-situ polymerization of nano-ZnO, including the following steps: MMA monomer, modified nano-ZnO particle dispersion, antioxidant 168, and light stabilizer Tinuvin 1130 were mixed, and initiator BPO was added. In-situ polymerization was carried out at 65°C. Heating was stopped when the MMA monomer reached a viscous state (approximately 500-1000 mPa·s), and vacuum degassing was performed to remove air bubbles. The mixture was then poured into a mold and post-polymerized at 60°C for 24 hours. After post-polymerization, the material was demolded and trimmed to obtain a 3mm thick Rayleigh scattering PMMA light guide plate.

[0052] Example 3 The specific implementation method in this example is the same as in Example 2, except that the amount of modified nano ZnO particle dispersion added is 0.4 mL.

[0053] Example 4 The specific implementation method in this example is the same as in Example 2, except that the amount of modified nano ZnO particle dispersion added is 0.6 mL.

[0054] Example 5 The specific implementation method in this example is the same as in Example 2, except that the amount of modified nano ZnO particle dispersion added is 0.8 mL.

[0055] Comparative Example 1 The specific implementation method in this example is the same as in Example 3, except that the raw materials for preparing the modified nano-ZnO particle dispersion do not include the silane coupling agent KH-570, that is, the raw material is a nano-ZnO dispersion that has not been modified by the silane coupling agent.

[0056] Comparative Example 2 The specific implementation method in this example is the same as in Example 3, except that the modified nano-ZnO particle dispersion is dried before being added to the reaction system as a raw material.

[0057] Comparative Example 3 The specific implementation method in this example is the same as in Example 3, except that the amount of modified nano-ZnO particle dispersion added is 2 mL.

[0058] Comparative Example 4 The specific implementation method in this example is the same as in Example 3, except that: the modified nano-TiO2 particle dispersion is replaced with an equal mass fraction of modified nano-ZnO particle dispersion, and the particle size of the modified nano-TiO2 in the modified nano-TiO2 particle dispersion is 300-400nm (average particle size is 330nm).

[0059] The modified nano-TiO2 particle dispersion is prepared as follows: 80 mL of isopropanol and 30 mL of water are added to a three-necked flask by mass. Stirring is started and the temperature is raised to 70°C. 1 part of isopropyl titanate is added, and the mixture is refluxed for 3 hours. Then, 3 parts of silane coupling agent KH-570 are added and the mixture is refluxed for another 3 hours. After the reaction is completed, the mixture is centrifuged and then subjected to solvent exchange treatment using MMA to obtain the modified nano-TiO2 dispersion.

[0060] Performance testing The Rayleigh scattering light guide plates prepared in the above embodiments and comparative examples were subjected to optical performance tests and transmission electron microscopy (TEM) scanning tests.

[0061] Specifically, the blue light schematic diagrams of Rayleigh scattering PMMA light guide plates in Examples 1-5 are shown below. Figure 1 As shown, from left to right, they are Example 1, Example 2, Example 3, Example 4, and Example 5; the transmittance diagrams of the Rayleigh scattering PMMA light guide plates in Examples 1-5 are shown below. Figure 2 As shown; schematic diagrams of the transmittance of Rayleigh scattering PMMA light guide plates in Examples 1, 3, and Comparative Example 1 are shown below. Figure 3 As shown; the transmission electron microscope image of the Rayleigh scattering PMMA light guide plate in Example 1 is shown below. Figure 4 As shown; the transmission electron microscope image of the Rayleigh scattering PMMA light guide plate in Example 3 is shown below. Figure 5 As shown; a schematic diagram of the Rayleigh scattering PMMA light guide plate in Example 3 is shown. Figure 6 As shown; where 1-PMMA, 2-nano ZnO particles, 3-silane coupling agent; Example 3 Rayleigh scattering PMMA light guide plate Rayleigh scattering schematic diagram is shown. Figure 7 As shown, 1-PMMA, 2-modified nano-ZnO particles; Comparative Example 1: Rayleigh scattering PMMA light guide plate appearance schematic diagram as shown. Figure 8 As shown; Comparative Example 1: Transmission electron microscope image of Rayleigh scattering PMMA light guide plate. Figure 9 As shown; a schematic diagram of the Rayleigh scattering PMMA light guide plate in Comparative Example 1 is shown below. Figure 10 As shown, 1-PMMA, 2-nanometer ZnO particles; Comparative Example 1: ZnO particle size distribution in Rayleigh scattering PMMA light guide plate is shown in the figure. Figure 11 As shown, the average particle size of ZnO is 1200 nm; the particle size distribution of ZnO in the Rayleigh scattering PMMA light guide plate in Example 3 is shown in the figure. Figure 11 As shown, the average particle size of ZnO is 170 nm; the particle size distribution of ZnO in the Rayleigh scattering PMMA light guide plate in Comparative Example 2 is shown in the figure below. Figure 13 As shown, the average particle size of ZnO is 5500 nm. A schematic diagram of the blue light emitted by the Rayleigh scattering PMMA light guide plate in Comparative Example 3 is shown below. Figure 14 As shown in Figure 4; the particle size distribution of nano-TiO2 in the Rayleigh scattering PMMA light guide plate is shown in Figure 4. Figure 15 As shown, the average particle size of TiO2 is 330 nm. The transmittance diagram of the Rayleigh scattering PMMA light guide plate in Comparative Example 4 is shown below. Figure 16 As shown.

[0062] As can be seen from the transmission electron microscopy images of ultrathin sections of Examples 1, 3, and Comparative Example 1, after surface modification of nano-ZnO particles with silane coupling agent KH-570 in Example 3, the nanoparticles did not show significant large particle aggregation in PMMA and were uniformly dispersed in PMMA; while the nanoparticles in Comparative Example 1 showed significant large particle aggregation in PMMA and could not be uniformly dispersed in PMMA, so its transmittance was relatively poor.

[0063] As can be seen from Example 3 and Comparative Example 2, in this invention, due to the addition of wet-state modified nano-ZnO particle dispersion treated with MMA solvent exchange, and the use of in-situ polymerization process during preparation, the nano-ZnO particles in the PMMA light guide plate obtained by MMA monomer polymerization are more uniformly dispersed, and the light guide plate has excellent Rayleigh scattering effect. However, when dried nano-ZnO particles are used as raw materials, the particles are more likely to agglomerate, so the light guide plate does not have Rayleigh scattering effect.

[0064] As shown in Example 3 and Comparative Example 3, adding too many nanoparticles results in poor Rayleigh scattering performance of the prepared Rayleigh scattering light guide plate. Therefore, it is necessary to control the content of nanoparticles in PMMA to achieve the desired Rayleigh scattering effect.

[0065] As can be seen from Example 3 and Comparative Example 4, wet nano-ZnO particles have a smaller particle size than nano-TiO2 particles. When added in the form of a dispersion, the light guide plate has higher light transmittance. This indicates that wet modified nano-ZnO particles are less prone to agglomeration during the preparation of PMMA light guide plates, and PMMA light guide plates have better Rayleigh scattering effect and higher light transmittance.

Claims

1. A Rayleigh scattering PMMA light guide plate polymerized in situ with nano-ZnO, characterized in that, The raw materials, by mass, include 10-30 parts MMA monomer, 0.1-0.3 parts initiator, 0.1-1 parts modified nano ZnO particle dispersion, 0.1-0.2 parts antioxidant, and 0.01-0.1 parts light stabilizer; The modified nano-ZnO particles in the modified nano-ZnO particle dispersion have a particle size of 50-200 nm. The raw materials for preparing the modified nano-ZnO particle dispersion include ZnO precursor, silane coupling agent, alkali and solvent.

2. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The alkali mentioned includes aqueous solutions of NaOH or KOH.

3. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The ZnO precursor includes one of zinc acetate dihydrate, zinc nitrate hexahydrate, zinc acetate, or zinc acetylacetonate.

4. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The silane coupling agent includes one of KH-550, KH-560, KH-570, KH-580 or A-1160.

5. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The preparation method of the modified nano-ZnO particle dispersion includes the following steps: A solvent was added to the ZnO precursor, and the solution was dissolved by ultrasonication to obtain a ZnO precursor solution. Then, an alkali was added to adjust the pH of the system to 9-12 to obtain a ZnO particle dispersion. Then, a silane coupling agent is added and reacted, centrifuged, and solvent exchange is performed using MMA to obtain a modified nano-ZnO particle dispersion containing modified nano-ZnO particles.

6. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The initiator includes peroxide initiators or azo initiators.

7. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The antioxidants mentioned include at least one of hindered phenolic antioxidants, phosphite antioxidants, hindered amine antioxidants, and thioester antioxidants.

8. The Rayleigh scattering PMMA light guide plate according to claim 7, characterized in that, Phosphite antioxidants include monophosphite antioxidants or bisphosphite antioxidants.

9. The Rayleigh scattering PMMA light guide plate according to claim 1, characterized in that, The light stabilizer includes one or more of Tinuvin 1130, Tinuvin 477, Tinuvin 329, Tinuvin 571, and Tinuvin 234.

10. A method for preparing a Rayleigh scattering PMMA light guide plate according to any one of claims 1-9, characterized in that, Includes the following steps: Mix MMA monomer, modified nano-ZnO particle dispersion, antioxidant and light stabilizer, add initiator, and polymerize in situ at 65-80℃. Then remove air bubbles, pour into a mold, and polymerize at 50-60℃ for 24-48 hours to obtain Rayleigh scattering PMMA light guide plate.

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