Filtering Rayleigh scattering composite plate and production method

Abstract

The present invention provides a filtering Rayleigh scattering composite plate and a production method. The composite plate includes a Rayleigh scattering layer and a filter layer formed on the Rayleigh scattering layer. The filter layer is made of polymethyl methacrylate containing a blue light blocking agent, and the amount of the blue light blocking agent added to the filter layer is 0.01% to 1%. The addition of a blue light absorber to form the filter layer and composite it with the Rayleigh scattering layer not only maintains the Rayleigh function of the Rayleigh scattering layer, but also absorbs and filters out some blue light. This reduces the blue light transmittance when the Rayleigh scattering plate is used in a blue sky lamp, providing eye protection and improving the practicality and safety of the blue sky lamp.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer plates, and in particular relates to a filtering Rayleigh scattering composite plate and a production method thereof. Background Art

[0002] Rayleigh scattering is an optical phenomenon, a type of scattering also known as "molecular scattering." When particles are much smaller than the wavelength of the incident light—specifically, when the particle diameter is less than one-tenth of the wavelength—short-wavelength blue light is scattered. The intensity of the scattered light varies in different directions, and this intensity is inversely proportional to the fourth power of the wavelength of the incident light. Typical natural phenomena of Rayleigh scattering include the blue color of the sky, the blue color of the sea, and the red color of sunset clouds.

[0003] Invention patent CN112876795A discloses a method for preparing an optical diffuser, achieving a uniform and random distribution of nanoparticles within a polymer matrix, reducing optical interference effects and improving the optical properties of the composite material. In particular, the diffuser can effectively separate white visible light, achieving a simulated sky effect. This technology led to the development of the Blue Sky Light, with patents CN214425752U, CN215294664U, CN215929335U, CN217635366U, and CN212156893U disclosing the specific technical methods for the Blue Sky Light.

[0004] The lighting module used in the Blue Sky Lamp uses light in the 1700-8000k range as its light source. Due to Rayleigh scattering, blue light is scattered, creating a simulated sky effect. While this type of lamp is aesthetically pleasing, it produces a high luminous flux of blue light. It is well known that blue light is harmful to the human eye. Blue light can penetrate the lens directly into the retina, causing atrophy or even death of retinal pigment epithelial cells. It can also cause visual fatigue and suppress melatonin secretion. These issues limit the further application of Blue Sky Lamp. Summary of the Invention

[0005] In response to the above technical problems, this application proposes a filtering Rayleigh scattering composite plate and a production method. The specific technical solutions are as follows:

[0006] In the first aspect, the present application provides a filtering Rayleigh scattering composite plate, comprising a Rayleigh scattering layer and a filter layer formed on the Rayleigh scattering layer, wherein the filter layer is polymethyl methacrylate containing an anti-blue light agent, and the amount of the anti-blue light agent added to the filter layer is 0.01% to 1%.

[0007] As a preferred embodiment of some specific embodiments, the amount of the anti-blue light agent added to the filter layer is 0.05%~0.5%.

[0008] In a specific embodiment, the blue light blocking agent is a substance having at least one of a naphthalene ring, anthracene ring, porphyrin ring, benzoxazole, anthraquinone and benzazapyrrole in its molecular structure.

[0009] As a preferred embodiment of some specific embodiments, the blue light blocking agent is a substance having only naphthalene rings in its molecular structure.

[0010] In a specific embodiment, a bluing agent is further included, wherein the bluing agent is a solvent dye having a blue or bluish-violet color.

[0011] As a preferred embodiment of some specific embodiments, the amount of the bluing agent added does not exceed 0.1%.

[0012] In a second aspect, the present application provides a method for producing a filtered Rayleigh scattering composite plate, the method being used to produce the above-mentioned composite plate, the method comprising:

[0013] Prepare MMA clinker with a polymerization conversion rate of 10-20%;

[0014] Add initiator, release agent and blue light protection agent, stir and disperse evenly;

[0015] After vacuum degassing, place the Ruili scattering plate on the mold and place the sealing strip. After closing the mold, pour the mixed material into the mold.

[0016] Transfer to a water bath at 60 ± 5 °C for polymerization;

[0017] After the polymerization is completed, the composite board is obtained by high temperature setting at 100-130℃, cooling and opening the mold.

[0018] In a third aspect, the present application provides another method for producing a filtering Rayleigh scattering composite plate, the method comprising:

[0019] Prepare MMA clinker with a polymerization conversion rate of 10-20%;

[0020] Add initiator, release agent and blue light protection agent, stir and disperse evenly;

[0021] After vacuum degassing, place a sealing strip on the mold, close the mold and pour the mixed material into the mold;

[0022] Transfer to a water bath at 60 ± 5 °C for polymerization;

[0023] After the polymerization is completed, the filter layer is obtained by high temperature setting at 100-130℃, cooling and opening the mold;

[0024] Glue is applied on the surface of the Rayleigh scattering plate, a filter layer is placed on the glue, and the glue is solidified by molding to obtain a composite plate.

[0025] In a specific embodiment, the glue comprises: 80%-90% methyl methacrylate with a polymerization conversion rate of 10-20%, 0.1%-5% oxidant, 0.1%-5% reducing agent, 0.1%-5% crosslinking agent, 0.1%-0.5% anti-ultraviolet agent, and 0.1-5% other additives.

[0026] The beneficial effects of the present invention are:

[0027] (1) After adding a blue light absorber to form a filter layer and compounding it with the Rayleigh scattering layer, it can not only ensure the Rayleigh scattering function of the Rayleigh scattering layer, but also absorb and filter out part of the blue light, reducing the transmittance of blue light when the Rayleigh scattering plate is applied to the blue sky lamp, playing a role in protecting the human eyes and improving the practicality and safety of the blue sky lamp;

[0028] (2) Selecting substances containing only naphthalene ring structures as anti-blue light additives can filter out and absorb blue light in the light, especially the short-wavelength high-energy blue light, thereby improving the protection of human eyes. On the other hand, substances containing only naphthalene ring structures can also overcome the yellowing phenomenon caused by adding anti-blue light additives in the filter layer, ensuring that the Rayleigh scattering composite board can simulate the blue sky effect when applied to the blue sky lamp;

[0029] (3) Due to the shielding of ultraviolet rays, the damage of ultraviolet rays to the board is reduced, the yellowing problem caused by ultraviolet rays to the board is reduced, and the service life of the board is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shown is a structural schematic diagram of a composite plate;

[0031] Figure 2 Shown is another structural schematic diagram of a composite plate. DETAILED DESCRIPTION

[0032] In the following description, certain specific details are set forth in order to provide a thorough understanding of various embodiments. However, it will be understood by those skilled in the art that the present invention may be practiced without these details.

[0033] Rayleigh scattering

[0034] Rayleigh scattering is an optical phenomenon, a type of scattering also known as "molecular scattering." When particles are much smaller than the wavelength of the incident light (less than one-tenth of the wavelength), the intensity of the scattered light varies in different directions, and this intensity is inversely proportional to the fourth power of the wavelength of the incident light. This phenomenon is called Rayleigh scattering.

[0035] Rayleigh scatterer

[0036] Rayleigh scatterer is an optical device based on the principle of Rayleigh scattering, which is mainly used for scattering and homogenizing light.

[0037] The particles that form Rayleigh scattering in the Rayleigh scattering plate include:

[0038] Metal oxides (such as SiO2, TiO2, ZnO);

[0039] Metal nanoparticles (e.g., Au, Ag);

[0040] Carbon-based nanomaterials (e.g., carbon nanotubes, graphene);

[0041] semiconductor nanoparticles (e.g., quantum dots);

[0042] Other inorganic nanoparticles (such as Si3N4, Al2O3).

[0043] Blue light blocking agent

[0044] For absorbing blue light, substances with naphthalene rings, anthracene rings, porphyrin rings, benzoxazoles, anthraquinones, and benzazepine pyrroles in their molecular structures are used. Examples of naphthalene rings include naphthalene; anthracene rings include anthracene; porphyrin rings include tetraphenylporphyrin; benzoxazoles include 2-phenylbenzoxazole; anthraquinones include anthraquinone; and benzazepine pyrroles include indole.

[0045] Bluing agent

[0046] For solvent dyes having a blue or bluish-violet color, conventional solvent dyes having a blue or bluish-violet color can be used as bluing agents. Known substances can be used as bluing agents. For example, according to the trade names, there are Macrolex (registered trademark) Blue RR (manufactured by Bayer), Macrolex (registered trademark) Blue 3R (manufactured by Bayer), Sumiplast (registered trademark) Viloet B (manufactured by Sumika Chemtex), Polysynthren (registered trademark) Blue RLS (manufactured by Clariant), Diaresin Violet D, Diaresin Blue G, Diaresin Blue N (all manufactured by Mitsubishi Chemical Corporation).

[0047] initiator

[0048] Used in MMA polymerization reaction, including one or more of azobisisobutyronitrile, azobisisoheptanenitrile, and dibenzoyl peroxide.

[0049] release agent

[0050] In the production process of PMMA (polymethyl methacrylate), silicone oils and fluorine-based release agents are the most commonly used additives to improve the demoulding efficiency of the product. Silicone oils, for example, are polydimethylsiloxane.

[0051] glue

[0052] It plays the role of interface bonding, including: 80%-90% of methyl methacrylate with a polymerization conversion rate of 10-20%, 0.1%-5% of oxidant, 0.1%-5% of reducing agent, 0.1%-5% of cross-linking agent, 0.1%-0.5% of anti-ultraviolet agent, and 0.1-5% of other additives.

[0053] The oxidant includes one or more of benzoyl peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, dicumyl peroxide, methyl ethyl ketone peroxide, and 1,1-di(tert-butylperoxy)cyclohexane.

[0054] The reducing agent includes one or more of ethylenediamine, N,N-dimethylaniline, N,N-dimethyl-p-toluidine, N,N-diethyl-p-toluidine, N,N-dihydroxyethyl-p-toluidine, N,N-dimethyl-o-toluidine, 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-vinylimidazole, and diethylenetriamine.

[0055] The crosslinking agent includes one or more of 1,4-butanediol dimethacrylate, ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, divinylbenzene, trimethoxypropane trimethacrylate, pentaerythritol triacrylate, hydroxyethyl acrylate, glycidyl acrylate, and dipropylene glycol diacrylate.

[0056] The anti-ultraviolet agent includes one or more of ultraviolet absorber uv-p, ultraviolet absorber uv-329, ultraviolet absorber uv-234, ultraviolet absorber uv-o and ultraviolet absorber uv-531.

[0057] Unless otherwise specified, the raw materials in the following examples and comparative examples in this application were purchased from the market.

[0058] All percentages in this application are by mass.

[0059] In this application, the transmittance is measured using an ultraviolet spectrophotometer at 350-500 nm.

[0060] In this application, the Rayleigh scattering effect measurement method is:

[0061] (1) In a dark room, irradiate the plate with a 350-500 nm light source vertically. In addition to the direction perpendicular to the plate, randomly select 8 positions to form a non-90° angle with the plate. Use a photometer to measure the scattered light intensity at different angles at a straight distance of 50 cm from the plate. Calculate the average value and form a ratio with the incident light intensity.

[0062] (2) Use a spectrometer to analyze the spectrum of the scattered light and confirm whether it is Rayleigh scattering (the intensity of scattered light is inversely proportional to the fourth power of the wavelength).

[0063] Example 1

[0064] Provided is a composite board, the composite board as Figure 1 As shown, it includes a Rayleigh scattering layer 10 and a filter layer 20, wherein the Rayleigh scattering layer 10 is made of the same raw materials and process as in Comparative Example 2, and has a thickness of 3 mm.

[0065] The preparation method of the filter layer is as follows:

[0066] Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to the mixing tank;

[0067] Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes;

[0068] After vacuum degassing, place the Ruili scattering plate on the mold and place the sealing strip. After closing the mold, pour the mixed material into the mold.

[0069] Transfer to a water bath at 60 ± 5 °C for polymerization;

[0070] After the polymerization is completed, the composite plate including the Rayleigh scattering layer 10 and the filter layer 20 is obtained by high-temperature shaping at 100-130°C, cooling, and mold opening. The filter layer 20 is integrated with the Rayleigh scattering layer 10 during curing, with a total thickness of 5 mm.

[0071] In the above method, the mass fraction of azobisisobutyronitrile in the total material is 0.01%, the mass fraction of polydimethylsiloxane in the total material is 0.01%, and the mass fraction of anthraquinone in the total material is 0.1%.

[0072] Comparative Example 1

[0073] First, a masterbatch raw material ratio is provided, including 99.4% PMMA, 0.5% titanium dioxide nanoparticles and 0.1% anthraquinone, and the particle size of the titanium dioxide nanoparticles is 5~40nm.

[0074] Preparation of the Rayleigh scattering plate:

[0075] (1) Mixing the crushed PMMA, anthraquinone and titanium dioxide nanoparticles uniformly;

[0076] (2) After the mixture is melted, it is extruded, kneaded and pelletized to obtain a masterbatch;

[0077] (3) The masterbatch is made into a Ruili scattering plate containing an anti-blue light additive through an injection molding process, with a thickness of 3 mm.

[0078] Comparative Example 2

[0079] First, a masterbatch raw material ratio is provided, including 99.5% PMMA and 0.5% titanium dioxide nanoparticles, and the particle size of the titanium dioxide nanoparticles is 5~40nm.

[0080] Preparation of the Rayleigh scattering plate:

[0081] (1) Mixing the crushed PMMA and titanium dioxide nanoparticles uniformly;

[0082] (2) After the mixture is melted, it is extruded, kneaded and pelletized to obtain a masterbatch;

[0083] (3) The masterbatch is made into a Ruili scattering plate through injection molding process with a thickness of 3 mm.

[0084] The transmittance and Rayleigh scattering effect of the plates of Example 1 and Comparative Examples 1 and 2 were evaluated in the blue-violet light band of 380-500 nm. The results are shown in Table 1.

[0085]

[0086] As can be seen from Table 1, since Comparative Example 1 contains a trace amount of anthraquinone compared to Comparative Example 2, anthraquinone acts as a blue light absorber, causing the light transmittance to drop significantly after passing through the plate of Comparative Example 1. The ratio of the average intensity of scattered light to the intensity of incident light is also extremely low. During testing, it was observed that the plate of Comparative Example 1 exhibited high transparency and low blueness during testing. In contrast, Example 1, based on the existing polymethyl methacrylate plate, added an amount of anthraquinone equivalent to that of Comparative Example 1 to form a filter layer on top of the plate of Comparative Example 2. The transmittance also dropped significantly, but the ratio of the average intensity of scattered light to the intensity of incident light did not drop significantly. During testing, it was observed that Example 1 still exhibited a comfortable visual blueness during testing. This indicates that the use of anthraquinone as a blue light absorber to form a filter layer and to combine it with the Rayleigh scattering layer can further absorb and filter out some blue light while maintaining the Rayleigh function of the Rayleigh scattering layer. This reduces the transmittance of blue light when the Rayleigh scattering plate is applied to the blue sky lamp, thus protecting the human eye and improving the practicality and safety of the blue sky lamp.

[0087] Example 2

[0088] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 0.01%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to accommodate the anthraquinone.

[0089] Example 3

[0090] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 0.05%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to accommodate the anthraquinone.

[0091] Example 4

[0092] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 0.2%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to accommodate the anthraquinone.

[0093] Example 5

[0094] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 0.5%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to adapt to the anthraquinone.

[0095] Example 6

[0096] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 0.8%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to adapt to the anthraquinone.

[0097] Example 7

[0098] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 1%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to adapt to the anthraquinone.

[0099] Comparative Example 3

[0100] The difference between the composite board in this embodiment and that in embodiment 1 is that the mass fraction of anthraquinone is adjusted to 1.1%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to accommodate the anthraquinone.

[0101] The transmittance and Rayleigh scattering effect of the panels of Examples 2 to 7 and Comparative Example 3 were evaluated in the 380-500 nm blue-violet light band. The results are shown in Table 2.

[0102]

[0103] As can be seen from Table 2, as the anthraquinone content in the filter layer increases, the absorption of blue-violet light increases, which in turn leads to a decrease in light transmittance. The ratio of the average intensity of scattered light to the intensity of incident light also decreases accordingly. Although the scattered light can still be detected to meet the light intensity conditions for Rayleigh scattering, the blueness of the board in Comparative Example 3 is significantly reduced and it also becomes yellowish. In particular, the yellowing of the filter layer is more obvious under non-test conditions (when the board is placed under natural light conditions). Although some yellowing of the filter layer can be seen in Examples 6 and 7 under non-test conditions, this slight yellowing is not visible to the naked eye during testing. Therefore, to ensure that the composite board of the present application can be used in lighting products and to ensure its blue sky lamp functionality, it is necessary to limit the amount of anthraquinone added to the filter layer to 0.01% to 1%; and to ensure that the blue sky lamp better simulates the effect of a blue sky, the amount of anthraquinone added should not exceed 0.5%. To ensure the control of blue light transmittance, the amount of anthraquinone added should not be less than 0.05%. That is, the amount of anthraquinone added to the filter layer is more preferably 0.05% to 0.5%.

[0104] Example 8

[0105] The difference between the composite plate in this embodiment and that in embodiment 7 is that anthraquinone is replaced by naphthalene.

[0106] Example 9

[0107] The difference between the composite plate in this embodiment and that in embodiment 7 is that anthraquinone is replaced by anthracene.

[0108] Example 10

[0109] The difference between the composite plate in this embodiment and that in embodiment 7 is that anthraquinone is replaced by tetraphenylporphyrin.

[0110] Example 11

[0111] The difference between the composite plate in this embodiment and that in embodiment 7 is that anthraquinone is replaced by 2-phenylbenzoxazole.

[0112] Example 12

[0113] The difference between the composite plate in this embodiment and that in embodiment 7 is that anthraquinone is replaced by indole.

[0114] The transmittance and Rayleigh scattering effect of the panels of Examples 8 to 12 were evaluated in the 380-500 nm blue-violet light band. The results are shown in Table 3.

[0115]

[0116] It can be seen from Table 3 that replacing anthraquinone with other substances with different molecular structures does not have a significant effect on the final light transmittance and Rayleigh scattering effect of the board. However, compared with other embodiments, in Example 8 in which anthraquinone is replaced by naphthalene, even under non-test conditions, the filter layer and Rayleigh scattering layer of the composite board do not show yellowing, indicating that the use of substances containing only naphthalene ring structures in the anti-blue light additive is most beneficial for the application of blue sky lamps.

[0117] The transmittance of the filter layers of Examples 7 to 12 was tested at 380 nm, 400 nm, 415 nm, 450 nm, 480 nm, and 500 nm blue-violet light bands. The filter layers were single layers and were prepared as follows:

[0118] Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to the mixing tank;

[0119] Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes;

[0120] After vacuum degassing, place a sealing strip on the mold, close the mold and pour the mixed material into the mold;

[0121] Transfer to a water bath at 60 ± 5 °C for polymerization;

[0122] After the polymerization is completed, the filter layer is obtained by high temperature setting at 100-130°C, cooling and opening the mold, with a thickness of 2mm.

[0123] The results are shown in Table 4.

[0124]

[0125] As can be seen from Table 4, embodiment 8 and 9 mainly have more significant shielding effect to the light less than 415nm to wavelength, and the shielding effect using the material only containing naphthalene ring structure in embodiment 8 is better.In conjunction with Table 3, it can be found that, in filtering layer, adding the material only containing naphthalene ring structure has very significant effect when Rayleigh scattering composite plate is applied to blue sky lamp, it can filter the blue light in the absorption light on the one hand, especially short wavelength high energy blue light therein, improve the protectiveness to human eyes, on the other hand, only containing the material of naphthalene ring structure can also overcome the yellowing phenomenon caused by adding anti-blue light auxiliary agent in filtering layer, ensure that Rayleigh scattering composite plate simulates the effect of blue sky when being applied to blue sky lamp.

[0126] Example 13

[0127] The difference between the composite plate in this embodiment and that in embodiment 7 is that the filter layer 20 further contains a bluing agent, the mass fraction of the bluing agent in the total material is 0.08%, the content of azobisisobutyronitrile and polydimethylsiloxane remains unchanged, and the MMA clinker is adjusted to adapt to the bluing agent.

[0128] Example 14

[0129] The difference between the composite plate in this embodiment and that in embodiment 7 is that the filter layer 20 further contains a bluing agent, the mass fraction of the bluing agent in the total material is 0.1%, the contents of azobisisobutyronitrile and polydimethylsiloxane remain unchanged, and the MMA clinker is adjusted to adapt to the bluing agent.

[0130] Comparative Example 4

[0131] The difference between the composite plate in this embodiment and comparative example 3 is that the filter layer 20 also contains a bluing agent, the mass fraction of the bluing agent in the total material is 0.11%, the content of azobisisobutyronitrile and polydimethylsiloxane remains unchanged, and the MMA clinker is adjusted to adapt to the bluing agent.

[0132] The transmittance and Rayleigh scattering effect of the plates of Example 13 and Example 14 and Comparative Example 4 were evaluated in the blue-violet light band of 380-500 nm. The results are shown in Table 5.

[0133]

[0134] As can be seen from Table 5, when the bluing agent is added within 0.1%, it does not affect the Rayleigh scattering effect of the composite board and its. At the same time, by observing the filter layers of Examples 13 and 14, it can be found that due to the addition of a certain amount of bluing agent, the yellowing phenomenon of the original filter layer is also significantly covered. Under non-test conditions, the yellowing phenomenon is already difficult to distinguish with the naked eye. However, after the addition amount of bluing agent in Comparative Example 4 exceeds 0.1%, although the yellowing phenomenon is no longer observed, the filter layer is obviously bluish. Due to the addition of the bluing agent, the transmittance is affected, the transparency of the composite board is also reduced, and the Rayleigh scattering effect is also affected. Therefore, when the use of anti-blue light additives in the composite board causes a certain degree of yellowing of the filter layer, this phenomenon can be improved by adding a small amount of bluing agent. However, when no yellowing occurs, the use of bluing agent should be avoided as much as possible, and the amount of bluing agent should be controlled to not exceed 0.1%.

[0135] Example 15

[0136] This embodiment provides another composite board and preparation method different from that of embodiment 1.

[0137] like Figure 2 As shown, the plate material of this embodiment includes a Rayleigh scattering layer 10, a filter layer 20 and an adhesive layer 30. The Rayleigh scattering layer 10 and the filter layer 20 are bonded and fixed by the adhesive layer 30 to form a composite plate. The Rayleigh scattering layer 10 is made of the same raw materials and process as in Comparative Example 2 and has a thickness of 3 mm.

[0138] The preparation method of the filter layer is as follows:

[0139] Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to the mixing tank;

[0140] Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes;

[0141] After vacuum degassing, place a sealing strip on the mold, close the mold and pour the mixed material into the mold;

[0142] Transfer to a water bath at 60 ± 5 °C for polymerization;

[0143] After the polymerization is completed, the filter layer 20 is obtained by high-temperature shaping at 100-130° C., cooling, and mold opening. The thickness of the filter layer 20 is 2 mm.

[0144] In the above method, the mass fraction of azobisisobutyronitrile in the total material is 0.01%, the mass fraction of polydimethylsiloxane in the total material is 0.01%, and the mass fraction of anthraquinone in the total material is 0.1%.

[0145] The preparation method of the composite board is as follows:

[0146] The Rayleigh scattering layer 10 is placed at the bottom, and reactive glue is applied on the surface of the Rayleigh scattering layer 10;

[0147] Place the filter layer 20 on the glue, adjust the gap between the two rollers of the laminating machine, and perform molding through the laminating machine;

[0148] After the glue is completely cured, a composite board is obtained.

[0149] The reaction glue specifically comprises: 90% of methyl methacrylate with a polymerization conversion rate of 10-20%, 3% of benzoyl oxide, 3% of ethylenediamine, 3.5% of hydroxyethyl acrylate, and 0.5% of ultraviolet absorber UV-329.

[0150] After testing, the composite plate Example 1 obtained in this embodiment has similar light transmittance and Rayleigh scattering effect.

[0151] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A filtering Rayleigh scattering composite plate, comprising a Rayleigh scattering layer, characterized in that: It also includes a filter layer formed on the Rayleigh scattering layer, wherein the filter layer is polymethyl methacrylate containing an anti-blue light agent, and the amount of the anti-blue light agent added to the filter layer is 0.05% to 0.5%. The anti-blue light agent is a substance with only a naphthalene ring in its molecular structure.

2. The filtering Rayleigh scattering composite plate according to claim 1, characterized in that: Also included is a bluing agent, which is a solvent dye with a blue or bluish-violet color.

3. The filtering Rayleigh scattering composite plate according to claim 2, characterized in that: The amount of the bluing agent added does not exceed 0.1%.

4. A method for producing a filtering Rayleigh scattering composite plate, characterized in that: The method is used to produce the composite board according to any one of claims 1 to 3, and the method comprises: Prepare MMA clinker with a polymerization conversion rate of 10-20%; Add initiator, release agent and blue light protection agent, stir and disperse evenly; After vacuum degassing, place the Ruili scattering plate on the mold and place the sealing strip. After closing the mold, pour the mixed material into the mold. Transfer to a water bath at 60 ± 5 °C for polymerization; After the polymerization is completed, the composite board is obtained by high temperature setting at 100-130℃, cooling and opening the mold.

5. A method for producing a filtering Rayleigh scattering composite plate, characterized in that: The method is used to produce the composite board according to any one of claims 1 to 3, and the method comprises: Prepare MMA clinker with a polymerization conversion rate of 10-20%; Add initiator, release agent and blue light protection agent, stir and disperse evenly; After vacuum degassing, place a sealing strip on the mold, close the mold and pour the mixed material into the mold; Transfer to a water bath at 60 ± 5 °C for polymerization; After the polymerization is completed, the filter layer is obtained by high temperature setting at 100-130℃, cooling and opening the mold; Glue is applied to the surface of the Rayleigh scattering plate, a filter layer is placed on the glue, and the glue is solidified by molding to obtain a composite plate.

6. The method for producing a filtering Rayleigh scattering composite plate according to claim 5, characterized in that: The glue comprises: 80%-90% of methyl methacrylate with a polymerization conversion rate of 10-20%, 0.1%-5% of an oxidizing agent, 0.1%-5% of a reducing agent, 0.1%-5% of a cross-linking agent, 0.1%-0.5% of an anti-ultraviolet agent, and 0.1-5% of other additives.

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