Filtering type Rayleigh scattering composite board and production method thereof

Abstract

The invention provides a filter type Rayleigh scattering composite board and a production method, the composite board comprises a Rayleigh scattering layer and a filter layer formed on the Rayleigh scattering layer, the filter layer is polymethyl methacrylate containing a blue light-proof auxiliary agent, and the addition amount of the blue light-proof auxiliary agent in the filter layer is 0.01%-1%. After the blue light absorbent is added to form the filter layer and is compounded with the Rayleigh scattering layer, the Rayleigh function of the Rayleigh scattering layer is ensured, part of blue light can be absorbed and filtered out, the transmittance of the blue light is reduced when the Rayleigh scattering plate is applied to the green lamp, the purpose of protecting human eyes is achieved, and the practicability and safety of the green lamp are improved.

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 the particle size is 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, and the intensity of the scattered light in each direction is different, and the intensity is inversely proportional to the fourth power of the wavelength of the incident light. Typical natural phenomena of Rayleigh scattering include the blue sky, the blue sea, the red sunset, etc.

[0003] Invention patent CN112876795A discloses a method for preparing an optical diffuser, achieving uniform and random distribution of nanoparticles in a polymer matrix, reducing optical interference effects, and improving the optical properties of composite materials, especially in the application of light diffusers, which can effectively separate white visible light and achieve the effect of simulating the sky. From this technology, blue sky lamps were derived, and patents CN214425752U, CN215294664U, CN215929335U, CN217635366U, and CN212156893U disclosed specific technical methods for blue sky lamps.

[0004] The lighting module selected by the blue sky lamp uses the light in the range of 1700-8000k as the light source. Due to the Rayleigh scattering effect, the blue light is scattered, forming the effect of simulating the sky. Although this kind of lamp has excellent aesthetic effect, the blue light flux it produces is relatively high. As we all know, blue light can cause damage to the human eye. Blue light can penetrate the lens directly to the retina, causing atrophy or even death of retinal pigment epithelial cells. In addition, blue light can easily cause visual fatigue and inhibit the secretion of melatonin. These problems limit the further application of blue sky lamps. Summary of the invention

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

[0006] As a preferred embodiment of some specific embodiments, the amount of the anti-blue light auxiliary agent added to the filter layer is 0.05%~0.5%.

[0007] 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.

[0008] As a preferred embodiment of some specific embodiments, the blue light protection auxiliary agent is a substance having only naphthalene rings in its molecular structure.

[0009] In a specific embodiment, a bluing agent is further included, and the bluing agent is a solvent dye having a blue or bluish purple color.

[0010] As preferred in some specific embodiments, the amount of the bluing agent added does not exceed 0.1%.

[0011] In a second aspect, the present application provides a method for producing a filtering Rayleigh scattering composite plate, the method being used to produce the above-mentioned composite plate, the method comprising: 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 a sealing strip, 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 composite board is obtained by high temperature setting at 100-130°C, cooling and opening the mold.

[0012] In a third aspect, the present application provides another method for producing a filtering Rayleigh scattering composite plate, the method comprising: 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°C, cooling and opening the mold; 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.

[0013] In a specific implementation scheme, the glue is: 80%-90% of methyl methacrylate with a polymerization conversion rate of 10-20%, 0.1%-5% of an oxidant, 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.

[0014] The beneficial effects of the present invention are: (1) After adding a blue light absorber to form a filter layer and compounding it with the Rayleigh scattering layer, it not only ensures the Rayleigh scattering function of the Rayleigh scattering layer, but also absorbs and filters out part of the blue light, reducing the transmittance of blue light when the Rayleigh scattering plate is applied to the blue sky lamp, thus protecting the human eyes and improving the practicality and safety of the blue sky lamp; (2) Selecting substances containing only naphthalene ring structures as anti-blue light additives can filter out and absorb blue light in the light, especially short-wavelength high-energy blue light, to improve 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 the effect of simulating the blue sky when the Rayleigh scattering composite board is applied to the blue sky lamp; (3) Since ultraviolet rays are shielded, the damage caused by ultraviolet rays to this type of 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

[0015] Figure 1 What is shown is a structural schematic diagram of a composite plate; Figure 2 Another structural schematic diagram of a composite plate is shown. DETAILED DESCRIPTION

[0016] 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.

[0017] Rayleigh scattering Rayleigh scattering is an optical phenomenon, a type of scattering, also known as "molecular scattering". When the particle size is much smaller than the wavelength of the incident light (less than one tenth of the wavelength), the intensity of the scattered light in each direction is different, and the intensity is inversely proportional to the fourth power of the wavelength of the incident light. This phenomenon is called Rayleigh scattering.

[0018] Rayleigh scatterer Rayleigh scatterer is an optical device based on the Rayleigh scattering principle, which is mainly used for scattering and homogenizing light.

[0019] The particles that form Rayleigh scattering in the Rayleigh scattering plate include: Metal oxides (such as SiO 2 、TiO 2 , ZnO); Metal nanoparticles (such as Au, Ag); Carbon-based nanomaterials (e.g., carbon nanotubes, graphene); Semiconductor nanoparticles (such as quantum dots); Other inorganic nanoparticles (such as Si3 N 4 、Al 2 O 3 ).

[0020] Anti-blue light additives For absorbing blue light, substances with naphthalene rings, anthracene rings, porphyrin rings, benzoxazoles, anthraquinones and benzazapyrroles in their molecular structures are used. Naphthalene rings include naphthalene; anthracene rings include anthracene; porphyrin rings include tetraphenylporphyrin; benzoxazoles include 2-phenylbenzoxazole; anthraquinones include anthraquinone; and benzazapyrroles include indole.

[0021] Bluing agent The bluing agent is a solvent dye 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, Macrolex (registered trademark) Blue RR (manufactured by Bayer), Macrolex (registered trademark) Blue 3R (manufactured by Baver), 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) can be cited.

[0022] Initiator Used in MMA polymerization reaction, including one or more of azobisisobutyronitrile, azobisisoheptanenitrile, and dibenzoyl peroxide.

[0023] Release agent In the production process of PMMA (polymethyl methacrylate), silicone oil and fluorine-based release agents are the most commonly used additives to improve the demoulding efficiency of the product. Silicone oil, for example, is polydimethylsiloxane.

[0024] glue 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.

[0025] 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.

[0026] 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.

[0027] The crosslinking agent includes one or more of 1,4-butanediol dimethacrylate, ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, divinylbenzene, trimethoxypropane trimethacrylate methyl, pentaerythritol triacrylate, hydroxyethyl acrylate, glycidyl acrylate, and dipropylene glycol diacrylate.

[0028] 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.

[0029] Unless otherwise specified, the raw materials in the following examples and comparative examples in this application were purchased from the market.

[0030] All percentages in this application are weight percentages.

[0031] In the present application, the transmittance is measured using an ultraviolet spectrophotometer at 350-500 nm.

[0032] In this application, the Rayleigh scattering effect measurement method is: (1) In a dark room, irradiate a 350-500 nm light source vertically onto the plate. 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.

[0033] (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).

[0034] Example 1 A composite board is provided, the composite board being Figure 1 As shown, it comprises 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.

[0035] The preparation method of the filter layer is as follows: Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to a mixing tank; Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes; After vacuum degassing, place the Ruili scattering plate on the mold and place a sealing strip, 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 composite plate including the Rayleigh scattering layer 10 and the filter layer 20 is obtained by high temperature setting at 100-130°C, cooling and opening the mold. The filter layer 20 is combined with the Rayleigh scattering layer 10 as a whole during curing, and the total thickness is 5 mm.

[0036] 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%.

[0037] Comparative Example 1 Firstly, 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.

[0038] Preparation of Rayleigh scattering plate: (1) Mixing the crushed PMMA, anthraquinone and titanium dioxide nanoparticles uniformly; (2) After the mixed material is melted, it is extruded, kneaded and pelletized to obtain a masterbatch; (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.

[0039] Comparative Example 2 Firstly, a masterbatch raw material ratio is provided, including 99.5% of PMMA and 0.5% of titanium dioxide nanoparticles, and the particle size of the titanium dioxide nanoparticles is 5-40nm.

[0040] Preparation of Rayleigh scattering plate: (1) Mixing the crushed PMMA and titanium dioxide nanoparticles uniformly; (2) After the mixed material is melted, it is extruded, kneaded and pelletized to obtain a masterbatch; (3) The masterbatch is made into a Ruili scattering plate through an injection molding process with a thickness of 3 mm.

[0041] The performance of the plates of Example 1 and Comparative Examples 1 and 2 was evaluated respectively for their transmittance in the blue-violet light band of 380-500 nm and the Rayleigh scattering effect. The results are shown in Table 1.

[0042]

[0043] As can be seen from Table 1, since a trace amount of anthraquinone is added to Comparative Example 1 compared to Comparative Example 2, anthraquinone is used as a blue light absorber, so that after the light passes through the plate of Comparative Example 1, the light transmittance is greatly reduced, and the ratio of the average intensity of scattered light to the intensity of incident light is also extremely low. At the same time, it is observed during the test that the plate of Comparative Example 1 has a high transparency and low blueness during the test; while Example 1 is based on the existing polymethyl methacrylate plate, and anthraquinone is added in an amount equal to that of Comparative Example 1 to form a filter layer on the plate of Comparative Example 2, and the light transmittance is also greatly reduced, but the ratio of the average intensity of scattered light to the intensity of incident light is not greatly reduced. At the same time, it is observed during the test that Example 1 can still present a comfortable visual blueness during the test. It shows that after anthraquinone is used as a blue light absorber to form a filter layer and is compounded with a Rayleigh scattering layer, while ensuring the Rayleigh function effect of the Rayleigh scattering layer, part of the blue light can be further absorbed and filtered out, and the transmittance of blue light when the Rayleigh scattering plate is applied to the blue sky lamp is reduced, which plays a role in protecting human eyes and improving the practicality and safety of the blue sky lamp.

[0044] Example 2 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 adapt to the anthraquinone.

[0045] Example 3 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 adapt to the anthraquinone.

[0046] Example 4 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 adapt to the anthraquinone.

[0047] Example 5 The difference between the composite board in this embodiment and the composite board 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.

[0048] Example 6 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.

[0049] Example 7 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.

[0050] Comparative Example 3 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 adapt to the anthraquinone.

[0051] The performance of the plates of Examples 2 to 7 and Comparative Example 3 was evaluated for light transmittance and Rayleigh scattering effect in the 380-500nm blue-violet light band. The results are shown in Table 2.

[0052]

[0053] 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 transmittance, and the ratio of the average intensity of scattered light to the intensity of incident light also decreases. Although the scattered light can still be detected to meet the light intensity conditions of Rayleigh scattering, the blueness of the plate in Comparative Example 3 is significantly reduced and it is also yellowish, especially under non-test conditions (the plate is placed under natural light conditions), the yellowing of the filter layer is more obvious. 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 the test. Therefore, in order to ensure that the composite board of the present application can be applied to lighting products and ensure the functionality of its blue sky lamp, it is necessary to limit the amount of anthraquinone added in the filter layer to 0.01%~1%; and in order to ensure that the blue sky lamp better simulates the effect of the blue sky, the amount of anthraquinone added should not exceed 0.5%, and in order to ensure the control of the blue light transmittance, the amount of anthraquinone added should not be less than 0.05%, that is, the amount of anthraquinone added in the filter layer is more preferably 0.05%~0.5%.

[0054] Example 8 The difference between the composite plate in this embodiment and that in Embodiment 7 is that anthraquinone is replaced by naphthalene.

[0055] Example 9 The difference between the composite plate in this embodiment and that in Embodiment 7 is that anthraquinone is replaced by anthracene.

[0056] Example 10 The difference between the composite plate in this embodiment and that in Embodiment 7 is that anthraquinone is replaced by tetraphenylporphyrin.

[0057] Embodiment 11 The difference between the composite board in this embodiment and that in Embodiment 7 is that anthraquinone is replaced by 2-phenylbenzoxazole.

[0058] Example 12 The difference between the composite board in this embodiment and that in Embodiment 7 is that anthraquinone is replaced by indole.

[0059] The performance of the plates of Examples 8 to 12 was evaluated respectively for their transmittance in the blue-violet light band of 380 to 500 nm and the Rayleigh scattering effect. The results are shown in Table 3.

[0060]

[0061] 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 Embodiment 8 in which anthraquinone is replaced by naphthalene, even under non-test conditions, the filter layer and Rayleigh scattering layer of the composite board did not show yellowing, indicating that the use of substances containing only naphthalene ring structures in the anti-blue light additive is most beneficial to the application of blue sky lamps.

[0062] The transmittance of the filter layer of Examples 7 to 12 in the blue-violet light bands of 380 nm, 400 nm, 415 nm, 450 nm, 480 nm and 500 nm was tested. The filter layer was a single layer and the preparation method was as follows: Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to a mixing tank; Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes; 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°C, cooling and opening the mold, and the thickness is 2mm.

[0063] The results are shown in Table 4.

[0064]

[0065] As can be seen from Table 4, Embodiments 8 and 9 mainly have a more significant shielding effect on light with a wavelength less than 415nm, and the shielding effect of the substance containing only a naphthalene ring structure in Embodiment 8 is better. In conjunction with Table 3, it can be found that adding a substance containing only a naphthalene ring structure in the filter layer has a very significant effect when the Rayleigh scattering composite plate is applied to the blue sky lamp, which can filter and absorb the blue light in the light, especially the short-wavelength high-energy blue light therein, and improve the protection of the human eye. On the other hand, the substance containing only a naphthalene ring structure can also overcome the yellowing phenomenon caused by adding an anti-blue light auxiliary agent in the filter layer, and ensure that the Rayleigh scattering composite plate is applied to the blue sky lamp to simulate the effect of the blue sky.

[0066] Example 13 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.

[0067] Embodiment 14 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 content of azobisisobutyronitrile and polydimethylsiloxane remains unchanged, and the MMA clinker is adjusted to adapt to the bluing agent.

[0068] Comparative Example 4 The difference between the composite plate in this embodiment and the 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.

[0069] The performance of the plates of Example 13 and Example 14 and Comparative Example 4 was evaluated in terms of light transmittance in the blue-violet light band of 380-500 nm and Rayleigh scattering effect. The results are shown in Table 5.

[0070]

[0071] It can be seen from Table 5 that when the bluing agent is added within 0.1%, it will not affect the Rayleigh scattering effect of the composite board and its. At the same time, by observing the filter layers of Example 13 and Example 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 by 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 in the filter layer, this phenomenon can be improved by adding a small amount of bluing agent, but 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 not to exceed 0.1%.

[0072] Embodiment 15 This embodiment provides another composite board and preparation method different from that of Embodiment 1.

[0073] like Figure 2 As shown, first, the plate of this embodiment includes a Rayleigh scattering layer 10, a filter layer 20 and a bonding layer 30. The Rayleigh scattering layer 10 and the filter layer 20 are bonded and fixed by the bonding layer 30 to form a composite plate, 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.

[0074] The preparation method of the filter layer is as follows: Prepare MMA clinker with a polymerization conversion rate of 10-20% and add it to a mixing tank; Add azobisisobutyronitrile, polydimethylsiloxane and anthraquinone, and stir and disperse for 20-50 minutes; 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 20 is obtained by high temperature setting at 100-130° C., cooling, and opening the mold. The thickness of the filter layer 20 is 2 mm.

[0075] 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%.

[0076] The preparation method of the composite board is as follows: The Rayleigh scattering layer 10 is placed at the bottom, and reactive glue is applied on the surface of the Rayleigh scattering layer 10; 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; After the glue is completely cured, a composite board is obtained.

[0077] The specific reaction glue is: 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.

[0078] After testing, the composite board Example 1 obtained in this embodiment has similar light transmittance and Rayleigh scattering effect.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

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 additive, and the amount of the anti-blue light additive added to the filter layer is 0.01% to 1%.

2. The filtering Rayleigh scattering composite plate according to claim 1, characterized in that: The amount of the anti-blue light agent added to the filter layer is 0.05%~0.5%.

3. The filtering Rayleigh scattering composite plate according to claim 1, characterized in that: The anti-blue light auxiliary agent is a substance having at least one of a naphthalene ring, anthracene ring, porphyrin ring, benzoxazole, anthraquinone and benzazapyrrole in its molecular structure.

4. The filtering Rayleigh scattering composite plate according to claim 3, characterized in that: The blue light protection auxiliary agent is a substance having only a naphthalene ring in its molecular structure.

5. 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 purple color.

6. The filtering Rayleigh scattering composite plate according to claim 5, characterized in that: The amount of the bluing agent added does not exceed 0.1%.

7. 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 6, 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 a sealing strip, 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 composite board is obtained by high temperature setting at 100-130°C, cooling and opening the mold.

8. 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 6, 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°C, 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.

9. The method for producing a filtering Rayleigh scattering composite plate according to claim 8, characterized in that: The glue is: 80%-90% of methyl methacrylate with a polymerization conversion rate of 10-20%, 0.1%-5% of an oxidant, 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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