Blue light-proof nanomaterial, and spectacle lens comprising same, and method of manufacturing the same

Abstract

This invention relates to a blue light blocking nanomaterial, eyeglass lenses containing the material, and a method for preparing the same. The blue light blocking nanomaterial is iron-doped titanium dioxide, with a total iron atom content of 1%-4%. The particle size of the nanomaterial is 20-50 nm. Its beneficial effects are that it can precisely filter high-energy blue light in the 400nm-430nm wavelength range without affecting the transmittance of other wavelengths, maximizing the reproduction of realistic lighting conditions. Wearing the lenses significantly alleviates symptoms of dry and itchy eyes caused by prolonged use of mobile phones and computers, thus achieving precise eye protection. Furthermore, the lens manufacturing process is simple and low-cost, showing great promise for widespread application.

Description

Technical Field

[0001] This invention relates to the field of protective materials technology, and in particular to a blue light blocking nanomaterial, an eyeglass lens containing the same, and a method for preparing the same. Background Technology

[0002] With the increasing popularity of electronic products such as computers and mobile phones, modern people's work and study are inseparable from these electronic products. Prolonged staring at electronic products can cause eye fatigue, dryness, difficulty opening the eyes, photophobia and other symptoms.

[0003] To address the aforementioned problems, blue light blocking glasses have emerged on the market. These glasses typically have special lens coatings or filter layers to filter out some blue light, thereby reducing eye fatigue and discomfort that may be caused by prolonged screen time. However, the quality of existing blue light blocking glasses varies greatly. Some glasses reduce light transmittance due to excessive blue light filtering, thus affecting the visual experience and even increasing eye strain. Furthermore, the potential harm to the eyes from blue light emitted by electronic products is mainly concentrated in the short-wavelength blue light range, typically between 400nm and 430nm. This wavelength is considered high-energy blue light and is believed to pose a significant potential hazard to the eyes. Current blue light blocking glasses on the market do not effectively filter this wavelength of blue light precisely. In other words, it is difficult for current blue light blocking glasses to accurately filter high-energy blue light. In the process of blocking blue light, they also filter visible light in the same wavelength range, making it difficult to simultaneously protect against blue light while ensuring that other light entering the eyes in a given environment remains unaffected. Furthermore, current blue light blocking glasses use a blue light blocking film to filter blue light in order to enhance the effect of blocking blue light. These lenses require more complex manufacturing processes, have high production costs, and are expensive to sell, which is not conducive to their widespread use. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a blue light blocking nanomaterial, an eyeglass lens containing the same, and a method for preparing the same, which solves the problems of poor precision blue light blocking effect and high production cost of existing blue light blocking glasses.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, embodiments of the present invention provide a blue light blocking nanomaterial, which is iron-doped titanium dioxide, wherein the total content of iron atoms is 1%-4%; the particle size of the nanomaterial is 20-50nm.

[0009] In a second aspect, embodiments of the present invention provide an eyeglass lens comprising the blue light blocking nanomaterial described in the first aspect and a polymer optical substrate; wherein the blue light blocking nanomaterial is uniformly dispersed in the polymer optical substrate, and the blue light blocking nanomaterial accounts for 1-3‰ of the mass of the polymer optical substrate.

[0010] In a preferred embodiment of the present invention, the spectacle lens is made of one or more of the following polymer optical substrates: methacrylate resin, polyurethane resin, allyl diethylene glycol dicarbonate resin, acrylate resin, and epoxy acrylate resin.

[0011] In a preferred embodiment of the present invention, the eyeglass lens further includes an ultraviolet absorber comprising 1-4‰ of the mass of the polymer optical substrate.

[0012] In a preferred embodiment of the present invention, the ultraviolet absorber of the eyeglass lens is a fat-soluble ultraviolet absorber selected from one or more of UV-326, UV-327, UV-329, UV-360, and UV-531.

[0013] In a preferred embodiment of the present invention, the spectacle lens further includes an initiator comprising 1-3‰ of the polymer optical substrate by mass; the initiator is selected from one or more combinations of bis(azobisisobutyronitrile), azobisisoheptanenitrile, benzoyl peroxide, dicumyl peroxide, ditert-butyl peroxide, diisopropyl peroxide, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphonate, methyl benzoylformate, benzoyl dimethyl ether, diphenyl ethyl ketone, α-aminealkylphenyl ketone, bisbenzoylphenylphosphine oxide, benzophenone, and isopropylthioxanthone; and a dispersion medium comprising 10-15‰ of the polymer optical substrate by mass; the dispersion medium is styrene.

[0014] In this process, colorless and transparent styrene liquid is used as a dispersion medium to fully disperse the blue light blocking nanomaterials, prevent the aggregation of blue light blocking nanomaterial particles, ensure the dispersion effect of the subsequent blue light blocking nanomaterials, and thus ensure the uniformity of the blue light blocking function of the eyeglasses. At the same time, the dispersion medium has good transparency and does not affect the color and optical properties of the final eyeglasses.

[0015] Thirdly, the present invention provides a method for preparing the eyeglass lens, comprising the following steps: S1, dispersion of anti-blue light nanomaterials: mixing anti-blue light nanomaterials with a liquid dispersion medium to obtain an anti-blue light nanomaterial dispersion; S2, first curing reaction: stirring and mixing the dispersion with a polymer optical monomer and an initiator until uniform, then vacuum degassing, placing it in a mold, reacting and curing according to a first heating program, and demolding to obtain a primary lens; S3, second curing reaction: placing the primary lens back into the mold, reacting and curing according to a second heating program to obtain an eyeglass lens containing anti-blue light nanomaterials.

[0016] As a preferred embodiment of the present invention, in the preparation method of the eyeglass lens, in S1, the mass ratio of the anti-blue light nanomaterial to the dispersion medium is 1-3:10; the mixing process of the anti-blue light nanomaterial and the dispersion medium is as follows: while stirring, the temperature is raised to 70-90℃, and then ultrasonically dispersed for 40-50 minutes.

[0017] The mass ratio of the blue light blocking nanomaterial to the dispersion medium is 1-3:10. The mixing process involves stirring while heating to 70-90℃, followed by ultrasonic dispersion for 40-50 minutes to further ensure uniform dispersion of the nanomaterial. Simultaneously, the dispersion medium, styrene, reacts with the polymer optical monomers. During the polymerization of the polymer optical monomers, the uniform distribution of the blue light blocking nanomaterials within the polymer is promoted. Furthermore, styrene itself undergoes a polymerization reaction to form transparent polystyrene, which intertwines and bonds with the polymer optical materials constituting the lens. Polystyrene possesses excellent optical properties, and its benzene rings restrict the rotational freedom of the polymer molecular chains, thereby increasing the overall rigidity of the lens material and improving its mechanical properties and thermal stability.

[0018] In a preferred embodiment of the present invention, in the method for preparing the spectacle lens, S2, the polymer optical monomer is selected from one or more of methacrylate monomers, polyurethane monomers, allyl diethylene glycol dicarbonate monomers, acrylate monomers, and epoxy acrylate monomers.

[0019] In a preferred embodiment of the present invention, in the method for preparing the spectacle lens, S2 is the first heating procedure, which is the gelation stage; and S3 is the second heating procedure, which is the post-curing stage.

[0020] The gelation stage employs a continuous, phased heating and cooling process within a relatively low temperature range. Optical monomers begin to polymerize, forming a three-dimensional network structure. The reactants gradually lose their fluidity, transforming into a semi-solid state, i.e., a gel state, providing the basic crosslinking density for the subsequent post-curing stage. The post-curing stage uses a continuous, phased heating and cooling process within a higher temperature range than the gelation stage to further increase the crosslinking density of the material. These two stages work together to achieve higher mechanical strength and thermal stability in the final spectacle lens.

[0021] Meanwhile, both stages of the curing reaction involve continuous, phased heating. By gradually increasing the temperature, the polymerization rate can be accelerated, which helps to control the molecular weight distribution and structure of the polymer, ensuring the uniform distribution of the blue light blocking nanomaterials and optimizing lens performance.

[0022] (III) Beneficial Effects

[0023] The beneficial effects of this invention are as follows: This invention provides an anti-blue light nanomaterial, an eyeglass lens containing the same, and a method for preparing the same. By using iron-doped titanium dioxide as the anti-blue light nanomaterial and uniformly dispersing it within the lens, with the total iron atom content in the nanomaterial being 1%-4%, it can precisely filter high-energy blue light in the 400nm to 430nm wavelength range, compared to existing technologies, while not affecting the transmittance of the eyeglass lens to other wavelengths, thus maximizing the reproduction of realistic light scenes. Wearing the lenses significantly alleviates symptoms of dry and itchy eyes caused by prolonged use of mobile phones and computers, thereby achieving precise eye protection. Furthermore, the lens production process is simple and low-cost, showing great promise for widespread application.

[0024] The eyeglass lens also includes an ultraviolet absorber comprising 1-4‰ of the mass of the polymer optical substrate. The ultraviolet absorber absorbs the ultraviolet rays in sunlight and fluorescent light sources, protecting the eyes from ultraviolet damage and effectively preventing the aging effect of prolonged ultraviolet environment on the lens material, thereby improving the lifespan of the lens.

[0025] In the preparation method of eyeglass lenses, before the blue light blocking nanomaterials participate in the polymerization reaction of polymer optical monomers, the blue light blocking nanomaterials are fully dispersed using a liquid dispersion medium to prevent the agglomeration of the blue light blocking nanomaterial particles and ensure the dispersion effect of the blue light blocking nanomaterials in the subsequent process. The mass ratio of blue light blocking nanomaterials to dispersion medium is 1-3:10. The mixing process of blue light blocking nanomaterials and dispersion medium involves stirring while heating to 70-90℃, followed by ultrasonic dispersion for 40-50 minutes to further ensure the uniform dispersion of nanomaterials, thereby ensuring the uniformity of the blue light blocking function of the eyeglass lenses.

[0026] Meanwhile, the reaction between the dispersion medium styrene and the polymer optical monomer can promote the uniform distribution of blue light blocking nanomaterials in the polymer during the polymerization process of the polymer optical monomer. At the same time, the reaction between styrene and the polymer optical monomer can ultimately improve the mechanical properties of the eyeglass lens.

[0027] The dispersion of blue light blocking nanomaterials is stirred and mixed evenly with polymer optical monomers and initiators, and then degassed under vacuum to improve the product quality of eyeglass lenses.

[0028] Both stages of the curing reaction involve continuous temperature increases. By gradually increasing the temperature, the polymerization rate can be accelerated step by step. This helps to control the molecular weight distribution and structure of the polymer, ensuring the uniform distribution of the blue light blocking nanomaterials and optimizing lens performance. Attached Figure Description

[0029] Figure 1 This is an EDS analysis result diagram of the blue light blocking nanomaterial prepared in Example 1 of this invention;

[0030] Figure 2 This is an EDS analysis result diagram of the blue light blocking nanomaterial prepared in Example 2 of this invention;

[0031] Figure 3 This is an EDS analysis result diagram of the blue light blocking nanomaterial prepared in Example 3 of this invention;

[0032] Figure 4 This is a spectral analysis diagram of the spectacle lens prepared in Example 4 of this invention after filtering.

[0033] Figure 5 This is a spectral analysis diagram of the spectacle lens prepared in Example 5 of this invention after filtering.

[0034] Figure 6 This is a spectral analysis diagram of the spectacle lens prepared in Example 6 of this invention after filtering.

[0035] Figure 7 This is a spectral analysis diagram of the spectacle lens prepared in Example 7 of this invention after filtering.

[0036] Figure 8 This is a spectral analysis diagram of the spectacle lens prepared in Example 8 of this invention after filtering.

[0037] Figure 9 This is a spectral analysis diagram of the spectacle lens prepared in Example 9 of this invention after filtering.

[0038] Figure 10 This is a spectral analysis diagram of the spectacle lens prepared in Comparative Example 1 of this invention after filtering. Detailed Implementation

[0039] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] This invention proposes an anti-blue light nanomaterial, an eyeglass lens containing the nanomaterial, and a method for preparing the same. It addresses the shortcomings of existing anti-blue light glasses, such as poor protective effects and high production costs. The invention uses iron-doped titanium dioxide as the anti-blue light nanomaterial, uniformly dispersed within the lens. The total iron content in the nanomaterial is 1%-4%. Compared to existing technologies, this method can precisely filter high-energy blue light in the 400nm-430nm wavelength range without affecting the lens's transmittance for other wavelengths, maximizing the reproduction of realistic lighting conditions. Wearing the glasses significantly alleviates symptoms of dry and itchy eyes caused by prolonged use of mobile phones and computers, thus achieving precise eye protection. Furthermore, the lens production process is simple and low-cost, showing great promise for widespread application.

[0041] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0042] Example 1

[0043] This embodiment provides a method for preparing blue light blocking nanomaterials, the specific steps of which are as follows:

[0044] (1) Take 250g of ultrapure water, add 30g of titanium sulfate, 10g of ferric nitrate and 50g of ethanol, stir evenly and sonicate to obtain material A.

[0045] (2) Take 250g of ultrapure water, add 10g of ammonia water and 20g of 2-aminoterephthalic acid, stir evenly and sonicate to obtain material B.

[0046] (3) Under stirring conditions, slowly add material B to material A. When milky white or yellow precipitate appears in material A, continue stirring for 30 minutes to allow material A and B to react completely.

[0047] (4) After the reaction of materials A and B is complete, the precipitate is filtered with a 1-micron filter membrane to obtain anti-blue light nanomaterials. The materials are placed in an oven and dried at 100°C for 12 hours to obtain blocky iron-doped titanium dioxide.

[0048] (5) Powdered iron ion-doped titanium dioxide nanomaterials are obtained by crushing the blocky iron ion-doped titanium dioxide with a pulverizer.

[0049] The obtained iron-titanium bimetallic oxide nanomaterials were analyzed for elemental composition using energy-dispersive X-ray spectroscopy (EDS). The results are as follows: Figure 1 As shown, the specific atomic contents of the corresponding elements are shown in Table 1.

[0050] Example 2

[0051] This embodiment provides a method for preparing blue light blocking nanomaterials, the specific steps of which are as follows:

[0052] (1) Take 300g of ultrapure water, add 35g of titanium sulfate, 15g of ferric nitrate and 60g of ethanol, stir evenly and sonicate to obtain material A.

[0053] (2) Take 300g of ultrapure water, add 13g of ammonia water and 25g of 2-aminoterephthalic acid, stir evenly and sonicate to obtain material B.

[0054] (3) Under stirring conditions, slowly add material B to material A. When milky white or yellow precipitate appears in material A, continue stirring for 40 minutes to allow material A and B to react completely.

[0055] (4) After the reaction of materials A and B is complete, the precipitate is filtered with a 1-micron filter membrane to obtain anti-blue light nanomaterials. The materials are placed in an oven and dried at 110°C for 10 hours to obtain blocky iron-doped titanium dioxide.

[0056] (5) Powdered iron ion-doped titanium dioxide nanomaterials are obtained by crushing the blocky iron ion-doped titanium dioxide with a pulverizer.

[0057] The obtained iron-titanium bimetallic oxide nanomaterials were analyzed for elemental composition using energy-dispersive X-ray spectroscopy (EDS). The results are as follows: Figure 2 As shown, the specific atomic contents of the corresponding elements are shown in Table 1.

[0058] Example 3

[0059] This embodiment provides a method for preparing blue light blocking nanomaterials, the specific steps of which are as follows:

[0060] (1) Take 350g of ultrapure water, add 40g of titanium sulfate, 20g of ferric nitrate and 70g of ethanol, stir evenly and sonicate to obtain material A.

[0061] (2) Take 350g of ultrapure water, add 16g of ammonia water and 30g of 2-aminoterephthalic acid, stir evenly and sonicate to obtain material B.

[0062] (3) Under stirring conditions, slowly add material B to material A. When milky white or yellow precipitate appears in material A, continue stirring for 50 minutes to allow material A and B to react fully.

[0063] (4) After the reaction of materials A and B is complete, the precipitate is filtered with a 1-micron filter membrane to obtain blue light blocking nanomaterials. The materials are placed in an oven and dried at 120°C for 8 hours to obtain blocky iron ion doped titanium dioxide.

[0064] (5) Powdered iron ion-doped titanium dioxide nanomaterials are obtained by crushing the blocky iron ion-doped titanium dioxide with a pulverizer.

[0065] The obtained iron-titanium bimetallic oxide nanomaterials were analyzed for elemental composition using energy-dispersive X-ray spectroscopy (EDS). The results are as follows: Figure 3 As shown, the specific atomic contents of the corresponding elements are shown in Table 1.

[0066] Table 1

[0067]

[0068] Example 4

[0069] This embodiment provides a method for preparing spectacle lenses, the specific steps of which are as follows:

[0070] (1) Add 50g of styrene and 5g of iron-doped titanium dioxide nanomaterial (prepared in Example 3) to a beaker, stir and heat to 70°C, then disperse in an ultrasonic disperser for 30 minutes to obtain a light yellow transparent nanomaterial dispersion.

[0071] (2) Add 5 kg of acrylate monomers, 5 g of initiator azobisisobutyronitrile, 5 g of ultraviolet absorber UV329 and the nanomaterial dispersion from step (1) to a mixing and pouring tank. After stirring and mixing at room temperature for 30 min, a homogeneous mixture is obtained. The homogeneous mixture is then vacuum-treated at 20°C for 30 min to remove air bubbles.

[0072] (3) Then pour the mixture after removing the air bubbles into the glass mold cavity, and transfer it into a programmed heating furnace. The gelation reaction is carried out according to the following program: the temperature is increased from room temperature to 35°C after 10 min, then increased to 38°C after 6 h, then increased to 48°C after 6 h, then increased to 73°C after 3 h, then increased to 98°C after 4 h and held for 2 h, and finally decreased to 70°C after 1 h. After the initial curing is completed, the mold is removed to obtain the primary lens.

[0073] (4) Clean the primary lens, cut the edge, and then put it back into the programmed heating oven. Follow the following program to carry out the post-curing reaction (secondary curing): heat from 30℃ to 105℃ for 3 hours and hold for 2 hours, then cool down to 30℃ for 2 hours to obtain a spectacle lens with the function of relieving dry eyes.

[0074] The transmittance of the spectacle lenses was analyzed using a UV-Vis spectrophotometer, and the results were compared with those obtained from [previous studies]. Figure 4 The surface mechanical properties of the spectacle lenses were tested, and the results are shown in Table 2.

[0075] Example 5

[0076] This embodiment provides a method for preparing spectacle lenses, which differs from Embodiment 4 in that:

[0077] In step (1), 100g of styrene and 20g of iron-doped titanium dioxide nanomaterials (prepared in Example 3) were added to a beaker. While stirring, the temperature was raised to 80°C and then dispersed in an ultrasonic disperser for 40 minutes to obtain a light yellow transparent nanomaterial dispersion.

[0078] In step (2), 10 kg of acrylate monomers, 20 g of azobisisobutyronitrile, 20 g of ultraviolet absorber UV329, and the nanomaterial dispersion from step (1) are added to a mixing and pouring tank. The mixture is stirred and mixed at room temperature for 40 min to obtain a homogeneous mixture. The remaining steps remain unchanged.

[0079] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 5 The surface mechanical properties of the spectacle lenses were tested, and the results are shown in Table 2.

[0080] Example 6

[0081] This embodiment provides a method for preparing spectacle lenses, which differs from Embodiment 4 in that:

[0082] In step (1), 150g of styrene and 45g of iron-doped titanium dioxide nanomaterials (prepared in Example 3) were added to a beaker. While stirring, the temperature was raised to 90°C and then dispersed in an ultrasonic disperser for 50 minutes to obtain a light yellow transparent nanomaterial dispersion.

[0083] In step (2), 15 kg of acrylate monomers, 45 g of azobisisobutyronitrile, 45 g of ultraviolet absorber UV329, and the nanomaterial dispersion from step (1) are added to a mixing and pouring tank. The mixture is stirred and mixed at room temperature for 40 min to obtain a homogeneous mixture. The remaining steps remain unchanged.

[0084] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 6 The surface mechanical properties of the spectacle lenses were tested, and the results are shown in Table 2.

[0085] Example 7

[0086] This embodiment provides a method for preparing spectacle lenses, which differs from Embodiment 4 in that:

[0087] In step (2), 5 kg of epoxy acrylate monomers, 5 g of azobisisobutyronitrile, 5 g of ultraviolet absorber UV329 and the nanomaterial dispersion from step (1) are added to a mixing and pouring tank. After stirring and mixing at room temperature for 30 min, a homogeneous mixture is obtained.

[0088] In step (3), the bubble-free mixture is then poured into the glass mold cavity and transferred to a programmed temperature furnace for curing according to the following temperature program: 37℃ for 30 min, 45℃ for 1.5 h, 55℃ for 7 h, 65℃ for 6 h, 75℃ for 2 h, 105℃ for 3 h, and 78℃ for constant temperature; after curing, the mold is removed to obtain the primary lens. The remaining steps remain unchanged.

[0089] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 7 The surface mechanical properties of the spectacle lenses were tested, and the results are shown in Table 2.

[0090] Example 8

[0091] This embodiment provides a method for preparing spectacle lenses, which differs from Embodiment 7 in that:

[0092] In step (1), 100g of styrene and 20g of iron-doped titanium dioxide nanomaterials (prepared in Example 3) were added to a beaker. While stirring, the temperature was raised to 80°C and then dispersed in an ultrasonic disperser for 40 minutes to obtain a light yellow transparent nanomaterial dispersion.

[0093] In step (2), 10 kg of epoxy acrylate monomers, 20 g of azobisisobutyronitrile, 20 g of ultraviolet absorber UV329, and the nanomaterial dispersion from step (1) are added to a mixing and casting tank. The mixture is stirred and mixed at room temperature for 40 min to obtain a homogeneous mixture. The remaining steps remain unchanged.

[0094] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 8 The surface mechanical properties of the finished spectacle lenses were tested, and the test results are shown in Table 2.

[0095] Example 9

[0096] This embodiment provides a method for preparing spectacle lenses, which differs from Embodiment 7 in that:

[0097] In step (1), 150g of styrene and 45g of iron-doped titanium dioxide nanomaterials (prepared in Example 3) were added to a beaker. While stirring, the temperature was raised to 90°C and then dispersed in an ultrasonic disperser for 50 minutes to obtain a light yellow transparent nanomaterial dispersion.

[0098] In step (2), 15 kg of epoxy acrylate monomers, 45 g of azobisisobutyronitrile, 45 g of ultraviolet absorber UV329, and the nanomaterial dispersion from step (1) are added to a mixing and pouring tank. The mixture is stirred and mixed at room temperature for 40 min to obtain a homogeneous mixture. The remaining steps remain unchanged.

[0099] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 9 The surface mechanical properties of the finished spectacle lenses were tested, and the test results are shown in Table 2.

[0100] Comparative Example 1

[0101] This comparative example provides a method for preparing an eyeglass lens, which differs from Example 4 in that:

[0102] In step (1), 5g of iron-doped titanium dioxide nanomaterials were replaced with a mixture of iron oxide nanopowder and titanium dioxide nanopowder, wherein the ratio of iron to titanium atoms in the iron oxide and titanium dioxide was consistent with the ratio of iron to titanium atoms in the iron-doped titanium dioxide nanomaterials in Example 4. The remaining steps remained unchanged.

[0103] The light transmittance of the light beam transmitted through the finished eyeglass lenses was analyzed using a UV-Vis spectrophotometer. The results were referenced... Figure 10 .

[0104] Comparative Example 2

[0105] This comparative example provides a method for preparing eyeglass lenses, which differs from Example 4 in that: in step (1), the dispersion medium styrene is replaced with methyl methylpropionate.

[0106] The final product of the eyeglass lenses contained granular regions, rendering them unusable. This was because methyl methacrylate, used as a dispersion medium, failed to effectively disperse the iron-doped titanium dioxide nanomaterials, leading to agglomeration of the nanomaterials.

[0107] Comparative Example 3

[0108] This comparative example provides a method for preparing an eyeglass lens, which differs from Example 4 in that step (3) is omitted, and the lens cannot be formed.

[0109] The surface mechanical properties of the finished eyeglass lenses were tested, and the test results are shown in Table 2.

[0110] Table 2: Test Results of Lens Surface Mechanical Properties

[0111]

[0112] Note: In Table 2, the technical requirements for compressive strength are as follows: After testing according to the method specified in ISO 12312-1, the lens should not shatter or deform; the impact resistance performance is tested according to the method specified in QB / T2506-2017, and the lens should not exhibit any of the following conditions to be considered compliant: 1. The lens breaks into two or more pieces; 2. Fragments fall off from the near-eye surface of the lens; 3. The lens is penetrated from between; the technical requirement for surface hardness is 30±2.

[0113] Based on the above embodiments and comparative examples, it can be concluded that:

[0114] Example 4 is the best embodiment. Referring to Table 2, when the doping ratio of iron atoms is 3.43%, the eyeglass lens prepared with the iron-titanium bimetallic oxide nanomaterial of this ratio has an absorption rate of 100% for ultraviolet light and a high absorption rate of over 99% for high-frequency blue light (400nm to 430nm). It can effectively filter out the damage to the eyes caused by blue light from electronic products and prevent the occurrence of a series of eye diseases such as dry eye syndrome.

[0115] A comparison of Examples 4, 5, and 6 shows that increasing the amount of iron-titanium bimetallic oxide nanomaterials, i.e., increasing the mass ratio of iron-titanium bimetallic oxide nanomaterials to monomers, leads to better results. Figure 4 , Figure 5 and Figure 6 Increasing the amount of nanomaterials added will affect the transmittance of the final eyeglass lens for visible light in the 500nm to 700nm wavelength range. Therefore, it is necessary to control the amount of iron-titanium bimetallic oxide nanomaterials added. The optimal mass ratio of iron-titanium bimetallic oxide nanomaterials to monomers is 1:1000.

[0116] A comparison of Examples 4 to 6 with Examples 7-9 shows that, with reference to Figures 4 to 9 Epoxy acrylate monomer-based eyeglass lenses have slightly lower transmittance and surface hardness in the visible light range of 450-550 nm compared to lenses made with acrylate monomers. Therefore, the light transmittance and mechanical properties of eyeglass lenses made with epoxy acrylate monomers are inferior to those of lenses made with acrylate monomers.

[0117] Comparing Comparative Example 1 and Example 4, it can be seen that using an equal amount of iron oxide nanopowder and titanium dioxide nanopowder to prepare spectacle lenses, as in Example 4 with iron ion-doped titanium dioxide nanomaterials, is more effective. Figure 10 Its transmittance of visible light in the 450-650nm range is significantly reduced, which will affect the normal use of eyeglass lenses. Therefore, the iron-doped titanium dioxide nanomaterial in Example 4 can effectively avoid the impact on the color of eyeglass lenses caused by directly using iron oxide nanopowder.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an eyeglass lens, characterized in that, The eyeglass lens comprises blue light blocking nanomaterials, a dispersion medium, and a polymer optical substrate; The aforementioned blue light blocking nanomaterial is iron-doped titanium dioxide, wherein the total content of iron atoms is 3.43%. The particle size of the nanomaterial is 20-50 nm; The polymer optical substrate is an acrylic resin; The blue light blocking nanomaterial is uniformly dispersed in the polymer optical substrate, wherein the blue light blocking nanomaterial accounts for 1-3‰ of the mass of the polymer optical substrate; The dispersion medium is styrene, the mass ratio of the blue light blocking nanomaterial to the dispersion medium is 1:10, and the dispersion medium accounts for 10-15‰ of the mass of the polymer optical substrate. The preparation method of the blue light blocking nanomaterial includes the following steps: Step 1: Take 350g of ultrapure water, add 40g of titanium sulfate, 20g of ferric nitrate and 70g of ethanol, stir evenly and then sonicate to obtain material A; Step 2: Take 350g of ultrapure water, add 16g of ammonia water and 30g of 2-aminoterephthalic acid, stir evenly and then sonicate to obtain material B; Step 3: Under stirring conditions, slowly add component B to component A. When a milky white or yellow precipitate appears in component A, continue stirring for 50 minutes to allow component A and component B to react fully. Step 4: After the reaction of materials A and B is complete, the precipitate is filtered through a 1-micron filter membrane to obtain blue light blocking nanomaterials. The materials are then placed in an oven and dehydrated at 120°C for 8 hours to obtain blocky iron-doped titanium dioxide. Step 5: Pulverize the blocky iron-doped titanium dioxide using a pulverizer to obtain powdered iron-doped titanium dioxide blue light blocking nanomaterials. The method for preparing the spectacle lens includes the following steps: S1. Dispersion of blue light blocking nanomaterials: The blue light blocking nanomaterials are mixed with a liquid dispersion medium to obtain a blue light blocking nanomaterial dispersion. The mixing process of the blue light blocking nanomaterials and the dispersion medium is as follows: while stirring, the temperature is raised to 70-90℃, and then ultrasonically dispersed for 40-50 minutes. S2. First curing reaction: The dispersion is stirred and mixed evenly with the polymer optical monomer and initiator, then vacuum degassing is performed, the mixture is poured into the mold, and the reaction is cured according to the first heating program. The primary lens is then demolded. S3. Second curing reaction: The primary lens is put back into the mold and cured according to the second heating program to obtain eyeglass lenses containing anti-blue light nanomaterials.

2. The method for preparing spectacle lenses as described in claim 1, characterized in that, It also includes an ultraviolet absorber comprising 1-4‰ of the mass of the polymer optical substrate.

3. The method for preparing spectacle lenses as described in claim 2, characterized in that, The ultraviolet absorber is a fat-soluble ultraviolet absorber, selected from one or more of UV-326, UV-327, UV-329, UV-360, and UV-531.

4. The method for preparing spectacle lenses as described in claim 1, characterized in that, It also includes an initiator accounting for 1-3‰ of the mass of the polymer optical substrate; The initiator is selected from one or more combinations of bis(II,III)-isobutyronitrile, azobis(II,III)-heptanenitrile, benzoyl peroxide, dicumyl peroxide, ditert-butyl peroxide, diisopropyl peroxide dicarbonate, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphine, methyl benzoylformate, benzoyl dimethyl ether, diphenyl ethyl ketone, α-aminealkylphenyl ketone, bisbenzoylphenylphosphine oxide, benzophenone, and isopropylthioxanthrone.

5. The method for preparing spectacle lenses as described in claim 1, characterized in that, In S2, the polymer optical monomer is an acrylate monomer.

6. The method for preparing spectacle lenses as described in claim 1, characterized in that, In S2, the first heating procedure is the gelation stage; In S3, the second heating process is the post-curing stage.

7. The method for preparing spectacle lenses as described in claim 6, characterized in that, In S2, the first heating program is as follows: from room temperature, the temperature is increased to 35°C in 10 minutes, then to 38°C in 6 hours, then to 48°C in 6 hours, then to 73°C in 3 hours, then to 98°C in 4 hours and held for 2 hours, and finally cooled down to 70°C in 1 hour.

8. The method for preparing spectacle lenses as described in claim 6, characterized in that, In S2, the first heating program is as follows: 37℃ for 30 min, 45℃ for 1.5 h, 55℃ for 7 h, 65℃ for 6 h, 75℃ for 2 h, 105℃ for 3 h, and finally 78℃ for constant temperature.

9. The method for preparing an eyeglass lens according to any one of claims 6 to 8, characterized in that, In S2, the second heating program is as follows: from 30℃ to 105℃ in 3 hours, hold for 2 hours; then cool down to 30℃ in 2 hours.

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