Spectacle lens capable of preventing microwave radiation and blue light and preparation method of spectacle lens

Abstract

The invention discloses an anti-microwave-radiation and anti-blue-light spectacle lens and a preparation method thereof, and belongs to the technical field of optical lenses, the anti-microwave-radiation and anti-blue-light spectacle lens is structurally divided into three layers, namely an anti-blue-light layer, a water-resistant antifouling layer and an anti-microwave-radiation layer from bottom to top in sequence, through a special synergistic relationship among the three layers, the interface bonding is good, and the anti-microwave-radiation and anti-blue-light spectacle lens is not easy to peel off; in addition, good microwave radiation prevention and blue light prevention effects are achieved, oil contamination can be prevented, adhesion of rainwater can be avoided when the waterproof and anti-glare film is used in rainy days, and the sight is prevented from being influenced; the prepared antifouling layer contains pyridine groups, the pyridine groups and cobalt metal ions of the ZIF-8 / ferric oxide composite fibers in the microwave radiation prevention layer can easily form coordinate bonds, pyridine group doping is formed, the dielectric loss angle tangent of ZIF-8 is low, and the consumption efficiency of microwave electric field energy is limited. The doping coordination of pyridine groups can promote the formation of active sites, enhance dipole polarization and interface polarization, and improve the microwave radiation resistance of the microwave radiation resistance layer.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology, specifically a spectacle lens that protects against microwave radiation and blue light, and its preparation method. Background Technology

[0002] With the rapid development of electronic information technology, various electronic devices (such as smartphones, computers, 5G communication base stations, microwave ovens, etc.) have been widely integrated into daily work and life. The potential harm of blue light and microwave radiation they generate to human eye health is becoming increasingly prominent. Long-term exposure to blue light can lead to eye fatigue and dryness, and in severe cases, may damage the macula of the retina. Microwave radiation, under long-term exposure, may affect the physiological function of eye tissues, posing a potential risk, especially to people who frequently come into contact with communication devices and medical instruments. At the same time, eyeglass lenses, as a key daily wear accessory, are easily contaminated with oil and dust during use. When used in rainy weather, rainwater adheres to the lens surface and forms a water film, seriously affecting visual clarity and even causing safety hazards. Therefore, water resistance and stain resistance have become important practical requirements for eyeglass lenses.

[0003] To meet the aforementioned protection needs, existing technologies have developed single-function eyeglass lenses. For example, blue light blocking lenses are made by adding metal oxides or MOF materials, or microwave radiation blocking lenses are made by using magnetic particles and dielectric materials. Meanwhile, some products achieve basic anti-fouling effects by coating their surfaces with hydrophobic coatings. However, existing technologies have significant limitations: Firstly, single-function products cannot simultaneously address the dual threats of blue light and microwave radiation. The few products that attempt to integrate microwave and blue light blocking functions often use simple layering methods, lacking design considerations for the interfacial synergy of each functional layer. This results in weak interlayer bonding, making them prone to peeling after prolonged wear or wiping, severely impacting product lifespan. Secondly, existing multi-functional eyeglass lenses often struggle to balance core protective performance with water and stain resistance. Some products, in order to enhance protection, neglect anti-fouling design, or use anti-fouling coatings with poor compatibility with the protective layer, leading to reduced protective performance and short-lasting anti-fouling effects. The problems of rainwater adhesion and difficulty in cleaning oil stains remain unresolved. Therefore, developing an integrated eyeglass lens that combines stable protection against microwave radiation and blue light, with strong interlayer bonding and excellent water and stain resistance, has become an urgent need in the industry.

[0004] Existing eyeglass lenses that integrate microwave radiation protection and blue light protection are mostly simple superpositions of functional layers, lacking interlayer synergy design. This results in insufficient interfacial bonding, making them prone to interlayer delamination during long-term use. This not only affects the protective effect but also shortens the product's lifespan. Summary of the Invention

[0005] The purpose of this invention is to provide an eyeglass lens with microwave radiation protection and blue light protection, and a method for preparing the same. Structurally, it consists of three layers: from bottom to top, an anti-blue light layer, a water-resistant and stain-resistant layer, and an anti-microwave radiation layer. The special synergistic relationship between the three layers ensures good interfacial bonding, making them difficult to peel off. It also provides good protection against microwave radiation and blue light, and is oil-resistant. When used in rainy weather, it prevents rainwater from adhering and thus avoids affecting vision.

[0006] The objective of this invention can be achieved through the following technical solutions: A method for preparing a spectacle lens that protects against microwave radiation and blue light includes the following steps: Step 1: Using hexadecyltrimethylammonium bromide as a surfactant, a micelle template is formed in ammonia water. Tetraethyl orthosilicate is used as the silicon source. After hydrolysis and condensation, the template is removed by isopropanol and ammonium nitrate to obtain silica particles. With silica particles as the core, hexadecyltrimethylammonium bromide forms a local micelle template. Tetraethyl orthosilicate is hydrolyzed and condensed under urea assistance to form a burr-like silicon layer to obtain burr-like silica powder.

[0007] Step 2: Using 5-hydroxyisophthalic acid as a ligand, chromium nitrate is hydrothermally coordinated to grow a chromium-based metal-organic framework in situ on the surface of burred silica to obtain chromium MOF / burred silica powder; the chromium MOF / burred silica powder is then sprayed onto an eyeglass lens to obtain an eyeglass lens containing a blue light blocking layer.

[0008] Step 3: A polymer network is formed by initiating the formation of double bonds in the structures of polymethyl methacrylate-b-4-vinylpyridine, vinyl POSS, methyl methacrylate, and methacrylic acid. Then, the eyeglass lens containing the blue light blocking layer is immersed in the polymer network to form a water-resistant and stain-resistant layer.

[0009] Step 4: Ferrous chloride reacts with sodium thiosulfate under alkaline conditions to produce ferrous oxide, which then coordinates with 2-methylimidazole and cobalt nitrate hexahydrate to form ZIF-8. ZIF-8 is then electrospun with polyacrylonitrile as the fiber-forming matrix to obtain ZIF-8 / ferrous oxide composite fiber. The ZIF-8 / ferrous oxide composite fiber is then sprayed onto a water-resistant and stain-resistant layer to form a microwave radiation protection layer, resulting in eyeglass lenses that protect against microwave radiation and blue light.

[0010] Furthermore, the specific preparation steps for silica particles are as follows: Hexadecyltrimethylammonium bromide and ammonia were added to a reaction vessel and stirred for 30-40 min at 20-25 °C and 500-600 r / min. Then tetraethyl orthosilicate was added and the reaction was continued for 6-7 h. The mixture was centrifuged at 8000-9000 r / min for 5-8 min, and the filter cake was transferred to isopropanol and ammonium nitrate. The mixture was reacted at 80-90 °C for 24-26 h and then freeze-dried under vacuum at -20 °C for 12-14 h to obtain silica particles.

[0011] Furthermore, the ratio of hexadecyltrimethylammonium bromide, ammonia, tetraethyl orthosilicate, isopropanol, and ammonium nitrate is 30-35g: 2-3L: 170-180mL: 1.5-2L: 14-16g.

[0012] Furthermore, the specific preparation steps for the burr-like silica powder are as follows: Hexadecyltrimethylammonium bromide, urea, silica particles, and deionized water were added to a reaction vessel and stirred for 30-40 minutes at 20-25°C and 500-600 rpm. Then, isopropanol and tetraethyl orthosilicate were added, and stirring was continued for another 30-40 minutes. The mixture was then heated to 70-80°C and reacted for 16-18 hours. After filtration, the filter cake was washed 2-4 times with deionized water and dried under vacuum at 60-80°C for 1-2 hours. The cake was then transferred to a muffle furnace and calcined at 550-600°C for 6-8 hours to obtain burr-like silica powder.

[0013] Furthermore, the ratio of hexadecyltrimethylammonium bromide, urea, silica particles, deionized water, isopropanol, and tetraethyl orthosilicate is 20-22g: 12-20g: 8-10g: 450-500mL: 16-20mL: 4-8mL.

[0014] Furthermore, the specific preparation steps for chromium MOF / burred silica powder are as follows: Add spiky silica powder, 5-hydroxyisophthalic acid, and deionized water to a reaction vessel. Dissolve sodium hexadecyl sulfate in 50-60 wt% ethanol solution and add it to the reaction vessel. Stir at 100-110℃ and 400-500 r / min for 1-2 h. Then add chromium nitrate and continue stirring for 24-26 h. Filter the mixture and wash the filter cake 2-4 times with deionized water and anhydrous ethanol, respectively. Dry the cake under vacuum at 60-80℃ for 1-2 h to obtain chromium MOF / spiky silica powder.

[0015] Furthermore, the ratio of the amounts of burr-like silica powder, 5-hydroxyisophthalic acid, deionized water, sodium hexadecyl sulfate, ethanol solution, and chromium nitrate is 15-20g: 20-25g: 800-900mL: 2-3g: 120-140mL: 10-11g.

[0016] Furthermore, the specific preparation steps for the blue light blocking layer on the eyeglass lens are as follows: The lens substrate is ultrasonically cleaned in deionized water for 40-60 minutes and vacuum dried at 60-80℃ for 1-2 hours. Then, chromium MOF / burred silica powder is sprayed onto the lens substrate to obtain a lens containing a blue light blocking layer with a thickness of 500-600nm.

[0017] Furthermore, the specific preparation steps for the water-resistant and antifouling layer are as follows: Methyl methacrylate, polymethyl methacrylate-b-4-vinylpyridine, methacrylic acid, vinyl POSS, and deionized water are added to a reaction vessel and stirred for 30-40 minutes at 20-25°C and 500-600 rpm. Then, sodium dodecyl sulfate and ammonium persulfate are added, and the mixture is heated to 80-90°C to obtain a mixed solution. The spectacle lens containing the blue light blocking layer is then immersed in the mixed solution, and the reaction continues for 1-2 hours. The spectacle lens is then removed and vacuum dried at 60-80°C for 1-2 hours to form a water-resistant and stain-resistant layer with a thickness of 100-200 nm.

[0018] Furthermore, the ratio of methyl methacrylate, polymethyl methacrylate-b-4-vinylpyridine, methacrylic acid, vinyl POSS, deionized water, sodium dodecyl sulfate, and ammonium persulfate is 15-20g: 17-19g: 16-17g: 5-7g: 250-300mL: 3-4g: 1-2g.

[0019] Furthermore, the specific preparation steps of ZIF-8 / iron oxide composite fiber are as follows: Sodium thiosulfate, ferrous chloride, sodium hydroxide, and deionized water were added to a reaction vessel and stirred for 5-6 hours at 200-220℃ and 500-600 r / min to obtain ferrous oxide. Then, ferrous oxide, 2-methylimidazole, cobalt nitrate hexahydrate, polyacrylonitrile, and N,N-dimethylformamide were added to the reaction vessel and stirred for 30-40 minutes at 20-25℃ and 500-600 r / min. The mixture was then transferred to a syringe and electrospun under experimental conditions of an applied voltage of 20-22 kV, a feed rate of 3-4 mm / h, and a receiving distance of 18-20 cm to obtain ZIF-8 / ferrous oxide composite fibers.

[0020] Furthermore, the ratio of sodium thiosulfate, ferrous chloride, sodium hydroxide, and deionized water is 3-4g: 10-12g: 4-6g: 120-140mL.

[0021] Furthermore, the ratio of ferrous oxide, 2-methylimidazole, cobalt nitrate hexahydrate, polyacrylonitrile, and N,N-dimethylformamide is 2-4g: 2-3g: 3-5g: 18-25g: 250-300mL.

[0022] Furthermore, the specific manufacturing steps for eyeglass lenses that protect against microwave radiation and blue light are as follows: ZIF-8 / iron oxide composite fiber is sprayed onto a water-resistant and stain-resistant layer to form a microwave radiation protection layer with a thickness of 200-300nm, resulting in eyeglass lenses that protect against microwave radiation and blue light.

[0023] The beneficial effects of this invention are: 1. The eyeglass lens prepared by this invention is divided into three layers in terms of structure: from bottom to top, it consists of an anti-blue light layer, a water-resistant and stain-resistant layer, and an anti-microwave radiation layer. The special synergistic relationship between the three layers makes their interfaces well bonded and not easy to peel off. It has good anti-microwave radiation and anti-blue light effects, and can also prevent oil stains. When used in rainy weather, it can prevent rainwater from sticking and avoid affecting vision.

[0024] 2. The blue light protection layer prepared by this invention is a chromium MOF structure synthesized on the surface of burr-shaped silica powder by hydrothermal synthesis. It utilizes the characteristic absorption of harmful blue light by rare earth ion chromium, combined with the Mie scattering effect of burr-shaped silica, to achieve a dual protection effect of absorption and scattering, avoiding the decrease in light transmittance caused by single scattering. The burr-shaped structure at the bottom layer can significantly improve the mechanical interlocking effect with the second layer and improve the interfacial bonding force.

[0025] 3. The water-resistant and antifouling layer prepared by the present invention is a polymer network initiated by polymethyl methacrylate-b-4-vinylpyridine, vinyl POSS, methyl methacrylate and methacrylic acid. It has good hydrophobic effect. As an intermediate layer, it can increase the adhesion between the blue light protection layer and the microwave radiation protection layer due to its excellent bonding strength, and avoid coating peeling.

[0026] 4. The microwave radiation shielding layer prepared by this invention is formed by spraying ZIF-8 / iron oxide composite fibers onto a water-resistant and anti-fouling layer. Using polyacrylonitrile as the fiber-forming matrix, a three-dimensional network structure is formed by interweaving iron oxide and ZIF-8 as magnetic semiconductor materials, which constructs a continuous magnetic and electrical conduction path, enhances eddy current loss and hysteresis loss. The special design of this layer is conducive to a tight bond with the water-resistant and anti-fouling layer.

[0027] 5. The antifouling layer prepared by this invention contains pyridine groups. Pyridine groups can act as strong ligands for transition metal ions and as Lewis base groups, readily forming coordination bonds with cobalt metal ions in the ZIF-8 / iron oxide composite fibers of the microwave radiation shielding layer, thus forming pyridine group doping. ZIF-8 has a low dielectric loss tangent, limiting its efficiency in consuming microwave electric field energy. The doping and coordination of pyridine groups can promote the formation of active sites, enhance dipole polarization and interfacial polarization, and improve the microwave radiation shielding performance of the microwave radiation shielding layer. Attached Figure Description

[0028] Figure 1 This is a transmission electron microscope image of the burr-like silica powder in Example 3.

[0029] Figure 2 This is a scanning electron microscope image of the ZIF-8 / iron oxide composite fiber in Example 3.

[0030] Figure 3 The N2 adsorption-desorption curves for chromium MOF / burred silica powder and burred silica powder in Example 3 are shown.

[0031] Figure 4 The pore size distribution diagrams for chromium MOF / burred silica powder and burred silica powder in Example 3 are shown. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: A method for preparing a spectacle lens that protects against microwave radiation and blue light, comprising the following steps: S1: Add 30g of hexadecyltrimethylammonium bromide and 2L of ammonia water to a reaction vessel, stir for 30min at 20℃ and 500r / min, then add 170mL of tetraethyl orthosilicate, continue the reaction for 6h, centrifuge at 8000r / min for 5min, transfer the filter cake to 1.5L of isopropanol and 14g of ammonium nitrate, react at 80℃ for 24h, and freeze-dry under vacuum at -20℃ for 12h to obtain silica particles.

[0034] S2: Add 20g hexadecyltrimethylammonium bromide, 12g urea, 8g silica granules and 450mL deionized water to a reaction vessel, stir for 30min at 20℃ and 500r / min, then add 16mL isopropanol and 4mL tetraethyl orthosilicate, continue stirring for 30min, heat to 70℃, continue the reaction for 16h, filter, wash the filter cake twice with deionized water, vacuum dry at 60℃ for 1h, transfer to a muffle furnace, heat to 550℃ and calcine for 6h to obtain burr-like silica powder.

[0035] S3: Add 15g of burr-like silica powder, 20g of 5-hydroxyisophthalic acid and 800mL of deionized water to a reaction vessel. Dissolve 2g of sodium hexadecyl sulfate in 120mL of 50wt% ethanol solution and add it to the reaction vessel. Stir at 100℃ and 400r / min for 1h. Then add 10g of chromium nitrate and continue stirring for 24h. Filter the mixture and wash the filter cake twice with deionized water and anhydrous ethanol, respectively. Dry it under vacuum at 60℃ for 1h to obtain chromium MOF / burr-like silica powder.

[0036] S4: Place the eyeglass substrate in deionized water for ultrasonic cleaning for 40 minutes, vacuum dry at 60°C for 1 hour, and then spray chromium MOF / burred silica powder onto the eyeglass substrate to obtain an eyeglass lens with a 500nm thick anti-blue light layer.

[0037] S5: Add 15g of methyl methacrylate, 17g of polymethyl methacrylate-b-4-vinylpyridine, 16g of methacrylic acid, 5g of vinyl POSS and 250mL of deionized water to a reaction vessel and stir for 30min at 20℃ and 500r / min. Then add 3g of sodium dodecyl sulfate and 1g of ammonium persulfate and heat to 80℃ to obtain a mixed solution. Immerse the eyeglass lens containing the blue light blocking layer in the mixed solution and continue the reaction for 1h. Remove the eyeglass lens and vacuum dry it at 60℃ for 1h to form a water-resistant and anti-fouling layer with a thickness of 100nm.

[0038] S6: Add 3g sodium thiosulfate, 10g ferrous chloride, 4g sodium hydroxide and 120mL deionized water to a reaction vessel and stir for 5h at 200℃ and 500r / min to obtain ferrous oxide. Then add 2g ferrous oxide, 2g 2-methylimidazole, 3g cobalt nitrate hexahydrate, 18g polyacrylonitrile and 250mL N,N-dimethylformamide to the reaction vessel and stir for 30min at 20℃ and 500r / min. Transfer to a syringe and electrospin under experimental conditions of 20kV applied voltage, 3mm / h feed speed and 18cm receiving distance to obtain ZIF-8 / ferrous oxide composite fiber. Spray the ZIF-8 / ferrous oxide composite fiber onto a water-resistant and antifouling layer to form a 200nm thick microwave radiation protection layer, resulting in a spectacle lens with microwave radiation protection and blue light protection.

[0039] Example 2: A method for preparing a spectacle lens that protects against microwave radiation and blue light, comprising the following steps: S1: Add 32.5g of cetyltrimethylammonium bromide and 2.5L of ammonia water to a reaction vessel, stir for 35min at 22.5℃ and 550r / min, then add 175mL of tetraethyl orthosilicate, continue the reaction for 6.5h, centrifuge at 8500r / min for 6.5min, transfer the filter cake to 1.75L of isopropanol and 15g of ammonium nitrate, react at 85℃ for 25h, and freeze-dry under vacuum at -20℃ for 13h to obtain silica particles.

[0040] S2: Add 21g hexadecyltrimethylammonium bromide, 16g urea, 9g silica particles and 475mL deionized water to a reaction vessel, stir for 35min at 22.5℃ and 550r / min, then add 18mL isopropanol and 6mL tetraethyl orthosilicate, continue stirring for 35min, heat to 75℃, continue the reaction for 17h, filter, wash the filter cake 3 times with deionized water, vacuum dry at 70℃ for 1.5h, transfer to a muffle furnace, heat to 575℃ and calcine for 7h to obtain burr-like silica powder.

[0041] S3: 17.5g of burr-like silica powder, 22.5g of 5-hydroxyisophthalic acid and 850mL of deionized water were added to a reaction vessel. 2.5g of sodium hexadecyl sulfate was dissolved in 130mL of 55wt% ethanol solution and then added to the reaction vessel. The mixture was stirred at 105℃ and 450r / min for 1.5h. Then 10.5g of chromium nitrate was added, and the reaction was continued to be stirred for 25h. The mixture was filtered, and the filter cake was washed three times with deionized water and three times with anhydrous ethanol. The cake was then dried under vacuum at 70℃ for 1.5h to obtain chromium MOF / burr-like silica powder.

[0042] S4: Place the eyeglass substrate in deionized water for ultrasonic cleaning for 50 minutes, vacuum dry at 70°C for 1.5 hours, and then spray chromium MOF / burred silica powder onto the eyeglass substrate to obtain an eyeglass lens with a blue light blocking layer with a thickness of 550nm.

[0043] S5: Add 17.5g methyl methacrylate, 18g polymethyl methacrylate-b-4-vinylpyridine, 16.5g methacrylic acid, 6g vinyl POSS and 275mL deionized water to a reaction vessel and stir for 35min at 22.5℃ and 550r / min. Then add 3.5g sodium dodecyl sulfate and 1.5g ammonium persulfate and heat to 85℃ to obtain a mixed solution. Immerse the eyeglass lens containing the blue light blocking layer in the mixed solution and continue the reaction for 1.5h. Remove the eyeglass lens and vacuum dry it at 70℃ for 1.5h to form a water-resistant and stain-resistant layer with a thickness of 150nm.

[0044] S6: 3.5g sodium thiosulfate, 11g ferrous chloride, 5g sodium hydroxide and 130mL deionized water were added to a reaction vessel and stirred at 210℃ and 550r / min for 5.5h to obtain ferrous oxide. Then, 3g ferrous oxide, 2.5g 2-methylimidazole, 4g cobalt nitrate hexahydrate, 21.5g polyacrylonitrile and 275mL N,N-dimethylformamide were added to the reaction vessel and stirred at 22.5℃ and 550r / min for 35min. The mixture was then transferred to a syringe and electrospun under experimental conditions of an applied voltage of 21kV, a propulsion speed of 3.5mm / h and a receiving distance of 19cm to obtain ZIF-8 / ferrous oxide composite fiber. The ZIF-8 / ferrous oxide composite fiber was sprayed onto a water-resistant and antifouling layer to form a 250nm thick microwave radiation protection layer, resulting in a spectacle lens with microwave radiation protection and blue light protection.

[0045] Example 3: A method for preparing a spectacle lens that protects against microwave radiation and blue light, comprising the following steps: S1: Add 35g of hexadecyltrimethylammonium bromide and 3L of ammonia water to a reaction vessel, stir for 40min at 25℃ and 600r / min, then add 180mL of tetraethyl orthosilicate, continue the reaction for 7h, centrifuge at 9000r / min for 8min, transfer the filter cake to 2L of isopropanol and 16g of ammonium nitrate, react at 90℃ for 26h, and freeze-dry under vacuum at -20℃ for 14h to obtain silica particles.

[0046] S2: Add 22g hexadecyltrimethylammonium bromide, 20g urea, 10g silica granules and 500mL deionized water to a reaction vessel, stir for 40min at 25℃ and 600r / min, then add 20mL isopropanol and 8mL tetraethyl orthosilicate, continue stirring for 40min, heat to 80℃, continue the reaction for 18h, filter, wash the filter cake 4 times with deionized water, vacuum dry at 80℃ for 2h, transfer to a muffle furnace, heat to 600℃ and calcine for 8h to obtain burr-like silica powder.

[0047] S3: Add 20g of burr-like silica powder, 25g of 5-hydroxyisophthalic acid and 900mL of deionized water to a reaction vessel. Dissolve 3g of sodium hexadecyl sulfate in 140mL of 60wt% ethanol solution and add it to the reaction vessel. Stir at 110℃ and 500r / min for 2h. Then add 11g of chromium nitrate and continue stirring for 26h. Filter the mixture and wash the filter cake four times with deionized water and anhydrous ethanol, respectively. Dry it under vacuum at 80℃ for 2h to obtain chromium MOF / burr-like silica powder.

[0048] S4: Place the eyeglass substrate in deionized water for ultrasonic cleaning for 60 minutes, vacuum dry at 80°C for 2 hours, and then spray chromium MOF / burred silica powder onto the eyeglass substrate to obtain an eyeglass lens with a 600nm thick anti-blue light layer.

[0049] S5: Add 20g of methyl methacrylate, 19g of polymethyl methacrylate-b-4-vinylpyridine, 17g of methacrylic acid, 7g of vinyl POSS and 300mL of deionized water to a reaction vessel and stir for 40min at 25℃ and 600r / min. Then add 4g of sodium dodecyl sulfate and 2g of ammonium persulfate and heat to 90℃ to obtain a mixed solution. Immerse the eyeglass lens containing the blue light blocking layer in the mixed solution and continue the reaction for 2h. Remove the eyeglass lens and vacuum dry it at 80℃ for 2h to form a water-resistant and stain-resistant layer with a thickness of 200nm.

[0050] S6: Add 4g sodium thiosulfate, 12g ferrous chloride, 6g sodium hydroxide and 140mL deionized water to a reaction vessel and stir for 6h at 220℃ and 600r / min to obtain ferrous oxide. Then add 4g ferrous oxide, 3g 2-methylimidazole, 5g cobalt nitrate hexahydrate, 25g polyacrylonitrile and 300mL N,N-dimethylformamide to the reaction vessel and stir for 40min at 25℃ and 600r / min. Transfer to a syringe and electrospin under experimental conditions of 22kV applied voltage, 4mm / h feed speed and 20cm receiving distance to obtain ZIF-8 / iron oxide composite fiber. Spray the ZIF-8 / iron oxide composite fiber onto a water-resistant and antifouling layer to form a 300nm thick microwave radiation protection layer, resulting in a spectacle lens with microwave radiation protection and blue light protection.

[0051] In the examples and comparative examples: Polymethyl methacrylate-b-4-vinylpyridine was purchased from Xi'an Qiyue Biotechnology Co., Ltd., product number: Q-0004638.

[0052] The vinyl POSS was purchased from Shanghai McLean Biochemical Technology Co., Ltd., CAS No.: 69655-76-1.

[0053] Comparative Example 1: Based on Example 3, the burr-like silica powder in step S3 was replaced with silica particles prepared in step S1.

[0054] Comparative Example 2: Based on Example 3, the polymethyl methacrylate-b-4-vinylpyridine in step S5 was omitted.

[0055] Comparative Example 3: Based on Example 3, cobalt nitrate hexahydrate in step S6 was omitted.

[0056] The performance of the eyeglass lenses prepared in Examples 1-3 and Comparative Examples 1-3, which have both microwave radiation protection and blue light protection, was tested, and the results are shown in Table 1: 1. Ultraviolet light transmittance was tested in accordance with GB 10810.3-2006 "Spectacle Lenses and Related Spectacle Products Part 3: Transmittance Specifications and Measurement Methods".

[0057] 2. Test the blue light transmittance according to the standard of GB / T38120—2019 "Technical Requirements for the Application of Blue Light Protective Film in Light Health and Light Safety".

[0058] 3. According to the standard test of GB / T 23466-2009 "Glass Plates for Radiation Protection", the shielding rate of 100keV gamma rays = (1 - gamma ray dose rate after passing through the lens / incident gamma ray dose rate) × 100%.

[0059]

[0060] As shown in Table 1, in Comparative Example 1, replacing the burr-like silica powder in step S3 with silica particles prepared in step S1, the burr protrusions of the burr-like silica can increase the specific surface area, allowing the chromium MOF to be uniformly loaded and forming a dense absorption and scattering network. In contrast, ordinary silica particles have a smooth surface, resulting in a reduced chromium MOF loading and uneven distribution, which manifests as an increase in the transmittance of harmful blue light at 400nm and an increase in the transmittance of ultraviolet light. The scattering of the burr-like structure is wavelength selective, while the scattering of ordinary silica particles is non-selective. The burr-like structure can form a mechanical interlock with the intermediate water-resistant and anti-fouling layer, while ordinary silica particles have no protrusion structure and are only bound by intermolecular forces. After long-term wear and wiping, the anti-blue light layer is prone to peeling off from the water-resistant and anti-fouling layer.

[0061] In Comparative Example 2, the polymethyl methacrylate-b-4-vinylpyridine in step S5 was removed. Polymethyl methacrylate-b-4-vinylpyridine is a block copolymer. The polymethyl methacrylate segment has good compatibility with the chromium MOF / silica of the blue light protection layer, and the 4-vinylpyridine segment has a coordination effect with the ZIF-8 / iron oxide of the microwave radiation protection layer, which plays a bridging role. After removal, the water-resistant and anti-fouling layer is only a common acrylate polymer network, and the interfacial force with the upper and lower layers is only van der Waals force. The bonding strength is greatly reduced and the coating is easy to peel off. The pyridine group can form a coordination bond with the cobalt ions of ZIF-8 to achieve pyridine doping, which enhances the dipole polarization and interfacial polarization of ZIF-8. Without pyridine doping, the dielectric loss tangent of ZIF-8 cannot be improved, and the microwave energy consumption efficiency is reduced. The amphiphilic structure of polymethyl methacrylate-b-4-vinylpyridine can optimize the surface energy of the water-resistant and antifouling layer and improve the hydrophobic effect. Without pyridine doping, the hydrophilic-hydrophobic balance of the polymer network is disrupted, and the problems of rainwater adhesion and oil residue are obvious, affecting visibility in rainy weather.

[0062] Comparative Example 3: Based on Example 3, cobalt nitrate hexahydrate in step S6 was omitted. The formation of ZIF-8 depends on the coordination reaction between 2-methylimidazole and cobalt ions. After omitting cobalt nitrate hexahydrate, only iron oxide / polyacrylonitrile composite fibers can be obtained. The porous scattering and polarization loss effect of ZIF-8 is lost. Relying solely on iron oxide, dual microwave protection of absorption and scattering cannot be achieved, and the microwave penetration rate is significantly increased. The porous framework of ZIF-8 can fix iron oxide particles and prevent them from agglomerating. Without ZIF-8, iron oxide particles are prone to agglomeration during electrospinning, resulting in uneven distribution of active sites in the microwave radiation protection layer. Without cobalt ions, there is no ZIF-8. The pyridine groups of the water-resistant and antifouling layer lack coordination targets and only rely on physical adsorption to bind with the microwave radiation protection layer, resulting in decreased interfacial adhesion. Long-term use can easily lead to the peeling off of the microwave radiation protection layer.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for preparing a spectacle lens that protects against microwave radiation and blue light, characterized in that, Includes the following steps: Step 1: Using hexadecyltrimethylammonium bromide to form a micelle template in ammonia water, tetraethyl orthosilicate is used as the silicon source. After hydrolysis and condensation reaction, isopropanol and ammonium nitrate are used to remove the template to obtain silica particles. Using silica particles as the core, tetraethyl orthosilicate is hydrolyzed and condensed with urea to form a burr-like silicon layer to obtain burr-like silica powder. Step 2: Using 5-hydroxyisophthalic acid as a ligand, chromium nitrate is hydrothermally coordinated to grow a chromium-based metal-organic framework in situ on the surface of burred silica to obtain chromium MOF / burred silica powder; the chromium MOF / burred silica powder is then sprayed onto an eyeglass lens to obtain an eyeglass lens containing a blue light blocking layer. Step 3: A polymer network is formed by initiating the formation of double bonds in the structures of polymethyl methacrylate-b-4-vinylpyridine, vinyl POSS, methyl methacrylate, and methacrylic acid. Then, the eyeglass lens containing the blue light blocking layer is immersed in the polymer network to form a water-resistant and stain-resistant layer. Step 4: Ferrous chloride reacts with sodium thiosulfate to generate ferrous oxide, which then coordinates with 2-methylimidazole and cobalt nitrate hexahydrate to form ZIF-8. After electrospinning with polyacrylonitrile, ZIF-8 / ferrous oxide composite fiber is obtained. The ZIF-8 / ferrous oxide composite fiber is then sprayed onto a water-resistant and stain-resistant layer to form a microwave radiation protection layer, resulting in eyeglass lenses that protect against microwave radiation and blue light.

2. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific preparation steps for the silica particles are as follows: Hexadecyltrimethylammonium bromide and ammonia were added to a reaction vessel and stirred for 30-40 min at 20-25℃ and 500-600 r / min. Then tetraethyl orthosilicate was added and the reaction was continued for 6-7 h. After centrifugation at 8000-9000 r / min for 5-8 min, the filter cake was transferred to isopropanol and ammonium nitrate and reacted at 80-90℃ for 24-26 h. After vacuum freeze-drying at -20℃ for 12-14 h, silica particles were obtained. The ratio of hexadecyltrimethylammonium bromide, ammonia, tetraethyl orthosilicate, isopropanol, and ammonium nitrate is 30-35g: 2-3L: 170-180mL: 1.5-2L: 14-16g.

3. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific preparation steps for the burr-like silica powder are as follows: Hexadecyltrimethylammonium bromide, urea, silica particles, and deionized water were added to a reaction vessel and stirred for 30-40 minutes at 20-25°C and 500-600 r / min. Then, isopropanol and tetraethyl orthosilicate were added, and stirring was continued for another 30-40 minutes. The mixture was then heated to 70-80°C and reacted for 16-18 hours. The mixture was filtered, and the filter cake was washed 2-4 times with deionized water. It was then vacuum dried at 60-80°C for 1-2 hours and transferred to a muffle furnace. The mixture was then calcined at 550-600°C for 6-8 hours to obtain burr-like silica powder. The ratio of hexadecyltrimethylammonium bromide, urea, silica particles, deionized water, isopropanol and tetraethyl orthosilicate is 20-22g: 12-20g: 8-10g: 450-500mL: 16-20mL: 4-8mL.

4. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific preparation steps for the chromium MOF / burred silica powder are as follows: Add spiky silica powder, 5-hydroxyisophthalic acid and deionized water to a reaction vessel. Dissolve sodium hexadecyl sulfate in 50-60 wt% ethanol solution and add it to the reaction vessel. Stir at 100-110℃ and 400-500 r / min for 1-2 h. Then add chromium nitrate and continue stirring for 24-26 h. Filter the mixture and wash the filter cake 2-4 times with deionized water and anhydrous ethanol, respectively. Dry it under vacuum at 60-80℃ for 1-2 h to obtain chromium MOF / spiky silica powder. The ratio of the amount of the burr-like silica powder, 5-hydroxyisophthalic acid, deionized water, sodium hexadecyl sulfate, ethanol solution and chromium nitrate is 15-20g: 20-25g: 800-900mL: 2-3g: 120-140mL: 10-11g.

5. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific steps for preparing the blue light blocking layer on the eyeglass lens are as follows: The lens substrate is ultrasonically cleaned in deionized water for 40-60 minutes and vacuum dried at 60-80℃ for 1-2 hours. Then, chromium MOF / burred silica powder is sprayed onto the lens substrate to obtain a lens containing a blue light blocking layer with a thickness of 500-600nm.

6. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific preparation steps for the water-resistant and antifouling layer are as follows: Methyl methacrylate, polymethyl methacrylate-b-4-vinylpyridine, methacrylic acid, vinyl POSS, and deionized water are added to a reaction vessel and stirred for 30-40 minutes at 20-25°C and 500-600 rpm. Then, sodium dodecyl sulfate and ammonium persulfate are added, and the mixture is heated to 80-90°C to obtain a mixed solution. The spectacle lens containing the blue light blocking layer is then immersed in the mixed solution, and the reaction continues for 1-2 hours. The spectacle lens is then removed and vacuum dried at 60-80°C for 1-2 hours to form a water-resistant and stain-resistant layer with a thickness of 100-200 nm.

7. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 6, characterized in that, The ratio of methyl methacrylate, polymethyl methacrylate-b-4-vinylpyridine, methacrylic acid, vinyl POSS, deionized water, sodium dodecyl sulfate, and ammonium persulfate is 15-20g: 17-19g: 16-17g: 5-7g: 250-300mL: 3-4g: 1-2g.

8. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific preparation steps of the ZIF-8 / iron oxide composite fiber are as follows: Sodium thiosulfate, ferrous chloride, sodium hydroxide, and deionized water were added to a reaction vessel and stirred for 5-6 hours at 200-220℃ and 500-600 r / min to obtain ferrous oxide. Then, ferrous oxide, 2-methylimidazole, cobalt nitrate hexahydrate, polyacrylonitrile, and N,N-dimethylformamide were added to the reaction vessel and stirred for 30-40 minutes at 20-25℃ and 500-600 r / min. The mixture was then transferred to a syringe and electrospun under experimental conditions of an applied voltage of 20-22 kV, a feed rate of 3-4 mm / h, and a receiving distance of 18-20 cm to obtain ZIF-8 / ferrous oxide composite fiber. The ratio of sodium thiosulfate, ferrous chloride, sodium hydroxide, and deionized water is 3-4g:10-12g:4-6g:120-140mL; the ratio of ferrous oxide, 2-methylimidazole, cobalt nitrate hexahydrate, polyacrylonitrile, and N,N-dimethylformamide is 2-4g:2-3g:3-5g:18-25g:250-300mL.

9. The method for preparing a spectacle lens with microwave radiation protection and blue light protection according to claim 1, characterized in that, The specific manufacturing steps for the eyeglass lens with microwave radiation protection and blue light protection are as follows: ZIF-8 / iron oxide composite fiber is sprayed onto a water-resistant and stain-resistant layer to form a microwave radiation protection layer with a thickness of 200-300nm, resulting in eyeglass lenses that protect against microwave radiation and blue light.

10. A pair of eyeglass lenses that protect against microwave radiation and blue light, characterized in that, It is prepared by the preparation method described in any one of claims 1-9.

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