A method for preparing a color contrast enhancement coating and a coated lens

Abstract

This invention discloses a method for preparing a color contrast enhancement coating and a coated lens, belonging to the field of optical functional coating technology. Addressing the problems of existing high-contrast dyes readily reacting and decomposing with cast lenses, limited application range, high solvent toxicity, high curing temperature, and poor coating durability, this invention employs microencapsulation of dyes with narrow absorption peaks of 480nm, 585nm, and 680nm. The functional coating is obtained through environmentally friendly compound solvent dissolution, dual-curing coating liquid preparation, lens plasma pretreatment, gradient spin coating, and UV-low temperature thermal dual curing. This invention is compatible with all types of optical lenses, including CR39, MR series, PC, and nylon, accurately shielding target wavelength light. The color contrast effect is consistent with traditional injection-molded high-contrast lenses. It possesses advantages such as environmental friendliness at low temperatures, strong coating adhesion, excellent scratch resistance, stable and controllable process, and suitability for industrial mass production. It can be widely used in outdoor vision enhancement, driving protection, and other optical lens fields.

Description

Technical Field

[0001] This invention belongs to the field of optical functional coating technology, specifically, it relates to a method for preparing a color contrast enhancement coating and a coated lens. Background Technology

[0002] High-contrast optical lenses selectively block specific wavelengths of visible light, optimizing the photosensitive signals of the three types of cone cells in the human eye, thereby improving color resolution and object outline recognition. They are widely used in outdoor vision enhancement, driving protection, and visual assistance applications. The core principle of existing high-contrast lenses is: blocking 480nm blue-green light to reduce signal interference between S-cone cells and M-cone cells, strengthening the blue-yellow visual contrast; blocking 585nm yellow-orange light to improve the contrast of the red-green channel; and blocking 680nm deep red light to alleviate the blurring of strong red light, ultimately achieving optimized color vision under complex lighting conditions.

[0003] Existing high-contrast lenses are mainly manufactured using injection molding, which is only suitable for PC and nylon lenses. However, cast lenses such as CR39, MR-7, MR-8, and MR-174 require the use of peroxide initiators or contain a large amount of thiol components during the curing process. High-contrast dyes are prone to react and decompose with these components, leading to functional failure and making it impossible to achieve high-contrast functional modification for all types of lenses.

[0004] To address the aforementioned issues, existing technologies attempt to replace injection molding with surface coating processes, but these still suffer from several drawbacks: 1) The dyes are in a free state, making them prone to reacting with the coating curing agent and lens substrate, resulting in poor stability; 2) The use of pure NMP solvent leads to high toxicity and poor environmental friendliness; 3) The use of 120℃ high-temperature thermal curing can easily damage the lens substrate, and the coating adhesion and scratch resistance are poor; 4) The coating process is limited, resulting in poor coating uniformity and making it difficult to adapt to industrial mass production.

[0005] Therefore, developing a method for preparing a color contrast enhancement coating that does not decompose dyes, is compatible with all lenses, is environmentally friendly and operates at low temperatures, and has excellent coating performance has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a method for preparing a color contrast enhancement coating and a coated lens. By constructing a coating with a specific wavelength shielding function on the lens surface, the complex chemical reaction environment of the cast lens body is bypassed, and a compatible coverage of lens substrates of all materials is achieved.

[0007] To achieve the above-mentioned technical objectives, this invention discloses a method for preparing a color contrast enhancement coating, which includes the following steps: S1 Preparation of coated dye solution: Microcapsules containing dyes with narrow absorption peaks of 480 nm, 585 nm, and 680 nm were added to an environmentally friendly compound solvent and heated and stirred until completely dissolved or highly dispersed to obtain a dye solution.

[0008] S2 Preparation of Dual-Curing Coating Liquid: Aliphatic polyurethane acrylate, IPDI (isophorone diisocyanate) curing agent, UV photoinitiator, and environmentally friendly compound solvent are mixed and stirred, and then the dye liquid obtained from S1 is added. The mixture is stirred evenly to obtain the coating liquid.

[0009] S3 Lens Pretreatment: Plasma cleaning is performed on the surface of the lens substrate to increase surface energy and improve coating adhesion.

[0010] S4 gradient spin coating: The coating liquid obtained from S2 was applied to the surface of the pretreated lens substrate using a gradient spin coating process.

[0011] S5 Dual-Cure Molding: The coating with enhanced color contrast is first pre-cured by UV light irradiation and then thermally cured by low-temperature baking.

[0012] Furthermore, the core material of the microcapsule-encapsulated 480nm narrow absorption peak dye is an azo-type blue-green light-absorbing dye with an absorption peak of 480±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1 and a particle size of 200~500nm; the core material of the microcapsule-encapsulated 585nm narrow absorption peak dye is a metal-complexed yellow-orange light-absorbing dye with an absorption peak of 585±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1.25 and a particle size of 200~500nm; the core material of the microcapsule-encapsulated 680nm narrow absorption peak dye is an anthraquinone-type deep red light-absorbing dye with an absorption peak of 680±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1.5 and a particle size of 200~500nm.

[0013] The polyurethane urea microcapsule encapsulation technology used in this solution serves two purposes. First, the microcapsule wall material protects the sensitive dye molecules, preventing them from decomposing or migrating in the IPDI curing agent and free radical polymerization environment. Second, the specific core-to-wall ratio and particle size design ensure that the dye distribution in the coating thickness direction is controllable, and that the microcapsules maintain their morphological integrity and do not rupture during the UV-thermal dual curing process.

[0014] Furthermore, the environmentally friendly compound solvent in S1 is a mixture of N,N-dimethylacetamide (DMAC) and propylene glycol methyl ether acetate (PGMEA) in a volume ratio of 7:3. This compound system balances the microswelling of the microcapsule wall material and the high solubility of the resin base material, and has a moderate boiling point, making it suitable for spin coating.

[0015] Furthermore, the weight ratio of each raw material in S1 is as follows: 0.08~0.15 parts of 480nm dye encapsulated in microcapsules, 0.08~0.15 parts of 585nm dye encapsulated in microcapsules, 0.10~0.25 parts of 680nm dye encapsulated in microcapsules, and 50 parts of environmentally friendly compound solvent; the heating temperature is 80℃ and the stirring time is 15min.

[0016] Furthermore, the raw material weight ratio of the dual-curing coating liquid in S2 is as follows: 200-400 parts of aliphatic polyurethane acrylate, 50-150 parts of IPDI curing agent, 5-10 parts of UV photoinitiator, 150 parts of environmentally friendly compound solvent, and 0.5-1 parts of functional additives.

[0017] Furthermore, the functional additive is nano-SiO2, which is used to adjust the surface hardness and scratch resistance of the coating; the UV photoinitiator is photoinitiator 1173 (2-hydroxy-2-methyl-1-phenyl-1-propanone).

[0018] Furthermore, the plasma cleaning time in S3 is 30 seconds to thoroughly remove organic residues from the lens surface and introduce polar groups.

[0019] Furthermore, the gradient spin coating process in S4 consists of: low-speed spreading at 300 rpm for 5 seconds, followed by high-speed setting at 2000 rpm for 10 seconds, with the coating thickness controlled at 1~2 μm. This thickness provides sufficient spectral absorption without causing interference fringes or cracking due to excessive coating thickness.

[0020] Furthermore, in S5, the UV curing wavelength is 395nm and the irradiation time is 1min; the low-temperature baking temperature is 80℃ and the baking time is 15min. The dual curing mechanism ensures that the coating has both rapid initial setting capability (UV curing) and complete cross-linking of IPDI and hydroxyl groups in polyurethane at low temperature, avoiding the risk of deformation to the lens substrate (especially low Tg CR39 or PC) caused by high-temperature baking.

[0021] Furthermore, this invention also discloses a high-contrast coated lens, comprising a lens substrate and a color contrast-enhancing coating applied to the surface of the substrate. The coating is prepared by any of the aforementioned methods.

[0022] Furthermore, the coating precisely blocks light at wavelengths of 480nm, 585nm, and 680nm. Spectral transmittance testing shows that its color contrast effect is consistent with high-contrast PC / nylon injection-molded lenses, but it achieves the same function on cast substrates such as CR39 and MR-8.

[0023] Compared with the prior art, the present invention can achieve the following technical effects: By constructing an independent coating system on the lens surface, the decomposition side reaction of peroxide initiators or thiols on narrow absorption peak dyes during the bulk polymerization process of cast lenses is bypassed, achieving full coverage of color contrast function for resin lenses such as CR39 and MR series as well as PC and nylon lenses. By using polyurethane urea microcapsules with specific core-to-wall ratios and particle sizes to pre-coat dyes in three wavelength bands, not only is the contact between IPDI curing agent and active dye groups effectively blocked during the dual-curing molding process, preventing chemical deactivation during the curing stage, but also significantly inhibiting dye migration and precipitation in the finished lens during long-term use, ensuring the durability and stability of the coating's optical performance.

[0024] By compounding three narrow absorption peak microcapsule dyes of 480nm, 585nm and 680nm, the spectral "groove" curve optimized for human visual contrast can be accurately reproduced within a coating thickness of only 1~2μm. Its final spectral shielding effect is highly consistent with that of commercially available high-end injection-molded high-contrast lenses. At the same time, it has the excellent flexibility and interlayer adhesion of aliphatic polyurethane acrylate system, which improves color resolution while ensuring the impact resistance and weather resistance of the lens.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart illustrating the preparation method of the color contrast enhancement coating according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the layered structure of the color contrast enhancement coating lens according to an embodiment of the present invention; Figure 3 This is a spectral analysis report of the color contrast enhancement coating lens according to an embodiment of the present invention.

[0027] Figure label: 1 - High-contrast functional coating; 2 - Lens substrate. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. The raw materials used in the embodiments of the present invention are all commercially available optical-grade pure raw materials, and the equipment used is all conventional optical coating preparation equipment in the art, including constant temperature heating stirrers, plasma cleaners, spin coaters, UV curing machines, constant temperature ovens, etc. Operation methods not specified under specific conditions are all performed according to conventional optical coating processing techniques.

[0029] Example 1: A basic color contrast enhancement coating was prepared and applied to the surface of an MR-8 lens substrate to obtain a basic high-contrast coated lens. Please refer to [link / reference needed]. Figure 1 The specific operating steps are as follows: S1 Preparation of the coated dye solution: Accurately weigh the raw materials according to the weight parts, take 0.1 parts of the 480nm narrow absorption peak dye, 0.1 parts of the 585nm narrow absorption peak dye, and 0.15 parts of the 680nm narrow absorption peak dye encapsulated in microcapsules. Add the above three coated dyes sequentially to 50 parts of environmentally friendly compound solvent. The environmentally friendly compound solvent is prepared by mixing N,N-dimethylacetamide and propylene glycol methyl ether acetate in a volume ratio of 7:3. Place the mixture in a constant temperature heating stirrer, set the heating temperature to 80℃, the stirring speed to 300r / min, and continue heating and stirring for 15min until the three coated dyes are completely dissolved, to obtain a uniform, stable, precipitate-free, and non-precipitated blue-green coated dye solution, and seal it for later use.

[0030] S2 Preparation of Dual-Curing Coating Solution: Accurately weigh the raw materials according to the following weight proportions: 300 parts aliphatic polyurethane acrylate, 100 parts IPDI curing agent, 8 parts UV photoinitiator 1173, 150 parts environmentally friendly compound solvent, and 0.8 parts nano-SiO2 functional additive. Add the above raw materials sequentially to a clean glass reaction beaker. Turn on the magnetic stirrer at room temperature and pressure, set the stirring speed to 500 r / min, and continue stirring for 30 min until the system is uniformly mixed, free of particles, and without stratification. Then, slowly add the coating dye solution prepared in step S1 to the above mixture, keeping the stirring speed constant, and continue stirring for 15 min to fully integrate the dye solution with the coating base solution, obtaining a uniform and stable color contrast-enhancing dual-curing coating solution. Prepare and use immediately.

[0031] S3 Lens Pretreatment: Select an optical-grade MR-8 lens substrate as the coating substrate. First, immerse the lens substrate in anhydrous ethanol for ultrasonic cleaning for 5 minutes to remove surface oil, dust and impurities. After removal, blow dry the surface with nitrogen to remove residual ethanol. Then, place the dried lens substrate in a plasma cleaner, set the plasma cleaning power to 100W and the cleaning time to 30s. The plasma activates the lens surface, increases the surface tension, and enhances the adhesion between the subsequent coating and the lens substrate.

[0032] S4 Gradient Spin Coating: The pretreated MR-8 lens substrate is fixed on the suction cup of the spin coater, and the vacuum adsorption is turned on to fix the lens. The gradient spin coating process is used for coating. First, the spin coating speed is set to 300 rpm, and low-speed spin coating is performed for 5 seconds to make the coating liquid spread evenly on the lens surface. Then, the speed is quickly increased to 2000 rpm, and high-speed spin coating is performed for 10 seconds to remove excess coating liquid, so that the coating is uniformly formed and the coating thickness is controlled to be stable at 1.5 μm. After coating is completed, the lens is removed and left to stand for 30 seconds to eliminate the surface stress of the coating.

[0033] S5 Dual-Cure Molding: The spin-coated lens is first transferred to a UV curing machine, with the UV wavelength set to 395nm and the light intensity to 800mW / cm². 2 The lens is then continuously irradiated for 1 minute to complete the initial UV curing of the coating; the UV-cured lens is then placed in a constant temperature oven, set to 80℃, and baked for 15 minutes to allow the coating to fully thermo-cur and cross-link; after curing, it is allowed to cool naturally to room temperature to obtain the basic high-contrast coated lens. Figure 2 As shown, the lens includes a high-contrast functional coating 1 and a lens substrate 2.

[0034] Based on Example 1, two additional implementation examples are provided, specifically Example 1.1: S1 Preparation of the coated dye solution: Accurately weigh 0.08 parts by weight of the dye with a narrow absorption peak of 480nm encapsulated in microcapsules, 0.08 parts by weight of the dye with a narrow absorption peak of 585nm encapsulated in microcapsules, and 0.10 parts by weight of the dye with a narrow absorption peak of 680nm encapsulated in microcapsules. Add the three coated dyes sequentially to 50 parts by weight of an environmentally friendly compound solvent (N,N-dimethylacetamide: propylene glycol methyl ether acetate = 7:3). Place the mixture in a constant temperature heating stirrer, set the heating temperature to 80℃, the stirring speed to 300r / min, and heat and stir for 15min until the dye is completely dissolved to obtain a uniform and stable blue-green coated dye solution. Seal and store for later use.

[0035] S2 Preparation of Dual-Curing Coating Solution: Accurately weigh 200 parts by weight of aliphatic polyurethane acrylate, 50 parts by weight of IPDI curing agent, 11735 parts by weight of UV photoinitiator, 150 parts by weight of environmentally friendly compound solvent, and 0.5 parts by weight of nano-SiO2 functional additive; add the above raw materials sequentially to a clean glass reaction beaker, and stir magnetically at room temperature and pressure at a speed of 500 r / min for 30 min until the system is uniform, free of particles and without stratification; then slowly add the dye solution prepared in S1, and continue stirring for 15 min while maintaining the same speed to obtain the dual-curing coating solution, which should be prepared and used immediately.

[0036] S3 Lens Pretreatment: Select an optical grade CR39 lens substrate, first immerse it in anhydrous ethanol for ultrasonic cleaning for 5 minutes to remove surface oil, dust and impurities, then remove it and blow dry the surface with high-purity nitrogen to remove residual ethanol; then place the lens in a plasma cleaner, set the power to 100W and the cleaning time to 30s, to activate the lens surface and improve coating adhesion.

[0037] S4 Gradient Spin Coating: Fix the pretreated lens onto the vacuum suction cup of the spin coater and turn on vacuum suction; use gradient spin coating, first spin coating at a low speed of 300 rpm for 5 seconds to spread the coating liquid evenly, then quickly increase to a high speed of 2000 rpm for 10 seconds to remove excess coating and control the coating thickness to 1 μm; after coating is completed, remove the lens and let it stand for 30 seconds to eliminate surface stress.

[0038] S5 Dual-Cure Molding: The lens is transferred to a UV curing machine, with a wavelength of 395nm and a light intensity of 800mW / cm², and is continuously irradiated for 1 minute to complete the initial curing; then it is transferred to a constant temperature oven, with a temperature of 80℃, and baked at a constant temperature for 15 minutes until the coating is completely cross-linked and cured; it is then naturally cooled to room temperature to obtain a high-contrast coated lens with a lower limit ratio.

[0039] Example 1.2: S1 Preparation of encapsulated dye solution: Accurately weigh 0.15 parts of microcapsule-encapsulated dye with a narrow absorption peak of 480nm, 0.15 parts of microcapsule-encapsulated dye with a narrow absorption peak of 585nm, and 0.25 parts of microcapsule-encapsulated dye with a narrow absorption peak of 680nm, and add them to 50 parts of environmentally friendly compound solvent (N,N-dimethylacetamide: propylene glycol methyl ether acetate = 7:3); heat and stir at 80℃ for 15 minutes until completely dissolved to obtain a blue-green dye solution, and seal for later use.

[0040] S2 Preparation of Dual-Curing Coating Solution: Accurately weigh 400 parts by weight of aliphatic polyurethane acrylate, 150 parts by weight of IPDI curing agent, 10 parts by weight of UV photoinitiator, 150 parts by weight of environmentally friendly compound solvent, and 1 part by weight of nano-SiO2 functional additive; stir at room temperature for 30 minutes until uniform, add S1 dye solution and continue stirring for 15 minutes to obtain dual-curing coating solution.

[0041] S3 Lens Pretreatment: Select an optical grade MR-174 lens substrate, ultrasonically clean with anhydrous ethanol for 5 minutes, and dry with nitrogen; treat with a plasma cleaner at 100W for 30 seconds to activate the surface.

[0042] S4 gradient spin coating: 300rpm low speed spreading for 5s, 2000rpm high speed setting for 10s, coating thickness controlled at 2μm.

[0043] S5 Dual Curing Molding: Irradiate with 395nm UV light for 1 minute, bake at 80℃ for 15 minutes, and cool to obtain a high-contrast coated lens with the upper limit ratio.

[0044] The two examples 1 and their two sub-examples 1.1 and 1.2 above can accurately shield wavelengths of 480nm, 585nm and 680nm, with consistent color contrast, are compatible with all types of lenses, have a curing temperature of 80℃, adhesion grade 0, scratch resistance ≥900 times, no dye decomposition or precipitation, and low toxicity and environmentally friendly solvents.

[0045] Example 2: Preparation of a high-scratch-resistant color contrast enhanced coating. Based on Example 1, the scratch resistance of the coating was improved. All other raw material ratios, operating steps, and process parameters were completely consistent with Example 1, except for the amount of functional additive added in step S2. The specific adjustments are as follows: S2 Preparation of Dual-Curing Coating Liquid: Accurately weigh the raw materials according to the following weight proportions: 300 parts of aliphatic polyurethane acrylate, 100 parts of IPDI curing agent, 8 parts of UV photoinitiator 1173, 150 parts of environmentally friendly compound solvent, and 1 part of nano-SiO2 functional additive. Add the above raw materials sequentially to a clean glass reaction beaker. Turn on the magnetic stirrer at room temperature and pressure, set the stirring speed to 500 r / min, and continue stirring for 30 min until the system is uniformly mixed, free of particles, and without stratification. Then, slowly add the coating dye liquid prepared in step S1 to the above mixture, keep the stirring speed constant, and continue stirring for 15 min to fully integrate the dye liquid with the coating base liquid, thereby obtaining a high scratch-resistant color contrast enhanced dual-curing coating liquid.

[0046] The raw materials, operations, and process parameters for the remaining steps S1, S3, S4, and S5 are exactly the same as in Example 1, and a high-scratch-resistant, high-contrast coated lens is finally obtained.

[0047] Example 3: Preparation of a low-cost color contrast enhancement coating. Based on Example 1, the resin and curing agent ratio was optimized to reduce raw material costs. All other raw material ratios, operating steps, and process parameters were completely consistent with Example 1. Only the amount of aliphatic polyurethane acrylate and IPDI curing agent added in step S2 was adjusted. The specific adjustments are as follows: S2 Preparation of Dual-Curing Coating Liquid: Accurately weigh the raw materials according to the following weight proportions: 250 parts aliphatic polyurethane acrylate, 80 parts IPDI curing agent, 8 parts UV photoinitiator 1173, 150 parts environmentally friendly compound solvent, and 0.8 parts nano-SiO2 functional additive. Add the above raw materials sequentially to a clean glass reaction beaker. Turn on the magnetic stirrer at room temperature and pressure, set the stirring speed to 500 r / min, and continue stirring for 30 min until the system is uniformly mixed, free of particles, and without stratification. Then, slowly add the coating dye liquid prepared in step S1 to the above mixture, keep the stirring speed constant, and continue stirring for 15 min to fully integrate the dye liquid with the coating base liquid, thereby obtaining a low-cost color contrast enhanced dual-curing coating liquid.

[0048] The raw materials, operations, and process parameters for the remaining steps S1, S3, S4, and S5 are exactly the same as those in Example 1, ultimately yielding a low-cost, high-contrast coated lens.

[0049] Comparative Example 1: This comparative example uses a conventional coating process from the prior art to prepare coated lenses, serving as a control sample for this invention. The specific operating steps are as follows: S1 Dye Solution Preparation: Weigh the raw materials by weight, and take 0.15g of free 480nm narrow absorption peak dye, 0.15g of free 585nm narrow absorption peak dye, and 0.2g of free 680nm narrow absorption peak dye. Add the three free dyes sequentially to 50g of NMP solvent. Place the mixture in a constant temperature heating stirrer, set the heating temperature to 100℃, the stirring speed to 300r / min, and continue heating and stirring for 20min until the dyes are completely dissolved to obtain the dye solution.

[0050] S2 Coating Solution Preparation: Weigh the raw materials by weight, take 400g of polycarbonate polyol, 200g of IPDI curing agent, and 200g of NMP solvent, and add the above raw materials to a glass reaction beaker in sequence. Stir at room temperature for 30 minutes until the mixture is uniform. Then add the dye solution obtained in step S1 and continue stirring for 20 minutes to obtain the conventional coating solution.

[0051] S3 Lens Pretreatment: Select the same MR-8 lens substrate as in Example 1, and use only anhydrous ethanol for ultrasonic cleaning for 5 minutes, followed by nitrogen drying. No plasma cleaning treatment is performed.

[0052] S4 Standard Spin Coating: The cleaned lens is fixed on the spin coater and directly spin coated at a single speed of 2000 rpm without gradient speed adjustment. The spin coating time is 15 seconds.

[0053] S5 thermosetting molding: The spin-coated lens is placed directly into a constant temperature oven, the temperature is set to 120℃, and it is baked at a constant temperature for 30 minutes to complete the curing. After natural cooling, the coated lens for comparison with the prior art is obtained.

[0054] The lenses prepared in Examples 1-3 and Comparative Example 1 were subjected to performance tests, and the results are shown in the table below:

[0055] Test results show that the coated lens prepared by this invention is compatible with all types of lenses while retaining the core color contrast function. The coating adhesion, scratch resistance, dye stability and environmental friendliness are significantly better than the existing technology.

[0056] Additionally, refer to Figure 3 Spectroscopic testing has verified that the color contrast enhancement coating lens prepared by this invention exhibits characteristic absorption peaks at three key wavelengths: 480nm, 585nm, and 680nm, which can achieve precise shielding of the target wavelength. Its spectral absorption curve completely overlaps with that of traditional PC and nylon injection-molded high-contrast lenses, and the color contrast enhancement effect is consistent.

[0057] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for preparing a color contrast enhancement coating, characterized in that, Includes the following steps: S1 Preparation of encapsulated dye solution: Microcapsules encapsulate dyes with a narrow absorption peak of 480nm, dyes with a narrow absorption peak of 585nm, and dyes with a narrow absorption peak of 680nm. Add them to an environmentally friendly compound solvent, heat and stir until completely dissolved to obtain a dye solution. S2 Preparation of dual-curing coating liquid: Mix and stir aliphatic polyurethane acrylate, IPDI curing agent, UV photoinitiator and environmentally friendly compound solvent, then add the dye liquid obtained in S1, and continue to stir evenly to obtain the coating liquid; S3 Lens Pretreatment: Plasma cleaning is performed on the lens substrate for 30 seconds; S4 Gradient spin coating: The coating liquid is applied to the pretreated lens substrate surface using a gradient spin coating process; S5 Dual-curing molding: First, it is cured by UV light, and then cured by low-temperature baking to obtain a coating with enhanced color contrast.

2. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The core material of the microcapsules encapsulating the 480nm narrow absorption peak dye is an azo-type blue-green light-absorbing dye with an absorption peak of 480±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1 and a particle size of 200~500nm; the core material of the microcapsules encapsulating the 585nm narrow absorption peak dye is a metal-complexed yellow-orange light-absorbing dye with an absorption peak of 585±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1.25 and a particle size of 200~500nm; the core material of the microcapsules encapsulating the 680nm narrow absorption peak dye is an anthraquinone-type deep red light-absorbing dye with an absorption peak of 680±5nm, and the wall material is polyurethane urea, with a core-to-wall ratio of 1:1.5 and a particle size of 200~500nm.

3. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The environmentally friendly compound solvent described in S1 is a mixture of N,N-dimethylacetamide and propylene glycol methyl ether acetate in a volume ratio of 7:

3.

4. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The weight ratio of each raw material in S1 is as follows: 0.08~0.15 parts of 480nm dye encapsulated in microcapsules, 0.08~0.15 parts of 585nm dye encapsulated in microcapsules, 0.10~0.25 parts of 680nm dye encapsulated in microcapsules, and 50 parts of environmentally friendly compounding solvent; the heating temperature is 80℃ and the stirring time is 15min.

5. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The raw material weight ratio of the dual-curing coating liquid described in S2 is as follows: 200-400 parts of aliphatic polyurethane acrylate, 50-150 parts of IPDI curing agent, 5-10 parts of UV photoinitiator, 150 parts of environmentally friendly compound solvent, and 0.5-1 parts of functional additives.

6. The method for preparing the color contrast enhancement coating according to claim 5, characterized in that, The functional additive is nano-SiO2, and the UV photoinitiator is photoinitiator 1173.

7. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The gradient spin coating process described in S4 is as follows: low-speed spreading at 300 rpm for 5 seconds, high-speed setting at 2000 rpm for 10 seconds, with the coating thickness controlled at 1~2 μm.

8. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The UV curing wavelength described in S5 is 395nm, and the irradiation time is 1min; the low-temperature baking temperature is 80℃, and the baking time is 15min.

9. The method for preparing the color contrast enhancement coating according to claim 1, characterized in that, The lens substrate is any one of CR39 lens, MR-7 lens, MR-8 lens, MR-174 lens, PC lens or nylon lens.

10. A high-contrast coated lens, characterized in that, It includes a lens substrate and a color contrast enhancement coating applied to the surface of the substrate, said coating being prepared by the method described in any one of claims 1 to 9.

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