A light-shielding color-changing resin lens and a method for manufacturing the same

Abstract

The application provides a kind of light-shielding color-changing resin lens and a preparation method thereof.The light-shielding color-changing resin lens comprises a lens substrate, a color-changing coating and a protective layer arranged in sequence.The color-changing coating contains a photochromic dye, and the excitation wavelength of the photochromic dye is 420-440 nm.By selecting a photochromic dye with an excitation wavelength of 420-440 nm as the color-changing substance of the color-changing coating, the obtained light-shielding color-changing resin lens can achieve a certain color-changing depth in a slightly dark shadow environment while ensuring that the color-changing depth is suitable when directly exposed to light, thereby creating a comfortable visual environment and making the wearer more comfortable when looking at things.The method also has the advantages of simple preparation, high efficiency and low cost.

Description

Technical Field

[0001] This invention belongs to the field of resin lens technology, specifically relating to a light-blocking photochromic resin lens and its preparation method. Background Technology

[0002] Photochromic resin lenses are eyeglasses that provide excellent darkness when directly exposed to sunlight, creating a comfortable visual environment. However, when in the shade, under a parasol, or inside a car, the photochromic effect is significantly reduced compared to direct sunlight exposure. Looking at bright objects in these shaded environments can be glaring, and prolonged use can easily cause visual fatigue and discomfort.

[0003] The color-changing effect in dark environments can usually be enhanced by increasing the concentration or thickness of the color-changing powder. However, this can also result in excessive darkness when directly exposed, causing difficulty in seeing objects.

[0004] CN113906334A discloses an optical article that exhibits a uniform first transmittance when directly exposed to photochemical radiation, such as sunlight; a gradient second percentage transmittance when exposed to photochemical radiation that has passed through a photochemical radiation barrier or attenuator (such as a vehicle windshield) inserted between the photochemical radiation source and the optical article; and a uniform third percentage transmittance when not exposed to photochemical radiation. For the optical article provided by this invention, the uniform first percentage transmittance is less than the uniform third percentage transmittance; however, the optical article provided by this invention has a relatively complex structure, is difficult to manufacture, uses special materials, and is also costly.

[0005] CN113621160A discloses a photochromic lens for vehicle interiors and its preparation method, relating to the field of lens technology. The lens includes a substrate and a photochromic liquid covering the substrate. The substrate comprises the following components and their respective weight percentages: 75-90 parts of 2-4 functional acrylate monomer, 10-25 parts of styrene, 0.1-0.2 parts of catalyst, 0.1-0.3 parts of light stabilizer, and 0.1-0.5 parts of chain transfer agent. The photochromic liquid comprises the following components and their respective weight percentages: 15-30 parts of alkyd resin, 4-10 parts of amino resin, 5-10 parts of isocyanate, 40-70 parts of solvent, and 3-7 parts of vehicle interior photochromic material. The photochromic lens provided by this invention can block most of the ultraviolet rays that the vehicle film fails to block, reducing the amount of ultraviolet rays penetrating into the eye and providing a more comfortable environment for the eyes. However, the application scope of this invention is limited, only targeting the protection against residual ultraviolet rays inside the vehicle, and its effectiveness is limited.

[0006] Therefore, it is desirable to develop a light-blocking photochromic resin lens that has a moderate color-changing effect under direct exposure and a strong color-changing ability in light-blocking scenarios. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a light-blocking photochromic resin lens and its preparation method. The light-blocking photochromic resin lens exhibits appropriate color change depth when directly exposed to sunlight and also enhances its color-changing ability in light-blocking scenarios, making it suitable for scenarios such as under trees, under parasols, near indoor windows, or inside vehicles.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a light-blocking photochromic resin lens, the light-blocking photochromic resin lens comprising a lens substrate, a photochromic coating and a protective layer disposed sequentially therefrom;

[0010] The color-changing coating contains a photochromic dye, and the excitation wavelength of the photochromic dye is 420-440nm, such as 422nm, 424nm, 426nm, 428nm, 430nm, 432nm, 434nm, 436nm, 438nm or 440nm.

[0011] The photochromic resin lens provided by this invention comprises a lens substrate, a photochromic coating, and a protective layer arranged sequentially. It employs a single photochromic coating, selecting a photochromic dye with an excitation wavelength between 420 and 440 nm as the photochromic substance in the coating. This enhances the photochromic ability of the resin lens under shaded conditions. Compared to direct sunlight, the amount of short-wavelength high-energy ultraviolet light is reduced under shaded conditions due to its poor penetration, while the amount of long-wavelength light increases. Using a photochromic dye that is more readily responded to by long wavelengths improves the photochromic ability under shaded conditions without affecting the photochromic ability under direct sunlight. This allows the resulting photochromic resin lens to achieve a certain depth of color change even in slightly dim, shaded environments (such as under trees, under parasols, near indoor windows, or inside a car), ensuring a comfortable wearing environment. Furthermore, the protective layer effectively prevents the protective layer from absorbing the color of the photochromic coating, ensuring excellent photochromic performance.

[0012] In addition to the above, the light-blocking photochromic resin lens provided by the present invention also has the advantages of simple preparation, high efficiency, and low cost.

[0013] Preferably, the material of the lens substrate includes any one or a combination of at least two of polyurethane, acrylic acid, polymethacrylate, or polycarbonate.

[0014] As a preferred technical solution of the present invention, selecting an anti-glare lens substrate softens the light and can further improve the comfort of viewing objects.

[0015] Preferably, the thickness of the color-changing coating is 10–20 μm, such as 12 μm, 14 μm, 16 μm, 18 μm, or 20 μm.

[0016] Preferably, the thickness of the protective layer is 15 to 25 μm, such as 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm or 24 μm.

[0017] Preferably, the raw material for preparing the color-changing coating is a color-changing coating liquid, which includes a combination of resin, photochromic dye, solvent and catalyst.

[0018] Preferably, the color-changing coating liquid comprises the following components by weight:

[0019]

[0020]

[0021] The resin may be 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, or 59 parts by weight, etc.

[0022] The photochromic dye can be in the form of 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 7.5 parts by weight, 8 parts by weight, 8.5 parts by weight, 9 parts by weight, or 9.5 parts by weight.

[0023] The solvent can be 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, or 29 parts by weight, etc.

[0024] The catalyst can be 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, or 4.5 parts by weight, etc.

[0025] Preferably, the raw materials for preparing the resin include polymeric polyols and isocyanate curing agents.

[0026] Preferably, the polymeric polyol includes polytetramethylene ether glycol and polycaprolactone triol.

[0027] Preferably, the isocyanate curing agent includes HMDI and IPDI.

[0028] Preferably, the photochromic dye includes spiropyran-based photochromic dyes.

[0029] Preferably, the solvent comprises dimethylformamide and / or N-methylpyrrolidone.

[0030] Preferably, the catalyst comprises dibutyltin dibutylsilicate.

[0031] Preferably, the color-changing coating liquid also includes additives.

[0032] Preferably, the content of the additive in the color-changing coating liquid is 1 to 10 parts by weight, such as 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight or 9 parts by weight.

[0033] Preferably, the color-changing coating liquid is prepared by the following method, the method comprising: mixing resin, photochromic dye, catalyst, polar solvent and optionally auxiliary agent to obtain the color-changing coating liquid.

[0034] Preferably, the raw material for preparing the protective layer is a protective liquid, and the protective liquid comprises the following components by weight:

[0035]

[0036]

[0037] The active monomer can be 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, 60 parts by weight, 62 parts by weight, 64 parts by weight, 66 parts by weight, or 68 parts by weight, etc.

[0038] The oligomer can be 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, or 24 parts by weight, etc.

[0039] The surfactant may be 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, or 0.9 parts by weight, etc.

[0040] The photoinitiator can be 0.25 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, or 0.45 parts by weight, etc.

[0041] Preferably, the active monomer comprises any one or a combination of at least two of the following: trimethylolpropane triacrylate, dimethylolpropane triacrylate, neopentyl glycol diacrylate, tetrahydrofuran acrylate, pentaerythritol triacrylate, or pentaerythritol tetraacrylate.

[0042] Preferably, the oligomer comprises any one or a combination of at least two of bisphenol A type epoxy resin, siloxane epoxy resin, or epoxy acrylate oligomer.

[0043] Preferably, the surfactant comprises N-methylaminopropyltrimethoxysilane and / or γ-glycidoxypropyltrimethoxysilane.

[0044] Preferably, the photoinitiator comprises diphenyl (2,4,6-trimethylbenzoyl)phosphine oxide and / or bisacryloylphosphine oxide.

[0045] Preferably, the protective coating also includes a solvent.

[0046] Preferably, the solvent content in the protective coating is 10 to 15 parts by weight, such as 10.5 parts by weight, 11 parts by weight, 11.5 parts by weight, 12 parts by weight, 12.5 parts by weight, 13 parts by weight, 13.5 parts by weight, 14 parts by weight, or 14.5 parts by weight.

[0047] Preferably, the solvent includes any one or a combination of at least two of xylene, N,N-dimethylformamide, or methylpyrrolidone.

[0048] Preferably, the protective liquid is prepared by a method comprising: mixing an active diluent monomer, an oligomer, a photoinitiator, a surfactant, and optionally a solvent to obtain the protective liquid.

[0049] In a second aspect, the present invention provides a method for preparing a light-blocking photochromic resin lens as described in the first aspect, the method comprising the following steps:

[0050] (1) Apply the photochromic liquid to the lens substrate and pre-cur it to obtain a lens coated with a photochromic coating.

[0051] (2) Apply the protective liquid to the photochromic coating of the lens coated with the photochromic coating obtained in step (1), and cure with UV to obtain the light-blocking photochromic resin lens.

[0052] Preferably, step (1) further includes a surface pretreatment step of the lens substrate before coating.

[0053] Preferably, the surface pretreatment method specifically includes: immersing the lens substrate in a sodium hydroxide solution, and then cleaning it sequentially in an alkaline cleaning agent and water to complete the surface pretreatment.

[0054] Preferably, the sodium hydroxide solution contains 10% to 30% sodium hydroxide by mass, such as 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, or 29%.

[0055] Preferably, the immersion is performed under ultrasonic conditions.

[0056] Preferably, the power of the ultrasound is 20 to 90 mV, such as 30 mV, 40 mV, 50 mV, 60 mV, 70 mV or 80 mV.

[0057] Preferably, the soaking time is 5 to 20 minutes, such as 7 minutes, 9 minutes, 11 minutes, 13 minutes, 15 minutes, 17 minutes, or 19 minutes.

[0058] Preferably, the pre-curing temperature in step (1) is 95 to 125°C, such as 100°C, 105°C, 110°C, 115°C or 120°C.

[0059] Preferably, the pre-curing time in step (1) is 30 to 120 minutes, such as 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes or 110 minutes.

[0060] Preferably, the UV curing time in step (2) is 2 to 5 seconds, such as 2.5 seconds, 3 seconds, 3.5 seconds, 4 seconds or 4.5 seconds.

[0061] Preferably, the UV curing power in step (2) is 400–600 mW / cm². 2 For example, 420mW / cm 2 440mW / cm 2 460mW / cm 2 480mW / cm 2 500mW / cm 2 520mW / cm 2 540mW / cm 2 560mW / cm 2 Or 580mW / cm 2 wait.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] (1) The photochromic resin lens provided by the present invention includes a lens substrate, a photochromic coating and a protective layer arranged in sequence. A single photochromic coating is used, and a photochromic dye with an excitation wavelength between 420 and 440 nm is selected as the photochromic substance of the photochromic coating. This allows the photochromic resin lens to achieve a certain depth of color change in a slightly darker shaded environment (under a tree, under a parasol, by an indoor window or inside a car, etc.) while ensuring that the color change depth is appropriate under direct exposure. This creates a comfortable wearing environment and makes the wearer more comfortable. It also has the advantages of simple preparation, high efficiency and low cost.

[0064] (2) Specifically, the light transmittance of the photochromic resin lens provided by the present invention is 90.4-92.2% in the faded state, which has a good light transmittance effect; the light transmittance under direct sunlight is only 8.3-13.5%, and the light transmittance under light blocking is only 24.5-30.5%, which shows that it can also achieve a certain color change depth in the shaded environment and has a certain light blocking effect. Detailed Implementation

[0065] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0066] Detailed information on some of the raw materials involved in the specific implementation method is shown in Table 1:

[0067] Table 1

[0068]

[0069] Example 1

[0070] A light-blocking photochromic resin lens, comprising a lens substrate, a photochromic coating, and a protective layer arranged sequentially;

[0071] The thickness of the lens substrate is 1.2 mm, and the material is acrylic acid.

[0072] The thickness of the color-changing coating is 15 μm. The raw material for preparation is a color-changing coating liquid. The preparation method of the color-changing coating liquid includes: mixing 55 parts by weight of resin (obtained by reacting 15 parts by weight of PTME1000, 10 parts by weight of PCL305, 25 parts by weight of HMDI and 10 parts by weight of IPDI), 7.5 parts by weight of photochromic dye A, 25 parts by weight of solvent (composed of dimethylformamide and N-methylpyrrolidone in a volume ratio of 1:1) and 2.5 parts by weight of catalyst to obtain the color-changing coating liquid.

[0073] The protective layer has a thickness of 20 μm and is prepared from a protective liquid. The preparation method of the protective liquid includes mixing 60 parts by weight of reactive diluent monomer, 20 parts by weight of oligomer, 0.3 parts by weight of photoinitiator, 0.7 parts by weight of surfactant and 12 parts by weight of xylene at room temperature in the dark for 1.5 h to obtain the protective liquid.

[0074] The method for preparing the light-blocking photochromic resin lens provided in this embodiment includes the following steps:

[0075] (1) The lens substrate is immersed in a 25% sodium hydroxide solution under a power of 50mV, and then washed in an alkaline cleaning agent and water in sequence to obtain a pretreated lens substrate.

[0076] (2) Apply the photochromic liquid to the lens substrate with surface pretreatment obtained in step (1), and pre-cur it at 100°C for 100 min to obtain a lens coated with a photochromic coating.

[0077] (3) Apply the protective liquid to the photochromic coating of the lens coated with the photochromic coating obtained in step (2), at 500mW / cm 2 UV curing for 4 seconds yields the light-blocking photochromic resin lens.

[0078] Example 2

[0079] A light-blocking photochromic resin lens, which differs from Example 1 in that photochromic dye B is used instead of photochromic dye A, while the other structures, parameters and preparation methods are the same as in Example 1.

[0080] Example 3

[0081] A light-blocking photochromic resin lens, which differs from Example 1 in that the thickness of the photochromic coating is 10 μm, while the other structures, parameters and preparation methods are the same as in Example 1.

[0082] Example 4

[0083] A light-blocking photochromic resin lens, which differs from Example 1 in that the thickness of the photochromic coating is 20 μm, while the other structures, parameters and preparation methods are the same as in Example 1.

[0084] Example 5

[0085] A light-blocking photochromic resin lens, which differs from Example 1 in that the thickness of the photochromic coating is 5 μm, while the other structures, parameters and preparation methods are the same as in Example 1.

[0086] Example 6

[0087] A light-blocking photochromic resin lens, which differs from Example 1 in that the thickness of the photochromic coating is 30 μm, while the other structures, parameters and preparation methods are the same as in Example 1.

[0088] Comparative Example 1

[0089] A light-blocking photochromic resin lens, which differs from Example 1 in that photochromic dye C is used instead of photochromic dye A, while the other structures, parameters and preparation methods are the same as in Example 1.

[0090] Comparative Example 2

[0091] A light-blocking photochromic resin lens, which differs from Example 1 in that it does not have a protective layer, but its other structure, parameters and preparation method are the same as those of Example 1.

[0092] Comparative Example 3

[0093] A light-blocking photochromic resin lens, which differs from Example 1 in that it does not have a photochromic coating, but its other structure, parameters and preparation method are the same as those of Example 1.

[0094] Performance testing:

[0095] (1) Light transmittance in the faded state: The light transmittance of the lens in the wavelength range of 380-780nm in the faded state; the faded state refers to the state of the lens after fading treatment. The fading treatment includes placing it in a dark environment at 65℃ for 2 hours, and then moving it indoors to room temperature for testing.

[0096] (2) Light transmittance under direct sunlight: The light transmittance of the lens in the wavelength range of 380-780nm under the photochromic state after direct sunlight; the photochromic state under direct sunlight means that the lens is exposed to 50,000 lx illuminance for 15 minutes while the room temperature remains constant.

[0097] (3) Light transmittance under light blocking: The light transmittance of the lens in the wavelength range of 380-780nm under the light blocking photochromic state; the light blocking photochromic state means that the lens is subjected to 15000lx illuminance for 15 minutes while the room temperature remains unchanged.

[0098] The lenses provided in Examples 1-6 and Comparative Examples 1-3 were tested according to the above test method, and the test results are shown in Table 2:

[0099] Table 2

[0100] Light transmittance in faded state / % Light transmittance under direct sunlight / % Light transmittance under shading / % Example 1 91.0 9.1 25.6 Example 2 91.9 9.8 27.7 Example 3 90.4 9.4 25.9 Example 4 90.5 8.3 24.5 Example 5 92.2 13.5 30.5 Example 6 91.5 9.3 26.9 Comparative Example 1 92.1 10.3 39.7 Comparative Example 2 88.8 43.2 55.7 Comparative Example 3 98.1 97.9 98.2

[0101] Note: The data in the table are from tests conducted after the lenses have undergone hardening coating.

[0102] According to the data in Table 2:

[0103] The light-blocking photochromic resin lenses obtained in Examples 1-6 have a light transmittance of 90.4-92.2% in the faded state, indicating good light transmission. The light transmittance under direct sunlight is 8.3-13.5%, indicating good light-blocking effect under direct sunlight. Furthermore, the light transmittance under light-blocking conditions is only 24.5-30.5%, indicating that a certain color-changing depth can be achieved in shaded environments, providing a certain light-blocking effect.

[0104] Comparing the data of Example 1 and Comparative Example 1, it can be seen that the lens obtained by using azo-based photochromic dye (photochromic wavelength of about 395nm) has a good light-blocking effect when exposed to direct sunlight, but the light transmittance is high under light-blocking conditions, and the light-blocking effect becomes worse.

[0105] Comparing Example 1 and Comparative Example 2, it can be seen that the lens obtained without a protective layer has lower light transmittance in the faded state, and higher light transmittance under direct sunlight and under shade. This is because without the protection of the protective layer, the photochromic dye partially fails in subsequent processing.

[0106] Comparing the data from Example 1 and Comparative Example 3, it can be seen that the lens without the photochromic coating has almost no light-blocking effect.

[0107] The applicant declares that this invention illustrates a light-blocking photochromic resin lens and its preparation method through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A photochromic resin ophthalmic lens, characterized in that, The light-shielding color-changing resin lens comprises a lens substrate, a color-changing coating layer and a protective layer arranged in sequence. The color-changing coating layer is prepared from a color-changing coating liquid. The color-changing coating liquid comprises the following components by weight: Resin 50-60 parts by weight Spiropyran photochromic dye 5-10 parts by weight Solvent 20-30 parts by weight Catalyst 1-5 parts by weight Auxiliary agent 1-10 parts by weight The excitation wavelength of the spiropyran photochromic dye is 420-440 nm. The protective layer is prepared from a protective liquid comprising the following components by weight: Active monomer 50-70 parts by weight Oligomer 15-25 parts by weight Surfactant 0.5-1 part by weight Photoinitiator 0.2-0.5 parts by weight Solvent 10-15 parts by weight The preparation method of the light-shielding color-changing resin lens comprises the following steps: (1) Apply the color-changing liquid to the lens substrate and pre-cure to obtain a lens coated with a color-changing coating layer; (2) Apply the protective liquid to the color-changing coating layer of the lens coated with the color-changing coating layer obtained in step (1) and UV-cure to obtain the light-shielding color-changing resin lens.

2. The photochromic resin ophthalmic lens of claim 1, wherein, The material of the lens substrate comprises any one or a combination of at least two of polyurethane, carbonic acid propylene acetic acid, polymethyl acrylate or polycarbonate.

3. The photochromic resin ophthalmic lens of claim 1, wherein, The thickness of the color-changing coating layer is 12-18 μm.

4. The photochromic ophthalmic lens of claim 1, wherein, The thickness of the protective layer is 15-25 μm.

5. The photochromic resin ophthalmic lens of claim 1, wherein, The preparation raw material of the resin comprises polymeric polyol and isocyanate curing agent.

6. The photochromic ophthalmic lens of claim 5, wherein, The polymeric polyol comprises polytetramethylene ether glycol and polycaprolactone triol.

7. The photochromic ophthalmic lens of claim 5, wherein, The isocyanate curing agent comprises HMDI and IPDI.

8. The photochromic ophthalmic lens of claim 1, wherein, The solvent comprises dimethylformamide and / or N-methyl pyrrolidone.

9. The photochromic ophthalmic lens of claim 1, wherein, The catalyst comprises dibutyltin dilaurate.

10. The photochromic ophthalmic lens of claim 1, wherein, The color-changing coating liquid is prepared by the following method, which comprises mixing resin, photochromic dye, catalyst, solvent and auxiliary agent to obtain the color-changing coating liquid.

11. The photochromic ophthalmic lens of claim 1, wherein, The active monomer comprises any one or a combination of at least two of trimethylolpropane triacrylate, ditrimethylolpropane triacrylate, neopentyl glycol diacrylate, propylene glycol tetrahydrofurfuryl acrylate, pentaerythritol triacrylate or pentaerythritol tetraacrylate.

12. The photochromic ophthalmic lens of claim 1, wherein, The oligomer comprises any one or a combination of at least two of bisphenol A type epoxy resin, siloxane epoxy resin or epoxy acrylate oligomer.

13. The photochromic ophthalmic lens of claim 1, wherein, The surfactant comprises N-methylaminopropyltrimethoxysilane and / or γ-glycidoxypropyltrimethoxysilane.

14. The photochromic ophthalmic lens of claim 1, wherein, The photoinitiator comprises diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and / or bisacryloyl phosphine oxide.

15. The photochromic ophthalmic lens of claim 1, wherein, The solvent comprises any one or a combination of at least two of xylene, N,N-dimethylformamide or methyl pyrrolidone.

16. The photochromic ophthalmic lens of claim 1, wherein, The protective liquid is prepared by the following method, which comprises mixing active diluent monomer, oligomer, photoinitiator, surfactant and solvent to obtain the protective liquid.

17. A method of producing a photochromic resin lens according to any one of claims 1 to 16, characterized in that, The preparation method comprises the following steps: (1) Apply the color-changing liquid to the lens substrate and pre-cure to obtain a lens coated with a color-changing coating layer; (2) applying a protective liquid on the discoloration coating of the coated discoloration coating lens obtained in step (1) and UV curing to obtain the photochromic resin lens.

18. The method of claim 17, wherein, The step (1) further comprises a step of surface pretreatment of the lens substrate before coating.

19. The method of claim 18, wherein, The surface pretreatment method specifically comprises: immersing the lens substrate in a sodium hydroxide solution, and then sequentially cleaning in an alkaline cleaning agent and water to complete the surface pretreatment.

20. The method of claim 19, wherein, The mass percentage of sodium hydroxide in the sodium hydroxide solution is 10-30%.

21. The preparation method according to claim 19, characterized in that, The immersion is carried out under ultrasonic conditions.

22. The method of claim 21, wherein, The power of the ultrasonic is 20-90 mV.

23. The preparation method according to claim 19, characterized in that, The immersion time is 5-20 min.

24. The method of claim 17, wherein, The pre-curing temperature of step (1) is 95-125℃.

25. The preparation method according to claim 17, characterized in that, The pre-curing time of step (1) is 30-120 min.

26. The method of claim 17, wherein, The UV curing time of step (2) is 2-5 s.

27. The method of claim 17, wherein The power of the UV curing in step (2) is 400-600 mW / cm 2 .

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