Scratch-resistant modified lens resin material and preparation process thereof

Abstract

The invention relates to a scratch-resistant modified lens resin material and a preparation process thereof. The lens resin material comprises the following components in percentage by mass: 85-95% of CR-39 resin, 1-3% of nano silicon dioxide, 3-7% of a polyurethane cross-linking agent, 0.1-1% of a surfactant and a proper amount of a solvent for preparing nano particle dispersion liquid. Through proportioning and combination of the components, the resin material has excellent scratch resistance and keeps good optical and mechanical properties at the same time. The preparation process comprises the following steps: preparing a nanoparticle dispersion liquid, modifying the CR-39 resin, carrying out injection molding and preliminary curing, taking out and carrying out final curing, polishing the surface of the lens, coating a scratch-resistant coating and carrying out curing. Through the process steps, a firm scratch-resistant coating is formed on the surface of the lens, and the scratch resistance of the lens is further improved.

Description

Technical Field

[0001] The present invention relates to a preparation process of lens resin, and more specifically to a scratch-resistant modified lens resin material and a preparation process thereof. Background Art

[0002] With the increasing demand for vision correction and protection in modern society, the selection and performance requirements of eyeglass lens materials have become increasingly important. Although traditional glass lenses have excellent optical properties, their fragility and weight make them inconvenient in practical applications. In order to overcome these shortcomings, various types of resin lenses have gradually appeared on the market. Compared with glass lenses, resin lenses have the advantages of light weight and not easy to break, but their surface hardness is low and they are easily scratched, which affects their service life and visual effects. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a scratch-resistant modified lens resin material and a preparation process thereof. The specific scheme is as follows:

[0004] A scratch-resistant modified lens resin material, the lens resin material comprising the following components in percentage by mass:

[0005] CR-39 resin: 85-95%;

[0006] Nano silicon dioxide: 1-3%;

[0007] Polyurethane crosslinker: 3-7%;

[0008] Surfactant: 0.1-1%;

[0009] The balance is solvent.

[0010] Furthermore, the preparation process is as follows:

[0011] S1, preparing nanoparticle dispersion;

[0012] S2, modifying CR-39 resin;

[0013] S3: Select a clean and smooth lens mold, wipe the mold surface with acetone to ensure that it is dust-free and oil-free; slowly inject the degassed mixture into the lens mold to ensure that no bubbles remain;

[0014] S4: After the injection molding is completed, the mold is placed in an oven at 60°C for preliminary curing; the lens after preliminary curing is taken out of the mold and placed in an oven at 80°C for final curing;

[0015] S5: Use sandpaper to polish the surface of the lens to remove the uneven surface;

[0016] S6: Curing after applying the anti-scratch coating on the lens surface.

[0017] Furthermore, the steps of S1 for preparing the nanoparticle dispersion are: adding nano-silicon dioxide into ethanol; adding a surfactant, and treating with an ultrasonic processor for 30 minutes to fully disperse the nano-silicon dioxide in the ethanol.

[0018] Further, the steps of modifying CR-39 resin by S2 are as follows:

[0019] S1. Mixing the resin matrix and the modifier: Add the polyurethane crosslinker to the CR-39 resin and stir evenly; slowly add the prepared nano-silica dispersion and continue stirring for 1 hour to ensure that the nanoparticles are evenly distributed in the resin;

[0020] S2. Degassing of the mixture: The mixture was placed in a vacuum degassing machine with the vacuum degree set to 0.1 MPa for 30 minutes to remove bubbles in the mixture.

[0021] Furthermore, the steps of curing after coating the anti-scratch coating on the lens surface in S6 are as follows:

[0022] S1: Spray or brush the silane coating evenly on the lens surface to ensure uniform coating thickness;

[0023] S2: Put the coated lens into an oven at 120°C for curing; the curing time is 1 hour;

[0024] S3: After curing is completed, the lens is taken out of the oven and allowed to cool naturally at room temperature.

[0025] Furthermore, in S4, the initial curing time is 2 h and the final curing time is 4 h.

[0026] Furthermore, the coating thickness is 10-15 μm.

[0027] Beneficial effects:

[0028] The present invention provides a scratch-resistant modified lens resin material and a preparation process thereof, which has the following beneficial effects:

[0029] (1) By introducing nano-silicon dioxide and a polyurethane cross-linking agent into the CR-39 resin, the lens material of the present invention has significantly improved scratch resistance. The hardness and wear resistance of the nano-silicon dioxide effectively enhance the surface hardness of the resin material, reducing damage caused by friction and scratches in daily use.

[0030] (2) Each component in the present invention is precisely proportioned by mass percentage, so that the resin material has excellent optical transparency and low refractive index while maintaining high scratch resistance, thereby ensuring the light transmittance and visual effect of the lens.

[0031] (3) Due to the introduction of the polyurethane cross-linking agent, the lens material of the present invention forms a cross-linked structure after curing, so that the resin material has better mechanical strength and toughness, is not easy to break or deform, and prolongs the service life of the lens.

[0032] (4) In the preparation process, the nanoparticle dispersion preparation step is processed by an ultrasonic processor so that the nano-silicon dioxide can be fully and evenly dispersed in ethanol, thereby ensuring its uniform distribution in the resin, avoiding agglomeration, and improving the uniformity and stability of the material. In the modification step of the CR-39 resin, the bubbles in the mixture are effectively removed by degassing in a vacuum degassing machine, avoiding the occurrence of pores or unevenness in the finished product, and ensuring the quality of the final product.

[0033] (5) After the anti-scratch coating is applied, the surface hardness and wear resistance of the lens are further improved. By evenly spraying the silane coating and curing it at 120°C for 1 hour, the coating thickness is uniform and firm, ensuring the stability and durability of the lens in long-term use. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0035] Embodiment 1:

[0036] The lens resin material includes the following components in percentage by mass:

[0037] CR-39 resin: 90%

[0038] Nano silicon dioxide: 2%

[0039] Polyurethane crosslinker: 6%

[0040] Surfactant: 0.5%

[0041] The balance is ethanol

[0042] The preparation process is as follows:

[0043] 1. Preparation of Nanoparticle Dispersion

[0044] Add 2 g of nano-silica to 100 mL of ethanol.

[0045] 0.5 g of surfactant was added.

[0046] The nano-silica was fully dispersed in ethanol by using an ultrasonic processor for 30 minutes.

[0047] 2. Modification of CR-39 resin

[0048] Add 6g of polyurethane crosslinking agent to 90g of CR-39 resin and stir evenly.

[0049] Slowly add the prepared nano-silica dispersion and continue stirring for 1 hour to ensure that the nanoparticles are evenly distributed in the resin.

[0050] The mixture was placed in a vacuum degassing machine with the vacuum degree set to -0.1 MPa and the degassing time set to 30 minutes to remove bubbles in the mixture.

[0051] 3. Injection molding

[0052] Choose a clean and smooth lens mold and wipe the mold surface with acetone to ensure it is dust-free and oil-free.

[0053] Slowly inject the degassed mixture into the lens mold, making sure no bubbles remain.

[0054] 4. Curing

[0055] After the injection molding is completed, the mold is placed in an oven at 60°C for preliminary curing for 2 hours.

[0056] The lens after preliminary curing was taken out from the mold and placed in an oven at 80°C for final curing for 4 hours.

[0057] 5. Polishing

[0058] Use 1000 grit sandpaper to polish the surface of the lens to remove any uneven surfaces.

[0059] 6. Apply anti-scratch coating**

[0060] Spray or brush the silane coating evenly on the lens surface, ensuring that the coating thickness is uniformly 10-15μm.

[0061] The coated lens was placed in an oven at 120° C. for curing for 1 hour.

[0062] After curing is completed, the lens is taken out of the oven and allowed to cool naturally at room temperature.

[0063] Embodiment 2:

[0064] The lens resin material includes the following components in percentage by mass:

[0065] CR-39 resin: 88%

[0066] Nano silicon dioxide: 3%

[0067] Polyurethane crosslinker: 5%

[0068] Surfactant: 0.2%

[0069] The balance is ethanol

[0070] The preparation process is as follows:

[0071] 1. Preparation of Nanoparticle Dispersion

[0072] Add 3 g of nano-silica to 100 mL of ethanol.

[0073] 0.2 g of surfactant was added.

[0074] The nano-silica was fully dispersed in ethanol by using an ultrasonic processor for 30 minutes.

[0075] 2. Modification of CR-39 resin

[0076] Add 5g of polyurethane crosslinking agent to 88g of CR-39 resin and stir evenly.

[0077] Slowly add the prepared nano-silica dispersion and continue stirring for 1 hour to ensure that the nanoparticles are evenly distributed in the resin.

[0078] The mixture was placed in a vacuum degassing machine with the vacuum degree set to -0.1 MPa and the degassing time set to 30 minutes to remove bubbles in the mixture.

[0079] 3. Injection molding

[0080] Choose a clean and smooth lens mold and wipe the mold surface with acetone to ensure it is dust-free and oil-free.

[0081] Slowly inject the degassed mixture into the lens mold, making sure no bubbles remain.

[0082] 4. Curing

[0083] After the injection molding is completed, the mold is placed in an oven at 60°C for preliminary curing for 2 hours.

[0084] The lens after preliminary curing was taken out from the mold and placed in an oven at 80°C for final curing for 4 hours.

[0085] 5. Polishing

[0086] Use 1000 grit sandpaper to polish the surface of the lens to remove any uneven surfaces.

[0087] 6. Apply anti-scratch coating

[0088] Spray or brush the silane coating evenly on the lens surface, ensuring that the coating thickness is uniformly 10-15μm.

[0089] The coated lens was placed in an oven at 120° C. for curing for 1 hour.

[0090] After curing is completed, the lens is taken out of the oven and allowed to cool naturally at room temperature.

[0091] Embodiment 3:

[0092] The lens resin material includes the following components in percentage by mass:

[0093] CR-39 resin: 95%

[0094] Nano silicon dioxide: 1%

[0095] Polyurethane crosslinker: 3%

[0096] Surfactant: 0.1%

[0097] The balance is ethanol

[0098] The preparation process is as follows:

[0099] 1. Preparation of Nanoparticle Dispersion

[0100] Add 1 g of nano-silica to 100 mL of ethanol.

[0101] 0.1 g of surfactant was added.

[0102] The nano-silica was fully dispersed in ethanol by using an ultrasonic processor for 30 minutes.

[0103] 2. Modification of CR-39 resin

[0104] Add 3g of polyurethane crosslinking agent to 95g of CR-39 resin and stir well.

[0105] Slowly add the prepared nano-silica dispersion and continue stirring for 1 hour to ensure that the nanoparticles are evenly distributed in the resin.

[0106] The mixture was placed in a vacuum degassing machine with the vacuum degree set to -0.1 MPa and the degassing time set to 30 minutes to remove bubbles in the mixture.

[0107] 3. Injection molding

[0108] Choose a clean and smooth lens mold and wipe the mold surface with acetone to ensure it is dust-free and oil-free.

[0109] Slowly inject the degassed mixture into the lens mold, making sure no bubbles remain.

[0110] 4. Curing

[0111] After the injection molding is completed, the mold is placed in an oven at 60°C for preliminary curing for 2 hours.

[0112] The lens after preliminary curing was taken out from the mold and placed in an oven at 80°C for final curing for 4 hours.

[0113] 5. Polishing

[0114] Use 1000 grit sandpaper to polish the surface of the lens to remove any uneven surfaces.

[0115] 6. Apply anti-scratch coating

[0116] Spray or brush the silane coating evenly on the lens surface, ensuring that the coating thickness is uniformly 10-15μm.

[0117] The coated lens was placed in an oven at 120° C. for curing for 1 hour.

[0118] After curing is completed, the lens is taken out of the oven and allowed to cool naturally at room temperature.

[0119] Comparative Example:

[0120] Traditional resin lenses

[0121] The scratch resistance of the resin lenses of Examples 1 to 3 and the comparative example was tested, and the test data are as follows:

[0122] sample Scratch resistance (H) Example 1 5H Example 2 6H Example 3 4H Comparative Example 2H

[0123] It can be seen from the above table that the scratch resistance of the embodiment is improved compared with the comparative example.

[0124] As a further improvement, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A scratch-resistant modified lens resin material, It is characterized in that The lens resin material includes the following components in percentage by mass: CR-39 resin: 85-95%; Nano silicon dioxide: 1-3%; Polyurethane crosslinker: 3-7%; Surfactant: 0.1-1%; The balance is solvent.

2. A process for preparing a scratch-resistant modified lens resin material, It is characterized in that The preparation process is as follows: S1, preparing nanoparticle dispersion; S2, modifying CR-39 resin; S3: Select a clean and smooth lens mold, wipe the mold surface with acetone to ensure that it is dust-free and oil-free; slowly inject the degassed mixture into the lens mold to ensure that no bubbles remain; S4: After the injection molding is completed, the mold is placed in an oven at 60°C for preliminary curing; the lens after preliminary curing is taken out of the mold and placed in an oven at 80°C for final curing; S5: Use sandpaper to polish the surface of the lens to remove the uneven surface; S6: Curing after applying the anti-scratch coating on the lens surface.

3. The process for preparing a scratch-resistant modified lens resin material according to claim 2, It is characterized in that S1 The steps of preparing the nanoparticle dispersion are: adding nano-silicon dioxide into ethanol; adding a surfactant, and treating with an ultrasonic processor for 30 minutes to fully disperse the nano-silicon dioxide in the ethanol.

4. The process for preparing a scratch-resistant modified lens resin material according to claim 2, It is characterized in that S2 The steps of modifying CR-39 resin are as follows: S1. Mixing the resin matrix and the modifier: Add the polyurethane crosslinker to the CR-39 resin and stir evenly; slowly add the prepared nano-silica dispersion and continue stirring for 1 hour to ensure that the nanoparticles are evenly distributed in the resin; S2. Degassing of the mixture: The mixture was placed in a vacuum degassing machine with the vacuum degree set to 0.1 MPa for 30 minutes to remove bubbles in the mixture.

5. The process for preparing a scratch-resistant modified lens resin material according to claim 2, It is characterized in that The steps for curing the S6 lens after applying the anti-scratch coating on the lens surface are as follows: S1: Spray or brush the silane coating evenly on the lens surface to ensure uniform coating thickness; S2: Put the coated lens into an oven at 120°C for curing; the curing time is 1 hour; S3: After curing is completed, the lens is taken out of the oven and allowed to cool naturally at room temperature.

6. The process for preparing a scratch-resistant modified lens resin material according to claim 2, It is characterized in that The initial curing time in S4 is 2 h and the final curing time is 4 h.

7. The process for preparing a scratch-resistant modified lens resin material according to claim 5, It is characterized in that The coating thickness is 10-15 μm.