Preparation process of anti-fog polarized lens

Abstract

The invention discloses a preparation process of an anti-fog polarized lens. The preparation process comprises the steps of base material selection and treatment, polarized layer preparation, anti-fog layer preparation, protection layer integration and quality detection. The base material adopts a blending material of PLA and PBAT, and a columnar microstructure is formed by processing through a nanoimprint technology; the polarizing layer is prepared by laminating a pre-stretched PVA polarizing film and an EVA resin hot melt adhesive layer; the anti-fog layer is formed by copolymerized hydrogel of NIPAM (N-isopropylacrylamide) and acrylic acid through layer-by-layer self-assembly; and the protective layer is integrated with a wear-resistant layer containing graphene oxide and a SiO2 / TiO2 alternating antireflection film. The lens prepared by the process has the characteristics of lasting antifogging effect, stable polarization performance, high durability and environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of polarized lens technology, specifically, it relates to a manufacturing process for anti-fog polarized lenses. Background Technology

[0002] Polarized lenses effectively filter glare and are widely used in sunglasses, sports glasses, and other fields. However, in environments with large temperature differences, the lens surface is prone to fogging, affecting vision and causing inconvenience to users. Traditional anti-fog polarized lens manufacturing processes have many shortcomings, such as short-lasting anti-fog effect, unstable polarization performance, and poor lens durability. Meanwhile, with increasing environmental awareness, the requirements for the biodegradability of lens materials are also becoming more stringent. Currently, most lenses use traditional resin materials, which are difficult to degrade and impose a certain burden on the environment. Therefore, developing a manufacturing process for anti-fog polarized lenses that offers excellent anti-fog performance, stable polarization performance, high durability, and environmental friendliness is of great significance. Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is to provide a manufacturing process for anti-fog polarized lenses, which achieves the characteristics of long-lasting anti-fog effect, stable polarization performance, high durability and environmental protection.

[0004] To achieve the above technical objectives, this invention discloses a long-lasting anti-fog, weather-resistant polarized lens, comprising: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) is selected as the substrate, wherein the mass ratio of PLA to PBAT is 7:3. Step (2) Preparation of polarizing layer: Select a pre-stretched PVA polarizing film with a thickness of 25μm, and attach it to the surface of the substrate treated in step (1) through a 3μm thick EVA resin hot melt adhesive layer. Hot press at 80℃ and 0.3MPa pressure for 10 minutes, and then let it stand in a 60℃ oven for 2 hours to cure and shape. Step (3) Preparation of antifog layer: The antifog layer is prepared by photoinitiated polymerization using a copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) with a molar ratio of NIPAM to AA of 9:1. The lens treated in step (2) is alternately immersed in a 0.5% hydrogel solution with pH=7 and a 0.1% polylysine solution for 5 minutes each time, and a total of 10 layers are assembled to form an antifog layer with a thickness of 15 μm. Step (4) Protective layer integration: Add 0.5% graphene oxide (GO) to the silicone resin, ultrasonically disperse for 30 minutes to form a dispersion, and coat it on the surface of the lens after step (3) to form a wear-resistant layer; use magnetron sputtering technology to deposit an alternating SiO2 / TiO2 antireflection film on the surface of the wear-resistant layer, wherein the antireflection film consists of 3 layers with a total thickness of 500nm, the sputtering conditions are argon atmosphere, power 200W, vacuum degree 1Pa, and sputtering time for each layer is 15 minutes.

[0005] According to one embodiment of the present invention, the light transmittance of the above-mentioned blended material is ≥90%.

[0006] According to an embodiment of the present invention, the above step (1) further includes fabricating columnar microstructures with a period of 500 nm and a depth of 300 nm on the surface of the substrate by nanoimprinting technology. The process involves heating the substrate to 60°C, imprinting it with a nickel nanotemplate at a pressure of 5 MPa, holding it for 10 seconds, and then cooling and demolding it.

[0007] According to one embodiment of the present invention, the pre-stretched PVA polarizing film in step (2) above has been iodine dyed and oriented, and the polarization degree of the lens after bonding is ≥99%.

[0008] According to one embodiment of the present invention, the lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) in step (3) above is 32°C.

[0009] According to one embodiment of the present invention, the adhesion between the antifog layer and the polarizing layer prepared in step (3) above reaches level 5B in the cross-cut test.

[0010] According to one embodiment of the present invention, the wear-resistant layer described in step (4) above is subjected to Taber wear resistance test, and the weight loss is ≤3mg / 1000 cycles, and the hardness reaches 4H.

[0011] According to one embodiment of the present invention, after the anti-reflection coating is deposited in step (4) above, the visible light transmittance of the lens is ≥40%.

[0012] Compared with the prior art, the present invention can achieve the following technical effects: The present invention uses a blend of polylactic acid (PLA) and polybutylene adipate (PBAT) as the base material, which has good biodegradability and good environmental performance.

[0013] By creating columnar microstructures on the substrate surface using nanoimprint technology, the contact area of ​​subsequent coatings is increased, improving coating adhesion. At the same time, the "lotus effect" helps the anti-fog layer reduce moisture residue and enhances the anti-fog effect.

[0014] The polarizing layer is prepared by bonding a pre-stretched PVA polarizing film with a hot melt adhesive layer. The process is simple, easy to operate, and the polarization performance is stable.

[0015] The anti-fog layer utilizes a copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA). NIPAM is temperature-sensitive, with a lower critical dissolution temperature of 32°C. Below 32°C, the hydrogel hydrophilically swells, rapidly absorbing moisture to form a water film; above 32°C, the hydrogel hydrophobically shrinks, reducing surface moisture residue. This adapts to anti-fog requirements under different temperature environments, ensuring long-lasting anti-fog performance. Furthermore, the anti-fog layer, prepared through layer-by-layer self-assembly, achieves an adhesion rating of 5B with the polarizing layer, ensuring a strong bond.

[0016] The addition of graphene oxide (GO) to silicone resin to form a wear-resistant layer provides excellent mechanical properties and a hardness of 4H, improving the lens's durability. An alternating SiO2 / TiO2 antireflective coating deposited on the wear-resistant layer surface increases the lens's visible light transmittance to ≥40%, reducing reflection interference and enhancing optical performance.

[0017] 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

[0018] 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 manufacturing process of the anti-fog polarized lens according to an embodiment of the present invention. Detailed Implementation

[0019] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings and embodiments, 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.

[0020] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating the manufacturing process of the anti-fog polarized lens according to an embodiment of the present invention. Example 1

[0021] A manufacturing process for an anti-fog polarized lens includes the following steps: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) was selected as the substrate, with a mass ratio of PLA to PBAT of 7:3. The light transmittance of this blend was 92%. Columnar microstructures with a period of 500 nm and a depth of 300 nm were fabricated on the substrate surface using nanoimprinting technology. The treatment process involved heating the substrate to 60°C, imprinting it with a nickel nanotemplate at a pressure of 5 MPa, holding for 10 seconds, and then cooling and demolding.

[0022] Step (2) Polarizing layer preparation: A pre-stretched PVA polarizing film with a thickness of 25 μm was selected. This polarizing film has been iodine-stained and oriented. It was bonded to the surface of the substrate treated in step (1) with a 3 μm thick EVA resin hot melt adhesive layer, and hot-pressed at 80℃ and 0.3MPa for 10 minutes. Then it was cured and shaped by standing in a 60℃ oven for 2 hours. The polarization degree of the lens after bonding is 99.2%.

[0023] Step (3) Preparation of the antifog layer: A copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) was used, with a molar ratio of NIPAM to AA of 9:1. The lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) was 32℃. The layer was prepared by photoinitiated polymerization. The lens treated in step (2) was alternately immersed in a 0.5% hydrogel solution (pH=7) and a 0.1% polylysine solution for 5 minutes each time, and a total of 10 layers were assembled to form an antifog layer with a thickness of 15μm. The adhesion level between the antifog layer and the polarizing layer was tested to reach 5B (cross-cut test).

[0024] Step (4) Protective Layer Integration: 0.5% graphene oxide (GO) was added to the silicone resin and ultrasonically dispersed for 30 minutes to form a dispersion. This dispersion was then coated onto the lens surface treated in step (3) to form a wear-resistant layer. Taber abrasion resistance testing showed that the wear-resistant layer had a weight loss of 2.8 mg / 1000 cycles and a hardness of 4H (pencil hardness). A SiO2 / TiO2 alternating antireflective coating was deposited on the wear-resistant layer surface using magnetron sputtering technology. The antireflective coating consisted of three layers with a total thickness of 500 nm. The sputtering conditions were an argon atmosphere, a power of 200 W, a vacuum degree of 1 Pa, and a sputtering time of 15 minutes per layer. After the antireflective coating was deposited, the visible light transmittance of the lens was 41%.

[0025] Quality testing: According to GB / T 19277.1-2011 standard, in a 30℃ composting environment, the degradation rate of the substrate within 6 months is 62%; after high and low temperature cycling (-40℃~70℃, 50 cycles), the polarization degree of the lens decreases by 0.8%. Example 2

[0026] A manufacturing process for an anti-fog polarized lens includes the following steps: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) was selected as the substrate, with a mass ratio of PLA to PBAT of 6:4. The transmittance of this blend was 91%. Columnar microstructures with a period of 500 nm and a depth of 300 nm were fabricated on the substrate surface using nanoimprinting technology. The process involved heating the substrate to 58°C, imprinting it with a nickel nanotemplate at a pressure of 4.8 MPa for 12 seconds, and then cooling and demolding.

[0027] Step (2) Polarizing layer preparation: A 25μm thick pre-stretched PVA polarizing film was selected, which had undergone iodine staining and orientation. A 3μm thick EVA resin hot melt adhesive layer was applied to the substrate surface treated in step (1). The film was hot-pressed at 78℃ and 0.28MPa for 12 minutes, and then cured in a 58℃ oven for 2.5 hours. The polarization degree of the lens after bonding was 99.1%. Step (3) Preparation of the antifog layer: A copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) was used, with a molar ratio of NIPAM to AA of 8:2. The lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) was 32℃. The antifog layer was prepared by photoinitiated polymerization. The lens treated in step (2) was alternately immersed in a 0.6% hydrogel solution (pH=7.2) and a 0.12% polylysine solution for 6 minutes each time, assembling a total of 9 layers to form an antifog layer with a thickness of 14μm. The adhesion level between the antifog layer and the polarizing layer was tested to reach 5B (cross-cut test).

[0028] Step (4) Protective Layer Integration: 0.6% graphene oxide (GO) was added to the silicone resin and ultrasonically dispersed for 35 minutes to form a dispersion. This dispersion was then coated onto the lens surface treated in step (3) to form a wear-resistant layer. Taber abrasion resistance testing showed that the wear-resistant layer had a weight loss of 2.7 mg / 1000 cycles and a hardness of 4H (pencil hardness). A SiO2 / TiO2 alternating antireflective coating was deposited on the wear-resistant layer surface using magnetron sputtering technology. The antireflective coating consisted of three layers with a total thickness of 500 nm. The sputtering conditions were an argon atmosphere, a power of 190 W, a vacuum of 1.2 Pa, and a sputtering time of 16 minutes per layer. After the antireflective coating was deposited, the visible light transmittance of the lens was 40.5%.

[0029] Quality testing: According to GB / T 19277.1-2011 standard, in a 30℃ composting environment, the degradation rate of the substrate within 6 months is 63%; after high and low temperature cycling (-40℃~70℃, 50 cycles), the polarization degree of the lens decreases by 0.9%. Example 3

[0030] A manufacturing process for an anti-fog polarized lens includes the following steps: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) was selected as the substrate, with a mass ratio of PLA to PBAT of 8:2. The transmittance of this blend was 93%. Columnar microstructures with a period of 500 nm and a depth of 300 nm were fabricated on the substrate surface using nanoimprinting technology. The process involved heating the substrate to 62°C, imprinting it with a nickel nanotemplate at a pressure of 5.2 MPa for 8 seconds, and then cooling and demolding.

[0031] Step (2) Polarizing layer preparation: A pre-stretched PVA polarizing film with a thickness of 25 μm was selected. This polarizing film has been iodine-stained and oriented. It was bonded to the surface of the substrate treated in step (1) with a 3 μm thick EVA resin hot melt adhesive layer. It was hot-pressed at 82℃ and 0.32MPa for 8 minutes, and then cured and shaped in a 62℃ oven for 1.5 hours. The polarization degree of the lens after bonding was 99.3%.

[0032] Step (3) Preparation of the antifog layer: A copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) was used, with a molar ratio of NIPAM to AA of 10:1. The lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) was 32℃. The antifog layer was prepared by photoinitiated polymerization. The lens treated in step (2) was alternately immersed in a 0.4% hydrogel solution (pH=6.8) and a 0.08% polylysine solution for 4 minutes each time, assembling a total of 11 layers to form an antifog layer with a thickness of 16μm. The adhesion level between the antifog layer and the polarizing layer was tested to reach 5B (cross-cut test).

[0033] Step (4) Protective Layer Integration: 0.4% graphene oxide (GO) was added to the silicone resin and ultrasonically dispersed for 25 minutes to form a dispersion. This dispersion was then coated onto the lens surface treated in step (3) to form a wear-resistant layer. The Taber wear resistance test showed that the wear-resistant layer had a weight loss of 2.9 mg / 1000 cycles and a hardness of 4H (pencil hardness). A SiO2 / TiO2 alternating antireflective coating was deposited on the wear-resistant layer surface using magnetron sputtering technology. The antireflective coating consisted of three layers with a total thickness of 500 nm. The sputtering conditions were an argon atmosphere, a power of 210 W, a vacuum of 0.8 Pa, and a sputtering time of 14 minutes per layer. After the antireflective coating was deposited, the visible light transmittance of the lens was 41.5%.

[0034] Quality testing: According to GB / T 19277.1-2011 standard, in a 30℃ composting environment, the degradation rate of the substrate within 6 months is 61%; after high and low temperature cycling (-40℃~70℃, 50 cycles), the polarization degree of the lens decreases by 0.7%. Example 4

[0035] A manufacturing process for an anti-fog polarized lens includes the following steps: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) was selected as the substrate, with a mass ratio of PLA to PBAT of 7.5:2.5. The transmittance of this blend was 92.5%. Columnar microstructures with a period of 500 nm and a depth of 300 nm were fabricated on the substrate surface using nanoimprinting technology. The process involved heating the substrate to 59°C, imprinting it with a nickel nanotemplate at a pressure of 4.9 MPa for 11 seconds, and then cooling and demolding.

[0036] Step (2) Polarizing layer preparation: A pre-stretched PVA polarizing film with a thickness of 25 μm was selected. This polarizing film has been iodine-stained and oriented. It was bonded to the surface of the substrate treated in step (1) with a 3 μm thick EVA resin hot melt adhesive layer. It was hot-pressed at 79℃ and 0.29 MPa for 11 minutes, and then cured and shaped in an oven at 59℃ for 2.2 hours. The polarization degree of the lens after bonding was 99.25%.

[0037] Step (3) Preparation of the antifog layer: A copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) was used, with a molar ratio of NIPAM to AA of 8.5:1.5. The lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) was 32℃. The antifog layer was prepared by photoinitiated polymerization. The lens treated in step (2) was alternately immersed in a 0.55% hydrogel solution (pH=6.9) and a 0.09% polylysine solution for 5.5 minutes each time, assembling a total of 10 layers to form an antifog layer with a thickness of 15.5 μm. The adhesion level between the antifog layer and the polarizing layer was tested to reach 5B (cross-cut test).

[0038] Step (4) Protective Layer Integration: 0.55% graphene oxide (GO) was added to the silicone resin and ultrasonically dispersed for 32 minutes to form a dispersion. This dispersion was then coated onto the lens surface treated in step (3) to form a wear-resistant layer. Taber abrasion resistance testing showed that the wear-resistant layer had a weight loss of 2.75 mg / 1000 cycles and a hardness of 4H (pencil hardness). A SiO2 / TiO2 alternating antireflective coating was deposited on the wear-resistant layer surface using magnetron sputtering technology. The antireflective coating consisted of three layers with a total thickness of 500 nm. The sputtering conditions were an argon atmosphere, a power of 195 W, a vacuum of 1.1 Pa, and a sputtering time of 15.5 minutes per layer. After the antireflective coating was deposited, the visible light transmittance of the lens was 41.2%.

[0039] Quality testing: According to GB / T 19277.1-2011 standard, in a 30℃ composting environment, the degradation rate of the substrate within 6 months is 62.5%; after high and low temperature cycling (-40℃~70℃, 50 cycles), the polarization degree of the lens decreases by 0.85%.

[0040] 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 manufacturing process for anti-fog polarized lenses, characterized in that, include: Step (1) Substrate selection and treatment: A blend of polylactic acid (PLA) and polybutylene adipate (PBAT) is selected as the substrate, wherein the mass ratio of PLA to PBAT is 7:

3. Step (2) Preparation of polarizing layer: Select a pre-stretched PVA polarizing film with a thickness of 25μm, and attach it to the surface of the substrate treated in step (1) through a 3μm thick EVA resin hot melt adhesive layer. Hot press at 80℃ and 0.3MPa pressure for 10 minutes, and then let it stand in a 60℃ oven for 2 hours to cure and shape. Step (3) Preparation of antifog layer: The antifog layer is prepared by photoinitiated polymerization using a copolymer hydrogel of N-isopropylacrylamide (NIPAM) and acrylic acid (AA) with a molar ratio of NIPAM to AA of 9:

1. The lens treated in step (2) is alternately immersed in a 0.5% hydrogel solution with pH=7 and a 0.1% polylysine solution for 5 minutes each time, and a total of 10 layers are assembled to form an antifog layer with a thickness of 15 μm. Step (4) Protective layer integration: Add 0.5% graphene oxide (GO) to the silicone resin, ultrasonically disperse for 30 minutes to form a dispersion, and coat it on the surface of the lens after step (3) to form a wear-resistant layer; use magnetron sputtering technology to deposit an alternating SiO2 / TiO2 antireflection film on the surface of the wear-resistant layer, wherein the antireflection film consists of 3 layers with a total thickness of 500nm, the sputtering conditions are argon atmosphere, power 200W, vacuum degree 1Pa, and sputtering time for each layer is 15 minutes.

2. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, The light transmittance of the blended material described in step (1) is ≥90%.

3. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, Step (1) also includes the fabrication of columnar microstructures with a period of 500 nm and a depth of 300 nm on the surface of the substrate by nanoimprinting technology. The process involves heating the substrate to 60°C, imprinting it with a nickel nanotemplate, applying a pressure of 5 MPa, holding it for 10 seconds, and then cooling and demolding it.

4. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, The pre-stretched PVA polarizing film mentioned in step (2) has been iodine-stained and oriented, and the polarization degree of the lens after bonding is ≥99%.

5. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, The lower critical dissolution temperature of N-isopropylacrylamide (NIPAM) mentioned in step (3) is 32°C.

6. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, The adhesion between the antifog layer and the polarizing layer prepared in step (3) reached level 5B in the cross-cut test.

7. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, The wear-resistant layer described in step (4) was tested by Taber abrasion test and showed a weight loss of ≤3mg / 1000 cycles and a hardness of 4H.

8. The manufacturing process for anti-fog polarized lenses according to claim 1, characterized in that, After the anti-reflection coating is deposited in step (4), the visible light transmittance of the lens is ≥40%.

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