PHOTOCHROMIC LENS WITH BIFOCAL FILM LAYER AND PREPARATION METHOD FOR PHOTOCHROMIC LENS

Abstract

The present disclosure relates to a preparation method for a photochromic lens with a bifocal film layer. A photochromic lens with a bifocal film layer includes a substrate, a treatment layer, and a photochromic layer from inside to outside, where the photochromic layer is cured on a surface of the treatment layer by means of ultraviolet irradiation. According to the preparation method for a photochromic lens having a bifocal film layer provided in the present disclosure, a bifocal lens is used as a lens substrate, and photochromic and bifocal technologies are combined to overcome the defect of non-uniformity of a bifocal film layer caused by a spin-coating method, such that a photochromic layer can be uniformly attached to a surface of the lens substrate. Thus, uniform photochromism and excellent performance are achieved, and it can be ensured that the surface shape luminosity of the bifocal lens substrate is not affected.

Claims

1. A photochromic lens with a bifocal film layer, comprising a substrate (1), a treatment layer (2) and a photochromic layer (3) from inside to outside, wherein the photochromic layer (3) is cured on a surface of the treatment layer (2) by means of ultraviolet irradiation, and the substrate (1) is an E-line bifocal lens or a flat-top bifocal lens.

2. The photochromic lens with a bifocal film layer according to claim 1, wherein the substrate (1) comprises a main lens (11) and a segment lens (12), the main lens (11) is a distance-viewing structure, and the segment lens (12) is a near-viewing part.

3. The photochromic lens with a bifocal film layer according to claim 1, wherein materials of the treatment layer (2) comprise the following components in parts by weight: 50-80 parts of bisphenol A epoxy acrylic resin, 5-8 parts of dioctyl adipate, 2-5 parts of vinyl trimethoxy silane, and 1-3 parts of tetrabutylammonium chloride.

4. The photochromic lens with a bifocal film layer according to claim 1, wherein the photochromic layer (3) comprises the following components in mass fraction: 30%-70% of bisphenol A dimethacrylate, 10%-60% of poly(ethylene glycol) diacrylate, 10%-30% of polyfunctional acrylate monomer, and the rest of photoinitiator, with a total of 100%.

5. The photochromic lens with a bifocal film layer according to claim 1, wherein a transparent polymer material for optics is any one of polycarbonate, polymethylmethacrylate, or polymer alloy.

6. A preparation method for the photochromic lens with a bifocal film layer according to claim 1, comprising the following operation steps: S1: uniformly spin-coating a treatment layer (2) on surface of a substrate (1); S2: placing the substrate (1) obtained in Step S1 in an external mold adapted to a shape and structure of the substrate (1), reserving a gap between the external mold and the substrate (1), and fixing the external and the substrate with an adhesive tape; S3: injecting a photochromic material into the gap of Step S2 to fill and seal the gap; S4: curing the photochromic material by means of ultraviolet irradiation to form a photochromic layer (3); and S5: demolding to obtain the photochromic material with a bifocal film layer.

7. The preparation method for the photochromic lens with a bifocal film layer according to claim 6, comprising the following operation steps: S1: uniformly spin-coating the treatment layer (2) on the surface of the substrate (1); S2: placing the substrate (1) obtained in Step S1 in the external mold adapted to the shape and structure of the substrate (1), reserving a gap of 5 mm between the external mold and the substrate (1), and fixing the external and the substrate with an adhesive tape; S3: injecting the photochromic material into the gap of Step S2, adjusting the gap to 4 mm when the photochromic material is filled to ?-? of the volume of the gap, wherein the gap is a thickness of the photochromic layer, and continuously injecting the photochromic material until the gap is filled and sealed with the photochromic material; S4: curing the photochromic material by means of ultraviolet irradiation for 2 min to form the photochromic layer (3); and S5: demolding to obtain the photochromic material with a bifocal film layer.

8. The preparation method for the photochromic lens with a bifocal film layer according to claim 7, wherein in Step S1, the treatment layer (2) is uniformly spin-coated on the surface of the substrate (1), and the substrate coated with the treatment layer (2) is irradiated with an ultraviolet curing light source for 1 min.

9. The preparation method for the photochromic lens with a bifocal film layer according to claim 8, wherein in Step S3, an injection hole is punched in the adhesive tape, the photochromic material is injected into the gap through the injection hole with a syringe, and then the hole is sealed with the adhesive tape.

10. The preparation method for the photochromic lens with a bifocal film layer according to claim 8, wherein in Step S3, a vent hole is punched in the adhesive tape, and the vent hole is adjacent to the injection hole; when the photochromic material overflows from the vent hole, the gap is determined to be filled with the photochromic material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG. 1 is a flow diagram of a preparation method according to the present disclosure;

[0046] FIG. 2 is a schematic diagram of a preparation process according to Embodiments 1-5 of the present disclosure;

[0047] FIG. 3 is a structural schematic diagram of a substrate according to Embodiment 1 of the present disclosure;

[0048] FIG. 4 is a structural schematic diagram of a substrate according to Embodiments 2-5 of the present disclosure;

[0049] FIG. 5 shows photochromic time transmittance of Embodiment 1 and Comparative embodiment.

[0050] In the drawings:

[0051] 1substrate; 2treatment layer; 3photochromic layer; 11main lens; 12segment lens.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] In order to further illustrate the technical means and efficacy adopted by the present disclosure to achieve the intended purpose of the present disclosure, the specific embodiments, characteristics and efficacy of the preparation method for a photochromic lens with a bifocal film layer provided in accordance with the present disclosure are described in detail as follows.

[0053] Materials used in the embodiment are commercially available.

[0054] The materials are from the following table:

TABLE-US-00001 Material Manufacturer Propoxylated bisphenol A BASF (Original Cognis) dimethacrylate containing 2-20 repeating units of propoxy Poly(ethylene glycol) diacrylate BASF (Original Cognis) containing 2-20 repeating units of propoxy Pentaerythritol tetraacrylate BASF (Original Cognis) Photoinitiator CAC Nantong Chemical Bisphenol A epoxy acrylic resin BASF (Original Cognis) Dioctyl adipate Yuanli Chemical Vinyl trimethoxy silane Nanjing Capatue Chemical Tetrabutylammonium chloride Titan Science and technology (Reagent) Ethoxylated bisphenol A BASF (Original Cognis) dimethacrylate containing 2-20 repeating units of ethoxy Poly(ethylene glycol) diacrylate BASF (Original Cognis) Dipentaerythritol hydroxy BASF (Original Cognis) pentaacrylate Bisphenol A epoxy acrylic resin BASF (Original Cognis) Dioctyl adipate Yuanli Chemical Vinyl trimethoxy silane Nanjing Capatue Chemical Alkoxylated bisphenol A BASF (Original Cognis) dimethacrylate containing 2-20 repeating units of epoxy and propoxy Poly(ethylene glycol) diacrylate BASF (Original Cognis) containing 2-20 repeating units of ethoxy Dipentaerythritol hydroxy BASF (Original Cognis) pentaacrylate Glycerylated bisphenol A BASF (Original Cognis) dimethacrylate, and bisphenol A glycerylated (1-glycerol/phenol) dimethacrylate Poly(ethylene glycol) diacrylate BASF (Original Cognis) containing 2-20 repeating units of propoxy Pentaerythritol triacrylate BASF (Original Cognis) Dipentaerythritol hexaacrylate BASF (Original Cognis)

[0055] The substrate is made of a transparent polymer material for optics with a refractive index of 1.50-1.74, which is any one of polycarbonate, polymethylmethacrylate or polymer alloy, and is commercially available.

Embodiment 1

[0056] A photochromic lens with a bifocal film layer, as shown in FIG. 2, includes a substrate 1, a treatment layer 2 and a photochromic layer 3 from inside to outside. The photochromic layer 3 is cured on a surface of the treatment layer 2 by means of ultraviolet irradiation. The photochromic layer 3 includes the following components in mass fraction: 30% of propoxylated bisphenol A dimethacrylate containing 2-20 repeating units of propoxy, 60% of poly(ethylene glycol) diacrylate containing 2-20 repeating units of propoxy, 10% pentaerythritol tetraacrylate, and the rest of photoinitiator, with a total of 100%. The material of the treatment layer includes the following components in parts by weight: 50 parts of bisphenol A epoxy acrylic resin, 5 parts of dioctyl adipate, 2 parts of vinyl trimethoxy silane, and 1 part of tetrabutylammonium chloride. As shown in FIG. 3, the substrate 1 is an E-line bifocal lens, including a main lens 11, and a segment lens 12. The main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part.

[0057] A preparation method for the photochromic lens with a bifocal film layer provided by the present disclosure specifically includes the following operation steps:

[0058] S1. A treatment layer 2 is uniformly spin-coated on a surface of a substrate 1.

[0059] S2. The substrate 1 obtained in Step S1 is placed in an external mold adapted to a shape and structure of the substrate 1, a gap is reserved between the external mold and the substrate 1 and the external mold and the substrate 1 are fixed with an adhesive tape.

[0060] S3. A photochromic material is injected into the gap of Step S2 to fill and seal the gap.

[0061] S4. The photochromic material is cured by means of ultraviolet irradiation to form a photochromic layer 3.

[0062] S5: Demolding is conducted to obtain the photochromic material with a bifocal film layer.

Embodiment 2

[0063] A photochromic lens with a bifocal film layer, as shown in FIG. 2, includes a substrate 1, a treatment layer 2 and a photochromic layer 3 from inside to outside. The photochromic layer 3 is cured on a surface of the treatment layer 2 by means of ultraviolet irradiation. The photochromic layer 3 includes the following components in mass fraction: 40% of ethoxylated bisphenol A dimethacrylate containing 2-20 repeating units of ethoxy, 45% of poly(ethylene glycol) diacrylate, 15% of dipentaerythritol hydroxyl pentaacrylate, and the rest of photoinitiator, with a total of 100%. The material of the treatment layer includes the following components in parts by weight: 60 parts of bisphenol A epoxy acrylic resin, 6 parts of dioctyl adipate, 4 parts of vinyl trimethoxy silane, and 2 parts of tetrabutylammonium chloride. As shown in FIG. 4, the substrate 1 is a flat-top bifocal lens, including a main lens 11, and a segment lens 12. The main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part.

[0064] A preparation method for the photochromic lens with a bifocal film layer, as shown in FIG. 1, specifically includes the following operation steps:

[0065] S1. A treatment layer is uniformly spin-coated on the surface of a substrate.

[0066] S2. The substrate obtained in Step S1 is placed in the external mold adapted to the shape and structure of the substrate, a gap, which is preferably 4 mm, is reserved between the external mold and the substrate, where the gap is a thickness of the photochromic layer, and the external and the substrate are fixed with an adhesive tape.

[0067] S3. An injection hole is punched in the adhesive tape, a photochromic material is injected into the gap through the injection hole with a syringe, and then the hole is sealed with the adhesive tape.

[0068] S4. The photochromic material is cured by means of ultraviolet irradiation to form the photochromic layer 3.

[0069] S5. Demolding is conducted to obtain the photochromic material with a bifocal film layer.

[0070] The substrate 1 includes a main lens 11 and a segment lens 12, the main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part. The segment lens 11 is a prism structure with an inward substrate, and the external mold is a bifocal glass mold.

Embodiment 3

[0071] A photochromic lens with a bifocal film layer, as shown in FIG. 2, includes a substrate 1, a treatment layer 2 and a photochromic layer 3 from inside to outside. The photochromic layer 3 is cured on a surface of the treatment layer 2 by means of ultraviolet irradiation. The photochromic layer 3 includes the following components in mass fraction: 55% of alkoxylated bisphenol A dimethacrylate containing 2-20 repeating units of epoxy and propoxy, 35% of poly(ethylene glycol) diacrylate containing 2-20 repeating units of ethoxy, 10% of dipentaerythritol hydroxyl pentaacrylate, and the rest of photoinitiator, with a total of 100%. The material of the treatment layer includes the following components in parts by weight: 75 parts of bisphenol A epoxy acrylic resin, 7 parts of dioctyl adipate, 4 parts of vinyl trimethoxy silane, and 2 parts of tetrabutylammonium chloride. The substrate 1 is a flat-top bifocal lens, including a main lens 11, and a segment lens 12. The main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part.

[0072] A preparation method for the photochromic lens with a bifocal film layer, as shown in FIG. 1, specifically includes the following operation steps:

[0073] S1. A treatment layer is uniformly spin-coated on the surface of a substrate.

[0074] S2. The substrate obtained in Step S1 is placed in the external mold adapted to the shape and structure of the substrate, a gap, which is preferably 5 mm, is reserved between the external mold and the substrate, where the gap is a thickness of the photochromic layer, and the external and the substrate are fixed with an adhesive tape.

[0075] S3. A photochromic material is injected into the gap of Step S2, when the photochromic material is filled to ? to ? of the volume of the gap, the gap is adjusted to 4 mm, the photochromic material is continuously injected until the gas is filled and sealed with the photochromic material.

[0076] S4. The photochromic material is cured by means of ultraviolet irradiation to form the photochromic layer 3.

[0077] S5. Demolding is conducted to obtain the photochromic material with a bifocal film layer.

Embodiment 4

[0078] A photochromic lens with a bifocal film layer, as shown in FIG. 2, includes a substrate 1, a treatment layer 2 and a photochromic layer 3 from inside to outside. The photochromic layer 3 is cured on a surface of the treatment layer 2 by means of ultraviolet irradiation. The photochromic layer 3 includes the following components in mass fraction: 50% of glycerylated bisphenol A dimethacrylate and bisphenol A glycerylated (1-glycerol/phenol) dimethacrylate, 20% of poly(ethylene glycol) diacrylate containing 2-20 repeating units of propoxy, 30% of pentaerythritol triacrylate, and the rest of photoinitiator, with a total of 100%. The material of the treatment layer includes the following components in parts by weight: 65 parts of bisphenol A epoxy acrylic resin, 5 parts of dioctyl adipate, 5 parts of vinyl trimethoxy silane, and 1 part of tetrabutylammonium chloride. As shown in FIG. 4, the substrate 1 is a flat-top bifocal lens, including a main lens 11, and a segment lens 12. The main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part.

[0079] A preparation method for the photochromic lens with a bifocal film layer, as shown in FIG. 1, specifically includes the following operation steps:

[0080] S1. A treatment layer is uniformly spin-coated on the surface of a substrate.

[0081] S2. The substrate obtained in Step S1 is placed in the external mold adapted to the shape and structure of the substrate, a gap, which is preferably 5 mm, is reserved between the external mold and the substrate, where the gap is a thickness of the photochromic layer, and the external and the substrate are fixed with an adhesive tape.

[0082] S3. An injection hole and a vent hole are punched in the adhesive tape, and the vent hole is adjacent to the injection hole. When the photochromic material overflows from the vent hole, it can be determined that the gap has been filled with the photochromic material. The photochromic material is injected into the gap through the injection with the syringe, and then the hole is sealed with the adhesive tape. The photochromic material is injected into the gap of S2, when the photochromic material is filled to ? to ? of the volume of the gap, the gap is adjusted to 4 mm, the photochromic material is continuously injected until the gas is filled and sealed with the photochromic material.

[0083] S4. The photochromic material is cured by means of ultraviolet irradiation to form the photochromic layer 3.

[0084] S5. Demolding is conducted to obtain the photochromic material with a bifocal film layer.

[0085] The substrate 1 includes a main lens 11 and a segment lens 12, the main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part. The segment lens 11 is a prism structure with an inward substrate, and the external mold is a bifocal glass mold.

Embodiment 5

[0086] A photochromic lens with a bifocal film layer, as shown in FIG. 2, includes a substrate 1, a treatment layer 2 and a photochromic layer 3 from inside to outside. The photochromic layer 3 is cured on a surface of the treatment layer 2 by means of ultraviolet irradiation. The photochromic layer 3 includes the following components in mass fraction: 45% of ethoxylated bisphenol A dimethacrylate containing 2-20 repeating units of ethoxy, 40% of poly(ethylene glycol) diacrylate containing 2-20 repeating units of ethoxy, 15% of dipentaerythritol hexaacrylate, and the rest of photoinitiator, with a total of 100%. The material of the treatment layer includes the following components in parts by weight: 55 parts of bisphenol A epoxy acrylic resin, 5 parts of dioctyl adipate, 4 parts of vinyl trimethoxy silane, and 2 parts of tetrabutylammonium chloride. The substrate 1 is a flat-top bifocal lens, including a main lens 11, and a segment lens 12. The main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part.

[0087] A preparation method for the photochromic lens with a bifocal film layer, as shown in FIG. 1, specifically includes the following operation steps:

[0088] S1. A treatment layer is uniformly spin-coated on a surface of a substrate 1 and then is subjected to ultraviolet irradiation for 1 min.

[0089] S2. The substrate obtained in Step S1 is placed in the external mold adapted to the shape and structure of the substrate, a gap, which is preferably 5 mm, is reserved between the external mold and the substrate, where the gap is a thickness of the photochromic layer, and the external and the substrate are fixed with an adhesive tape.

[0090] S3. An injection hole and a vent hole are punched in the adhesive tape, and the vent hole is adjacent to the injection hole. When the photochromic material overflows from the vent hole, it can be determined that the gap has been filled with the photochromic material. The photochromic material is injected into the gap through the injection with the syringe, and then the hole is sealed with the adhesive tape. The photochromic material is injected into the gap of S2, when the photochromic material is filled to ? to ? of the volume of the gap, the gap is adjusted to 4 mm, the photochromic material is continuously injected until the gas is filled and sealed with the photochromic material.

[0091] S4. The photochromic material is cured by means of ultraviolet irradiation to form the photochromic layer 3.

[0092] S5. Demolding is conducted to obtain the photochromic material with a bifocal film layer.

[0093] The substrate 1 includes a main lens 11 and a segment lens 12, the main lens 11 is a distance-viewing structure, and the segment lens 12 is a near-viewing part. The segment lens 11 is a prism structure with an inward substrate, and the external mold is a bifocal glass mold.

Comparative Embodiment

[0094] A photochromic lens with a bifocal film layer includes a substrate, a treatment layer and a photochromic layer from inside to outside. The photochromic layer includes the following components in mass fraction: 56% of ethoxylated bisphenol A dimethacrylate containing 2-20 repeating units of ethoxy, 32% of poly(ethylene glycol) diacrylate containing 2-20 repeating units of ethoxy, 12% of dipentaerythritol hydroxy pentaacrylate, and the rest of photoinitiator, with a total of 100%. The substrate is a flat-top bifocal lens.

[0095] A preparation method for the flat-top bifocal lens is that a photochromic layer is uniformly coated on the substrate by means of a spin-coating method and then is cured.

[0096] The photochromatic spectrum analysis (fading transmittance detection) of the lenses of Embodiment 1 and Comparative Embodiment is conduced, and the results are shown in Table 1 and FIG. 5. BYK transmission haze meter is used as the detection instrument, and the environmental condition is 23? C.

TABLE-US-00002 TABLE 1 Photochromic time transmittance of Embodiment 1 and Comparative Embodiment Detailed parameters of detection sample Photochromic time transmittance/% 1 2 3 4 5 15 90 S at the minute minutes minutes minutes minutes minutes Serial Sample Before deepest after after after after after after number name photochromism photochromism fading fading fading fading fading fading 1 Comparative 96.8 18.5 36.2 41.5 68.3 74.7 78.7 85.8 Embodiment 1 2 Embodiment 1 95.7 10.5 37.6 48.3 78.7 85.6 87.5 92.6

[0097] As can be seen from the above table, the photochromism speed of the lens with a bifocal film obtained by the preparation method for the photochromic lens with a bifocal film layer provided by the present disclosure is faster.

[0098] The photochromatic spectrum analysis (fading transmittance detection) of the lenses at two points which are respectively the center and 25 mm away from the center in Embodiment 1 and Comparative Embodiment is conducted, and the results are shown in Table 2. BYK transmission haze meter is used as the detection instrument, and the environmental condition is 20? C.

TABLE-US-00003 TABLE 2 Photochromatic spectrum analysis results of lenses at the center and 25 mm away from the center in Embodiment 1 and Comparative Embodiment Lens Center 25 mm away from the center Transmittance of lens after ultraviolet irradiation for 90 S Comparative 23 19 Embodiment 1 Embodiment 1 18 18 Transmittance of lens after fading for 5 min Lens Center 25 mm away from the center Comparative 78 74 Embodiment 1 Embodiment 1 83 83

TABLE-US-00004 TABLE 3 Anti-ageing cracking experimental results Setting Select the same substrate lens, add photochromic layer directly condition without treatment layer, and add photochromic layer after treatment layer, and then conduct ageing tolerance test Ageing Humidity 70% Temperature 80? C. Total 48 h Observe environment time one time per hour Result Without After standing for one hour under ageing conditions, treatment the lens cracked, and the substrate was separated from layer the photochromic layer. With After standing for 48 hours under the same conditions, treatment no cracking and delamination occurred. layer Conclusion It can be seen that the substrate and the photochromic layer do not have good adhesion, but after the treatment layer is applied, the adhesion effect between the substrate and the photochromic layer is greatly increased, and the service life is prolonged.

[0099] As can be seen from the above tables, the photochromism of the lens with a bifocal film layer obtained by the preparation method for the photochromic lens with the bifocal film layer is more uniform, and the transmittance of the lens at the center point is basically the same as that of the lens 25 mm away from the center, thus ensuring the uniformity of the photochromic film, and the color changes quickly and uniformly in the near light area, while in the Comparative embodiment, the transmittance of the lens at the center point has a certain difference from that of the lens 25 mm away from the center.

[0100] The above is only the preferred embodiment of the present disclosure, rather than limiting the present disclosure in any form. Although the present disclosure has been shown in the preferred embodiment, it is not used to limit the present disclosure. A person skilled in the art may use the technical disclosure disclosed in the above to make any variations, or modify the equivalent changes in to equivalent embodiments. Any simple variations, equivalent changes, or modifications made to the foregoing embodiments according to the technical essence a the present disclosure without departing from contents of the technical solutions of the present disclosure shall all fall within the scope of the technical solutions of the present disclosure.