Water-resistant polarized resin lens and processing technology thereof

Abstract

The invention discloses a water-resistant polarized resin lens which comprises a resin substrate, a hydrophobic film with a lotus leaf-like micro-nano structure is formed on the surface of the resin substrate through a plasma deposition technology, a polarized film is clamped in the middle of the inner layer of the resin substrate, and the polarized film is covered with a layer of self-repairing elastic resin structure. A lotus leaf-like micro-nano hierarchical structure is efficiently constructed on the surface of the resin lens through a plasma deposition technology and a three-step method of mask assistance, gas phase self-assembly and low-temperature fluorination on the surface of the resin substrate, the water contact angle is larger than 150 degrees, water drops cannot adhere to the structure, and the water resistance of the structure is improved; meanwhile, the polarizing film is embedded into the middle layer of the resin base material and covered with a layer of self-repairing elastic resin, so that delamination of the polarizing film caused by water vapor permeation is prevented, and the service life of the polarizing film is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of lenses, and specifically relates to a water-resistant polarizing resin lens and its processing technology. Background Art

[0002] Existing polarizing glasses lenses are basically divided into multi-layer laminating types using triacetate as the base material and injection molding or pouring types using high molecular resin.

[0003] Since the multi-layer laminating type polarizing glasses lenses using triacetate as the base material have an affordable price and are widely used in the market. However, because they use water-based glue to bond with the polarizing base film, and triacetate has strong water absorption and water permeability, it is very easy to absorb moisture in a high humidity environment, causing water molecules to penetrate triacetate and react with the water-based glue, resulting in a poor adhesion of the water-based glue, and then the problem of material delamination occurs. That is, the polarizing film will be peeled off from the resin substrate, and many "white spots" inside the lens can be easily observed by the naked eye, which is an intolerable fatal defect for the lens, leading to a reduced service life. In addition, the water resistance on the lens surface and the performance of its surface film layer will also be further affected.

[0004] Therefore, further improvement in water resistance and durability of the polarizing film for polarizing resin lenses is needed. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a water-resistant polarizing resin lens to avoid the trouble of poor water resistance on the surface of conventional polarizing resin lenses and easy delamination of the inner polarizing film.

[0006] To solve the above technical problem, the present invention discloses a water-resistant polarizing resin lens, which includes: A resin substrate, on the surface of which a hydrophobic film with a lotus leaf-like micro-nano structure is formed by plasma deposition technology. A polarizing film is sandwiched in the middle of the inner layer of the resin substrate, and a self-healing elastic resin structure is covered on the polarizing film.

[0007] The present invention also discloses a processing technology for a water-resistant polarizing resin lens, including: Step a. Pretreatment of the polarizing film: Provide a polarizing film made of PVA. Under an Ar / O2 atmosphere, treat the surface of the polarizing film at a power of 100W for 1 minute to increase -OH groups for plasma activation and improve the resin adhesion; then spray an ethanol solution containing a silane coupling agent and dry it at 80°C for 2 minutes to form a chemical bonding transition layer for primer treatment; Step b. Self-healing resin coating: The self-healing resin consists of, by mass percentage, 60% - 70% polyurethane acrylate, 10% - 15% disulfide crosslinking agent, 5% - 8% silicone microcapsules, 1% - 2% photoinitiator, and 0.5% - 1% nano-silica. The self-healing resin is extruded by a slot coater at a speed of 0.5 m / min with an accuracy of ±2 μm to form a uniform coating with a thickness of 20 - 30 μm on both the upper and lower surfaces of the polarizing film. Step c. UV pre-curing: Use UV light with a main wavelength of 365 nm and an intensity of 50 mW / cm² to irradiate for 10 seconds to preliminarily crosslink the resin surface layer with a curing degree of 60% - 70% to avoid flow deformation. Step d. Thermal pressing and fixing: Thermally press the polarizing film with the pre-cured resin and the lens substrate at 80°C and 0.5 MPa for 60 seconds to expel air bubbles and enhance the interfacial bonding. Step e. Secondary UV curing: Irradiate with a wavelength band of 395 nm and an intensity of 100 mW / cm² for 30 seconds to achieve complete crosslinking; laser cut the excess resin layer, and perform surface plasma cleaning after ensuring the lens contour accuracy. Step f. Micron-scale papilla construction: Spin-coat polystyrene microspheres with a particle size of 1 - 5 μm on the cleaned resin substrate, and introduce SiH4 / O2 as a mask to deposit a SiO2 layer with a thickness of 500 nm. Ultrasonically remove the microspheres to leave honeycomb-shaped micron-sized pits, thereby reversely simulating the lotus leaf papilla; use the plasma direct deposition process, adjust the plasma to the pulse mode with a duty cycle of 30% to enable the discontinuous growth of silica to form island-shaped micron-sized protrusions. Step g. Nanoscale villi growth: Introduce SiH4 / NH3 to generate SiNx nanowires with a diameter of ~100 nm, and guide the vertical growth of the nanowires through the substrate bias voltage to form a villous structure. Then, sputter 5 - 10 nm gold nanoparticles on the silica layer as a catalyst to induce the growth of carbon nanotubes to achieve nanoparticle embedding. Step h. Fluorocarbon layer deposition: Introduce C4F8 gas to deposit a 20 - 50 nm thick PTFE-like fluorocarbon layer on the micro-nano structure surface to finally form a hydrophobic film with a lotus leaf-like micro-nano structure.

[0008] According to an embodiment of the present invention, in step b above, the viscosity control of the slot coater is 300 - 500 cP, and the temperature is 25°C.

[0009] According to an embodiment of the present invention, in steps f and g above, the spacing of the micron-scale papillae is targeted at 10 - 20 μm; the density of the nanoscale villi is >100 roots / μm².

[0010] According to an embodiment of the present invention, in step h above, the power is 80 W, the air pressure is 30 Pa, and the time is 10 minutes.

[0011] Compared with the prior art, the present invention can achieve the following technical effects: By forming a lotus-leaf-like micro-nano structure coating on the surface of the resin substrate through plasma deposition technology, the water contact angle > 150°, water droplets cannot adhere, improving its water resistance; at the same time, the polarizing film is embedded in the middle layer of the resin substrate and covered with a self-healing elastic resin to prevent delamination of the polarizing film caused by water vapor penetration and improve its service life.

[0012] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned technical effects simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a schematic diagram of a water-resistant polarizing resin lens according to an embodiment of the present invention. REFERENCE SIGNS

[0014] Resin substrate 10, polarizing film 20, hydrophobic film 30. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will be described in detail in conjunction with the drawings and embodiments of the present invention, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0016] Please refer to Figure 1 , Figure 1 It is a schematic diagram of a water-resistant polarizing resin lens according to an embodiment of the present invention.

[0017] As shown in the figure, a water-resistant polarizing resin lens includes a resin substrate 10, a hydrophobic film 30 with a lotus-leaf-like micro-nano structure is formed on the surface of the resin substrate 10 through plasma deposition technology, a polarizing film 20 is sandwiched in the middle layer of the resin substrate 10, and a self-healing elastic resin structure is covered on the polarizing film 20.

[0018] In an embodiment of the present invention, the resin substrate 10 is formed by curing resin. A polarizing film 20 made of PVA is sandwiched in the middle layer to provide the polarizing effect of the lens. At the same time, the polarizing film 20 is preset with a self-healing elastic resin structure to prevent delamination of the polarizing film 20 caused by water vapor penetration. The outer surface of the resin substrate 10 is formed with a hydrophobic film 30 with a lotus leaf-like micro-nano structure through plasma deposition technology, imitating the papillae on the surface of the lotus leaf, so that the water contact angle > 150°, and water droplets cannot adhere, thus avoiding the problem of water droplet residue and water vapor erosion. The plasma deposition technology can adopt PECVD (plasma enhanced chemical vapor deposition): suitable for low-temperature deposition (<100 °C) to avoid deformation of the resin lens. Or ICP-PECVD (inductively coupled plasma): higher-density plasma and more uniform structure.

[0019] The present invention also discloses a processing technology for a water-resistant polarizing resin lens, including: Step a. Pretreatment of the polarizing film: Provide a polarizing film made of PVA. Under an Ar / O2 atmosphere with a ratio of 3:1 and a power of 100 W, treat the surface of the polarizing film for 1 minute to increase -OH groups for plasma activation and improve resin adhesion; then spray an ethanol solution containing a silane coupling agent, such as an ethanol solution of KH-550, with a concentration of 1%, and dry it at 80 °C for 2 minutes to form a chemical bonding transition layer and complete the primer treatment. Step b. Coating of the self-healing resin: The self-healing resin includes, by mass percentage, 60% - 70% of polyurethane acrylate, 10% - 15% of disulfide cross-linking agent, 5% - 8% of silicone microcapsules, 1% - 2% of photoinitiator, and 0.5% - 1% of nano-silica; among them, the polyurethane acrylate (PUA) matrix resin provides elasticity and UV curing characteristics; the disulfide cross-linking agent (DTE) is a dynamic covalent bond to achieve self-healing at room temperature (recombination after fracture); the silicone microcapsules contain repair monomers (such as PDMS) and are released during deep scratches; the photoinitiator (TPO) triggers UV curing; nano-SiO2 enhances mechanical strength and reduces light transmittance loss. The self-healing resin is extruded by a slot coater at a speed of 0.5 m / min with an accuracy of ±2 μm to form a uniform coating with a thickness of 20 - 30 μm on both the upper and lower surfaces of the polarizing film; viscosity control: 300 - 500 cP (25 °C), and the temperature cannot exceed 40 °C to prevent premature rupture of the microcapsules.

[0020] Step c. UV pre-curing: Use UV light with a main wavelength of 365 nm and an intensity of 50 mW / cm² to irradiate for 10 seconds to preliminarily cross-link the resin surface with a curing degree of 60% - 70% to avoid flow deformation.

[0021] Step d. Hot pressing and fixing: Hot press the polarizing film with the pre-cured resin and the lens substrate at 80 °C and 0.5 MPa for 60 seconds to discharge air bubbles and enhance the interfacial bonding; the deviation of the polarization axis < 0.5°, and align through CCD vision.

[0022] Step e. Secondary UV curing: Irradiate for 30 seconds with a wavelength band of 395 nm and an intensity of 100 mW / cm² to achieve complete cross-linking; then trim the edges, laser cut the excess resin layer to ensure the lens profile accuracy with a tolerance of ±0.1 mm, and then perform surface plasma cleaning.

[0023] Verification of the self-healing performance of the polarizing film 20 Scratch repair: Scratch with a steel wool (#0000 grade) applying a force of 5 N, and observe at 25 °C. The scratches disappear within 2 hours.

[0024] Light transmittance recovery: Measure the light transmittance at 550 nm before and after repair with a spectrophotometer, and the loss < 1%.

[0025] Water vapor barrier: Place in an environment of 85 °C / 85% RH for 240 hours, and detect delamination of the polarizing film. There is no delamination and no fogging. Wear resistance: Taber test (CS-10 wheel, 500 g load, 1000 times), and the contact angle remains > 140°. Thus, it can be obtained that the polarizing film with a self-healing elastic resin structure is applied to the resin substrate, with good durability, light transmittance, water vapor barrier, and no delamination of the polarizing film.

[0026] Next, continue with the hydrophobic film design for the surface of the resin substrate. Perform substrate plasma cleaning, introduce a mixed gas of Ar / O2 (ratio 4:1), with a power of 150 W, and process for 5 minutes. Remove surface organic substances, generate active -OH groups, and enhance adhesion.

[0027] Step f. Construction of micron-scale papillae: Spin-coat polystyrene microspheres with a particle size of 1 - 5 μm on the cleaned resin substrate as a mask, introduce SiH4 / O2, deposit a SiO2 layer with a thickness of 500 nm, ultrasonically remove the microspheres, leaving honeycomb-shaped micron-sized pits, and reverse simulate the lotus leaf papillae in this way; adopt a plasma direct deposition process, adjust the plasma to a pulse mode with a duty cycle of 30% to make the silicon dioxide grow discontinuously and form island-shaped micron-sized protrusions; Step g. Growth of nano-scale villi: Introduce SiH4 / NH3 to generate SiNx nanowires with a diameter of ~100 nm, guide the vertical growth of the nanowires through substrate biasing to form a villous structure, and then sputter 5 - 10 nm gold nanoparticles on the silicon dioxide layer as a catalyst to induce the growth of carbon nanotubes to achieve nanoparticle embedding; Step h. Deposition of fluorocarbon layer: Introduce C4F8 gas to deposit a PTFE-like fluorocarbon layer with a thickness of 20 - 50 nm on the surface of the micro-nano structure, with a surface energy < 15 mN / m, finally forming a hydrophobic film with a lotus-leaf-like micro-nano structure.

[0028] Preferably, in steps f and g, the spacing of the micro-papillae is targeted at 10 - 20 μm; the density of the nano-villi > 100 roots / μm². In step h, the power is 80 W, the air pressure is 30 Pa, and the time is 10 minutes. Further, gradient energy deposition is adopted: by adjusting the radio frequency power, which changes in a gradient from 50 W to 200 W, to make the bottom of the micro-structure dense and the top loose, enhancing the mechanical strength.

[0029] Verification of hydrophobicity: Contact angle tester: It is required that the water contact angle > 150° and the rolling angle < 5°.

[0030] Durability test: Taber abrasion tester (CS-10 wheel, 500 g load, CA > 140° after 5000 cycles).

[0031] This hydrophobic film adopts the plasma deposition process, with the structural precision controlled synchronously and precisely at the micron / nano level, forming a film directly at low temperature, suitable for resin substrates. The single-piece processing time < 1 hour. It has a vacuum closed-loop and no waste water or waste gas. The plasma deposition technology constructs a micro-nano hierarchical structure similar to that of a lotus leaf on the surface of resin lenses through a three-step method of mask-assisted + gas-phase self-assembly + low-temperature fluorination. Combining photocatalytic TiO2 doping and gradient energy design, the finally coated film has both superhydrophobicity (CA > 160°), high abrasion resistance (5000 wipes), and self-cleaning properties, perfectly meeting the requirements of sports optical lenses.

[0032] The above description shows and describes several preferred embodiments of the present invention. However, as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A water-resistant polarized resin lens, characterized in that: include: A resin substrate, a hydrophobic film with a lotus leaf-like micro-nano structure is formed on the surface of the resin substrate by plasma deposition technology, a polarizing film is sandwiched in the middle of the inner layer of the resin substrate, and the polarizing film is covered with a layer of self-repairing elastic resin structure.

2. A process for processing a water-resistant polarized resin lens as claimed in claim 1, characterized in that: include: Step a. Pretreatment of the polarizing film: provide a polarizing film made of PVA material, treat the surface of the polarizing film with 100W power for 1 minute in an Ar / O2 atmosphere to increase -OH groups for plasma activation and improve the adhesion of the resin; then spray an ethanol solution containing a silane coupling agent, dry it at 80°C for 2 minutes to form a chemically bonded transition layer, and perform primer treatment; Step b. coating a self-healing resin, wherein the self-healing resin comprises, by mass percentage, 60% to 70% of polyurethane acrylate, 10% to 15% of a disulfide crosslinking agent, 5% to 8% of siloxane microcapsules, 1% to 2% of a photoinitiator, and 0.5% to 1% of nano-silica; the self-healing resin is extruded by a slit coater at a speed of 0.5 m / min and an accuracy of ±2 μm, forming a uniform coating of 20 to 30 μm thick on the upper and lower surfaces of the polarizing film; Step c. UV pre-curing, using UV light with a main wavelength of 365nm and an intensity of 50mW / cm² for 10 seconds to make the surface of the resin initially cross-linked, with a curing degree of 60%~70%, to avoid flow deformation; Step d. hot pressing and fixing, hot pressing the polarizing film of the pre-cured resin and the lens substrate at 80°C and 0.5MPa for 60 seconds to remove bubbles and enhance interface bonding; Step e. Secondary UV curing, with a wavelength of 395nm and an intensity of 100mW / cm² for 30 seconds to achieve complete cross-linking; laser cutting of the excess resin layer to ensure the accuracy of the lens contour and then plasma cleaning of the surface; Step f. Construction of micron-scale papillae: spin-coat the cleaned resin substrate with polystyrene microspheres with a particle size of 1 to 5 μm, pass SiH4 / O2 as a mask, deposit a SiO2 layer with a thickness of 500 nm, remove the microspheres with ultrasound, and leave honeycomb-shaped micron pits, thereby reversely simulating lotus leaf papillae; adopt a plasma direct deposition process, adjust the plasma to a pulse mode with a duty cycle of 30%, so that silicon dioxide grows discontinuously to form island-shaped micron protrusions; Step g. Nanoscale villi growth, SiH4 / NH3 is introduced to generate SiNx nanowires with a diameter of ~100nm, and the nanowires are guided to grow vertically by substrate bias to form a villi-like structure, and then 5~10nm gold nanoparticles are sputtered on the silicon dioxide layer as a catalyst to induce the growth of carbon nanotubes, thereby achieving nanoparticle embedding; Step h. Fluorocarbon layer deposition: C4F8 gas is introduced to deposit a 20-50 nm thick PTFE-like fluorocarbon layer on the surface of the micro-nano structure, and finally a hydrophobic film imitating the lotus leaf micro-nano structure is formed.

3. The processing technology of the water-resistant polarized resin lens according to claim 2, characterized in that: In step b, the viscosity of the slit coater is controlled at 300-500 cP and the temperature is 25°C.

4. The processing technology of the water-resistant polarized resin lens according to claim 2, characterized in that: The target distance between micron papillae in step f and step g is 10-20 μm; the density of nano villi is >100 / μm².

5. The processing technology of the water-resistant polarized resin lens according to claim 2, characterized in that: In the step h, the power is 80W, the air pressure is 30Pa, and the time is 10 minutes.

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