Film coating processing method for glasses frame with waterproof and sunscreen capabilities

Abstract

The invention relates to the technical field of mirror frame processing, and discloses a mirror frame coating processing method with waterproof and sunscreen capabilities, which comprises the following steps: S1, cleaning and plasma treatment are carried out on a mirror frame base material; s2, coating a silicon dioxide bottom film by adopting a magnetron sputtering method; s3, coating a waterproof and sunscreen composite film formed by mixing nano titanium dioxide and an organic silicon waterproof agent by adopting a spraying method; s4, coating a silicon dioxide-aluminum oxide composite protective layer by adopting a sol-gel method; and S5, carrying out natural aging treatment on the coated mirror frame. By adopting the plasma pretreatment and multi-layer coating film structure design, the bonding force of the coating film and the mirror frame base material is remarkably improved, the problem of coating film stripping is effectively solved, and the mirror frame has excellent waterproof and sunscreen performance through the synergistic effect of the nano titanium dioxide and the organic silicon waterproof agent.

Description

Technical Field

[0001] This invention relates to the field of eyeglass frame processing technology, specifically to a method for coating eyeglass frames with waterproof and sun-proof capabilities. Background Technology

[0002] In a context where modern fashion and practicality are both essential, eyeglass frames serve as important wearable accessories and vision correction tools, widely used in various scenarios such as daily life, outdoor sports, and specialized work. Whether commuting daily, vacationing at the beach, or engaging in outdoor activities like hiking or cycling, eyeglass frames must withstand the test of different environments, with waterproofing and sun protection being key performance indicators. For example, in humid environments such as swimming or rainy days, if the waterproof performance of the frame is inadequate, moisture can easily enter the gap between the lens and the frame, affecting visual clarity and even causing internal components to rust and become damaged. Under strong sunlight outdoors, ultraviolet rays not only accelerate the aging and fading of the frame material but may also cause damage to the eyes through refraction at the edges of the frame.

[0003] Currently, existing eyeglass frame coating processes have significant shortcomings. On the one hand, traditional coating processes typically focus solely on either waterproofing or sun protection, failing to achieve effective synergistic improvement in both functions. Furthermore, the adhesion between the coating and the frame substrate is weak, leading to coating peeling after prolonged use. On the other hand, some processes use coating materials with poor environmental friendliness, containing volatile harmful substances that can adversely affect the health of operators and the environment during processing. Simultaneously, existing processes lack precision in controlling coating thickness and uniformity, resulting in significant differences in waterproofing and sun protection performance across different parts of the frame, failing to meet the requirements of high-quality products.

[0004] Therefore, developing a new coating process that can simultaneously and significantly improve the waterproof and sun protection capabilities of eyeglass frames, enhance coating adhesion, and improve environmental friendliness and process precision is an urgent practical need and has important application value. Summary of the Invention

[0005] The purpose of this invention is to provide a method for coating eyeglass frames with waterproof and sun-proof capabilities in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for applying a waterproof and sun-protective coating to eyeglass frames, comprising the following steps:

[0008] S1: Clean the lens frame substrate (such as metal, plastic, or composite material) to be coated. First, ultrasonically clean it with deionized water for 10-15 minutes to remove surface oil and dust, then wipe it dry with anhydrous ethanol. Then, perform plasma treatment. In an environment with a vacuum degree of 10-20 Pa, treat with argon plasma with a power of 80-120W for 5-8 minutes to activate the lens frame surface and improve the adhesion of the coating.

[0009] S2: A silica base film is coated using magnetron sputtering with a sputtering power of 150-200W and a sputtering time of 15-20 minutes, controlling the base film thickness to be 50-80nm. Silica has good chemical stability and optical transparency, and can be used as a base layer for waterproof and sun-proof coatings, enhancing the adhesion between subsequent coatings and the substrate.

[0010] S3: Mix nano-titanium dioxide (particle size 20-40nm) and silicone waterproofing agent at a mass ratio of 1:(0.5-1.5), and add to a mixed solvent of ethanol and deionized water (volume ratio 1:1) to prepare a coating solution with a solid content of 5%-8%. Apply the coating solution evenly to the surface of the base film using a spraying method. The spraying pressure is 0.3-0.5MPa, and the spraying distance is 15-20cm. Then dry at 80-100℃ for 10-15 minutes to form a waterproof and sun-protective composite film with a thickness of 100-150nm. Nano-titanium dioxide has excellent UV shielding ability, and the silicone waterproofing agent can form a hydrophobic layer on the surface of the frame to achieve waterproofing. The combination of the two can synergistically improve waterproof and sun-protective performance.

[0011] S4: A silica-alumina composite protective layer is coated using the sol-gel method. Tetraethyl orthosilicate, aluminum isopropoxide, and ethanol are mixed in a molar ratio of 1:(0.2-0.5):(5-8). An appropriate amount of hydrochloric acid is added to adjust the pH to 2-3, and the mixture is stirred at room temperature for 2-3 hours to form a sol. The sol is then uniformly coated onto the surface of the waterproof and sun-protective composite film, with a coating thickness controlled at 30-50 nm. Finally, the film is heat-treated at 150-200℃ for 20-30 minutes to form a dense protective layer, further improving the wear resistance and chemical stability of the coating.

[0012] S5: Place the coated frame at room temperature for 24 hours for natural aging to make the coating structure more stable.

[0013] Preferably, the frame substrate is made of metal, plastic, or composite material.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] 1. This invention significantly improves the adhesion between the coating and the frame substrate by adopting plasma pretreatment and multi-layer coating structure design, effectively solving the problem of coating peeling. Furthermore, the synergistic effect of nano titanium dioxide and organosilicon waterproofing agent enables the frame to have excellent waterproof and sun protection properties.

[0016] 2. This invention uses environmentally friendly coating materials and processes, avoiding the use of harmful substances in traditional processes. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1

[0019] Raw material preparation

[0020] Frame material: Titanium alloy frame

[0021] Coating materials: silica target, nano titanium dioxide (30nm particle size), silicone waterproofing agent (Dow Corning DC5771, for performance reference only, not involving manufacturer information), tetraethyl orthosilicate, aluminum isopropoxide, ethanol, hydrochloric acid, deionized water

[0022] Preparation process

[0023] Pretreatment: The titanium alloy frame was ultrasonically cleaned with deionized water for 12 minutes, wiped dry with anhydrous ethanol, and then placed in a plasma treatment device for 6 minutes in an argon plasma with a vacuum of 15 Pa and a power of 100 W.

[0024] Base film coating: Magnetron sputtering was used with a sputtering power of 180W and a sputtering time of 18 minutes to coat a silica base film with a thickness of 65nm.

[0025] Preparation of waterproof and sun-protective composite film: Nano-titanium dioxide and organosilicon waterproofing agent are mixed at a mass ratio of 1:1, and then added to ethanol and deionized water (volume ratio of 1:1) to prepare a coating solution with a solid content of 6.5%. The solution is sprayed at a spraying pressure of 0.4 MPa and a spraying distance of 18 cm, and then dried at 90℃ for 12 minutes to form a composite film with a thickness of 120 nm.

[0026] Protective coating: Tetraethyl orthosilicate, aluminum isopropoxide, and ethanol were mixed in a molar ratio of 1:0.3:6. Hydrochloric acid was added to adjust the pH to 2.5, and the mixture was stirred for 2.5 hours to form a sol. The sol was then coated onto the surface of the composite membrane to a thickness of 40 nm and heat-treated at 180 °C for 25 minutes.

[0027] Post-treatment: Allow to age naturally at room temperature for 24 hours.

[0028] Example 2

[0029] The difference from Example 1 is as follows:

[0030] The mass ratio of nano-titanium dioxide to organosilicon waterproofing agent is 1:0.5, the solid content of the coating liquid is 5%, the spraying pressure is 0.3MPa, the spraying distance is 15cm, the drying temperature is 80℃, and the drying time is 15 minutes.

[0031] When applying the protective layer, the molar ratio of tetraethyl orthosilicate, aluminum isopropoxide, and ethanol is 1:0.2:5, the pH value is 2, the stirring time is 2 hours, the coating thickness is 30 nm, the heat treatment temperature is 150℃, and the heat treatment time is 30 minutes.

[0032] Example 3

[0033] The difference from Example 1 is as follows:

[0034] The mass ratio of nano-titanium dioxide to organosilicon waterproofing agent is 1:1.5, the solid content of the coating liquid is 8%, the spraying pressure is 0.5MPa, the spraying distance is 20cm, the drying temperature is 100℃, and the drying time is 10 minutes.

[0035] When applying the protective layer, the molar ratio of tetraethyl orthosilicate, aluminum isopropoxide, and ethanol is 1:0.5:8, the pH value is 3, the stirring time is 3 hours, the coating thickness is 50 nm, the heat treatment temperature is 200℃, and the heat treatment time is 20 minutes.

[0036] Comparative Example 1

[0037] Except for omitting the plasma treatment in step S1, the other process parameters are the same as in Example 1.

[0038] Comparative Example 2

[0039] The silicone waterproofing agent in step S3 is omitted, and only nano-titanium dioxide is used to prepare the coating solution. The remaining process parameters are the same as in Example 1.

[0040] Comparative Example 3

[0041] Ordinary waterproof and sun-proof coatings are applied using traditional spraying methods, without plasma pretreatment or multi-layer coating. The coatings do not contain synergistic components of nano-titanium dioxide and organosilicon waterproofing agents.

[0042] Performance testing

[0043] Testing equipment and standards

[0044] Adhesion test: Cross-cut test, refer to GB / T9286-1998, use a cross-cut tester to cut 1mm×1mm squares on the coating surface, stick 3M tape on and then peel it off, observe the coating peeling, and rate the grade (0 is the best, 5 is the worst).

[0045] Waterproof performance test: A self-made water flow impact test device was used. The water flow impact speed was 5m / s, and the frame was continuously impacted for 10 minutes. The permeability of the frame gaps was tested (permeability = water seepage / total impact water volume × 100%).

[0046] Sun protection performance test: UV-Vis spectrophotometer (model: UV-2600) was used to test the UV transmittance in the wavelength range of 280-400nm and calculate the UV blocking rate (blocking rate = (1 - transmittance) × 100%).

[0047] Coating thickness uniformity test: Step meter (model: DektakXT) was used to measure the coating thickness at 5 points on different parts of the frame and calculate the thickness uniformity error (error = (maximum thickness - minimum thickness) / average thickness × 100%).

[0048] Test Results

[0049] sample Adhesion rating Crevice permeability UV blocking rate Thickness uniformity error Example 1 Level 0 0.3% 96.5% 4.2% Example 2 Level 1 0.8% 94.0% 5.0% Example 3 Level 0 0.2% 97.0% 3.8% Comparative Example 1 Level 2 1.5% 95.0% 5.5% Comparative Example 2 Level 1 1.2% 92.0% 4.8% Comparative Example 3 Level 3 4.0% 85.0% 12.0%

[0050] Results Analysis

[0051] The comparison between the examples and the comparative examples shows that plasma pretreatment is crucial for improving the adhesion of the coating. Omitting this step (Comparative Example 1) will cause the adhesion level to drop to level 2, and the gap penetration rate and thickness uniformity will also deteriorate.

[0052] The synergistic effect of nano-titanium dioxide and silicone waterproofing agent significantly improved waterproof and sun protection performance. Comparative Example 2, which used only nano-titanium dioxide, had lower UV blocking rate and waterproof performance than the Example 1, indicating that the addition of silicone waterproofing agent effectively enhanced the waterproof function, and the combination of the two had a synergistic effect on UV blocking.

[0053] The traditional coating process (Comparative Example 3) is significantly inferior to the embodiments of the present invention in all performance indicators, which proves the innovation and advancement of the process of the present invention.

[0054] By adjusting the ratio of nano-titanium dioxide to organosilicon waterproofing agent and the process parameters of the protective layer, the waterproof and sun protection performance and coating quality of the frames can be optimized within a certain range in each embodiment. This shows that the process of the present invention has good adjustability and practicality, and can meet the needs of different types of frames and usage scenarios.

[0055] The above description of the embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for coating eyeglass frames with waterproof and sun-proof capabilities, characterized in that, Includes the following steps: S1: Cleaning and plasma treatment of the frame substrate; S2: A silica substrate is coated using magnetron sputtering. S3: A waterproof and sun-protective composite film made of nano-titanium dioxide and organosilicon waterproofing agent is applied by spraying. S4: A silica-alumina composite protective layer is coated using the sol-gel method; S5: Perform natural aging treatment on the coated frame.

2. The method for coating eyeglass frames with waterproof and sun-proof capabilities according to claim 1, characterized in that, The process parameters for plasma treatment are: vacuum degree 10-20 Pa, argon plasma power 80-120 W, and treatment time 5-8 minutes.

3. The method for coating a mirror frame with waterproof and sun-proof capabilities according to claim 1, characterized in that, The process parameters for coating a silica substrate by magnetron sputtering are: sputtering power 150-200W, sputtering time 15-20 minutes, and substrate thickness 50-80nm.

4. The method for coating eyeglass frames with waterproof and sun-proof capabilities according to claim 1, characterized in that, The preparation process parameters of the waterproof and sun-protective composite film are as follows: the mass ratio of nano titanium dioxide (particle size 20-40nm) to organosilicon waterproofing agent is 1:(0.5-1.5), the solid content of the coating solution is 5%-8% (the solvent is a mixture of ethanol and deionized water, volume ratio 1:1), the spraying pressure is 0.3-0.5MPa, the spraying distance is 15-20cm, the drying temperature is 80-100℃, the drying time is 10-15 minutes, and the composite film thickness is 100-150nm.

5. The method for coating eyeglass frames with waterproof and sun-proof capabilities according to claim 1, characterized in that, The preparation process parameters of the silica-alumina composite protective layer are as follows: the molar ratio of tetraethyl orthosilicate, aluminum isopropoxide and ethanol is 1:(0.2-0.5):(5-8), the pH value is adjusted to 2-3 with hydrochloric acid, the stirring time is 2-3 hours to form a sol, the coating thickness is 30-50nm, the heat treatment temperature is 150-200℃, and the heat treatment time is 20-30 minutes.

6. The method for coating eyeglass frames with waterproof and sun-proof capabilities according to claim 1, characterized in that, The natural aging treatment is as follows: place at room temperature for 24 hours.

7. The method for coating eyeglass frames with waterproof and sun-proof capabilities according to claim 1, characterized in that, The frame substrate is made of metal, plastic, or composite material.