A photocatalytic negative oxygen ion near-field purification glasses component and its preparation method

Abstract

This invention discloses a photocatalytic negative oxygen ion near-field purification eyeglass component and its preparation method. The component includes an eyeglass substrate (lens or frame). From the inside out, the outer surface of the substrate is sequentially provided with a functional film layer, a plasma activation layer, and an outermost composite film layer of nitrogen-doped anatase titanium dioxide supported on a Pt-Au-Ag-Pd quaternary noble metal. This film is responsive to the entire visible light band from 400nm to 700nm and stably generates ≥1000 negative oxygen ions / cm³ within a 30cm near-field breathing zone of the wearer's mouth and nose under normal lighting conditions. It also achieves antibacterial and bacteriostatic effects, degradation of harmful gases, surface self-cleaning, and anti-fogging functions. This invention optimizes the film structure, allowing the photocatalyst to directly contact air and visible light, maximizing catalytic efficiency. It is also compatible with lenses and frames, integrating multiple effects such as eye protection, purification, antibacterial properties, and anti-fogging. The process is universal and mass-producible.

Description

Technical Field

[0001] This invention belongs to the interdisciplinary field of eyewear manufacturing and air purification technology, specifically involving a fully visible light responsive photocatalytic negative oxygen ion component based on nitrogen-doped titanium dioxide loaded with quaternary noble metals, which can be used for both eyeglass lenses and frames, and its standardized manufacturing process. Background Technology

[0002] With increasing attention being paid to indoor air pollution in modern living environments, personal protective equipment is gradually becoming an important demand in the consumer market. Eyeglasses, as frequently worn items, offer high stability in both lenses and frames, and are suitable for a wide range of usage scenarios, making them an ideal platform for integrating air purification functions.

[0003] Currently available negative ion glasses products generally suffer from several technical defects: First, the photocatalyst materials used are mostly unmodified titanium dioxide, which can only be excited under ultraviolet light. Under indoor conventional lighting, natural light, and other visible light environments, the catalytic efficiency is extremely low, making it impossible to stably release an effective concentration of negative ions. Second, the release of negative ions is generally low, making it difficult to form an effective purification area around the wearer's mouth and nose. Third, the adhesion between the functional film layer and the substrate is poor, and without surface activation pretreatment, the film layer is prone to peeling and performance degradation. Fourth, the existing technology has an unreasonable film layer arrangement, placing the photocatalyst film layer inside the eye protection functional film layer, preventing it from directly contacting air and visible light, resulting in a significant reduction in catalytic efficiency.

[0004] On April 16, 2026, the applicant filed a Chinese invention patent application entitled "An Integrated Full-Spectrum LED Lamp with Internal and External Double-Sided Photocatalysis and Its Preparation Method Thereof," with application number 202610499257.9, the entire contents of which are incorporated herein by reference. The core technologies of nitrogen-doped titanium dioxide-supported noble metal visible-light-responsive photocatalyst material modification and low-temperature film curing process have been disclosed and verified in detail in that application. This invention creatively extends this mature core technology to the field of eyeglass components, optimizing the film structure and preparation parameters for near-field breathing scenarios, achieving universal compatibility between lenses and frames, and forming a complete technical system for both spatial purification and personal portable purification. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, this invention provides a photocatalytic negative oxygen ion near-field purification glasses component and its preparation method, solving the technical problems of low visible light response efficiency, insufficient negative oxygen ion concentration, poor film adhesion, low purification accuracy, single function, and poor process adaptability in the existing technologies.

[0006] The technical solution adopted in this invention is as follows: a photocatalytic negative oxygen ion near-field purification eyeglass component, comprising an eyeglass substrate, wherein the eyeglass substrate is an eyeglass lens substrate or an eyeglass frame substrate; the outer surface of the eyeglass substrate is subjected to plasma activation treatment, and a functional film layer and a visible light responsive photocatalytic film layer are sequentially provided from the inside to the outside; the photocatalytic film layer can generate negative oxygen ions under natural light or conventional indoor lighting.

[0007] Furthermore, the photocatalyst film is a composite film of nitrogen-doped anatase titanium dioxide supported by Pt-Au-Ag-Pd quaternary noble metals, which can respond to the full visible light band of 400nm to 700nm.

[0008] Furthermore, the quaternary precious metals are co-loaded in equal amounts, with a total load of 0.05 g / m² to 0.20 g / m².

[0009] Furthermore, the thickness of the photocatalytic film layer is 50nm to 200nm, and the light transmittance is not less than 90%.

[0010] Furthermore, the adhesion of the photocatalytic film layer reaches level 0 of the GB / T 9286-1998 standard.

[0011] Furthermore, the spectacle lens substrate includes optical resin, PC, PMMA, optical glass, or borosilicate glass; the spectacle frame substrate includes polymer materials or metal materials.

[0012] Furthermore, the total thickness of all film layers is no more than 300 nm, and the functional film layer is one or more of the following: blue light protection film layer, ultraviolet protection film layer, anti-reflection film layer, or wear-resistant film layer.

[0013] Furthermore, when used alone or in combination, this eyeglass component can stably generate a concentration of no less than 1000 negative oxygen ions / cm³ within a 30cm×30cm×30cm near-field breathing zone around the wearer's mouth and nose, while simultaneously achieving antibacterial and bacteriostatic functions, degradation of harmful gases, surface self-cleaning, and anti-fogging functions.

[0014] Furthermore, no harmful byproducts such as ozone and nitrogen oxides are generated during the operation.

[0015] The present invention also provides a method for preparing the above-mentioned photocatalytic negative oxygen ion near-field purification glasses component, comprising the following steps: (1) Perform ultrasonic cleaning and drying pretreatment on the eyeglass substrate; (2) Vacuum plasma activation treatment is performed on the surface of the pretreated substrate; (3) A functional film layer is composited on the surface of a substrate that has undergone plasma activation treatment; (4) Prepare a mixed dispersion of nitrogen-doped anatase titanium dioxide and Pt-Au-Ag-Pd quaternary noble metals, and uniformly coat it on the outside of the functional film layer; (5) The photocatalyst film layer is obtained by gradient drying at 50-80℃, UV pre-curing and room temperature cross-linking molding.

[0016] Further, in step (2), the conditions for vacuum plasma activation treatment are: vacuum degree 1.0×10⁻³Pa~5.0×10⁻³Pa, a mixture of oxygen and argon gas with a volume ratio of 1:3~1:5, plasma power 80W~150W, and treatment time 3~8 minutes.

[0017] Furthermore, in step (4), the concentration of nitrogen-doped anatase titanium dioxide in the mixed dispersion is 5 mg / mL to 10 mg / mL.

[0018] The present invention also provides a photocatalytic negative oxygen ion near-field purification glasses, comprising a pair of photocatalytic negative oxygen ion near-field purification glasses components as described in any of the above technical solutions. Beneficial effects

[0019] 1. Full visible light catalysis, can be excited by ordinary indoor and outdoor light, requires no power supply or consumables, and can operate permanently with zero energy consumption; 2. The near-field breathing zone achieves the required purification effect, with a negative oxygen ion concentration of ≥1000 ions / cm³, precisely protecting respiratory health; 3. The photocatalytic film layer is located on the outermost side, directly contacting air and visible light, thus maximizing catalytic efficiency; 4. Plasma activation treatment significantly improves film adhesion, reaching GB / T 9286-1998 standard level 0, and will not peel off or degrade with long-term use; 5. The working process produces no harmful byproducts such as ozone and nitrogen oxides, making it skin-friendly and safe, and suitable for scenarios involving contact with the eyes and skin; 6. It has excellent antibacterial and bacteriostatic properties, which can inhibit the growth of common pathogenic bacteria, making it more hygienic to wear; 7. It can degrade formaldehyde, benzene, TVOC, and odors, purifying the breathing environment in all aspects; 8. The photocatalytic superhydrophilic properties achieve long-lasting anti-fogging, preventing fogging even with temperature differences or when wearing a mask, ensuring clear vision at all times; 9. The membrane has a self-cleaning function; dust, oil, and fingerprints can be wiped away easily, requiring no daily maintenance. 10. Total film thickness ≤300nm, ultra-thin optical design, light transmittance ≥90%, no visual distortion, and does not affect the optical performance of the lens; 11. The film layer is weather-resistant and anti-aging, resistant to sunlight, temperature difference, and sweat corrosion, and will not yellow or crack with long-term use; 12. The multi-layered functional film works together to integrate blue light protection, UV protection, anti-reflection, wear resistance, and anti-fog properties, combining multiple effects into one. 13. A single process can be adapted to all materials of lenses and frames, resulting in strong compatibility and low cost for industrial mass production. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the structure of the photocatalytic negative oxygen ion near-field purification glasses component of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1— Eyeglass substrate 2— Functional film layer 3— Surfaces treated with plasma activation 4— Visible light responsive photocatalyst film layer Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. Example

[0023] The standardized preparation of the lens substrate involves using optical resin lenses, which are pretreated by ultrasonic cleaning for 15 minutes and drying at 60℃ for 30 minutes. Plasma activation parameters are: vacuum 3.0×10⁻³Pa, O₂ / Ar volume ratio 1:4, power 120W, activation for 5 minutes. A blue light blocking functional film is then laminated onto the plasma-activated lens surface. The photocatalyst dispersion consists of 8 mg / mL nitrogen-doped anatase titanium dioxide + 2% Pt-Au-Ag-Pd quaternary noble metal solution + 0.8% dispersant. Film formation involves a 100nm spray thickness, drying at 80℃ for 60 minutes → UV pre-curing for 30 seconds → room temperature cross-linking for 24 hours. Performance testing shows: light transmittance 92%, adhesion GB / T 9286-1998 standard grade 0, near-field negative oxygen ion concentration ≥1300 ions / cm³ under 300 lux indoor light irradiation, and no harmful byproducts. Example

[0024] Standardized preparation of eyeglass frame substrate: The substrate is a polymer eyeglass frame, which is pretreated by ultrasonic cleaning for 18 min and drying at 60℃ for 30 min; Plasma activation parameters: vacuum 5.0×10⁻³Pa, O2 / Ar volume ratio 1:5, power 100W, activation for 7 min; A wear-resistant functional film is laminated on the plasma-activated frame surface; Film forming: spraying thickness 80nm, curing process is the same as in Example 1; Performance testing: adhesion GB / T 9286-1998 standard grade 0, near-field negative oxygen ion concentration ≥1100 ions / cm³, and good stability in use. Example

[0025] When the lenses and frames are combined and assembled, the components prepared in Example 1 and Example 2 are combined and assembled. Under normal indoor lighting, the concentration of negative oxygen ions in the near-field breathing zone is ≥1900 ions / cm³, and the purification effect is significantly improved.

[0026] Comparative Example 1 Unmodified pure TiO2 photocatalyst was used, and the plasma activation step was omitted. Other parameters were the same as in Example 1. Test results: It can only generate a small number of negative oxygen ions under ultraviolet light. The concentration of negative oxygen ions in indoor visible light environment is <180 ions / cm³. The film adhesion is poor and it has no practical value.

[0027] Comparative Example 2 The formula uses a single silver precious metal loading, without quaternary precious metal synergistic catalysis, and other parameters are the same as in Example 1; the test results show that the concentration of negative oxygen ions is <700 ions / cm³, which does not meet the healthy air standard.

[0028] Comparative Example 3 The photocatalytic film layer was placed inside the functional film layer, and other parameters were the same as in Example 1. The test results showed that the near-field negative oxygen ion concentration was <300 ions / cm³, and the catalytic efficiency decreased by 77%, which verified the technical necessity of placing the photocatalytic film layer on the outermost side.

Claims

1. A photocatalytic negative oxygen ion near-field purification eyeglass component, comprising an eyeglass substrate, characterized in that: The eyeglass substrate is an eyeglass lens substrate or an eyeglass frame substrate; the outer surface of the eyeglass substrate is subjected to plasma activation treatment, and a functional film layer and a visible light responsive photocatalytic film layer are sequentially provided from the inside to the outside; the photocatalytic film layer can generate negative oxygen ions under natural light or conventional indoor lighting.

2. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: The photocatalytic film is a composite film of nitrogen-doped anatase titanium dioxide loaded with Pt-Au-Ag-Pd quaternary noble metals, which can respond to the full visible light band of 400nm to 700nm.

3. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 2, characterized in that: The quaternary precious metals are co-loaded in equal amounts, with a total load of 0.05 g / m² to 0.20 g / m².

4. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: The thickness of the photocatalytic film layer is 50nm to 200nm, and the light transmittance is not less than 90%.

5. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: The adhesion of the photocatalytic film layer reaches level 0 of GB / T 9286-1998 standard.

6. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: The lens substrate includes optical resin, PC, PMMA, optical glass, or borosilicate glass; the frame substrate includes polymer materials or metal materials.

7. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: The total thickness of all film layers is no more than 300 nm, and the functional film layer is one or more of the following: anti-blue light film layer, anti-ultraviolet film layer, anti-reflective film layer, or wear-resistant film layer.

8. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 1, characterized in that: When used alone or in combination, this eyewear component can stably generate negative oxygen ions at a concentration of no less than 1000 ions / cm³ within a near-field breathing zone of 30cm×30cm×30cm around the wearer's mouth and nose, while also achieving antibacterial and bacteriostatic functions, degradation of harmful gases, surface self-cleaning, and anti-fogging functions.

9. The photocatalytic negative oxygen ion near-field purification glasses component according to claim 8, characterized in that: No ozone or nitrogen oxides are produced during operation.

10. A method for preparing a photocatalytic negative oxygen ion near-field purification eyeglass component according to any one of claims 1 to 9, characterized in that, Includes the following steps: (1) The eyeglass substrate is subjected to ultrasonic cleaning and drying pretreatment; (2) The surface of the pretreated substrate is subjected to vacuum plasma activation treatment; (3) A functional film layer is composited on the surface of the plasma-activated substrate; (4) A mixed dispersion of nitrogen-doped anatase titanium dioxide and Pt-Au-Ag-Pd quaternary noble metals is prepared and uniformly coated on the outside of the functional film layer; (5) The photocatalytic film layer is obtained by gradient drying at 80℃, UV pre-curing and room temperature cross-linking molding.

11. The preparation method according to claim 10, characterized in that: In step (2), the conditions for vacuum plasma activation treatment are: vacuum degree 1.0×10⁻³Pa~5.0×10⁻³Pa, oxygen and argon mixed gas with a volume ratio of 1:3~1:5, plasma power 80W~150W, and treatment time 3~8 minutes.

12. The preparation method according to claim 10, characterized in that: In step (4), the concentration of nitrogen-doped anatase titanium dioxide in the mixed dispersion is 5 mg / mL to 10 mg / mL.

13. A photocatalytic negative oxygen ion near-field purification glasses, characterized in that: Includes a pair of photocatalytic negative oxygen ion near-field purification glasses components as described in any one of claims 1 to 9.

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