Anti-ultraviolet aging laminated iron
By designing a multilayer film structure with gradient refractive index in coated iron, the problem of easy aging of traditional coated iron under ultraviolet light irradiation is solved, the ultraviolet absorption rate and mechanical strength are improved, and the service life of coated iron is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-13
AI Technical Summary
Traditional coated iron is prone to aging under ultraviolet light. Its narrow ultraviolet absorption band and concentrated interfacial stress lead to film powdering and decreased adhesion, as well as severe light reflection loss, which affects its service life.
The design employs a multilayer film structure, including a metal substrate, a PET layer, a titanium dioxide nanosphere coating, and a silicon oxide thin film layer. By controlling the decreasing refractive index of each layer, a gradient refractive index structure is formed, which improves the ultraviolet absorption rate and reduces reflection loss.
It achieved an ultraviolet absorption rate of over 92% in the 200–400 nm wavelength range, improving the anti-aging properties and mechanical strength of coated iron.
Smart Images
Figure CN223989832U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a coated iron, belonging to the technical field of metal and resin layered products. Background Technology
[0002] Coated iron is a material formed by laminating a polymer film onto the surface of a metal substrate. It offers advantages such as corrosion resistance and ease of processing. However, traditional coated iron is prone to photo-oxidative degradation, leading to film powdering, decreased adhesion, and severely impacting its service life. While adding UV absorbers to the film can partially alleviate these problems in existing technologies, single-material coatings still suffer from drawbacks such as narrow absorption bands and interfacial stress concentration. Furthermore, the multi-layered structure of coated iron and the resulting mismatch in refractive indices between layers can lead to light reflection loss, reducing UV shielding efficiency. Utility Model Content
[0003] To address the shortcomings of the existing technology, this invention provides an anti-UV aging coated iron, solving the UV aging problem of coated iron.
[0004] The technical solution of this utility model is as follows: an anti-ultraviolet aging coated iron, comprising a metal substrate and a PET layer adhered to the surface of the metal substrate, wherein a titanium dioxide nanosphere coating is provided on the PET layer, and a silicon oxide thin film layer is provided on the titanium dioxide nanosphere coating, wherein the refractive index of the PET layer, the titanium dioxide nanosphere coating and the silicon oxide thin film layer decreases in that order.
[0005] Furthermore, the refractive index of the PET layer is 1.57 to 1.62, the refractive index of the titanium dioxide nanosphere coating is 1.5 to 1.55, and the refractive index of the silicon oxide thin film layer is 1.43 to 1.48.
[0006] Furthermore, the thickness of the PET layer is 0.05–0.2 mm.
[0007] Furthermore, the thickness of the titanium dioxide nanosphere coating is 50–500 nm.
[0008] Furthermore, the thickness of the silicon oxide thin film layer is 20–200 nm.
[0009] Furthermore, the titanium dioxide nanospheres in the titanium dioxide nanosphere coating have a particle size of 50–100 nm.
[0010] Compared with the prior art, the advantages of the technical solution provided by this utility model are as follows:
[0011] This invention achieves a synergistic effect of ultraviolet absorption and low reflection loss by forming a multilayer film structure with a refractive index gradient, increasing the ultraviolet absorption rate in the 200nm-400nm range to over 92%, solving the problem of easy aging of traditional coated iron under ultraviolet irradiation, improving the anti-aging performance of coated iron packaging materials, and maintaining excellent mechanical strength. Attached Figure Description
[0012] Figure 1 The diagram shows the structure of the UV-resistant coated iron in Examples 1-4.
[0013] Figure 2 The graph shows the UV absorption rates of Examples 1-4 and Comparative Examples 1 and 2. Detailed Implementation
[0014] The present invention will be further described below with reference to the embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading this description, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[0015] Example 1, please refer to Figure 1 As shown, the UV-resistant coated iron of this embodiment includes a metal substrate 1, which is a chrome-plated iron plate. On the surface of the metal substrate 1 are sequentially a PET layer 2, a titanium dioxide nanosphere coating 3, and a silicon oxide thin film layer 4.
[0016] A titanium dioxide nanosphere coating 3 with a refractive index of 1.52 was prepared on a PET layer 2 with a thickness of 0.1 mm and a refractive index of 1.58. Specifically, titanium dioxide nanospheres with a particle size of 100 nm were added to ethanol and ultrasonically dispersed to form a uniform suspension. Then, a polyvinyl alcohol (PVA) solution with a mass ratio of approximately 0.1% was added to the suspension as a binder, and the mixture was stirred and mixed evenly. The prepared solution was then spin-coated onto the PET layer 2 and dried at room temperature until the ethanol evaporated, resulting in a titanium dioxide nanosphere coating 3 with a thickness of approximately 150 nm and a refractive index of 1.52.
[0017] A silicon dioxide thin film layer 4 with a refractive index of 1.46 and a thickness of 50 nm was prepared on the surface of the dried titanium dioxide nanosphere coating 3 using a sol-gel process. The three-layer structure was then bonded and assembled with a chrome-plated iron plate.
[0018] Example 2 has the same structure as Example 1, except that the PET layer 2 has a thickness of 0.1 mm and a refractive index of 1.57, the titanium dioxide nanospheres in the titanium dioxide nanosphere coating 3 have a particle size of 50 nm, a thickness of 50 nm, a refractive index of 1.55, and a silicon oxide thin film layer 4 has a refractive index of 1.46 and a thickness of 50 nm.
[0019] Example 3 has the same structure as Example 1, except that the PET layer 2 has a thickness of 0.1 mm and a refractive index of 1.57, the titanium dioxide nanospheres in the titanium dioxide nanosphere coating 3 have a particle size of 50 nm, a thickness of 80 nm, a refractive index of 1.5, and a silicon oxide thin film layer 4 has a refractive index of 1.43 and a thickness of 200 nm.
[0020] Example 4 has the same structure as Example 1, except that the PET layer 2 has a thickness of 0.1 mm and a refractive index of 1.62, the titanium dioxide nanospheres in the titanium dioxide nanosphere coating 3 have a particle size of 100 nm, a thickness of 500 nm, a refractive index of 1.55, and a silicon oxide thin film layer 4 has a refractive index of 1.48 and a thickness of 20 nm.
[0021] Comparative Example 1: A PET layer with a thickness of 0.1 mm and a refractive index of 1.58 is placed on the surface of a metal substrate. A silicon oxide thin film layer 4 with a refractive index of 1.46 and a thickness of 50 nm is prepared on the surface of the PET layer by a sol-gel process.
[0022] Comparative Example 2: A PET layer with a thickness of 0.1 mm and a refractive index of 1.58 is placed on the surface of a metal substrate. The surface of the PET layer is coated with titanium dioxide nanospheres with a refractive index of 1.52 and a thickness of approximately 150 nm.
[0023] The absorption rates of light with wavelengths of 200–400 nm in the above embodiments and comparative examples were simulated and calculated, and the results are as follows: Figure 2 As shown, the UV absorption rate of the coated iron in the 200-400 nm range is increased to over 92%. It should also be noted that the thicknesses of the PET layer 2, the titanium dioxide nanosphere coating 3, and the silicon oxide thin film layer 4 have a very limited impact on the overall UV absorption rate of the coated iron. Considering both preparation cost and effectiveness, the thickness of the PET layer is generally chosen to be 0.05-0.2 mm, the titanium dioxide nanosphere coating thickness is 50-500 nm, and the silicon oxide thin film layer thickness is 20-200 nm.
Claims
1. An ultraviolet aging resistant laminated iron comprising a metal substrate and a PET layer adhered to the surface of the metal substrate, characterized in that, The PET layer is provided with a titanium dioxide nanosphere coating, and the titanium dioxide nanosphere coating is provided with a silicon oxide film layer.
2. The anti-UV aged coated steel according to claim 1, characterized in that, The refractive index of the PET layer is 1.57-1.62, the refractive index of the titanium dioxide nanosphere coating is 1.5-1.55, and the refractive index of the silicon oxide film layer is 1.43-1.
48.
3. The anti-UV aged coated steel according to claim 1 or 2, characterized in that, The thickness of the PET layer is 0.05-0.2 mm.
4. The anti-UV aged coated steel according to claim 1 or 2, characterized in that, The thickness of the titanium dioxide nanosphere coating is 50-500 nm.
5. The anti-UV aged coated steel according to claim 1 or 2, characterized in that, The thickness of the silicon oxide film layer is 20-200 nm.
6. The anti-UV aged coated steel according to claim 1 or 2, characterized in that, The particle size of the titanium dioxide nanospheres in the titanium dioxide nanosphere coating is 50-100 nm.