Anti-ultraviolet photochromic spectacle lens and preparation method thereof

Abstract

The invention discloses an anti-ultraviolet photochromic spectacle lens and a preparation method thereof. The lens comprises a forward-curved resin raw material layer, a backward-curved resin raw material layer and a composite photochromic film layer filled in the forward-curved resin raw material layer and the backward-curved resin raw material layer, and the composite photochromic film layer comprises a non-anti-ultraviolet film layer, a photochromic film layer and an anti-ultraviolet film layer, wherein the two sides of the composite photochromic film layer are coated with a CR.PRIMER coating, and the anti-ultraviolet film layer is close to the backward-curved resin raw material layer. The composite photochromic film layer is applied to the lens, so that the troubles that the conventional photochromic lens does not resist ultraviolet rays and the surface hardness of the photochromic lens is poor are avoided.

Description

technical field [0001] The invention belongs to the technical field of lens processing, and in particular relates to an anti-ultraviolet photochromic spectacle lens and a preparation method thereof. Background technique [0002] Photochromic glasses, in the case of sunlight, can change color into a lens with a deep concentration, which can block the dazzling light, prevent direct sunlight, and protect the eyes; in an environment with soft light, photochromic glasses The lenses become the same as ordinary lenses, transparent and colorless, and adapt to wearing needs in different environments. However, the application of photochromic spectacle lenses with the current production process still has relatively large limitations. The product process analysis of existing photochromic spectacle lenses: [0003] First, the disadvantage of the production process of the substrate photochromic film is that the photochromic powder is dissolved in the middle of the raw material and reac...

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Problems solved by technology

[0003] First, the disadvantage of the production process of the substrate photochromic film is that the photochromic powder is dissolved in the middle of the raw material and reacts with the ultraviolet rays in the sun to achieve the discoloration effect. The premise is that the lens cannot have anti-ultraviolet function, which will affect the lens. The color-changing effect of the internal color-changing components, human eyes exposed to harmful ultraviolet rays can increase the likelihood of eye cataracts and macular degeneration, and can damage the immune system

[0004] Second, the production process and disadvantages of coating discoloration. The coating discoloration can use substrates with different functions. On this basis, dilute discoloration powder into a liquid, and apply it to the lens surface by spin coating. The lens is hardened by heat-setting or light-setting to make the lens have a color-changing effect. The disadvantages of this process are: 1. The hardening effect is poor, the friction coefficient of the lens surface is low, and the lens is easy to scratch

2. Lenses with different curvatures will have uneven coating thickness of the discoloration layer, and the color difference will be large after discoloration

3. Due to the process requirements, 2~3 layers of coating are required for the discoloration of the coating. The firmness of the coating is difficult to control, easy to demould, and the quality is unstable

4. The light-cured coating has poor weather resistance, and the lens coating is prone to yellowing, which affects the wearing appearance

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