Preparation method of anti-reflection film

Abstract

The invention discloses a preparation method of an anti-reflection film. The preparation method comprises the following steps: A, taking silicon alkoxide, an alcohols solvent and a silane coupling agent to be mixed and stirred to obtain a mixed solution A; B, taking an acid catalyst and deionized water to be mixed and stirred to obtain a mixed solution B; C, slowly dropwise adding the mixed solution B into the mixed solution A to obtain silica sol; D, taking the silica sol, hollow silicon dioxide particles and a dispersing agent to be mixed and stirred to prepare and obtain a coating film solution; E, selecting a glass substrate to be polished, washed and dried; F, coating the coating film solution on the glass substrate, leveling, drying and curing to obtain a film layer; and G, putting the glass substrate in an alkaline solution for corrosion, forming concave-convex fabric surface on the surface of the corroded film layer, and then washing and drying to obtain coated glass. The interior of the anti-reflection film prepared and obtained by using the preparation method is of a hollow pore structure, and the concave-convex fabric surface is on the surface of the anti-reflection film, so that the average reflectivity can be reduced by 2% or lower.

Description

Technical field: [0001] The invention belongs to anti-reflection coating technology, and in particular relates to a method for anti-reflection and anti-reflection coatings. Background technique: [0002] With the widespread use of glass, there is an increasing demand for reducing the reflectivity of the glass surface. For ordinary glass, the reflectivity is generally 8% to 10%, which will cause the reflection of objects on the side of the observer to appear on the glass surface, affecting the observer's observation of objects on the other side of the glass. These problems are applied and displayed in the exhibition hall counter glass. It is especially prominent in application scenarios such as the application of screen glass and the reflection of objects inside the car on the front windshield of the car at night, which is easy to cause visual fatigue. In order to reduce visual fatigue and overcome glare, anti-reflection glass that can reduce the reflectivity of light has be...

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Problems solved by technology

However, it has been proved by practice that the distribution of hollow silica particles in the film layer is not easy to control. The effect of reducing the reflectivity is not ideal if the amount of hollow silica particles is added, and the haze of the film layer will be increased if the particles are added or the distribution is uneven, and the transparency will be reduced. The problem of mutual restriction between the salt spray resistance and weather resistance of the existing anti-reflection coating and the anti-reflection performance is that the reason is that in order to reduce the refractive index of the anti-reflection coating, the coating must have a certain porosity, but The pores make the structure of the film layer loose and the binding force is reduced, which makes the film layer unable to be used normally. Therefore, the refractive index of the anti-reflection film layer prepared by this method cannot be reduced too low, so that the glass applied with the anti-reflection film layer has a thickness between 380nm and 780nm. In the visible light band, the minimum reflectance can only be reduced to about 2% to 4%, and it is increasingly difficult to meet the demand for products such as automotive glass, locomotive glass, and aircraft glass that have increasingly high requirements for anti-reflection.

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