Patterned photochromic transparent film and preparation method thereof

Abstract

The invention discloses a patterned photochromic transparent film and a preparation method thereof. The method comprises the following steps: forming a photochromic material on the surface of a prepared nanofiber film according to a desired pattern, performing covering by using epoxy resin, and performing curing to obtain the patterned photochromic transparent film. Through the above manner, the opaque nanofiber film shows a transparent state under the action of the epoxy resin, so that the effective protection of the photochromic material is realized and the service life is prolonged withoutaffecting light transmission; the synergy between the nanofiber film and the epoxy resin is used, so that the non-patterned area of the prepared photochromic transparent film has higher transparency,and the photochromic transparent film has better mechanical properties; and the preparation process is simple, the content and pattern shape of the photochromic material can be freely selected according to needs, the controllability is strong, large-area production can be realized, and the practical application range is wide.

Description

technical field [0001] The invention relates to the technical field of photochromism, in particular to a patterned photochromic transparent film and a preparation method thereof. Background technique [0002] Photochromic film is a film containing photochromic material, which can change color after being excited by light source, has excellent optical sensitivity and reversible color change, so it is widely used in decoration, protective packaging, anti-counterfeiting and information storage and other fields. Existing photochromic films are usually prepared directly by mixing photochromic materials with solvents. The photochromic materials of this type of photochromic film are directly exposed to the air and are exposed to direct ultraviolet radiation for a long time, so they are easily oxidized and decomposed. Aging, poor fatigue resistance, thereby reducing the use effect and life of the photochromic film. Therefore, it is necessary to provide a new photochromic film to i...

AI Technical Summary

Problems solved by technology

The patent whose publication number is CN102219987A provides a photochromic polyethylene terephthalate mixed film and its preparation method. After blending polyethylene terephthalate and photochromic materials, the solution is used to The film is made into a film by the film-forming method, which avoids the contact of the photochromic material with water and oxygen, thereby preventing its degradation and improving its service life; however, the photochromic material in the film prepared by this method is evenly distributed, and can only change color as a whole under light , cannot form patterns, and the aesthetics is insufficient; at the same time, the mechanical properties of the film prepared by this method still need to be improved

[0004] The patent with the publication number CN206431385U provides a photosensitive plastic color-changing film. By setting a protective layer outside the color-changing layer containing the photochromic material, the photochromic material in the color-changing layer is avoided from escaping, and by setting a gap in the color-changing layer, Form a pattern; but because the bottom protective layer and the top protective layer of the color-changing film are set separately, the combination is not tight enough, and gaps are easily generated after long-term use, and the protection of the photochromic material is insufficient; at the same time, due to the multi-layer material of the color-changing film There is no interaction between them, only simple superposition, and its transparency decreases with the increase of the number of layers, making the definition not high and affecting the overall effect of the pattern

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