Window film with automatically adjustable light transmittance

Abstract

The invention relates to a window film with automatically adjustable light transmittance. The window film is prepared by comprising the steps of adding a photochromic dye, an ultraviolet absorbent agent, a pressure-sensitive adhesive and an organic solvent into a stirrer, unceasingly stirring to raise the temperature to be 50 DEG C, then keeping the temperature, unceasingly stirring for 0.5 hours so as to obtain a photochromic pressure-sensitive adhesive; coating the photochromic pressure-sensitive adhesive on a PET (polyethylene terephthalate) base film, drying the PET base film, and compositing the PET base film coated by the photochromic pressure-sensitive adhesive and the PET base film plated with a thermal-protective layer so as to obtain a composite film; coating an anti-scratch coating on one surface of the composite film, solidifying the anti-scratch coating through a UV-irradiation, coating the pressure-sensitive adhesive one the other surface of the composite film, and compositing the pressure-sensitive adhesive surface and a release film. The window film provided by the invention has the advantages that the regulation range of the visible light transmittance is large, the light transmittance is automatically reduced under the highlight environment and can automatically recover under the low light environment, and the colorless light is changed to be colored under the highlight environment, so that the whole beautiful effect is improved, the color kind and light transmittance increasing and decreasing range are adjusted according to the need, the manufacturing process is simple, and the production efficiency is high.

Description

technical field [0001] The invention relates to a window film which can automatically adjust light transmittance. Background technique [0002] As an energy-saving and environmentally-friendly product, window film has broad market development prospects because of its non-polluting and convenient installation. It is mostly used in automobile windows and building windows. It has four basic characteristics: heat insulation and energy saving, UV resistance, privacy and beauty, safety and explosion-proof . [0003] The current global energy shortage makes people pay more and more attention to the development of energy-saving products. Glass is widely used in various fields as a transparent product. However, from the perspective of energy saving, the heat conduction characteristics of glass often lead to energy loss. Therefore, more and more companies have begun to develop and produce film products that can reduce glass energy loss. At present, there are four types of window fi...

AI Technical Summary

Problems solved by technology

However, from the perspective of energy saving, the heat conduction characteristics of glass often lead to energy loss. Therefore, more and more companies have begun to develop and produce film products that can reduce glass energy loss.

At present, there are four types of window films on the market: the first category, colored film, surface dyed film and primary color film are coated and compounded with a release film to form a window film product. Its main function is to block strong Sunlight, the product does not have the effect of heat insulation, only for shading, the clarity is extremely poor

The second type, heat insulation film, adopts vacuum evaporation process or magnetron sputtering process to evaporate heat insulation or heat insulation alloy layer on PET substrate, and then forms the product with release film through coating and composite process to achieve a certain Heat insulation effect, but its weakness is low definition, high reflection, easy to cause visual fatigue and cause accidents

The third category, thermal insulation composite film, is a window film product composed of transparent film or colored film, thermal insulation film, scratch-resistant coating multi-layer plastic film through coating and compounding process and release film. The effect and visual performance have been greatly improved, but the preparation of the heat insulation film used in the product is complicated and the cost is high. Among them, the fireproof performance of the heat insulation layer is somewhat poor, and it is easy to be oxidized when directly exposed to air and sunlight. It leads to a reduction in the heat insulation effect and a shortened service life, and the heat insulation film has a certain shielding effect on WIFI, GPS, radio signals, and mobile phone signals

Window films with photochromic effects can solve this problem very well, but the photochromic window films currently on the market have a small change in color, have no obvious effect on controlling light intensity, and have slow response speeds. Dangers are likely to occur in special road conditions such as tunnels

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