Preparation method of electrochromic film

Abstract

A preparation method of an electrochromic film comprises the following steps: (1) 1-20 parts by weight of a surface charge-coated sheet material, 60-90 parts by weight of an acrylic resin, 5-10 partsby weight of a photoinitiator and 1-10 parts by weight of a transparent color pigment are taken, and are ultrasonically dispersed to obtain a coating; and (2) the coating obtained in step (1) is applied between two layers of a conductive transparent film, and the electrochromic film is formed under an applied voltage in order to achieve the electrochromic photoregulation color change function. When the coating is located in an applied electric field, the charged sheet material is arranged in a regular sequence under the action of the electric field, so lights can permeate the film. Adjustmentbetween transparence and non-transparence is realized through power on-off, so electrochromism is achieved in the case of color.

Description

technical field [0001] The invention belongs to the technical field of coating films, and relates to a preparation method of an electrochromic coating film. In particular, it relates to a method for preparing an electrochromic light-emitting coating film by using sheet-shaped materials to undergo directional alignment under an external electric field condition after surface charge treatment. Background technique [0002] Dimming coating usually refers to the use of polymer dispersed liquid crystal (PDLC) composition coated between two conductive films, and the light transmittance of the film layer changes when an applied voltage is applied, thereby realizing the intelligent dimming function. PDLC composition and coating curing process are the core. Polymer Dispersed Liquid Crystal (PDLC for short) is a liquid crystal / polymer composite material in which liquid crystal is uniformly dispersed in a polymer matrix in the form of droplets. It has controllable electric field and g...

AI Technical Summary

Problems solved by technology

Among them, the relatively high driving voltage of PDLC has become one of the reasons why it is difficult to achieve commercialization. Therefore, effectively reducing the driving voltage of PDLC while maintaining contrast and response time has become a major difficulty and hot spot in improving the photoelectric performance of PDLC. The technical improvement methods for driving voltage mainly focus on the chemical synthesis and replacement of liquid crystal and polymer itself, the research of film formation process or the change of driving mode. These methods can improve the photoelectric properties of materials to a certain extent, but the preparation process is complicated. Higher requirements for equipment

[0004] At present, with the rapid development of the advertising industry, the bottom boards for advertising display include wooden boards, plastic boards, wood-plastic boards, metal boards, etc. Traditionally, direct advertising by spray printing or painting is likely to cause serious waste of resources , the replacement of advertisements also requires cleaning and other processing, which is time-consuming, laborious and inconvenient

In addition, due to the poor high temperature resistance of liquid crystal materials (generally, the long-term use temperature does not exceed 70 degrees), and the poor UV aging resistance of organic resin materials (generally, long-term UV aging does not exceed two years), ordinary PDLC dimming coatings are only suitable. For indoor partitions, etc., it is not suitable for long-term use in the environment of high temperature and strong ultraviolet outside windows, which greatly restricts the application field