Preparation method of pyrazolone/polymer composite photochromic film

Abstract

The invention relates to a preparation method of a pyrazolone/polymer composite photochromic film. A high-performance water-insoluble pyrazolone photochromic material, i.e. 1, 3-diphenyl-4-(3'-bromobenzylidene)-5-pyrazolone-shrinking phenyl semicarbazide (DP3BrBP-PSC) is used as a photochromic unit, water-soluble high polymers, i.e. hydroxypropyl methyl cellulose (HPMC) and polyvinyl alcohol (PVA) are used at the same time, distilled water is used as solvent, a physical doping dispersion method is used and continuous agitation is conducted to obtain composite material suspension; and after the suspension is statically placed in a dark place and is defoamed and a pouring method is used for preparing the pyrazolone/polymer composite photochromic film which has the advantages of high photochromic property, even texture and good transparency, flexibility and mechanical property. The preparation method has the advantages of simplicity in operation and lower cost.

Description

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AI Technical Summary

Benefits of technology

This technology uses an easy-to-apply chemical process called dispersive mixing for creation of photosensitive compositions that are highly transparent without losing their effectiveness over time due to external factors such as light or oxygen exposure. These films have excellent qualities like high UV absorption ability with no yellowish tinge on them when exposed to sunlight. They also show improved durability against damage caused by bending stress compared to traditional methods used beforehand.

Problems solved by technology

This patented describes different types of photochromism used in various industries such as printing technologies like offset lithography, laser printers, displays, security documents, etc., where it plays important roles due to its ability to convert light signals from electronic devices back into colored images through reflection or scatterings caused by interactions involving electric field fluctuations. Current methods involve adding dyes onto specific areas within the photosensitive layer, but they cannot achieve complete darkness without changing colors over time.

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