Preparation method of pyrazolone/polymer composite photochromic film

A technology of pyrazolone and polymer is applied in the field of preparation of pyrazolone/polymer composite photochromic film, can solve problems such as inconvenience of manufacture, and achieve the effects of low cost, uniform texture and good transparency

Inactive Publication Date: 2012-08-22
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method of pyrazolone/polymer composite photochromic film
  • Preparation method of pyrazolone/polymer composite photochromic film
  • Preparation method of pyrazolone/polymer composite photochromic film

Examples

Experimental program
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Effect test

Embodiment 1

[0016] At room temperature, under the condition of magnetic stirring, slowly add 0.25 g of HPMC white powder into 20 ml of distilled water, and keep stirring to fully dissolve HPMC to form a clear solution. Then, under the condition of avoiding light, slowly add 0.05 g of DP3BrBP-PSC white powder into the clear solution, and continue to stir for 3 hours, so that DP3BrBP-PSC is well dispersed in the clear solution to obtain a co-suspension, After defoaming by standing in the dark, the blended suspension was slowly poured into a clean glass tank, and dried overnight at room temperature in the dark to obtain a pyrazolone / polymer composite photochromic film. The composite film has good photochromic properties, and it turns from white to yellow after being irradiated with 365nm ultraviolet light.

[0017] The above-mentioned composite film has good photochromic performance, and the ultraviolet absorption spectrum of the composite film is shown as follows: figure 1 As shown, it is ...

Embodiment 2

[0019] At 60°C, under the condition of magnetic stirring, slowly add 3 grams of PVA white particles into 20 ml of distilled water, and stir for 1 hour to fully dissolve the PVA and form a clear solution. Then, 0.06 g of DP3BrBP-PSC white powder was slowly added to the clear solution at room temperature and protected from light, and the stirring was continued for 5 hours, so that DP3BrBP-PSC was well dispersed in the clear solution to obtain a co-suspension, After defoaming by standing in the dark, the blended suspension was slowly poured into a clean glass tank, and dried overnight at room temperature in the dark to obtain a pyrazolone / polymer composite photochromic film. The composite film has good photochromic properties, and it turns from white to yellow after being irradiated with 365nm ultraviolet light.

[0020] After irradiating with 365nm ultraviolet light, the ultraviolet absorption spectrum of the composite film is as follows: image 3 As shown, it is found that a n...

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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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Claims

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Application Information

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Owner XINJIANG UNIVERSITY
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