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Composite photochromic polyaminoester material and preparation method thereof

A technology of color-changing materials and composite light, applied in the field of photochromic materials, to achieve the effects of low-cost production, wide application range, and shortened production cycle

Inactive Publication Date: 2004-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are many forms of photochromic film (CN1408801A, CN2567712Y), but it is composed of organic and inorganic materials, the color changing effect can be set by computer in advance, and there is no report that it can be made into color changing ink

Method used

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  • Composite photochromic polyaminoester material and preparation method thereof
  • Composite photochromic polyaminoester material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of polyurethane colloid

[0028] Take component A, component B, solvent, and catalyst 200:200:2000:20ml and pour them into the container one by one for preliminary mixing, and then pour them into the reaction kettle with magnetic stirrer and thermometer condenser tube to stir, and react 2-5 hours, the reaction temperature is about 30°C.

Embodiment 2

[0030] Metal-dielectric color-changing film with Cr / polyurethane / Al three-layer structure prepared on polyester film (PET) ( figure 2 ).

[0031] A layer of aluminum film with a thickness of 80-100nm is grown by sputtering on the PET film, and then polyurethane colloid is coated on the aluminum film on a coating machine and dried to form a dielectric layer of 400-500nm. Finally, a chromium film with a thickness of 12-20nm is deposited on the dielectric layer by sputtering to obtain the multilayer color-changing film of the present invention which is golden yellow at normal incidence and blue at 45° incidence.

Embodiment 3

[0033] Prepare color shifting inks.

[0034] Coating a layer of release agent on the plastic film, then depositing 10-20nm chrome film absorbing layer on the release agent by sputtering, coating 250-400nm polyurethane colloid on the chrome film, and drying. Then a 100-200nm aluminum film reflective layer is deposited on the dielectric layer by sputtering, and then 250-400nm polyurethane colloid is coated on the aluminum film and dried. Finally, a 10-20nm thick chromium absorbing layer is deposited on the dielectric layer by sputtering to obtain a metal-dielectric color-changing film with a five-layer symmetrical structure. After demoulding, the base plastic is removed, and then crushed to prepare the photochromic raw material of the color-changing ink, which can be added to the ink to make the color-changing ink.

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Abstract

The invention discloses a low cost organic and inorganic composite phototropic film material and method for its preparation wherein the method comprises according to the requirement of real time use and color change, designing film system arrangement by applying the optical principle of multilayer film interference, combining physical phase applying method with sol chemical applying method, obtaining the composite off-color material at least comprising reflecting layer, dielectric layer and absorption layer. The invention can be applied to the field of counterfeit deterrence.

Description

technical field [0001] The invention belongs to the technical field of photochromic materials, and in particular relates to a film structure design and a preparation method of a polyurethane photochromic composite material. Background technique [0002] With the rapid development of economy and technology, the requirements for anti-counterfeiting technology and anti-counterfeiting products are getting higher and higher. Not only the simple "expert anti-counterfeiting" and "public anti-counterfeiting" are adopted, but also the "hybrid anti-counterfeiting" combining the two is developed. . The so-called "expert anti-counterfeiting" is to add some materials that can only be identified by instruments to the anti-counterfeiting object, such as the invisible printed characters composed of five-color fluorescent ink anti-counterfeiting materials added to the currency by ultraviolet light emitted by the ultraviolet tube lamp to become visible; Use an infrared spectrum analyzer to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/02
Inventor 倪星元张志华吕俊霞沈军周斌吴广明
Owner TONGJI UNIV
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