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Material and method for preparing holographic color patterns and application of holographic color patterns

A color pattern and color image technology, which is applied to information-carrying cards, printing, instruments, etc., can solve the problems of opaque materials and low substrate selectivity, and achieve the effect of broad application prospects, bright colors, and clear patterns

Active Publication Date: 2020-08-18
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Holographic anti-counterfeiting labels based on grating structures have been widely used in the outer packaging of daily consumer products such as medicine, tobacco and alcohol, but traditional grating structures are often prepared by nanoimprinting, laser engraving, etc. It can only adapt to aluminized plastic film, and the product is almost opaque due to the existence of the underlying metal coating

Method used

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  • Material and method for preparing holographic color patterns and application of holographic color patterns
  • Material and method for preparing holographic color patterns and application of holographic color patterns
  • Material and method for preparing holographic color patterns and application of holographic color patterns

Examples

Experimental program
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Effect test

Embodiment 1

[0055] 1. A material capable of preparing holographic color patterns, which is formed by grafting a photosensitive group and a polymer, wherein the photosensitive group has a structural formula (IV):

[0056]

[0057] The polymer is polyamic acid.

[0058] Its specific preparation process is as follows:

[0059]

[0060] Add 4,4'-biphenylenediamine (18.4 grams) and photosensitive structure-containing biphenylenediamine (111 grams) to the equipment equipped with mechanical stirring and inert gas protection device, add anhydrous N-methyl Pyrrolidone (1556 grams) was stirred and dissolved at 0-25 degrees, and then pyromellitic anhydride (43.6 grams) was added to the above-mentioned materials at one time, and the stirring reaction was continued for 24 hours. After the reaction, a photosensitive polyamic acid solution was obtained. After separation, a photosensitive polyamic acid is obtained.

[0061] Wherein, the range of x:y is between 10:1 and 100:1.

[0062] The photos...

Embodiment 2

[0069] A material capable of preparing holographic color patterns, which is formed by grafting a photosensitive group and a polymer, wherein the photosensitive group has a structural formula (VI):

[0070]

[0071] The polymer is polyamic acid, and the preparation method is the same as in Example 1.

[0072] Wherein, x:y is 10:1.

[0073] The photosensitive group accounts for 2%-15% of the mass fraction of the photosensitive polyamic acid.

[0074] With the photosensitive polyamic acid of above-mentioned preparation as photosensitive coating, adopt the flow process in the embodiment 1 to prepare the holographic color image, can obtain the material of the holographic color pattern that is lighter than the background color of the film of embodiment 1, more transparent ( image 3 ). The reason is that the intrinsic light absorption of the structural formula (VI) is not in the visible region.

Embodiment 3

[0076] The photosensitive polyamic acid prepared in Example 1 was used as a photosensitive coating to prepare a holographic color image. The preparation process was the same as in Example 1, except that the obtained photosensitive polyamic acid solution was evenly cast after being filtered and defoamed. On the clean glass, after the solvent was evaporated at 90 degrees for 5 hours, it was peeled off, and a photolithography machine was used to carry out ultraviolet light engraving to construct patterns, and the film after photolithography was immersed in an ethanol solution containing copper chloride (10g / L). Adsorption, soaking time 15 seconds, take it out, rinse with absolute ethanol, and dry to get Figure 4 The self-supporting transparent holographic patterned film shown.

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Abstract

The invention discloses a material and method for preparing holographic color patterns and application of the holographic color patterns. The material is formed by grafting a photosensitive group anda polymer, wherein the photosensitive group accounts for a mass fraction of 1-25% of the material, and the structure of the photosensitive group is shown in formula (I); and a molecular chain of the polymer contains a group which can react with hydroxyl groups, and the group is selected from one or more of polyurethane, epoxy resin, polyacrylic acid, butyl polyacrylate, polystyrene, polymethyl methacrylate, polyurethane, polyamide acid or polyimide. The material can form a thin film with a pattern and a two-dimensional concave-convex structure on the surface of a variety of substrate materials, an obvious rainbow color pattern is observed under transmitted or reflected light due to diffraction effect, and the pattern color has a strong angle dependence and a magic color effect; and in addition, the preparation of the material is simple, the applicability of a substrate is wide, and a broad application prospect in the field of anti-counterfeiting and decoration and the like is achieved.

Description

technical field [0001] The invention relates to the technical field of optical anti-counterfeiting, more specifically, to a material capable of preparing holographic color patterns, a preparation method and application thereof. Background technique [0002] The micron-scale grating structure can make the material show bright iridescent colors through transmitted or reflected light. Compared with dye colors, the structural colors produced have the advantages of being difficult to imitate and not fading. Holographic anti-counterfeiting labels based on grating structures have been widely used in the outer packaging of daily consumer products such as medicine, tobacco and alcohol, but traditional grating structures are often prepared by nanoimprinting, laser engraving, etc. It can only adapt to aluminized plastic film, and the product is almost opaque due to the existence of the underlying metal coating. [0003] Based on the above-mentioned limitations in the preparation of ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D25/378B42D25/328B42D25/405G03H1/02C08G73/10
CPCB42D25/328B42D25/378B42D25/405C08G73/1007C08G73/1042C08G73/1071G03H1/02G03H2001/0264
Inventor 洪炜
Owner SUN YAT SEN UNIV
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