A kind of material that can prepare holographic color pattern and its preparation method and application

A color pattern and color image technology, applied in information-carrying cards, instruments, printing, etc., can solve the problems of opaque materials and low selectivity of substrates, and achieve broad application prospects, bright colors, and simple preparation methods Effect

Active Publication Date: 2021-05-25
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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  • A kind of material that can prepare holographic color pattern and its preparation method and application
  • A kind of material that can prepare holographic color pattern and its preparation method and application
  • A kind of material that can prepare holographic color pattern and its preparation method and application

Examples

Experimental program
Comparison scheme
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 capable of preparing holographic color patterns, a preparation method and application thereof. The material is formed by grafting a photosensitive group and a polymer, wherein the photosensitive group accounts for 1-25% of the mass fraction of the material, and the structure of the photosensitive group is shown in formula (I); wherein the The molecular chain of the polymer contains groups that can react with hydroxyl groups, selected from polyurethane, epoxy resin, polyacrylic acid, polybutyl acrylate, polystyrene, polymethyl methacrylate, polyurethane, polyamic acid or polyamide one or more of the imines. The material of the present invention can form thin films with patterns and two-dimensional concave-convex structures on the surface of various base materials. Under the transmitted light or reflected light, due to the diffraction effect, an obvious iridescent pattern is observed, and the pattern color has a strong color. Angle-dependent, and has the effect of magic color; in addition, the material is simple to prepare, has wide substrate applicability, and has broad application prospects in the fields of anti-counterfeiting, decoration and the like.

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 Patents(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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