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Anti-counterfeiting film with multiple anti-counterfeiting effects, and preparation method thereof

A thin film and multiple technology, applied in the field of anti-counterfeiting, can solve the problems of poor anti-counterfeiting optical effects, etc., and achieve the effect of improving the brightness of graphics, improving the degree of phase separation, and improving the diffraction efficiency

Active Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported anti-counterfeiting films have deficiencies in both aspects, resulting in poor anti-counterfeiting optical effects, and usually need to add an additional reflective layer to improve the brightness of the image and text

Method used

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  • Anti-counterfeiting film with multiple anti-counterfeiting effects, and preparation method thereof
  • Anti-counterfeiting film with multiple anti-counterfeiting effects, and preparation method thereof
  • Anti-counterfeiting film with multiple anti-counterfeiting effects, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 20wt% hyperbranched monomer (A[n=1, m=4, R is I] and B[n=3, m=1, R is V] with a mass ratio of 2:1), 25wt% of 2-isooctyl acrylate, 10wt% N-vinylpyrrolidone, 44wt% responsive liquid crystal (9:1 E7 and 4-butyl-4′-methoxyazobenzene) and 1wt% photoinitiated The agent double 2,6-difluoro-3-pyrrole phenyl titanocene was ultrasonicated at 40°C until a transparent solution was formed, and after cooling, it was uniformly coated on the support film PMMA, covered with a protective film PMMA, and placed in a 405nm laser interference Write three-dimensional graphic information in the field, and then uniformly expose under ultraviolet light to form an anti-counterfeiting film with a holographic recording layer thickness of 10 μm. The prepared anti-counterfeiting film has visible graphic and text information; when the anti-counterfeiting film is heated, the graphic and text information becomes light, and when the temperature reaches about 65°C, the graphic and text information disappe...

Embodiment 2

[0027] 60wt% hyperbranched monomer (C[n=2, m=4, R is II], D[n=4, m=4, R is VI], 6361-100 and F[R is I]), 5wt% 2-isooctyl acrylate, 10wt% N-vinylpyrrolidone, 24.5wt% responsive liquid crystal (8:2 E7 and 4-butyl- 4′-methoxyazobenzene) and 0.5wt% photoinitiator bis-2,6-difluoro-3-pyrrolephenyl titanocene, sonicated at 50°C until a transparent solution was formed, and coated evenly after cooling On the supporting film PMMA, cover the protective film PMMA, place it in a 405nm laser interference field to write three-dimensional graphic information, and then uniformly expose it under ultraviolet light to form an anti-counterfeiting film with a holographic recording layer thickness of 100 μm. The prepared anti-counterfeiting film has clear graphic information, high brightness, and has a three-dimensional (stereoscopic) viewing angle discoloration effect; when the anti-counterfeiting film is heated, the graphic information becomes light, and when the temperature reaches about 65°C, th...

Embodiment 3

[0029]With 54.5wt% hyperbranched monomer (mass ratio is 1:2:1:2:3:5:1:2:5 A[n=3, m=3, R is II], B[n= 3, m=3, R is IV], C[n=3, m=3, R is II], D[n=4, m=4, R is VI], E[n=2, m=4 , R is Ⅳ], F[R is Ⅳ], G[n=4, m=4, R is Ⅱ], H[n=3, m=3, R is Ⅲ] and 6361-100), 5wt% 2-isooctyl acrylate, 20wt% N-vinylpyrrolidone, 20wt% responsive liquid crystal (7:3 P0616A and 4-butyl-4′-methylazobenzene) and 0.5wt% light The initiator bis-2,6-difluoro-3-pyrrole phenyl titanocene is ultrasonicated at 60°C until a transparent solution is formed, and after cooling, it is evenly coated on the support film PMMA, covered with a protective film PMMA, and placed at 441.6nm Three-dimensional graphic information is written in the laser interference field, and then uniformly exposed under ultraviolet light to form an anti-counterfeiting film with a holographic recording layer thickness of 50 μm. The prepared anti-counterfeiting film has clear graphic information, high brightness, and has a three-dimensional (ste...

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Abstract

The invention provides an anti-counterfeiting film with multiple anti-counterfeiting effects, and a preparation method thereof. The anti-counterfeiting film sequentially comprises a supporting film, a hologram recording layer and a protection film. The preparation method comprises: uniformly packaging a solution between the supporting film and the protection film, wherein the solution comprises a hyperbranched monomer, 2-ethylhexyl acrylate, N-vinyl pyrrolidone, a responsive liquid crystal and a light initiator; and then reading three dimensional graphic and text information in a laser interference field. The anti-counterfeiting film has characteristics of clear graphic and text and high brightness, wherein an observer can observe changes of graphic and text information recorded on the anti-counterfeiting film and color when the observer changes the observation angle. In addition, when 365 nm ultraviolet light or 532 nm visible light is adopted to illuminate the anti-counterfeiting film, or the anti-counterfeiting film is heated, the recorded anti-counterfeiting graphic and text fades or disappears, and the clear anti-counterfeiting graphic and text can be seen again when illumination is removed or cooling is performed.

Description

technical field [0001] The invention relates to anti-counterfeiting technology, in particular to an anti-counterfeiting film with multiple anti-counterfeiting effects and a preparation method thereof. The prepared anti-counterfeiting film has optical characteristics that can be distinguished by the naked eye, and has multiple functions of changing graphic information under stimulation such as light and temperature. Anti-counterfeiting features. Background technique [0002] Counterfeit and shoddy products endanger national security and people's normal life, and the development of anti-counterfeiting technology is particularly important to crack down on counterfeiting and sales and promote the normal construction of an orderly market. Anti-counterfeiting technology can be roughly divided into two categories: one is that the authenticity can be distinguished without tools, and the observer can identify security information such as material, hardness, texture, graphics, color, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/36C09D4/02G03F7/027
Inventor 解孝林彭海炎周兴平郑成赋葛宏伟
Owner HUAZHONG UNIV OF SCI & TECH