A reverse thermochromic overprint double-layer display two-dimensional code and its preparation method

A thermochromic, two-dimensional display technology, used in instruments, inks, computing, etc., can solve the problems of consumer economic loss of two-dimensional codes, and achieve the effect of enhancing anti-counterfeiting effect, wide range of materials, and convenient application.

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Two-dimensional codes provide a lot of convenience in information storage and identification in life. However, two-dimensional codes are also counterfeited. Some false information of two-dimensional codes have brought great economic losses to consumers. Therefore, in two-dimensional codes The field of anti-counterfeiting should also be taken seriously
However, based on the above existing technologies, it can be found that the existing two-dimensional code improvement technologies focus on the encryption of single-layer information of two-dimensional codes, the increase of the load information of two-dimensional codes, and the single-layer invisible anti-counterfeiting of two-dimensional codes. That is to say, at present, the two-dimensional code can only display one kind of information on the anti-counterfeiting information display, and the invisible two-dimensional code is also a process of information display from scratch. The purpose of high-end anti-counterfeiting has not yet been discovered

Method used

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  • A reverse thermochromic overprint double-layer display two-dimensional code and its preparation method
  • A reverse thermochromic overprint double-layer display two-dimensional code and its preparation method
  • A reverse thermochromic overprint double-layer display two-dimensional code and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The preparation of reversible reverse thermochromic microcapsules that are colorless at room temperature and turn green when heated, the specific steps are as follows:

[0058] (1) Take 3,3-bis(4-diethylamino-2-ethoxyphenyl)-4-azaphthalide and lauric acid in a mass ratio of 1:10, mix and stir evenly, and heat at 120°C Completely melt, and stir the melted mixture into pulverization to obtain the microcapsule core material;

[0059] (2) After mixing melamine powder and 37wt% formaldehyde solution at a mass ratio of 1:4, reacting magnetic stirring in an oil bath at 75° C. for 2 hours, and using triethanolamine to adjust the system pH=8.5 to obtain a microcapsule core wall solution;

[0060] (3) Keep the temperature of the prepared microcapsule core material at 70°C, add 400mL water containing 1.0wt% xanthan gum, use a homogenizer to emulsify for 5min, and keep the temperature at 70°C at a shear rate of 5000r / min; the emulsification ends Finally, add the microcapsule core ...

Embodiment 2

[0063] The preparation of reversible inverse thermochromic microcapsules that are colorless at room temperature and turn black when heated, the specific steps are as follows:

[0064] (1) Take 2-phenylamino-3-methyl-6-dibutylaminofluorane and stearic acid, mix and stir evenly at a mass ratio of 1:10, heat and melt completely at 150°C, and stir the melted mixture into Pulverize to obtain the microcapsule core material;

[0065] (2) After mixing melamine powder and 37wt% formaldehyde solution at a mass ratio of 1:4, reacting magnetic stirring in an oil bath at 75° C. for 2 hours, and using triethanolamine to adjust the system pH=8.5 to obtain a microcapsule core wall solution;

[0066] (3) Keep the temperature of the prepared microcapsule core material at 70°C, add 400mL water containing 1.0wt% xanthan gum, use a homogenizer to emulsify for 5min, and keep the temperature at 80°C at a shear rate of 5000r / min; the emulsification ends Finally, add the microcapsule core wall soluti...

Embodiment 3

[0069] The preparation of the transparent reverse thermochromic ink that is colorless at room temperature and turns green when heated, the specific steps are as follows:

[0070] The colorless heating black ink at room temperature is composed of 3,3-bis(4-diethylamino-2-ethoxyphenyl)-4-azaphthalide reverse thermochromic microcapsules, additives and solvents, In terms of mass percentage, the specific ingredients and formula ratio are:

[0071] 10% of reverse thermochromic microcapsules prepared in Example 1, toluene 18%, emulsified silicone oil 1%, Sylgard184A58%, polyacrylamide 5%, curing agent Sylgard 184B 3% and acrylic resin 5%;

[0072] After mixing the components evenly, stir mechanically at room temperature for 30 minutes, and let it stand for 30 minutes to obtain a colorless ink at room temperature that turns green when heated, which is designated as A ink.

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Abstract

Disclosed are a reverse thermochromic overprinted dual-layer displayed two-dimensional code and a preparation method therefor. The reverse thermochromic overprinted dual-layer displayed two-dimensional code successively comprises a backing layer (1), a fixed color developing layer (2) and a reverse thermochromic layer (3) from bottom to top, wherein the color of the fixed color developing layer (2) does not change with the change of an external environment; and the reverse thermochromic layer (3) is a colorless transparent layer at normal temperature, becomes a colored layer after being heated, and then becomes a colorless transparent layer after being cooled to room temperature. According to the preparation method of the present invention, a two-dimensional code is printed on the backing layer with a conventional UV ink, and then a reversible reverse thermochromic ink which is colorless and transparent at normal temperature and changes color by heating is used to overprint a two-dimensional code on the two-dimensional code printed with the conventional UV ink, so that the reverse thermochromic overprinted dual-layer displayed two-dimensional code is prepared and obtained. The preparation method is easy to operate and is cost-effective.

Description

technical field [0001] The invention relates to the technical field of two-dimensional code display and preparation, in particular to a reverse thermochromic superimposed double-layer display two-dimensional code and a preparation method thereof. Background technique [0002] Two-dimensional code anti-counterfeiting is a kind of anti-counterfeiting technology. Japan is the country that uses the most QR two-dimensional codes, followed by the United States, South Korea, etc. Two-dimensional codes are becoming more and more recognized and accepted by the public. Two-dimensional codes carry out systematic application research and development, and two-dimensional code anti-counterfeiting also conforms to the needs of the market. Through the two-dimensional code anti-counterfeiting system, the encrypted two-dimensional code product information can be generated one by one corresponding to the product, and the two-dimensional code can be printed or labeled on the product packaging, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077C09D11/50C09D11/102C09D11/03
CPCC09D11/03C09D11/102C09D11/50G06K19/0772G06K19/07722G06K19/06037G06K19/0614
Inventor 田君飞徐军飞曹榕陈广学李东建唐华
Owner SOUTH CHINA UNIV OF TECH
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