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Preparation method and application of anti-counterfeit label based on temperature-induced phase change hydrogel

An anti-counterfeiting label and hydrogel technology, applied in the field of anti-counterfeiting label design, can solve the problems of low security of the anti-counterfeiting label, weak pattern coding ability, etc., and achieve high anti-counterfeiting security, simple synthesis method, and obvious change in light transmittance. Effect

Active Publication Date: 2022-01-28
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Based on this, the present invention provides a preparation method and application of an anti-counterfeit label based on temperature-induced phase change hydrogel to solve the problem of the security of existing anti-counterfeit labels Not high, the technical problem of pattern coding ability is not strong

Method used

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  • Preparation method and application of anti-counterfeit label based on temperature-induced phase change hydrogel
  • Preparation method and application of anti-counterfeit label based on temperature-induced phase change hydrogel
  • Preparation method and application of anti-counterfeit label based on temperature-induced phase change hydrogel

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preparation example Construction

[0031] According to the above ideas, the present invention provides a method for preparing an anti-counterfeiting label based on a thermo-induced phase change hydrogel, such as figure 1 Shown, this preparation method comprises the following steps:

[0032] Step S1, mixing two monomers, N,N-dimethyl(acrylamidopropyl)ammonium butanesulfonate and acrylamide, or isopropylacrylamide and acrylamide to obtain a mixed monomer.

[0033] In the above step S1, N,N-dimethyl(acrylamidopropyl)ammonium butanesulfonate is obtained through the following steps, specifically: 1,4-butane sultone and N-[3-(dimethylamino) Propyl]acrylamide was respectively dissolved in acetonitrile solvent, the two were slowly mixed together, stirred at room temperature 25°C for 1 day, a white precipitate was obtained, and the corresponding product could be obtained after cooling, washing, filtering, and vacuum drying, wherein, 1, The molar ratio of 4-butane sultone and N-[3-(dimethylamino)propyl]acrylamide is 1:1...

Embodiment 1

[0049] The process of preparing an anti-counterfeiting label from a temperature-induced phase change hydrogel based on the highest critical solution temperature is as follows:

[0050] Add 300mg N,N-dimethyl(acrylamidopropyl)ammonium butanesulfonate (NDAABS), 53.07mg acrylamide (AM), 10.36mg N,N'-methylenebisacrylamide (BIS) and 3.83mg persulfuric acid Ammonium (APS) was added to 3.53 mL of water and fully dissolved with magnetic stirring at 25°C;

[0051] Then let it stand at 25°C for more than 30 minutes, then add 2.52uL of N,N,N',N'-tetramethylethylenediamine (TEMED) to the mixture while stirring, and then inject the mixed solution with a syringe Quickly transfer to a transparent acrylic substrate, and stand at 25°C for 12 hours to solidify into a gel. The obtained product can be found in figure 2 As shown in (a), the anti-counterfeiting label is obtained.

Embodiment 2

[0053] refer to figure 2 As shown, the process of preparing an anti-counterfeiting label from a temperature-induced phase change hydrogel based on the lowest critical solution temperature is as follows:

[0054] Add 300 mg of isopropylacrylamide (NIPAAm), 37.69 mg of acrylamide (AM), 4.9 mg of N,N'-methylenebisacrylamide (BIS), and 7.26 mg of ammonium persulfate (APS) into 3.38 mL of water for 25 Magnetic stirring at ℃ to fully dissolve;

[0055] Then freeze and stand at 4°C for more than 30 minutes, then add 3.98uL of N,N,N',N'-tetramethylethylenediamine (TEMED) to the mixture while stirring, and then inject the mixed solution with a syringe Quickly transfer to a transparent substrate made of transparent acrylic, and stand at 4°C for 12 hours to solidify into a gel. The obtained product can be found in figure 2 As shown in (b), the anti-counterfeiting label is obtained.

[0056] The method of this example 1 and 2 is changed by changing the acrylamide (AM) and isopropylac...

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Abstract

The invention relates to a preparation method and application of an anti-counterfeit label based on temperature-induced phase change hydrogel, and the method comprises the following steps: mixing two monomers of N, N-dimethyl (acrylamide propyl) ammonium butanesulfonate and acrylamide, or mixing isopropyl acrylamide and acrylamide to obtain a mixed monomer; uniformly dissolving a mixed monomer, a cross-linking agent and an initiator in water, standing in a preset temperature environment for more than 30 min, then adding a reducing agent, and uniformly stirring to obtain a mixed solution, the cross-linking agent being N, N '-methylene bisacrylamide, the initiator being ammonium persulfate, and the reducing agent being N, N, N', N'-tetramethylethylenediamine; and transferring the obtained mixed solution into a transparent substrate with a groove pattern, and carrying out polymerization reaction in a pattern area to coagulate into gel, so as to obtain the anti-counterfeit label of the temperature-induced phase change hydrogel based on the lowest critical solution temperature or the highest critical solution temperature. The anti-counterfeit label prepared by the invention is relatively high in identification degree, relatively high in anti-counterfeit safety and relatively strong in coding capability.

Description

technical field [0001] The invention relates to the field of anti-counterfeit label design, in particular to a preparation method and application of an anti-counterfeit label based on a temperature-induced phase change hydrogel. Background technique [0002] Information leaks and counterfeit products seriously endanger the safety of human property, health and social stability. There is no doubt that anti-counterfeiting labels are the key technology to curb the rampant counterfeiting. Generally, researchers are committed to obtaining perfect anti-counterfeiting technology should have the following points: (1) cannot be cloned or extremely difficult to copy; (2) information is easy to read; (3) information storage capacity is large; (4) high stability; (6) Low cost. In recent years, scientists have proposed various anti-counterfeiting strategies, including watermarks, graphic codes, structural colors, fluorescence, holographic imaging, molecular tags and other technologies. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/02C08F220/56C08F220/58C08F222/38C08F220/54C08J3/075C08L33/26
CPCG09F3/0294C08F220/56C08J3/075C08J2333/26C08F220/585C08F222/385C08F220/54
Inventor 刘卫娄东阳郑治坤陈旭东
Owner SUN YAT SEN UNIV
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