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Oxygen sensitive variable ink and preparation method thereof

An oxygen-sensitive, color-changing ink technology, applied in the ink field, can solve the problems of poor adhesion of smart pigments, achieve the effects of enhancing adhesion, improving stability, and avoiding direct contact

Inactive Publication Date: 2015-07-08
SHENZHEN NINE STARS PRINTING & PACKAGING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an oxygen-sensitive color-changing ink, which aims to solve the technical problems that the existing intelligent pigments have poor adhesion and that the intelligent pigments can only be used in a dry environment due to their hydrophilic and hygroscopic properties

Method used

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preparation example Construction

[0050] The present invention also provides a method for preparing an oxygen-sensitive color-changing ink. In a preferred embodiment, the preparation method includes the following steps:

[0051] Add hydrophobic agent and organic solvent into the sample bottle, and stir the hydrophobic agent to dissolve into solution;

[0052] Add electron donor material into the solution and stir evenly;

[0053] Then add photocatalyst material, after dispersing evenly, add oxygen-sensitive reactive dye, and seal the sample bottle, stir until the oxygen-sensitive reactive dye is completely dissolved;

[0054] Open the vial, add binder to the vial, and stir.

[0055] The preparation method of this preferred embodiment is simple, and a UV-activated oxygen-sensitive color-changing ink is prepared.

[0056] The present invention also provides a method for preparing an oxygen-sensitive color-changing ink. In another preferred embodiment, the preparation method includes the following steps:

[00...

Embodiment 1

[0064] Preparation of ethanol-based non-UV-activated oxygen-sensitive color-changing ink

[0065] Add 200 mg of sulfonated polystyrene (SPS) to the sample bottle, add 2 mg of ethanol and 800 mg of purified water, stir gently, add 16 mg of methylene blue after all the sulfonated polystyrene is dissolved, and continue stirring the solution until Dissolve all the methylene blue, add 0.5ml 0.43mol / L sodium dithionite (about 37mg), at this time, the color of the solution changes from blue to light yellow, then add 100mg polyvinyl butyral, stir until the mixture becomes viscous , that is, made of non-UV-activated oxygen-sensitive color-changing inks.

[0066] It should be understood that sodium dithionite in this embodiment can be replaced by oxidation products of sodium sulfite such as sodium sulfite or thiosulfate and bisulfite, and the ratio of ethanol and water in the formula can be appropriately adjusted according to the viscosity requirements of the color-changing ink.

Embodiment 2

[0068] Preparation of acetone-based UV-activated oxygen-sensitive color-changing ink

[0069] Add 700 mg of sulfonated polystyrene (SPS) to the vial, add 4 g of acetone, and stir gently until all the polymer is dissolved, add 500 mg of glycerin to the solution, and stir again gently to increase its degree of solubility;

[0070] Add 200mg of nano-titanium dioxide, stir the solution until all the nano-titanium dioxide is uniformly dispersed, add 5mg of methylene blue, seal the sample bottle with paraffin to reduce the evaporation of acetone, and then stir, usually for more than 8 hours, to ensure that all the methylene blue is dissolved; Then open the sample bottle and add 200 mg of polyvinyl butyral, stir until the mixture becomes viscous, and then make an acetone-based UV-activated oxygen-sensitive color-changing ink.

[0071] It should be understood that the blue depth of the color-changing ink can be increased by appropriately increasing the proportion of methylene blue. ...

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Abstract

The invention discloses an oxygen sensitive variable ink. The oxygen sensitive variable ink comprises the following components: an oxygen sensitive reactive dye, a reducing agent, a binder, a hydrophobic agent and an organic solvent. By adopting the binder of the variable ink, the film formation viscosity of the ink is increased; an ion binding is generated by the hydrophobic agent and the oxygen sensitive reactive dye, so that the oxygen sensitive reactive dye has a hydrophobic function; besides, the reducing agent of the variable ink can be substituted by a photocatalyst material and an electron donor material, and the variable ink is an UV activated variable ink; after being radiated by the UV light with proper wavelength, the oxygen sensitive reactive dye is re-activated by a photo electron generated by the photocatalyst material so that the oxygen sensitive reactive dye returns to a reducing state, and therefore, whether an oxidizing reaction is generated can be judged through the color change of the oxygen sensitive reactive dye in reducing state.

Description

technical field [0001] The invention relates to the field of inks, in particular to an oxygen-sensitive color-changing ink and a preparation method thereof. Background technique [0002] Perishable products such as food, beverages and medicines can only obtain the predetermined shelf life in an oxygen-free environment. They are prone to spoilage in an oxygen-free environment. How to determine whether the packaging and sealing degree of perishable products meets the requirements is currently no effective response. means. Therefore, it is necessary to develop an ink that is sensitive to oxygen and apply it to product packaging in a printed form to confirm the degree of sealing of the product, thereby confirming whether the product in the shelf life is spoiled. [0003] In the prior art, there is a smart pigment and a color-changing film. The oxygen-sensitive reactive dye component of the smart pigment can undergo redox reaction with oxygen to change color, and then can be use...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/101C09D11/03C09D11/103
CPCC09D11/50C09D11/03C09D11/101
Inventor 刘永生吴伟军刘文恒曾海明周世兵赵润生吴方奇覃玲魏彪
Owner SHENZHEN NINE STARS PRINTING & PACKAGING GRP
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