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Azobenzene-contained microcapsule-type liquid crystal and application thereof in light-controlled liquid-crystal falsification-resistant ink

An anti-counterfeiting ink, azobenzene technology, applied in the field of ink, can solve the problems of complex operation method, short service life, poor stability of microcapsule ink, etc., and achieve the effect of wide application prospect, long service life and good stability

Active Publication Date: 2015-08-26
FOSHAN SOUTHERN PACKAGING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no chemical bond between this traditional microcapsule and the core material, only a protective shell is formed. The microcapsule ink has the disadvantage of poor stability and short service life; in addition, most of the anti-counterfeiting liquid crystals currently used in the market Ink, the operation method in anti-counterfeiting identification is complicated; therefore, it is urgent to find a liquid crystal anti-counterfeiting ink with good stability, reversibility, and simple operation method in anti-counterfeiting identification

Method used

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  • Azobenzene-contained microcapsule-type liquid crystal and application thereof in light-controlled liquid-crystal falsification-resistant ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Preparation of mesogen

[0065] a. Take 2.55g of 20% dilute hydrochloric acid and add it to the reaction flask, and cool it in an ice-water bath; weigh 3.46g of p-aminobenzenesulfonic acid and 1.38g of sodium nitrite, add an appropriate amount of water to make a paste, and then make the paste The solid was added into a reaction flask filled with hydrochloric acid, and after stirring for 20 minutes, a diazonium salt solution was obtained. Add 1.88g of phenol, 50mL of water and 0.8g of sodium hydroxide into another reaction flask, stir to dissolve, place in an ice-water bath to control the temperature at 0-5°C, add the diazonium salt solution prepared above, and stir for 10min-15min. After the reaction, dilute hydrochloric acid was added to adjust the pH of the solution to 5-6, filtered, precipitated, recrystallized with ethanol, and vacuum-dried at 50°C to obtain an earthy red powder.

[0066] b. 2.54g of the above earth red powder, 24.4g of 1,6-dibromohexane, 10g o...

Embodiment 2

[0083] (1) Preparation of mesogen

[0084] a. Take 2.55g of 20% dilute hydrochloric acid and add it into the reaction flask, and cool it in an ice-water bath; weigh 3.46g of p-aminobenzenesulfonic acid and 1.38g of sodium nitrite, add an appropriate amount of water to make a paste, and then make the paste The substance was added into a reaction flask filled with hydrochloric acid, and after stirring for 20 minutes, a diazonium salt solution was obtained. Add 1.88g of phenol, 50mL of water and 0.8g of sodium hydroxide into another reaction flask, stir to dissolve, place in an ice-water bath to control the temperature at 0-5°C, add the diazonium salt solution prepared above, and stir for 10min-15min. After the reaction, dilute hydrochloric acid was added to adjust the pH of the solution to 5-6, filtered, precipitated, recrystallized with ethanol, and vacuum-dried at 50°C to obtain an earthy red powder.

[0085] b. 2.54g of the above earth red powder, 24.4g of 1,6-dibromohexane,...

Embodiment 3

[0103] (1) Preparation of mesogen

[0104] a. Add 2.76g of p-hydroxybenzoic acid, 0.8g of sodium hydroxide, and 50mL of deionized water into a three-necked flask, dissolve them under stirring, raise the temperature to 78-82°C, add 0.1g of KI to catalyze the reaction, and add dropwise 6-chloro-1- Hexanol 5mL, reaction 20h. Dilute with water, add hydrochloric acid dropwise to cool and precipitate a white milky substance, adjust the pH value to 5 to obtain a large amount of white precipitate, filter with suction, recrystallize the filter cake with deionized water for 3 times, and dry at 100°C to obtain a white powder.

[0105] b. Add 3.64g of the above white powder crystals, 50mL of benzene, and 20mL of acrylic acid into a three-neck flask, heat to 87-90°C with stirring, and reflux for 15h. Most of the benzene was evaporated with a rotary evaporator, the solid was precipitated in an ice bath, filtered with suction, the filter cake was recrystallized twice with isopropanol, and v...

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Abstract

The invention relates to an azobenzene-contained microcapsule-type liquid crystal and application thereof in light-controlled liquid-crystal falsification-resistant ink. According to the invention, the microcapsule-type liquid crystal uses azobenzene-contained liquid-crystal unit as a core material and polyurea as a wall material, wherein the core material and the wall material are connected together through polysiloxane; and the light-controlled liquid-crystal falsification-resistant ink is composed of the following substances by weight: 20 to 25 parts of the above-mentioned azobenzene-contained microcapsule-type liquid crystal, 25 to 30 parts of a polyurethane binder, 25 to 28 parts of isopropanol, 26 to 38 propyl, 0.8 to 1.2 parts of a dispersant and 0.8 to 1.2 parts of polyethylene wax. The light-controlled liquid-crystal falsification-resistant ink prepared by using the azobenzene-contained microcapsule-type liquid crystal as a raw material in the invention has good storage stability; and the printing products of the ink have significant metachromatism under the irradiation of 330 to 380 nm of ultraviolet light, so identification is easy and use is convenient.

Description

technical field [0001] The invention relates to the field of inks, in particular to a microcapsule liquid crystal containing azobenzene and its application in light-controlled liquid crystal anti-counterfeiting ink. Background technique [0002] It is an indisputable fact that China's current commodity quality situation is grim. From luxury goods and so-called famous products to daily necessities, there are almost no commodities that are not violated by fakes. However, there are many problems in China's current anti-counterfeiting market technology, rules, and standards. The current status of the anti-counterfeiting technology market can be summarized in nine words: "fake anti-counterfeiting, no anti-counterfeiting, difficult anti-counterfeiting". Among them, the traditional anti-counterfeiting technology is backward, and the lack of uniqueness and exclusivity of anti-counterfeiting technology is one of the important reasons. For example, "laser anti-counterfeiting" has bee...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/102C09D11/033C09D11/03C08G18/64B01J13/14
Inventor 彭斯敏刘长来王小妹林灿洪
Owner FOSHAN SOUTHERN PACKAGING
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