Chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and preparation method thereof

A three-color, chiral technology, applied in the field of optical materials, can solve the problems of fluorescent anti-counterfeiting pattern cloning, etc., and achieve the effect of easy industrial production, short preparation route and mild reaction conditions

Active Publication Date: 2021-07-23
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the fluorescent compound is disclosed, the fluorescent anti-counterfeiting pattern still has the risk of being cloned

Method used

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  • Chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and preparation method thereof
  • Chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and preparation method thereof
  • Chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A chiral fluorescent liquid crystal with dual anti-counterfeiting mechanism with three primary colors at room temperature, its structural formula is as follows:

[0047]

[0048] The preparation method is as follows:

[0049] (1) Raw materials: undecylenyl chloride, pyrenemethanol, triethylamine, methanol, tetrahydrofuran, chiral liquid crystal monomers containing double bonds and chiral mesogens 1: cholesteryl allyloxybenzoate, containing Liquid crystal monomer 2 with double bonds and rod-like fluorine-containing mesogens: 3,4-difluorophenylbicyclohexylbutene, polymethylhydrogensiloxane (PMHS): about 3 active hydrogens, catalyst: Hexachloroplatinic Acid.

[0050] (2) Preparation of double bond-containing fluorescent monomer 3:

[0051] Weigh pyrenemethanol (1.5g, 6.46mmol) and dissolve it in 15mL tetrahydrofuran, transfer this solution into a 100mL single-necked flask, add a small amount of triethylamine as an acid absorbing agent, weigh undecylenoyl chloride (1.3...

Embodiment 2

[0062] A chiral fluorescent liquid crystal with dual anti-counterfeiting mechanism with three primary colors at room temperature, its structural formula is as follows:

[0063]

[0064] The preparation method is as follows:

[0065] (1) Raw materials: undecylenyl chloride, pyrenemethanol, triethylamine, methanol, tetrahydrofuran, chiral liquid crystal monomers containing double bonds and chiral mesogens 1: cholesteryl allyloxybenzoate, containing Liquid crystal monomer 2 with double bonds and rod-like fluorine-containing mesogens: 3,4-difluorophenylbicyclohexylbutene, polymethylhydrogensiloxane (PMHS): about 3 active hydrogens, catalyst: Hexachloroplatinic Acid.

[0066] (2) Preparation of double bond-containing fluorescent monomer 3:

[0067] Weigh pyrenemethanol (1.5g, 6.46mmol) and dissolve it in 15mL tetrahydrofuran, transfer this solution into a 100mL single-necked flask, add a small amount of triethylamine as an acid absorbing agent, weigh undecylenoyl chloride (1.3...

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Abstract

The invention discloses a chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and a preparation method thereof. The chiral fluorescent liquid crystal is constructed by grafting and copolymerizing a chiral liquid crystal monomer, a nematic fluorine-containing liquid crystal monomer, a fluorescent monomer and polymethylhydrosiloxane. The structure of the chiral fluorescent liquid crystal is shown as a formula I which is described in the specification. According to the invention, at a room temperature (0-25 DEG C) and under visible light of a bright field, a color reflected by the chiral fluorescent liquid crystal is gradually changed from red to green along with the change of an angle between a sight line and a planar film of the chiral fluorescent liquid crystal from 90-30 degrees due to Bragg selective reflection of the chiral fluorescent liquid crystal; and in a dark field and under the irradiation of ultraviolet light with a length of 310 nm, the chiral fluorescent liquid crystal can emit blue characteristic fluorescence. The chiral fluorescent liquid crystal prepared by the invention can realize three primary colors, namely red, green and blue in a room temperature range (0-25 DEG C), and has wide application prospects in an anti-counterfeiting field.

Description

technical field [0001] The invention relates to a double anti-counterfeiting mechanism chiral fluorescent liquid crystal with three primary colors at room temperature and a preparation method thereof, belonging to the technical field of optical materials. Background technique [0002] Counterfeiting is a worldwide problem with extremely serious implications for the economy, human health, and national security. At present, anti-counterfeiting technology has been widely used in medicine, currency, electronic products, certificates, jewelry and other fields. Stimuli-responsive materials can be made into graphic-encoded anti-counterfeiting markers due to their high encoding capacity. Among various anti-counterfeiting materials, fluorescent materials are widely used in the field of anti-counterfeiting due to their easily detectable chemical properties, and play an important role in anti-counterfeiting. However, once the fluorescent compound is disclosed, the fluorescent anti-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07J51/00C09K11/06C09K19/36
CPCC07J51/00C09K11/06C09K19/36C09K2211/1007C09K2211/1011
Inventor 么冰赵国峰吴昊莫晨曦孟子杰刘浩经涛
Owner XUZHOU UNIV OF TECH
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