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Fluorescent material and preparation method and application thereof

A fluorescent material and fluorescent technology, applied in the field of organic fluorescent materials, can solve problems such as difficult to use, single color change, etc.

Active Publication Date: 2019-01-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the reported photofluorochromic materials are mainly based on the fluorescence spectrum changes before and after the photoisomerization reaction process of conjugated photochromic molecules. Difficult to make better use of

Method used

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  • Fluorescent material and preparation method and application thereof
  • Fluorescent material and preparation method and application thereof
  • Fluorescent material and preparation method and application thereof

Examples

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Effect test

preparation example 1

[0069] Preparation of Red Fluorescent Modified Polysaccharide and Its Derivative CA-SP

[0070] 2.70g cellulose acetate (CA 2.55 ) and 0.19g SPCOOH were dissolved with 80mL N,N-dimethylformamide (DMF), then 2.06g dicyclohexylcarbodiimide (DCC) and 1.21g 4-dimethylaminopyridine (DMAP ) as a catalyst. The mixed solution was refluxed at 155°C for 3 hours and then stopped, then the mixed solution was poured into deionized water for precipitation, dried and dissolved with DMF, and then deionized water was used for precipitation, and this was repeated 2-3 times, and finally the filter cake After lyophilization, 2.9 g of CA-SP was obtained as a dark red powder with a yield of 88%.

[0071] The CA-SP is a modified ester of cellulose acetate followed by spiropyran, and the degree of substitution of spiropyran is 0.07.

preparation example 2

[0073] Preparation of Red Fluorescent Modified Polysaccharide and Its Derivative CA-SP'

[0074] 2.70g cellulose acetate (CA 2.55 ) and 0.048g SPCOOH were dissolved with 80mL N,N-dimethylformamide (DMF), then 2.06g dicyclohexylcarbodiimide (DCC) and 1.21g 4-dimethylaminopyridine (DMAP ) as a catalyst. The mixed solution was refluxed at 155°C for 3 hours and then stopped, then the mixed solution was poured into deionized water for precipitation, dried and dissolved with DMF, and then deionized water was used for precipitation, and this was repeated 2-3 times, and finally the filter cake After lyophilization, 2.9 g of dark red powder CA-SP' was obtained, with a yield of 88%.

[0075] The CA-SP' is a modified ester of cellulose acetate followed by spiropyran, and the degree of substitution of spiropyran is 0.02.

preparation example 3

[0077] Preparation of Green Fluorescent Modified Polysaccharide and Its Derivative CA-FITC

[0078] 3.0g cellulose acetate (CA 2.55 ) into a 250mL round-bottomed Schlenk reaction flask, operated anhydrous and anaerobic (inflated with nitrogen after vacuuming) three times, and pipetted 60mL of anhydrous DMF ( Molecular Preservation) dissolves. Add 0.1298g of fluorescein isothiocyanate (FITC) into a 100mL Schlenk tube for three anaerobic operation with water, then pipette 20mL of anhydrous DMF for dissolution. The dissolved FITC solution was transferred to the CA solution, 50 μL of dibutyltin dilaurate (DBTDL) was added, and the mixed solution was reacted at 100° C. for 4 h to stop the reaction. The reactant was directly poured into methanol for precipitation, the filter cake was rinsed with a small amount of ether, dried and then dissolved in DMF, poured into deionized water for precipitation, filtered, and freeze-dried to obtain 2.80 g of CA-FITC as a light yellow powder. ...

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Abstract

The invention discloses a fluorescent material. The fluorescent material with adjustable RGB values and / or adjustable color or even polysaccharide-based dynamic full-color fluorescent properties can be obtained by controlling the ratio of three-primary-color fluorescent modified polysaccharide and derivatives thereof and can gradually change in color under the excitation of ultraviolet light as the ultraviolet light excitation time is prolonged. Since in the fluorescent material, the substitution degree of fluorophores is low, the fluorescent material can maintain the excellent properties of polysaccharide and polysaccharide derivatives, such as mechanical properties, solubility properties and processing properties, and different types of fluorescent materials such as fluorescent coatings,fluorescent electrospun membranes, fluorescent fibers, fluorescent micelles and fluorescent ink can be processed very easily. The fluorescent ink has good film forming properties and can be printed on the surfaces of different base materials such as paper, plastic and metal. Therefore, the fluorescent material has very important practical value in the fields of safe printing, certificate counterfeiting and the like.

Description

technical field [0001] The invention relates to a fluorescent material and its preparation method and application, belonging to the field of organic fluorescent materials. Background technique [0002] Color-changing materials are special materials whose color or absorption spectrum changes with environmental stimuli. According to the types of environmental stimuli or the principle of discoloration, common color-changing materials can be divided into photochromism, electrochromism, solvatochromism, thermochromism, acid-induced discoloration, force-induced discoloration, friction discoloration, ionization discoloration, etc. Wait. Among the many color-changing materials, photochromic materials are the most common. This kind of material can realize the color change by controlling the light conditions. It has many advantages such as simple regulation, fast response speed, and obvious color change contrast, so it is widely used. Coatings, cosmetics, textile printing and dyeing...

Claims

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Application Information

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IPC IPC(8): C09K11/06C08L1/14C09D101/14C09D5/22G09F3/02
Inventor 张军田卫国张金明
Owner INST OF CHEM CHINESE ACAD OF SCI
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