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A kind of fluorescent/visible light thermochromic material and its preparation method and application

A thermochromic material and visible light technology, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, identification devices, etc., can solve the problems of multiple anti-counterfeiting, encryption, application restrictions, and difficulty in satisfying special fields, and achieve temperature-sensitive response Faster speed, improved sensitivity, and improved productivity

Active Publication Date: 2020-08-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fly in the ointment is that the vast majority of organic thermochromic materials only have thermochromic phenomena in the visible light region, and have a single function, which cannot meet the requirements of multiple anti-counterfeiting and encryption in special fields, and is also difficult to meet the requirements of medical probes, drug release monitoring and other fields. requirements, making its application limited

Method used

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  • A kind of fluorescent/visible light thermochromic material and its preparation method and application
  • A kind of fluorescent/visible light thermochromic material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1 g of rhodamine B and 2 g of octadecylamine were added to a mixed solvent of 15 g of acetone and 5 g of deionized water, after which the mixture was heated to 70 °C and pre-mixed at a speed of 300 rpm for 7 min, and then 0.2 g of 1- (3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.3g of 3-hydroxyl-1,2,3-benzotriazin-4(3H)-one were reacted for 12h, cooled After filtration and evaporation of the solvent, an orange product is obtained;

[0040] 1g of the synthesized orange product was dissolved in isopropanol and purified by chromatographic separation to obtain a modified Rhodamine B compound, which 1 H NMR test results are as follows figure 1 As shown in the figure, it can be found that there are significant absorption peaks at chemical shifts 1.18-1.34 and 3.05-3.15, which are characteristic peaks of hydrogen on the carbon chain of octadecylamine, and chemical shifts are 6.3-6.5, 7.19, and 7.28 , The absorption peaks at 7.4-7.5, 7.8-8.0 are the characte...

Embodiment 2

[0043] Add 1 g of rhodamine B and 1 g of trialkyl tertiary amine to a mixture of 10 g of ethanol and 5 g of deionized water, then heat the mixture to 80 °C and pre-mix at a speed of 560 rpm for 5 min, then add 0.3 g of N, N'-dicyclohexylcarbodiimide reacted with 0.5g of N-hydroxysuccinimide for 36h, filtered after cooling and evaporated the solvent to obtain an orange product;

[0044] 1g of the synthesized orange product was dissolved in ethanol and purified by chromatographic separation to obtain a modified rhodamine B compound, which 1 H NMR test result is substantially identical with embodiment 1;

[0045] Mix 0.8g of the purified product with 20g of stearic acid, 70g of cetyl alcohol and 0.04g of fumed silica at a speed of 540rpm, heat to 70°C and continue stirring for 3h, and obtain a fluorescent / visible light thermochromic material after cooling. The effect before and after heating under ultraviolet light and visible light is basically the same as that of Example 1.

Embodiment 3

[0047] Add 1 g of rhodamine B and 5 g of primary dodecylamine to a mixture of 10 g of methanol and 10 g of deionized water, then heat the mixture to 50 °C and pre-mix at 80 rpm for 7 min, then add 0.8 g of N , N'-diisopropylcarbodiimide and 1.2g of 1-hydroxy-7-azobenzotriazole were reacted for 50h, filtered after cooling and the solvent was evaporated to obtain an orange product;

[0048] 1g of the synthesized orange product was dissolved in acetone and purified by chromatographic separation to obtain a modified rhodamine B compound, which 1 H NMR test result is substantially identical with embodiment 1;

[0049] Mix 0.5g of the purified product with 25g of boric acid, 50g of tetradecyl alcohol and 0.05g of titanium dioxide at a speed of 730rpm, heat to 90°C and continue to stir for 2h, and obtain a fluorescent / visible light thermochromic material after cooling, which can withstand ultraviolet light and visible light The effect before and after lower heating is basically the ...

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Abstract

The invention discloses a thermochromic material to fluorescence or visible light and a preparation method and application thereof. The material refers to the thermochromic material to fluorescence orvisible light, which is prepared by the steps of forming modified rhodamine B compound from rhodamine B and an alkyl amine compound under the effect of a coupling reagent and an activator, and combining the modified rhodamine B compound with an electron acceptor compound and an enhancement agent. The thermochromic material has both thermochromic functions to fluorescence and visible light, and also has the advantages such as fast response to temperature, reversible color changing, cyclic repeat changing color and stable performance. The thermochromic material can be used as new intelligent material having vast application prospect in the field of security, encryption, clothing and medicine.

Description

technical field [0001] The invention relates to a fluorescent / visible light thermochromic material and its preparation method and application, belonging to the technical field of thermochromic materials. Background technique [0002] Thermochromic materials are smart materials that measure and represent the surface temperature and temperature distribution of objects through color changes. According to the properties of thermochromic materials, thermosensitizers can be divided into the following three categories: inorganic, liquid crystal, and organic. Among them, inorganic thermochromic materials are mainly composed of transition metal compounds, and their color changes are mainly caused by changes in crystal form, coordination geometry or number of coordination solvent molecules. These materials have bright and vivid colors, but It has the disadvantages of poor color recovery, high discoloration temperature, poor durability and high toxicity. Liquid crystal thermochromic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/02G09F3/02
CPCC09K9/02C09K2211/1007C09K2211/1088G09F3/02
Inventor 王潮霞张婉殷允杰陈坤林籍晓倩刘雯雯
Owner JIANGNAN UNIV
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