Lanthanide series compound thermo-chromatic material and preparation method thereof

A compound and thermal discoloration technology, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of anti-ultraviolet, poor heat resistance and light resistance, affecting the color change of the compound, and phenolic color developer Toxic and other problems, to achieve the effect of reversibility, good color stability, sharp color change, and low color change temperature

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phenolic color developers are toxic and easily oxidized by air, and have poor UV resistance, heat resistance and light resistance, which affect the color change of the compound

Method used

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  • Lanthanide series compound thermo-chromatic material and preparation method thereof
  • Lanthanide series compound thermo-chromatic material and preparation method thereof
  • Lanthanide series compound thermo-chromatic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 30g of stearyl alcohol in a three-necked flask, heat and melt; weigh 0.3g of bromocresol violet and 0.3g of lanthanum nitrate, add them to the three-necked flask, stir fully to dissolve, and slowly raise the temperature to 130°C, constant temperature reaction 2.5 hour; cool the resulting product, wash twice with absolute ethanol and acetone, and filter under reduced pressure; dry at 35°C for 5 hours to obtain bromocresol purple-La 3+ - Octadecanol (mass ratio 1:1:100) thermochromic compound.

Embodiment 2

[0022] Replace lanthanum nitrate with cerium nitrate, and all the other steps are the same as in Example 1 to obtain bromocresol purple-Ce 3+ - Octadecanol (mass ratio 1:1:100) thermochromic compound.

Embodiment 3

[0024] Replace lanthanum nitrate with neodymium nitrate, and all the other steps are the same as in Example 1 to obtain bromocresol purple-Nd 3+ - Octadecanol (mass ratio 1:1:100) thermochromic compound.

[0025] Carry out DSC analysis to it, as shown in the accompanying drawing. During the heating process, an obvious color-changing peak appeared at 60°C; during the cooling process, the sample began to condense at 54°C, and the obtained results were basically consistent with the data of the visual method. The endothermic enthalpy of heating up becomes 102.3J / g, and the exothermic enthalpy of cooling down becomes 101.7J / g, which further proves the reversibility of its discoloration.

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Abstract

The invention discloses a lanthanide series compound thermo-chromatic material and a preparation method thereof, and belongs to the technical field of inorganic and organic composite functional materials. The compound consists of lanthanide series metal ions (color development agent), bromcresol purple (color former and complexing agent) and solvent; and the color of the system is changed from brown to yellow (or yellow green) together with temperature rise and can be recovered after cooling. The lanthanide series compound thermo-chromatic material in a quinoid conjugated system form is prepared under a curing solvent environment; the preparation method is simple; and the material has low color change temperature (53 to 57 DEG C) and good color change sensitivity, reversibility and stability, and is an ideal low-temperature reversible thermo-chromatic material. Alkaline earth or transition metal ions are substituted by adopting lanthanide series metal ions, so that the anti-oxidation and anti-ultraviolet properties of the material are kept, and the heat resistance and the light resistance of the material are also obviously improved. By considering the condition that rare earth is rich in China, the industrialized production of the material has important practical significance and economic value.

Description

technical field [0001] The invention belongs to the technical field of inorganic-organic composite functional materials, in particular, it provides a new lanthanide compound thermochromic material and a preparation method thereof. Background technique [0002] Thermochromic materials, as a new type of functional material whose color can change with the ambient temperature, have extremely broad application prospects. Early research was mainly used for reversible thermochromic coatings, and in recent years it has gradually turned to the research of organic reversible thermochromic compounds. This kind of material is generally composed of chromogenic agent (electron donor), chromogenic agent (electron acceptor) and solvent (melting compound). It is characterized by the color change temperature and color can be selected, the preparation process is simple, and it is most likely to be used in anti-counterfeiting and national defense construction. [0003] The research on organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/02
Inventor 傅成武陈明清倪忠斌东为富段芳耿娜
Owner JIANGNAN UNIV
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