Low-temperature reversible thermochromic material and preparation method and application thereof

A thermochromic material, a low-temperature solvothermal technology, which is applied in the fields of color-changing fluorescent materials, chemical instruments and methods, and color/spectral property measurement, etc. and other problems, to achieve the effect of bright color, sharp color change, and short recolor time.

Inactive Publication Date: 2015-07-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, at present, due to the small color difference of inorganic reversible thermochromic materials, and the limitation of use conditions, heating time and speed, the accuracy of thermochromic display is not very high. limit

Method used

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  • Low-temperature reversible thermochromic material and preparation method and application thereof
  • Low-temperature reversible thermochromic material and preparation method and application thereof
  • Low-temperature reversible thermochromic material and preparation method and application thereof

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preparation example Construction

[0025] The preparation method of the low-temperature reversible thermochromic material is as follows: a low-temperature solvothermal method is used to prepare the thermochromic material. In terms of molar ratio, nickel powder: iodine simple substance=1.0-2.0:0.8-1.5, ammonia water 3.0-6.0 mL is used as the reactant, Put it into a 25 mL reactor and place it at 120-180°C for 4-7 days to react, and wash it with distilled water and ethanol respectively to obtain a low-temperature reversible thermochromic material.

[0026] The color change principle of the low-temperature reversible thermochromic material is the gain and loss of crystal water, which can be used to detect water.

[0027] The prepared low-temperature reversible thermochromic material is tested for composition formula determination, color-changing temperature range, color, recolor time, color-changing sensitivity, heat resistance and other comprehensive color-changing performance tests; the low-temperature reversible ...

Embodiment 1

[0030] Weigh Ni 1.0 mmol (0.059 g), I 2 0.8 mmol (0.203 g), measure NH 3 ·H 2 O 3.0 mL, put it into a 25 mL reactor, and turn it over at 120 °C for 7 days and then cool naturally. The product was washed several times with distilled water and ethanol respectively to prepare a low-temperature reversible thermochromic material.

Embodiment 2

[0032] Add Ni 1.5 mmol (0.089 g), I 2 1.2 mmol (0.305 g) and NH 3 ·H 2 The consumption of O 5.0 mL, raising temperature to 150 ℃, shortening reaction time is 5 days, all the other steps are with embodiment 1.

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Abstract

The invention discloses a low-temperature reversible thermochromic material and a preparation method and application thereof. The molecular formula of the thermochromic material is (Ni(NH3)6)I2.0.5H2O. The thermochromic material is prepared by adopting a low-temperature solvent-thermal method, and the specific preparation method is as follows: nickel powder: iodine elementary substance equal to (1.0-2.0): (0.8-1.5) according to molar ratio, 3.0-6.0mL of ammonia water is taken as a reactant, raw materials are loaded into a 25mL reaction kettle and placed at the temperature of 120-180 DEG C for reacting for 4-7 days, and then distilled water and ethanol are respectively used for washing. The thermochromic material is prepared. The discoloration principle is that gain and loss of crystal water can be used for detecting water. The thermochromic material disclosed by the invention has the advantages that the thermochromic material is prepared by adopting the one-step solvent-thermal method, the process flow is simple, the yield is high, the environmental pollution is little, the production cost is low, and the prepared thermochromic material has low discoloration temperature, short color recovery time, bright color and luster, sharp discoloration and good reversibility.

Description

technical field [0001] The invention relates to a low-temperature reversible thermochromic material, a preparation method and application thereof, and belongs to the field of thermal functional materials. Background technique [0002] Thermochromic materials refer to functional materials whose visible absorption spectrum changes when some compounds or mixtures are heated or cooled. It has the characteristic of changing color with temperature. This material is a thermal memory functional material, which is widely used in various fields such as industry, textile, military, printing, medical care, diagnosis, construction, anti-counterfeiting marks, daily decoration, aerospace and so on. Thermochromic materials can be divided into two categories: irreversible thermochromic materials and reversible thermochromic materials. Reversible thermochromic material means that when the material is heated to a certain temperature or temperature range, its color will change obviously, showi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00C01G53/12G01N21/29
Inventor 刘毅沈亚英刘畅候佩佩
Owner ZHEJIANG UNIV
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