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Reversible thermochromism material and preparation method thereof

A technology of thermochromic materials and raw materials, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of environmental pollution and high toxicity, and achieve the effects of less environmental pollution, less pollution and low production cost.

Inactive Publication Date: 2012-12-19
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the electron donor and electron acceptor compounds currently used are relatively toxic and pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A reversible thermochromic material A, calculated in parts by weight, its raw material composition and content are as follows:

[0031] Electron donor compound 0.25 parts

[0032] Electron acceptor compound 350 parts

[0033] Solvent 100 parts

[0034] The electron donor compound is rhodamine B;

[0035] The electron acceptor compound is boric acid;

[0036] Described solvent is oxalic acid.

[0037] The preparation method of above-mentioned a kind of reversible thermochromic material A, specifically as follows:

[0038] Put rhodamine, oxalic acid, and boric acid into a mortar and mix to obtain a mixture, and then grind until the color and phase of the mixture are uniform, and the reversible thermochromic material A is obtained in about 1 hour.

Embodiment 2

[0040] A reversible thermochromic material B, calculated in parts by weight, its raw material composition and content are as follows:

[0041] Electron donor compound 0.5 part

[0042] Electron acceptor compound 350 parts

[0043] Solvent 100 parts

[0044] The electron donor compound is rhodamine B;

[0045] The electron acceptor compound is boric acid;

[0046] Described solvent is oxalic acid.

[0047] The preparation method of the above-mentioned reversible thermochromic material B, the steps are as follows:

[0048] Put rhodamine, oxalic acid, and boric acid into a mortar and mix to obtain a mixture, and then grind until the color and phase of the mixture are uniform, and the reversible thermochromic material B is obtained in about 1 hour.

Embodiment 3

[0050] A reversible thermochromic material C, calculated in parts by weight, its raw material composition and content are as follows:

[0051] Electron donor compound 1 part

[0052] Electron acceptor compound 350 parts

[0053] Solvent 100 parts

[0054] The electron donor compound is rhodamine B;

[0055] The electron acceptor compound is boric acid;

[0056] Described solvent is oxalic acid.

[0057] The preparation method of the above-mentioned reversible thermochromic material C, the steps are as follows:

[0058] Put rhodamine, oxalic acid, and boric acid into a mortar and mix to obtain a mixture, and then grind until the color and phase of the mixture are uniform, and the reversible thermochromic material C is obtained respectively for about 1 hour.

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Abstract

The invention discloses a reversible thermochromism material, consisting of the following raw materials in parts by weight: 0.25-8 parts of electron donor compounds, 350-400 parts of electron acceptor compounds and 100 parts of solvent, wherein the electron donor compound is rhodamine B, bromcresol purple or a mixture of the rhodamine B and the bromcresol purple; the electron acceptor compound is boric acid; and the solvent is oxalic acid, tetradecyl alcohol or a mixture of the oxalic acid and the tetradecyl alcohol. A preparation method of the reversible thermochromism material comprises the following steps of: mixing the electron donor compounds, the electron acceptor compounds and the solvent, and grinding the raw materials to have homogeneous colors and phase states, thus obtaining the reversible thermochromism material. The reversible thermochromism material has the characteristics of small environment pollution and low production cost. The adjustment on the color-change temperature of the reversible thermochromism material and the control on the color-recovering time of the reversible thermochromism material can be realized by changing the types of the electron donor compounds and the solvent, the proportion and the reaction temperature of the electron donor compounds, the electron acceptor compounds and the solvents, etc.

Description

technical field [0001] The invention relates to a reversible thermochromic material and a preparation method thereof Background technique [0002] Thermochromic materials refer to functional materials whose color changes significantly with the change of temperature within a certain temperature range, and have attracted widespread attention in both basic preparation and practical applications. At present, thermochromic materials have been widely used in many fields including food packaging, textile industry, plastic products and so on. At present, thermochromic materials can be divided into inorganic, organic, liquid crystal, polymer and biological macromolecules and other types. [0003] Patent ZL 01823268 describes a thermochromic material prepared from inorganic metal oxides. Its main discoloration temperature is 200-400°C, and the elements used are mostly heavy metal compounds such as cadmium and mercury, which are harmful to the environment. Patent CN1546603 uses neut...

Claims

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Application Information

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IPC IPC(8): C09K9/02
Inventor 李向清俞洁张太阳康诗钊穆劲
Owner SHANGHAI INST OF TECH
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