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The color changing principle and structure of thermochromic pigments

31 Dec 2022

iSuoChem thermochromic pigments are prepared from electron transfer organic compound systems. Electron-transfer organic compounds are a class of organic chromogenic systems with special chemical structures. At a specific temperature, due to the transfer of electrons, the molecular structure of the organic substance changes, thereby realizing the color change.

This color-changing substance is not only bright in color, but also can realize color change from "colored to colorless" state, which is not available in heavy metal double salt complex type and liquid crystal type reversible thermochromic substances.

Microencapsulated reversible temperature-sensitive color-changing substances are called reversible temperature-sensitive color-changing pigments (commonly known as: Thermochromic pigment, temperature-changing pigments, temperature-sensitive powders or temperature-changing powders).

temperature-changing powders

The particles of this pigment are spherical, with an average diameter of 2 to 7 um (1 um = 1/1000 mm). Its inside is a discoloration(color-changing) substance, and the outside is a transparent shell with a thickness of about 0.2~0.5 um, which can neither dissolve nor melt. It is this that protects the discoloration substance from other chemicals. Therefore, it is very important to avoid damaging this layer of shell during use.

Thermochromic base temperature: 5°C, 10°C, 16°C, 31°C, 33°C, 43°C, 45°C,  50°C,  65°C.

Other customized temperature: -5°C, 0°C, 21°C, 38°C, 70°C, 78°C.

The highest temperature resistance is 200-230 (less than 10 minutes).

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