How does Thermochromic Material Temperature Affect Its Color?

From:Linshang Time:2020/06/02 11:00:00 Browse:140

Thermochromic materials will change in color with changes in temperature, so how do we detect the degree of color change?

1. What is thermochromic material?

Some time ago, a cup that changed color was very popular. When the cup was poured with hot water, it would appear completely different. There are obvious color differences before and after the color change. Through this difference, different appearances can be designed to make the appearance of the cup more unique.

thermochromic cups

Simply put, thermochromic materials are special materials whose color changes with temperature in a certain temperature range. The color can change from colorless to colored; from colored to colorless; there are also multi-color materials that appear two or more colors in succession after being heated.

However, in the actual production process, in order to make the color change within a controllable range, we need to use a professional colorimeter to detect the color of the thermochromic material at different temperatures.

2. The effect of temperature on color

In fact, not only the color of thermochromic materials will be affected by temperature. But in fact, most materials in life will change color with the change of temperature. Some materials have obvious changes and some materials have a color shift that we can't perceive of. For example, a ceramic tile only needs a temperature change of 15 degrees Celsius to measure excellent difference, while printed products on corrugated cardboard may require a larger temperature change to cause color difference. We call this color change caused by temperature change collectively called thermochromism.

In order to grasp the color difference caused by the temperature change of the product, we can measure the color difference value of the object at different temperatures through a professional colorimeter.

First, we can create a color standard at room temperature by measuring with a colorimeter. Then put the sample in the refrigerator and let the temperature reach 35 degrees Fahrenheit. Then measure it every few minutes by a colorimeter and a thermometer. Record the color data and temperature values respectively. Compare the color difference between the sample and room temperature at different temperatures to see the difference in color due to temperature.

From dyes to ceramics to plastics, most materials and colors are volatile. How to control the color differences caused by temperature changes is a challenge that various manufacturers need to face.

3. How to detect color of thermochromic materials?

The thermochromic materials of the artifact have been applied in various scenes in life. They will make the product more vibrant and stimulate people's desire to buy. However, in the preparation and application of thermochromic materials, how to control the color change is the key.

The colorimeter is an optical measuring instrument that simulates the human eye's sensing of red, green and blue light. It is mainly based on the Lab and Lch principle of the CIE color space. The measurement shows the color difference △ E and △ Lab value of the sample and the measured sample and the sample can be measured. The reflection chromaticity, absorption rate, brightness, various color values and so on.

The high-quality colorimeter can accurately analyze and transfer the color of thermochromic materials under the D8 geometric optical illumination recommended by CIE. Under multiple color spaces, various color difference formulas and color indexes can be accurately measured and expressed. Users can record color data at different temperatures through a colorimeter to achieve accurate color transfer. It can also be used as a detection device for a precise color matching system.

By performing color detection on thermochromic materials at different temperatures and comparing the degree of color difference, it is possible to reasonably adjust the color of the thermochromic materials, so that the appearance color of the product reaches the desired standard.

Tags: colorimeter
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