Introduction to the classification principle of thermochromic paint

Most of the products around us are classified according to color or specifications, but the performance characteristics of thermochromic paints explained today are more prominent, and the performance effects are more characteristic, because they can change colors according to different temperatures. . For example, in places where the temperature difference between day and night is large, or where the requirements for personalization are more stringent, you can find that thermochromic paint can have a decorative effect. For example, some tea cups use this type of paint products. According to the interior The temperature of the liquid can exhibit different effects.
What is a thermochromic paint?
Color-changing paint (belonging to spray-type color-changing ink) is a special paint that changes color with the help of other substances. Basic colors: black, royal blue, dark blue, aqua blue, scarlet, scarlet, rose red, orange red, golden, grass green, peacock green, dark green, etc. (can be toned). Basic temperature: -5 °C, 0 °C, 5 °C, 10°C, 16°C, 21°C, 31°C, 33°C, 38°C, 43°C, 45 °C, 50°C, 65 °C, 70 °C, 78 °C. Color-changing paint is suitable for various surface coating products, including PMMA spray paint, ABS spray paint, PVC spray paint, etc. There are self-drying and baking-drying methods, which can be diluted with the corresponding diluent when used, or water-based paint can be customized and diluted with water.
Classification
Color-changing paint can be divided into photosensitive color-changing paint and temperature-sensitive color-changing paint. Photochromic paint is a kind of paint containing photochromic microcapsules that is excited by ultraviolet rays to produce a color. It is mostly used for toys, gifts, textiles, and jewelry. Thermochromic paints are paints that can change color with temperature. They contain microcapsules wrapped with compounds that can change color when exposed to heat.
Discoloration paint is divided into reversible discoloration paint and irreversible discoloration paint according to reversibility. Reversible color-changing paint: when the temperature drops back to its original color, the pigment contained is iodide. Irreversible color-changing paint: When the temperature drops back, the original color cannot be restored. The pigments include chromium, iron, potassium, sodium, calcium, aluminum and other nitrates, sulfates, chlorides, etc. Brush on motors, bearings, boilers and other equipment to indicate temperature and ensure safety.
Third, the principle
Photochromic paint is irradiated by ultraviolet or sunlight. After absorbing ultraviolet or sunlight, the color changes. When it loses ultraviolet or sunlight, it will return to its original color. The principle is to use the energy of UVA to open the light-sensitive molecular bond, making it jump from a low energy level to a high energy level. That is, it jumps from invisible light to visible light, which changes the color.
The principle of thermochromic paint is to control the change of color by using the difference in temperature. At a certain pressure and temperature, due to the thermal separation, water vapor, ammonia, and carbon dioxide are liberated, which changes the composition and structure of the original substance, forms a new substance, and presents a new color.
The temperature-sensitive color-changing paints for everyone’s example above are not single in color, because according to temperature changes, their external appearance characteristics can also show a variety of performances, so we can see similar products in some special places. For example, the outside of the tea cup is coated with thermochromic paint. Then according to the change of the internal water temperature, different effects can be presented. In this way, we can know the temperature of the liquid just by observing it. This is exactly its humane quality. When you buy it, you can combine the above to understand the product. Classification and principles, from which to choose.