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Color-changing paints can be divided into two types. There are photosensitive discoloration and temperature-sensitive discoloration. Most of them are used on some mechanical products. Color-changing paints can bring innovations to our senses, but many people do not understand color-changing paints. Let's take a look at the related introduction of color paint .
Color paint classification
The classification of color-changing paints can be classified into reversible color-changing paints and irreversible color-changing paints according to reversibility.
Reversible color change paint : When the temperature drops back to restore the original color, the pigment is iodide.
Irreversible color change paint: When the temperature drops back, it cannot restore the original color. The pigment contained is nitrate, sulfate, chloride, etc. of chromium, iron, potassium, sodium, calcium, aluminum and so on. Brush on motors, bearings, boilers, etc. to indicate temperature and ensure safety.
Color change paint principle
The type of photosensitive discoloration of color-changing paints is the change of color after ultraviolet rays and sunlight, absorption of ultraviolet rays or sunlight, and when the ultraviolet rays or sunlight is lost, it is restored to the original color. The principle is to make use of the energy of UVA to open the bond of photosensitive molecules to make it jump from low energy level to high energy level. That is, jumping from invisible light to visible light produces a change in color.
The type of thermochromic color change paint, paint principle is the use of temperature differences to control the color change. Under certain pressures and temperatures, the heat breaks out of water vapor, ammonia, and carbon dioxide, changing the composition and structure of the original material, forming new substances, and presenting new colors.
Discoloration paint considerations
(1) Substrate Selection The most suitable material is the material with a pH of 7 to 9.
(2) The photofabricated light-induced fatigue of the photochromic paint is caused by excessive exposure to ultraviolet light (UV light) and high humidity, and it is recommended to add a light absorber and an antioxidant to increase light fatigue resistance.
(3) Additives used for photochromic paints (antioxidants, heat stabilizers, UV light absorbers, and suppression can improve light fatigue resistance, but the ratio of additives depends on the medium used, and the wrong ratio It will accelerate the occurrence of light fatigue.
(4) Color paint should be sealed and stored in a closed, dry, dark place, away from direct sunlight.
(5) The thermochromic paint has slight irritation to the respiratory tract of the skin and should be sealed during handling. The environment during the spraying operation should maintain good ventilation. After the paint is completely dry, there will be no odor or irritation, and it meets the safety toy and food packaging specifications.
The above is the relevant knowledge of color paint for everyone. Interested friends can take a look at the above introduction and learn more about color paint.
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