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Principle of color changing mug

Oct. 09, 2019

People often get used to calling a coffee drinking cup with handle as a mug. There is a ceramic mug whose appearance is black, red, green or other colors, but when pouring hot water into the cup, from the bottom to the top, the original color of the cup will gradually fade away, and a special pattern appears. After a few minutes, the pattern became clear. If the water in the cup is cool, the pattern on the cup will gradually disappear, revealing the original color of the cup. This is how it happened?

It turns out that this kind of color-changing mug has a temperature-sensitive coating made of heat-sensitive material than the ordinary cup. Thermally sensitive materials, also known as thermochromic materials, change their color from colored to colorless, or from colorless to colored, depending on temperature, and can change from one color to another. For example, full white sublimation mug is a kind of color changing mug. A common thermochromic material is composed of an electron donor (chromogen), an electron acceptor (developer), and a solvent. The developer accepts the electrons provided by the color former to produce a color reaction, and the solvent determines the color change temperature of the material. The color formers include triarylmethane phenols and fluoran compounds, and the color developing agents are mainly phenolic hydroxyl compounds and derivatives thereof, and most of the solvents are alcohols (such as n-hexadecanol). When the temperature rises, the electrons in the atom are transferred, causing the molecular structure of the organic substance to change, thereby realizing the color change. This reaction is reversible. When the original temperature is restored, the structure of the material molecules is restored to its original state, and its color is restored to its original color.

The production of sublimation ceramic mug is very convenient. The thermochromic material is ground into 3 to 10 micron particles, and the water-based paint is applied to an ordinary ceramic cup, then placed in an oven, and baked at a high temperature of about 320 ° C to remove moisture and binder. The thermochromic material is cured on the ceramic cup. Then enter the picture or photo to be "printed" on the cup into the computer, and then use a special "printer" on a piece of thermal transfer paper. Thermal transfer can print the pattern on various materials. The specific method is to print the pattern on the transfer paper with special transfer ink, and then put it on the thermochromic coating on the outer surface of the cup and put it into the oven. The heat transfer treatment was carried out at a temperature of about 220 °C. After a few minutes, the pictures or photos on the transfer paper were printed on the cup, and a special color-changing mug was made. When the cup is added to the hot water, the thermochromic coating becomes colorless and transparent, and a beautiful picture appears.

SM001-Full White Sublimation Mug-12OZ

Temperature sensing materials were first extracted from plants. In order to obtain more kinds of colors and higher yields, scientists have synthesized a large number of temperature sensing materials. Different temperature sensing materials have different sensitivity ranges to temperature, so color changing cups made of different materials have different colors depending on temperature.

The color-changing mug is only processed on it. When hot water or warm water is poured into the cup, the pattern outside the cup will be discolored according to the temperature, also known as the ounce cup. After the drinking cup is poured into the hot water, the heat-sensitive liquid in the interlayer cavity will change color and rise in the inner cup pattern passage, so that the wall of the cup shows an artistic pattern, which makes people enjoy the beauty and art enjoyment. There are all kinds of mugs, just like what you like, and each one has a surprise to meet you.

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