Temperature reactive and Sunlight reactive color changing materials

15-08-2019

Thermochromic leather

 

1. Principle and structure

 

Temperature change color is a kind of microcapsule pigment that changes color repeatedly as the temperature rises or falls.

 

Reversible thermochromic pigments are prepared from electron-transfer organic compounds. Electron transfer organic compounds are a kind of organic hair color system with special chemical structure. At a certain temperature, electron transfer changes the molecular structure of the organic substance, thus achieving color transformation. This kind of color changing material not only has bright color, but also can realize color change from "color === colorless" and "colorless === color", which is not available in heavy metal complex salt type and liquid crystal type reversible temperature changing material.

 

Microencapsulated reversible thermochromic substances are called reversible thermochromic pigments (commonly known as thermochromic pigments, thermochromic powders or thermochromic powders). The particles of this pigment are round, with an average diameter of 2 to 7 microns (a micron is one thousandth of a millimetre). The inside is a discoloration material, and the outside is a transparent shell about 0.2 to 0.5 microns thick that neither dissolves nor melts, protecting the discoloration material from other chemicals. Therefore, it is important to avoid breaking this shell in use.

 

2. Basic colors:

 

Basic colors: bright red, vermilion, rose, peach, orange red, gold, violet, dark blue, blue, green, black, Turkish blue

 

Temperature: 5, 8, 10, 12, 15, 18, 22, 28, 31, 33, 35, 38, 40, 43, 45, 50, 55, 60, 62, 65, 70, etc. The above temperature is the reversible temperature, for example, the red temperature becomes colorless when the temperature is higher than 31 degrees and turns red when the temperature is lower than 31 degrees.

 

Colored to colored: violet becomes red blue becomes red green becomes blue violet becomes blue orange becomes yellow blue becomes yellow red becomes yellow black becomes purple black becomes red black becomes blue black becomes blue black becomes green black becomes orange big red becomes pink dark blue becomes light green becomes light green dark yellow becomes light yellow

 

At present, the reversible temperature-changing pigments have the following 15 colors in the color display state:

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3. The color-changing temperature

 

In fact, the coloration temperature of a pigment is not a temperature point, but a temperature range, that is, the temperature range (T0 ~ T1) from the beginning of coloration to the end of coloration. The width of this temperature range is generally 4~6, and some varieties with high coloration accuracy (narrow range variety, represented by "N") have a narrow coloration temperature range, only 2~3.

 

In general, the temperature T1 corresponding to the basic completion of color-changing in the process of constant velocity heating is defined as the color-changing temperature of the color-changing pigment.

 

4. Working condition:

 

Reversible temperature-changing pigment itself is an unstable system (stability is difficult to change), so its performance of light resistance, heat resistance, aging resistance is far less than ordinary pigment, should be paid attention to in use.

 

4.1 light resistance:

 

The light resistance of temperature-changing pigment is poor, and it will fade quickly under strong sunlight, so it is only suitable for indoor use. Strong sunlight and ultraviolet light should be avoided to prolong the service life of color-changing pigments.

 

4.2 heat resistance:

 

Temperature-changing pigment can withstand high temperature of 230 (about 10 minutes) in a short time. It can be used for injection molding and high temperature curing. But the thermal stability of discoloration pigment is different from that of achromatic pigment, and the stability of the former is higher than that of the latter. In addition, when the temperature is higher than 80, the organic matter that constitutes the color-changing system will begin to degrade. Therefore, color-changing pigments should avoid long-term working at temperatures higher than 75.

 

5. Preservation of temperature-changing pigments:

 

The product should be stored in a cool, dry and completely dark condition. Because the stability of discoloration pigment is higher than that of achromatic state when hair color state, so, the variety with lower discoloration temperature should be kept in freezer. Under the above conditions, the properties of most varieties of color-changing pigments did not deteriorate significantly after 5 years of storage.

 

6. Application and application of thermochromic materials

 

Clothing,bags,belts ,wallets ,mobile phone shell ,data lines.

 

Coating: suitable for surface coating of all kinds of plastic products. Including ABS, PE, PP, PS, PVC, EVA, TPU, PC and other plastic materials

 

Ink: suitable for all kinds of printing, including mesh printing, intaglio printing and letterpress printing. It can be printed in all kinds of materials, including textile, paper, synthetic film, glass, ceramic and wood.

 

plastic: high color concentration common grade plastic masterbatch can be mixed with PE, PP, PS, PVC, EVA, PET, and Nylon for injection and delivery of products.

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Photochromic leather

 

1.Principle and application of color change:

 

The color change of light-sensitive color-changing leather after exposure to sunlight/ultraviolet radiation; When sunlight/uv rays are lost, it will return to its original color. At present, there are PU /PVC color sensitive leather.

 

Light-sensitive and color-changing leather is widely used for making handbags, shoes, luggage, ornaments, accessories, belts and so on.

 

2. Basic 4 colors:

 

Purple, red, blue, yellow. (colorless to colored)

 

3. the mutual match between the basic colors

 

4. conditions of Photochromic leather

 

Photosensitive color-changing leather itself is an unstable system (stability is difficult to change), so its light resistance, heat resistance, aging resistance and other properties far less than ordinary leather, should be paid attention to in use.

 

4.1. Light resistance:

 

Photosensitive change color leather light resistance is poor, in strong sunlight exposure will quickly fade. Should avoid the illuminate between intense sunshine and ultraviolet lamplight long, be helpful for prolonging the service life of change color leather so.

 

4.2. Heat resistance:

 

Discolored leather should avoid working at a temperature above 75 for a long time.

 

5.Preservation of Photochromic leather

 

The product should be stored in a cool, dry and completely dark condition. Under the above conditions, the properties of most varieties of leather did not degrade significantly after storage for 5 years.


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