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 Thermochromic Pigments


I. Brief Introduction


Color changes of thermochromic pigments are induced by temperature change.

The pigments are composed by microcapsules that change colors reversibly.
When temperature rises to a specified temperature, the color starts fading and back to the original  color as the pigments is cooled down.

II. Products Feature

A) A. Nine Standard Colors

Shade Color Base Item N Pantone N Note
  Yellow YT - temp 108 C

Primary Color

YT/MT/ST

Temp from

de -15 C at 65 C 

   (Standard 31 C)

  Orange OT - temp 021 C
  Magenta MT - temp Rubine Red C
  Red RT - temp 186 C
  Green GT - temp 335 C
  Sky Blue ST - temp 313 C
  Blue BT - temp 301 U
  Violet VT - temp 2728 C
  Black LT - temp Black 5C2X

Example: YT 31 (Yellow Thermochromic pigment with color change at 31C)

 B)
Temperature of color changes

 When the temperature is increased to a specify temperature, the color start fading to colorless. The specific temperature of the color changes can be assigned at a temperature between 15C to 65C. The sensitivity of color changes is within 2C to 10C. The temperature of color change set under 33C are duller.

Example 1. BT-22 indicates the blue thermochromic pigment starts to change its color when it is heated to about 18C and becomes completely colorless att 22C. Conversely, the color starts to reveal when the temperature is decreased. Its recommended to applying this for cold drinks.

Example 2. Example 2. OT-31 indicates the orange thermochromic pigment starts to change its color when it is heated to about 29C and becomes completely coloeless at 31C. Conversely, the color starts to reveal when the temperature is decreased. This product is most suitable for products, which change colors at body temperature.

Example 3.
RT-43 indicates the red thermocromic pigment start to change its color when it is heated to about 40C and becomes completely coloress around at 43C. Conversely, the color starts to reveal when the temperature is decreased. It could be used as a caution for hot drinks.

3. Reference Colors for Application

A) By using three primary colors, you can match any color as your expect. You may mix different colors of thermochromic pigments with the same temperature to create more colors.

 

B) They can be also mixed with regular pigments so that the color can be changed from one to be another. At Lower temperature, the color reveals matched shade. When the temperature is increased, the thermochromic pigments start fading to colorless. It only shows color of the regular pigments.

C) By mixing the thermochromic pigments with different temperature ranges, the color can be varied for more than two colors.

Temperature Ranges for 3-colors variation

IV. Product's Feature

A) Thermochromics Pigments:
-
composed by microcapsules.
-
Distribution of particle size is between 1 e 10 m.
-
Heat resistance is 230C.
-
Moisture is about 0,3%.
-
The shelf life of thermochromic pigments is 2 years.

B) Thermochromic Emulsion
(W-series)
-
Water-based pigment slurry.
-
Solid concentration is 45%.
-
The dosage in aqueous inks and paintings is around 0.5%-15%.
-
The shelf life of thermochromic emulsion is 6 months.

C)
Thermochromic Universal Masterbatch (M-Series)
-
Applicable to PE, PP
-
Standard temperature for cold drink is 22C, for body temperature is 31C and for hot drink is 43C.
-
The concentration of masterbatch is 12% depending on colors.
-
The shelf life of thermochromic masterbatch is 2 years.

V. Application & Formulation

A) The thermochromic pigments have generally been applied in coloring of plastic, paints, inks, dyes and dyes fabrics. The thermocrhomic pigments have also been used in toys, sticks, the trademark and ordinary jewelry etc.

B)
Some of  the products are FDA approved.

C)
Dosage of application

Materials

Inks/ Paint
Solvent Type
Inks/ Paint
Water Soluble

Plastic
Injection - Extrusion

Application Dosage Application Dosage Application Dosage
Thermochromic
Pigments
5 30% 3 15% 0,5 3%
Thermochromic
Emulsion
- 0,5 15% X -
Thermochromic
Masterbatch
- X - 1 4%



D) The products must be stored at room temperature, in dry area and not exposed to sun.

E)
For printing inks, it is recommended to adjust the pH value of resin between 5~8.

F)
Toluene will affect the prosperities of the microcapsules. Avoid using toluene as single solvent. If the solvent is a mixture, less toluene is recommended.