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Thermocromic

1. Introduction

The core contents of thermo chromic microcapsule are leuco-dye, color developers and temperature controllers. By formulated with different temperature controllers, thermo chromic products come in various activation temperatures.

2. Product description

A. Color Conversion: When the temperature is raised to a specified temperature, it goes from colored to colorless. It returns to the original color as the temperature cools down.

Colored when temperatures raise
Colorless when temperatures cool down

B. Available Activation Temperatures: –15℃ ~ 70℃

C. Color: 15 available colors for each activation temperature. All colors can be mixed with each other or added other pigments.

Red186C     RoseRed-RoseRed-807C2X     Magenta-Rubin-RedC     Brown497C     Vermilion185C     Orange021C     Yellow387C Charm-Green-GreenC

Green 335C    Sky Blue313C    Turkish-Blue320C   Blue301U   Dark Blue294C   Violet2728C   Black-Black5C2X

3. Applications

A. Available Products & Applicability

B. Thermo chromic Slurry

a. Product description
Thermo chromic slurry is aqueous dispersion containing microcapsules and 48% of solid content. Its average particle size of the slurry is 3-7µm.

b. Properties
Good dispersal in water, suitable for aqueous based screen printing, paint, and ink.

c. Recommended concentrations
For aqueous based ink/paint 5%~60% w/w(25%)
(For the best result, about 25% concentration is required for 20µm film thickness)

d. General recommendations
Avoid high polarity solvents, such as, methanol, ethanol, acetone and methyl-ethyl-ketone, which will affect the microcapsules’ content through permeation.
Slurry may clump together during storage, which can be heated with a double boiler to disperse.
Changes of PH may cause changes of color conversion.

C. Thermo chromic Microcapsulated Powder

a. Product description
Consist of multiple formulations, containing moisture ≦ 3%. Its average particle size is 3-12µm.

b. Properties
With good solvent resistance and dispersal, thermochromic microcapsulated powder can withstand processing temperatures up to240°C, suitable for ink/paint and plastic injection/extrusion.

c. Recommended concentrations
For solvent/ aqueous based ink/paint 5%~30% w/w(25%)
(For the best result, about 25% concentration is required for 20µm film thickness)
For plastic injection/extrusion 0.1% ~5% w/w(0.5%)
(For the best result, about 0.5% concentration is required for 0.2cm plastic thickness)

d. General recommendations
Avoid high polarity solvents, such as methanol, ethanol, acetone and methyl ethyl ketone, which will affect the microcapsules’ content through permeation.
The processing temperature of injection molding should not be over 240℃.

D. Thermochromic masterbatch

a. Product description
NCC thermochromic masterbatch contains 12%-18% of microcapsules depending on the different color formulations.

b. Properties
Dispersed and used easily, can be directly applied to plastic injection/extrusion.

c. Recommended concentrations
For plastic injection/extrusion 1% ~5% w/w(0.5%)
(For the best result, about 0.5% concentration is required for 0.2cm plastic thickness)

d. General recommendations
Standard masterbatch is PE masterbatch. Please check the properties of PE for applications.
Do not add phenol type heat stabilizers only, which may destroy the color changing properties.
UV stabilizer/absorbent may affect the color changing properties.

4. Miscellaneous

A. IT&DT chart

Chart of color change to temperatures: Exp. 31℃ Red.

When temperatures are going up to 26.5℃, red color begins fading. The color completely disappears at 33℃.
When temperatures are going down to 27.5℃, red color begins appearing. The color strongest at 22℃.
Please note each color has its specific activation temperatures. The heat conduction speed of base materials does affect the thermochromic products’ reactions to temperatures.

B. Multi-Phase Color Change

a. Two-phase Color Change

b. Three-phase Color Change

c. Multi-phase Color Change

5. Others

A. Storage: Keep sealed in a dark, cool place, away from direct sunlight. Best within two years.

B. Safe for food grade packing and toys.