color change materials thermochromism pigment

. Introduction

The core contents of thermochromic microcapsule are leuco-dye, color developers and temperature controllers. By using different temperature controllers, NCC thermochromic 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. The product returns to the original color as the temperature cools down.

Colored as temperatures raise Colorless as temperatures cool down

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

C. Color: 15 available colors for each activation temperature. (Except 70℃, only black and dark blue available for 70℃) All colors can be mixed with each other or added other pigments.

Product Description

Thermochromic slurry is microencapsulated aqueous dispersion with good dispersal in water, suitable for water based ink, paint. It contains 45%(±5%) of solid content. The average particle size of the slurry is 3-10µm.

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 (For best results, 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 contents through permeation.

Slurry may clump together during storage. Heating the slurry to 45℃ in a double boiler to disperse.

Changes of PH may cause changes of color conversion.

C. Thermochromic Microcapsulated Powder

a. Product Description

consist of compound formulation, containing moisture ≦ 3%. Its average particle size is 3-10µm.

b. Properties

With good solvent resistance and dispersal, thermochromic microencapsulated powder is suitable for ink/paint and plastic injection/extrusion.

c. Recommended Concentrations

For solvent/ aqueous based ink/paint 　　　　　 5%~30% w/w (For best results, about 25% concentration is required for 20µm film thickness)

For plastic injection/extrusion　　　　　 0.1% ~5% w/w (For best results, 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 contents through permeation.

The processing temperatures of plastic applications should not be over 230℃.

D. Thermochromic Masterbatch

a. Product Description

Thermochromic masterbatch contains 12%-18% of microcapsules. The percentage of microcapsules contained depends on its 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 (For best results, about 0.5% concentration is required for 0.2cm plastic thickness)

d. General Recommendations

Standard masterbatch is PE masterbatch.

Add phenolic heat stabilizers only may destroy the color changing properties.

UV stabilizer/absorbent may affect the color changing properties.

4. Miscellaneous

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

B. Expiratory date: Half year for Dark Blue, Charm Green, Turkish Blue and Brown from the date of manufacture. Two years for the others.

C. Certifications: EN-71 & RoHS passed. Safe for food grade packing and toys.