Reversible Thermochromic pigment –The Science of Change:
Thermochromic Pigment are “smart” colorants that change their appearance in response to temperature fluctuations. Unlike traditional static dyes, these pigments act as a visual thermometer, transitioning between colors or moving from a solid hue to a transparent state once a specific thermal threshold—known as the Activation Point—is reached.
Pigmento termocromico sono micro capsule termocromatiche in forma di pigmento in polvere. They have been specially designed for use in non aqueous based ink systems although their use is not limited.
Possono essere utilizzati per formulare, Uv, schermo, compensare, Formulazioni Gravure e Inchiostro epossidico (per le applicazioni acquose si consiglia di utilizzare i liquami termocromatici).
Le polveri termocromiche sono colorate al di sotto di una temperatura specifica, e passare a incolore o ad un altro, colore più chiaro in quanto vengono riscaldati attraverso l'intervallo di temperatura. Questi pigmenti sono disponibili in vari colori e temperature di attivazione.
How It Works: The Microencapsulation Thermochromic pigment Secret
Modern thermochromic pigment (primarily Leuco Dyes) are engineered through advanced microencapsulation. Inside each microscopic droplet is a complex mixture of a color-former, a color-developer, and a solvent.
- Below Threshold: The internal components are in a solid state, allowing the molecules to interact and reflect a vibrant color.
- At Activation Point: As heat is applied, the internal solvent melts. This physically separates the color-former from the developer.
- The Result: The pigment becomes colorless (translucent), revealing whatever is underneath—whether it’s a hidden message, a secondary base color, or a printed graphic.
- Reversibility: Once the heat source is removed and the material cools, the process reverses, and the original color “magically” reappears.
Key Features & Performance
- Precision Temperature Windows: Themochromic Pigment can be calibrated to react at specific points, ranging from -15℃ (5°F) for cold-chain packaging to 70℃ (158°F) for industrial safety warnings.
- Body-Heat Sensitivity: The most popular grade activates at 31℃ (88°F). This makes the pigment change color instantly upon human touch, perfect for interactive marketing and textiles.
- High Contrast: Provides a sharp, visual “On/Off” signal that is much faster for the human brain to process than reading a digital display.
- Versatile Mediums: Available as a fine powder or a water-based slurry, it can be mixed into epoxy resins, screen-printing inks, materie plastiche (injection molding), and industrial coatings.
Industrial vs. Creative Applications
| Applicazione | Usage Scenario | Purpose |
| Smart Packaging | Beer cans or wine labels. | “Perfect Chill” indicator for the consumer. |
| Industrial Safety | Steam pipes or electrical cables. | Visual warning of overheating or “hot to touch” surfaces. |
| Smart Textiles | Fitness apparel or high-fashion. | Changes color based on body heat or environmental temp. |
| Security & Logic | Anti-counterfeit labels. | Authenticate products by simply rubbing the label with a finger. |
| Creative Arts | Coffee mugs and “magic” art. | Reveals a hidden image when a hot beverage is added. |
Colori standard: Nero, Blu, magenta inv, Verde, Orange & Rosso.
Temperature di attivazione standard: 15℃, 31℃ ,37℃ ,47℃. (customize -15°C – 80℃)
Specifiche tecniche
Solidi: 98% +/- 2%
Dimensione particella: <6 Micron (97%)
Fastità della luce (Scala di lana blu): 1 – 2
durata di conservazione: 12 mesi
Tutte le materie prime utilizzate per la produzione di pigmenti termocromatici sono elencate in EINECS, TSCA e DSL/NDSL.
Stoccaggio e movimentazione
Le polveri termocromatiche sono più sensibili alle influenze dei solventi, Luce UV, Ph, Taglio e temperatura rispetto a molti altri tipi di pigmento. Va notato che ci sono differenze nelle prestazioni dei vari colori in modo che ciascuno dovrebbe essere accuratamente testato prima di applicazione commerciale.
Le polveri termocromiche hanno un'eccellente stabilità quando vengono stoccate lontano dal calore. Conservare al di sotto dei 25 gradi centigradi. Non permettere di congelare, in quanto questo danneggerà le capsule termocromiche. Una durata a scaffale di 12 mesi è garantito a condizione che il materiale sia conservato in un ambiente fresco e buio. L'esposizione a lungo termine alla luce UV o alla temperatura elevata può causare la perdita della funzione termocromica. Lo stoccaggio più lungo di dodici mesi non è raccomandato.
Domande frequenti:
What is a Thermochromic Pigment and how does it work?
A thermochromic pigment is a ‘smart’ colorant that changes its appearance in response to temperature fluctuations through a process involving microencapsulation of a complex mixture inside tiny droplets. When the temperature is below a certain threshold, the pigment displays its vibrant color; when heated past the activation point, it becomes colorless or lighter, revealing underneath elements. Once cooled, the original color reappears, making the process reversible.
What is microencapsulation in thermochromic pigments, and why is it important?
Microencapsulation in thermochromic pigments involves enclosing the color-changing components within microscopic droplets, which allows for precise control over the temperature at which color change occurs and ensures the pigment’s stability and reversibility during heating and cooling cycles.
What are the typical activation temperatures for thermochromic pigments?
Thermochromic pigments are available with various activation temperatures, including standard options like 15°C, 31℃, 37℃, and 47°C, but they can be customized to activate within a range of -15°C to 80°C according to specific application requirements.
In which applications can thermochromic pigments be utilized?
Thermochromic pigments are used in applications such as smart packaging, industrial safety warnings, smart textiles, security labels, anti-counterfeit markings, and creative arts like mood mugs or interactive art, due to their ability to indicate temperature changes visually.
What precautions should be considered when handling and storing thermochromic powders?
Thermochromic powders should be stored below 25°C in a cool, dark environment, and must be protected from UV light, solvents, high pH, shear, and elevated temperatures to prevent performance degradation. They should not be frozen or exposed to long-term UV or heat, as this can impair their thermochromic function and performance lifespan.
