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.

Termocrômico pigmentos são micro cápsulas termocrômicas em forma de pigmento em pó. They have been specially designed for use in non aqueous based ink systems although their use is not limited.

Eles podem ser usados para formular flexográfico não aquoso à base, Uv, Tela, Deslocamento, Formulações de tinta gravure e epóxi (para aplicações aquosas recomendamos o uso de pastas termocrômicas).

Os pós termocrômicos são coloridos abaixo de uma temperatura específica, e mudar para incolor ou para outro, cor mais clara como eles são aquecidos através da faixa de temperatura. Estes pigmentos estão disponíveis em várias cores e temperaturas de ativação.

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.

1. Below Threshold: The internal components are in a solid state, allowing the molecules to interact and reflect a vibrant color.
2. At Activation Point: As heat is applied, the internal solvent melts. This physically separates the color-former from the developer.
3. 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.
4. 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° c (5°F) for cold-chain packaging to 70° c (158°F) for industrial safety warnings.
• Body-Heat Sensitivity: The most popular grade activates at 31° c (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, plásticos (injection molding), and industrial coatings.

Industrial vs. Creative Applications

Aplicação	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.

Cores padrão: Preto, Azul, Magenta, Verde, Laranja & Vermelho.

Temperaturas de ativação padrão: 15° c, 31° c ,37° c ,47° c. (customize -15°C – 80° c)

Especificações técnicas

Sólidos: 98% +/- 2%

Tamanho da partícula: <6 Mícrons (97%)

Púlvere leve (Escala de lã azul): 1 – 2

Vida útil: 12 meses

Todas as matérias-primas utilizadas para a produção de pigmentos termocrômicos estão listadas no EINECS, TSCA e DSL/NDSL.

Armazenamento e manuseio

Os pós termocrômicos são mais sensíveis às influências dos solventes, Luz UV, Ph, Cisalhamento e temperatura do que muitos outros tipos de pigmento. Note-se que existem diferenças no desempenho das várias cores para que cada um deve ser completamente testado antes da aplicação comercial.

Os pós termocrômicos têm excelente estabilidade quando armazenados longe do calor. Armazenar abaixo de 25°C. Não deixe congelar, como isso irá danificar as cápsulas termocrômicas. Uma vida útil de 12 meses é garantido, desde que o material é armazenado em um ambiente fresco e escuro. A exposição a longo prazo à luz UV ou à temperatura elevada pode causar perda de função termocrômica. O armazenamento superior a doze meses não é recomendado.

Perguntas freqüentes:

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° c, 37° c, 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.