Fluorescent Brightener
Fluorescent Brighteners
1. Definition & Mechanism
Fluorescent brighteners (optical brightening agents, OBAs) are colorless dyes that:
Absorb UV light (300–400 nm)
Re-emit blue-violet light (40...
Category：Chemical Additives
Introduction
Fluorescent Brighteners
1. Definition & Mechanism
Fluorescent brighteners (optical brightening agents, OBAs) are colorless dyes that:
- Absorb UV light (300–400 nm)
- Re-emit blue-violet light (400–500 nm)
- Counteract yellowing, enhancing perceived whiteness/brightness
2. Key Applications
| Industry | Use Cases | Example Brighteners |
|---|---|---|
| Laundry Care | Detergents, fabric softeners | Stilbene derivatives (e.g., Tinopal) |
| Paper | High-quality printing paper | Diethylamino coumarin |
| Textiles | White/colored fabric finishing | Benzoxazole compounds |
| Plastics | PVC, polyester whitening | Biphenyl-stilbenes |
3. Advantages
- Performance:
- Increase whiteness index by 20–30%
- Enhance color vibrancy (e.g., brighten dyed fabrics)
- Safety & Compliance:
- Non-toxic (OECD 301D biodegradable)
- Non-flammable (Flash point >200°C)
- REACH/EPA registered
4. Technical Specifications
| Property | Typical Value |
|---|---|
| UV Absorption Range | 340–370 nm |
| Emission Range | 420–470 nm |
| pH Stability | 2–12 (compatible with detergents) |
| Thermal Stability | Up to 250°C (for plastics) |
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