The Science of Brighter Whites: Optical Brightener
Optical Brightener, also known as Fluorescent Whitening Agents (FWAs), are specialized chemical compounds designed to enhance the appearance of color in fabrics, matières plastiques, and paper. Unlike bleaches—which chemically remove stains—optical brighteners work through a clever “optical illusion” that makes materials appear whiter, cleaner, and more brilliant than they actually are.
How optical brightener Work: The “Blue Shift”
Most natural materials (like cotton or recycled plastic) have a slight yellow tint because they absorb a small amount of blue light from the visible spectrum. Optical brighteners fix this using fluorescence:
- UV Absorption: The molecules absorb invisible ultraviolet (Uv) light from the sun or overhead lighting.
- Re-emission: They convert that energy and re-emit it as visible blue light.
- The Result: The extra blue light masks the natural yellowness of the material. This creates a “whiter-than-white” effect that the human eye perceives as extreme cleanliness or high-end quality.
Key Features & Benefits for Optical brightener
Neutralizing Yellowing: Essential for maintaining the “new” look of white textiles and preventing the aging look of clear plastics.
- Low Dosage, High Impact: These agents are incredibly potent; even a tiny amount (often less than 0.05%) can drastically change the visual brightness of a product.
- Heat Stability: High-grade industrial brighteners (like OB-1) can withstand temperatures up to 360°C, making them perfect for high-heat plastic injection molding.
- Légèreté: Quality brighteners are engineered to resist degradation from sunlight, ensuring the “bright” effect lasts for the life of the product.
Common Industrial Grades
In the manufacturing world, optical brighteners are categorized by their specific strengths:
| Grade | Primary Use Case | Best Feature |
| OB | Paints, inks, and soft plastics (PVC/EVA). | Excellent solubility and light resistance. |
| OB-1 | Engineering plastics (ANIMAL DE COMPAGNIE, PA, PC) and polyester fiber. | Extreme heat stability for high-temp molding. |
| KCB | Synthetic leather and shoe soles. | Vivid blue-violet tone; great for “icy” finishes. |
| KSB | Coatings and transparent films. | Superior compatibility with various polymers. |
Popular Applications
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Consumer Detergents: The “blue specks” or liquid additives in laundry soap that keep your white shirts looking crisp after dozens of washes.
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Plastics & Packaging: Used in everything from white milk jugs to clear cosmetic bottles to ensure the plastic looks “clean” rather than recycled or dull.
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Paper Manufacturing: High-quality printer paper uses these agents to achieve high ISO brightness levels for sharper text contrast.
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Textiles: Essential for the production of synthetic fibers like polyester and nylon to achieve a “bleached” aesthetic without damaging the fiber’s integrity.
Nom chimique:
2,5-Thiopheneiylbis(5-tert-butyl-1,3-benzoxazole)
Nom du synonyme:
Uvitex Ob, Tinopal OB, Fluorescent Brightener 184 (Fb 184) , c.i.184, Ob, un éclaircissant fluorescent
Spécification du:
| Apparence | Légère poudre jaune verdâtre |
| Dosage | 0.01-0.05% |
| Point de fusion | 196-200℃ |
| Pureté | ≥99% |
| Solubilité | (solution g/100 g) à 20° C: |
| Acétone | 0.5 |
| Chloroforme | 14 |
| Diméthylformamide | 0.8 |
| Dioxane | 2 |
| n-Hexane | 0.2 |
| Méthanol | <0,1 |
| Méthyléthylcétone | 1.3 |
| Tricresylphosphate | 0.8 |
| Xylène | 5 |
Application:
>fonctionnalités:Effets de blanchiment bleuté brillants; excellente résistance à la chaleur; haute stabilité chimique; bonne compatibilité dans une large gamme de résine.
>Optical Brighteler OB est utilisé comme éclaircissant et pour compenser la jaunissement d’un polymère et donner un aspect plus blanc. Principalement utilisé comme thermoplastique (PVC, PS, PE, PP, ABS) éclaircissant optique. Aussi pour les revêtements, encres d’impression, Peintures, Colorants, fibres fabriquées, cuir synthétique, Cires, Graisses, et les huiles. Recommander l’utilisation à l’intérieur uniquement.
>Si ob doit être utilisé en combinaison avec un absorbeur UV, le spectre d’absorption de ce dernier doit laisser une fenêtre ouverte dans le proche UVA pour l’éclaircissant optique ob.
>Concentrations recommandées:0.02-5% dépendent de l’application et du degré de blancheur souhaité.
Remise et sécurité:
>FDA approuvé pour une utilisation dans les polymères soumis aux limitations dans 21 CFR §176.170(C).
>Pour des informations supplémentaires sur la remise et la toxicologie, s’il vous plaît nous consulter pour Fiche de date de sécurité maternelle.
Paquet:
25kg par tambour de fibre, 6*2 Couche 12 tambour par palette, 5CBM par tonne,ou selon les exigences des clients.
