1. Product Overview
Product Name: UV Absorber UV-326 Chemical Name: 2-(2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole CAS No.: 3896-11-5 Molecular Formula: C₁₇H₁₈ClN₃O Molecular Weight: 315.8 g/mol
Product Introduction: UV-326 is a high-efficiency benzotriazole UV absorber. It selectively absorbs harmful ultraviolet rays in the 270–380 nm range with minimal absorption in the visible light spectrum, delivering good light transmittance for finished products. It features excellent thermal stability, weather resistance and migration resistance. Non-toxic and odorless, alkali-resistant and oil-resistant, it hardly causes discoloration of finished articles. Compatible with various general plastics, engineering plastics and resin materials, it is the preferred light stabilizer for light-colored, transparent and food-contact plastic products.
2. Technical Specifications
表格
| Test Item |
Technical Standard |
Test Method / Remarks |
| Appearance |
Pale yellow crystalline powder |
Visual inspection |
| Purity |
≥99.0% |
High Performance Liquid Chromatography (HPLC) |
| Melting Point |
138–141 ℃ |
Capillary tube method |
| Loss on Drying |
≤0.3% |
105 ℃, constant temperature for 2 h |
| Ash Content |
≤0.1% |
High-temperature ignition method |
| Light Transmittance (460 nm) |
≥93% |
Tested in chloroform solution |
| Light Transmittance (500 nm) |
≥96% |
Tested in chloroform solution |
| Thermal Stability |
Slight decomposition at 280 ℃ |
TGA thermogravimetric analysis (weight loss ＜5%) |
| Density (20 ℃) |
1.32 g/cm³ |
Pycnometer method |
3. Physical and Chemical Properties
Solubility: Readily soluble in organic solvents and resin monomers such as , chloroform, DMF and styrene; sparingly soluble in ethanol; completely insoluble in water. It has excellent compatibility with most polymer materials.
Spectral Characteristics: Maximum absorption peaks at 312 nm and 353 nm, fully covering harmful UVA and UVB ultraviolet bands with high, stable and long-lasting light absorption efficiency.
Temperature Resistance: High thermal decomposition temperature, suitable for high-temperature plastic processing including extrusion, injection molding and blow molding. It is resistant to volatilization, decomposition and performance failure during processing.
Weathering Performance: Excellent resistance to UV aging and yellowing. It effectively delays aging, embrittlement and fading of polymer materials and greatly extends the service life of finished products.
4. Product Advantages
• High absorption efficiency: Targetedly absorbs harmful UV rays with remarkable light stabilization effect and outstanding anti-aging performance. • High transparency & low discoloration: High visible light transmittance, barely affecting the inherent color of products; especially suitable for transparent and light-colored articles. • Strong processing stability: High temperature resistance and low volatility; no precipitation, no peculiar odor and no equipment contamination during high-temperature processing. • Wide compatibility: Good compatibility with polyolefins, engineering plastics and various resins, low migration and no blooming. • Safe and eco-friendly: Non-toxic and odorless, complies with safety standards for food-contact and daily-use products with wide application scope. • Good medium resistance: Alkali-resistant, oil-resistant and moisture-resistant; stable performance without decay under harsh environments.
5. Scope of Application
Widely used in various polymer products. Core applicable materials are listed below:
- Polyolefins: Polyethylene (PE) and polypropylene (PP) pipes, films, injection-molded articles and outdoor profiles.
- Engineering plastics: ABS, polystyrene (PS), polyamide (PA) and polyurethane (PU) products.
- Resin materials: Epoxy resin, unsaturated polyester resin, cellulose resin, flexible & rigid PVC products.
- Special applications: Food-contact plastic products, transparent packaging materials, outdoor weather-resistant articles, light-colored home appliance housings, coatings, adhesives, etc.
6. Application Method & Recommended Dosage
Addition Method: Powder can be added directly before material compounding, extrusion and injection molding. It can also be pre-dissolved in organic solvents or resin monomers for dosing. Better performance can be achieved when used synergistically with conventional antioxidants and light stabilizers.
Recommended Dosage: 0.1%–0.5% (by mass) for general plastic products; dosage can be increased to 0.5%–0.8% for articles under long-term outdoor exposure and thin-wall transparent products; 0.1%–0.3% is normally sufficient for food-grade, light-colored transparent articles to obtain excellent protective effect.
Synergistic Effect: Compounding with antioxidants such as 1010, 1076 and 168 forms a dual photo-oxidative protection system, which greatly improves the anti-aging performance of materials.
7. Packaging Specification
Standard Package: 25 kg per fiber drum lined with double-layer PE moisture-proof bags. Custom small packaging is available upon customer requirements.
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