1. Product Overview

Product Name: UV Absorber UV-327 Chemical Name: 2-(2'-Hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole CAS No.: 3864-99-1 Molecular Formula: C₂₀H₂₄ClN₃O Molecular Weight: 357.88 g/mol

Product Introduction: UV-327 is a high-performance benzotriazole UV absorber. It features higher molecular weight, lower volatility and superior high-temperature resistance. It efficiently absorbs harmful ultraviolet rays across the full band of 270–400 nm, covering the core damaging bands of UVA and UVB. The product has extremely low visible light absorption, delivering excellent color retention and transparency for finished articles. It possesses outstanding migration resistance, extraction resistance and smoke-stain resistance. Its thermal stability greatly outperforms conventional UV absorbers, making it compatible with various high-temperature processing technologies. It serves as an essential dedicated light stabilizer for polypropylene fibers, high-end outdoor weather-resistant products and light-colored transparent polymer materials.

2. Technical Specifications

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3. Physical and Chemical Properties

Solubility: Readily soluble in organic solvents and resin monomers such as, xylene, chloroform, styrene and ethyl acetate; sparingly soluble in methanol and ethanol; completely insoluble in water. It exhibits excellent compatibility with polyolefins and engineering plastics with no precipitation or blooming.

Spectral Characteristics: Maximum absorption peaks at 315 nm and 358 nm, with a broader spectral absorption range and higher absorption intensity. It can comprehensively block photo-oxidative aging damage caused by ultraviolet radiation to polymer materials, delivering long-lasting and stable protection.

Temperature Resistance: Thanks to its high-molecular-weight structure, it has excellent high-temperature resistance and low volatility. It can withstand processing temperatures up to 300 ℃ and adapts to high-temperature processes including fiber spinning, high-speed extrusion and precision injection molding. It does not decompose, volatilize or contaminate equipment during processing.

Weathering Performance: It has superior resistance to UV aging, yellowing and embrittlement. Meanwhile, it features unique resistance to smoke staining, oil contamination and humidity. It can withstand harsh working conditions such as outdoor exposure, high temperature & high humidity and industrial pollution, greatly extending the service life of finished products.

4. Product Advantages

• Ultra-high temperature resistance & low volatility: Higher molecular weight and stronger thermal stability, suitable for demanding processing technologies such as plastic spinning and high-temperature extrusion with no volatile loss. • Broad-spectrum high-efficiency absorption: Covers full-band UV from 270–400 nm. Its absorption efficiency exceeds ordinary benzotriazole products for more comprehensive protection. • Ultimate transparency & color retention: Extremely high visible light transmittance with almost no discoloration. Ideal for colorless, transparent and ultra-light-color products without affecting substrate appearance. • Migration & extraction resistance: Stable molecular structure, not prone to migration or leaching by solvents and rainwater, maintaining long-term protection without performance decay. • Smoke-stain & pollution resistance: Unique smoke-stain resistance effectively prevents discoloration during product processing and service, suitable for industrial outdoor articles. • Strong compatibility & versatility: Good compatibility with polyolefins, various engineering plastics, resins and additives. It can be perfectly compounded with antioxidants and hindered amine light stabilizers. • Safe, eco-friendly and non-toxic: Odorless and pollution-free, complying with industrial environmental standards, applicable to various daily-use and industrial plastic products.

5. Scope of Application

Specially designed for high-temperature processing, long-term outdoor weather resistance and high-transparency light-colored products. Core applicable materials and scenarios are listed below:

1. Polyolefin materials: Polypropylene (PP) spun fibers, outdoor PE/PP films, pipes, extruded profiles and turnover products.
2. Engineering plastics: Modified ABS, PS, PMMA, POM, PU, PC and precision plastic components.
3. General resins: Flexible & rigid PVC products, unsaturated polyester, epoxy resin and cellulose resin.
4. High-end applications: Outdoor weather-resistant coatings, adhesives, transparent packaging materials, light-colored home appliance housings, automotive plastic parts and articles for industrial smoky environments.

6. Application Method & Recommended Dosage

Addition Method: Can be directly fed in powder form and uniformly added before compounding, extrusion, injection molding and spinning processes. It can also be pre-dissolved in organic solvents or resin systems for liquid feeding. It can be compounded with antioxidants and hindered amine light stabilizers (HALS) to build a synergistic photo-oxidative protection system for greatly enhanced performance.

Recommended Dosage: 0.1%–0.5% (by mass) for conventional plastics and resin products; 0.2%–0.6% for PP spinning and high-temperature processed products; dosage can be increased to 0.6%–1.0% for products under long-term outdoor exposure and harsh industrial environments; 0.1%–0.3% is normally sufficient for transparent light-colored articles.

Synergistic Effect: Compounding with antioxidants 1010,1076,168,626 and hindered amine light stabilizers 770,944 can effectively suppress thermal-oxidative and UV aging of materials, significantly improving weather resistance and service life of finished products.

7. Packaging Specification

Standard Package: 25 kg per fiber drum lined with double-layer PE moisture-proof sealed bags. Custom small packaging sizes available upon customer request.