Technical Specification

Appearance: Viscous pale yellow liquid

Melting Point: -28.2℃

Density: 1003 kg/m³ at 20°C

Vapor Pressure: 9.8 × 10⁻⁵ kPa at 25°C

Water Solubility: 635 mg/L

pH Effect on Hydrolysis:

t₁/₂ (25°C, pH 4): 46.7 h

t₁/₂ (25°C, pH 7): 648.2 h

t₁/₂ (50°C, pH 9): < 2.4 h

Surface Tension: 54 mN/m (containing 461.9 mg/L of UVASIL 299)

Viscosity: 10–35 Pa·s at 25°C

Description

Riquit® Imported Color Protection Stabilizer HS-299T is a high-performance product elaborately developed to meet the color stability requirements across multiple industries. Adopting advanced imported technology and formulation, it can effectively preserve the original color of various materials under diverse environmental and processing conditions, preventing fading and discoloration to reliably guarantee product quality. It functions mainly via a regenerative stabilization mechanism. Under light and heat exposure, polymers generate free radicals which initiate polymer degradation and lead to property deterioration. HS-299T captures these free radicals to form relatively stable compounds, thus stopping free radicals from further triggering polymer degradation. Meanwhile, leveraging its structural characteristics, it converts captured free radicals into stable products and achieves self-regeneration to continuously scavenge free radicals.

Performance Features

● Efficient free radical scavenging capacity: HS-299T and its oxidized derivatives can capture a large quantity of light and heat induced free radicals. Depending on polymer types and test conditions, it can trap several to hundreds of free radicals, far exceeding hindered phenolic antioxidants. ● Excellent fiber protection: Provides effective protection for pigmented polypropylene fibers. ● Stable chemical properties: As a siloxane compound, it boasts favorable chemical stability and maintains relatively stable structure and performance under various environmental conditions for continuous stabilizing action.

Application Fields

● Plastics Industry: Widely used in polypropylene, polyethylene and other plastic materials. It effectively improves light and heat resistance and extends service life of plastic products. For outdoor plastic pipes, films and containers, it inhibits aging, discoloration and embrittlement under long-term sunlight and harsh environmental exposure. ● Fiber Industry: Especially for polypropylene fibers. It protects fibers against UV and thermal damage, retaining fiber strength, color, softness and delivering better durability and appearance. Applicable to outdoor sunshade fabrics, tents, ropes and functional apparel fibers. ● Coatings & Paints Industry: Enhances weather resistance and stability of coatings, preventing fading, chalking and peeling under UV irradiation. It protects coated substrates and prolongs the protective and decorative performance of coatings. Suitable for architectural coatings, automotive coatings, marine coatings and other coating systems.

Dosage

Typical loading: 0.05%–4%. Dosage varies with different substrates and applications.

1. In one-component polyorganosiloxane: 0.1%–2%.
2. In polyamide compositions: hindered amine loading 0.15%–1.5%.
3. In polymethyl methacrylate compositions: loading at 0.2%.