Phenylbis(2,4,6-trimethylbenzoyl)phosphine Oxide

Product Overview

Photoinitiator 819, chemically known as Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, represents a cornerstone advancement in ultraviolet curing technology. As a high-performance acylphosphine oxide derivative, this compound is engineered to deliver superior initiation efficiency across a broad spectrum of light wavelengths. Unlike traditional initiators, it possesses unique absorption characteristics that extend into the visible light range, specifically above 400 nanometers. This property makes it an indispensable component for modern industrial formulations requiring deep cure penetration and rapid polymerization kinetics.

Our manufacturing process ensures exceptional purity levels, consistently meeting or exceeding industry standards for specialty chemical applications. The product is supplied as a light yellow crystalline powder, optimized for seamless integration into various resin systems. Whether utilized in clear coats or pigmented systems, Photoinitiator 819 provides reliable performance that enhances the durability and aesthetic quality of the final cured material.

Key Technical Features

• Exceptional absorption in the long-wavelength UV and visible light spectrum for deep curing.
• High photoreactivity ensures rapid cure speeds even in thick film applications.
• Excellent compatibility with titanium dioxide and other opaque pigments.
• Low volatility and thermal stability suitable for high-temperature processing.
• Superior weather resistance when combined with appropriate UV absorbers.
• Minimal yellowing effects compared to conventional initiation systems.

Technical Specifications

Industrial Applications

This photoinitiator is primarily designed for the UV polymerization of unsaturated prepolymer systems. Its ability to absorb visible light makes it particularly suitable for curing thick films where surface-only initiation is insufficient. Common application sectors include high-performance printing inks for wood, metal, plastic, paper, and fiber surfaces. It is especially effective in white lacquers and paints containing titanium white or other highly opaque pigments where light scattering typically hinders curing depth.

Furthermore, Photoinitiator 819 is frequently employed in prepreg systems and UV-curable coatings that demand long-term weather resistance. When formulated with UV absorbers, it contributes to the longevity of outdoor materials exposed to harsh environmental conditions. The chemical's stability allows it to function effectively in complex formulations without compromising the integrity of the polymer matrix.

Storage and Handling

To maintain optimal quality, store this product in a cool, dry, and well-ventilated area. Keep containers tightly closed when not in use to prevent moisture absorption or contamination. The material should be handled in accordance with standard industrial safety protocols for chemical substances. Transport classification identifies it under UN1993 as a flammable liquid, n.o.s., requiring appropriate packing group III measures during logistics operations. Always refer to the Safety Data Sheet (SDS) for comprehensive handling instructions and emergency procedures.