At NINGBO INNO PHARMCHEM CO.,LTD., we are dedicated to advancing the understanding and application of UV curing technology. Photoinitiator 1173, chemically known as 2-Hydroxy-2-methylpropiophenone, is a cornerstone ingredient in many UV-curable formulations. This article provides a technical overview of its function and benefits.

Photoinitiator 1173 is classified as a Type I photoinitiator. This means that upon absorption of UV light energy, the molecule undergoes direct cleavage, or alpha-cleavage, to generate reactive free radicals. These radicals are the initiating species that start the chain polymerization of monomers and oligomers present in the formulation. The efficiency of this process is crucial for achieving rapid curing times and robust final properties.

The absorption spectrum of Photoinitiator 1173 is significant. It typically shows strong absorption peaks in the UV-A range, around 244 nm and 330 nm. This characteristic makes it highly compatible with common UV light sources used in curing, such as medium-pressure mercury lamps and certain UV LEDs. The matching of the photoinitiator's absorption spectrum with the emission spectrum of the UV source is critical for optimal curing performance. When selecting a light source, understanding these absorption characteristics ensures efficient energy transfer and effective polymerization.

In practice, Photoinitiator 1173 is often used in conjunction with other photoinitiators or sensitizers to broaden the spectral response or improve specific curing characteristics, such as surface cure or through cure. Its low odor and non-yellowing properties are a result of its chemical structure and the way it fragments during the curing process. This makes it a preferred choice for applications where optical clarity and long-term color stability are essential.

For industries seeking a reliable and versatile photoinitiator, Photoinitiator 1173, available from NINGBO INNO PHARMCHEM CO.,LTD., offers a proven solution. Its ability to efficiently initiate radical polymerization makes it invaluable for applications ranging from graphic arts and wood coatings to plastic and metal finishing. Understanding the technical specifications and application nuances of 2-Hydroxy-2-methylpropiophenone empowers formulators to achieve superior results in their UV curing processes.