The performance of UV-curable formulations hinges significantly on the choice of photoinitiator. When formulators evaluate options for initiating rapid polymerization under UV light, Photoinitiator 1173, scientifically known as 2-hydroxy-2-methylpropiophenone (CAS 7473-98-5), consistently ranks as a top contender. This article delves into why this compound is a preferred choice and highlights the benefits of sourcing it from trusted manufacturers and suppliers in China.

Understanding Photoinitiator Classifications

Photoinitiators are broadly classified into two main types based on their fragmentation mechanism:

  • Type I Photoinitiators (Alpha-Cleavage): These molecules undergo unimolecular fragmentation upon UV absorption to directly produce free radicals. Examples include benzoin ethers, acylphosphine oxides, and crucially, alpha-hydroxy ketones like 2-hydroxy-2-methylpropiophenone.
  • Type II Photoinitiators (Hydrogen Abstraction): These require a co-initiator (a hydrogen donor) to generate free radicals. Benzophenone and thioxanthones are common examples.

Why 2-Hydroxy-2-methylpropiophenone (Photoinitiator 1173) Excels

Photoinitiator 1173, a Type I photoinitiator, offers a superior combination of properties that make it ideal for a wide array of UV curing applications:

  • Efficiency and Speed: Its direct fragmentation upon UV exposure leads to highly efficient generation of free radicals. This translates to very fast cure rates, a critical factor for high-speed industrial processes such as printing and coating lines. Manufacturers often choose it to boost productivity.
  • Low Yellowing: One of the most significant advantages of 2-hydroxy-2-methylpropiophenone CAS 7473-98-5 is its low tendency to cause yellowing in the cured film. This is particularly important for applications requiring high clarity and color stability, such as clear coats, white inks, and overprint varnishes.
  • Good Compatibility and Solubility: It readily dissolves in most common monomers and oligomers used in UV formulations, simplifying the formulation process and ensuring homogeneous curing. This broad compatibility allows formulators to easily integrate it into various resin systems.
  • Versatility: It performs exceptionally well in systems based on acrylates and methacrylates, covering a wide spectrum of applications including inks, coatings for wood, plastic, and metal, as well as adhesives.
  • Cost-Effectiveness: As a widely manufactured chemical, it offers an excellent performance-to-cost ratio, especially when sourced from bulk suppliers in China.

Comparison with Other Photoinitiators

While other photoinitiators like TPO (Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide) offer advantages in through-cure for pigmented systems or LED curing, Photoinitiator 1173 remains the go-to for many surface cure applications where speed and low yellowing are paramount. For formulators requiring a balance of properties, it is often used in synergistic blends with other photoinitiators to achieve optimal results across different UV spectrums and film thicknesses.

Strategic Sourcing: Your Advantage from China

For businesses looking to buy 2-hydroxy-2-methylpropiophenone, partnering with a reputable Chinese manufacturer and supplier offers unparalleled advantages. NINGBO INNO PHARMCHEM CO.,LTD. is committed to delivering high-purity Photoinitiator 1173 with consistent quality, competitive pricing, and reliable global logistics. When you choose us, you are securing a dependable source for this essential component. Contact us today for a quote and sample to experience the difference.