The Ultimate Guide to Irgacure 819: Applications, Types, and Technical Features
Irgacure 819, also known as Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, is a highly effective photoinitiator widely used in UV-curable formulations. This compound plays a crucial role in initiating polymerization processes upon exposure to UV light, making it essential in various industries such as coatings, inks, and composites. The following guide will delve into the different applications of Irgacure 819, its technical specifications, and how it compares to other photoinitiators in the market.
Comparison of Different Types and Applications of Irgacure 819
| Type | CAS Number | Molecular Formula | Common Applications | Purity |
|---|---|---|---|---|
| Irgacure 819 | 162881-26-7 | C26H27O3P | Coatings (clear and pigmented), inks, prepregs | 99% |
| Omnirad 819 | 162881-26-7 | C26H27O3P | UV-cured formulations, thick film systems | 99% |
| Photoinitiator 819 | 162881-26-7 | C26H27O3P | Glass fiber reinforced polyester/styrene systems | 99% |
| BAPO | 162881-26-7 | C26H27O3P | White and colored coatings, printing inks | 99% |
Understanding Irgacure 819
Irgacure 819 is a member of the phosphine oxide photoinitiator family, known for its ability to absorb UV light effectively and initiate polymerization. Its chemical structure, characterized by the presence of multiple aromatic rings and a phosphine oxide group, contributes to its high reactivity and efficiency in UV-curable systems.
Key Properties
- Molecular Weight: 418.46 g/mol
- EINECS Number: 423-340-5
- Appearance: Typically a solid powder that is soluble in various organic solvents.
Applications of Irgacure 819
Irgacure 819 is versatile and can be employed in a myriad of applications. Below, we explore the most common uses:
1. Coatings
Irgacure 819 is extensively used in UV-curable coatings for a variety of surfaces, including wood, metal, plastic, and paper. Its ability to cure quickly and efficiently makes it ideal for producing durable finishes.
- Clear Coatings: Enhances gloss and clarity while providing excellent hardness and chemical resistance.
- Pigmented Coatings: Offers outstanding performance in white and colored formulations, minimizing yellowing after UV exposure.
2. Printing Inks
In the printing industry, Irgacure 819 is favored for its ability to provide fast curing rates and excellent adhesion properties. It is particularly effective in screen printing inks that require high opacity and durability.
- Screen Printing: Works well with inks containing titanium dioxide or other pigments, ensuring vibrant colors and resistance to fading.
3. Prepregs
In composite manufacturing, Irgacure 819 is used in prepreg systems that are reinforced with glass fibers. It promotes rapid curing and enhances the mechanical properties of the final product.
- Glass Fiber Reinforced Systems: Facilitates the production of strong, lightweight materials suitable for automotive and aerospace applications.
Technical Features of Irgacure 819
| Feature | Description |
|---|---|
| Curing Mechanism | Radical polymerization upon UV exposure |
| Recommended Dosage | 0.1 – 1% depending on formulation |
| Compatibility | Can be used with other photoinitiators |
| Absorption Properties | Excellent in thick film systems |
| Yellowing Resistance | Minimal yellowing after UV exposure |
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Conclusion
Irgacure 819 is an invaluable photoinitiator that has established itself as a leader in the UV-curing industry. Its versatility across various applications—from coatings and printing inks to prepreg systems—combined with its impressive technical features, makes it a preferred choice for manufacturers seeking high-performance solutions. With a strong emphasis on curing efficiency and reduced yellowing, Irgacure 819 remains a top contender in the market.
FAQ
What is Irgacure 819?
Irgacure 819 is a photoinitiator used to initiate polymerization in UV-curable formulations. It is known for its efficiency and versatility across various applications.
What are the common applications of Irgacure 819?
Irgacure 819 is commonly used in coatings, printing inks, and prepreg systems, providing excellent curing performance and durability.
How does Irgacure 819 perform in pigmented formulations?
Irgacure 819 performs exceptionally well in white and colored formulations, offering high opacity and minimal yellowing after UV exposure.
What is the recommended dosage of Irgacure 819?
The recommended dosage varies depending on the application, typically ranging from 0.1% to 1% of the formulation.
Can Irgacure 819 be combined with other photoinitiators?
Yes, Irgacure 819 can be effectively used in combination with other photoinitiators like Irgacure 184 or Irgacure 651 for enhanced performance.
What is the molecular formula of Irgacure 819?
The molecular formula of Irgacure 819 is C26H27O3P.
What are the physical properties of Irgacure 819?
Irgacure 819 typically appears as a solid powder and is soluble in various organic solvents, making it easy to incorporate into formulations.
How does Irgacure 819 compare to other photoinitiators?
Irgacure 819 is known for its outstanding absorption properties and minimal yellowing, making it a preferred choice over other photoinitiators in many cases.
Is Irgacure 819 suitable for thick film applications?
Yes, Irgacure 819 is particularly effective in thick film systems, providing excellent curing performance even at low concentrations.
Where can I find more information about Irgacure 819?
You can explore detailed information about Irgacure 819 on various chemical databases and suppliers’ websites, including www.chemicalbook.com and www.boldchem.com.
