EBECRYL® 4654

EBECRYL® 4654 is a type of aliphatic urethane acrylate supplied in a solution with n-butyl acetate. It's designed for use in UV (ultraviolet) and EB (electron beam) energy-curable coatings. When applied and dried, it forms hard polymers with excellent properties such as chemical and mechanical resistance, resistance to yellowing, and good exterior durability.

Here's a breakdown of its key features and applications:

Performance Highlights:

• Physically dry after solvent evaporation
• Exhibits good chemical and mechanical resistance properties
• High resistance to yellowing and excellent exterior durability

Suggested Applications:

• Formulation of UV/EB energy-curable coatings, particularly for automotive clear coats by spray application.

Formulating:

• Reactive diluents such as dipropylene glycol diacrylate (DPGDA), 1,6-hexanediol diacrylate (HDDA), isobornyl acrylate (IBOA), and trimethylolpropane triacrylate (TMPTA) can be used to adjust viscosity.
• Careful selection of reactive diluents and solvents is crucial for achieving desired properties and storage stability.
• Addition of standard commercial photo initiators is required for UV curing. Typical levels are 4-6%, but this may vary based on reactivity requirements.
• For EB curing, ensuring a low oxygen atmosphere is essential to avoid surface inhibition.

Typical Physical Properties:

• Acid number: 1 mg KOH/g
• Color (Apha): 100
• Density: 1.02 g/cm³ at 20°C
• Flash point: 72°C
• Solvent content (n-butyl acetate): 40%
• Viscosity at 23°C: 750 mPa.s

Precautions:

• Refer to the Safety Data Sheet (SDS) for hazard information, recommended protective equipment, and procedures.
• Avoid exposure to high temperatures, direct sunlight, ignition sources, oxidizing agents, alkalis, or acids.
• Store in appropriate containers and avoid oxygen-free atmospheres.
• Use with adequate ventilation and wash thoroughly after handling.

Storage and Handling:

• Store in stainless steel, amber glass, amber polyethylene, or baked phenolic lined containers.
• Avoid procedures that remove or displace oxygen from the material.
• Keep containers tightly closed and use with adequate ventilation.

It's important to carefully follow the recommended procedures and precautions outlined in the technical datasheet and the Safety Data Sheet (SDS) to ensure safe handling and optimal performance of EBECRYL® 4654.