allnex DPHA

DPHA, or acrylated dipentaerythritol, is a multifunctional reactive diluent commonly used in UV and EB curable coatings and inks. Here's a breakdown of its key features, specifications, and precautions:

Introduction:

• DPHA polymerizes when exposed to sources of free radicals, particularly in UV and EB curable systems.
• It consists mainly of the penta- and hexa-acrylate esters of dipentaerythritol.

Performance Highlights:

• High acrylate functionality and hydroxyl functionality.
• Very low vapor pressure.
• UV/EB curable products containing DPHA exhibit rapid cure response, high cross-link density, improved scratch and abrasion resistance, excellent hardness, and good chemical resistance.

Suggested Applications:

• Recommended as a reactive diluent for UV/EB curable inks and coatings where fast cure response and high cross-link density are desired.
• Applications include scratch-resistant coatings for plastics, lithographic and screen inks.

Specifications:

• Acid value: Maximum 10 mg KOH/g.
• Appearance: Clear liquid.
• Color: Maximum 3 on Gardner scale.
• Viscosity at 25°C: 12000-20000 cP/mPa·s.

Typical Physical Properties:

• Density at 25°C: 1.17 g/ml.
• Flash Point: >100°C.
• Formula weight: 525.
• Functionality: ≥5.
• Residual solvent: <0.1 wt. %

Precautions:

• Refer to the Safety Data Sheet (SDS) for information on identified hazards, recommended personal protective equipment, and procedures.
• Avoid exposure to high-temperature conditions, direct sunlight, ignition sources, oxidizing agents, alkalis, or acids to prevent uncontrollable polymerization.
• Store and handle in appropriate containers, such as stainless steel, amber glass, amber polyethylene, or baked phenolic lined containers.
• Avoid procedures that remove or displace oxygen from the material.
• Use with adequate ventilation and wash thoroughly after handling.
• Keep the container tightly closed.
• Consult the SDS for the recommended storage temperature range.

Overall, DPHA is valued for its ability to improve cure response, hardness, and resistance properties in UV and EB curable coatings and inks, making it suitable for various applications requiring fast curing and durability.