Introduction

Acrylate silicone oils are widely used in UV-curable systems to enhance surface performance and durability. Among them, di-functional (double-end) acrylate silicone oils represent a higher level of reactive silicone modification.

IOTA 2220 is a polydimethylsiloxane compound terminated at both ends with acrylate functional groups, designed specifically for UV-curable resin systems.

Structural Characteristics

Unlike mono-functional acrylate silicones, IOTA 2220 contains two acrylate groups located at both ends of the silicone chain. This di-functional structure allows the silicone segment to participate directly in the crosslinked polymer network during UV curing.

As a result:

• The silicone chain becomes an integral part of the cured film

• Migration and surface blooming are effectively eliminated

• Long-term performance stability is significantly improved

Reaction Mechanism in UV Systems

During UV curing:

1. Both acrylate end groups undergo free-radical polymerization;

2. The silicone chain acts as a flexible spacer within the network;

3. Silicone segments preferentially enrich at the surface due to low surface energy;

4. A stable, silicone-modified coating structure is formed.

This mechanism ensures permanent silicone modification rather than temporary additive effects.

Performance Advantages

• Long-lasting soft and smooth surface feel at low dosage (0.2–1%)

• Excellent anti-stain and easy-clean properties at higher dosage (2–6%)

• Improved weather resistance and UV durability

• Enhanced low-temperature flexibility

• Balanced mechanical properties without excessive brittleness

Molecular Weight Options

• MW ~2000: Better flow, leveling, and tactile performance

• MW ~4000: Enhanced durability, anti-stain performance, and weather resistance

Applications

IOTA 2220 is suitable for:

• UV-curable coatings and inks

• Functional surface coatings

• Anti-fouling and easy-clean systems

• High-performance UV resin formulations

Conclusion

Di-functional acrylate silicone oil offers a structural approach to silicone modification in UV-curable systems. By chemically integrating silicone segments into the crosslinked network, IOTA 2220 delivers long-term surface performance, durability, and flexibility, making it an ideal choice for advanced UV coating applications.