Reference

Polyurethane coatings that utilize the trimer of isophorone diisocyanate (IPDI) are known for their excellent durability, chemical resistance, and flexibility. Here's how they function:

1. Chemical Structure: The trimer of isophorone diisocyanate is a cyclic compound that enhances the cross-linking density in polyurethane coatings. This structure contributes to the coating's hardness and resistance to environmental factors.

2. Cross-Linking: When the trimer of IPDI reacts with polyols, it forms a tightly cross-linked network. This cross-linking is crucial for creating a robust and durable film that can withstand mechanical stress and chemical exposure.

3. Weather Resistance: The aliphatic nature of IPDI provides excellent UV stability, making these coatings suitable for outdoor applications where exposure to sunlight can degrade other types of coatings.

4. Flexibility and Adhesion: Despite their hardness, these coatings maintain flexibility, which helps in accommodating substrate movements without cracking. This is particularly beneficial in applications where thermal expansion or mechanical stress is a concern.

5. Chemical Resistance: The dense cross-linked network also imparts superior resistance to solvents, acids, and alkalis, making these coatings ideal for industrial environments where chemical exposure is common.

6. Application Versatility: These coatings can be applied to a variety of substrates, including metals, plastics, and wood, providing a protective and aesthetically pleasing finish.

Overall, the use of the trimer of isophorone diisocyanate in polyurethane coatings results in a high-performance product suitable for demanding applications, offering long-lasting protection and aesthetic appeal.