Synthesis of IPDI@PU Microcapsule Curing Agent and Its Curing Behavior for Epoxy Resin

• Published in: Journal of applied polymer science Vol. 142; no. 30
• Main Authors: Li, Xiao‐Min, Ling, Bin, Zhao, Mingyang, Cao, Wanrong, Di, Ningyu, Gao, Junkuo
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 10.08.2025; Wiley Subscription Services, Inc
• Subjects: Curing agents; differential scanning calorimetry (DSC); Emulsion polymerization; Epoxy resins; Industrial applications; Microencapsulation; polyurethane; Reaction kinetics; resins; ring‐opening polymerization; Size distribution; Storage stability
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.57216

ABSTRACT The development of latent curing agents is essential for advancements in industrial applications. In this study, we synthesize the IPDI@PU microcapsule curing agent with a regular spherical morphology and a uniform size distribution through interfacial polymerization using a lignin‐stabilized O/W Pickering emulsion as a template. The encapsulation of IPDI within the PU shell effectively inhibits its curing activity. Furthermore, the presence of the PU shell does not change the rapid reaction kinetics of the curing system. Importantly, after a storage period of 30 days at 40°C, the curing degree of the IPDI@PU/EP system is measured at only 6.4%, indicating excellent storage stability and great potential for practical applications. IPDI@PU microcapsule curing agent with rapid reaction kinetics and excellent storage period has been synthesized through interfacial polymerization using a lignin‐stabilized O/W Pickering emulsion as a template. This work expands the synthesis strategies to facilitate the development of latent curing agents.