Improving the Dispersibility of Poly(urea-formaldehyde) Microcapsules for Self-Healing Coatings Using Preparation Process

Poly(urea-formaldehyde) (PUF) microcapsules were prepared by in-situ polymerization with four different processes in this paper. The chemical composition, surface morphology, particle size distribution, and thermal stability characterized FTIR, SEM, analyzer, TGA, respectively. results demonstrated that the agglomeration of PUF was related to emulsion particles caused changes interface during shell polymerization. Due slow deposition material, core-shell structure process ammonium chloride as last additive showed good dispersibility an average diameter 6.36 μm, high core content 71.3 wt%, yield 61.3 wt%. had below 216C. could be uniformly dispersed epoxy coating a single form. 2 wt% self-healing property, service life about doubled.