Preparation and Thermal Stability of Poly (urea-formaldehyde) Walled Microcapsules Containing Cumene Hydroperoxide
1. AMO (Hangzhou) Co Ltd, Hangzhou 310018, China; 2. State Key Lab of Chemical Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
Abstract：In order to improve the storage stability of precoatable anaerobic adhesive, the particle control and thermal stability of peroxide type microcapsules were studied. The microcapsules were prepared using poly(urea-formaldehyde)(PUF) as shell material and cumene hydroperoxide(CHP) as core material by in situ polymerization technology. The effects of emulsifier concentration, reaction time, agitation speed and heating rate on particle size and morphology were investigated. Microcapsules with integrated morphology were obtained when emulsifier dosage and reaction time were more than the critical value. The higher the heating rate was, the sooner the particles became stable. The agitation speed had little effect on the particle size when the reaction rate was suitable. The thermal weight loss of PUF-walled CHP microcapsules was less than that of CHP at the same temperature. The thermal stability of PUF-walled CHP microcapsules mixed with commercial anaerobic adhesive was higher than that of commercial microcapsules mixed with commercial anaerobic adhesive. The PUF-walled CHP microcapsules exhibited good storage stability.
