“…Polyurea is a synthetic polymer from isocyanate and amine compound. It has high mechanical strength, excellent film-forming property, high electric energy density and water resistance property, which was utilized for various fields, including composited materials, aerogel, film, coating, microcapsules, dielectric materials, and steel plates (Holzworth et al 2013 ; Hong and Park 1999 ; Komurlu and Kesimal 2014 ; Li et al 2008 ; Nikishina et al 1989 ; Wu et al 2014 ). However, urea is rarely used as compound in the preparation of polyurea.…”