Abstract
Polyurea is prepared from a prepolymer based on isophorone isocyanate and a polyamine mixture, a volume ratio and molar ratio of NCO:NH2 = 1:1. The relationship between the content of NCO group in the prepolymer and some physicomechanical properties of polyurea has been studied; when the NCO group content decreases, the elongation increases, the hardness and tensile strength decrease, is caused the influence of the soft segment (PPG) in the prepolymer when the soft segment increases, the polyurea film becomes more flexible and elastic.
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