The invention relates to polyasparagines ester and a synthesis method thereof, as well as a polyurea coating and a polyurethane coating prepped from the novel compound. A secondary-amino compound is characterized in that the structural formula is as shown in the specification, in the structural formula, R2, R5 and R6 are alkyl with different carbon atom numbers; R3 and R4 are respectively alkyl, aryl or hydrogen; X is alkyl, alkylene, phenyl or arylidene. According to the invention, the rapid curing speed of a coating at normal temperature is ensured, and the curing speed can be effectively controlled according to practical demands, so that the construction quality is ensured.