Secondary amine chain extender is a key raw material in the formulation system of two-component polyurea waterproofing coatings.The steric hindrance groups in its molecular structure can effectively reduce reaction activity,improve operability,increase formulation tolerance,and improve material properties.This article focuses on the application of three types of environment friendly liquid secondary amine chain extenders in five different formulation systems:two-component spray polyurea waterproofing coatings(aromatic and aliphatic),and two-component brush polyurea waterproofing coatings(asparagus polyurea,new type and viscoelastic type).
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