In coating formulation systems, the selection of amine additives directly affects the final properties of the film. Among them, DMEA (N,N-Dimethylethanolamine) and AMP-95 (2-Amino-2-methyl-1-propanol) are commonly used additives. Due to differences in molecular structure and mechanism of action, they show significant differences in key properties such as water resistance. 


The core difference between the two lies in the amine residues left in the film after drying. DMEA is a non-volatile amine, and its molecular structure contains hydrophilic groups - OH and - N-, acting like a built-in "water-absorbing suction cup." During the film curing process, although water evaporates, these hydrophilic groups remain firmly in the film. When the ambient humidity increases, these groups actively attract water molecules from the air, causing the film to absorb moisture and whiten. Long-term use may lead to decreased adhesion and reduced corrosion resistance.


AMP-95, on the other hand, is a co-volatile amine with a molecular design of sterically hindered primary amine providing great advantages. During the film drying stage, it undergoes reversible reactions with water molecules and carboxyl groups in the emulsion. As the water gradually evaporates, the reaction equilibrium is broken, and AMP-95 decomposes from its salt form into free amine. With a relatively low boiling point, it volatilizes together with residual moisture and film-forming aids, leaving almost no amine residue in the final film. This inherently prevents moisture absorption and essentially has no negative impact on water resistance.


In practical applications, AMP-95 is the better choice for exterior wall coatings, furniture coatings, and other scenarios requiring high water resistance. DMEA, due to its lower cost and faster neutralization, can be used for interior wall coatings or temporary protective coatings where water resistance is less critical. Properly distinguishing between the characteristics of the two allows for precise matching with coating formulation requirements and ensures stable product performance.