Chemical structure and properties of polyamine epoxy powder coatings

Chemical structure and properties of polyamine epoxy powder coatings
Hue
(Excellent) alicyclic → aliphatic → amide → aromatic amine (poor)
Maturity
(Low) alicyclic → aliphatic → aromatic → amide (high)
Pot life
(Long) aromatic → amide → alicyclic → aliphatic (short)
Curing
(Fast) aliphatic → alicyclic → amide → aromatic (slow)
Irritation
(Strong) aliphatic → aromatic → alicyclic → amide (weak)
Gloss
(Excellent) aromatic → alicyclic =Aliphatic → polyamide → aliphatic amine (inferior)
Softness
(soft) polyamide → aliphatic → alicyclic → aromatic (hard)
Adhesion
(excellent) polyamide → alicyclic → aliphatic → aromatic (good)
Acid resistance
(excellent) aromatic → alicyclic → aliphatic → polyamide (inferior)
Water resistance
(excellent) polyamide → aliphatic amine → alicyclic amine → aromatic amine (good)
Chemical structure and properties of bisphenol A resin cured products
For gloss, aromatics are the best and aliphatics are the worst. This property is affected by the curing temperature, and the gloss becomes better as the temperature increases. As for softness, polyamides with long distances between functional groups are better, while aromatic amines with high crosslinking density are worse. Heat resistance is the opposite of softness, while adhesion is consistent with softness. Chemical resistance (acid resistance) is affected by the chemical structure, aromatics are relatively good, and aliphatic amines and polyamides are easily corroded by chemicals. Water resistance is governed by the mass concentration of functional groups. Polyamides with low mass concentration of functional groups and high hydrophobicity are more water-resistant, while aromatics with high mass concentration of functional groups are less resistant.