Semi-aromatic polyamide and preparation method thereof

Abstract

The invention relates to semi-aromatic polyamide and a preparation method thereof. The semi-aromatic polyamide is prepared by: adding aromatic dicarboxylic acids and the fatty diamine with 4-14 carbon atoms to an organic solvent to undergo neutralization reaction to prepare high-purification salt; pre-polymerizing by taking the high-purification salt as the raw material with the existence of water; preparing the semi-aromatic polyamide by the further tackification reaction of the prepolymer. By using high-purification salt, the preparation method can accurately control the molar ratio of dicarboxylic acids and diamine, and avoid the loss of the diamine. By purifying monomers in the salifying process, the preparation method also improves the quality of the semi-aromatic polyamide and obtains the semi-aromatic polyamide with high inherent viscosity, high crystallinity, high melting point and good mechanical performance.

Description

technical field

[0001] The invention relates to the technical field of polyamide resins, in particular to a method for preparing semi-aromatic polyamides. Background technique

[0002] Aliphatic polyamides, such as PA6 and PA66, have excellent mechanical strength, heat resistance, chemical resistance, wear resistance and self-lubricating properties, and low coefficient of friction. Their applications include electronic appliances, automotive parts, furniture , building materials and fibers, has become one of the most important engineering plastics.

[0003] Semi-aromatic polyamide is a polyamide resin prepared by polycondensation of diamines or dicarboxylic acids with aromatic rings and aliphatic dicarboxylic acids or diamines, and is one of the aromatic polyamides. Due to the introduction of aromatic rings into the main chain of polyamide molecules, the heat resistance and mechanical properties are improved, the water absorption rate is reduced, and it has a more suitable ...