Лако-красочные материалы — производство

Polyamides are polymers with amide linkages (-NH-CO-) in their backbone structures. A well-known example of this type of polymer is nylon, the condensation product of an aliphatic dicarboxylic acid with aliphatic diamines, which was originally developed for replace­ment of silk. Very high MW and poor solubility of nylon makes it unsuitable for coating applications. Polyamides suitable for coatings are produced from condensation of aliphatic diamines with dime­rized fatty acids. Two types of commercial products are offered: (a) thermosetting (reactive) and (b) thermoplastic (non-reactive). The dibasic fatty acids commonly used to manufacture polyamides are prepared by dimerizing unsaturated C18 fatty acids from vegetable oils such as linseed, soybean, or tall oils. The polyamines commonly used are polyethylene polyamines of various chain lengths, such as diethylenetriamine, an example of a simple linear polyethylene poly­amine used for making reactive polyamides, while diamines such as ethylenediamine are commonly used for thermoplastic polyamides.