Different types of saturated polyester resins with different characteristics can be synthesized by using different polybasic acids and polyols. If the glycols and dibasic acids with linear structure are used, the result is a polyester resin with only linear structure. If the polybasic acid used contains a benzene ring (for example: phthalic anhydride, terephthalic acid, trimellitic anhydride, etc.) ) What is produced is a polyester resin containing a benzene ring structure. If other ingredients except polyols and polyacids are introduced by chemical reaction, the produced is a modified polyester resin.
If synthetic polyester resin adopts a linear structure of polyols and polyacids, the synthesized resin has a linear structure and is very flexible. The main use is not in the coating industry; nylon encountered in daily life and work is very typical Linear polyester, the typical linear polyester nylon-66 is the product of hexamethylene diamine and 1,6-adipic acid. From the structural point of view, it can also be synthesized with 1,6-hexanediol and 1,6-adipic acid.
If the synthetic polyester resin reacts with the polyhydric acid of the benzene ring and the polyhydric alcohol, a resin containing a benzene ring structure is synthesized. The rigidity of the benzene ring gives the resin hardness, and the stable structure of the benzene ring gives the resin chemical resistance.
