Common structure of polyester resin

Release time:

2024-02-01


The raw materials for the synthesis of saturated polyester resins are mainly dihydric alcohols, dibasic acids and trihydric alcohols, and individual monohydric alcohols or monohydric acids. The most commonly used alcohol is neopentyl glycol, the water resistance of which is much better than that of ethylene glycol and propylene glycol. Trihydric alcohols are mainly trimethylol propane and triethylol ethane. The most commonly used aromatic dibasic acid is isophthalic acid. Isophthalic acid is more widely used in polyester resins because of its superior salt spray resistance, chemical resistance and water resistance than phthalic acid. Aliphatic dibasic acids, such as adipic acid, azelaic acid and sebacic acid, are also used in synthetic polyester resins, with adipic acid being more commonly used. Most resins contain aromatic dibasic acid and aliphatic dibasic acid, and the molar ratio of aromatic dibasic acid to aliphatic dibasic acid is the main factor to control the Tg of the resin.

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