Hydroxyl-terminated polyester resin, preparation method therefor and use thereof

A hydroxyl-terminated polyester resin consisting of the following components in parts by mass:

• 25-50 parts of diol, 40-70 parts of dibasic acid, 0.1-2 parts of glycidyl tertcarbonate, 0.5-4 parts of a hydroxylation reagent, 0.08-0.3 parts of a catalyst, and 0.2-0.5 parts of an antioxidant, wherein:
• the diol consists of the following components in percentage by weight:
• 60%-97% of neopentyl glycol, 1%-25% of 1,4-cyclohexanedimethanol, 0-25% of ethylene glycol, 0-20% of 2-ethyl-2-butyl-1,3-propanediol, 0-10% of 1,2-propanediol, 0-10% of 2-methyl-1,3-propanediol and 0-10% of 1,6-hexanediol;
• the dibasic acid is at least one selected from the group consisting of an aromatic dibasic acid and an aliphatic dibasic acid;
• the aromatic dibasic acid comprises terephthalic acid and isophthalic acid, wherein the mass of isophthalic acid accounts for 0-15% of the mass of aromatic dibasic acid;
• the aliphatic dibasic acid is at least one selected from the group consisting of 1,4-succinic acid, 1,6-hexanedioic acid, 1,10-decanedioic acid, dodecanedioic acid and 1,4-cyclohexanedicarboxylic acid;
• the hydroxylation reagent is at least one selected from the group consisting of 1,2,3,4,5-pentitol, 1,2,3,4,5,6-hexanehexol and 2,2-dihydroxymethyl-butanol;
• and
• the hydroxyl value of the hydroxyl-terminated polyester resin is 20-30 mgKOH/g, and the acid value of the hydroxyl-terminated polyester resin is 1-8 mg KOH/g.