1,2,4-benzeneticarboxylic anhydride terminated epoxy resin curing agent and preparing method thereof

The invention discloses an epoxy resin curing agent obtained through alcoholysis of a waste polyester material and then termination of 1,2,4-benzeneticarboxylic anhydride, and a preparing method thereof. According to the preparing method, the waste polyester material is used as the raw material, 1,3-diethylimidazolium fluoroborate is used as the catalyst, and the molecular weight and distribution of a diol compound obtained through alcoholysis are controlled by selecting catalyst content and process temperature. When the molecular weight and distribution are within a proper range, an anhydride curing agent is modified with the diol compound, so that the epoxy resin curing agent highly compatible with epoxy resin and high in curing performance is obtained. Meanwhile, the mechanical property of the epoxy resin curing agent is higher than that of the prior art. 本发明公开了种由废旧聚酯材料醇解后由偏酐封端得到的环氧树脂固化剂及其制备方法，包括以下步骤：以聚酯废料为原料，以1,3-二乙基咪唑硼氟酸盐为催化剂，通过催化剂含量和工艺温度的选择，对醇解得到的二醇化合物的分子量大小和分布进行调控。当分子量大小和分布在合适范围内时，使用其对酸酐固化剂进行改性，得到与环氧树脂