松香基超支化环氧树脂的合成及性能研究

首先以马来海松酸三缩水甘油酯(MPTGE)和马来海松酸(MPA)为主要原料,一步法合成松香基超支化聚酯(HPR),然后HPR再与环氧氯丙烷(ECH)经开环酯化、闭环反应,得到松香基超支化环氧树脂(HPER)。讨论了开环酯化、闭环反应中各因素对产物性能的影响,采用凝胶色谱仪、红外光谱仪对合成产物进行了表征,并确定了适宜的工艺条件:氯丙烷(ECH)与超支化聚酯(HPR)物质的量比为18∶1,开环反应以四丁基溴化铵为催化剂,用量为反应物总质量的2%,反应温度100℃;闭环反应中以氢氧化钠溶液作为中和剂,50℃下反应3 h。所得环氧树脂的环氧值为0.23 mol/100 g,粘度为850 mPa.s。

Study on the synthesis and properties of rosin-based hyperbranched epoxy resin

The hyperbranched polyester resin(HPR) was synthesized using maleopimaric acid triglycidyl ester(MPTGE) and maleopimaric acid(MPA)as main raw materials by one-step method.The rosin-based hyperbranched epoxy(HPER) was obtained by the opening esterification and ring-closing reaction of HPR with epichlorohydrin(ECH).The effects of various factors on the performance of the product in the esterification and ring-closing reaction were investigated and the synthesized product was characterized by gel chromatography and infrared spectroscopy.The optimum process conditions were determined as followed: molar ratio of chloropropane(ECH) to HPR 18∶ 1,using 2%tetrabutylammonium bromide(based on the total mass of the reactants)as catalyst of ring-opening reaction,reaction temperature 100 ℃,using sodium hydroxide solution as neutralizer of ring-closing reaction,reaction temperature 50 ℃ and reaction time 3 h.The epoxy value and of viscosity of synthesized resin were 0.23 mol/100 g and 850 mPa · s,respectively.