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采用季戊四醇作为聚酯内核与二羟甲基丙酸(DMPA)发生酯化反应后,再与以松香为原料合成的马来海松酸酐(MPA)反应合成富含末端基团的超支化聚酯大分子(HBP),再分别将2-羟乙基丙烯酸酯(2-HEA)和五缩六乙二醇丙烯酸单酯(PEA-6)引入到HBP结构中,得到新型UV固化超支化树脂(HBR)。采用红外光谱对产物结构进行了表征,对固化膜进行了热重分析,通过动态力学谱测试了其粘弹性,并对涂膜的其他基本性能进行了测定。结果表明,所得树脂大都具有较低的粘度,漆膜硬度较好,对金属、塑料底材附着力较好。随着PEA-6用量的增加,产物的硬度和热力学稳定性能下降,柔韧性增加。
Using pentaerythritol as esterification reaction between polyester core and dimethylolpropionic acid (DMPA), and then reacting with maleic pimaric anhydride (MPA) synthesized from rosin to synthesize end group-containing hyperbranched polyester (HBP), 2-hydroxyethyl acrylate (2-HEA) and pentaerythritol hexaacrylate monoester (PEA-6) were respectively introduced into the HBP structure to obtain a novel UV-curable hyperbranched resin ). The structure of the product was characterized by infrared spectroscopy. The thermal gravimetric analysis of the cured film was carried out. The viscoelasticity of the cured film was tested by dynamic mechanical spectroscopy. The other basic properties of the film were also measured. The results show that most of the resulting resin has a lower viscosity, better film hardness, good adhesion to metal and plastic substrates. With the increase of the amount of PEA-6, the hardness and thermodynamic stability of the product decreased, and the flexibility increased.