PU/PA纳米粒子改性酚醛树脂胶粘剂的研究

摘要

In this paper, the polyurethonc-acrylate(PU/PA) nanoparticles were prepared by self-emulsion method,and used for modifyign of phenolic resin(PF) adhesive.The influence of acrylate and epoxy resins on the adhesion properties of modified PF resin was stadied.Heat resistance. euring restion, and morphology of the modified phenolic resin system were characterized by TG,DSG SEM and TEM, The results showed that adhesion strength of modified PFresin was increased significantly, the activity of curing reaction of modificd PF resin was also increased and the fracture surface of modified PF resin showed ductile rupture character when ndding the PU/PA nanoparticles; when the adding amoount of PU/PA nanoparticles was all the thermal decomposition remperature of modified PF resin was unobviously affeeted.%采用自乳化法制备PU/PA纳米粒子,并对酚醛树脂进行增韧改性.考查了丙烯酸酯单体种类、用量以及环氧树脂用量对改性酚醛树脂粘接性能的影响.借助TG、DSC、SEM和TEM对改性酚醛树脂体系的耐热性能、固化反应和微观形态进行了表征.结果表明,PU/PA纳米粒子的加入使酚醛树脂的常温和高温粘接强度显著增加,提高了酚醛树脂的固化反应活性,酚醛树脂破坏断面呈现韧性断裂破坏特征;当加入量较少时,对酚醛树脂热失重温度影响较小.