热熔胶用马来酸酐接枝聚乙烯研究进展

通过双螺杆挤出机将马来酸酐熔融接枝聚乙烯，制备的聚乙烯热熔胶具有粘接性能强、价格低等优点，广泛地应用于钢塑复合管。本文根据近年来聚乙烯热熔胶的研究方向，综述了新型引发剂及引发方式对接枝反应的影响；比较了不同种类聚乙烯接枝效果的差异；总结了改性单体对热熔胶性能的改善以及温度、挤出机螺杆结构和转速等工艺条件对聚乙烯热熔胶的影响。分别总结了化学滴定法和红外光谱法对接枝率的表征；简述了材料表面处理和涂胶工艺对剥离强度的影响。分析了热熔胶剥离强度传统制样方法的不足，并总结了能得到稳定真实剥离强度的制样方案。展望了低马来酸酐含量、高粘接强度的绿色环保型聚乙烯热熔胶的研究前景。

Research progress of maleic anhydride grafted polyethylene for hot melt adhesive

Maleic anhydride grafted polyethylene is widely used as hot melt adhesive in steel-plastic composite pipe,because of its excellent adhesive properties,and low cost. The grafted progress is always processed through twin-screw extrude. In this paper,the effect of reaction conditions on the graft reaction are summarized,such as initiation methods,reaction temperature,screw structure and speed. The influence of initiators,PE type,and modified monomers are also concluded. Then,the characterization methods of the grafting yield are summarized,such as chemical titration and infrared spectroscopy. The effects of surface treatment and coating process on the peeling strength are discussed too. Finally,we pointed out some drawbacks of traditional sample preparing methods in peeling strength and put forward a reliable way to obtain stable and reliable peeling strength data. The research prospects of PE hot melt adhesive of low maleic anhydride content, excellent adhesion property and environmental characteristics,are predicated.