膨胀石墨的表面改性及其在PIR-RPUF中的应用

Surface Modification of Expandable Graphite and Its Application in PIR-RPUF

采用聚乙烯醇(PVA)、钛酸酯偶联剂对无卤阻燃剂膨胀石墨(EG)的表面进行了改性,同时将改性EG应用于PIR-RPUF(聚异氰脲酸酯改性聚氨酯泡沫塑料)的阻燃体系中。沉降试验研究表明,表面改性显著提高了EG在PIR-RPUF原料多元醇中的分散稳定性;X-射线光电子能谱(XPS)表面分析指出,改性EG表面存在大量羟基官能团。将改性EG与聚磷酸铵(APP)复合用于阻燃PIR-RPUF,其压缩强度得到相应改善。

The use of polyvinyl alcohol （PVA） and titanate coupling agent, as the surface treatment agent for expandable graphite （EG） is reported. The treated surface of EG was used to the flame retardant polyisocyanurate modified rigid polyurethane foam （PIR-RPUF/EG-APP） to improve the mechanical properties. The results of sedimentation experiment demonstrated that the surface treatment by PVA coating and titanate coupling agent could improve the dispersion stability of EG in polyol. The increase of hydroxyl groups on the surface of EG coated by PVA was approved by X-ray photoelectron spectroscopy （XPS） test. And this was the main reason of the improvement of the cornpression strength of PIR RPUF/EG-APP flame retardant system.