Preparation of Nano-Al2O3-STPP@HACC Core-shell Filler and its Effect on Properties of Meta-aramid Insulating Paper
Through the methods of crosslinking and surface adsorption,shell polyquaternary ammonium salt(HACC)was coated on the surface of nano-Al2O3 with sodium tripolyphosphate(STPP)as crosslinking agent.Nano composite material with core-shell structure(Al2O3-STPP@HACC)was successfully synthesized,and Al2O3/meta aramid(PMIA)composite paper was prepared with the nano material as filler.The micro morphology,chemical composition and physical and chemical properties of nano-Al2O3 before and after modification were characterized by Zeta potential,XPS,FTIR,SEM,TEM and TG.We tested the power frequency breakdown field strength and surface charge dissipa-tion process of each paper sample,and calculated the trap distribution characteristics of insulating paper.The results show that chitosan quaternary ammonium salt shell is coated on the surface of nano-Al2O3 through electrostatic attraction and hydrogen bond,which plays the role of adhesion and transition in the polymer,and sodium tripolyphosphate plays the role of crosslinking.The tensile strength and AC breakdown strength of the modified aramid paper were 4.6 MPa and 32.6 kV/mm respectively,which increased by 38.5％and 33％respectively.At the same time,the composite pa-per had significantly enhanced thermal stability and low conductivity(7.50×10-17 S/m),and HACC@STPP could en-hance the fiber interface adhesion,introduce deep traps and limit the movement of carriers.
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