The influence and mechanism of nano Al2O3 to the thermal stability of cellulose insulation paper

In this paper, nano Al2O3 was used as a modifier in order to improve the thermal stability of cellulose insulation paper which used in power transformer. The influence and mechanism of nano Al2O3 to the thermal stability of cellulose insulation paper were investigated by molecular simulation and experiment methods. First of all, the mechanism analysis on the surface interaction between of nano Al2O3 and cellulose indicated the easy-doping ability of nano Al2O3 to cellulose, the equation for the binding energy of surface interaction was obtained and the physical meanings of parameters in the equation were revealed. Then, nano Al2O3 with a radius of 5 Å was used to modify cellulose in MS software, the variation laws of microscopic parameters were discussed. Meanwhile, thermal ageing experiment on both modified and un-modified cellulose insulation paper was performed in laboratory. The combined analysis showed that, the thermal stability of modified cellulose insulation paper improved a lot. Finally, a deep discussion on the modification mechanism of nano Al2O3 to the thermal stability of cellulose insulation paper were presented, which introduced a theoretical reference for the future research on nano-modification technology of insulation paper.