| Studies have shown that as basic material, adding the right amount of inorganicnanoparticles powder to low density polyethylene （LDPE）, can improve the electricalproperties of composite effectively. Nanocomposites express different electricalproperty by adding different nano powders. While the nanocomposites’electricalproperty would be destroyed by adding a little antioxygen. LDPE and SiO2whichproduced by Germany with good distribution and High dispersionity were bendedtogether into1wt%SiO2/LDPE, whose electrical property is excellent. For the aboveresearch purposes, the following work was made:（1）The distribution of nano powders content of1wt%,2wt%,3wt%SiO2/LDPEand good distribution and high dispersionity nano powders content of0.5wt%,1wt%,2wt%SiO2/LDPE were expressed by SEM.（2）The space charge distribution and space charge inhibitory mechanisms ofdifferent content of SiO2/LDPE were studied by electro acoustic pulse method. Theexperiment results showed that Space charge inhibitory ability were effected by thedifferent content and the dispersion of nanoparticles powders. With the increase ofadding amount of nano SiO2powders, SiO2/LDPE nanocomposites inhibited theproperty of the space charge effect is remarkable. Meanwhile, add antioxidant ofSiO2/LDPE nanocomposites can effectively inhibit the space charge injection, this isbecause the nanometer particles adding composite medium brought lots of the trapdensity, which could capture a large number of injected charge.（3）The results of DC breakdown and pulse breakdown experiments ofSiO2/LDPE nanocomposites showed that SiO2/LDPE nanocomposite can promoteDC dielectric strength obviously, meanwhile, ascension of impulse breakdownstrength is not enhanced much.（4）The space charge distribution, DC breakdown, pulse breakdown, electricalconduct of SiO2/LDPE with different content of good distribution and High dispersionitynanoSiO2powders were studied, the results showed that pace chargedistribution, DC breakdown strength, pulse breakdown strength were improved byadding a little of nanoSiO2powders. |
