| 摘要 |
The present invention pertains to an electrical insulating paper comprising 40-80 wt.% of aramid fibrid, 10-50 wt.% of aramid pulp, and 10-50 wt.% of aramid short-cut, the aramid pulp being para-aramid pulp with a length of 0.5-6 mm and a Schopper Riegler of 15-85. Preferably, the fibrid is para-aramid fibrid and/or the shortcut is para-aramid shortcut. More preferably, the fibrid is para-aramid fibrid, and the shortcut is para-aramid shortcut. It has been found that a paper meeting the above requirements shows an increased value for the product of the dielectric strength (expressed in k V/mm) and the tensile index (expressed in Nm/g), as compared to systems comprising only two of the cited components, or less than 40 wt.% of aramid fibrid. The paper is relatively easy to manufacture, and has good tear strength. The paper is particularly suitable for use in insulated conductors. |
