Enhancement of Mica Paper Insulation Strength with Surface Modification

Mica paper is made as one kind of insulation material, but low strength limits its applications. Surface modification is proved to be an effective way to enhance its strength. In this paper modifier like ethylene diamine tetraacetic acid, cationic polyacrylamide, cationic starch, ethylene diamine tetraacetic acid plus cationic polyacrylamide and ethylene diamine tetraacetic acid plus cationic starch are introduced to improve strengths of mica paper. Finally ethylene diamine tetraacetic acid plus cationic starch is chosen as modifier of mica flakes. After modification mica paper can reach high tensile strength of 19.84N/cm, which is more than six times high than mica paper without any modification.