Preparation and Properties of Hyperbranched Modified Boron Nitride Epoxy Insulating Coatings.

Boron nitride (BN) was modified by KH550 to obtain f-BN particles, and BN-HBP was obtained by hyperbranched modification of f-BN. BN-HBP was added to solvent-free epoxy coating to prepare EP/BN-HBP composite coating. The properties of EP/BN-HBP composite coatings with different additions of BN-HBP were studied. The results show that compared with unmodified h-BN, BN-HBP effectively improves the mechanical properties, volume resistivity, electrical strength and corrosion resistance of solvent-free epoxy coatings. With the increasing of BN-HBP filling amount, the volume resistivity, electrical strength and corrosion resistance of EP/BN-HBP composite coating increase first and then decrease. At 25 °C, when the addition amount of BN-HBP is 0.75%, the volume resistivity of EP/BN-HBP composite coating reach the maximum. At 100 °, when the addition amount of BN-HBP is 0.5%, the electrical strength of EP/BN-HBP composite coating reaches the maximum. When the addition amount of BN-HBP is 0.75%, the corrosion resistance of EP/BN-HBP composite coating is the best. [ABSTRACT FROM AUTHOR]