A preparation method of core-shell nano-titanium oxide@zirconia particles-polypropylene maleic anhydride grafted polypropylene composite material

Abstract

The invention discloses a core-shell nano-TiO 2 @ZrO 2 A preparation method of particle-polypropylene / maleic anhydride grafted polypropylene composite material relates to the field of power capacitors, including: preparing core-shell nano-TiO 2 @ZrO 2 Particles: Core-Shell TiO 2 @ZrO 2 Modification of nanoparticles; preparation of masterbatch: preparation of core-shell nano-TiO 2 @ZrO 2 Particle-polypropylene / maleic anhydride grafted polypropylene" composites: preparation of core-shell nano-TiO 2 @ZrO 2 Particle-polypropylene / maleic anhydride grafted polypropylene" composite material film. The core-shell nano-TiO obtained by the present invention 2 @ZrO 2 / polypropylene / maleic anhydride grafted polypropylene composites, when nano-TiO 2 @ZrO 2 When the doping concentration of the core-shell particles in the organic matrix is ​​1.0 wt%, the breakdown field strength is increased the most by 28%, and when the doping concentration is 0.5%, the energy storage density is increased the most, by 57%.

Description

technical field [0001] The invention relates to the field of power capacitors, in particular to a core-shell nano-TiO 2 @ZrO 2 Particles - Preparation of polypropylene / maleic anhydride grafted polypropylene composites. Background technique [0002] With the rapid development of UHV DC transmission technology and flexible DC transmission technology, the demand for power capacitors has increased sharply. The development of lightweight, miniaturized, and high energy storage density power capacitors has become an important link in the development of DC transmission technology. Therefore, the performance requirements of high dielectric constant, high breakdown field strength and low dielectric loss are put forward for polypropylene film as the dielectric material of power capacitor. [0003] Although the current commercial polypropylene film has the advantages of high dielectric constant and low dielectric loss, it is widely used, but its low energy storage density limits its f...

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Problems solved by technology

[0005] However, the core particles used in the core-shell structure are mostly high-dielectric ceramic nanoparticles with high dielectric constant barium titanate, etc., and their orders of magnitude are often 10 2 Above, resulting in the high dielectric loss of the prepared composite material, which limits the further improvement of the breakdown field strength and makes the improvement of the energy storage density difficult.

However, using nano-zirconia, nano-zinc oxide and other intermediate dielectric constant inorganic fillers as core particles, the doping work of core-shell particles using core-shell structure for interface modification is still less.

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