The invention discloses an anti-
fouling ceramic insulator and a preparation method thereof, the anti-
fouling ceramic insulator is prepared by pretreating the surface of the
ceramic insulator and
drying at high temperature, and when composite gel, aluminum
oxide and
polyvinyl alcohol are mixed, pressed and roasted, a polyhedral oligomeric
silsesquioxane structure in a modified filler in the composite gel is gradually decomposed and completely volatilized; in the
decomposition process, a large amount of nanoscale holes and
amorphous silicon dioxide which are converted from a rigid inorganic silica cage framework and are uniform in size and controllable in distribution are left in a ceramic matrix, cracks can be guided to be deflected, branched or bridged, and crack propagation energy is consumed, so that the
fracture toughness of the ceramic is improved, the
brittleness of the ceramic is improved, and the service life of the ceramic is prolonged. The
magnesium chelate on the surface is beneficial to obtaining a denser sintered body and reducing internal pores, so that the
mechanical strength and the electrical insulation performance of the ceramic are directly improved, and the modified polysiloxane molecules on the surface contain organic
silicon segments and fluoroalkane structures, so that the insulator has a very good
stain-resistant effect.