Preparation method and application of coupled modified nanometer yttrium oxide

The invention discloses a preparation method and application of coupled modified nanometer yttrium oxide. The preparation method comprises the following steps that: the nanometer yttrium oxide is weighed and is added into methylbenzene, and ultrasonic dispersion is carried out; glacial acetic acid and silane coupling agents are added, the materials are stirred for taking reaction, then, centrifugal separation is carried out, homopolymers and unreacted monomers are extracted, and vacuum drying is carried out for obtaining the silane coupling agent modified yttrium oxide; then, the silane coupling agent modified yttrium oxide is taken, methylbenzene is added, and the ultrasonic dispersion is carried out; initiating agents azodiisobutyronitrile and monomer methyl acrylate are heated to 75 DEG C in nitrogen gas atmosphere, the initiating agents are slowly added to take reaction with the monomers, then, the centrifugal separation is carried out, the homopolymers and the unreacted monomers are extracted, and the coupled grafted modified nanometer yttrium oxide is obtained after the vacuum drying; the modified nanometer yttrium oxide is used as an extreme-pressure wear-resistant and abrasion-reduction additive to be ultrasonically dispersed into liquid paraffin wax base oil or finished product lubricating oil; and good extreme-pressure wear-resistant and abrasion-reduction effects are shown.