Composite nano diesel oil pour point depressant as well as preparation method and application thereof

The invention relates to a composite nanometer diesel oil pour point depressant and a preparation method and application thereof.The preparation method comprises the following steps that 1, a silane coupling agent with aminopropyl and nanometer silicon dioxide are added into a solvent A, heating and stirring are conducted, and a nanometer material is obtained after aftertreatment; and 2) adding the nano material and polyethylene-vinyl acetate into a solvent B, carrying out melt blending, and separating to obtain the composite nano diesel oil pour point depressant. Compared with the prior art, the nano silicon dioxide material treated by the silane coupling agent has organic compatibility, and is compounded with the oil-soluble polymer to prepare the composite nano diesel oil pour point depressant, so that the pour point depression effect is effectively enhanced, the low-temperature flowing property of diesel oil is improved, and the application prospect of a nano material in the field of diesel oil pour point