Mixed liquid crystal additive, and synthesis method and application thereof

The invention relates to a mixed liquid crystal additive, and a synthesis method and application thereof. The mixed liquid crystal additive has a structure shown in a formula below in the specification. In the formula, R is C1-10 straight-chain alkyl, and X is H or F. According to the novel mixed liquid crystal additive provided by the invention, and the compound has favorable compatibility with other monocrystals, has moderate positive dielectric anisotropy, has higher delta n value, and can effectively improve the optical anisotropy during crystal mixing, thereby being beneficial to reducing the thickness of a panel during display and increasing the response speed.