Environment-friendly carbon dioxide thickening agent and preparation method thereof

The invention provides a preparation method of an environment-friendly carbon dioxide thickening agent, which comprises the following steps: mixing an acrylate compound, vinyltrimethoxysilane, an initiator and an emulsifier, carrying out first polymerization reaction to obtain an intermediate, mixing the intermediate, aromatic diisocyanate, an organic solvent and a catalyst, carrying out second polymerization reaction to obtain the environment-friendly carbon dioxide thickening agent. And distilling and granulating in sequence to obtain the environment-friendly carbon dioxide thickening agent. The prepared environment-friendly carbon dioxide thickening agent has an interlaced net structure, organic silicon chain segments and aromatic rings contained in the structure of the environment-friendly carbon dioxide thickening agent harmoniously improve the thickening effect of the thickening agent, and the environment-friendly carbon dioxide thickening agent does not contain an organic solvent and is beneficial to s