Water-based acrylic sealant for extremely cold environment and preparation method of water-based acrylic sealant

The invention discloses a water-based acrylic sealant for an extremely cold environment and a preparation method thereof, and the water-based acrylic sealant for the extremely cold environment comprises the following components by weight: 30-60 parts of anionic silicon-fluorine modified acrylic emulsion; 0.5-1 part of a dispersant; 5-10 parts of a plasticizer; 2-5 parts of an adhesion promoter; 35 to 55 parts of filler; 1 to 1.5 parts of fumed silica; 3-5 parts of a thickening agent; and 0.5-1 part of an antifreeze agent. Compared with the prior art, the water-based acrylic sealant for the extremely cold environment, provided by the invention, has the advantages that the used emulsion is the anionic silicon-fluorine modified acrylic emulsion, and the anionic silicon-fluorine modified acrylic emulsion is prepared from butyl acrylate and acrylic acid-2-ethylhexyl ester in a specific ratio by a specific preparation method; and the water-based acrylic sealant prepared by matching with fillers of other modifiers h