Environment-friendly sealant and preparation method thereof

An environment-friendly sealant is disclosed in the invention, and is prepared from the following raw materials: bio-based waterborne polyurethane resin, nitrile rubber, polyether polyol, active nano calcium carbonate, silane modified polyether, a silane coupling agent, a plasticizer, a filler, a curing agent, a catalyst and a defoaming agent. A preparation method of the environment-friendly sealant comprises the following steps: preparing the filler plasticizer, mixing and preparing main materials, cooling, discharging and packaging. The characteristic that the environment is not polluted in the preparation and application processes of the bio-based waterborne polyurethane resin is exerted, the technical problem that in the prior art, preparation and use of a sealant are not environmentally friendly enough is effectively solved, and then the technical effect of reducing damage of the sealant to the environment is achieved. 本发明公开了一种环保密封胶，由以下组分的原材料制备而成：生物基水性聚氨酯树脂、丁腈橡胶、聚醚多元醇、活性纳米碳酸钙、硅烷改性聚醚、硅烷偶联剂、增塑剂、填料、固化剂、催化剂和