| abstract |
The invention discloses a preparation method of a polyurethane thermal insulation material, which comprises the following steps: S1, premixing polyester polyol and polyether polyol uniformly to obtain a premix; , anionic hydrophilic chain extender, cross-linking agent and catalyst are added to the reaction vessel and mixed evenly; S3, hexamethylene diisocyanate and isophorone diisocyanate are added to the reaction vessel, stirred evenly to obtain a polyurethane base liquid ; S4, adding the polyurethane base liquid and the modified vermiculite to the organic solvent, ultrasonically treating, stirring, and reducing the pressure to remove the organic solvent, and pouring it into a pipeline mold to obtain a polyurethane thermal insulation material. The polyurethane thermal insulation material has good thermal insulation, flame retardancy and mechanical properties. |