The present invention discloses an insulation foam material with a bimodal pore structure and its preparation method. The preparation method includes: preparing semi crystalline polymer/cellulose nanofiber composite particles by twin-screw extruder with modified or unmodified cellulose nanofiber aqueous solution, or further molding the particles into sheets; Perform two-stage fluid saturation treatment on the obtained particles or sheets in foaming gas, where the crystals in the particles or sheets are completely melted at the temperature of the first saturation stage, and the temperature of the second saturation stage is the crystallization temperature of the particles or sheets; Foam the processed particles or sheets to obtain insulation foam materials with bimodal pore structure. The preparation method of the present invention is simple in process, and the foam material obtained has a bimodal pore structure and excellent thermal insulation performance.
Country Code: CN
Application Number: CN202111432341.2
