Homogeneous non-combustible polyurethane foam heat insulating material and preparation method thereof

The invention discloses a homogeneous non-combustible polyurethane foam heat insulating material and a preparation method thereof. The heat insulating material is prepared by reacting the following raw materials in parts by weight: 6~20 parts of polyurethane rigid foaming material, 4~20 parts of flame retardant and 60~90 parts of inorganic filler, wherein the loose packing density of the inorganicfiller is 1.0~2.0 g/cm . The heat insulating material prepared by the invention has overall density between 120 and 800 kg/m , compressive strength being greater than and equal to 0.10 MPa, highmechanical strength, good durability, total heat value being smaller than and equal to 3.0 MJ/kg, combustion growth rate index being smaller than and equal to 120 W/s and 600 s total heat release ratebeing smaller than and equal to 7.5 MJ, and belongs to A2 grade non-combustible material, and has high fire-proofing safety and simple preparation process, and can realize industrial production. 本发明公开了种匀质的不燃型聚氨酯泡沫隔热保温材料及其制备方法，所述隔热