Multilayer composite rubber-plastic foam insulation material and preparation method thereof

A multilayer composite rubber-plastic foam insulation material, wherein the composite rubber-plastic foam insulation material comprises a two-layer structure;

• the two-layer structure comprises an insulation layer and a first functional layer;
• the insulation layer and the first functional layer are both made of a rubber-plastic foam material;
• the first functional layer and the insulation layer are integrally molded by blending extrusion and vulcanization foaming, and the first functional layer and the insulation layer form an integral structure;
• wherein raw materials of the insulation layer comprise:
• NBR, PVC, a plasticizer, a foaming agent, a filler, a flame retardant, a promoter, and a vulcanizing agent;
• wherein raw materials of the first functional layer comprise:
• NBR, a functional polymer, a plasticizer, a foaming agent, a filler, a flame retardant, a promoter, and a vulcanizing agent;
• and
• wherein the first functional layer contains 3-8% by weight of the NBR based on the weight of the first function layer, and the insulation layer contains 15% by weight of the NBR based on the weight of the insulation layer.