Light, thin, warm-keeping and temperature-adjusting modified polymer aerogel composite material and preparation method thereof

A modified polymer aerogel composite material, comprising:

• a heat insulation matrix having a topological and closed-cell foaming structure;
• and
• an element with enhanced thermal insulation and low thermal conductivity embedded in a bubble wall of the thermal insulation matrix;
• wherein the modified polymer aerogel composite material further comprises phase change microcapsules, wherein the phase change microcapsules are located in closed cells of the heat insulation matrix;
• in the modified polymer aerogel composite material, a mass percentage content of the phase change microcapsules is 5-25 wt % and
• wherein a material of the heat insulation matrix is a polyamide/NBR blended elastomer microcellular foaming material comprising the following components in parts by mass:
• 40-80 parts of NBR, 20-60 parts of polyamide, 0-100 parts of a filler, 0-50 parts of a plasticizer, 0.5-4 parts of a vulcanizing agent, 0-5 parts of a vulcanization accelerator, 1-3 parts of an antioxidant, 2-10 parts of a foaming agent, 0.5-4 parts of an active agent, and 1-4 parts of an anti-scorching agent;
• wherein the polyamide/NBR blended elastomer microcellular foaming material has a bimodal cell size distribution;
• the polyamide/NBR blended elastomer microcellular foaming material is prepared by the following method:
• 1) mixing processing:
• setting a temperature of an internal mixer above 60° C., firstly adding polyamide, adding NBR into the internal mixer after the polyamide is melted, then optionally adding a filler, optionally adding a plasticizer, and adding an antioxidant in turn;
• mixing for a first time, then setting a temperature of an open mill below 60° C., adding a vulcanizing agent, optionally adding a vulcanizing accelerator, optionally adding a foaming agent, optionally adding an active agent;
• mixing for a second time, discharging to obtain a rubber compound;
• 2) obtaining the polyamide/NBR blended elastomer microcellular foaming material with the bimodal cell size distribution and a topological and closed-cell foaming structure by a two-stage curing method:
• putting the rubber compound into an extruder, and extruding a required shape to obtain a molded rubber compound;
• putting the molded rubber compound into a molding machine at a temperature above 120° C. for a first curing;
• then raising the temperature to above 150° C. for a second curing, and then preparing the polyamide/NBR blended elastomer microcellular foaming material with the bimodal cell size distribution and the topological and closed-cell foaming structure by a rapid cooling method.