The invention discloses a low-temperature-resistant heat-insulating
composite material and a preparation method thereof, and relates to the technical field of composite materials, and the material comprises an outer protective layer, a middle reinforcing layer and an inner heat insulating layer. The inner heat
insulation layer is composed of
aerogel,
polytetrafluoroethylene micro
powder and the like, and good heat insulation performance is provided. The middle reinforcing layer contains
ethylene-propylene rubber and the like, so that the material is endowed with elasticity,
mechanical strength and
flame retardance. And the outer protective layer is made of PVC resin and the like, so that the overall strength and
wear resistance are enhanced. The low-temperature-resistant anti-
cracking additive is prepared from
polyimide resin and the like, so that the anti-
cracking performance is improved. The modified filler is prepared through a specific method, and the material performance is improved. During preparation, all the
layers are prepared respectively and then subjected to hot-pressing compounding. The internal mixer
control system guarantees preparation
parameter control of the middle enhancement layer, and a
PID control algorithm is adopted. The
composite material has the advantages of reasonable structural design, synergistic effect of all
layers, mature preparation method and process, excellent performances of low
temperature resistance, heat insulation,
cracking resistance and the like, and is suitable for being applied to various low-temperature environments.