▎ 摘　　要

NOVELTY - Preparing high polymer composite graphene aerogel comprises (i) continuously stirring 50-150 ml oxidized graphene suspension for 6-48 hours in 5-15 ml high concentration alkaline medium for primary reduction, adding 1-2 pts. wt. polymer matrix into 30-90 pts. wt. oxidized graphene suspension, magnetically stirring for 3-18 hours, transferring to high temperature and high pressure reaction vessel for hydrothermal reaction at 110-120℃ for 24-48 hours to obtain high polymer composite graphene hydrogel, and (ii) primarily freezing the obtained graphene hydrogel for 2-6 hours at -80 to -40℃ or directly using liquid nitrogen to freeze for 10-30 minutes, vacuum drying for 1-3 days. USE - The preparation method of high polymer composite graphene aerogel is useful in high-efficiency shielding electromagnetic interference of an electronic device, and thermal conduction energy storage (all claimed). ADVANTAGE - The method is simple, has high thermal conductivity, excellent electromagnetic shielding absorption performance, good stability and good radiating effect. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a high polymer composite graphene aerogel prepared by above method, where the high polymer composite graphene aerogel is in the shape of block, cake, frustoconical or cylindrical; the quality of the graphene aerogel is very light, and the density is 0.027-1.37 g.cm; the thermal conductivity and electrical conductivity of polymer composite graphene aerogel are 7.6-9.33 W.m.K and 28.59-83.29 S.cm respectively, the thickness of the sample is at 100-420 μm, its electromagnetic interference shielding effect in the X-band (8.2-12.4 GHz) is 43.2-70.5 dB, and the electromagnetic interference shielding effect in the K-band (18-26.5 GHz) reaches 49.3-77.4 dB, the thermal conductivity and electrical conductivity of nitrogen, hydrogen and oxygen co-doped graphene aerogel after carbonization and graphitization are 60-85.4 W.m.K and 350-470 S.cm respectively, when the thickness of the sample is 100-420 μm, the electromagnetic interference shielding effect in the X-band is 37.9-68 dB, and the electromagnetic interference shielding effect in the K-band is 57-107.8 dB;-3-1-1-1-1-1-1 a composite phase change material prepared by using high polymer composite graphene aerogel, where high polymer composite graphene gel or nitrogen, hydrogen and oxygen co-doped graphene aerogel is used as thermal conductive filler and solid paraffin is a phase change material; the raw material includes 20-90 pts. wt. graphene aerogel, 5-340 pts. wt. solid paraffin and 3-7 pts. wt. water; the mass fraction of graphene aerogel in the obtained composite phase change material is 3-96.5 wt.%, the sample thickness is 100-420 m, the thermal conductivity of the polymer composite graphene aerogel /paraffin composite phase change material is 1.4-8.3 W.m.K, the electromagnetic interference shielding effect in X-band is 34.1-72 dB, and the electromagnetic interference shielding effect in K-band is 42.5-110 dB; the carbonized and graphitized nitrogen, hydrogen and oxygen co-doped graphene aerogel/paraffin composite phase change material has a thermal conductivity of 8.5-79.6 W.m.K, the electromagnetic interference shielding effect in X-band is 40-61.3 dB the electromagnetic interference shielding effect in K-band reaches 61.9-115 dB; and by adjusting the added amount of organic paraffin, the thickness and density of the phase change material is adjusted, the electromagnetic shielding band and efficiency of the composite phase change material are adjusted and the composite phase change material has the functions of anticorrosion and radiating; and-1-1-1-1 a preparation method of composite phase-change material obtained from high polymer composite graphene aerogel, comprising dispersing polymer composite graphene aerogel or nitrogen, hydrogen and oxygen co-doped graphene aerogel, and solid paraffin in ultrapure water, heating to 60-80℃, stirring for 12-24 hours, and drying to obtain completely uniform adsorption of paraffin sheet solid material, preferably high polymer composite graphene aerogel/paraffin composite phase-change material or nitrogen, and oxygen co-doped graphene aerogel/paraffin composite phase-change material.