▎ 摘　　要

NOVELTY - The preparation method of polyvinyl alcohol foam material using modified graphene as filler involves: (1) taking graphite powder, potassium persulfate and phosphorus pentoxide, then introducing into round-bottomed flask, again adding sulfuric acid to flask, placing flask in water bath and stirring reaction mixture; (2) transferring resulting reaction mixture obtained in step (1) to ice bath, controlling the temperature at 0-5 degrees C, adding sodium nitrate and sulfuric acid to flask, dripping potassium permanganate under stirring and continuing stirring. USE - The method is useful for preparing polyvinyl alcohol foam material using modified graphene as filler (claimed). ADVANTAGE - The method prepares polyvinyl alcohol foam material with excellent thermodynamic performance and mechanical properties. DETAILED DESCRIPTION - The preparation method of polyvinyl alcohol foam material using modified graphene as filler involves: (1) taking 10-15 g graphite powder, 5-7 g potassium persulfate and 5-7 g phosphorus pentoxide, then introducing into 1000 ml round-bottomed flask, again adding 40-60 ml 98% sulfuric acid to flask, placing the flask in water bath at 75-85 degrees C and stirring reaction mixture for 4-5 hours; (2) transferring resulting reaction mixture obtained in step (1) to ice bath after the end of reaction, controlling the temperature at 0-5 degrees C, adding 5-7 g sodium nitrate and 150-200 ml 98% sulfuric acid to the flask, dripping 20-25 g potassium permanganate under stirring, continuing stirring for 2-3 hours, controlling the temperature at 0-20 degrees C, transferring reaction mixture to water bath after the end of reaction, increasing the temperature to 30-40 degrees C, adding 250-300 ml distilled water to flask, stirring reaction mixture for 30-40 minutes, increasing the temperature to 95-100 degrees C, stirring for 20-25 minutes, pouring the reaction mixture into beaker, adding 200-260 ml distilled water and 30-40 ml 30% hydrogen peroxide to the beaker, stirring for 10 minutes, filtering, washing 3-5 times filter residue with 1 mole/l hydrochloric acid, again washing filtrate with distilled water to neutral and finally drying solid at 45-55 degrees C using oven to obtain graphene oxide; (3) taking 8-10 g graphene oxide obtained in step (2), then performing ultrasonic treatment for 20-30 minutes, adding distilled water to reaction mixture in solid-liquid ratio of 1:5 after treatment, dripping 5 mole/l sodium hydroxide solution to adjust the pH-value of suspension to 10-12, then performing ultrasonic dispersion for 8-15 minutes to obtain dispersed homogeneous suspension, adjusting pH-value of homogeneous suspension to 8-9 using ammonia to obtain yellow-brown viscous material, adding 10-20 g gelatin and 5-8 g dextrin to yellow-brown viscous material, heating at 60-70 degrees C, stirring for 20-30 minutes, adding 3-5 ml epichlorohydrin as crosslinking agents to yellow-brown viscous material, stirring mixture for 20-30 minutes to obtain viscous material; and (4) taking 30-50 g polyvinyl alcohol, then adding water, where the volume ratio of polyvinyl alcohol and water is 1:2, placing reaction mixture in water bath, setting temperature at 85-90 degrees C, stirring until the polyvinyl alcohol is fully dissolved, cooling to 65-70 degrees C, adding 0.1-0.3 g sodium hydroxide as catalyst, 3-4 g sodium lauryl sulfate as foaming agent and 1-2 g triethylamine as curing agent to above viscous material, then placing in magnetic stirrer at 650-750 rpm for 30-40 seconds, rapidly pouring reaction mixture into mold and curing at 65-70 degrees C.