▎ 摘　　要

NOVELTY - A selected banana straw is crushed and sieved, to obtain banana stalk powder. The waste plastic is crushed, dried and sieved to obtain plastic granules. Triethanolamine soap is added to processed graphene, modified and activated, to obtain activated graphene powder. Plastic granules are added to banana stalk powder. The activated graphene powder, polylactic acid, potassium tripolyphosphate and composite (a) are reacted, to obtain primary material. The primary material is ground, and composite (b) is added and extruded, to obtain environmentally-friendly material. USE - Preparation of environmentally-friendly material (claimed). ADVANTAGE - The method enables preparation of environmentally-friendly material by economical method, using banana stalks and waste plastic. DETAILED DESCRIPTION - A selected banana straw is crushed and sieved to 300 mesh, to obtain powder. The powder is dried at 105 degrees C for 2.2 hours, and water content is controlled to 0.7%, to obtain banana stalk powder. The waste plastic is crushed with hard plastic crusher to obtain pre-crushed plastic. The crushed waste plastic is thoroughly processed with intermittent mixing plastic washing machine, and surface of dirt is removed. The plastic is dried, to obtain processed plastic. The processed plastic is placed in low-temperature mill under nitrogen or dry ice, processed at -90 degrees C to -110 degrees C, crushed for 2-3 hours and sieved to obtain plastic granules having 200-300 mesh. The graphene is processed at magnetic field intensity of 6800 GS, ultrasonic power of 600 W, 55 degrees C and 300 rpm for 16 minutes, to obtain processed graphene. Triethanolamine soap is added to processed graphene, modified and activated at 76 degrees C and 150 rpm for 0.8 hour, to obtain activated graphene powder. Plastic granules are added to banana stalk powder. The activated graphene powder, polylactic acid, potassium tripolyphosphate and composite (a) are reacted at 225 degrees C, stirred at 300 rpm for 2.8 hours and cooled to room temperature, to obtain three-dimensional printed primary material. The composite (a) is prepared by mixing aerosol generating agent, KH-550 (RTM: 3-aminopropyltriethoxysilane) coupling agent, fatty acid glyceride, modified polyacrylate and antioxidant 1010, heating mixture at 130 degrees C and 200 rpm for 65 minutes to obtain material (m1), adding ACR foam regulator to material (m1), adding polyaluminum chloride, mixing and heating mixture at 160 degrees C and 400 rpm for 142 minutes to obtain material (m2), adding di(2-ethylhexyl)phthalate to material (m2), mixing mixture and cooling mixture to 122 degrees C and stirring mixture at 300 rpm for 60 minutes. The three-dimensional printed primary material is ground at -115 degrees C, and composite (b) is added and mixed. The mixture is added to screw extruder, extruded at 205 degrees C and 115 rpm, to obtain environmentally-friendly material. The composite (b) is prepared by processing cassava starch slurry at concentration of 28?Be and pH of 3.7, adding dimethyl phosphite with concentration of 7.8%, N-ethyl-5-methyl-2-(1-methylethyl)cyclohexane carboxamide, aluminum titanium composite coupling agent and vanadium pentoxide to starch slurry, heating mixture at 59 degrees C, stirring mixture at 80 rpm, crosslinking grafting mixture for 3.8 hours to obtain slurry (s1), adding potassium hydroxide to slurry (s1), adjusting pH to 9.6, adding epichlorohydrin, carbodiimide, (ethylene glycol)azobisisobutyrate, dibutyl phthalate, methyl methacrylate-butadiene-styrene terpolymer, modified rosin resin, boric acid and ammonium dihydrogen phosphate, mixing mixture at 60 degrees C, stirring mixture at 120 rpm, crosslinking reacting mixture for 1.3 hours to obtain slurry (c), adding stearic acid to slurry (c), adjusting pH to 8.8, gelatinizing mixture at 77 degrees C for 50 minutes, cooling mixture to 30 degrees C, adding polydimethylsiloxane and stirring mixture at 130 rpm for 9 minutes.