▎ 摘　　要

NOVELTY - Preparing high elongation at break composite material comprises rotating triethanolamine oleate modified energy graphene to obtain graphene powder, adding the energy banana stalk powder into the modified kaolin, adding the graphene energy powder, polylactic acid, tripolyphosphate and complexing agent, heating, stirring, cooling to room temperature to obtain 3 D printing primary material, adding the 3D printing primary material at -92 degrees C, crushing, adding complexing agent II, mixing, adding the uniformly mixed mixture into screw extruding forming machine and extruding. USE - The method is useful for preparing high elongation at break composite material (claimed). DETAILED DESCRIPTION - Preparing high elongation at break composite material comprises (i) crushing the banana stalk, sieving using 200-mesh sieve to obtain powder, drying the powder for 3.5 hours at 100 degrees C, controlling the water content to 1% to obtain banana stalk powder; (ii) taking kaolin with 3% water content and pH 8.7, passing through 200 mesh sieve to obtain kaolin powder, adding fatty alcohol polyoxyethylene ether ammonium sulfate and modifying to obtain modified kaolin; (iii) placing at 5200 GS graphene magnetic field intensity, at 240 W, at 40 degrees C, rotating at 200 revolutions/minute and stirring for 40 minutes to obtain energy graphene; (iv) rotating the triethanolamine oleate modified energy graphene at 52 degrees C, at 60 revolutions/minutes for 1.7 hours to obtain graphene powder; (v) adding the energy banana stalk powder into the modified kaolin, adding the graphene energy powder, polylactic acid, tripolyphosphate and complexing agent, heating to 180 degrees C, stirring at 200 revolutions/minute for 3.3 hours, cooling to room temperature to obtain 3 D printing primary material, where the preparation of the complexing agent comprises taking aerosol generating agent, coupling agent kh-550, glycidyl methacrylate, modified polyacrylate, antioxidant 1076, mixing, heating to 116 degrees C, reacting for 87 minutes at 100 degrees C/minutes and rotating to obtain material A, adding ACR foaming regulator, polymerized aluminum chloride into the material A, mixing, heating to 140 degrees C, reacting for 238 minutes at 300 revolutions/minute to obtain material B, adding di (2-ethyl hexyl) ester mixture into the material B, cooling the temperature to 108 degrees C and reacting for 140 minutes at 200 revolutions/minute to obtain complexing agent; and (vi) adding the 3D printing primary material at -92 degrees C, crushing, adding complexing agent II, mixing uniformly, adding the uniformly mixed mixture into screw extruding forming machine and extruding at 168 degrees C, at 115 revolutions/minute, where the preparation of the complexing agent II comprises preparing 22 Be ' cassava starch slurry with pH value of 3.2, adding 5.5% dimethyl phosphite, N-ethyl-5-methyl-2-(1-methyl ethyl) cyclohexane carboxamide, aluminum-titanium composite coupling agent, vanadium pentoxide into the starch slurry, reacting at 42 degrees C, stirring at 80 revolutions/minute, crosslinking for 3.8 hours, grafting to obtain the slurry b, adding potassium hydroxide into the slurry b, adjusting pH value to be 9.2, adding carbamide, epoxy bromine propane, azo di-iso-butyric acid (acrylic acid-ethylene glycol) ester, dibutyl phthalate, methyl methacrylatebutadiene-styrene terpolymer, modified rosin resin, boric acid, ammonium dihydrogen phosphate, reacting at 56 degrees C, stirring, crosslinking at 80 revolutions/minute for 3 hours to obtain slurry c, adding acid into the slurry c, adjusting the pH value to 8.4, heating to 73 degrees C for 55 minutes, cooling to 26 degrees C, adding dimethyl silicone polymer and stirring for 13 minutes at 90 revolutions/minute to obtain complexing agent II.