▎ 摘　　要

NOVELTY - An antistatic three-dimensional printing material comprises 100 pts. wt. polylactic acid, 0.2-0.4 pt. wt. modified graphene, 0.5-1.5 pts. wt. copper-coated graphite powder, 0.5-1.5 pts. wt. modified copper powder, 0.03-0.05 pt. wt. nano-silver powder, 1-5 pts. wt. stearic acid, and 3-5 pts. wt. dioctyl phthalate. USE - An antistatic three-dimensional printing material used for chemical production, oil field and automotive products. ADVANTAGE - The printing material has high degree of mechanization, less labor, low production cost, high strength, good antistatic effect and dimensional stability, less bubbles, low shrinkage, and surface smoothness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of printing material comprising: (A) mixing 3 g graphite powder 2-3 g potassium persulfate and 2-3 g phosphorus pentoxide, adding to 15-25 mL concentrated sulfuric acid, magnetically stirring at 80 degrees C for 6-8 hours, diluting with 150-250 mL distilled water, sonicating for 4-6 hours, filtering, collecting solid component, adding to 110-150 mL concentrated sulfuric acid, stirring, ice water bath cooling, adding 30-40 g potassium permanganate for 20-30 minutes at 20 degrees C or less, stirring for 30-60 minutes, heating to 35 degrees C for 2-3 hours, adding 200-300 mL distilled water, reacting to 30-50 degrees C for 2-3 hours, adding 400-500 mL distilled water, dropping 20-30 mL 20-30% hydrogen peroxide solution, filtering, washing with 300-500 mL 10% hydrochloric acid solution, washing with distilled water until neutral, air drying, and vacuum-drying to 50-60 degrees C for 12-24 hours to obtain oxidized graphene; (B) adding water to obtain 0.4-0.6 mg/mL suspension, ultrasonically dispersing for 1-2 hours, 55 wt.% dodecyldimethylbenzylammonium chloride solution at volume ratio of 1:1, stirring at 25 degrees C for 20-40 minutes, filtering, washing with distilled water until no more chloride ions, oven-drying to 50-60 degrees C, and grinding to obtain modified graphene; (C) adding 1 g graphite powder to 20-30 mL 20-26% sodium hydroxide solution for 20-30 minutes, filtering, washing solid with distilled water to neutralize, adding to 10-20 mL 15-25% nitric acid solution for 20-30 minutes, re-filtering, and washing with distilled water to neutralize; adding to 20-30 mL hydrochloric acid solution containing 15-25 g/L stannous chloride, boiling for 20-30 minutes, filtering, and washing with distilled water to neutralize; adding to 15-25 mL hydrochloric acid solution containing 0.2-0.8 g/L palladium chloride, boiling for 20-30 minutes, filtering, repeatedly washing, filtering, washing until neutralize, drying to 100-110 degrees C, and grinding to obtain modified graphite powder; (D) adding 30-36 wt.% copper sulfate pentahydrate aqueous solution and 0.8-1.2 wt.% benzotriazole alcohol solution; (E) adding 60-80 mL copper sulfate pentahydrate aqueous solution into container, adjusting pH to 2-3 using concentrated sulfuric acid, magnetically stirring, adding 0.3-0.5 g modified graphite powder, slowly heating to 60-70 degrees C, adding zinc powder, filtering, washing with distilled water to neutralize, adding 20 mL benzotriazole alcohol solution, magnetically stirring 20-30 minutes, filtering, washing solid to neutralize, drying, and grinding to obtain copper-coated graphite powder; (F) adding 1 g copper to 30-50 mL absolute ethanol, refluxing, cooling to remove copper, drying, adding to 5 wt.% hydrochloric acid solution for 2-4 hours, washing copper powder with distilled water; and dissolving 0.03-0.05 g titanium aluminum compound coupling agent in 10-30 mL isopropanol, dispersin copper powder, stirring, standing for 1-2 hours, and removing isopropanol to obtain modified copper powder; (G) mixing polylactic acid, modified graphene, copper-coated graphite powder, modified copper powder and dioctyl phthalate, extrusion granulating at extruder barrel temperature of 170-180 degrees C and die temperature of 170-190 degrees C to obtain polylactic acid-modified carbon material particles; and (H) adding remaining raw materials, extruding at extruder barrel temperature of 180-190 degrees C and die temperature of 180-200 degrees C, water cooling to 60-80 degrees C, 35-55 degrees C and 15-25 degrees C respectively.