▎ 摘　　要

NOVELTY - Plastic comprises 25-40 pts. wt. waste plastic, 3-5 pts. wt. radix isatidis, 6-12 pts. wt. peanut protein powder, 2-3 pts. wt. titanium dioxide, 1.1-1.9 pts. wt. diisodecyl phthalate, 15-22 pts. wt. straw powder, 2-5 pts. wt. graphene, 1.5-2.5 pts. wt. talc, 6-8 pts. wt. maleic anhydride grafted polyethylene, 1.5-2 pts. wt. zinc stearate, 1-1.5 pts. wt. antioxidant and 15-26 pts. wt. montmorillonite. USE - The plastic is useful for 3D printing (claimed). ADVANTAGE - The method is simple and economical. The plastic environmentally friendly , save resources, has mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing plastic comprising (i) adding radix into water and wetted for 2-5 hours, where quality of water is 2-4 times( mass of radix isatidis) and distilled water of 15-20 times (mass of radix), maintaining temperature at 50-80 degrees C for 10-15 hours, filtering, lyophilizing filtrate to obtain radix isatidis extract, (ii) mixing straw powder and peanut protein powder and immersing in 15-35% sodium hydroxide solution for 40-60 minutes, washing with deionized water to be neutral to obtain a modified straw powder and a modified peanut protein powder, ball milling diisodecyl phthalate, graphene, maleic anhydride grafted polyethylene, modified straw powder and modified peanut protein powder in a ball mill and passed through 240-280 mesh to obtain a first mixture, (iii) mixing waste plastic, titanium dioxide, talc, zinc stearate and montmorillonite and pulverizing at -15 to -5 degrees C to obtain a second mixture, and (iv) extracting radix isatidis, first mixture, second mixture and antioxidant, mixing and heating to 110-120 degrees C in a speed of at 90-150 revolutions/minute extrusion granulator, and cooling to room temperature, to obtain finished product.