▎ 摘　　要

NOVELTY - Biodegradable composite modified film/bag particle material comprises 60-80 pts. wt. oxidation modified high amylose starch, 6-10 pts. wt. composite plasticizer, 3-8 pts. wt. natural organic plant fiber material, 1-3 pts. wt. combined modifier, 20-30 pts. wt. biodegradable polyester compound, 1 pts. wt. functional assistant, 1-1.5 pts. wt. modifier, 4.5-8 pts. wt. modified carbon nanofibers and 10-30 pts. wt. inorganic filler. The preparation of the modified carbon nanofiber involves weighing a certain amount of ammonium bicarbonate and polyvinyl alcohol, adding the ammonium bicarbonate and the polyvinyl alcohol into a certain amount of deionized water, and uniformly stirring by magnetic force to obtain a mixed aqueous solution, where the mass concentration of the polyvinyl alcohol in the mixed aqueous solution is 15 wt.%, and the mass concentration of the ammonium bicarbonate is 0.1-1 wt.%. USE - Biodegradable composite modified film/bag particle material. ADVANTAGE - The adopted raw material has rich sources, cost-effective, and simple to process. DETAILED DESCRIPTION - Biodegradable composite modified film/bag particle material comprises 60-80 pts. wt. oxidation modified high amylose starch, 6-10 pts. wt. composite plasticizer, 3-8 pts. wt. natural organic plant fiber material, 1-3 pts. wt. combined modifier, 20-30 pts. wt. biodegradable polyester compound, 1 pts. wt. functional assistant, 1-1.5 pts. wt. modifier, 4.5-8 pts. wt. modified carbon nanofibers and 10-30 pts. wt. inorganic filler. The preparation of the modified carbon nanofiber involves weighing a certain amount of ammonium bicarbonate and polyvinyl alcohol, adding the ammonium bicarbonate and the polyvinyl alcohol into a certain amount of deionized water, and uniformly stirring by magnetic force to obtain a mixed aqueous solution, where the mass concentration of the polyvinyl alcohol in the mixed aqueous solution is 15 wt.%, and the mass concentration of the ammonium bicarbonate is 0.1-1 wt.%. The thermosetting phenolic resin is added into the mixed aqueous solution in a mass ratio of 2.5:1, and carried out ultrasonic treatment for 3 hours at 50degrees Celsius in a water bath to obtain a uniform and transparent solution. The uniform transparent solution is added as electrostatic spinning solution into a micro-injection pump, applied a voltage of 22-28kV to a needle head of the micro-injection pump, enabled a negative electrode receiving electrode to be a grounded stainless steel net, controlled the flow rate of the micro-injection pump, enabling liquid drops to move towards the negative electrode under the action of an electric field, performing electrostatic spinning to obtain polyvinyl alcohol/thermosetting phenolic resin composite nano fibers on the stainless steel net. The composite nanofiber is heated and cured at 100-160degrees Celsius, and then carbonized the composite nanofiber at 850-950degrees Celsius in a nitrogen atmosphere to obtain porous carbon nanofiber. The porous carbon nanofibers are added into a sodium hydroxide aqueous solution, and magnetically stirred for 1-2 hours under the water bath condition to obtain porous carbon nanofibers with hydroxylated surfaces. The 10-20 ml silver nitrate aqueous solution is added at 20-30degrees Celsius with the concentration of 0.1-0.2 mol/L and 30-50 mg hydrazine hydrate into 1 liter deionized water, magnetically stirred for 0.5-1 hours, added 5-15 ml citric acid solution with the concentration of 0.05-0.15 mol/L, continuously stirred for reaction for 0.5-1 hours, centrifugally collected a solid product, repeatedly washed with deionized water and absolute ethyl alcohol, dispersed in a proper amount of deionized water, and performed ultrasonic treatment to obtain a silver quantum dot dispersion liquid modified by citric acid. The porous carbon nanofibers is dispersed with hydroxylated surfaces into the silver quantum dot dispersion liquid modified by citric acid, magnetically stirred for 1-2 hours, and filtered and separated to obtain the porous carbon nanofibers loaded with silver quantum dots. An INDEPENDENT CLAIM is included for a method for preparing naturally biodegradable composite modified film/bag particle material, which involves: (1) weighing the following components in parts by weight: adding 60-80 pts. wt. high amylose starch and 6-10 pts. wt. composite plasticizer into a high-speed mixer, sealing a top cover, stirring for 5-12 minutes, oscillating for 30 minutes at room temperature by ultrasonic waves with the ultrasonic power of 480 watt, and sealing and placing the obtained material for 24 hours for later use; (2) weighing 3-8 pts. wt. natural organic plant fiber material and 1-3 pts. wt. combined modifier and slowly adding into the mixture at a high speed Stirring at high speed (2000 r/min) in a stirrer for 5 minutes, then oscillating at room temperature for 30 minutes by ultrasonic waves with the ultrasonic power of 480 watt, and sealing and placing the obtained material for 24 hours for later use, drying at 90-100degrees Celsius for 6-8 hours; (3) weighing 20-30 pts. wt. biodegradable polyester compound, 1 pts. wt. functional assistant, 1-1.5 pts. wt. modifier, 4.5-8 pts. wt. modified carbon nanofibers and 10-30 pts. wt. inorganic filler are added into a mixer, a top cover is sealed, and the mixture is stirred at low speed (500 r/min) for 10 minutes for later use; (4) adding the raw materials into a first material inlet of a first temperature zone of a double-order series screw granulator set with the length-diameter ratio of 48:1 through a vacuum feeding machine conveying device, and reacting; (5) adding the raw materials at 75-80degrees Celsius, 80-85degrees Celsius, 85-90degrees Celsius, 95-100degrees Celsius, 110-120degrees Celsius, 120-130degrees Celsius, 130-140degrees Celsius, 140-150degrees Celsius, 155-170degrees Celsius, 135-140degrees Celsius, 105-110degrees Celsius, 75-80 degrees Celsius and 55-60degrees Celsius and the rotation speed of the screw is 150-200 r/min, and cooling, cutting, drying and packing at 55-170degrees Celsius; (6) processing and producing various films, bags, disposable gloves, table cloth, aprons, raincoats and other products in large scale by adopting a film blowing machine, a casting machine set and other universal equipment.