▎ 摘　　要

NOVELTY - Graphene modified polylactic acid composite material comprises 3-19 pts. wt. corn stem fiber, 2-15 pts. wt. rice stem fiber, 4-14 pts. wt. palm leaf fiber, 14-26 pts. wt. graphene oxide, 2-8 pts. wt. potassium permanganate, 1-8 pts. wt. silane coupling agent, 1-6 pts. wt. glycerol, 1-7 pts. wt. hydrogen peroxide, 8-17 pts. wt. L-lactide monomer and 22-47 pts. wt. polylactic acid. USE - Used as graphene modified polylactic acid composite material. ADVANTAGE - The material has excellent crystallinity, anti-high temperature performance, impact resistance, heat resistance and strong hydrophilicity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene modified polylactic acid composite material comprising (i) adding 22-45 wt.% sodium carbonate aqueous solution of corn stalk fiber, rice stem fiber and palm leaf fiber and then reacting for 1.5-4 hours, (ii) drying treated fiber of step (i) in an oven, crushing fibers, placing in a vacuum oven, drying for 1-3 hours to obtain fiber powder, where degree of vacuum is -0.3 Pa to -0.1 Pa, and temperature is 68-85 degrees C, (iii) treating fiber powder with 25-48 wt.% sodium hydroxide solution, reacting at 40-55 degrees C for 1.5-4 hours, rinsing with deionized water to neutral and then drying, (iv) mixing fiber powder and L-lactide monomer in a mass ratio of 7-11:3-5, in vacuum state, where solvent is toluene, reacting at 45-55 degrees C for 1-3 hours, filling with helium, heating at 130 degrees C, adding catalyst to stannous octoate, magnetic stirring, reacting for 30-60 minutes and then cooling at room temperature, and (v) mixing fiber powder treated in step (iv) with graphene oxide, potassium permanganate, silane coupling agent, glycerol, hydrogen peroxide and polylactic acid, vacuum drying, placing in open mill, double-rolling at 180-190 degrees C, melting and then transferring to flat vulcanizer on hot forming to obtain final product.