▎ 摘　　要

NOVELTY - Soil conditioner comprises 2-3 pts. wt. amino-terminated dendrimers, 7-10 pts. wt. chitosan gel and 5-7 pts. wt. modified graphene. USE - Soil conditioner used for prevention and treatment of soil compaction to easily compacted soil. ADVANTAGE - The soil conditioner has excellent water storage performance and swelling performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a soil conditioner, which involves: a. mixing chitosan, mixed solution and pure water in a mass ratio of 1:2:5-1:3:7, then adding potassium persulfate 0.03-0.05 times the mass of chitosan, in a nitrogen atmosphere, reacting at 30-40℃ for 15-20 minutes, then adding N,N-dimethylbisacrylamide which is 0.08-0.1 times the mass of chitosan, and reacting at 60-65℃ for 2-3 hours in a nitrogen atmosphere, cooling to room temperature, in 1-10℃, 5-10 Pascal, drying for 4-6 hours, grinding by a pulverizer until the particle size is less than 0.5mm to prepare chitosan gel; b. washing the graphene oxide with pure water until it is neutral, then mixing with pure water with 100 times the mass of graphene oxide, then adding sodium hydroxide with 20-30 times the mass of graphene oxide and 15-25 times the mass of graphene oxide with monochloroacetic acid, reacting at 50-60℃, 30-40kHz ultrasonic vibrating for 3-4 hours, filtering and washing with pure water and absolute ethanol for 3-5 times, at -10-(-5)℃, drying under 5-10 Pascal pressure for 4-6 hours to prepare modified graphene; and c. mixing amino-terminated dendrimers, chitosan gel, modified graphene, and pure water at a mass ratio of 2:7:5:60-3:10:7:90, then adding amino-terminated dendrimers potassium persulfate with a mass of 0.03-0.05 times the macromolecular mass, in nitrogen atmosphere, 30-40℃, 800-1000r/minutes stirring reaction for 2-3 hours, after cooling to room temperature, drying at 1-10℃, 5-10 Pascal for 4-6 hours to obtain a product.