▎ 摘　　要

NOVELTY - Nano-composite tanning agent comprises 40-50 pts. wt. nano-graphene oxide sheet, 10-20 pts. wt. dispersing agent, 40-50 pts. wt. zinc salt solution and 50-60 pts. wt. deionized water. USE - Nano-composite tanning agent for tanning all kinds of leather. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for dispersant preparation, which involves: (A) heating 100-150 pts. wt. deionized water to 80-90 degrees C where at the same time, the water is added with 40-50 pts. wt. monomer mixture and 30-40 pts. wt. initiator solution drop-wise where adding time is 30-40 minutes; (B) keeping mixture for 1-2 hours, after adding the monomer mixture and initiator; and (C) adding diethanolamine in mixture for adjusting product pH to 6-7 where mass fraction of obtained product is 18-20%.