▎ 摘　　要

NOVELTY - Preparing graphene-aqueous polyurethane composite material involves adding 230 mL sulfuric acid in dry beaker and mixing 5 g graphite, sodium nitrate and 30 g potassium permanganate under magnetic stirring for 2 hours to obtain mixture. The obtained mixture is added into warm water bath at 35 degrees C for 30 minutes and added with 200mL distilled water then heated at 90 degrees C under stirring for 30 minutes to obtain diluted mixture. The obtained diluted mixture is added with 1000mL of 30g hydrogen peroxide and filtered to obtain mixture filter residue. USE - Method for preparing graphene-aqueous polyurethane composite material (claimed). ADVANTAGE - The method enables to prepare graphene-aqueous polyurethane composite material in a simple manner, which has good stability, good performance and ensures safety and reliability. DETAILED DESCRIPTION - Preparing graphene-aqueous polyurethane composite material involves adding 230 mL sulfuric acid in dry beaker and mixing 5 g graphite, sodium nitrate and 30 g potassium permanganate under magnetic stirring for 2 hours to obtain mixture. The obtained mixture is added into warm water bath at 35 degrees C for 30 minutes and added with 200mL distilled water then heated at 90 degrees C under stirring for 30 minutes to obtain diluted mixture. The obtained diluted mixture is added with 1000mL 30g hydrogen peroxide and filtered to obtain mixture filter residue. The obtained mixture filter residue is mixed with 5 wt.% hydrochloric acid and deionized water then the pH is adjusted to 6.8-7.2 at 45 degrees C and dried in oven to obtain oxidized graphite powder. The obtained 150mg oxidized graphite powder is mixed with dehydrated N, N-dimethylformamide and transferred into vials to obtain an oxidized graphene solution at a concentration of 3 g / L. The 100 g toluene diisocyanate and 50 mL dehydrated N, N-dimethylformamide are mixed into a dry three-necked flask to obtain toluene mixture. The obtained toluene mixture is placed in an ice-water bath at 0 degrees C and added with 0.5g ethyl ketone oxime under stirring to obtain semi-blocked toluene diisocyanate, which is stored in refrigerator stored at low temperature. The 150 mg anoxylated graphene solution is mixed with N,N-dimethylformamide in a four-necked flask and added with 2 g semi-blocked toluene diisocyanate and mixed under stirring for 50 hours then added with 1mL hydrazine hydrate at 100 degrees C for 24 hours to obtain second mixture. The obtained second mixture is washed with acetone and centrifuged, for repeated times until the elution of acetone solution to obtain functionalized graphene containing blocked isocyanate (NCO) group, which is dried in vacuum for 45 hours then crushed into powder to obtain functionalized graphene containing blocked isocyanate (NCO) group powder stored in a desiccator. The polybutylene adipate is subjected to dehydration at 120 degrees C, -0.09 megapascal pressure for 1-1.5 hours to obtain dehydrated polybutylene adipate. The obtained dehydrated polybutylene adipate is mixed with 2-pyrrolidone for 3 hours at 80 degrees C then adding 3 drops of dibutyltin dilaurate under stirring for 1 hours to obtain third mixture. The obtained third mixture is added and mixed with functionalized graphene containing blocked isocyanate (NCO) group powder under stirring at 30-35 degrees C for 30 minutes, then adding triethylamine and mixing for 5 minutes with the addition of deionized water to obtain the semi-finished product. The obtained semi-finished product is added with oxidized graphene solution, and ethylenediamine under stirring for 10 hours the filtered using graphene-waterborne polyurethane composite material to obtain dispersion. The obtained dispersion is placed in a mold and cured in a dry oven at 80 degrees C to obtain the desired product.