▎ 摘　　要

NOVELTY - Preparation for graphene/dodecyl benzene sulfonic acid-modified carbon nanotubes/polythiophene composite wave-absorbing additive involves adding 0.20-0.40 g graphene, 0.20-0.40 g dodecyl benzene sulfonic acid-modified carbon nanotubes and 2 mL thiophene monomer into 80 mL chloroform, ultrasonically stirring for 30 minutes, adding 8 g anhydrous ferric chloride into resultant mixture, stirring for 10 hours, filtering, washing obtained filtrate using methanol, further washing with deionized water until the filtrate is yellow, and vacuum-drying obtained product at 60 degrees C for 24 hours. USE - Preparation for composite wave-absorbing additive (claimed). ADVANTAGE - The preparation of composite wave-absorbing additive has excellent electromagnetic property. DETAILED DESCRIPTION - Preparation for graphene/dodecyl benzene sulfonic acid-modified carbon nanotubes/polythiophene composite wave-absorbing additive involves adding 1 g multi-wall carbon nanotubes into aqueous solution, ultrasonically-dispersing for 1 hour, adding 2 g dodecyl benzene sulfonic acid into resultant mixture, placing resultant mixture in ice bath for 2.5 hours, washing obtained reaction product using deionized water, and drying under vacuum at 50 degrees C to obtain dodecyl benzene sulfonic acid-modified carbon nanotubes, mixing 1 g graphite flakes, 0.5 g sodium nitrate and 25 mL concentrated sulfuric acid under ice-cooling, adding 3 g potassium permanganate into resultant mixture, stirring at 10 degrees C for 1 hour, further stirring at 35 degrees C for 0.5 hour, adding 50 mL deionized water into resultant mixture, stirring at 100 degrees C or less for 0.5 hour, further adding 200 mL deionized water and 10 mL 30% hydrogen peroxide, aging, removing supernatant, adding 100 mL anhydrous ethanol to resultant mixture, stirring, aging, removing supernatant, dispersing obtained graphene oxide suspension in 100 mL ethanol, carrying out ultrasonic treatment for 30 minutes, adding 50 mL hydrazine hydrate and 50 mL ammonia into resultant mixture, mixing, refluxing at 95 degrees C for 1 hour, filtering, washing obtained filter cake using ethanol for 3-4 times, drying at 60 degrees C under vacuum and grinding to obtain graphene, adding 0.20-0.40 g graphene, 0.20-0.40 g dodecyl benzene sulfonic acid-modified carbon nanotubes and 2 mL thiophene monomer into 80 mL chloroform, ultrasonically stirring for 30 minutes, adding 8 g anhydrous ferric chloride into resultant mixture, stirring for 10 hours, filtering, washing obtained filtrate using methanol, further washing with deionized water until the filtrate is yellow, and vacuum-drying obtained product at 60 degrees C for 24 hours. The mass ratio of carbon nanotubes and dodecyl benzene sulfonic acid is 1:2.