The invention discloses a method for preparing a
sodium polystyrenesulfonate / multi-wall
carbon nanotube (PSS / MWNTs) composition. The method comprises the following steps: putting 50mg of multi-wall carbon nanotubes into 60mL of deionized water, performing
ultrasonic dispersion, adding 5g of
sodium p-styrenesulfonate, stirring for 8 hours at normal temperature, adding 50mg of
potassium peroxodisulfate, stirring for 48 hours at 65 DEG C in the presence of
argon, and after the stirring is completed, performing
centrifugation treatment to remove irregular carbon and a catalyst; and filtering supernate by using a filtering membrane of 0.2mu m, removing ungrafted
sodium polystyrenesulfonate (PSS), and performing freeze-
drying on the obtained
solid, thereby obtaining the PSS / MWNTs composition. According to the method, the surfaces of MWNTs are coated by PSS in a covalence manner through in-situ
polymerization, a great amount of negative charges are introduced to the surfaces of the nanotubes,a spatial expelling function is achieved, stable dispersion of the nanotubes in high-concentration
saline water and API (American
Petroleum Association)
saline water is achieved. By adopting the method, a base is made for application of the multi-wall carbon nanotubes in the
petroleum industry.