Carbon nanotube aqueous dispersion, lubricating oil composition and grease composition, and their manufacturing method

摘要

PROBLEM TO BE SOLVED: To provide an aqueous dispersion of carbon nanotubes having a high concentration of carbon nanotubes and a low viscosity. SOLUTION: This is a carbon nanotube aqueous dispersion containing surface-oxidized carbon nanotubes, and the concentration of the surface-oxidized carbon nanotubes in the carbon nanotube aqueous dispersion is 4.0 to 6.0% by mass. The D50 of the surface-oxidized carbon nanotubes in the dispersion particle size measurement is 200 nm or less, the D90 is 500 nm or less, and the value of (D90-D50) / D50 is 1.10 or less, and the surface oxidation treatment. The carbon nanotubes have an acid value of 1.30 mmol / g or more, and the aqueous dispersion of carbon nanotubes has a viscosity of 5.00 mPa · s or less at a ^{shear rate of 383 s-1 at 25 ° C.} Aqueous dispersion of nanotubes. [Selection diagram] None