Entangled-type carbon nanotubes and method for preparing the same
The present invention relates to entangled-type carbon nanotubes which have a bulk density of 31 kg/m 3 to 85 kg/m 3 and a ratio of tapped bulk density to bulk density of 1.37 to 2.05, and a method for preparing the entangled-type carbon nanotubes.
1. Entangled-type carbon nanotubes in which carbon nanotube units are entangled but without a uniform bundle or a rope shape, which have a bulk density of 31 kg/m 3 to 85 kg/m 3 and satisfies the following Equation 1:
1.37 ≤X/Y≤ 2.05 <Equation 1>
wherein, in Equation 1, X denotes a tap density (units: kg/m 3 ) of the entangled-type carbon nanotubes, and
Y denotes a bulk density (units: kg/m 3 ) of the entangled-type carbon nanotubes.
2. The entangled-type carbon nanotubes of claim 1 , wherein carbon nanotubes satisfy the following Equation 1:
1.4 ≤X/Y≤ 2.0. <Equation 1>
3. The entangled-type carbon nanotubes of claim 1 , wherein the bulk density of the entangled-type carbon nanotubes is 32 kg/m 3 to 80 kg/m 3 .
4. The entangled-type carbon nanotubes of claim 1 , wherein the tapped bulk density of the entangled-type carbon nanotubes is 63 kg/m 3 to 116 kg/m 3 .
5. The entangled-type carbon nanotubes of claim 1 , wherein the entangled-type carbon nanotubes have a maximum dispersion concentration of 3.3 wt % or more.
6. Entangled-type carbon nanotubes which have a bulk density of 31 kg/m 3 to 85 kg/m 3 and satisfies the following Equation 1:
1.37≤ X/Y≤ 2.05 <Equation 1>
wherein, in Equation 1, X denotes a tap density (units: kg/m 3 ) of the entangled-type carbon nanotubes, and
Y denotes a bulk density (units: kg/m 3 ) of the entangled-type carbon nanotubes,
wherein the entangled-type carbon nanotubes comprise carbon nanotube units having an average diameter of 10 nm to 30 nm,
wherein the carbon nanotube units have an interlayer distance (d 002 ) of a carbon crystal of 0.335 nm to 0.342 nm, wherein the interlayer distance is obtained by X-ray diffraction,
satisfy the following condition: interlayer distance (d 002 )<0.3448-0.0028 (log φ) wherein φ is an average diameter of the carbon nanotube units, and
have a thickness (Lc) in a C-axis direction of the crystal of 40 nm or less.
7. Entangled-type carbon nanotubes which have a bulk density of 31 kg/m 3 to 85 kg/m 3 and satisfies the following Equation 1:
1.37≤ X/Y≤ 2.05 <Equation 1>
wherein, in Equation 1, X denotes a tap density (units: kg/m 3 ) of the entangled-type carbon nanotubes, and
Y denotes a bulk density (units: kg/m 3 ) of the entangled-type carbon nanotubes,
wherein the entangled-type carbon nanotubes have a powder resistance of 0.0171 Ω·cm or less.