Entangled-type carbon nanotubes and method for preparing the same

Patent metadata

Field	Value
Publication number	US-11618679-B2
Application number	US-201816628555-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Dec 26, 2017
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

The present invention relates to entangled-type carbon nanotubes which have a bulk density of 31 kg/m3 to 85 kg/m3 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.

First claim

The invention claimed is:

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.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sung Jin
• Cho Dong Hyun
• Yoon Jae Keun
• Kim Tae Hyung
• Kim Og Sin

Classifications

• C01B2202/26

  Mechanical properties · CPC title

• C01P2006/11

  Powder tap density · CPC title

• C01P2006/10

  Solid density · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• B01J37/0219

  the coating containing organic compounds · CPC title