Method for manufacturing carbon nanotube-blended aggregate

Patent metadata

Field	Value
Publication number	US-12129354-B2
Application number	US-202017635463-A
Country	US
Kind code	B2
Filing date	Aug 13, 2020
Priority date	Aug 16, 2019
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A method for manufacturing a carbon nanotube-blended aggregate of the present invention includes the steps of: (1) providing an aqueous solution of a water-soluble polymer having a concentration of 0.005 to 3.0% by mass; (2) impregnating carbon nanotubes with the aqueous solution of the water-soluble polymer in a proportion of 400 to 1,000 parts by mass relative to 100 parts by mass of the carbon nanotubes to prepare a wet aggregate; (3) shear-crushing the wet aggregate to obtain an aggregate of crushed products and (4) drying the aggregate of the crushed products to obtain a carbon nanotube-blended aggregate containing the water-soluble polymer.

First claim

The invention claimed is:

1. A method for manufacturing a carbon nanotube-blended aggregate, comprising the steps of:
(1) providing an aqueous solution of a water-soluble polymer having a concentration of 0.005 to 3.0% by mass;
(2) impregnating carbon nanotubes with the aqueous solution of the water-soluble polymer in a proportion of 400 to 1,000 parts by mass relative to 100 parts by mass of the carbon nanotubes to prepare a wet aggregate;
(3) shear-crushing the wet aggregate to obtain an aggregate of crushed products and
(4) drying the aggregate of the crushed products to obtain a carbon nanotube-blended aggregate comprising the water-soluble polymer.

2. The method according to claim 1 , wherein the wet aggregate preparation step (1) is continuously carried out using a screw conveyor.

3. The method according to claim 1 , wherein the wet aggregate has a water content, at room temperature, of 600 to 980 parts by mass based on 100 parts by mass of the carbon nanotubes.

4. The method according to claim 1 , wherein the water-soluble polymer is polydiallyldimethylammonium chloride.

5. The method according to claim 1 , wherein the shear-crushing treatment in step (3) is continuously performed using a cutter mill.

6. The method according to claim 5 , wherein the cutter mill is a multi-stage cutter mill.

7. The method according to claim 1 , wherein the drying step (4) is carried out by hot air drying.

8. The method according to claim 1 , wherein the carbon nanotube-blended aggregate has a bulk density of 0.15 to 0.30 g/cm 3 .

9. The method according to claim 1 , wherein the carbon nanotube-blended aggregate has an average particle size of 0.5 to 2.0 mm.

10. The method according to claim 1 , wherein the carbon nanotube-blended aggregate has a porosity of 15 to 30%.

Assignees

• Zeon Corp

Inventors

• Yamamoto Hirofumi

Classifications

• C08K9/08

  Ingredients agglomerated by treatment with a binding agent · CPC title

• C08J2300/14

  Water soluble or water swellable polymers, e.g. aqueous gels · CPC title

• C08J3/21

  the polymer being premixed with a liquid phase · CPC title

• C08J2339/04

  Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member · CPC title

• C08J3/16 Primary

  by coagulating dispersions {(C08J3/122 takes precedence)} · CPC title