Dispersing agent, its preparation method and dispersed composition of carbon-based material comprising the same

Patent metadata

Field	Value
Publication number	US-10569243-B2
Application number	US-201414903121-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Aug 1, 2013
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

The present invention relates to a novel dispersing agent capable of uniformly dispersing a variety of carbon-based materials in different media including aqueous solvents and a preparation method thereof, and a carbon-based material-dispersed composition including the same. The dispersing agent is a mixture of a plurality of polyaromatic hydrocarbon oxides, and the mixture includes polyaromatic hydrocarbon oxide having a molecular weight of 300 to 1000 in an amount of 60% by weight or more.

First claim

The invention claimed is:

1. A dispersed composition, comprising:
a dispersing agent, and
a carbon-based material;
wherein the dispersing agent comprises a mixture of a plurality of polyaromatic hydrocarbon oxides,
wherein the mixture includes polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in an amount of 70 to 95% by weight,
wherein the polyaromatic hydrocarbon oxides have a structure in which one or more oxygen-containing functional groups bind to aromatic hydrocarbons containing 5 to 30 benzene rings,
wherein an oxygen content is 12 to 50% by weight based on a total element content, when the plurality of polyaromatic hydrocarbon oxides in the mixture are subjected to elemental analysis, and
wherein the carbon-based materials are one or more selected from the group consisting of graphene, carbon nanotube, graphite, carbon black, a fullerene-based material and a derivative thereof,
wherein the oxygen-containing functional group includes one or more selected from the group consisting of a hydroxyl group, an epoxy group, a carboxyl group, a nitro group and a sulfonic group.

2. The dispersed composition of claim 1 , wherein the aromatic hydrocarbon has 7 to 20 benzene rings in its structure.

3. A preparation method of the dispersed composition of claim 1 , comprising oxidizing a mixture of polyaromatic hydrocarbons having a molecular weight of 200 to 1500 in the presence of an oxidizing agent,
forming a dispersing agent,
dispersing the dispersing agent in a solvent,
adding a carbon-based material, and
forming the dispersed composition of claim 1 ,
wherein the oxidizing agent includes one or more selected from the group consisting of nitric acid (HNO 3 ), sulfuric acid (H 2 SO 4 ), hydrogen peroxide (H 2 O 2 ), ammonium cerium (IV) sulfate ((NH 4 ) 4 Ce(SO 4 ) 4 ) and ammonium cerium (IV) nitrate ((NH 4 ) 2 Ce(NO 3 ) 6 ).

4. The method of claim 3 , wherein the mixture of polyaromatic hydrocarbonshaving a molecular weight of 200 to 1500 includes a plurality of aromatic hydrocarbons containing 5 to 50 benzene rings.

5. The method of claim 3 , wherein the oxidation step is performed in an aqueous solvent at a reaction temperature of 10 to 90° C. for 0.5 to 20 hours.

6. The method of claim 3 , wherein the mixture of polyaromatic hydrocarbons having a molecular weight of 200 to 1500 is derived from pitch obtained from fossil fuels or products thereof.

7. The method of claim 3 , further comprising purifying a resultant after the oxidation step so as to obtain a mixture of a plurality of polyaromatic hydrocarbon oxides.

8. The method of claim 7 , wherein the purifying includes centrifuging the resultant of the oxidation step.

Assignees

• Lg Chemical Ltd

Inventors

• Sohn Kwon Nam
• Kwon Won Jong
• Lee Kil Sun
• Kim In Young
• Youn Yeu Young
• Park Hee Yong

Classifications

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C08K3/04

  Carbon · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C09C1/48

  Carbon black · CPC title

• C08K3/046

  Carbon nanorods, nanowires, nanoplatelets or nanofibres · CPC title