Resin composition for surface treatment of steel sheet and surface-treated steel sheet using the same

Patent metadata

Field	Value
Publication number	US-9228111-B2
Application number	US-200913141110-A
Country	US
Kind code	B2
Filing date	Oct 29, 2009
Priority date	Nov 5, 2008
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

Provided is a resin composition for surface treatment of a steel sheet including a binder resin, graphene and a solvent. More particularly, as only a small amount of the graphene is included in the resin composition used for surface treatment of a steel sheet, a user-required electrical conductivity can be provided to the steel sheet.

First claim

The invention claimed is:

1. A surface-treated steel sheet having a resin layer formed by coating a resin composition for surface treatment of a steel sheet comprising a binder resin, a graphene, and a solvent,
wherein the binder resin is a urethane resin,
wherein the urethane resin includes 5 to 95 parts by weight of a soft urethane-based resin and 5 to 95 parts by weight of a hard urethane-based resin based on a solid content of the urethane resin,
wherein the soft urethane-based resin is a polyurethane resin prepared from isophorone diisocyanate, dibasic acid, and polyvalent alcohol; or a polyurethane resin prepared from acryl polyol and polyisocyanate,
wherein the soft urethane-based resin has a number average molecular weight of 5,000 to 300,000,
wherein the hard urethane-based resin is a polyurethane resin prepared from 4,4′-bis(ω-hydroxyalkyleneoxy)biphenyl and methyl-2,6-diisocyanatehexanoate,
wherein the hard urethane-based resin has a number average molecular weight of 200,000 to 2,000,000,
wherein the hard urethane-based resin has a Shore A hardness of 40 to 90,
wherein the graphene is surface-treated with at least one hydrophilic functional group,
wherein the hydrophilic functional group is COOH or COO − , and
wherein the resin layer has a thickness of 2.5 μm or less.

2. The surface-treated steel sheet of claim 1 , wherein the resin layer has an adhering amount after drying of 300 to 2,500 mg/m 2 .

3. The surface-treated steel sheet of claim 1 , wherein the resin composition comprises 10 to 90 parts by weight of the binder resin, 0.01 to 0.5 parts by weight of the graphene, and 9 to 90 parts by weight of the solvent based on a total weight of the resin composition used for surface treatment of the steel sheet.

4. The surface-treated steel sheet of claim 1 , wherein the solvent is water, an alcohol solvent, an alkali-based aqueous solution, or a combination thereof.

5. The surface-treated steel sheet of claim 1 , wherein the resin composition further comprises, based on the total solid content of the resin composition used for surface treatment of the steel sheet:
5 to 25 parts by weight of an additive composed of a wetting agent, a crosslinking agent, a lubricant, a foaming agent, or a combination thereof; and
0.05 to 1.0 parts by weight of a surfactant.

Assignees

• Cho Jae Dong
• Lee Jae Soon
• Lee Jae Ryung
• Shim Sang Eun
• Posco

Inventors

• Cho Jae Dong
• Lee Jae Soon
• Lee Jae Ryung
• Shim Sang Eun

Classifications

• C08G18/3215

  containing aromatic groups or benzoquinone groups · CPC title

• Y10T428/31678

  Of metal · CPC title

• C08K3/04

  Carbon · CPC title

• C08G18/4277

  Caprolactone and/or substituted caprolactone · CPC title

• C08G18/44

  Polycarbonates · CPC title