Composition for surface treating of steel sheet, steel sheet using same, and manufacturing method of same

Patent metadata

Field	Value
Publication number	US-12325809-B2
Application number	US-202017781919-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Dec 3, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

The present disclosure provides a solution composition having excellent acid corrosion resistance and adhesion to a steel sheet, a steel sheet surface-treated using the solution composition, and a method for manufacturing the steel sheet. Specifically, the present disclosure provides a solution composition for treating a surface of a steel sheet, the solution composition containing colloidal silica, alkoxy silane, a solvent, an acidity regulator, an acrylate-based monomer, an adhesion improver including a backbone formed of siloxane bonds, and a metal chelate curing agent, a steel sheet surface-treated using the solution composition, and a method for manufacturing the steel sheet.

First claim

The invention claimed is:

1. A solution composition for treating a surface of a steel sheet comprising:
15 to 50 wt % of colloidal silica;
20 to 60 wt % of alkoxy silane;
1 to 40 wt % of a solvent;
0.01 to 1.00 wt % of an acidity regulator;
5 to 15 wt % of an acrylate-based monomer;
0.1 to 3.0 wt % of a metal chelate curing agent; and
5 to 50 wt % of an adhesion improver including a backbone formed of siloxane bonds,
wherein the adhesion improver is a silicone resin,
wherein a ratio of silicon dioxide in the adhesion improver is 20 to 80 mol %, and
wherein a weight average molecular weight of the adhesion improver is 300 g/mol to 30,000 g/mol.

2. The solution composition for treating a surface of a steel sheet of claim 1 , wherein a particle size of the colloidal silica is 5 nm to 50 nm.

3. The solution composition for treating a surface of a steel sheet of claim 1 , wherein the alkoxy silane includes three or more alkoxy groups, and is one or more selected from the group consisting of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri-isopropoxy silane, 3-methacryloxypropyl trimethoxy silane, 2-glycidyloxy propyltrimethoxy silane, 2-glycidyloxy propyltriethoxy silane, 2-aminopropyl triethoxy silane, 2-ureidoalkyl triethoxy silane, tetraethoxysilane, triethoxyphenylsilane, and trimethoxyphenylsilane.

4. The solution composition for treating a surface of a steel sheet of claim 1 , wherein the solvent is one or more selected from the group consisting of methanol, ethanol, 2-propanol, 2-methoxypropanol, 2-butoxyethanol, water, dimethylformamide, diglyme, 2-aminoethanol, 1-heptanol, propylene glycol, dimethyl sulfoxide, ethylene glycol, diethylene glycol, glycerin, di(propylene glycol) methyl ether, diethylene glycol monomethyl ether, ethylene glycol mono-n-propyl ether, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate.

5. The solution composition for treating a surface of a steel sheet of claim 1 , wherein the acidity regulator is an organic acid, an inorganic acid, or a mixed acid thereof.

6. The solution composition for treating a surface of a steel sheet of claim 1 , wherein the acrylate-based monomer is at least one selected from the group consisting of acrylic acid glacial, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isobutyl acrylate, tertiary-butyl acrylate, tertiary-butyl methacrylate, butanediol monoacrylate, lauryl acrylate, dimethylaminoethyl acrylate, and dihydrodicyclopentadienyl acrylate.

7. The solution composition for treating a surface of a steel sheet of claim 1 , wherein the metal chelate contains one or more selected from the group consisting of metal chelates containing aluminum, titanium, zirconium, or tin, and a mixture thereof.

8. The solution composition for treating a surface of a steel sheet of claim 1 , further comprising 0.1 to 5.0 wt % of an organic resin, wherein the organic resin is at least one selected from the group consisting of polyvinyl alcohol, poly(meth)acrylic acid, a copolymer of acrylic acid and methacrylic acid, a copolymer of ethylene and an acrylic monomer, a copolymer of ethylene and vinyl acetate, polyurethane, an amino-modified phenolic resin, a polyester resin, and an epoxy resin.

9. A method for manufacturing a surface-treated steel sheet, the method comprising:
providing a steel sheet;
subjecting the steel sheet to a treatment with the composition of claim 1 ; and
subjecting the steel sheet treated with the composition to a heat treatment.

10. The method for manufacturing a surface-treated steel sheet of claim 9 , wherein the heat treatment is performed at 150 to 550° C.

11. A surface-treated steel sheet comprising:
a steel sheet; and
a coating layer formed of the composition of claim 1 , the coating layer being formed on the steel sheet.

12. The surface-treated steel sheet of claim 11 , wherein a thickness of the coating layer is 5 to 55 μm.

Assignees

• Posco
• Noroo Coil Coatings Co Ltd

Inventors

• Choi Chang-Hoon
• Son Won-Ho
• Bang Chan-Seok
• Ko Jae-Duck

Classifications

• B05D2202/10

  based on Fe · CPC title

• C09D183/06 Primary

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title

• C09D5/08

  Anti-corrosive paints · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title