# US 10,246,780 B2 · Non-combustible color steel sheet for household appliances and building materials and method for manufacturing same

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- Number: US 10,246,780 B2
- Document ID: US10246780B2
- Status: Granted
- Kind: B2
- Application number: 15/165,835
- Filed: 2014-08-26
- Published: 2016-10-27
- Granted: 2019-04-02
- Earliest claimed: 2013-11-27
- Assignees: Hyundai Steel Company
- Applicants: Hyundai Steel Company
- Inventors: Jong-Mun Jang; Min-Yeong Jeong; Hye-Ri Kim; Yong-Soo Jeong; Yong Hee Kim
- Web page: https://patentgrep.com/patent/US10246780B2

## CPC

- C23C 28/00: Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- B05D 7/52: {Two layers}
- B05D 7/546: {each layer being cured, at least partially, separately}
- C09D 5/004: {Reflecting paints; Signal paints}
- C09D 5/18: Fireproof paints {including high temperature resistant paints}
- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/26: After-treatment (C23C2/14 takes precedence)
- C25D 3/22: of zinc
- C25D 7/0614: {Strips or foils}
- B05D 5/00: Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D 2202/10: based on Fe
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

An incombustible color-coated steel sheet for household appliances and building materials and a method for manufacturing the same, includes a flame-retardant coating composition that is a colored coating composition coated on a base steel sheet so that the coated steel sheet can have more than a certain level of flame-retardant properties and can also exhibit excellent physical properties, including processability, coating adhesion, corrosion resistance, and hardness.

## Claims

### Claim 1

A method for manufacturing an incombustible color-coated steel sheet, comprising the steps of:
(a) applying an under-coating agent to a base steel sheet, followed by heat drying, thereby forming a pretreatment layer;
(b) applying a primer coating composition to the pretreatment layer, followed by heat drying, thereby forming a primer layer; and
(c) applying a flame-retardant coating composition to the primer layer, followed by drying and curing at a temperature of 200° C., thereby forming a flame-retardant coating layer, the flame- retardant coating composition comprising, based on 100 parts by weight of the flame-retardant coating composition, 15-20 parts by weight of silica sol, 5-15 parts by weight of polyurethane resin, 40-70 parts by weight of a solvent, 1-3 parts by weight of an acid catalyst, 0.1-2.0 parts by weight of an acid stabilizer, and 5-20 parts by weight of a pigment,
wherein the flame-retardant coating layer has a thickness of 5 to 10 μm.

### Claim 2 (depends on 1)

The method of claim 1, wherein the primer layer in step (b) comprises 50-60 wt % of the primer layer being polyester resin, 25-30 wt % of the primer layer being colloidal silica, 0.5-2.0 wt % of the primer layer being an epoxy-activating phosphoric acid compound, 0.5-1.0 wt % of the primer layer being a silane coupling agent, 0.1-10 wt % of the primer layer being at least one anti-corrosive agent selected from the group consisting of titanium sol, silica sol and zirconium sol, and 0.01-0.20 wt % of the primer layer being a wetting agent,
wherein the epoxy activating phosphoric acid compound comprises any one selected from the group consisting of 1-hydroxyethylene-1,1-diphosphonic acid, ammonium phosphate, sodium phosphate monobasic, sodium phosphate dibasic, sodium phosphate tribasic, and zinc phosphate,
wherein the epoxy-activating phosphoric compound activates epoxy groups of the silane coupling agent, and
wherein the silane coupling agent is any one selected from the group consisting of 3-aminopropyltriepoxysilane, N-(1,3 -dimethylbutylidene)-3 -(triepoxysilane)-1-propaneamine, 3-glycidoxypropyltrimethoxysilane, 3-methaglycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and γ-glycidoxytrimethyldimethoxysilane.

### Claim 3 (depends on 2)

The method of claim 2, wherein the polyester resin and the colloidal silica are added at a weight ratio of 1.5:1 to 2.5:1.

### Claim 4 (depends on 1)

The method of claim 1, wherein the primer layer in step (b) is dried at a first heat-drying temperature (peak metal temperature (PMT)) of 120 to 200° C.

### Claim 5 (depends on 1)

The method of claim 1, wherein the pigment is at least one selected from the group consisting of TiO2, P2O5, Al2O3, CaO, carbon black, and inorganic ceramic pigments.

### Claim 6 (depends on 1)

The method of claim 1, wherein the heat drying in step (c) is performed by one or more selected from the group consisting of hot-air heating, induction heating, and far-infrared heating.

### Claim 7

An incombustible color-coated steel sheet comprising:
a base steel sheet;
a pretreatment layer coated on the base steel sheet;
a primer layer coated on the pretreatment layer; and
a flame-retardant coating layer coated on the primer layer, the flame-retardant coating layer formed from a flame-retardant coating composition comprising, based on 100 parts by weight of the flame-retardant coating composition, 15-20 parts by weigh of silica sol, 5-15 parts by weight of polyurethane resin, 40-70 parts by weight of a solvent, 1-3 parts by weight of an acid catalyst, 0.1-2.0 parts by weight of an acid stabilizer, and 5-20 parts by weigh of a pigment,
wherein the flame-retardant coating layer has a thickness of 5 to 10 μm,
wherein the flame-retardant coating layer is formed by applying a flame-retardant coating composition, followed by drying and curing at a temperature of 200° C. to 250° C.

### Claim 8 (depends on 7)

The incombustible color-coated steel sheet of claim 7, wherein the pigment is at least one selected from the group consisting of TiO2, P2O5, Al2O3, CaO, carbon black, and inorganic ceramic pigments.

### Claim 9 (depends on 7)

The incombustible color-coated steel sheet of claim 7, wherein the primer layer comprises 50-60 wt % of the primer layer being polyester resin, 25-30 wt % of the primer layer being colloidal silica, 0.5-2.0 wt % of the primer layer being an epoxy-activating phosphoric acid compound, 0.5-1.0 wt % of the primer layer being a silane coupling agent, 0.1-10 wt % of the primer layer being at least one anti-corrosive agent selected from the group consisting of titanium sol, silica sol and zirconium sol, and 0.01-0.20 wt % of the primer layer being a wetting agent,
wherein the epoxy-activating phosphoric compound activates epoxy groups of the silane coupling agent, and
wherein the silane coupling agent is any one selected from the group consisting of 3-aminopropyltriepoxyslane, N-(1,3 -dimethylbutylidene)-3 -(triepoxysilane)-1-propaneamine, 3-glycidoxypropyltrimethoxysilane, 3-methaglycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and γ-glycidoxytrimethyldimethoxysilane.

### Claim 10 (depends on 7)

The incombustible color-coated steel sheet of claim 7, wherein the primer layer has a thickness of 0.3-1.0 μm.