Non-combustible color steel sheet for household appliances and building materials and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2016312367-A1
Application number	US-201415165835-A
Country	US
Kind code	A1
Filing date	Aug 26, 2014
Priority date	Nov 27, 2013
Publication date	Oct 27, 2016
Grant date	—

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.

First 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 to the primer layer a flame-retardant coating composition comprising, based on 100 parts by weight, 15-20 parts by weight of silica sol, 5-15 parts by weight of polyurethane resin, 40-70 parts by weight of a solvent, 5-15 parts by weight of deionized water (DIW), 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, followed by drying and curing, thereby forming a flame-retardant coating layer.

2 . The method of claim 1 , wherein the primer layer in step (b) comprises 50-60 wt % of polyester resin, 25-30 wt % of colloidal silica, 0.5-2.0 wt % of an epoxy-activating phosphoric acid compound, 0.5-1.0 wt % of a silane coupling agent, 0.1-10 wt % of at least one anti-corrosive agent selected from among titanium sol, silica sol and zirconium sol, and 0.01-0.20 wt % of a wetting agent.

3 . 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.

4 . 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.

5 . The method of claim 1 , wherein the silica sol in step (c) is obtained by hydrolyzing a compound, selected from among alkoxysilanes, including tetraethoxysilane (TEOS) and tetraethoxysilane (TMOS), with water in a weakly acidic atmosphere (pH 4-5), and adding 20 parts by weight or less of solid urethane solid to 100 parts by weight of a product from the hydrolysis, followed by reaction at a temperature of 60 to 80° C.

6 . The method of claim 1 , wherein the pigment is at least one selected from among TiO 2 , P 2 O 5 , Al 2 O 3 , CaO, carbon black, and inorganic ceramic pigments.

7 . The method of claim 1 , wherein the flame-retardant coating layer in step (d) is dried and cured at a second heat-drying temperature (peak metal temperature (PMT)) of 200 to 250° C.

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

9 . 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 and comprising, based on 100 parts by weight, 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.

10 . The incombustible color-coated steel sheet of claim 9 , wherein the pigment is at least one selected from among TiO 2 , P 2 O 5 , Al 2 O 3 , CaO, carbon black, and inorganic ceramic pigments.

11 . The incombustible color-coated steel sheet of claim 9 , wherein the primer layer in step (b) comprises 50-60 wt % of polyester resin, 25-30 wt % of colloidal silica, 0.5-2.0 wt % of an epoxy-activating phosphoric acid compound, 0.5-1.0 wt % of a silane coupling agent, 0.1-10 wt % of at least one anti-corrosive agent selected from among titanium sol, silica sol and zirconium sol, and 0.01-0.20 wt % of a wetting agent.

12 . The incombustible color-coated steel sheet of claim 9 , wherein the primer layer has a thickness of 0.3-1.0 μm.

13 . The incombustible color-coated steel sheet of claim 9 , wherein the flame-retardant coating layer has a thickness of 5-10 μm.

Assignees

• Hyundai Steel Co

Inventors

• Jang Jong-Mun
• Jeong Min-Yeong
• Kim Hye-Ri
• Jeong Yong-Soo
• Kim Yong Hee

Classifications

• C25D3/22

  of zinc · CPC title

• C09D5/18

  Fireproof paints {including high temperature resistant paints} · CPC title

• C23C28/00 Primary

  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 · CPC title

• B05D7/52

  Two layers · CPC title

• B05D7/546

  each layer being cured, at least partially, separately · CPC title