WO2016105078A1 - 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물 및 표면처리 강판 - Google Patents
내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물 및 표면처리 강판 Download PDFInfo
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- WO2016105078A1 WO2016105078A1 PCT/KR2015/014086 KR2015014086W WO2016105078A1 WO 2016105078 A1 WO2016105078 A1 WO 2016105078A1 KR 2015014086 W KR2015014086 W KR 2015014086W WO 2016105078 A1 WO2016105078 A1 WO 2016105078A1
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- coating composition
- chromium
- free coating
- resistance
- blackening
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
- C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
- C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5096—Polyethers having heteroatoms other than oxygen containing silicon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Definitions
- the present invention relates to a chromium-free coating composition and a surface treated steel sheet excellent in blackening resistance and corrosion resistance.
- Magnesium alloy plated steel sheets and magnesium plates such as Zn-Al-Mg, Zn-Al-Mg-Si, Zn-Mg, Mg / Zn, Al-Mg, Al-Mg-Si, etc. are excellent in corrosion resistance, but during transportation and storage Black side which the surface of a steel plate changes to black by oxygen and water vapor in air tends to generate
- Such black stools occur due to the conversion of magnesium and zinc present in the surface layer of the steel sheet to a composite hydroxide or oxide when the plated steel sheet containing magnesium contacts moisture.
- the black side deteriorates the appearance quality of the product, and the degree of cracking of the processed portion due to the difference in hardness between magnesium and zinc is remarkable, thereby degrading workability.
- a method of imparting black resistance to the surface of a magnesium steel sheet or a magnesium alloy plated steel sheet by an oil treatment, an anode film formation, or an organic film formation method has been widely performed.
- oiling treatment there is a limit that it is difficult to expect improvement in blackening resistance due to long-term preservation.
- the method of forming the anode film is difficult to secure stability by using a lot of strong inorganic acids dangerous to the environment and the human body, there is a limitation in applying to a continuous production line because the work is complicated and takes a lot of work time.
- the method of forming the organic film has a disadvantage in that a high temperature is required for forming the film and a lot of time is required to dry the formed film.
- Korean Patent Application Publication No. 2007-0082367 discloses an anode coating treatment method for surface treating a magnesium alloy product in a total of ten steps.
- the method disclosed in this patent document is surface-treated in the form of parts other than steel sheets, and there are problems in that it is not economical because many processing steps and time-consuming processes are required.
- US Patent Publication No. 2010-7754799 discloses a method for improving the chemical resistance of magnesium alloy steel sheet with organopolysilane, non-reactive silicone oil, silane treated zinc oxide and the like.
- Japanese Laid-Open Patent Publication No. 1997-241828 discloses a technique for preventing surface blackening by immersing a Zn-Mg plating layer in a phosphoric acid pickling bath having a phosphoric acid concentration of 0.01 to 30% by weight to lower the magnesium concentration of the plating layer surface portion.
- the pickling treatment loses the gloss and surface appearance inherent in the Zn-Mg plated steel sheet, and the sludge of the pickling treatment region by the pickling treatment must be treated.
- the present invention improves the blackening resistance, corrosion resistance and workability of a magnesium-containing steel sheet, and provides a coating composition using a strong oxidizing agent such as a fluorine compound and heavy metal-based chromium and a steel sheet on which a coating layer is formed.
- a strong oxidizing agent such as a fluorine compound and heavy metal-based chromium
- the silane-modified water-dispersed polyurethane may have a number average molecular weight of 10,000 to 60,000.
- the silane-modified water-dispersed polyurethane the total amount of the organosilane relative to the total silane-modified water-dispersed polyurethane may be 1 to 5% by weight.
- the organosilane may be a compound having a structure of the following formula.
- x is an integer of 1 to 2
- y and z is an integer of 1 to 3.
- the organosilane is N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3 At least one selected from -aminopropyltriethoxysilane and N- (2-aminoethyl) -3-aminopropyltripropoxysilane.
- the curing agent is 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltripropylsilane, 3-glycidoxypropyltriisoflophyllsilane, 2- ( One or more selected from 3,4 epoxycyclohexyl) ethyltrimethoxysilane and 2- (3,4 epoxycyclohexyl) ethyltriethoxysilane.
- the blackening agent may be at least one selected from nickel compounds, vanadium compounds, zirconium compounds, cerium compounds and molybdenum compounds.
- the rust inhibitor may be at least one selected from lithium silicate, sodium silicate and potassium silicate.
- the rust inhibitor, the total amount of the rust inhibitor, the metal content may be 0.1 to 2% by weight.
- the coating layer may have a dry coating amount of 300 to 1200 mg / m2.
- the chrome-free coating composition may have a curing temperature of 70 to 180 °C.
- the chromium-free coating composition of the present invention has the effect of improving the blackening resistance, corrosion resistance, alkali resistance, solvent resistance and fingerprint resistance of the steel sheet on which the coating layer including the composition is formed.
- One embodiment of the present invention relates to a chromium-free coating composition excellent in blackening resistance and corrosion resistance, specifically 20 to 70% by weight of the silane-modified water-dispersed polyurethane, 0.5 to 5% by weight of curing agent, 0.5 to 5% by weight of blackening agent It is possible to provide a chromium-free coating composition having excellent blackening resistance and corrosion resistance, including 0.5 to 5 wt% of a rust preventive agent, 0.5 to 5 wt% of a lubricant, and a residual solvent.
- the silane-modified water-dispersed polyurethane is a polyurethane having a water-dispersible form, and organosilane may be used as a chain extender. It is preferable that the silane-modified water-dispersed polyurethane has a number average molecular weight of 10,000 to 60,000, and if the number average molecular weight is less than 10,000, the molecular weight is too small to easily fall off or dissolve after drying, which is not suitable for coating coatings. If the average molecular weight exceeds 60,000, even if water dispersion is made, the particles are too large to form a homogeneous coating layer.
- the content of the silane-modified water-dispersed polyurethane is preferably 20 to 70% by weight, and if the content is less than 20% by weight, the external corrosion factor may not be sufficiently inhibited from penetrating the surface of the plated steel sheet, resulting in poor corrosion resistance and adhesion. If it exceeds 70% by weight, the content of the hardening agent, blackening agent, rust preventive agent, and lubricant having other functions is insufficient, so that it is difficult to obtain a desired complex function.
- the water-dispersed polyurethane that does not contain the silane modified from the silane-modified water-dispersed polyurethane can be prepared by conventional methods. For example, it can manufacture using polyols, such as a non-yellowing polycarbonate diol or polyester diol, dimethylol propionic acid, a yellowing isocyanate monomer, the organic amine for neutralization, water, etc.
- polyols such as a non-yellowing polycarbonate diol or polyester diol, dimethylol propionic acid, a yellowing isocyanate monomer, the organic amine for neutralization, water, etc.
- the organosilane for modifying the water-dispersed polyurethane can be used in the chain extension step of the water-dispersed polyurethane, and the type of the organosilane is not particularly limited, but may be used as long as it is an organosilane having an amino group for chain extension.
- the organosilane preferably has a structure of the following formula.
- x is an integer of 1 to 2
- y and z is an integer of 1 to 3.
- the organosilane is N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3 At least one selected from the group consisting of -aminopropyltriethoxysilane and N- (2-aminoethyl) -3-aminopropyltripropoxysilane.
- the content of the organosilane is preferably 1 to 5% by weight with respect to the total silane-modified water-dispersed polyurethane.
- the content is less than 1% by weight, a sufficient molecular weight increase effect cannot be obtained.
- Internal crosslinking which is a property of the glass silane, may not be sufficient, resulting in poor adhesion and corrosion resistance.
- the content exceeds 5% by weight is too large or the viscosity of the water-dispersed urethane particles is difficult to use as a coating resin.
- the curing agent included in the coating composition may improve the adhesion and crosslinkability between the silane-modified water-dispersed polyurethane and the steel sheet containing magnesium.
- the curing agent may be directly crosslinked with silanol groups, which are hydrolysis products of organosilanes, or directly with urethane groups or carboxyl groups of water-dispersed polyurethanes.
- the hardener may induce covalent bonds through direct reaction with the polar groups of the magnesium-containing steel sheet.
- the curing agent is 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltripropylsilane, 3-glycidoxypropyltriisoflophyllsilane, 2- ( At least one selected from the group consisting of 3,4 epoxycyclohexyl) ethyltrimethoxysilane and 2- (3,4 epoxycyclohexyl) ethyltriethoxysilane.
- the content of the curing agent in the total coating composition is 0.5 to 5% by weight. If the content is 0.5% by weight or less, the crosslinking density decreases, resulting in poor physical properties such as corrosion resistance, solvent resistance, and alkali resistance, and when not exceeding 5.0% by weight, unreacted. Hardeners can reduce corrosion resistance and increase the viscosity of the silane-modified water-dispersed polyurethanes, resulting in poor solution stability.
- the magnesium-containing steel sheet causes a rapid rise in pH due to the high oxidation rate of magnesium when moisture penetrates into the coating film. For this reason, a strong alkaline plating layer can be formed at the interface with the coating film to promote discoloration of the plating layer and hydrolysis of the resin.
- the anti-blackening agent included in the coating composition of the present invention can prevent discoloration by inhibiting a rapid increase in pH generated when water penetrates into the coating film.
- the blackening agent is preferably at least one selected from the group consisting of nickel compounds, vanadium compounds, zirconium compounds, cerium compounds and molybdenum compounds, each metal compound in the blackening agent is composed of chloride, nitrate, sulfur oxides and ammonium salts One or more selected from the group can be used.
- the content of the blackening agent in the total coating composition is 0.5 to 5% by weight. If the content is less than 0.5% by weight, the blacking phenomenon occurring during the corrosion resistance test or the constant temperature and humidity test cannot be prevented, and when the content exceeds 5% by weight, Due to the increase in the oxidizing material, it is possible to reduce the blackening resistance and corrosion resistance while promoting the initial discoloration of magnesium in the plating component.
- the rust preventive agent included in the chromium-free coating composition may use a silicate material combined with a metal.
- the metal material bound to the silicate material facilitates the rapid dissolution of the silicate and allows the silicate to easily form complexes with magnesium ions or zinc ions in the plating layer. For this reason, the rust preventive agent may exhibit rust resistance by inhibiting the dissolution of additional magnesium or zinc.
- the rust inhibitor may be used without limitation as long as it is a silicate material combined with a metal.
- the rust inhibitor may be at least one selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate.
- the content of the rust preventive agent in the total coating composition is 0.5 to 5% by weight, and if the content is less than 0.5% by weight, it is difficult to exert sufficient corrosion resistance. Due to the poor corrosion resistance and poor paintability.
- the rust preventive agent has a metal content of 0.1 to 2% by weight based on the total rust preventive agent, and when the metal content is less than 0.1% by weight, the dissolution of the silicate is slow and effective corrosion resistance is not achieved. Quick dissolution results in deliquescent, resulting in wetting of the coating film, resulting in poor corrosion resistance and alkali resistance.
- Lubricants included in the chromium-free coating composition can be used under conditions that do not impair the lubricity of the coating composition, polyethylene, tetrafluoroethylene, polyethylene and tetrafluoroethylene chemically bonded products, polyamide-based , Polypropylene and polysiloxane can be used.
- the content of the lubricant in the total coating composition is 0.5 to 5% by weight. If the content is less than 0.5% by weight, it is difficult to exhibit sufficient lubricating properties during the processing, and when it exceeds 5% by weight, the content of the dispersant included in the lubricant is included. The corrosion resistance worsens and the repaintability is poor due to the release of lubricant.
- the coating layer has a dry coating amount of 300 to 1200 mg / m 2, and if the coating amount is less than 300 mg / m 2, it is difficult to secure sufficient corrosion resistance and other physical properties. When the coating layer exceeds 1200 mg / m 2, conductivity and economy are inferior.
- the chromium-free coating composition has a curing temperature of 70 to 180 ° C. If the curing temperature is less than 70 ° C, blocking problems and alkali resistance of the coating line due to undrying and uncuring may be degraded. Economical cost due to use.
- the NCO value was measured and the reaction temperature was maintained until the temperature was 5 or less. After the reaction was completed, the prepolymer was cooled to 80 ° C and neutralized with triethylamine (TEA), a trivalent amine.
- TAA triethylamine
- Another 3L flask was prepared, 1,050 g of distilled water was added, and maintained at 30 ° C., and the mixture was stirred vigorously while pouring the prepared prepolymer into the flask to which the water dispersion was added. After the prepolymer was added, the mixture was stirred for 30 minutes, and then 70 g of 30% hydrazine hydrate was uniformly dropped for 10 minutes. When the homogeneous dropping was completed, the reaction was maintained at 50 ° C. for 2 hours. After completion of the reaction, a homogeneous water-dispersed polyurethane having a solid content of about 34% was obtained.
- silane-modified water-dispersed urethane a curing agent (S-501, manufactured by Japan Chisso Corp.), a blackening agent (ammonium molybdate tetrahydrate, manufactured by Sigma-Aldrich, USA), a rust preventive agent (lithium polysilicate, manufactured by Grace, USA), A lubricant (W-500, manufactured by Mitsui Chemicals, Japan) and purified water were added to the contents shown in Table 2 below to prepare a coating composition.
- S-501 manufactured by Japan Chisso Corp.
- blackening agent ammonium molybdate tetrahydrate, manufactured by Sigma-Aldrich, USA
- a rust preventive agent lithium polysilicate, manufactured by Grace, USA
- a lubricant W-500, manufactured by Mitsui Chemicals, Japan
- Example 2 Example 3
- Example 4 Example 5
- Example 6 Example 7 Comparative Example 1 Synthesis Example 1 0 0 0 0 0 0 0 0 55 Synthesis Example 2 55 0 0 0 0 0 0 0 Synthesis Example 3 0 55 0 0 0 0 0 0 Synthesis Example 4 0 0 55 0 0 0 0 0 Synthesis Example 5 0 0 0 55 0 0 0 0 0 Synthesis Example 6 0 0 0 0 55 0 0 0 Synthesis Example 7 0 0 0 0 0 0 55 0 0 Synthesis Example 8 0 0 0 0 0 0 55 0 Hardener 2 2 2 2 2 2 2 2 2 2 2
- Blackening agent 2 2 2 2 2 2 2 2 2 2 Rust preventive 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
- the coating composition of Examples 1 to 7 and Comparative Example 1 was applied with a bar coater and dried at PMT 150 ° C. to form a coating film, and the coating amount of the coating composition was 1,000. mg / m 2. Thereafter, the dry coating performance of the coating composition of Examples 1 to 7 and Comparative Example 1 was evaluated under the following conditions, and the results are shown in Table 3.
- the white corrosion occurrence rate (based on 72 hours) of the surface-treated steel sheet was checked to evaluate the plate corrosion resistance.
- FC-4460 strong alkaline degreasing agent
- the color change ( ⁇ E) before and after the experiment was measured by leaving the specimen at a pressure of 10-20 kgf / cm for 120 hours in a constant temperature and humidity chamber maintained at 50 ° C and 95% RH, and evaluated by the following criteria.
- a gauze sufficiently prepared with ethanol and acetone having a purity of 98% or more was prepared, and the change in appearance was evaluated after reciprocating the gauze with solvent 5 times with a force of 5N.
- Acry melamine-based small-size paint was sprayed to a thickness of 30 ⁇ m on the specimen, and after the spray coating was dried, fine sheaths were coated on the coating layer so that 100 grids emerged at 1 mm intervals. After that, the adhesion was evaluated by the cellophane tape on the grid portion.
- Color difference value ( ⁇ L) was measured and evaluated 1 hour before and after the application of petroleum jelly to the prepared specimen.
- Examples 1 to 7 In comparison with Comparative Example 1 without silane modification, Examples 1 to 7 all obtained good corrosion resistance, alkali resistance, blackening resistance, and solvent resistance.
- Example 4 In the silane-modified water-dispersed polyurethane of Synthesis Example 5 used in Example 4, a curing composition, a blackening agent, a rust preventive agent, a lubricant, and an integer were added to the contents shown in Table 4 below to prepare a coating composition. Thereafter, the dry coating performance of the coating compositions of Examples 8 to 19 and Comparative Examples 2 to 9 was evaluated, and the results are shown in Table 4.
- Example 5 Hardener Blackening agent Rust preventive slush essence Corrosion resistance Alkali resistance Black degeneration Solvent resistance Paintability Anti-fingerprint
- Example 8 55 0.5 2 3 One 38.5 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Example 9 55 5 2 3 One 34 ⁇ ⁇ ⁇ ⁇ ⁇ Example 10 55 2 0.5 3 One 38.5 ⁇ ⁇ ⁇ ⁇ ⁇ Example 11 55 2 5 3 One 34 ⁇ ⁇ ⁇ ⁇ ⁇ Example 12 55 2 2 One One 39 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Example 13 55 2 5 One 35 ⁇ ⁇ ⁇ ⁇ ⁇ Example 14 55 0.5 0.5 3 One 40 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Example 15 55 5 5 3 One 31 ⁇ ⁇ ⁇ ⁇ ⁇ Example 16 55 0.5 0.5 One One 42 ⁇ ⁇ ⁇ ⁇ ⁇ Example 17 55 0.5 0.5 5 One 38 ⁇ ⁇ ⁇ ⁇ ⁇
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Abstract
Description
구 분(중량%) | 하이드라진 하이드레이트(30%) | KBM-603 | KBM-603 | KBE-602 | KBE-602 |
합성예 1 | 70 | 0 | 0 | 0 | 0 |
합성예 2 | 50 | 20 | 0 | 0 | 0 |
합성예 3 | 30 | 40 | 0 | 0 | 0 |
합성예 4 | 10 | 60 | 0 | 0 | 0 |
합성예 5 | 0 | 70 | 0 | 0 | 0 |
합성예 6 | 0 | 0 | 70 | 0 | 0 |
합성예 7 | 0 | 0 | 0 | 70 | 0 |
합성예 8 | 0 | 0 | 0 | 0 | 70 |
구분(중량%) | 실시예1 | 실시예2 | 실시예3 | 실시예4 | 실시예5 | 실시예6 | 실시예7 | 비교예1 |
합성예 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 55 |
합성예 2 | 55 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
합성예 3 | 0 | 55 | 0 | 0 | 0 | 0 | 0 | 0 |
합성예 4 | 0 | 0 | 55 | 0 | 0 | 0 | 0 | 0 |
합성예 5 | 0 | 0 | 0 | 55 | 0 | 0 | 0 | 0 |
합성예 6 | 0 | 0 | 0 | 0 | 55 | 0 | 0 | 0 |
합성예 7 | 0 | 0 | 0 | 0 | 0 | 55 | 0 | 0 |
합성예 8 | 0 | 0 | 0 | 0 | 0 | 0 | 55 | 0 |
경화제 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
흑변방지제 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
방청제 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
슬립윤활제 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
정수 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 |
구 분 | 내식성 | 내알카리성 | 내흑변성 | 내용제성 | 도장성 | 내지문성 |
실시예 1 | ◎ | ○ | ◎ | ○ | ◎ | ◎ |
실시예 2 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 3 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 4 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 5 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 6 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 7 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
비교예 1 | X | X | X | X | ○ | ◎ |
구분 (중량%) | 합성예5 | 경화제 | 흑변 방지제 | 방청제 | 윤활제 | 정수 | 내식성 | 내알카리성 | 내흑변성 | 내용제성 | 도장성 | 내지문성 |
실시예 8 | 55 | 0.5 | 2 | 3 | 1 | 38.5 | ○ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 9 | 55 | 5 | 2 | 3 | 1 | 34 | ◎ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 10 | 55 | 2 | 0.5 | 3 | 1 | 38.5 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 11 | 55 | 2 | 5 | 3 | 1 | 34 | ○ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 12 | 55 | 2 | 2 | 1 | 1 | 39 | ◎ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 13 | 55 | 2 | 2 | 5 | 1 | 35 | ◎ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 14 | 55 | 0.5 | 0.5 | 3 | 1 | 40 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 15 | 55 | 5 | 5 | 3 | 1 | 31 | ○ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 16 | 55 | 0.5 | 0.5 | 1 | 1 | 42 | ◎ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 17 | 55 | 0.5 | 0.5 | 5 | 1 | 38 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
실시예 18 | 55 | 5 | 5 | 1 | 1 | 33 | ◎ | ◎ | ◎ | ○ | ◎ | ◎ |
실시예 19 | 55 | 5 | 5 | 5 | 1 | 29 | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
비교예 2 | 55 | 0 | 2 | 3 | 1 | 39 | X | X | ◎ | X | ○ | ◎ |
비교예 3 | 55 | 2 | 0 | 3 | 1 | 39 | X | ◎ | X | ◎ | ◎ | ◎ |
비교예 4 | 55 | 2 | 2 | 0 | 1 | 40 | X | ◎ | ◎ | ◎ | ◎ | ◎ |
비교예 5 | 55 | 2 | 2 | 3 | 0 | 38 | ○ | ◎ | X | ◎ | ◎ | ◎ |
비교예 6 | 55 | 7 | 2 | 3 | 1 | 32 | X | X | ◎ | X | ◎ | ◎ |
비교예 7 | 55 | 2 | 7 | 3 | 1 | 32 | X | X | ◎ | ◎ | ◎ | ◎ |
비교예 8 | 55 | 2 | 2 | 10 | 1 | 30 | X | X | X | X | X | X |
비교예 9 | 55 | 2 | 2 | 3 | 5 | 33 | ○ | ◎ | ◎ | ◎ | X | ◎ |
Claims (12)
- 실란변성 수분산 폴리우레탄 20 내지 70 중량%, 경화제 0.5 내지 5 중량%, 흑변 방지제 0.5 내지 5 중량%, 방청제 0.5 내지 5 중량%, 윤활제 0.5 내지 5 중량% 및 잔부 용매를 포함하는 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 실란변성 수분산 폴리우레탄은 수 평균 분자량이 10,000 내지 60,000인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 실란변성 수분산 폴리우레탄은, 전체 실란변성 수분산 폴리우레탄에 대하여, 유기실란의 함량이 1 내지 5 중량%인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제3항에 있어서, 상기 유기실란은 하기 화학식의 구조를 가진 화합물인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.H2NCH2CH2NHCH2CH2CH2-Si-(CxH2x + 1)3 - z(OCyH2y+1)z(상기 화학식에서, x는 1 내지 2의 정수이며, y 및 z 는 1 내지 3의 정수이다.)
- 제3항에 있어서, 상기 유기실란은 N-(2-아미노에틸)-3-아미노프로필메틸디메톡시실란, N-(2-아미노에틸)-3-아미노프로필트리메톡시실란, N-(2-아미노에틸)-3-아미노프로필트리에톡시실란 및 N-(2-아미노에틸)-3-아미노프로필트리프로폭시실란으로 이루어진 군에서 선택된 하나 이상인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 경화제는 3-글리시독시프로필트리메톡시실란, 3-글리시독시프로필트리에톡시실란, 3-글리시독시프로필트리프로필실란, 3-글리시독시프로필트리이소플로필실란, 2-(3,4에폭시사이클로헥실)에틸트리메톡시실란 및 2-(3,4에폭시사이클로헥실)에틸트리에톡시실란으로 이루어진 군에서 선택된 하나 이상인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 흑변 방지제는 니켈 화합물, 바나듐계 화합물, 지르코늄계 화합물, 세륨계 화합물 및 몰리브덴계 화합물로 이루어진 군에서 선택된 하나 이상인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 방청제는 리튬실리케이트, 소디움실리케이트 및 칼륨실리케이트로 이루어진 군에서 선택된 하나 이상인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 제1항에 있어서, 상기 방청제는, 전체 방청제에 대하여, 금속의 함량이 0.1 내지 2 중량%인 내흑변성 및 내식성이 우수한 크롬프리 코팅 조성물.
- 마그네슘을 함유한 강판; 및상기 강판의 적어도 일면에 형성되는 코팅층을 포함하며,상기 코팅층은 제1항 내지 제9항 중 어느 한 항의 크롬프리 코팅 조성물의 경화물인 내흑변성 및 내식성이 우수한 표면처리 강판.
- 제10항에 있어서, 상기 코팅층은 건조 피막 부착량이 300 내지 1200mg/㎡인 내흑변성 및 내식성이 우수한 표면처리 강판.
- 제10항에 있어서, 상기 크롬프리 코팅 조성물은 경화 온도가 70 내지 180℃인 내흑변성 및 내식성이 우수한 표면처리 강판.
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EP3239256A4 (en) | 2018-01-03 |
KR20160082357A (ko) | 2016-07-08 |
US20170369735A1 (en) | 2017-12-28 |
JP2019112644A (ja) | 2019-07-11 |
JP6790146B2 (ja) | 2020-11-25 |
CN107109114B (zh) | 2019-08-02 |
EP3239256A1 (en) | 2017-11-01 |
CN107109114A (zh) | 2017-08-29 |
US10457834B2 (en) | 2019-10-29 |
KR101736557B1 (ko) | 2017-05-17 |
JP2018507274A (ja) | 2018-03-15 |
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