WO2011093282A1 - 表面処理皮膜、金属表面処理剤及び金属表面処理方法 - Google Patents
表面処理皮膜、金属表面処理剤及び金属表面処理方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B32B7/04—Interconnection of layers
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- 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
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- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
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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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/36—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
- C23C22/361—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing titanium, zirconium or hafnium compounds
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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
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- C23C22/40—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
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- C—CHEMISTRY; METALLURGY
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- C23C22/44—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
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Definitions
- the present invention relates to a surface treatment film capable of improving the adhesion between the surface of a metal material and a laminate film or a resin coating film, a metal surface treatment agent for forming the surface treatment film, and the metal surface treatment agent.
- the present invention relates to a method of treating a metal surface using More specifically, even when a resin film is laminated or a resin coating film is formed on the surface of a metal material, and then severe molding processing such as deep drawing processing, ironing processing or stretch drawing processing is performed, the lamination is performed.
- the present invention relates to a metal surface treatment agent or the like for forming a metal.
- Lamination is a processing means for heat-pressing a resin film (hereinafter referred to as a resin film or a laminate film) to the surface of a metal material, and is a metal for the purpose of protecting the surface or imparting design properties.
- a resin film or a laminate film This is one of the methods for coating the material surface and is used in various fields.
- This laminating process produces less waste gas such as solvent, carbon dioxide, etc. or warming gas generated during drying compared to the method of forming a resin coating by applying and drying a resin composition on the surface of a metal material. . Therefore, it is preferably applied in terms of environmental protection, and its uses are expanded.
- a body or lid of a food can made of aluminum thin plate material, steel thin plate material, aluminum foil for packaging or stainless steel foil, etc. It is used for containers or dry battery containers.
- a metal foil such as a lightweight and highly barriered aluminum foil or stainless steel foil is preferably used as an exterior material of a mobile lithium ion secondary battery used in a mobile phone, an electronic notebook, a notebook computer, a video camera, or the like. Lamination is applied to the surface of such a metal foil.
- lithium ion secondary batteries have been studied as driving energy for electric vehicles or hybrid vehicles, and laminated metal foils have also been examined as exterior materials.
- Laminate film used for laminating is directly bonded to a metal material and then heat-bonded. Therefore, there are advantages such that the waste of the raw material can be suppressed, the number of pinholes (defects) is small, and the workability is excellent as compared with a general resin coating film formed by applying and drying a resin composition.
- polyester resins such as polyethylene terephthalate and polyethylene naphthalate, and polyolefins such as polyethylene and polypropylene are generally used.
- metal surface When laminating a laminate film to a metal material surface (hereinafter also simply referred to as “metal surface”), the metal surface is degreased and washed to improve the adhesion between the laminate film and the metal surface and the corrosion resistance of the metal surface. Thereafter, chemical conversion treatment such as phosphoric acid chromate is usually performed.
- chemical conversion treatment such as phosphoric acid chromate is usually performed.
- such a chemical conversion treatment requires a washing step for removing excess treatment liquid after the treatment, and costs for waste water treatment of washing water discharged from the washing step.
- chemical treatments such as phosphoric acid chromate tend to be avoided from environmental considerations in recent years because a treatment solution containing hexavalent chromium is used.
- the lamination process is performed without performing a chemical conversion treatment or the like on the metal surface
- the laminate film is peeled off from the metal surface or the metal material is corroded.
- the contents are added to the container or packaging material after lamination, and then heat treatment for sterilization is performed, but the laminate film is peeled off from the metal surface during the heat treatment.
- the exterior material etc. of a lithium ion secondary battery processing with a high degree of processing is received in the manufacturing process.
- Patent Document 1 proposes a base treatment agent containing a specific amount of a water-soluble zirconium compound, a water-soluble or water-dispersible acrylic resin having a specific structure, and a water-soluble or water-dispersible thermosetting crosslinking agent.
- Patent Document 2 proposes a non-chromium metal surface treatment agent comprising a specific amount of a water-soluble zirconium compound and / or water-soluble titanium compound, an organic phosphonic acid compound, and tannin.
- Patent Document 3 proposes a metal surface treatment agent containing an aminated phenol polymer and a specific metal compound such as Ti and Zr and having a pH in the range of 1.5 to 6.0.
- Patent Document 4 proposes a resin film containing an aminated phenol polymer, an acrylic polymer, a metal compound, and, if necessary, a phosphorus compound (C).
- the purpose of the present invention is to laminate a resin film on the surface of a metal material or to form a resin coating film, and then apply severe molding processing such as deep drawing processing, ironing processing or stretch drawing processing,
- An object of the present invention is to provide a surface-treated film capable of imparting high adhesion such that the laminate film or resin film does not peel off, and to provide a metal material having the surface-treated film.
- Another object of the present invention is to provide a metal surface treatment agent for forming the surface treatment film, and to provide a metal surface treatment method using the metal surface treatment agent.
- the surface treatment film according to the present invention for solving the above problems is a surface treatment film formed by coating on the surface of a metal material, and a mass ratio (N / C) of nitrogen and carbon contained in the surface treatment film. Is 0.005 to 0.5, and the mass ratio (TM / C) of the total of metal elements selected from Cr (III), Zr, Ti, V, Nb, Mo, W, and Ce to carbon is 0. .01 to 1.3.
- the mass ratio (N / C) of nitrogen and carbon contained in the surface treatment film, and the total of the metal elements contained in the surface treatment film and the mass ratio of carbon (TM / C) are within the above range. Therefore, it is possible to improve both the adhesion between the surface of the metal material and the surface treatment film and the adhesion between the laminate film and the surface treatment film, good corrosion resistance, and preferable in terms of acid resistance. It becomes.
- the mass ratio of nitrogen and carbon (N / C) within the above range, sufficient adhesion can be obtained between the surface treatment film and the laminate film, and the water resistance of the surface treatment film can be improved. It is possible to prevent the deterioration of the corrosion resistance (particularly acid resistance, the same applies hereinafter) on the surface of the metal material by preventing the decrease, and thus the decrease in the adhesion between the surface of the metal material and the surface treatment film.
- the total mass of metal elements and the mass ratio of carbon (TM / C) within the above range, the deterioration of adhesion between the surface of the metal material and the surface treatment film is prevented, and the corrosion medium is formed on the surface of the metal material.
- the metal surface treatment agent according to the present invention for solving the above problems provides the following two metal surface treatment agents capable of obtaining the surface treatment film according to the present invention.
- the first metal surface treatment agent includes one or more water-based resins (P) selected from urethane resin, epoxy resin, acrylic resin, polyolefin resin, formalin condensation resin, natural polysaccharide, polyamide and polyacrylamide. And a water-soluble metal compound containing one or more metal elements selected from Cr (III), Zr, Ti, V, Nb, Mo, W and Ce, and among the aqueous resins (P) At least one type has one or more nitrogen-containing functional groups selected from the following structural formulas (1) to (8).
- the second metal surface treatment agent includes one or more first water-based resins (P1) selected from urethane resins, epoxy resins, and acrylic resins, polyolefin resins, formalin condensation resins, natural polysaccharides, polyamides, and the like.
- One or more second water-based resins (P2) selected from polyacrylamide and one or more metals selected from Cr (III), Zr, Ti, V, Nb, Mo, W and Ce A water-soluble metal compound containing an element, and at least one of the first aqueous resin (P1) and the second aqueous resin (P2) is selected from the following structural formulas (1) to (8) Or it has 2 or more types of nitrogen-containing functional groups, It is characterized by the above-mentioned.
- R 1 , R 2 , and R 3 are each independently hydrogen, a linear, branched, or cyclic alkyl group or alkenyl group having 1 to 10 carbon atoms.
- X is one or more selected from hydroxyl ion, halogen ion, sulfate ion, sulfonate ion, phosphate ion and phosphonate ion.
- the water-based resin since the specific type of water-based resin having a specific type of nitrogen-containing functional group is contained, the water-based resin can be stably present in the treatment agent and has high adhesion to the metal surface. It is possible to form a surface-treated film that brings about properties. As a result, a surface treatment film formed by treatment with these metal surface treatment agents is formed on a metal surface, and a resin film is laminated thereon or a resin coating film is formed by deep drawing, ironing or stretch drawing. Even when severe molding processing such as processing is performed, the laminate film or resin coating film is difficult to peel off.
- the second metal surface treatment agent from the first aqueous resin (P1) and the first aqueous resin (P1) which are easily oriented on the surface of the obtained treatment film (the surface opposite to the surface side of the metal material). Since the second aqueous resin (P2) having high polarity and easy to be oriented on the surface of the metal material is used in combination, a surface-treated film that provides better moldability and adhesion can be formed.
- the aqueous resin containing the nitrogen-containing functional group has a number average molecular weight per nitrogen-containing functional group of 50 to 3000, and the metal surface
- the water-soluble metal compound is contained in an amount of 1 to 50% by mass in terms of metal based on the total solid content in the treatment agent.
- the water-based resin containing a nitrogen-containing functional group has a number average molecular weight per nitrogen-containing functional group within the above range, and the water-soluble metal compound is contained in the total solid content in the metal surface treatment agent. Since the amount is within the above range, the mass ratio (N / C) of nitrogen and carbon contained in the surface treatment film obtained using this metal surface treatment agent is within the range of 0.005 to 0.5. The mass ratio (TM / C) of the total of metal elements and carbon contained in the surface treatment film can be within a range of 0.01 to 1.3.
- this metal surface treatment agent As a result, if this metal surface treatment agent is used, both the adhesion between the surface of the metal material and the obtained surface treatment film and the adhesion between the laminate film and the obtained surface treatment film are improved. In addition, it has good corrosion resistance and can form a surface treatment film that is preferable in terms of acid resistance.
- the metal surface treatment method according to the present invention is such that the first or second metal surface treatment agent according to the present invention is applied to the surface of a metal material and then heated at a temperature of 60 to 250 ° C. It is characterized by drying.
- the metal material according to the present invention for solving the above-described problems is characterized by having the surface treatment film according to the present invention.
- the “nitrogen / carbon” ratio and the “total of metal elements / carbon” ratio included in the film are within a specific range. Both the adhesion between the laminate film and the adhesion between the laminate film and the surface treatment film can be enhanced, the corrosion resistance is good, and the acid resistance is preferable.
- the water-based resin can be stably present in the treatment agent, and a surface treatment film that provides high adhesion to the metal surface is formed. be able to.
- a surface treatment film is formed on the metal surface with the metal surface treatment agent according to the present invention, and a resin film is laminated thereon or a resin coating film is formed by deep drawing, ironing or stretch drawing. Even when a severe molding process such as the above is performed, there is an effect that the laminate film or the resin coating film is hardly peeled off.
- the metal surface treatment agent according to the present invention is applied to the surface of the metal material (the surface of the metal to be treated) and then dried by heating. A surface-treated film with good adhesion can be formed.
- the metal material according to the present invention has a surface treatment film on its surface, the adhesion of the laminate film to the surface treatment film can be enhanced. As a result, a laminate of a resin film or a resin coating film on the surface treatment film is laminated even when severe molding processing such as deep drawing processing, ironing processing or stretch drawing processing is performed. There is an effect that the film or the resin coating film is hardly peeled off.
- the surface treatment film 2 is a surface treatment film applied and formed on the surface of the metal material 1 (hereinafter referred to as “metal surface”), and is included in the surface treatment film 2.
- the total mass of metal elements selected from the group consisting of Cr (III), Zr, Ti, V, Nb, Mo, W and Ce, with a mass ratio of nitrogen to carbon (N / C) of 0.005 to 0.5 And the carbon mass ratio (TM / C) is 0.01 to 1.3.
- the surface treatment film 2 is a film obtained by applying a metal surface treatment agent according to the present invention, which will be described later, to a metal surface and then drying by heating at a predetermined temperature. And a laminate film (or resin coating film) 3.
- the mass ratio (N / C) of nitrogen and carbon When the mass ratio (N / C) of nitrogen and carbon is less than 0.005, sufficient adhesion may not be obtained between the surface treatment film 2 and the laminate film 3. On the other hand, when the mass ratio (N / C) of nitrogen and carbon exceeds 0.5, the water resistance of the surface treatment film 2 is lowered, the corrosion resistance of the metal surface is lowered, and consequently between the metal surface and the surface treatment film 2. May cause reduced adhesion.
- the mass ratio (N / C) of nitrogen and carbon improves the adhesion between the metal surface and the surface treatment film 2 and the corrosion resistance of the surface treatment film 2, and further aggregates by introducing nitrogen-containing functional groups that are polar groups.
- the adhesion between the surface treatment film 2 and the laminate film 3 and the surface treatment film 2 are further improved.
- it is particularly preferably in the range of 0.05 to 0.3.
- the reason why the upper limit value of the preferable range is 0.4 and the upper limit value of the particularly preferable range is 0.3 is based on the viewpoints of water resistance and adhesion.
- the adhesion between the metal surface and the surface treatment film 2 is prevented from decreasing, and a corrosion medium enters the metal surface and is corrosion resistant. Can be prevented, and in particular, in a high-humidity environment, the adhesion between the metal surface and the surface treatment film 2 can be prevented from being lowered, and further, the surface treatment film 2 can be prevented from becoming brittle. There is an advantage that the adhesion between the surface-treated film 2 and the laminate film 3 is not lowered even if processing is added to the above.
- the adhesion between the metal surface and the surface treatment film 2 is lowered, and as a result, a corrosive medium enters the metal surface. Corrosion resistance may be insufficient. In particular, the adhesion between the metal surface and the surface treatment film 2 may deteriorate in a high humidity environment.
- the mass ratio (TM / C) of the total of metal elements and carbon exceeds 1.3, the surface treatment film 2 becomes too brittle, and when processing is added thereafter, the surface treatment film 2 and the laminate film 3 The adhesiveness of is reduced.
- the mass ratio (TM / C) of the total of metal elements and carbon is 0.01% from the viewpoint of improving the adhesion and corrosion resistance and further improving the film forming property so as not to cause cracks. Is preferably in the range of 0.7 to 0.7, and particularly in the range of 0.05 to 0.3 from the viewpoint of improving the adhesion between the metal surface and the surface treatment film 2 in a high humidity environment. Particularly preferred.
- the carbon content was measured using a total organic carbon analyzer (TOC: 5000-A) manufactured by Shimadzu Corporation, oxygen flow rate: 0.5 L / min, temperature: 580 ° C. (aluminum) ), 700 ° C. (iron-based material), measurement time: 120 seconds, sample size: 10 mm ⁇ 20 mm.
- Nitrogen content is based on the organic nitrogen analysis method (JIS-K0102), and the metal material on which the surface treatment film is formed is immersed in concentrated sulfuric acid for 30 seconds to peel and dissolve the film, and the stripping solution (sulfuric acid solution) The total nitrogen concentration was measured according to JIS-K0102.
- the pretreatment was Kjeldahl method, and the measurement was performed by indophenol blue absorptiometry.
- the total mass of the metal elements was measured using a fluorescent X-ray analyzer “3270E” manufactured by Rigaku Denki Kogyo Co., Ltd. under the conditions of tube: Rh, voltage-current: 50 KV-50 mA.
- the “nitrogen / carbon” ratio and the “total of metal elements / carbon” ratio of the film are within a specific range. It is possible to improve both the adhesion between the two and the adhesion between the laminate film 3 and the surface treatment film 2, and the corrosion resistance is good, which is preferable in terms of acid resistance.
- a metal material having such a surface treatment film on its surface can enhance the adhesion of the laminate film to the surface treatment film.
- a laminate of a resin film or a resin coating film on the laminate film or resin even when subjected to severe molding such as deep drawing, ironing or stretch drawing There is an effect that the coating film is difficult to peel off.
- the metal surface treatment agent according to the present invention is a treatment agent for obtaining the surface treatment film according to the present invention, and provides the metal surface treatment agent of the following two aspects.
- the first metal surface treatment agent includes one or more water-based resins (P) selected from urethane resin, epoxy resin, acrylic resin, polyolefin resin, formalin condensation resin, natural polysaccharide, polyamide and polyacrylamide. , Cr (III), Zr, Ti, V, Nb, Mo, W and Ce, and a water-soluble metal compound containing one or more metal elements.
- At least one of the aqueous resins (P) has one or more nitrogen-containing functional groups selected from the structural formulas (1) to (8).
- symbol (P) points out the water-system resin which comprises a 1st metal surface treating agent.
- the second metal surface treatment agent includes one or more first water-based resins (P1) selected from urethane resins, epoxy resins, and acrylic resins, polyolefin resins, formalin condensation resins, natural polysaccharides, One or more second water-based resins (P2) selected from polyamide and polyacrylamide, and one or more selected from Cr (III), Zr, Ti, V, Nb, Mo, W and Ce. And a water-soluble metal compound containing a metal element. At least one of the first aqueous resin (P1) and the second aqueous resin (P2) is one or more nitrogen-containing functional groups selected from the structural formulas (1) to (8). have.
- the first aqueous resin (P1) has a property of being easily oriented on the surface of the obtained surface treatment film (opposite surface on the metal surface side), and the second aqueous resin (P2) is more than the first aqueous resin. It has a high polarity and is easily oriented on the metal surface.
- the first metal surface treatment agent is one or more water-based resins (P) selected from urethane resin, epoxy resin, acrylic resin, polyolefin resin, formalin condensation resin, natural polysaccharide, polyester, polyamide and polyacrylamide. ) Is used. In this embodiment, usually 1 to 3 types of water-based resins are blended and used, but more than that may be used.
- P water-based resins
- the second metal surface treatment agent includes one or more first water-based resins (P1) selected from urethane resins, epoxy resins, and acrylic resins, polyolefin resins, formalin condensation resins, natural polysaccharides, It is characterized in that it is used in combination with one or more second aqueous resins (P2) selected from polyester, polyamide and polyacrylamide.
- P1 water-based resins
- P2 second aqueous resins
- one or two kinds of first aqueous resins and one or two kinds of second aqueous resins are usually used in combination, but more than that may be used.
- first and second metal surface treatment agents contain one or more water-based resins, and at least one of them is one or two selected from the structural formulas (1) to (8). It has the above nitrogen-containing functional groups.
- Structural formulas (1) to (8) represent a primary to tertiary amino group, a quaternary ammonium group, and a primary to secondary amide group.
- the nitrogen-containing functional groups of the structural formulas (1) and (2) are present in the side chain of the aqueous resin, and the nitrogen-containing functional groups of the structural formulas (3) to (6) are all present in the main chain of the aqueous resin.
- the aqueous resin having a nitrogen-containing functional group of any one of these structural formulas (1) to (6) exhibits a cationic property in water.
- the nitrogen-containing functional groups in the structural formulas (7) and (8) indicate a structure having an amide bond in the side chain or main chain of the aqueous resin.
- the water-based resin contained in the metal surface treatment agent only needs to have at least one of the nitrogen-containing functional groups described above, and all of the water-based resins contained include one or two of the nitrogen-containing functional groups described above. You may have more than one seed. Since the water-based resin has a nitrogen-containing functional group, the adhesion between the obtained surface treatment film and the metal surface is excellent, and the water dispersibility (stability in the liquid) of the metal surface treatment agent is good. Become.
- the amino group is cationic in water and has the effect of improving the water solubility or water dispersibility of the resin.
- the amide group is nonionic, but exhibits high polarity due to the lone pair of nitrogen (lone pair) and the polarization of the carbonyl group. Has the ability to grant.
- the metal surface treatment agent By including a certain amount of nitrogen-containing functional groups in the water-based resin constituting the metal surface treatment agent, adhesion between the metal surface and the obtained surface treatment film and the laminate film and the obtained surface treatment film It is possible to improve both the adhesion between them and to improve the corrosion resistance. Furthermore, the stability of the metal surface treatment agent is improved, and a metal treatment film with good adhesion can be formed stably.
- the number average molecular weight per nitrogen-containing functional group of the aqueous resin having a nitrogen-containing functional group is preferably in the range of 50 to 3000.
- the ratio (N / C) can be 0.005 to 0.5.
- the surface treatment film and the laminate film Sufficient adhesion between the metal surface and the surface treated film to prevent deterioration of the water resistance to prevent deterioration of the corrosion resistance of the metal surface, and thus the adhesion between the metal surface and the obtained surface treated film. Decline can be prevented.
- the number average molecular weight of the aqueous resin per nitrogen-containing functional group of the aqueous resin having a nitrogen-containing functional group has the above relationship
- the number average molecular weight of the aqueous resin having no nitrogen-containing functional group in the structure is There is no particular limitation, and it is arbitrary depending on the content of the nitrogen-containing functional group, but if it is intentionally defined, it is preferably in the range of 1000 to 100,000. If it is less than 1000, the film forming property tends to be poor, and if it exceeds 100,000, the viscosity is too high and it becomes difficult to produce a stable treatment liquid.
- the aqueous resin contained does not contain a nitrogen-containing functional group regardless of whether the nitrogen-containing functional group is contained in all of the aqueous resin or one or a part thereof.
- the number average molecular weight per nitrogen-containing functional group of the aqueous resin containing a nitrogen functional group may be in the range of 50 to 3000 described above.
- the number average molecular weight per nitrogen-containing functional group of the aqueous resin containing a nitrogen-containing functional group may be in the range of 50 to 3000 as described above.
- the first aqueous resin (P1) contained in the second metal surface treatment agent has a number average molecular weight of 500 to 3000 per nitrogen-containing functional group of the first aqueous resin (P1) containing a nitrogen-containing functional group. It is more preferable to be within the range.
- the first aqueous resin (P1) within this range acts as a barrier that suppresses permeation of corrosion factors such as oxygen, moisture, and corrosive ions from outside the system in the surface treatment film.
- the second aqueous resin (P2) contained in the second metal surface treatment agent has a number average molecular weight of 50 to 1500 per nitrogen-containing functional group of the second aqueous resin (P2) containing a nitrogen-containing functional group. It is more preferable that it has a number average molecular weight.
- the second aqueous resin (P2) in this range strongly adsorbs to the metal surface in the surface treatment film, and acts to suppress the invasion of corrosion factors at the interface with the metal.
- the case where all the 2nd water based resin (P2) has a nitrogen-containing functional group is especially preferable from a viewpoint of adhesiveness with a metal surface.
- the first aqueous resin (P1) is oriented on the surface of the obtained surface treatment film.
- the second aqueous resin (P2) having a higher polarity than the first aqueous resin (P1) is easily oriented on the metal surface, and as a result, the adhesion of the surface treatment film formed on the metal surface can be further increased. There is an effect that can be done.
- the blending ratio (P1 / P2) of the first aqueous resin (P1) and the second aqueous resin (P2) that exhibits the above effects is not particularly limited and may be in a wide range.
- the mass ratio can be 1/99 to 99/1 (that is, 0.01 to 99).
- the blending ratio (P1 / P2) is more preferably 20/80 to 95/5 (that is, 0.25 to 95), and a preferable range in consideration of the balance of each characteristic is 40/60 to 95/5 ( That is, 0.66 to 95).
- water-based resins having nitrogen-containing functional groups are shown below.
- a polyol component which is a raw material monomer for example, alkylene (1 to 6 carbon atoms) glycol (ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, hexamethylene glycol, etc.), polyether polyol ( Polyethylene glycols such as diethylene glycol and triethylene glycol, polyethylene / propylene glycol, etc.), polyester polyols (alkylene glycols and polyether polyols as described above, bisphenol A, hydrogenated bisphenol A, trimethylolpropane, and polyols such as glycerin; Polybasic acids such as succinic acid, glutaric acid, adipic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, and trimellitic acid Polyester polyol) having terminal hydroxyl groups obtained by polycondensation of, and use of a polyol component such as a polycarbon
- a part or all of the polyol component is a cationic polyol having an amino group or an ammonium group in a side chain or a part of the main chain of the polyol structure (for example, N-alkyl-N, N-dihydroxyalkylamine).
- a polyol having an amino group in the main chain or a cationic polyol having an amino group in the side chain such as N, N-dialkylaminoalkylene glycol).
- polyols may be aromatic, alicyclic or aliphatic Polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate, cyclohexylene diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.
- the repolymer is emulsified and dispersed in an aqueous solution of a carboxylic acid such as alkyl sulfuric acid, formic acid or acetic acid, or an organic phosphonic acid, and subjected to chain extension reaction using water or / and an amine compound such as ethyleneamine or melamine.
- Urethane resin or the like can be used.
- a modified epoxy resin comprising an addition reaction between a bisphenol type, novolak type or alkylene type epoxy resin and a polyfunctional amine
- a bisphenol type, novolak type or alkylene type epoxy resin and a polyfunctional amine can be used.
- the above-mentioned polyfunctional amine is an amine having two or more active hydrogens in one molecule.
- Examples include diamine, amylamine, hexylamine, nonylamine, decylamine, triethylenetetramine, tetramethylenepentamine, dimethylaminopropylamine, N-aminoethylpiperazine, metacenediamine, and diaminodiphenylsulfone.
- Alkanolamines are particularly preferred because of their good solubility in water.
- acrylic resin a monomer having at least one of the constituent monomers of the resin having a nitrogen-containing functional group selected from primary to tertiary amino groups, quaternary ammonium groups, and primary to secondary amide groups can be used.
- acrylamide is used as a part of the monomer component, and further aminated by Mannich reaction, Hoffman reaction or the like.
- acrylic monomer having a nitrogen-containing functional group described above examples include aminoalkyl acrylates such as aminomethyl acrylate, aminomethyl methacrylate, aminoethyl acrylate, aminoethyl methacrylate, aminopropyl acrylate, aminobutyl acrylate, etc. 8) Esters, (meth) acrylamide, methylol (meth) acrylamide, and the like.
- polyolefin-based resins examples include cationic polyolefins such as polyvinylphenol-modified Mannich amine, polyvinyl imidazole, polyvinyl pyridine, and polyethyleneimine.
- formalin condensation resin examples include cationic formalin condensation resins such as melamine resin, Mannich modified aminated phenol resin, and Mannich modified amination resin of aniline and formalin condensation resin.
- natural polysaccharides include cationic natural polysaccharides such as chitin and chitosan.
- polyamides examples include cation-modified polyamides such as cationic nylon obtained by condensation polymerization of aminopiperazine and adipic acid.
- polyacrylamide examples include acrylamide homopolymers and copolymers with other monomers (acrylic acid, acrylate esters, etc.) copolymerizable with acrylamide.
- a metal surface treating agent is formed by combining one or more of these aqueous resins. It is preferable.
- the water-based resin constituting the metal surface treatment agent is a water-soluble resin, a water-based crosslinkable resin such as a water-based dispersion, a water-based emulsion forcedly emulsified by a self-emulsification or an emulsifier, regardless of whether or not it contains a nitrogen-containing functional group, Or a water-based polymer resin can be mentioned.
- These polymer resins may have a crosslinkable functional group as long as the effects of the present invention are not impaired.
- the water-based resin constituting the first and second metal surface treatment agents has a specific amount of the above-described nitrogen-containing functional groups, all or at least one or a part thereof, and as a result, It is sufficient that the mass ratio (N / C) of nitrogen and carbon contained in the surface treatment film is adjusted to be 0.005 to 0.5.
- the surface treatment film formed with the metal surface treatment agent according to the present invention is improved in (a) the adhesion between the formed surface treatment film and the laminate film and the moldability is improved.
- the water resistance of the surface-treated film is improved to prevent a decrease in the corrosion resistance of the metal surface, the adhesion between the metal surface-treated film and the metal surface is improved, and the moldability is improved.
- the water-soluble metal compound contained is one or more metals selected from Cr (III), Zr, Ti, V, Nb, Mo, W, and Ce.
- a water-soluble metal compound containing an element can be given.
- Cr (III) means that hexavalent chromium is not included.
- the water-soluble metal compound is a salt, complex compound or coordination compound of the above metal element.
- trivalent chromium compounds such as chromium fluoride, chromium nitrate, chromium sulfate, chromium oxalate, chromium acetate, and chromium biphosphate; zirconium hydrofluoric acid, zirconium zirconium hydrofluoride, zirconium fluoride Zirconium compounds such as sodium hydride, zirconyl nitrate, zirconyl sulfate, and zirconyl acetate; titanium hydrofluoric acid, potassium titanium hydrofluoride, sodium titanium hydrofluoride, titanyl sulfate, diisopropoxytitanium bisacetylacetone, lactic acid and titanium alkoxide And titanium compounds such as titanium lactate; pentavalent vanadium compounds such as vanadium pentoxide, metavanadate, ammonium meta
- one or more selected from Cr (III), Zr, Ti and V are used.
- a water-soluble metal compound containing any of the above metal elements is preferred. Since the metal compound having these specific metal elements is a compound that can react with the metal surface, it has an effect of improving the adhesion between the metal surface and the surface treatment film.
- the water-soluble metal compound contained in the metal surface treatment agent is preferably contained in an amount of 1 to 50% by mass in terms of metal in the total solid content of the metal surface treatment agent.
- metal elements Cr (III), Zr contained in the surface treatment film formed with the metal surface treatment agent
- Ti, V, Nb, Mo, W, and Ce the mass ratio of carbon (TM / C) to 0.01 to 1.3.
- the metal surface and the obtained The surface treatment film obtained can prevent the deterioration of the adhesion between the surface treatment film and the corrosion resistance due to the entry of the corrosive medium into the metal surface.
- the surface treatment film can be prevented from being deteriorated, and the surface treatment film thus obtained is prevented from becoming brittle to improve the flexibility of the surface treatment film itself, and then the surface treatment obtained even when processing is added. There is an advantage that adhesion between the film and the laminate film is not lowered.
- the mass ratio of the total metal elements (TM) and carbon (C) contained in the formed surface treatment film ( TM / C) may deviate from the above range, and as a result, the adhesion between the metal surface and the obtained surface treatment film may decrease, and the corrosion medium may enter the metal surface and the corrosion resistance may decrease. .
- the adhesion between the metal surface and the obtained surface treatment film tends to decrease in a high humidity environment.
- the content of the water-soluble metal compound contained in the metal surface treatment agent exceeds 50% by mass in terms of metal, the total of metal elements (TM) and carbon (C) contained in the formed surface treatment film
- the mass ratio (TM / C) may deviate from the above range, and as a result, the coating becomes brittle and the function of the laminate film as a base coating is unfavorable.
- the “total solid content” means a solid content excluding volatile components such as a solvent to be described later among the components constituting the metal surface treatment agent, specifically, an aqueous resin and a water-soluble resin. It indicates the total amount with the metallic metal compound. Therefore, the water-soluble metal compound contained in the metal surface treatment agent is 1 to 50% by mass in terms of metal with respect to the total amount (total solid content) of the water-based resin and the water-soluble metal compound constituting the metal surface treatment agent. include. More preferably, it is 1 to 20% by mass in terms of metal.
- solvent The solvent constituting the metal surface treatment agent is mainly water, but does not hinder the combined use of an alcohol-based, ketone-based, or cellosolve-based water-soluble organic solvent as necessary, such as improvement of the drying property of the film.
- surfactants In addition, surfactants, antifoaming agents, leveling agents, antibacterial and antifungal agents, coloring agents, curing agents, and the like can be added within a range that does not impair the spirit and film performance of the present invention.
- an organic cross-linking agent such as methylolated melamine, carbodiimide, and isocyanate, and ⁇ -glycidoxypropyltriethoxysilane, ⁇ -glycidoxypropyltriethoxy for improving adhesion Silane coupling agents such as silane, ⁇ -aminopropyltriethoxysilane, and N- ⁇ -aminoethyl- ⁇ -aminopropyltrimethoxysilane can be added as long as the gist of the present invention and the film performance are not impaired.
- the metal surface treatment agent according to the present invention is applied to the surface of a metal material 1 that is an object to be processed to form a surface treatment film 2 according to the present invention.
- the metal material 1 which is a to-be-processed object is not specifically limited, Various things can be applied.
- the resin film (3) is laminated or the resin film (3) is formed, and then deep drawing, ironing, or stretch drawing A metal material that can be subjected to severe molding such as is preferably used.
- FIG. 1 Metal material
- a surface treatment film may be formed, and a resin film or a resin coating film may be further provided.
- a metal material for example, a thin plate material made of aluminum or an aluminum alloy, a steel thin plate material, a stainless steel thin plate material, an aluminum foil for packaging, an aluminum alloy foil, or a stainless steel foil can be preferably exemplified.
- the metal material 1 on which the surface treatment film 2 is not provided is referred to as “metal substrate 1”
- the metal material 10 on which the surface treatment film 2 is provided on the metal substrate 1 is referred to as “metal material 10”. May be called.
- metal material examples include, but are not limited to, a metal material applicable to a body or lid of a food can, a food container, a dry battery container, a secondary battery exterior material, and the like.
- Metal materials that can be applied to a wide range of applications can be given. Particularly recently, exterior materials for mobile lithium-ion secondary batteries used in mobile phones, electronic notebooks, notebook computers, video cameras, etc., and exterior materials for lithium-ion secondary batteries used as drive energy for electric vehicles or hybrid vehicles. Examples of usable metal materials include:
- a specific type of water-based resin having a specific type of nitrogen-containing functional group is contained, and a specific type of water-soluble metal compound is further included. Therefore, the surface treatment of the above-mentioned composition (N / C ratio and TM / C ratio) that can cause the water-based resin to be stably present in the metal surface treatment agent and provides high adhesion to the metal surface.
- a film can be formed.
- a surface treatment film formed by treatment with such a metal surface treatment agent is formed on a metal surface, and a resin film is laminated thereon or a resin coating film is formed by deep drawing, ironing or stretch drawing. Even when severe molding processing such as processing is performed, there is an effect that the laminate film or the resin coating film is hardly peeled off.
- the metal surface treatment method according to the present invention is a method in which the above-described metal surface treatment agent is applied to a metal surface and then dried by heating at a temperature of 60 to 250 ° C.
- the “metal surface” is a surface of a metal material that is a target for forming a surface treatment film.
- the surface of the metal material is degreased and cleaned as necessary.
- the degreasing agent can be selected from various types suitable for metal substrates.
- the cleaning liquid is usually water, but it may be a water-soluble solvent or a surfactant aqueous solution.
- the degreasing means and the cleaning means are not particularly limited, and a spray method or a dipping method is preferably used.
- the metal surface treatment agent refers to the metal surface treatment agent according to the present invention described above, and may be either the first or second metal surface treatment agent.
- the liquid temperature of the metal surface treatment agent is usually in the range of 10 to 50 ° C.
- the means for applying the metal surface treatment agent is not particularly limited, and a spray method, a dipping method, or the like is preferably used.
- the contact time of the metal surface treating agent to the metal surface is usually about 0.5 to 180 seconds.
- the metal surface treatment agent according to the present invention is a coating-type treatment agent. Therefore, after contacting with the metal surface treatment agent, the metal surface treatment film is formed by performing the drying described below without washing.
- the formed surface treatment film is heated and dried at a temperature of 60 to 250 ° C.
- This temperature range can be arbitrarily changed depending on the kind of the resin component within the range, but 80 to 200 ° C. is more preferable.
- the method of heating and drying is not specified, and a batch type or continuous hot air circulation drying furnace, a conveyor type hot air drying furnace, or an electromagnetic induction heating furnace using an IH heater can be applied.
- the urethane resin a was synthesized by reacting the polyol component and the isocyanate component in a methyl ethyl ketone solvent at 80 ° C. to obtain a urethane prepolymer.
- the urethane prepolymer was emulsified in an aqueous solution of dimethyl sulfate (30 parts) and then reacted in a 10% aqueous solution of a chain extender, and then the solvent was removed to obtain a urethane resin a.
- Epoxy resin b1 was synthesized by reacting at 140 ° C. with stirring while introducing nitrogen gas in a four-necked flask containing the above components 1 to 3 and 125 parts of propylene glycol monomethyl ether acetate. A solution was obtained. Next, 343.3 parts of propylene glycol monomethyl ether acetate and 8.2 parts of hexamethylene diisocyanate were added and reacted at 65 ° C. with stirring to obtain a modified polymer epoxy resin solution. Next, 92.7 parts of propylene glycol monomethyl ether acetate and the above component 4 were added and reacted at 65 ° C. with stirring. After completion of the reaction, 154.7 parts of propylene glycol monomethyl ether acetate was added, and the amine-modified epoxy resin b1 An aqueous solution was obtained.
- the epoxy resin b2 was synthesized by placing the above component 1 and ethylene glycol dimethyl ether (479.3 g) in a three-necked flask and raising the temperature to 60 ° C. to dissolve. Next, Component 2 was added, the temperature was raised to 85 ° C., and the viscosity was measured by sampling after 4 hours and after 5 hours, respectively. After confirming that the viscosity became constant, the mixture was cooled to 70 ° C., 284.0 parts of lactic acid was added and mixed for 30 minutes, and 2591.9 parts of ion-exchanged water was added while stirring, and the solid content was 25%. And a colloidal dispersion solution of amine epoxy resin b2 having a viscosity of 520 cps was obtained.
- methyl methacrylate (molecular weight: 100) 20 parts, butyl acrylate (molecular weight: 128) 40 parts, 2-hydroxypropyl methacrylate (molecular weight: 144) 10 parts, styrene (molecular weight: 104) 10 parts, N, 20 parts of N-dimethylaminopropyl methacrylate (molecular weight: 175) ” was used.
- Acrylic resin c was synthesized by a 10% by weight aqueous emulsifier solution in which a reactive emulsifier “Adeka Resorb NE-20” (manufactured by ADEKA Corporation) and a nonionic emulsifier “Emulgen 840S” (manufactured by Kao Corporation) were mixed at a ratio of 6: 4.
- S-1) 100 parts of the above monomer was mixed and emulsified with a homogenizer at 5000 rpm for 10 minutes to obtain a monomer emulsion (ER).
- emulsifier aqueous solution 150 parts was added to a four-necked flask equipped with a stirrer, a reflux condenser, a thermometer, and a monomer supply pump, and the temperature was kept at 40 to 50 ° C. % Aqueous solution (50 parts) and the above monomer emulsion (ER) were placed in a dropping funnel, attached to another mouth of the flask, dropped over about 2 hours, and the temperature was raised to 60 ° C. Stir for 1 hour. The mixture was cooled to room temperature with stirring to obtain an emulsion solution of acrylic resin c.
- Polyacrylamide: symbol e A copolymer (average molecular weight: 20000) of acrylamide (80% by mass) and methacrylic acid (20% by mass) was used.
- Glycerylated chitosan having the following structural formula (number average molecular weight: 1 to 100,000, glycerylated 1.1) was used.
- Polyacrylic acid symbol g
- Polyacrylic acid (number average molecular weight: 30000) was used.
- Polyethyleneimine Symbol h
- Polyethyleneimine (number average molecular weight: 1600) was used.
- methyl methacrylate (molecular weight: 100) 20 parts, butyl acrylate (molecular weight: 128) 55 parts, 2-hydroxypropyl methacrylate (molecular weight: 144) 10 parts, styrene (molecular weight: 104) 10 parts, N, 5 parts of N-dimethylaminopropyl methacrylate (molecular weight: 175) was used.
- the synthesis of the acrylic resin i was performed in the same manner as the acrylic resin c.
- Polyethyleneimine Symbol j
- Polyethyleneimine (number average molecular weight: 10,000) was used.
- Epoxy resin Symbol k
- Component 1 "Bisphenol A-based epoxy resin (Opika Shell Epoxy, Epicoat 828) (epoxy equivalent: 187 g) 235.7 parts”
- Component 2 "Bisphenol A 59.4 parts”
- Component 3 "Reaction catalyst (salt Lithium) 0.1 part ”and component 4“ diethanolamine 7 parts ”.
- the epoxy resin k was synthesized in the same manner as the epoxy resin b.
- Table 1 summarizes the prepared water-based resins. As shown in Table 1, aqueous resins a, b1, b2, and c are classified as aqueous resins (P1), and aqueous resins d, e, and f are classified as aqueous resins (P2). The water-based resins g, i, and k are classified as a water-based resin (P1), and the water-based resins h and j are classified as a water-based resin (P2).
- M1 Chromium diphosphate Cr (H 2 PO 4 ) 3
- M2 chromium fluoride CrF 3 ⁇ 3H 2 O
- M3 zirconium hydrofluoric acid
- V5 Vanadium acetylacetonate VO (C 5 H 7 O 2 ) 2
- Metal surface treatment agent The metal surface treatment agents of Examples 1 to 39 and the metal surface treatment agents of Comparative Examples 1 to 11 shown in Tables 2 to 4 were prepared by combining the water-based resin and the water-soluble metal compound.
- An aluminum alloy plate (JIS A3004, plate thickness 0.26 mm) was spray degreased with a 2% aqueous solution of fine cleaner 4377K (an alkaline degreasing agent manufactured by Nihon Parkerizing Co., Ltd.) at 50 ° C. for 10 seconds, and then washed with water to clean the surface . Then, in order to evaporate the water
- fine cleaner 4377K an alkaline degreasing agent manufactured by Nihon Parkerizing Co., Ltd.
- a surface treatment film was formed on the surface of the aluminum alloy plate by drying at 200 ° C. for 1 minute in an oven.
- the aluminum alloy plate on which the surface treatment film was formed was heat laminated to a polyester film (film thickness 16 ⁇ m) at 250 ° C. for 5 seconds (180 ° C. at the ultimate plate temperature) so that the surface pressure was 50 kg / cm 2.
- a coated metal plate was produced.
- a coated metal plate formed by laminating a resin film was deep drawn by a drawing ironing test.
- the coated metal plate punched to a diameter of 160 mm was drawn (first time) to produce a cup having a diameter of 100 mm.
- the cup was again drawn to a diameter of 75 mm (second time), and further drawn to a diameter of 65 mm (third time) to prepare a can as a test material.
- the ironing (thinning) ratios in the first drawing, the second drawing, and the third drawing were 5%, 15%, and 15%, respectively.
- the metal surface treatment agents of Examples 1 to 39 can form a surface treatment film having excellent adhesion to the laminate film on the surface of the metal material.
- the metal surface treatment agents of Comparative Example 1 and Comparative Example 2 that do not contain a water-soluble metal compound and the metal surface treatment agent of Comparative Example 3 that has an aqueous resin that does not contain a nitrogen-containing functional group are all poor in adhesion. A surface treatment film was formed. In particular, the durability adhesion and the acid resistance adhesion were remarkably inferior. This cause is thought to be due to insufficient corrosion resistance.
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Abstract
Description
本発明に係る表面処理皮膜2は、図1に示すように、金属材料1の表面(以下「金属表面」という。)に塗布形成された表面処理皮膜であって、その表面処理皮膜2に含まれる窒素と炭素の質量比(N/C)が0.005~0.5であり、且つ、Cr(III)、Zr、Ti、V、Nb、Mo、W及びCeから選ばれる金属元素の合計と炭素の質量比(TM/C)が0.01~1.3である。この表面処理皮膜2は、図1に示すように、後述する本発明に係る金属表面処理剤を金属表面に塗布した後、所定の温度で加熱乾燥して得られた皮膜であり、金属材料1とラミネートフィルム(又は樹脂塗膜)3との間に設けられる。
本発明に係る金属表面処理剤は、上記本発明に係る表面処理皮膜を得るための処理剤であって、以下の2態様の金属表面処理剤を提供する。
第1の金属表面処理剤は、ウレタン樹脂、エポキシ樹脂、アクリル樹脂、ポリオレフィン系樹脂、ホルマリン縮合樹脂、天然多糖類、ポリエステル、ポリアミド及びポリアクリルアミドから選ばれる1種又は2種以上の水系樹脂(P)を用いる。この態様では、通常、1~3種の水系樹脂を配合して用いるが、それ以上であっても構わない。
第1及び第2の金属表面処理剤において、含まれる水溶性金属化合物としては、Cr(III)、Zr、Ti、V、Nb、Mo、W及びCeから選ばれる1種又は2種以上の金属元素を含む水溶性金属化合物を挙げることができる。なお、Cr(III)としたのは、六価クロムを含まないという意味である。
金属表面処理剤を構成する溶媒は、水を主体とするが、皮膜の乾燥性改善等、必要に応じてアルコール系、ケトン系、又はセロソルブ系の水溶性有機溶剤の併用を妨げるものではない。
この他に、界面活性剤、消泡剤、レベリング剤、防菌防ばい剤、着色剤、及び硬化剤等、本発明の趣旨及び皮膜性能を損なわない範囲で添加し得る。また、皮膜の耐食性を向上させるため、メチロール化メラミン、カルボジイミド、及びイソシアネート等の有機架橋剤、及び、密着性向上のため、γ-グリシドキシプロピルトリエトキシシラン、γ-グリシドキシプロピルトリエトキシシラン、γ-アミノプロピルトリエトキシシラン、及びN-β-アミノエチル-γ-アミノプロピルトリメトキシシラン等のシランカップリング剤を、本発明の趣旨及び皮膜性能を損なわない範囲で添加し得る。
本発明に係る金属表面処理剤は、図1に示すように、被処理物である金属材料1の表面に塗布され、本発明に係る表面処理皮膜2を形成する。ここで、被処理物である金属材料1は特に限定されず、各種のものを適用できる。特に本発明では、金属材料1の表面に表面処理皮膜2を形成した後に樹脂フィルム(3)をラミネートし又は樹脂塗膜(3)を形成し、その後に深絞り加工、しごき加工又はストレッチドロー加工等の厳しい成形加工を施すことができる金属材料が好ましく用いられる。なお、図1では、金属材料1の一方の表面に表面処理皮膜2と樹脂フィルム又は樹脂塗膜(3)を形成した例を示しているが、金属材料1の両面に、すなわち他方の表面にも表面処理皮膜を形成し、さらに樹脂フィルム又は樹脂塗膜を設けてもよい。
本発明に係る金属表面処理方法は、上述した金属表面処理剤を金属表面に塗布した後、60~250℃の温度で加熱乾燥する方法である。ここで、「金属表面」とは、表面処理皮膜を形成する対象となる金属材料の表面のことである。金属材料の表面は、必要に応じて脱脂され、洗浄される。脱脂剤は、金属基材に適した各種のものから選択できる。また、洗浄液は、通常、水が用いられるが、水溶性溶剤又は界面活性剤水溶液等であってもよい。また、脱脂手段や洗浄手段は特に制限はなく、スプレー法、又は浸漬法等が好適に用いられる。
(ウレタン樹脂:記号a)
モノマー組成を、ポリオール成分「イソフタル酸と1,6ヘキサンジオールのポリエステルポリオール(数平均分子量:2000)200部、トリメチロールプロパン(分子量:134)5部、N-メチル-ジエタノールアミン(分子量:119)32部」、イソシアネート成分「イソホロンジイソシアネート(分子量:222)118部」、鎖伸長剤「エチレンジアミン(分子量:60)5部」とした。
成分1「ビスフェノールA系エポキシ樹脂(油化シェルエポキシ株式会社製、エピコート828)(エポキシ当量:187g)235.7部」、成分2「ビスフェノールA 59.4部」、成分3「反応触媒(塩化リチウム)0.1部」、成分4「ジエタノールアミン14部」とした。
成分1「ビスフェノールA-ジグリシジルエーテル系エポキシ樹脂(三井化学株式会社製、エポミックR302)(エポキシ当量:475g)1000部」、成分2「3-アミノプロパノール118.4部」とした。
モノマー組成として、「メタクリル酸メチル(分子量:100)20部、ブチルアクリレート(分子量:128)40部、2-ヒドロキシプロピルメタクリレート(分子量:144)10部、スチレン(分子量:104)10部、N,N-ジメチルアミノプロピルメタクリレート(分子量:175)20部」を用いた。
下記構造式のビスフェノール型カチオン変性フェノール樹脂を用いた。下記構造式中、重合度(m+n)は10~15であり、n/mは40/60である。
アクリルアミド(80質量%)とメタクリル酸(20質量%)との共重合体(平均分子量:20000)を用いた。
下記構造式のグリセリル化キトサン(数平均分子量:1~10万、グリセリル化1.1)を用いた。
ポリアクリル酸(数平均分子量:30000)を用いた。
ポリエチレンイミン(数平均分子量:1600)を用いた。
モノマー組成として、「メタクリル酸メチル(分子量:100)20部、ブチルアクリレート(分子量:128)55部、2-ヒドロキシプロピルメタクリレート(分子量:144)10部、スチレン(分子量:104)10部、N,N-ジメチルアミノプロピルメタクリレート(分子量:175)5部」を用いた。アクリル樹脂iの合成は、アクリル樹脂cと同様に行った。
ポリエチレンイミン(数平均分子量:10000)を用いた。
成分1「ビスフェノールA系エポキシ樹脂(油化シェルエポキシ株式会社製、エピコート828)(エポキシ当量:187g)235.7部」、成分2「ビスフェノールA 59.4部」、成分3「反応触媒(塩化リチウム)0.1部」、成分4「ジエタノールアミン7部」とした。エポキシ樹脂kの合成は、エポキシ樹脂bと同様に行った。
用いた水溶性金属化合物(M)を以下に示す。
M1:重リン酸クロム Cr(H2PO4)3
M2:フッ化クロム CrF3・3H2O
M3:ジルコニウムフッ化水素酸 H2ZrF6
M4:チタンフッ化水素酸 H2TiF6
M5:バナジウムアセチルアセトネート VO(C5H7O2)2
上記した水系樹脂と水溶性金属化合物とを組み合わせ、表2~表4に示す実施例1~39の金属表面処理剤と、比較例1~11の金属表面処理剤を準備した。
アルミニウム合金板(JIS A3004、板厚0.26mm)をファインクリーナー4377K(日本パーカライジング株式会社製のアルカリ脱脂剤)の2%水溶液で50℃・10秒間スプレー脱脂した後、水洗して表面を清浄した。続いて、アルミニウム合金板の表面の水分を蒸発させるために、80℃で1分間、加熱乾燥した。脱脂洗浄したアルミニウム合金板の表面に、表2に示した実施例1~39及び比較例1~11の金属表面処理剤の5質量%水溶液をバーコート(#3バー)によって塗布し、熱風循環式乾燥炉内で200℃、1分間乾燥し、アルミニウム合金板の表面に表面処理皮膜を形成した。表面処理皮膜を形成したアルミニウム合金板に、ポリエステル系フィルム(膜厚16μm)を250℃で5秒間(到達板温で180℃)、面圧が50kg/cm2になるようにヒートラミネートして「被覆金属板」を作製した。
被覆金属板を深絞り加工した後の初期密着性、耐久密着性及び耐酸密着性を以下のようにして評価した。さらに、薬剤安定性についても以下のようにして評価した。その結果を表5に示した。
深絞り加工した後の供試材について、初期密着性を評価した。缶が作製でき、フィルムの剥離がないものを「○」とし、缶は作製できるがフィルムが一部剥離したものを「△」とし、破断して缶が作製できないものを「×」とした。また、「○」の中で、全く剥離が見られず特に外観に優れるものを「◎」とした。
深絞り加工した後の供試材について、加熱加圧蒸気の雰囲気下でレトルト試験を実施した。レトルト試験は、市販の滅菌装置(オートクレーブ)を用い、125℃・1時間で行った。試験後の供試材について、フィルムの剥離がないものを「○」とし、フィルムの一部が剥離したものを「△」とし、フィルムが全面剥離したものを「×」とした。また、「○」の中で、全く剥離が見られず特に外観に優れるものを「◎」とした。
深絞り加工した後の供試材について、50℃の0.5%HF水溶液中に16時間浸漬した後の密着性を評価した。フィルムの剥離がないものを「○」とし、フィルムの一部が剥離したものを「△」とし、フィルムが全面剥離したものを「×」とした。また、「○」の中で、全く剥離が見られず特に外観に優れるものを「◎」とした。
表2~表4に示す実施例1~39及び比較例1~11の金属表面処理剤(薬剤)それぞれ200ccを300ccのポリ容器にそれぞれ封入し、20℃の雰囲気中で2週間静置した後の薬剤の状態を評価した。固化、分離及び沈殿のないものを「○」とし、固化と分離はないが沈殿のあるものを「△」とし、固化と分離のあるものを「×」とした。また、「○」の中で、全く固化、分離及び沈殿が見られず特に安定性に優れるものを「◎」とした。
2 表面処理皮膜
3 ラミネートフィルム又は樹脂塗膜
10 表面処理皮膜を有する金属材料
Claims (6)
- 金属材料の表面に塗布形成された表面処理皮膜であって、該表面処理皮膜に含まれる窒素と炭素の質量比(N/C)が0.005~0.5であり、且つ、Cr(III)、Zr、Ti、V、Nb、Mo、W及びCeから選ばれる金属元素の合計と炭素の質量比(TM/C)が0.01~1.3であることを特徴とする表面処理皮膜。
- 請求項1に記載の表面処理皮膜を得るための金属表面処理剤であって、
ウレタン樹脂、エポキシ樹脂、アクリル樹脂、ポリオレフィン系樹脂、ホルマリン縮合樹脂、天然多糖類、ポリアミド及びポリアクリルアミドから選ばれる1種又は2種以上の水系樹脂と、Cr(III)、Zr、Ti、V、Nb、Mo、W及びCeから選ばれる1種又は2種以上の金属元素を含む水溶性金属化合物とを含有し、
前記水系樹脂のうち少なくとも1種が、下記構造式(1)~(8)から選ばれる1種又は2種以上の含窒素官能基を有することを特徴とする金属表面処理剤。
(構造式(1)~(8)において、R1、R2、R3は、それぞれ独立に、水素、又は、炭素数1~10の直鎖、分岐鎖若しくは環状のアルキル基、アルケニル基、ヒドロキシアルキル基、ヒドロキシアルケニル基、アリール基、アリールアルキル基、ヒドロキシアリール基又はヒドロキシアリールアルキル基である。Xは、水酸イオン、ハロゲンイオン、硫酸イオン、スルホン酸イオン、リン酸イオン及びホスホン酸イオンから選ばれる1種又は2種以上である。)
- 請求項1に記載の表面処理皮膜を得るための金属表面処理剤であって、
ウレタン樹脂、エポキシ樹脂及びアクリル樹脂から選ばれる1種又は2種以上の第1水系樹脂と、ポリオレフィン系樹脂、ホルマリン縮合樹脂、天然多糖類、ポリアミド及びポリアクリルアミドから選ばれる1種又は2種以上の第2水系樹脂と、Cr(III)、Zr、Ti、V、Nb、Mo、W及びCeから選ばれる1種又は2種以上の金属元素を含む水溶性金属化合物とを含有し、
前記第1水系樹脂及び第2水系樹脂のうち少なくとも1種が、下記構造式(1)~(8)から選ばれる1種又は2種以上の含窒素官能基を有することを特徴とする金属表面処理剤。
(構造式(1)~(8)において、R1、R2、R3は、それぞれ独立に、水素、又は、炭素数1~10の直鎖、分岐鎖若しくは環状のアルキル基、アルケニル基、ヒドロキシアルキル基、ヒドロキシアルケニル基、アリール基、アリールアルキル基、ヒドロキシアリール基又はヒドロキシアリールアルキル基である。Xは、水酸イオン、ハロゲンイオン、硫酸イオン、スルホン酸イオン、リン酸イオン及びホスホン酸イオンから選ばれる少なくとも1種である。)
- 前記含窒素官能基を含む水系樹脂の該含窒素官能基1個当たりの数平均分子量が、50~3000であり、前記金属表面処理剤中の全固形分に対する前記水溶性金属化合物が、金属換算で1~50質量%含まれる、請求項2又は3に記載の金属表面処理剤。
- 請求項2~4のいずれか1項に記載の金属表面処理剤を金属材料の表面に塗布した後、60~250℃の温度で加熱乾燥することを特徴とする金属表面処理方法。
- 請求項1に記載の表面処理皮膜を有する金属材料。
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KR101443995B1 (ko) | 2014-09-23 |
TWI473908B (zh) | 2015-02-21 |
CN102741455B (zh) | 2015-03-11 |
TW201139735A (en) | 2011-11-16 |
KR20120120381A (ko) | 2012-11-01 |
JP5860583B2 (ja) | 2016-02-16 |
JP2011157586A (ja) | 2011-08-18 |
CN102741455A (zh) | 2012-10-17 |
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