Agent for improving light resistance of anodized film on dyed aluminum or aluminum alloy, and method for improving light resistance of film

Abstract

In this invention, excellent dye fastness is imparted to an anodic oxide film of dyed aluminum or aluminum alloy by using a surface treatment agent which contains a phosphoric species, a phosphate, or a chelating agent containing phosphor in the structure thereof.

Description

[Technical field]

[0001] The present invention relates to an agent for improving the light resistance of an anodized coating of dyed aluminum or an aluminum alloy, and a method for improving the light resistance of the coating. [Background technology]

[0002] An anodized film is formed on light metals such as aluminum and aluminum alloys, and the light metals on which the anodized film is formed are used for various purposes. Such an anodized film formed on aluminum, etc. is dyed (colored) with dyes such as organic dyes depending on the purpose. After the anodized film is dyed with dyes, it may be exposed to light such as ultraviolet light, causing the color of the dye to fade and change in color (hue).

[0003] There is a demand for surface treatment technology that can improve the light resistance of films such as anodized films and prevent discoloration of light metals such as aluminum and aluminum alloys that have been dyed with dyes, while maintaining their design.

[0004] Furthermore, in recent years, from the viewpoint of reducing the use of environmentally hazardous substances, there has been a demand for surface treatment techniques that do not contain halogen compounds, nitric acid-based nitrogen, and the like.

[0005] Patent Document 1 describes a surface formed with an anode of aluminum and / or an aluminum alloy. A method for impregnation is disclosed which comprises contacting a pigmented or unpigmented surface with an aqueous solution comprising one or more of the following anionic surface-active compounds containing at least one sulfonic acid group, phosphonic acid group and / or phosphonite group:

[0006] The present applicant has developed a surface treatment agent for dyed anodized films of aluminum or aluminum alloys, which contains a zirconium fluoride salt and has a pH of 3.4 or less, as a technology that can impart excellent dye fixation to dyed anodized films of aluminum or aluminum alloys and that can suppress fading when the anodized film is irradiated with light, thereby enabling the film to exhibit excellent light resistance (Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Special table flat 04-502647 [Patent Document 2] Patent No. 6490878 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a new technique for improving the light resistance of an anodized coating on dyed aluminum or an aluminum alloy. [Means for solving the problem]

[0009] The present inventors have conducted intensive research to achieve the above-mentioned object, and as a result, have found that the light resistance can be improved satisfactorily by using a surface treatment agent containing a phosphate or a chelating agent having phosphorus in its structure, and have completed the present invention.

[0010] That is, the present invention relates to the following techniques for improving light resistance.

[0011] Section 1. A light resistance improver for a coating, the coating is a dyed anodized coating of aluminum or an aluminum alloy; A light resistance improver comprising at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents.

[0012] Section 2. 2. The light resistance improver according to item 1, wherein the phosphoric acid is at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

[0013] Section 3. Item 2. The light resistance improver according to item 1, wherein the phosphate is at least one salt selected from the group consisting of a sodium salt, a potassium salt, an ammonium salt, an alkaline earth metal salt, and a metal salt of at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

[0014] Section 4. 2. The light resistance improver according to item 1, wherein the phosphorus-containing chelating agent is at least one chelating agent selected from the group consisting of inorganic chelating agents and organic chelating agents.

[0015] Section 5. 5. The light resistance improver according to any one of items 1 to 4, containing the phosphorus compound at 1 mg / L to 5,000 mg / L.

[0016] Section 6. 6. The light resistance improver according to any one of items 1 to 5, further comprising a dye.

[0017] Section 7. 6. The light fastness improver according to any one of items 1 to 5, which is a pretreatment agent for dyeing using a dye.

[0018] Section 8. 6. The light resistance improver according to any one of items 1 to 5, which is a post-treatment agent for dyeing using a dye.

[0019] Section 9. 9. The light resistance improver according to any one of items 6 to 8, wherein the dye is an organic dye.

[0020] Section 10. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. A step of immersing the film in a light resistance improver containing at least one phosphorus compound. The method comprising:

[0021] Section 11. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. and a step of immersing the film in a light resistance enhancer containing at least one phosphorus compound and a dye. , The method comprising:

[0022] Section 12. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. A step of immersing the substrate in a light resistance improver containing at least one phosphorus-based compound having a light resistance improving effect; and (2) dyeing the coating obtained in the step (1); The method comprising:

[0023] Section 13. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) dyeing the coating; and (2) The coating obtained in the step (1) is treated with a light resistance improver containing at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents. immersing the The method comprising: Effect of the Invention

[0024] The present invention can provide a technique for improving the light resistance of an anodized coating on dyed aluminum or aluminum alloy. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The present invention will be described in detail below.

[0026] (1) Light resistance improver for film The present invention is an agent for improving the light resistance of a film.

[0027] In the present invention, the coating is a dyed anodized coating of aluminum or an aluminum alloy.

[0028] The light resistance improver for the coating of the present invention (sometimes simply referred to as "light resistance improver") contains at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents.

[0029] By using the light resistance improver of the present invention, it is possible to improve the light resistance of the film as a surface treatment of the film.

[0030] The present invention can improve the light resistance of the coating, and therefore preferably, after the surface treatment, a sealing treatment is carried out, whereby discoloration when the coating after the sealing treatment is irradiated with light is suppressed, and excellent light resistance can be exhibited.

[0031] The present invention can improve the light resistance of the coating, and since a sealing treatment is preferably performed, the resulting article can exhibit excellent light resistance by suppressing fading when the coating of the article is irradiated with light.

[0032] The dyeing is preferably performed with an organic dye.

[0033] The present invention is a surface treatment technology that can suppress fading of films such as anodized films and improve light resistance of light metals such as aluminum and aluminum alloys that have been dyed with dyes, and can maintain design. The present invention is a surface treatment method that does not necessarily contain halogen compounds, nitric acid nitrogen, etc., and is a surface treatment technology that can reduce the use of environmentally hazardous substances.

[0034] Phosphates and phosphate salts The phosphoric acid contained in the light resistance improver of the present invention is preferably at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

[0035] The phosphate contained in the light resistance improver of the present invention is preferably at least one salt selected from the group consisting of sodium salts, potassium salts, ammonium salts, alkaline earth metal salts, and metal salts of at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

[0036] The phosphoric acid contained in the light resistance improver of the present invention is preferably a sodium salt of phosphoric acid, since this provides a coating with even more excellent light resistance.

[0037] Phosphorus-containing chelating agents The phosphorus-containing chelating agent contained in the light resistance improver of the present invention is preferably at least one chelating agent selected from the group consisting of inorganic chelating agents and organic chelating agents.

[0038] Among the chelating agents having phosphorus, the inorganic chelating agent having phosphorus is not particularly limited. The inorganic chelating agent having phosphorus is preferably pyrophosphoric acid and its salts, polyphosphoric acid and its salts, hexametaphosphoric acid and its salts, metaphosphoric acid and its salts, tripolyphosphoric acid and its salts, tetrapolyphosphoric acid and its salts, etc.

[0039] The salt of the inorganic phosphorus-containing chelating agent is not particularly limited, and is at least one salt selected from the group consisting of lithium salts, sodium salts, potassium salts, ammonium salts, alkaline earth metal salts, and metal salts.

[0040] Among the phosphorus-containing chelating agents, the organic phosphorus-containing chelating agent is not particularly limited. The organic phosphorus-containing chelating agent is preferably aminotrimethylenephosphonic acid and its salts; hydroxyethylidene diphosphonic acid and its salts; nitrilotrismethylenephosphonic acid and its salts; phosphonobutane tricarboxylic acid and its salts; ethylenediaminetetramethylenephosphonic acid and its salts; diethylenetriaminepentamethylenephosphonic acid and its salts; vinylphosphonic acid and its salts; phenylphosphoric acid and its salts; β-glycerophosphoric acid and its salts; DL-2-aminophosphonobutyric acid and its salts; diphenylphosphoric acid and its salts; phosphonic acid and its salts; aminomethylphosphonic acid and its salts; phosphonoformic acid and its salts, etc.

[0041] The salt of the organic phosphorus-containing chelating agent is not particularly limited, and is at least one salt selected from the group consisting of lithium salts, sodium salts, potassium salts, ammonium salts, alkaline earth metal salts, and metal salts.

[0042] As the phosphorus-containing chelating agent contained in the light resistance improver of the present invention, nitrilotrismethylenephosphonic acid and its sodium salt; and phosphonobutanetricarboxylic acid and its sodium salt are preferably used, in that the light resistance of the coating film is further improved.

[0043] The light resistance improver of the present invention is at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents, either singly or in combination. It can be used as such.

[0044] Phosphorus Compound Content The content of the phosphorus-based compound contained in the light resistance improver of the present invention is preferably 1 mg / L to 5,000 mg / L. / L, and more preferably, 10 mg / L to 200 mg / L.

[0045] The light resistance can be further improved by adjusting the content of the phosphorus-based compound to preferably 1 mg / L or more, and the light resistance can be further improved by adjusting the content of the phosphorus-based compound to preferably 5,000 mg / L or less.

[0046] The light resistance improver of the present invention is excellent in that, by adjusting the content of the phosphorus compound within the above-mentioned preferred condition range, it is possible to suppress discoloration of the film during surface treatment and to suppress powdering and fogging, which are defects in appearance, on the surface of the anodized film.

[0047] pH The pH of the light resistance improver of the present invention is preferably 2-9, and more preferably 4-7.

[0048] The light resistance can be further improved by adjusting the pH of the light resistance improver to preferably 4 or more. By adjusting the pH of the light fastness improver to preferably 7 or less, the light fastness can be further improved, and at the same time, a uniform dyeing appearance without unevenness can be obtained. It is possible to suppress color loss due to dye detachment and obtain a uniform dyed appearance.

[0049] aqueous solution The light resistance improver of the present invention is preferably in the form of an aqueous solution.

[0050] Other Ingredients The light resistance improver of the present invention can contain additive components such as a pH buffer, a pH adjuster, a surfactant, and a fungicide, if necessary, for the purpose of further improving the light resistance during surface treatment, further improving the practical use of the light resistance improver, and the like.

[0051] As the additive, preferably, for example, an antifungal agent such as benzoic acid or a benzoate is used. The antifungal agent is a commercially available antifungal agent, preferably, for example, "TAC Kabicolon" (Okuno Chemical Industries, Ltd.). (manufactured by Co., Ltd.) is used.

[0052] Staining solution The light fastness improver of the present invention preferably further contains a dye. The light fastness improver of the present invention is preferably used as a dyeing solution.

[0053] Dyeing pretreatment agent The light fastness improver of the present invention is preferably a pretreatment agent used in pretreatment for dyeing with a dye. The light fastness improver of the present invention is preferably used as a pretreatment agent for dyeing.

[0054] Post-dyeing treatment agent The light fastness improver of the present invention is preferably a post-treatment agent used in a post-treatment of dyeing using a dye. The light fastness improver of the present invention is preferably used as a post-treatment agent of dyeing.

[0055] dye The dye used for dyeing to which the light fastness improver of the present invention is applied is preferably an organic dye.

[0056] The organic dye is not particularly limited, and is preferably an azo-based, metal complex azo-based, anthraquinone-based, phthalocyanine-based, xanthene-based, or quinoline-based organic dye.

[0057] Coating The coating to which the light resistance improver of the present invention is applied is an anodized coating of aluminum or an aluminum alloy, or a dyed anodized coating of aluminum or an aluminum alloy.

[0058] (2) Method for improving the light resistance of the film The present invention is a method for improving the lightfastness of a coating.

[0059] The coating is a dyed anodized coating of aluminum or an aluminum alloy.

[0060] The method for improving the light resistance of the coating of the present invention includes the steps of: (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. and immersing the film in a light resistance improver containing at least one phosphorus-based compound that is known to be effective in improving light resistance.

[0061] When the light resistance improver of the present invention is added to a dye bath The method for improving the light resistance of a coating of the present invention preferably comprises the steps of: (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. and immersing the film in a light resistance enhancer containing at least one phosphorus compound that is capable of inhibiting the formation of a dye.

[0062] The method of the present invention for improving the light resistance of a coating exhibits the function of a dye solution.

[0063] The method for improving the light resistance of a film of the present invention includes a step of immersing (dyeing) the film in a light resistance improver (dye bath) containing the phosphorus compound and further a dye, thereby improving the light resistance of the film.

[0064] The method for improving the light resistance of a coating of the present invention preferably involves subjecting the coating to a pretreatment, anodizing treatment, dyeing treatment in a dye bath containing a light resistance improver and a dye, and sealing treatment, in that order.

[0065] When the light resistance improver of the present invention is applied before dyeing The method for improving the light resistance of a coating of the present invention preferably comprises the steps of: (1) The coating is formed by using a material selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus. A step of immersing the substrate in a light resistance improver containing at least one phosphorus-based compound having a light resistance improving effect; and (2) A step of dyeing the coating obtained in the step (1).

[0066] The method of the present invention for improving the light resistance of a coating exhibits the function of a pretreatment agent used in pretreatment for dyeing with a dye.

[0067] The method for improving the light resistance of a coating of the present invention includes a step of immersing the coating in a solution in which the phosphorus-based compound is dissolved prior to dyeing the coating, and this step serves as a light resistance improving treatment, thereby improving the light resistance of the coating.

[0068] The method for improving the light resistance of a coating of the present invention preferably involves subjecting the coating to a pretreatment, anodizing treatment, a light resistance improving treatment, a dyeing treatment using a dye bath containing a dye, and a sealing treatment, in that order.

[0069] When the light resistance improver of the present invention is applied after dyeing The method for improving the light resistance of a coating of the present invention preferably comprises the steps of: (1) dyeing the coating; and (2) A step of immersing the coating obtained by the step (1) in a light resistance improver containing at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents.

[0070] The method of the present invention for improving the light resistance of a coating exhibits the function of a post-treatment agent used in the post-treatment of dyeing with a dye.

[0071] The method for improving the light resistance of a coating of the present invention includes a step of immersing the coating in a solution in which the phosphorus-based compound is dissolved after dyeing the coating, and this step serves as a light resistance improving treatment, thereby improving the light resistance of the coating.

[0072] The method for improving the light resistance of a coating of the present invention preferably involves subjecting the coating to a pretreatment, anodizing treatment, dyeing treatment using a dye bath containing a dye, a light resistance improving treatment, and a sealing treatment, in that order.

[0073] The phosphorus-based compound, dye, and the like contained in the light resistance improver are the same as those described in the section on the light resistance improver.

[0074] Anodizing The method of the present invention for improving the light resistance of a film includes the step of forming an anodized film on aluminum or an aluminum alloy.

[0075] The anodizing treatment may be preferably carried out by a conventionally known method, in which the aluminum or aluminum alloy to be treated is immersed in an anodizing treatment solution to perform the anodizing treatment.

[0076] The electrolytic solution used in the anodizing treatment is not particularly limited, and preferably, for example, an electrolytic solution based on a sulfuric acid aqueous solution, an oxalic acid aqueous solution, a chromic acid aqueous solution, a sulfonic acid aqueous solution, etc. The liquid temperature of the electrolytic solution (treatment solution) is preferably, for example, about 0°C to 80°C, and more preferably , around 10℃~40℃.

[0077] The electrolysis method may be either AC or DC, but is preferably DC electrolysis since it allows rapid film growth and makes it easy to obtain a thick film.

[0078] The current density is, for example, 0.1 A / dm 2 ~10A / dm 2 Approximately, preferably 0.5 to 3 A / dm 2 About The power application time is usually about 10 to 100 minutes.

[0079] The thickness of the film formed by anodization is preferably about 2 μm to 50 μm, more preferably Preferably, it is about 5 μm to 20 μm, and is set arbitrarily depending on the application.

[0080] Before anodizing, the aluminum or aluminum alloy to be treated is first pretreated to remove any deposits. The pretreatment method is not particularly limited, and preferably, a known treatment method such as solvent washing, acid washing, weak alkali washing, acid etching, alkali etching, desmutting, or chemical polishing is appropriately applied depending on the type of material and the state of the deposits.

[0081] After the above-mentioned anodizing treatment is performed on aluminum or an aluminum alloy, the aluminum or aluminum alloy is dyed with a dyeing solution containing the light fastness improver of the present invention, or with a dyeing pretreatment agent containing the light fastness improver of the present invention, and then dyed with a dyeing solution.

[0082] Dyeing process The method for improving the light resistance of a coating according to the present invention includes the step of dyeing the coating, which is preferably an anodized coating of aluminum or an aluminum alloy.

[0083] The film to be dyed, preferably an anodized film of aluminum or an aluminum alloy, may be an anodized film obtained by applying a known anodizing method using sulfuric acid, oxalic acid, or the like to general aluminum or aluminum alloys.

[0084] The aluminum alloy is not particularly limited, and various aluminum-based alloys can be the subject of anodization. The aluminum alloy is preferably, specifically, The JIS-A 1,000 to 7,000 series of wrought alloys are designated by numbers, AC and ADC. These include various aluminum-based alloys, such as casting materials and die-cast materials.

[0085] The dyeing treatment is not particularly limited, and may be coloring with a dye. For coloring with a dye, a method of immersing the anodized film in a conventionally known aqueous dye solution may be used. The dye used is preferably a commercially available dye for anodized films of aluminum or aluminum alloys. The dye used is preferably, for example, an anionic dye.

[0086] For dyeing, an aqueous solution containing a dye (dye bath, dye solution, etc.) is preferably used.

[0087] The temperature of the aqueous solution containing the dye is preferably 10°C to 70°C, and more preferably 20°C to 60°C.

[0088] The concentration of the dye in the aqueous solution containing the dye and the immersion time can be appropriately set depending on the desired color tone and color strength.

[0089] The above-described dyeing process dyes the anodized film of aluminum or an aluminum alloy.

[0090] Light resistance improvement treatment In the method of the present invention for improving the light resistance of a film, this is a step for improving the light resistance of a dyed anodized film of aluminum or an aluminum alloy.

[0091] The light resistance improving treatment is a step of carrying out a surface treatment by immersing in a light resistance improving agent containing the phosphorus-based compound of the present invention.

[0092] As described above, the light resistance improving treatment is preferably carried out by using the light resistance improver of the present invention. When added to a dye bath containing a dye (when the lightfastness improver contains a dye), and / or when applied before a dyeing process using a dyebath containing a dye; This is the case when it is applied after a dyeing process using a dye bath containing a dye.

[0093] The method of the present invention for improving the light resistance of a film improves the light resistance of the film by a light resistance improving treatment.

[0094] When the light resistance improver contains a dye When the light resistance improver contains a dye, the temperature of the light resistance improver is preferably 10° C. to 80° C., and more preferably 20° C. to 60° C. By adjusting the temperature of the light resistance improver within the above range, the light resistance can be further improved.

[0095] The immersion time is not particularly limited, but is preferably 30 seconds to 30 minutes, and more preferably 1 minute. The immersion time is set appropriately so that the target color tone can be obtained. By adjusting the immersion time to the above range, the light resistance of the anodized film can be further improved within a range that provides excellent production efficiency.

[0096] When lightfastness enhancers are applied before dyeing When the light resistance improver is applied before the dyeing treatment, the temperature of the light resistance improver is preferably 10° C. to 80° C., and more preferably 20° C. to 60° C. By adjusting the temperature of the light resistance improver within the above range, the light resistance can be further improved.

[0097] The immersion time is preferably 30 seconds to 30 minutes, and more preferably 1 minute to 10 minutes. By adjusting the immersion time within the above range, it is possible to further improve the light resistance of the anodized film while still achieving excellent production efficiency.

[0098] After the above-mentioned lightfastness improving treatment, the film is washed with water and then immersed in a dyeing solution for the next step to dye the film. In this case, the water washing between the lightfastness improving treatment and the dyeing treatment can be omitted.

[0099] When lightfastness enhancers are applied after dyeing When the light resistance improver is applied after dyeing, the dyed film is thoroughly washed with water after dyeing and then immersed in the light resistance improver of the present invention.

[0100] The temperature of the light resistance improver is preferably 10° C. to 80° C., and more preferably 20° C. to 60° C. By adjusting the temperature of the light resistance improver within the above range, the light resistance can be further improved.

[0101] The immersion time is preferably 30 seconds to 30 minutes, and more preferably 1 minute to 10 minutes. By adjusting the immersion time within the above range, it is possible to further improve the light resistance of the anodized film while still achieving excellent production efficiency.

[0102] The coating is treated to improve its light resistance by the above-described light resistance improvement treatment.

[0103] (3) Sealing method The method for improving the light resistance of the coating of the present invention preferably involves subjecting the coating to pretreatment, anodizing treatment, dyeing treatment using a dye bath containing a dye, light resistance improving treatment, etc., and then preferably carrying out a sealing treatment.

[0104] The sealing treatment method is a step of sealing the coating that has been surface-treated by the light resistance improving treatment. The coating is preferably an anodized coating of aluminum or an aluminum alloy.

[0105] The sealing treatment is not particularly limited, and is preferably performed by a conventionally known sealing treatment method, which preferably involves immersing a film (preferably an anodized film of aluminum or an aluminum alloy) that has been surface-treated by a light resistance improving treatment, in a sealing treatment solution.

[0106] The sealing solution is not particularly limited, and preferably, a sealing solution containing a metal salt is used. The metal contained in the metal salt is preferably an alkali metal, an alkaline earth metal, a transition metal, or the like. Specifically, the metal is preferably Li, Be, Na, Mg, K, Ca, Rb, Sr, Cs Among the above metal salts, preferred are metal salts of Na, Mg, K, Ca, Ba, Mn, Ni, etc., and more preferred are metal salts of Mg, Ca, etc., in view of the excellent corrosion resistance of the sealing film (preferably an anodized film of aluminum or an aluminum alloy). , Mn, and Ni metal salts.

[0107] The sealing treatment solution may contain one type of the metal salt alone or a mixture of two or more types.

[0108] The concentration of the metal salt in the sealing treatment solution is not particularly limited, but is preferably 0.001 mol / L to 1 mol / L, and more preferably, 0.003 mol / L to 0.3 mol / L. By adjusting the concentration of in the above range, the sealing solution can exhibit sufficient sealing performance, and the corrosion resistance of the film sealed with the sealing solution can be further improved.

[0109] For the purpose of improving the sealing performance (appearance, corrosion resistance, etc.), the sealing treatment liquid preferably further contains additive components such as a pH buffer, a surfactant, etc. Examples of the additives include pH buffers or pH adjusters such as acetic acid, acetates, nitric acid, nitrates, benzoic acid, and benzoates; sulfonic acid-based dispersants such as sodium salt of naphthalenesulfonic acid-formalin condensate; and the like.

[0110] The pH of the sealing treatment solution is preferably 5.0 to 8.0, and more preferably 5.3 to 6.0. The pH of the sealing treatment solution is preferably adjusted to the above pH range using, for example, acids such as acetic acid, nitric acid, benzoic acid, sulfuric acid, etc., or alkalis such as sodium hydroxide, sodium carbonate, ammonia water, etc.

[0111] The temperature of the sealing treatment liquid (treatment temperature) is preferably from 80° C. to the boiling point, and more preferably from 85° C. to the boiling point.

[0112] The immersion time in the sealing treatment solution is preferably from 1 to 60 minutes, and more preferably from about 3 to 30 minutes.

[0113] By adjusting the treatment temperature and immersion time in the sealing solution within the above ranges, it is possible to prevent the coating after sealing from becoming powdery, improve the contamination resistance of the coating, and obtain corrosion resistance.

[0114] The sealing treatment solution preferably contains additive components such as antifungal agents as necessary for the purpose of improving the sealing performance and practical use of the solution. The additives preferably include antifungal agents such as benzoic acid and benzoates. The antifungal agents used are commercially available antifungal agents, preferably, for example, "TAC We use "Kabikoron" (manufactured by Okuno Chemical Industries Co., Ltd.).

[0115] The sealing treatment liquid preferably contains the above-mentioned metal salt, pH buffer, surfactant, etc., and other components are not particularly limited, and is preferably an aqueous solution.

[0116] According to the above-described sealing treatment method, the coating is surface-treated by the light resistance improving treatment, and discoloration of the coating after the sealing treatment when irradiated with light is suppressed, thereby enabling the coating to exhibit excellent light resistance.

[0117] The method of improving the light resistance of a film of the present invention is advantageous in that, by setting the above-mentioned preferred conditions within the range, powdering and fogging of the surface of the anodized film during surface treatment can be suppressed, resulting in poor appearance.

[0118] (4) Goods An article obtained by applying the light resistance improver of the present invention, or an article obtained by applying the method for improving the light resistance of a coating of the present invention, is preferably an article having a dyed anodized coating of aluminum or aluminum alloy that has been sealed by the above-mentioned sealing treatment method.

[0119] Since the article has a dyed anodized aluminum or aluminum alloy coating that has been sealed by the above-mentioned sealing method, its use is not particularly limited, and preferred uses include, for example, the exterior of electronic devices and the exterior of cosmetic products.

[0120] The article of the present invention has an anodized coating of aluminum or an aluminum alloy that has been surface-treated by the light resistance improving treatment and then sealed by the sealing treatment method. Therefore, the anodized coating of the article has excellent dye fixation properties and is inhibited from fading when the anodized coating of the article is irradiated with light, thereby enabling the article to exhibit excellent light resistance.

[0121] By using the light resistance improver of the present invention, it is possible to improve the light resistance of the film as a surface treatment of the film.

[0122] The present invention can improve the light resistance of the film, and therefore inhibits discoloration when the film after sealing treatment is irradiated with light, thereby enabling the film to exhibit excellent light resistance.

[0123] The present invention can improve the light resistance of the coating, and since a sealing treatment is preferably performed, the resulting article can exhibit excellent light resistance by suppressing fading when the coating of the article is irradiated with light.

[0124] The dyeing is preferably performed with an organic dye.

[0125] The present invention is a surface treatment technology that can suppress fading of anodized films of aluminum, aluminum alloys, etc. that have been dyed with dyes, improve light resistance, and maintain design. The present invention is a surface treatment method that does not necessarily contain halogen compounds, nitric acid nitrogen, etc., and is a surface treatment technology that can reduce the use of environmentally hazardous substances. EXAMPLES

[0126] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the examples.

[0127] According to the following manufacturing conditions, aluminum alloy test pieces that were anodized and dyed for use in the following Examples and Comparative Examples were manufactured.

[0128] Anodizing An aluminum alloy test piece (JIS A1050P plate) was degreased by immersing it in a weak alkaline degreasing solution (aqueous solution of 30 g / L of Top Alclean 404 (trade name) manufactured by Okuno Chemical Industries Co., Ltd., bath temperature 60° C.) for 5 minutes.

[0129] Next, the degreased aluminum alloy test piece was washed with water, and the washed aluminum alloy test piece was anodized (bath temperature 20°C ± 1°C, anode current density: 1A / dm) using an anodizing bath mainly composed of sulfuric acid (containing 180g / L of free sulfuric acid and 8.0g / L of dissolved aluminum).2 The electrolysis was performed for 30 minutes, and the film thickness was approximately 10 μm.

[0130] Dyeing process Next, the anodized film obtained is washed with water, and after washing, it is dyed by immersing it in a dyeing solution (aqueous solution) containing the following dye (bath temperature 55°C) for 1 minute, and then washed with water to obtain the anodized and dyed aluminum alloy. Aluminum alloy test pieces were obtained.

[0131] The dyes used for dyeing were TAC dye, TAC BLACK-GRLH (420), or TAC BLACK-GLH (402) manufactured by Okuno Chemical Industries Co., Ltd.

[0132] Lightfastness test method Testing machine: Suntest XLS+ (ATLAS), Light source: Xenon lamp Radiation intensity: 550W / m 2 , Irradiation temperature: 65℃ Irradiation time: 0hr, 25hr, 50hr, 100hr, and 300hr Color difference measurement: Integrating sphere spectrophotometer SP-64 (manufactured by X-rite) Color difference measurement items: ΔL* Δa* Δb* ΔE*ab The color difference after the light fastness test was confirmed based on the light fastness test time of 0 hours.

[0133] The smaller ΔE*ab is, the better the light resistance of the film is.

[0134] ΔE*ab = √{(ΔL*) 2 + (Δa*) 2 + (Δb*) 2} Examples and Comparative Examples in Tables 1 and 2 1 shows the results of a light fastness test when the light fastness improver of the present invention was added to a dye solution.

[0135] The dye used in the dye bath was TAC BLACK-GRLH (420), and dyeing was performed at pH 5.5, 55°C, with varying dye concentrations and immersion times to obtain similar color tones.

[0136] Table 1: Phosphates In Comparative Example 1, dyeing was performed in a dye bath containing only dye.

[0137] In Comparative Example 2, dyeing was performed in a dyebath containing an inorganic salt not containing phosphorus.

[0138] Examples 1 and 2 were dyed in a dyebath containing phosphate.

[0139] Table 2: Phosphorus-containing chelating agents Comparative Examples 3, 4, and 5 were dyed in a dyebath containing a phosphorus-free chelating agent.

[0140] In Examples 3 to 9, dyeing was performed in a dye bath containing a phosphorus-containing chelating agent.

[0141] Examples and Comparative Examples in Table 3 1 shows the results of a lightfastness test when the lightfastness improving treatment of the present invention was carried out before and after a dyeing treatment.

[0142] In Comparative Example 6, dyeing was performed in a dye bath containing only the dye.

[0143] In Example 10, 25 mg / L of hydroxyethylidenediphosphonic acid was added to the staining solution as a phosphorus-containing chelating agent.

[0144] In Example 11, a light fastness improving treatment was carried out before dyeing.

[0145] In Example 12, a light fastness improving treatment was carried out after dyeing.

[0146] In both Examples 11 and 12, a 25 mg / L aqueous solution of hydroxyethylidenediphosphonic acid was used as a phosphorus-containing chelating agent for the light resistance improvement treatment, at pH 5.5, 55° C., and 2 minutes. The dyeing treatment was performed with 2 g / L TAC BLACK-GLH(402) at 55° C., with varying immersion times to obtain similar color tones.

[0147] As shown in the light resistance test results in Tables 1 to 3, the present invention is advantageous in that the light resistance of an anodized film on aluminum or an aluminum alloy can be improved by using the light resistance improver of the present invention.

[0148] [Table 1]

[0149] [Table 2]

[0150] [Table 3]

Claims

1. A light resistance improver for a coating, the coating is a dyed anodized coating of aluminum or an aluminum alloy; At least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents; Further, the composition contains a dye. The phosphoric acid is at least one phosphoric acid selected from the group consisting of phosphorous acid and hypophosphorous acid. Light resistance improver.

2. 2. The light resistance improver according to claim 1, wherein the phosphate is at least one salt selected from the group consisting of a sodium salt, a potassium salt, an ammonium salt, an alkaline earth metal salt, and a metal salt of at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

3. 2. The light resistance improver according to claim 1, wherein the phosphorus-containing chelating agent is at least one chelating agent selected from the group consisting of inorganic chelating agents and organic chelating agents.

4. The light resistance improver according to any one of claims 1 to 3, containing the phosphorus compound at 1 mg / L to 5,000 mg / L.

5. The light resistance improver according to any one of claims 1 to 4, wherein the dye is an organic dye.

6. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) a step of immersing the coating in a light resistance improver containing at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and phosphorus-containing chelating agents, and further containing a dye; having The phosphoric acid is at least one phosphoric acid selected from the group consisting of phosphorous acid and hypophosphorous acid. method.

7. 7. The method of claim 6, wherein the phosphate is at least one salt selected from the group consisting of sodium salts, potassium salts, ammonium salts, alkaline earth metal salts, and metal salts of at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid.

8. The method according to claim 6, wherein the phosphorus-containing chelating agent is at least one chelating agent selected from the group consisting of inorganic chelating agents and organic chelating agents.

9. A method for improving the light resistance of a coating, comprising the steps of: the coating is a dyed anodized coating of aluminum or an aluminum alloy; (1) dyeing the coating; and (2) a step of immersing the coating obtained by the step (1) in a light resistance improver containing at least one phosphorus-based compound selected from the group consisting of phosphoric acids, phosphates, and chelating agents having phosphorus; having The phosphoric acid is at least one phosphoric acid selected from the group consisting of phosphorous acid and hypophosphorous acid, The phosphate is at least one salt selected from the group consisting of sodium salts, potassium salts, ammonium salts, and alkaline earth metal salts of at least one phosphoric acid selected from the group consisting of phosphoric acid, phosphorous acid, and hypophosphorous acid. method.

10. The method according to claim 9, wherein the phosphorus-containing chelating agent is at least one chelating agent selected from the group consisting of inorganic chelating agents and organic chelating agents.

11. The method according to any one of claims 6 to 10, wherein the light resistance improver contains the phosphorus-based compound at 1 mg / L to 5,000 mg / L.

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