Peeling liquid composition and method for producing recycled aluminum substrate

Abstract

To provide a peeling liquid composition capable of satisfactorily peeling a urethane resin layer while suppressing damage to the surface of an aluminum substrate when the urethane resin layer in contact with the surface of the aluminum substrate is peeled.SOLUTION: A peeling liquid composition includes an aromatic alcohol, a compatibilizer, water, alkanolamine, and an anionic surfactant, and the content A of the aromatic alcohol, the content B of the compatibilizer, and the content C of the water satisfy formula 1, X≥0.6, and formula 2, C≤(-1.80×X2+1.05×X+0.72)×100. In formula 1 and formula 2, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total of the content A and the content B of the compatibilizer.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a stripper composition and a method for producing a recycled aluminum substrate. [Background technology]

[0002] In electrophotographic image forming apparatuses (such as copiers, facsimiles, and printers), a toner image formed on the surface of an image carrier such as a photoconductor is transferred to the surface of a recording medium and fixed on the recording medium to form an image. These photoconductors have a resin layer on a metal substrate. From the perspective of recycling the substrate in the photoconductor, methods for peeling off the resin layer on the substrate have been investigated.

[0003] For example, Patent Document 1 discloses a technique in which a photoreceptor having a photosensitive layer containing a resin component on a conductive support is immersed in a stripping solution containing a dibasic acid ester, a stripping accelerator, and reducing electrolyzed water, and while applying a flow force to the stripping solution to mix the stripping solution uniformly, the photosensitive layer is stripped from the surface of the support by the flow force of the stripping solution, and the support from which the photosensitive layer has been stripped is washed with reducing electrolyzed water to obtain a recycled support, and a photosensitive layer is formed again on the recycled support to produce a new photoreceptor.

[0004] Patent Document 2 discloses a layer peeling method for an electrophotographic photoreceptor having a layer structure in which at least an intermediate layer, a charge generating layer, and a charge transport layer containing a binder resin are sequentially laminated on a conductive substrate, the method comprising immersing the electrophotographic photoreceptor in a stripping liquid that swells but does not dissolve the binder resin in the charge transport layer, and supplying compressed gas to the stripping liquid to swell and peel off the charge transport layer.

[0005] Patent Document 3 discloses a stripping liquid composition containing alkanolamines, aromatic alcohols, and an anticorrosive agent. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-044169 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-160394 [Patent Document 3] International Publication No. 2009 / 051237 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present disclosure is to provide a stripping liquid composition that, when stripping a urethane resin layer in contact with the surface of an aluminum substrate, can effectively strip the urethane resin layer while suppressing damage to the surface of the aluminum substrate, and a method for producing a recycled aluminum substrate that can effectively strip the urethane resin layer while suppressing damage to the surface of the aluminum substrate. [Means for solving the problem]

[0008] Means for solving the above problems include the following aspects. <1> The composition comprises an aromatic alcohol, a compatibilizer, water, an alkanolamine, and an anionic surfactant, The stripping liquid composition, wherein the content A of the aromatic alcohol, the content B of the compatibilizer, and the content C of the water satisfy the following formulas 1 and 2: Formula 1:X≧0.6 Formula 2: C≦(-1.80×X 2 +1.05×X+0.72)×100 (In Formula 1 and Formula 2, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer.) <2> a ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.6 or more and 0.8 or less; <1> The stripping liquid composition according to claim 1. <3> a ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.7 or more and 0.8 or less; <2> The stripping liquid composition according to claim 1. <4> The water content is 15% by mass or more and 35% by mass or less. <1> ~ <3> The stripping liquid composition according to any one of the preceding claims. <5> The water content is 20% by mass or more and 30% by mass or less. <4> The stripping liquid composition according to claim 1. <6> The content of the aromatic alcohols is 35% by mass or more and 60% by mass or less. <1> ~ <5> The stripping liquid composition according to any one of the preceding claims. <7> the aromatic alcohol is at least one selected from the group consisting of benzyl alcohol, 2-phenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, and 2,3-dimethoxybenzyl alcohol; <1> ~ <6> The stripping liquid composition according to any one of the preceding claims. <8> The aromatic alcohol is benzyl alcohol. <7> The stripping liquid composition according to claim 1. <9> The compatibilizer is a sodium benzenesulfonate. <1> ~ <8> The stripping liquid composition according to any one of the preceding claims. <10> the sodium benzenesulfonate is at least one selected from the group consisting of sodium 2,4-dimethylbenzenesulfonate, sodium 3,5-dimethylbenzenesulfonate, sodium 4-dodecylbenzenesulfonate, sodium cumenesulfonate, and sodium o-formylbenzenesulfonate; <9> The stripping liquid composition according to claim 1. <11> The sodium benzenesulfonate is sodium 2,4-dimethylbenzenesulfonate. <10> The stripping liquid composition according to claim 1. <12> The alkanolamines are at least one selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, isopropanolamine, triisopropanolamine, aminoethylethanolamine, 2-amino-2-methyl-1-propanol, diglycolamine, and n-methyl-2-pyrrolidone. <1> ~ <11> The stripping liquid composition according to any one of the preceding claims. <13> The alkanolamine is at least one selected from the group consisting of diethanolamine and isopropanolamine. <12> The stripping liquid composition according to claim 1. <14> The anionic surfactant includes a succinic acid type anionic surfactant and a phosphate ester type anionic surfactant. <1> ~ <13> The stripping liquid composition according to any one of the preceding claims. <15> A metal resin composite having an aluminum base material and a urethane resin layer in contact with the surface of the aluminum base material, <1> ~ <14> immersing the aluminum substrate in the stripping solution composition according to any one of claims 1 to 4, thereby removing the urethane resin layer from the aluminum substrate to obtain a recycled aluminum substrate. [Effects of the Invention]

[0009] <1> According to the invention, there is provided a stripper liquid composition that, when stripping a urethane resin layer in contact with the surface of an aluminum substrate, can effectively strip the urethane resin layer while suppressing damage to the surface of the aluminum substrate, compared to a stripper liquid composition that does not contain at least one selected from the group consisting of aromatic alcohols, compatibilizers, water, alkanolamines, and anionic surfactants, and a stripper liquid composition in which the aromatic alcohol content A, the compatibilizer content B, and the water content C do not satisfy at least one of formulas 1 and 2. <2> or <3> According to the invention, a stripping liquid composition is provided that can strip a urethane resin layer better than a stripping liquid composition having a ratio (A / (A+B)) of less than 0.6 or more than 0.8. <4> or <5> According to the present invention, a stripping liquid composition is provided that can suppress surface scratches on aluminum substrates compared to stripping liquid compositions having a water content of less than 15 mass % or more than 35 mass %. <6> According to the present invention, a stripping liquid composition is provided that can strip a urethane resin layer better than stripping liquid compositions containing less than 35% by mass or more than 60% by mass of aromatic alcohols. <7> or <8> According to the invention, a stripping liquid composition is provided that can strip a urethane resin layer better than a stripping liquid composition containing only 2-pyridinemethanol or 4-pyridinemethanol as an aromatic alcohol. <9> , <10> or <11> According to the invention, a stripping liquid composition is provided that can strip a urethane resin layer better than a stripping liquid composition containing only ethylene glycol monoethyl ether or ethylene glycol diethyl ether as a compatible solvent. <12> or <13> According to the invention, a stripping liquid composition is provided that can strip a urethane resin layer better than a stripping liquid composition containing only polyetheramine as an alkanolamine. <14> According to the present invention, a stripper liquid composition is provided that can suppress surface scratches on aluminum substrates compared to a stripper liquid composition that contains only one of a succinic acid type anionic surfactant and a phosphate ester type anionic surfactant as the anionic surfactant. <15> According to the present invention, there are provided a stripper solution composition that does not contain at least one selected from the group consisting of aromatic alcohols, compatibilizers, water, alkanolamines, and anionic surfactants, and a method for producing recycled aluminum substrates that can effectively strip a urethane resin layer while suppressing surface damage to the aluminum substrate, compared to when a stripper solution composition is used in which the aromatic alcohol content A, the compatibilizer content B, and the water content C do not satisfy at least one of formulas 1 and 2. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present embodiment, which is an example of the present disclosure, will be described below. These descriptions and examples are intended to exemplify the embodiment, and are not intended to limit the scope of the embodiment.

[0011] In the numerical ranges described in this embodiment in stages, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in this embodiment, the upper or lower limit value of the numerical range may be replaced with the value shown in the examples. In this embodiment, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended purpose of the process is achieved. When the present embodiment is described with reference to the drawings, the configuration of the embodiment is not limited to the configuration shown in the drawings. Furthermore, the sizes of the components in each drawing are conceptual, and the relative size relationships between the components are not limited to these. In this embodiment, each component may contain multiple types of corresponding substances. When referring to the amount of each component in the composition in this embodiment, if multiple types of substances corresponding to each component are present in the composition, the amount refers to the total amount of the multiple types of substances present in the composition, unless otherwise specified.

[0012] [Stripping liquid composition] The stripper composition according to this embodiment contains an aromatic alcohol, a compatibilizer, water, alkanolamines, and an anionic surfactant, and the aromatic alcohol content A, the compatibilizer content B, and the water content C satisfy the following formulas 1 and 2: Formula 1:X≧0.6 Formula 2: C≦(-1.80×X 2 +1.05×X+0.72)×100 (In Formula 1 and Formula 2, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer.)

[0013] The aromatic alcohol content A, the compatibilizer content B, and the water content C refer to the contents (% by mass) in the stripping liquid composition.

[0014] The remover liquid composition according to this embodiment, having the above-described configuration, can effectively remove a urethane resin layer from the surface of an aluminum substrate while suppressing damage to the surface of the aluminum substrate. The reason for this is presumed to be as follows.

[0015] In a metal-resin composite having a urethane resin layer in contact with the surface of an aluminum substrate, it is not easy to peel the cross-linked urethane resin layer from the substrate. Although a method of peeling by applying a strong physical force is conceivable, it has been difficult to satisfactorily peel the urethane resin layer while suppressing damage to the surface of the aluminum substrate.

[0016] In contrast, the stripping liquid composition according to this embodiment has the above-described configuration. Among the components contained in the stripping solution composition, alkanolamines attack bonds in the urethane resin and contribute to breaking the bonds. Furthermore, aromatic alcohols prevent broken bonds in the urethane resin from re-bonding while penetrating into the urethane resin to swell the urethane resin, thereby contributing to the stripping of the urethane resin layer from the aluminum substrate. Furthermore, anionic surfactants adsorb to the surface of the aluminum substrate to protect the surface and contribute to preventing scratches on the substrate surface. The presence of water allows the anionic surfactant to function effectively and adsorb to the surface of the aluminum substrate. Furthermore, the presence of a compatibilizer allows the aromatic alcohols to be well-compatible with water, thereby effectively achieving the above-mentioned effects. Furthermore, when the ratio (A / (A+B)) of the content A of the aromatic alcohols to the content B of the compatibilizer satisfies formula 1 (i.e., is 0.6 or more), a sufficient amount of aromatic alcohols is contained, and the above-mentioned effects of the aromatic alcohols are effectively exhibited. Furthermore, satisfying formula 2, which is the relationship between the ratio (A / (A+B)) of the aromatic alcohol content A to the compatibilizer content B, and the water content C, is an indicator that each component in the stripper liquid composition is dissolved. If formula 2 is not satisfied, each component exists separately in the stripper liquid composition, and the above-mentioned effects of each component are not exhibited well. When the stripper liquid composition satisfies formula 2, each component exists in a dissolved state in the stripper liquid composition, and the above-mentioned effects of each component are exhibited well.

[0017] As described above, the remover liquid composition according to this embodiment can effectively remove a urethane resin layer in contact with the surface of an aluminum substrate while suppressing damage to the surface of the aluminum substrate when the urethane resin layer is removed.

[0018] Aromatic alcohols Examples of aromatic alcohols include benzyl alcohol, 2-phenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, 2,3-dimethoxybenzyl alcohol, 1-naphthalenemethanol, furfuryl alcohol, 2-pyridinemethanol, and 4-pyridinemethanol.

[0019] From the viewpoint of effectively removing the urethane resin layer, the remover composition preferably contains at least one aromatic alcohol selected from the group consisting of benzyl alcohol, 2-phenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, and 2,3-dimethoxybenzyl alcohol.More preferably, the remover composition contains benzyl alcohol as the aromatic alcohol.

[0020] [ka]

[0021] From the viewpoint of effectively removing the urethane resin layer, the content of aromatic alcohols in the stripping liquid composition is preferably 30% by mass or more and 65% by mass or less, and more preferably 35% by mass or more and 60% by mass or less.

[0022] Compatibilizer The compatibilizer has good compatibility with aromatic alcohols and water and is used as a material for dissolving aromatic alcohols, which have low solubility in water, in water. Examples of the compatibilizer include sodium benzenesulfonates, sodium aromatic carboxylates, and glycol ethers. Examples of the sodium aromatic carboxylates include sodium benzoate and sodium salicylate. Examples of glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, and diethylene glycol dimethyl ether.

[0023] As the compatibilizer, sodium benzenesulfonates are preferred from the viewpoint of good peeling of the urethane resin layer. From the viewpoint of effectively removing the urethane resin layer, the stripper composition preferably contains, as the sodium benzenesulfonate, at least one selected from the group consisting of sodium 2,4-dimethylbenzenesulfonate, sodium 3,5-dimethylbenzenesulfonate, sodium 4-dodecylbenzenesulfonate, sodium cumenesulfonate, and sodium o-formylbenzenesulfonate.Moreover, the stripper composition more preferably contains, as the sodium benzenesulfonate, sodium 2,4-dimethylbenzenesulfonate.

[0024] [ka]

[0025] From the viewpoint of effectively removing the urethane resin layer, the content of the compatible solvent in the remover composition is preferably 10% by mass or more and 35% by mass or less, and more preferably 12% by mass or more and 30% by mass or less.

[0026] ·water From the viewpoint of suppressing scratches on the surface of the aluminum substrate, the water content in the stripper composition is preferably 10% by mass or more and 40% by mass or less, more preferably 15% by mass or more and 35% by mass or less, and even more preferably 20% by mass or more and 30% by mass or less.

[0027] Alkanolamines Examples of alkanolamines include ethanolamine, diethanolamine, triethanolamine, isopropanolamine, triisopropanolamine, aminoethylethanolamine, 2-amino-2-methyl-1-propanol, diglycolamine, n-methyl-2-pyrrolidone, N-methylethanolamine, N-methyldiethanolamine, and polyetheramine.

[0028] From the viewpoint of effectively removing the urethane resin layer, the stripper composition preferably contains, as an alkanolamine, at least one selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, isopropanolamine, triisopropanolamine, aminoethylethanolamine, 2-amino-2-methyl-1-propanol, diglycolamine, and n-methyl-2-pyrrolidone.More preferably, the stripper composition contains, as an alkanolamine, at least one selected from the group consisting of diethanolamine and isopropanolamine.

[0029] [ka]

[0030] From the viewpoint of effectively removing the urethane resin layer, the content of alkanolamines in the stripper composition is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1% by mass or more and 5% by mass or less, and even more preferably 2% by mass or more and 4% by mass or less.

[0031] Anionic surfactants Examples of anionic surfactants include succinic acid type anionic surfactants and phosphate ester type anionic surfactants.

[0032] The anionic surfactant preferably includes a succinic acid type anionic surfactant and a phosphate ester type anionic surfactant. The inclusion of both anionic surfactants inhibits white pitting corrosion and black discoloration on the surface of the aluminum substrate. White pitting corrosion is a phenomenon in which holes form on the surface of the aluminum substrate, causing the surface to turn white, and is also known as white rust. Black discoloration is a phenomenon in which the surface of the aluminum substrate turns black and loses gloss, and is also known as black burn. It is believed that white pitting corrosion is suppressed by protecting the surface from alkaline aqueous solutions through the adsorption of surfactants on the surface of the aluminum substrate, while blackening is suppressed because corrosion progresses uniformly across the surface of the aluminum substrate due to the alkaline environment and the influence of bipolar groups.

[0033] [ka]

[0034] The content of the anionic surfactant in the stripper composition is preferably 1% by mass or more and 10% by mass or less, and more preferably 3% by mass or more and 9% by mass or less, from the viewpoint of preventing scratches on the surface of the aluminum substrate. When both a succinic acid type anionic surfactant and a phosphate ester type anionic surfactant are contained, the content of the succinic acid type anionic surfactant is preferably 1% by mass or more and 10% by mass or less, and more preferably 3% by mass or more and 7% by mass or less, and the content of the phosphate ester type anionic surfactant is preferably 0.2% by mass or more and 2% by mass or less, and more preferably 0.5% by mass or more and 1.5% by mass or less.

[0035] Aromatic alcohol content A, compatible solvent content B The ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer and the content B of the aromatic alcohol satisfies the following formula 1. Formula 1:X≧0.6 (In formula 1, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer.)

[0036] From the viewpoint of good peeling of the urethane resin layer, the ratio (A / (A+B)) is preferably 0.6 or more and 0.8 or less, and more preferably 0.7 or more and 0.8 or less.

[0037] [Method of manufacturing recycled aluminum substrate] The stripper composition according to an embodiment of the present disclosure is used in a method for producing a recycled aluminum substrate. That is, a metal resin composite having an aluminum base material and a urethane resin layer in contact with the surface of the aluminum base material can be immersed in the stripping solution composition according to an embodiment of the present disclosure to strip the urethane resin layer from the aluminum base material, thereby obtaining a recycled aluminum base material. During the immersion, ultrasonic waves may be irradiated in the stripping composition.

[0038] An example of a metal resin composite having an aluminum base material and a urethane resin layer in contact with the surface of the aluminum base material is a photoreceptor used in an electrophotographic image forming apparatus.

[0039] Although the present embodiment has been described above, it should not be construed as being limited to the above embodiment, and various modifications, changes, and improvements are possible. [Example]

[0040] Examples of the present disclosure will be described below, but the present disclosure is not limited to the following examples. In the following description, unless otherwise specified, all "parts" and "%" are by mass.

[0041] Examples and Comparative Examples -Preparation of Stripping Solution Composition- The types of components shown in Tables 1 to 4 were prepared as aromatic alcohols, compatibilizers, alkanolamines, water, and anionic surfactants, and mixed in the amounts shown in Tables 1 to 4 to prepare the stripper liquid compositions of each Example and Comparative Example. For the obtained stripping solution composition, X (i.e., the ratio (A / (A+B))) shown in Equation 1 and (-1.80×X 2 +1.05×X+0.72)×100 calculation results are shown in Tables 1 to 4.

[0042] Each component listed in Tables 1 to 4 (Aromatic alcohols) Benzyl alcohol 2-Pyridinemethanol (Compatibilizer) Sodium 2,4-dimethylbenzenesulfonate Ethylene glycol diethyl ether Sodium 3,5-dimethylbenzenesulfonate (Alkanolamines) Diethanolamine Isopropanolamine Polyetheramine (surfactant) Succinic acid type anionic surfactant (Sunhibitor OMA-10, manufactured by Sanyo Chemical Industries, Ltd.) Phosphate ester type anionic surfactant (Chemistat 3500, manufactured by Sanyo Chemical Industries, Ltd.) Fatty acid ester (Ionet DO-1000, manufactured by Sanyo Chemical Industries, Ltd.)

[0043] [Evaluation test] (mixability) The mixed stripping liquid composition was evaluated according to the following criteria. A◎: The stripping solution composition did not separate (transparent) B○: The stripping solution composition did not separate (cloudy white) C△: The stripping composition remains cloudy for a certain period of time after shaking. Dx: The liquid immediately separates even when the stripping composition is shaken.

[0044] (peelability) A test piece (metal-resin composite) having a urethane resin layer in contact with the surface of an aluminum substrate was immersed in the stripping liquid composition of each Example and Comparative Example, and ultrasonic waves were irradiated in the stripping liquid composition. The conditions for ultrasonic irradiation were a liquid temperature of 70°C, a frequency of 45 kHz, and an irradiation time (immersion time) of 60 minutes, and a peel test was performed. The test piece after the peel test was evaluated according to the following criteria. A◎: 100% of the urethane resin layer peeled off B○: 90% or more but less than 100% of the urethane resin layer is peeled off C△: 70% to less than 90% of the urethane resin layer is peeled off D×: Less than 70% of the urethane resin layer peeled off

[0045] (Metal surface: white pitting corrosion) After the peelability test, the number of white dots (white pitting) per area on the surface of the aluminum substrate was visually confirmed and evaluated according to the following criteria. A◎:5 pieces / mm 2 below B○: 5 pieces / mm 2 Super 10 pieces / mm 2 below C△:10 pieces / mm 2 Super 20 pieces / mm 2 below D×:20 pieces / mm 2 super - : The film did not peel off and could not be evaluated

[0046] (Metal surface: blackening) After the (removability) test, the glossiness of the surface of the aluminum substrate was measured with a spectrophotometer and evaluated according to the following criteria, with the brightness of an unused aluminum substrate being set at 100%. A◎: 95% or more B○: 90% or more but less than 95% C△: 80% or more but less than 90% D×: Less than 80% - : The film did not peel off and could not be evaluated

[0047] (flash point) The flash point of the stripping liquid composition was measured according to JIS K2265-1:2007 (tag closed type) and JIS K2265-4:2007 (Cleveland open type), and evaluated according to the following criteria. A◎: No flash point in the tag closed-type test B○: Flash point of 80°C or higher in the tag closed-cup test, no flash point in the Cleveland open-cup test C△: Flash point of 80°C or higher in the Tag closed cup test, and 60°C or higher in the Cleveland open cup test D×: Flash point less than 80℃ in tag closed-cup test

[0048] [Table 1]

[0049] [Table 2]

[0050] [Table 3]

[0051] [Table 4]

[0052] The present embodiment includes the following aspects. (((1))) The composition comprises an aromatic alcohol, a compatibilizer, water, an alkanolamine, and an anionic surfactant, The stripping liquid composition, wherein the content A of the aromatic alcohol, the content B of the compatibilizer, and the content C of the water satisfy the following formulas 1 and 2: Formula 1:X≧0.6 Formula 2: C≦(-1.80×X 2 +1.05×X+0.72)×100 (In Formula 1 and Formula 2, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer.) (((2))) The stripping solution composition according to (((1))), wherein the ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.6 or more and 0.8 or less. (((3))) The stripping solution composition according to (((2))), wherein the ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.7 or more and 0.8 or less. (((4))) The stripping liquid composition according to any one of (((1))) to (((3))), wherein the water content is 15% by mass or more and 35% by mass or less. (((5))) The stripping liquid composition according to (((4))), wherein the water content is 20% by mass or more and 30% by mass or less. (((6))) The stripping liquid composition according to any one of (((1))) to (((5))), wherein the content of the aromatic alcohol is 35% by mass or more and 60% by mass or less. (((7))) The stripping solution composition according to any one of (((1))) to (((6))), wherein the aromatic alcohol is at least one selected from the group consisting of benzyl alcohol, 2-phenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, and 2,3-dimethoxybenzyl alcohol. (((8))) The stripping liquid composition according to (((7))), wherein the aromatic alcohol is benzyl alcohol. (((9))) The stripping liquid composition according to any one of (((1))) to (((8))), wherein the compatibilizer is a sodium benzenesulfonate. (((10))) The stripping liquid composition according to (((9))), wherein the sodium benzenesulfonate is at least one selected from the group consisting of sodium 2,4-dimethylbenzenesulfonate, sodium 3,5-dimethylbenzenesulfonate, sodium 4-dodecylbenzenesulfonate, sodium cumenesulfonate, and sodium o-formylbenzenesulfonate. (((11))) The stripping liquid composition according to (((10))), wherein the sodium benzenesulfonate is sodium 2,4-dimethylbenzenesulfonate. (((12))) The stripping liquid composition according to any one of (((1))) to (((11))), wherein the alkanolamine is at least one selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, isopropanolamine, triisopropanolamine, aminoethylethanolamine, 2-amino-2-methyl-1-propanol, diglycolamine, and n-methyl-2-pyrrolidone. (((13))) The stripping liquid composition according to (((12))), wherein the alkanolamine is at least one selected from the group consisting of diethanolamine and isopropanolamine. (((14))) The stripping liquid composition according to any one of (((1))) to (((13))), comprising, as the anionic surfactant, a succinic acid-based anionic surfactant and a phosphate ester-based anionic surfactant. (((15))) A method for producing a recycled aluminum substrate, comprising immersing a metal-resin composite having an aluminum substrate and a urethane resin layer in contact with a surface of the aluminum substrate in the stripping solution composition described in any one of (((1))) to (((14))) to strip the urethane resin layer from the aluminum substrate, thereby obtaining a recycled aluminum substrate.

[0053] The invention of (((1))) provides a stripper liquid composition that, when stripping a urethane resin layer in contact with the surface of an aluminum substrate, can effectively strip the urethane resin layer while suppressing damage to the surface of the aluminum substrate, compared to a stripper liquid composition that does not contain at least one selected from the group consisting of aromatic alcohols, compatibilizers, water, alkanolamines, and anionic surfactants, and a stripper liquid composition in which the aromatic alcohol content A, the compatibilizer content B, and the water content C do not satisfy at least one of formulas 1 and 2. According to the invention related to (((2))) or (((3))), a stripper liquid composition is provided that can strip a urethane resin layer better than a stripper liquid composition having a ratio (A / (A+B)) of less than 0.6 or more than 0.8. According to the invention related to (((4))) or (((5))), a stripper liquid composition is provided that can suppress surface scratches on aluminum substrates compared to stripper liquid compositions having a water content of less than 15 mass % or more than 35 mass %. According to the invention related to (((6))), a stripper liquid composition is provided that can strip a urethane resin layer more effectively than a stripper liquid composition having an aromatic alcohol content of less than 35 mass % or more than 60 mass %. According to the invention related to (((7))) or (((8))), there is provided a stripper liquid composition that can strip a urethane resin layer more effectively than a stripper liquid composition that contains only 2-pyridinemethanol or 4-pyridinemethanol as an aromatic alcohol. According to the inventions (((9))), (((10))) and (((11))), there is provided a stripper liquid composition that can strip a urethane resin layer better than a stripper liquid composition that contains only ethylene glycol monoethyl ether or ethylene glycol diethyl ether as a compatibilizer. According to the invention related to (((12))) or (((13))), a stripping liquid composition is provided that can strip a urethane resin layer more effectively than a stripping liquid composition containing only polyetheramine as an alkanolamine. According to the invention related to (((14))), there is provided a stripper liquid composition that can suppress surface scratches on aluminum substrates, compared to a stripper liquid composition that contains only one of a succinic acid type anionic surfactant and a phosphate ester type anionic surfactant as the anionic surfactant. The invention related to (((15))) provides a stripper solution composition that does not contain at least one selected from the group consisting of aromatic alcohols, compatibilizers, water, alkanolamines, and anionic surfactants, and a method for producing recycled aluminum substrates that can effectively strip a urethane resin layer while suppressing surface damage to the aluminum substrate, compared to using a stripper solution composition in which the aromatic alcohol content A, the compatibilizer content B, and the water content C do not satisfy at least one of formulas 1 and 2.

Claims

1. The composition comprises an aromatic alcohol, a compatibilizer, water, an alkanolamine, and an anionic surfactant, The stripping liquid composition, wherein the content A of the aromatic alcohol, the content B of the compatibilizer, and the content C of the water satisfy the following formulas 1 and 2: Formula 1: X≧0.6 Formula 2: C ≤ (-1.80 × X ２ +1.05×X+0.72)×100 (In Formula 1 and Formula 2, X represents the ratio (A / (A+B)) of the content A of the aromatic alcohol to the total amount of the content A of the compatibilizer.)

2. 2. The stripping solution composition according to claim 1, wherein a ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.6 or more and 0.8 or less.

3. 3. The stripping solution composition according to claim 2, wherein a ratio (A / (A+B)) of the content A to the total amount of the content A of the aromatic alcohol and the content B of the compatibilizer is 0.7 or more and 0.8 or less.

4. The stripping liquid composition according to claim 1 , wherein the water content is 15% by mass or more and 35% by mass or less.

5. The stripping liquid composition according to claim 4 , wherein the content of the water is 20% by mass or more and 30% by mass or less.

6. The stripping liquid composition according to claim 1 , wherein the content of the aromatic alcohol is 35% by mass or more and 60% by mass or less.

7. 2. The stripping liquid composition according to claim 1, wherein the aromatic alcohol is at least one selected from the group consisting of benzyl alcohol, 2-phenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, and 2,3-dimethoxybenzyl alcohol.

8. The stripping liquid composition according to claim 7, wherein the aromatic alcohol is benzyl alcohol.

9. The stripping liquid composition according to claim 1 , wherein the compatibilizer is a sodium benzenesulfonate.

10. 10. The stripping solution composition according to claim 9, wherein the sodium benzenesulfonate is at least one selected from the group consisting of sodium 2,4-dimethylbenzenesulfonate, sodium 3,5-dimethylbenzenesulfonate, sodium 4-dodecylbenzenesulfonate, sodium cumenesulfonate, and sodium o-formylbenzenesulfonate.

11. 11. The stripping liquid composition according to claim 10, wherein the sodium benzenesulfonate is sodium 2,4-dimethylbenzenesulfonate.

12. 2. The stripping liquid composition according to claim 1, wherein the alkanolamine is at least one selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, isopropanolamine, triisopropanolamine, aminoethylethanolamine, 2-amino-2-methyl-1-propanol, diglycolamine, and n-methyl-2-pyrrolidone.

13. The stripping liquid composition according to claim 12, wherein the alkanolamine is at least one selected from the group consisting of diethanolamine and isopropanolamine.

14. The stripping liquid composition according to claim 1 , comprising, as the anionic surfactant, a succinic acid-based anionic surfactant and a phosphate ester-based anionic surfactant.

15. A method for producing a recycled aluminum substrate, comprising: immersing a metal-resin composite having an aluminum substrate and a urethane resin layer in contact with a surface of the aluminum substrate in the stripping solution composition according to any one of claims 1 to 14, thereby removing the urethane resin layer from the aluminum substrate and obtaining a recycled aluminum substrate.

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