Resin removal agent and resin removal method

Abstract

Provided are: a cleaning composition that has excellent fast cleaning capabilities, can be quickly removed after cleaning, and has excellent compatibility; a resin removal agent that contains the cleaning composition; and a resin removal method.　The cleaning composition of the present invention contains at least: a component (A), which is a monovalent aromatic alcohol compound; a component (B), which is an alcohol compound having a valence of three or higher; a component (C), which is an inorganic alkali compound; and a component (D), which is an organic acid or a salt thereof. The composition includes 20-40 parts by mass component (B) with respect to 100 parts by mass of the component (A).

Description

Remover for Resin and Method for Removing Resin

[0001] The present invention relates to a remover for resin and a method for removing resin.

[0002] As a cleaning agent, for example, those containing an anionic surfactant as a main base are widely known and are widely used in fields such as liquid detergents and cosmetics. In addition, cleaning agents are also used in industrial applications. For example, they are used for cleaning containers and production line devices for manufacturing various industrial materials such as paints, coatings, molded articles, varnishes, adhesives, and binders. Therefore, cleaning agents are also required to have the ability to quickly clean resins and the like contained in industrial materials.

[0003] Patent Document 1 proposes a cleaning agent for paint peeling, characterized in that 5 to 40 parts by weight of acetone is blended with 100 parts by weight of a paint solvent containing at least one of toluene, xylene, and methanol in an amount of 40% by weight or more. It is said that such a cleaning agent can peel off the paint adhering to a spray gun and a cup after painting with an acrylic urethane paint, an acrylic lacquer paint, etc. in a relatively short time.

[0004] Japanese Unexamined Patent Application Publication No. 2007 - 56171

[0005] However, conventional cleaning agents have room for improvement in the removal performance and cleaning ability for materials such as resins, and are also poor in so-called rinsability, that is, it is difficult to remove the cleaning agent remaining in containers and the like after cleaning. In addition, since cleaning agents contain a plurality of components, in the case of components that are difficult to mix with each other, separation occurs in the cleaning agent (that is, the compatibility is poor), which may reduce the cleaning ability, and furthermore, there is also a problem of reduced handling properties.

[0006] The present invention has been made in view of the above, and an object thereof is to provide a cleaning agent composition that is excellent in cleaning ability in a short time, can be quickly removed after cleaning, and furthermore has excellent compatibility, a remover for resin containing the cleaning agent composition, and a method for removing resin.

[0007] The inventors of this invention conducted extensive research to achieve the above objectives and, as a result, discovered that the above objectives can be achieved by using a specific monovalent aromatic alcohol compound, a trivalent or higher alcohol compound, an inorganic alkali compound, and an organic acid as essential components, thus completing the present invention.

[0008] In other words, the present invention encompasses, for example, the subject matter described in the following sections: Section 1 A detergent composition comprising at least the following components (A), (B), (C), and (D): Component (A): a monovalent aromatic alcohol compound, Component (B): a trivalent or higher alcohol compound, Component (C): an inorganic alkali compound, Component (D): an organic acid or a salt thereof, wherein the amount of component (B) is 20 parts by mass or more and 40 parts by mass or less per 100 parts by mass of component (A). Section 2 Component (A) is the following general formula (1)

[0009]

[0010] Compounds represented by (in formula (1), where n is a number from 1 to 3), and the following general formula (2)

[0011]

[0012] A cleaning agent composition according to claim 1, wherein the cleaning agent composition is at least one aromatic alcohol compound selected from the group consisting of compounds represented by formula (2), where m is a number from 1 to 5. Claim 3 A cleaning agent composition according to claim 1 or 2, wherein the content of component (B) is 20 parts by mass or less per 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D). Claim 4 A cleaning agent composition according to any one of claims 1 to 3, wherein the content of component (A) is 30 parts by mass or more and 80 parts by mass or less per 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D). Claim 5 A cleaning agent composition according to any one of claims 1 to 4, further containing water. Claim 6 A resin remover for removing resins, comprising the cleaning agent composition according to any one of claims 1 to 5. Claim 7 A resin remover according to claim 6, wherein the resin is at least one selected from the group consisting of urethane resins and epoxy resins. Item 8 A method for removing a resin, comprising removing the resin using the resin remover described in Item 6. Item 9 The method for removing a resin according to Item 8, wherein the resin is at least one selected from the group consisting of urethane resins and epoxy resins.

[0013] The cleaning agent composition of the present invention exhibits excellent cleaning ability in a short time, can be quickly removed after cleaning, and also has excellent compatibility.

[0014] Embodiments of the present invention will be described in detail below. In this specification, the expressions "containing" and "including" include the concepts of "containing," "including," "substantially consisting of," and "consisting only of."

[0015] The cleaning agent composition of the present invention is for removing resins and contains at least the following components (A), (B), (C), and (D): (A) a monovalent aromatic alcohol compound, (B) a trivalent or higher alcohol compound, (C) an inorganic alkali compound, and (D) an organic acid or its salt. The cleaning agent composition of the present invention contains 20 to 40 parts by mass of component (B) per 100 parts by mass of component (A).

[0016] The detergent composition of the present invention contains at least the above-mentioned components (A), (B), (C), and (D), and therefore exhibits excellent cleaning ability in a short time, can be quickly removed after cleaning (i.e., has excellent rinsing properties), and also has excellent compatibility.

[0017] Furthermore, even after being used once for cleaning resins and the like, the cleaning agent composition of the present invention can be repeatedly used as a cleaning agent and is reusable. In addition, the cleaning agent composition of the present invention does not foam easily, so it has excellent handling properties and can be used for cleaning treatment in a simple manner. Therefore, the cleaning agent composition of the present invention is suitable as a raw material for cleaning agents.

[0018] The term "excellent compatibility" of the detergent composition of the present invention can mean, for example, that no separation (e.g., phase separation or precipitate formation) occurs when the appearance of the detergent composition is observed.

[0019] The following describes each component included in the detergent composition of the present invention.

[0020] <Component (A)> Component (A) is a monohydric aromatic alcohol compound. Therefore, component (A) is an aromatic compound having one hydroxyl group. If the cleaning agent composition of the present invention does not contain component (A), its cleaning ability on resins and the like will be significantly reduced.

[0021] (A) The type of component is not particularly limited as long as it is an aromatic compound having one hydroxyl group, and for example, a wide range of known monohydric aromatic alcohol compounds can be mentioned.

[0022] In particular, component (A) is preferably at least one aromatic alcohol compound selected from the group consisting of compounds represented by the following general formula (1) and compounds represented by the following general formula (2).

[0023]

[0024]

[0025] In equation (1) above, n is a number between 1 and 3.

[0026] In formula (2) above, m is a number from 1 to 5.

[0027] (A) When component (A) is an aromatic alcohol compound represented by formula (1) above, the cleaning agent composition of the present invention exhibits particularly improved cleaning performance on resins and the like, and its cleaning performance on resins and the like is less likely to be impaired even when used repeatedly as a cleaning agent.

[0028] Specific examples of aromatic alcohol compounds represented by formula (1) include phenoxyethanol (n=1 in formula (1)), diethylene glycol monophenyl ether (n=2 in formula (1)), and triethylene glycol monophenyl ether (n=3 in formula (1)).

[0029] In particular, phenoxyethanol is preferred as the aromatic alcohol compound represented by formula (1). In this case, the cleaning agent composition of the present invention exhibits excellent cleaning performance on resins and the like, high rinsing properties and compatibility, and its cleaning performance on resins and the like is less likely to deteriorate even when used repeatedly as a cleaning agent (excellent reusability).

[0030] (A) When component (2) is an aromatic alcohol compound represented by formula (2), the cleaning agent composition of the present invention exhibits particularly improved cleaning performance on resins and the like, and its cleaning performance on resins and the like is less likely to be impaired even when used repeatedly as a cleaning agent.

[0031] In particular, the aromatic alcohol compound represented by formula (2) is preferably 4-phenoxy-1-butanol (where m=4 in formula (2)). In this case, the cleaning agent composition of the present invention exhibits excellent cleaning performance on resins and the like, high rinsing properties and compatibility, and also excellent reusability.

[0032] (A) Component is more preferably at least one selected from the group consisting of phenoxyethanol and 4-phenoxy-1-butanol, and is particularly preferably phenoxyethanol.

[0033] The detergent composition of the present invention may contain only one component (A), or it may contain two or more components.

[0034] (A) The component can be manufactured by known methods or obtained from commercially available products, etc.

[0035] <Component (B)> Component (B) is a trivalent or higher alcohol compound. That is, component (B) is a compound having three or more hydroxyl groups. If the cleaning agent composition of the present invention does not contain component (B), the cleaning ability on resins and the like will be significantly reduced, and one or more of the following will be significantly reduced: rinseability, compatibility, and reusability.

[0036] (B) The type of component is not particularly limited as long as it is an aromatic compound having three or more hydroxyl groups, and for example, a wide range of known trivalent or higher alcohol compounds can be mentioned.

[0037] Examples of trivalent or higher alcohol compounds as component (B) include glycerin, pentaerythritol, dipentaerythritol, tripentaerythritol, trimethylolpropane, trimethylolethane, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,6-hexanetriol, sorbitol, and 1,3,5-tris(hydroxymethyl)benzene.

[0038] In particular, the trivalent or higher alcohol compound is preferably at least one selected from the group consisting of glycerin and pentaerythritol. In this case, the detergent composition of the present invention exhibits particularly excellent cleaning performance on resins and the like, and its rinsing properties, compatibility, and reusability are particularly enhanced, and in addition, foaming when used as a detergent is significantly suppressed.

[0039] <Component (C)> Component (C) is an inorganic alkali compound. An inorganic alkali compound is an inorganic compound that exhibits alkalinity. If the cleaning agent composition of the present invention does not contain component (A), its cleaning ability on resins and the like will be significantly reduced, and it will also become difficult to reuse.

[0040] Inorganic alkali compounds can be broadly defined as inorganic compounds that exhibit alkalinity. Examples of inorganic alkali compounds include various hydroxides, as well as metal salts of phosphoric acid and metal salts of silicate.

[0041] When the inorganic alkali compound is the hydroxide, examples of such hydroxides include sodium hydroxide, potassium hydroxide, and the like. When the inorganic alkali compound is the metal salt of phosphoric acid, examples of such metal salts of phosphoric acid include sodium phosphate, potassium phosphate, and the like. When the inorganic alkali compound is the metal salt of silicic acid, examples of such metal salts of silicic acid include sodium silicate, potassium silicate, and the like.

[0042] Among them, the inorganic alkali compound is preferably a hydroxide, and more preferably at least one selected from the group consisting of sodium hydroxide and potassium hydroxide. In this case, the detergent composition of the present invention is easily and uniformly miscible, and moreover, has excellent cleaning performance against resins and the like, and also, the cleaning performance against resins and the like is hardly impaired even when used as a repeated detergent.

[0043] The component (C) contained in the detergent composition of the present invention can be only one kind, or can be two or more kinds.

[0044] The component (C) can be produced by a known method, or can be obtained from commercially available products or the like.

[0045] <Component (D)> The component (D) is an organic acid or a salt thereof. By the detergent composition of the present invention containing the component (D), each component is easily and uniformly miscible (excellent in compatibility), has excellent cleaning performance against resins and the like, and moreover, has excellent rinsing properties, and the cleaning performance against resins and the like is hardly impaired even when used as a repeated detergent.

[0046] Examples of the organic acid can widely include organic compounds showing acidity. Examples of the organic acid include sulfonic acid compounds and carboxylic acid compounds.

[0047] Preferred sulfonic acid compounds include aromatic sulfonic acid compounds, such as p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, dodecylbenzenesulfonic acid, benzenesulfonic acid, methylnaphthalenesulfonic acid, butylnaphthalenesulfonic acid, naphthalenedisulfonic acid, and naphthalenetrisulfonic acid. Other sulfonic acid compounds include methanesulfonic acid, trifluoromethanesulfonic acid, and camphorsulfonic acid.

[0048] Examples of carboxylic acid compounds include aromatic carboxylic acid compounds such as phthalic acid, isophthalic acid, benzoic acid, and terephthalic acid, as well as acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, hexanoic acid, lactic acid, citric acid, malic acid, chlorogenic acid, and succinic acid.

[0049] The organic acid is preferably at least one selected from the group consisting of aromatic sulfonic acid compounds and aromatic carboxylic acid compounds, more preferably an aromatic sulfonic acid compound, and even more preferably one or more selected from the group consisting of p-toluenesulfonic acid and xylenesulfonic acid. In this case, the cleaning agent composition of the present invention has excellent compatibility, the cleaning performance on resins and the like is excellent, and moreover, it has excellent rinsing properties, and the cleaning performance on resins and the like is not easily impaired even when used repeatedly as a cleaning agent.

[0050] Component (D) may be a salt of the organic acid. If component (D) is an organic acid salt, the type of salt is not particularly limited, for example, alkali metals, and preferred organic acid salts are sodium or potassium salts of organic acids. Even if an organic acid other than a salt is incorporated into the detergent composition as component (D), the detergent composition contains the aforementioned component (C), i.e., an inorganic alkali compound, so it may exist in the form of an organic acid salt.

[0051] The resin remover of the present invention may contain only one component (D), or it may contain two or more components.

[0052] (D) Component can be manufactured by known methods or obtained from commercially available products, etc.

[0053] <Detergent Composition> The detergent composition of the present invention contains 20 parts by mass or more and 40 parts by mass or less of component (B) per 100 parts by mass of component (A). If the content of component (B) is less than 20 parts by mass per 100 parts by mass of component (A), the compatibility of the detergent composition of the present invention decreases, and the rinsing properties also decrease. If the content of component (B) exceeds 40 parts by mass per 100 parts by mass of component (A), the compatibility of the detergent composition of the present invention decreases, and repeated use as a detergent makes it easier for the cleaning performance on resins and the like to be impaired.

[0054] The content of component (B) is preferably 21 parts by mass or more, more preferably 22 parts by mass or more, even more preferably 23 parts by mass or more, preferably 35 parts by mass or less, more preferably 33 parts by mass or less, even more preferably 32 parts by mass or less, and particularly preferably 30 parts by mass or less.

[0055] Furthermore, in the detergent composition of the present invention, it is preferable that the content of component (B) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is 20 parts by mass or less. In this case, the compatibility of the detergent composition of the present invention is easily increased, and the cleaning performance on resins, etc., is not easily impaired even when used repeatedly as a detergent. It is more preferable that the content of component (B) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is 18 parts by mass or less, even more preferable that it is 17 parts by mass or less, particularly preferable that it is 16 parts by mass or less, and preferably 10 parts by mass or more.

[0056] In the detergent composition of the present invention, the content of component (A) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is preferably 30 parts by mass or more and 80 parts by mass or less. In this case, the detergent composition of the present invention has excellent cleaning performance on resins and the like, and its rinsability and compatibility are also easily improved. The content of component (A) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is more preferably 40 parts by mass or more, even more preferably 45 parts by mass or more, particularly preferably 50 parts by mass or more, more preferably 70 parts by mass or less, even more preferably 60 parts by mass or less, and particularly preferably 55 parts by mass or less.

[0057] In the detergent composition of the present invention, the content of component (C) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is preferably 1 part by mass or more, more preferably 3 parts by mass or more, even more preferably 5 parts by mass or more, particularly preferably 8 parts by mass or more, and also preferably 20 parts by mass or less, more preferably 18 parts by mass or less, and even more preferably 16 parts by mass or less.

[0058] In the detergent composition of the present invention, the content of component (D) relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D) is preferably 10 parts by mass or more, more preferably 12 parts by mass or more, even more preferably 15 parts by mass or more, particularly preferably 16 parts by mass or more, and also preferably 40 parts by mass or less, more preferably 35 parts by mass or less, even more preferably 30 parts by mass or less, and particularly preferably 25 parts by mass or less.

[0059] The detergent composition of the present invention may contain other components in addition to the components (A), (B), (C), and (D) described above. For example, the detergent composition of the present invention may further contain water. The water can be used to dilute each component contained in the detergent composition, thereby enabling more efficient cleaning with the detergent composition of the present invention.

[0060] The type of water is not particularly limited, and various types of water can be used, such as pure water, distilled water, tap water, industrial water, ion-exchanged water, deionized water, and electrolyzed water. The water may contain pH adjusters, viscosity adjusters, antifungal agents, etc., as long as the effects of the present invention are not hindered.

[0061] The amount of water contained in the detergent composition of the present invention is not particularly limited. More preferably, the amount of water contained in the detergent composition is 10 to 1000 parts by mass (i.e., 10 parts by mass or more and 1000 parts by mass or less) per 100 parts by mass of the total mass of components (A), (B), (C), and (D).

[0062] The amount of water is preferably 30 parts by mass or more, more preferably 50 parts by mass or more, even more preferably 60 parts by mass or more, and particularly preferably 80 parts by mass or more, based on 100 parts by mass of the total mass of components (A), (B), (C), and (D). Furthermore, the amount of water is preferably 800 parts by mass or less, more preferably 600 parts by mass or less, even more preferably 500 parts by mass or less, and particularly preferably 300 parts by mass or less, based on 100 parts by mass of the total mass of components (A), (B), (C), and (D).

[0063] The resin remover of the present invention may contain other components in addition to water, and such other components may include, for example, organic solvents other than the above-mentioned components (A) and (B). Examples of such organic solvents include lower aliphatic alcohols having about 1 to 4 carbon atoms, polyhydric alcohols such as glycols, ester solvents such as ethyl acetate, and ketone solvents such as acetone.

[0064] In order to avoid impairing the cleaning performance of the cleaning agent composition on resins and the like, and to ensure that each component mixes uniformly, the content of the organic solvent in the cleaning agent composition of the present invention is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and particularly preferably 1% by mass or less, based on the total mass of component (A), component (B), component (C), and component (D).

[0065] The cleaning agent composition of the present invention may also contain various additives in addition to the organic solvent. Examples of such additives include light stabilizers, antioxidants, preservatives, polymerization inhibitors, fragrances, and fungicides. One or more of these additives may be included in the cleaning agent composition.

[0066] The detergent composition of the present invention may consist only of component (A), component (B), component (C), and component (D), and preferably contains component (A), component (B), component (C), and component (D) and water. The detergent composition of the present invention may consist only of component (A), component (B), component (C), and component (D) and water.

[0067] The cleaning agent composition of the present invention is usually a liquid, and if it is in a solidified state, it can be liquefied by an appropriate method before use. Furthermore, if components (A), (B), (C), and (D) in the cleaning agent composition of the present invention are difficult to mix uniformly, they can be easily made uniform (i.e., made into an aqueous solution) by adding water as a diluent. However, even if the cleaning agent composition of the present invention is cloudy, it can still clean resins and the like. In terms of improved handling, it is preferable that the cleaning agent composition of the present invention is neither phase-separated nor cloudy, and more preferably transparent.

[0068] The method for preparing the detergent composition of the present invention is not particularly limited. For example, the detergent composition of the present invention can be prepared by mixing component (A), component (B), component (C), and component (D) in predetermined proportions. Furthermore, if the detergent composition contains water, the method for mixing the water is not particularly limited. For example, a method of mixing water after combining component (A), component (B), component (C), and component (D) may be employed, or a method of mixing some of the components with water before mixing the remaining components may be employed.

[0069] A cleaning agent can be prepared using the cleaning agent composition of the present invention. Since such a cleaning agent contains the cleaning agent composition of the present invention, it has excellent cleaning performance on resins and the like, high compatibility, excellent rinsing properties after use, and can maintain high cleaning performance even after repeated use. Moreover, since the cleaning agent composition of the present invention contains component (B), it is less likely to foam during use and has excellent handling properties.

[0070] The cleaning agent composition of the present invention exhibits particularly excellent cleaning performance against resins, and is therefore suitable for use as a resin remover. By using such a resin remover, it is possible to remove resins in a short time using a simple method. For example, the resin remover can be suitably used to clean resins adhering to various devices, reaction vessels, reaction lines, molds, etc.

[0071] Since the resin remover contains the cleaning agent composition of the present invention, it exhibits excellent cleaning performance on resins, high compatibility, excellent rinsing properties after use, and can maintain high cleaning performance even after repeated use.

[0072] The above-described resin remover can be suitably used to remove resin adhering to metals and the like. Alternatively, when it is necessary to remove a coating film formed of resin, i.e., a resin layer, the resin remover of the present invention can be used for removal. For example, in a laminate in which adherends such as substrates are bonded together with a resin adhesive, when it is desired to separate the adherends, the adherends can be separated by dissolving the resin adhesive using the resin remover of the present invention, or by peeling the resin adhesive from the adherends.

[0073] In this specification, the term "removing the resin" is not intended to be interpreted in a restrictive manner, but rather means removing the resin by dissolving it, removing the resin by peeling it off, etc., and also includes cases where the removal by dissolving the resin and the removal by peeling the resin occur simultaneously.

[0074] The types of resins that can be removed with the resin remover are not particularly limited; for example, the resin remover can be widely applied to known resins. Examples of resins include epoxy resins, urethane resins, styrene resins, olefin resins, polyester resins, polyamide resins, polylactic acid, and acrylic resins.

[0075] In particular, the resin is preferably at least one selected from the group consisting of urethane resins and epoxy resins, more preferably electrodeposited epoxy resins and electrodeposited urethane resins in that they have particularly high removal efficiency with resin removers, and even more preferably electrodeposited urethane resins. Electrodeposited epoxy resins and electrodeposited urethane resins refer to epoxy resins and urethane resins for electrodeposition coating, respectively, and more specifically, to coating films of epoxy resins and urethane resins formed by electrodeposition coating.

[0076] After removing the target resin with a resin remover, any remaining resin remover can be washed away by means such as water. In particular, since the resin remover contains the cleaning agent composition of the present invention, it can be quickly washed away by water.

[0077] Because the resin remover has the property of being able to dissolve or peel off resin by washing with it, the resin remover of the present invention is used to dissolve resin or to peel off resin.

[0078] The method of using the resin remover is not particularly limited. For example, the resin remover of the present invention can be used as a removal method using the resin remover. For example, in a removal method using the resin remover of the present invention, the resin can be removed by a method that includes a step of removing the resin using the resin remover. For example, this could include a method of bringing the resin remover into contact with the resin to be removed, a method of spraying the resin remover onto the resin to be removed, a method of immersing the resin to be removed in the resin remover, a method of wiping the resin to be removed with paper, cloth, etc., soaked in the resin remover, a method of impregnating the resin to be removed with the resin remover and then removing the resin, and so on.

[0079] In specifying the inventions contained herein, the components (properties, structures, functions, etc.) described in each embodiment of this disclosure may be combined in any way. That is, this disclosure encompasses all subject matter consisting of any combination of the combinatable components described herein.

[0080] The present invention will be described more specifically below with reference to examples, but the present invention is not limited to the embodiments of these examples.

[0081] A detergent composition was prepared by selecting the following components.

[0082] <(A) Component; Monovalent aromatic alcohol compound> Phenoxyethanol, 4-Phenoxy-1-Butanol

[0083] <Aromatic alcohols for comparison> ・Ethylbenzene

[0084] <(B) Components: Trivalent or higher alcohol compounds> - Glycerin - Erythritol

[0085] <Monovalent or divalent alcohols for comparison> ・2-propanol ・ethylene glycol ・diethylene glycol ・propylene glycol

[0086] <(C) Components: Inorganic alkali compounds> • Sodium hydroxide (NaOH) • Potassium hydroxide (KOH)

[0087] <(D) Components: Organic acids or their salts> • Paratoluenesulfonic acid • Xylenesulfonic acid • Phthalic acid

[0088] <Acids for comparison> ・Nitric acid

[0089] <Diluting solvent> ・Water

[0090] (Example 1) A detergent composition was prepared by selecting the raw materials shown in Example 1 of Table 1. Specifically, a detergent composition was obtained by mixing 52.94 parts by mass of phenoxyethanol, 13.24 parts by mass of glycerin, 10.95 parts by mass of sodium hydroxide, 22.87 parts by mass of p-toluenesulfonic acid, and 100 parts by mass of water.

[0091] (Examples 2-9) Detergent compositions were obtained in the same manner as in Example 1, except that the raw materials and amounts used were changed to those shown in Table 1.

[0092] (Examples 10-18) Detergent compositions were obtained in the same manner as in Example 1, except that the raw materials and amounts used were changed to those shown in Table 2.

[0093] (Comparative Examples 1-9) Detergent compositions were obtained in the same manner as in Example 1, except that the raw materials and formulations shown in Table 3 were changed to be used.

[0094] (Evaluation of Cleaning Agent Compositions) The cleaning agent compositions prepared in each example and comparative example were used as resin removers, and their cleaning performance, reusability, compatibility, and rinsing properties were evaluated by the following methods. Cleaning performance was evaluated using two methods: Cleaning Test 1 and Cleaning Test 2.

[0095] (Cleaning Test 1) The cleaning performance of electrodeposited epoxy resin was evaluated using a cleaning agent composition. Specifically, a substrate with an electrodeposited coating film (epoxy resin) from Japan Test Panel Co., Ltd. was immersed in a cleaning agent composition at 25°C, and the condition of the film was visually observed to evaluate the cleaning performance of the cleaning agent composition according to the following judgment criterion 1. <Judgment Criterion 1> A: The film was dissolved or peeled off within 40 minutes of immersion, indicating excellent cleaning performance. B: After more than 40 minutes of immersion, the film was dissolved or peeled off within 80 minutes, indicating excellent cleaning performance. C: After more than 80 minutes of immersion, the film was dissolved or peeled off, indicating good cleaning performance. D: After more than 80 minutes, part of the film was removed, but more than half remained, and when the remaining film was rubbed, some of it peeled off further. E: The film did not dissolve or peel off, and did not peel off even when rubbed, indicating poor cleaning performance.

[0096] (Cleaning Test 2) The cleaning performance of electrodeposited urethane resin was evaluated using a cleaning agent composition. Specifically, using the electrodeposited urethane resin "Superflex 150" (registered trademark) from Daiichi Kogyo Seiyaku Co., Ltd., a urethane resin coating film was cast onto a substrate (Paltec Co., Ltd. "Cold-rolled steel sheet SPCC-SD", 70 x 150 mm) to a dry film thickness of 35 μm. After drying at 80°C for 5 minutes, a further drying treatment was performed at 120°C for 12 hours to obtain a test film. The substrate on which the film was formed was immersed in a cleaning agent composition at 25°C, and the state of the film was visually observed to evaluate the cleaning performance of the cleaning agent composition on the urethane resin according to the following judgment criterion 2. <Judgment Criterion 2> A: The film was dissolved or peeled off within 40 minutes of immersion, indicating excellent cleaning performance. B: After more than 40 minutes of immersion, the film was dissolved or peeled off within 80 minutes, indicating excellent cleaning performance. C: The film dissolved or peeled off completely after more than 80 minutes of immersion, indicating good cleaning performance. D: After more than 80 minutes, some of the film was removed, but more than half remained, and some of the remaining film peeled off further when rubbed. E: The film did not dissolve or peel off, and did not peel off even when rubbed, indicating poor cleaning performance.

[0097] (Reusability) The cleaning agent compositions used in the above-mentioned cleaning tests 1 and 2 were collected and the same tests as in cleaning tests 1 and 2 were performed again, and the reusability of the cleaning agent compositions was evaluated according to the following criteria 3. <Criteria 3> A: Cleaning performance was maintained even after repeated use 10 or more times, indicating excellent reusability. B: Cleaning performance was maintained even after repeated use 9 times, indicating excellent reusability. C: Cleaning performance was maintained even after repeated use, albeit only once, indicating good reusability. D: Repeated use was ineffective in cleaning the resin, making it unusable.

[0098] (Compatibility) The detergent composition was visually observed, and its compatibility was evaluated according to the following criterion 4. <Criterion 4> A: It was a clear liquid and had excellent compatibility. B: Although cloudiness was observed, no separation was seen, and the compatibility was practically acceptable. C: Cloudiness was observed, and separation was also seen, indicating poor compatibility.

[0099] (Rinsing Properties) The substrates that were cleaned in the aforementioned cleaning tests 1 and 2 were rinsed with tap water, and the rinsing properties of the detergent composition were evaluated according to the following criterion 5. <Criterion 5> A: After two rinses with tap water, the remaining percentage of the detergent composition in the residue was less than 1% by mass, indicating excellent rinsing properties. B: After three rinses with tap water, the remaining percentage of the detergent composition in the residue was less than 1% by mass, indicating excellent rinsing properties. C: After four or more but less than six rinses with tap water, the remaining percentage of the detergent composition in the residue was less than 1% by mass, indicating excellent rinsing properties. D: Even after six or more rinses with tap water, the remaining percentage of the detergent composition in the residue was not less than 1% by mass, indicating poor rinsing properties. In the above judgments A to D, the rinsing method with tap water and the method for measuring the remaining percentage of each detergent composition were carried out as follows. First, the detergent composition remaining on the substrates cleaned in cleaning test 1 and cleaning test 2 was weighed without rinsing, and this was defined as X parts by mass (excluding the weight of the substrate). Next, a 3L tray was filled to the brim with tap water, and the substrates cleaned in cleaning test 1 or cleaning test 2 were immersed in the water for 30 seconds at 25°C and left to stand. After that, the substrates were removed and allowed to air dry, and the weight of the detergent composition remaining on the substrates was weighed, this was defined as Y parts by mass (excluding the weight of the substrate), and the remaining percentage was calculated using the following formula: Remaining percentage (%) = (Y / X) × 100.

[0100] Tables 1-3 show the formulation conditions and evaluation results of the detergent compositions prepared in the examples and comparative examples. In the formulation conditions in Tables 1-3, blank spaces indicate that the raw material was not used.

[0101] Tables 1-3 show that resin removers containing at least components (A), (B), (C), and (D) exhibit excellent cleaning (removal) performance for both electrodeposited epoxy resins and electrodeposited urethane resins, and demonstrate excellent rinsing properties and compatibility. Furthermore, the resin removers made from the cleaning agent compositions prepared in the examples can be reused even after being used once for cleaning.

[0102] Although not shown in the table, it was also found that the detergent composition containing component (B) produced less foam and had better handling properties compared to conventional detergent compositions.

[0103]

[0104]

[0105]

Claims

1. A detergent composition comprising the following components (A), (B), (C), and (D): (A) a monovalent aromatic alcohol compound, (B) a trivalent or higher alcohol compound, (C) an inorganic alkali compound, and (D) an organic acid or a salt thereof, wherein the composition contains at least 20 to 40 parts by mass of component (B) per 100 parts by mass of component (A).

2. The above component (A) is given by the following general formula (1) Compounds represented by formula (1), where n is a number from 1 to 3, and the following general formula (2) The detergent composition according to claim 1, comprising at least one aromatic alcohol compound selected from the group consisting of compounds represented by formula (2), where m is a number from 1 to 5.

3. The detergent composition according to claim 1, wherein the content of component (B) is 20 parts by mass or less per 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D).

4. The detergent composition according to claim 1, wherein the content of component (A) is 30 parts by mass or more and 80 parts by mass or less, relative to 100 parts by mass of the total mass of component (A), component (B), component (C), and component (D).

5. The detergent composition according to claim 1, further containing water.

6. A resin remover for removing resin, comprising the cleaning agent composition described in any one of claims 1 to 5.

7. The resin remover according to claim 6, wherein the resin is at least one selected from the group consisting of urethane resins and epoxy resins.

8. A method for removing resin, comprising removing the resin using the resin remover described in claim 6.

9. The method for removing a resin according to claim 8, wherein the resin is at least one selected from the group consisting of urethane resin and epoxy resin.

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