Cleaning agent and method for remanufacturing the same, cleaning method, and cleaning agent kit

Abstract

To provide a cleaning agent, a method for remanufacturing the same, a cleaning method, and a cleaning agent kit. [Solution] Formula (1): RO-CH2-CHX-OH (In the formula, R represents a C1-C4 alkyl group, and X represents a hydrogen atom or a methyl group.) A detergent containing 10% to 50% by mass of two or more alkylene glycol monoalkyl ethers represented by [formula], and having an amine content of less than 0.1% by mass.

Description

[Technical Field]

[0001] This disclosure relates to a cleaning agent, a method for remanufacturing the same, a cleaning method, and a cleaning agent kit. [Background technology]

[0002] When electronic components are joined to the electrodes of a printed circuit board using solder paste or rosin-core solder, flux is inevitably generated, and various cleaning agents are used in this field to remove it.

[0003] While fluorocarbon-based cleaning agents were once the mainstream for flux removal, in recent years, due to concerns about their adverse effects on the environment, non-fluorocarbon cleaning agents such as hydrocarbon-based and glycol-based cleaning agents have been used (Patent Documents 1-3). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 3-152197 [Patent Document 2] Japanese Patent Application Publication No. 5-175641 [Patent Document 3] Japanese Patent Application Publication No. 10-046198 [Overview of the project] [Problems that the invention aims to solve]

[0005] The problem that this invention aims to solve is to provide a cleaning agent that has good drying properties (rinsing properties) and liquid life, and does not leave oily stains after washing. [Means for solving the problem]

[0006] This disclosure provides the following items: (Item 1) Formula (1):RO-CH2-CHX-OH (In the formula, R represents a C1-C4 alkyl group, and X represents a hydrogen atom or a methyl group.) A detergent containing 10% to 50% by mass of two or more alkylene glycol monoalkyl ethers represented by [formula], and having an amine content of less than 0.1% by mass. (Item 2) A cleaning agent as described above, containing 50% to 90% by mass of water. (Item 3) A method for remanufacturing a detergent, comprising the step of distilling a liquid containing the detergent described in any one of the above items to obtain the detergent. (Item 4) A cleaning method comprising the step of bringing a cleaning agent described in any one of the above items into contact with a contaminant. (Item 5) A cleaning agent kit comprising cleaning agent 1 and cleaning agent 2, The cleaning agent 1 is the cleaning agent described in any one of the above items. The aforementioned cleaning agent 2 is a polyalkylene glycol ether represented by the following formula (A), R A1 -O-(CH2-CHR A2 -O) a -R A3 (In the formula, R A1 R represents a C1-6 alkyl group or a benzyl group. A2 R represents a methyl group or a hydrogen atom. A3 (where 'a' represents a C1-5 alkyl group or a hydrogen atom, and 'a' represents an integer between 2 and 4.) The amine represented by the following formula (B) [ka] (In the formula, R B (b) represents a C1-7 alkyl group. (b) represents a C1-5 alkyl group or a hydrogen atom. (b1) represents an integer from 1 to 15. (b2) represents an integer from 0 to 15.) A cleaning agent kit containing an amino group-free chelating agent.

[0007] In this disclosure, one or more of the features described above may be provided in combinations other than those explicitly stated.

Advantages of the Invention

[0008] The cleaning agent of the present invention exhibits good drying property (rinsing property) and liquid life. Further, when cleaning is performed using the cleaning agent of the present invention, stains such as oil droplets do not occur after cleaning.

Modes for Carrying Out the Invention

[0009] Throughout the present disclosure, the ranges of numerical values such as various physical property values and contents can be appropriately set (for example, selected from the values described in each of the following items). Specifically, for the numerical value α, when A3, A2, A1 (assuming A3 > A2 > A1) etc. are mentioned, the range of the numerical value α is A3 or less, A2 or less, less than A3, less than A2, A1 or more, A2 or more, greater than A1, greater than A2, A1 to A2 (A1 or more and A2 or less), A1 to A3, A2 to A3, A1 or more and less than A3, A1 or more and less than A2, A2 or more and less than A3, greater than A1 and less than A3, greater than A1 and less than A2, greater than A2 and less than A3, greater than A1 and A3 or less, greater than A1 and A2 or less, greater than A2 and A3 or less, etc.

[0010] As long as the problems to be solved by the present invention are solved, each component, condition, numerical value, etc. are not particularly limited.

[0011] “αβ amount (A / B)” means the β amount (α) of A with respect to 100α of B. α includes, for example, mass%, mol%, parts by mass, etc. The β amount includes contents, usage amounts, etc. “Mass% content (A / B)” means the content (mass%) of A with respect to 100 mass% of B.

[0012] “γ ratio (A / B)” means the γ ratio calculated by the formula “A÷B”. The γ ratio includes, for example, mass ratio, molar ratio, etc.

[0013] “C···” means “having ··· carbon atoms”. For example, “C1-6 alkyl group” means an alkyl group having 1 to 6 carbon atoms. “C6 alkyl group” means an alkyl group having 6 carbon atoms.

[0014] [Cleaning agent] This disclosure relates to formula (1):RO-CH2-CHX-OH (In the formula, R represents a C1-C4 alkyl group, and X represents a hydrogen atom or a methyl group.) This invention relates to a detergent containing 10% to 50% by mass of two or more alkylene glycol monoalkyl ethers represented by [formula], and having an amine content of less than 0.1% by mass.

[0015] Examples of C1-4 alkyl groups include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, tert-butyl group, etc.

[0016] <Alkylene glycol monoalkyl ether> Alkylene glycol monoalkyl ethers can be used in combination of two or more types.

[0017] Examples of alkylene glycol monoalkyl ethers include ethylene glycol monoalkyl ethers and propylene glycol monoalkyl ethers.

[0018] Examples of ethylene glycol monoalkyl ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-iso-propyl ether, ethylene glycol mono-n-butyl ether, ethylene glycol mono-iso-butyl ether, ethylene glycol mono-sec-butyl ether, and ethylene glycol mono-tert-butyl ether.

[0019] Propylene glycol monoalkyl ethers are, for example, Propylene glycol monomethyl ether ,Examples include propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-iso-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-iso-butyl ether, propylene glycol mono-sec-butyl ether, and propylene glycol mono-tert-butyl ether.

[0020] In one embodiment, preferred combinations of alkylene glycol monoalkyl ethers include ethylene glycol mono-iso-propyl ether and propylene glycol mono-n-butyl ether, propylene glycol monoethyl ether and propylene glycol mono-n-butyl ether, ethylene glycol mono-iso-propyl ether and ethylene glycol mono-iso-butyl ether, ethylene glycol mono-iso-propyl ether and ethylene glycol mono-tert-butyl ether.

[0021] Examples of mass% content (alkylene glycol monoalkyl ether / cleaning agent) include 50% by mass, 47% by mass, 45% by mass, 40% by mass, 39% by mass, 37% by mass, 35% by mass, 34% by mass, 33% by mass, 32% by mass, 31% by mass, 30% by mass, 29% by mass, 27% by mass, 25% by mass, 20% by mass, 15% by mass, 10% by mass, and so on. In one embodiment, the above content is preferably 10% by mass to 50% by mass.

[0022] Examples of mass% content (ethylene glycol monoalkyl ether / cleaning agent) include 50% by mass, 47% by mass, 45% by mass, 40% by mass, 39% by mass, 37% by mass, 35% by mass, 34% by mass, 33% by mass, 32% by mass, 31% by mass, 30% by mass, 29% by mass, 27% by mass, 25% by mass, 20% by mass, 15% by mass, 10% by mass, 5% by mass, and 0% by mass. In one embodiment, the above content is preferably 0% by mass to 50% by mass.

[0023] Examples of mass% content (propylene glycol monoalkyl ether / cleaning agent) include 50% by mass, 47% by mass, 45% by mass, 40% by mass, 39% by mass, 37% by mass, 35% by mass, 34% by mass, 33% by mass, 32% by mass, 31% by mass, 30% by mass, 29% by mass, 27% by mass, 25% by mass, 20% by mass, 15% by mass, 10% by mass, 5% by mass, and 0% by mass. In one embodiment, the above content is preferably 0% by mass to 50% by mass.

[0024] <amine> In one embodiment, the cleaning agent may optionally contain an amine. The amine may be used alone or in combination of two or more.

[0025] Examples of amines include alkylenediamines and N-alkylmorpholines.

[0026] Examples of mass % content (amine / detergent) include less than 0.1% by mass, less than 0.05% by mass, less than 0.01% by mass, and 0% by mass. In one embodiment, the above content is preferably less than 0.1% by mass, more preferably less than 0.05% by mass, and even more preferably 0% by mass.

[0027] <Water> In one embodiment, the cleaning agent may optionally include water. Water may be used alone or in combination of two or more.

[0028] Examples of water include soft water, hard water, ultrapure water, pure water, distilled water, ion-exchanged water, and tap water.

[0029] Examples of mass % content (water / detergent) include 90% by mass, 85% by mass, 80% by mass, 75% by mass, 70% by mass, 69% by mass, 67% by mass, 65% by mass, 60% by mass, 55% by mass, 53% by mass, 51% by mass, and 50% by mass. In one embodiment, the above content is preferably 50% by mass to 90% by mass.

[0030] <Additives> The above-mentioned cleaning agents may optionally contain agents (additives) that do not fall under any of the above categories.

[0031] Examples of additives include surfactants.

[0032] A "surfactant" refers to a substance that forms micelle-like aggregates in a solution at concentrations above the critical micelle level.

[0033] In one embodiment, the mass % content (additive / cleaning agent) is preferably less than 1% by mass, less than 0.1% by mass, less than 0.01% by mass, 0% by mass, etc.

[0034] In one embodiment, the parts by mass content (additive / alkylene glycol monoalkyl ether) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc.

[0035] In one embodiment, the parts by mass content (additive / water) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc.

[0036] A cleaning agent can be manufactured by dispersing and mixing the above agents.

[0037] In one embodiment, the cleaning agent is preferably an azeotropic cleaning agent.

[0038] "Azeotropic cleaning agent" refers to a cleaning agent that contains an azeotropic mixture.

[0039] An "azeotropic mixture" refers to a composition in which the compositional variation remains within a specific range even after repeated cycles of distillation and condensation.

[0040] Examples of the above-mentioned specific ranges include ±15% by mass, ±10% by mass, ±5% by mass, ±3% by mass, ±1% by mass, and 0% by mass. In one embodiment, the above-mentioned specific range is preferably ±15% by mass, more preferably ±5% by mass, and even more preferably 0% by mass.

[0041] In one embodiment, the cleaning agent is preferably a non-azeotropic cleaning agent.

[0042] In one embodiment, the cleaning agent does not have a cloud point. In one embodiment, the cleaning agent has a cloud point.

[0043] Applications (cleaning agents) include, for example, metal mask cleaning agents, flux cleaning agents, and rinsing agents.

[0044] [Method for remanufacturing cleaning agents] This disclosure relates to a method for remanufacturing a detergent, comprising the step of distilling a liquid containing the detergent to obtain the detergent.

[0045] The above-mentioned cleaning agent can be regenerated by distillation, even if the wastewater after cleaning contains flux or other cleaning agents. The regenerated cleaning agent has almost no change in composition ratio or cleaning power compared to the cleaning agent before use. As a result, the cleaning agent can be recycled. Consequently, the amount of cleaning agent wastewater and wastewater can be reduced.

[0046] In one embodiment, the above remanufacturing method may optionally include steps such as vaporizing the waste liquid using a distillation apparatus equipped with a heat source and a condensing mechanism, concentrating the waste liquid, returning the obtained distillate to a receiver or washing machine tank, and removing contaminants concentrated as still residue.

[0047] If the cleaning agent contains substances other than the azeotropic mixture, the process may include adding the substances other than the azeotropic mixture to the obtained azeotropic mixture after the step of obtaining the azeotropic mixture by distillation.

[0048] Examples of distillation methods include simple distillation and multi-stage distillation.

[0049] In one embodiment, the distillation temperature is preferably 90°C to 110°C.

[0050] Examples of mass % content (post-regeneration detergent / pre-regeneration detergent) include 100% by mass, 95% by mass or more, 90% by mass or more, 80% by mass or more, 70% by mass or more, 60% by mass or more, 50% by mass or more, etc. In one embodiment, the above content is preferably 50% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0051] The mass % removal amount (contaminants in the regenerated detergent / contaminants in the detergent before regeneration) can be, for example, 100% by mass, 95% or more by mass, 90% or more by mass, 80% or more by mass, 70% or more by mass, 60% or more by mass, 50% or more by mass, etc. In one embodiment, the above removal amount is preferably 50% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0052] [Washing method] This disclosure relates to a cleaning method, which includes the step of bringing the above-mentioned cleaning agent into contact with a contaminant.

[0053] Examples of cleaning methods include immersion cleaning, shower cleaning, spray cleaning, ultrasonic cleaning, liquid jet cleaning, and direct-pass cleaning (Direct Path®).

[0054] Examples of documents describing cleaning devices include Japanese Patent Publication No. 7-328565, Japanese Patent Publication No. 2000-189912, Japanese Patent Publication No. 2001-000932, and Japanese Patent Publication No. 2005-144441.

[0055] Examples of contaminants include soldering flux, solder paste, flux residue, industrial oil, and metal shavings.

[0056] The mass% removal amount (contaminants after cleaning / contaminants before cleaning) can be, for example, 100% by mass, 95% by mass or more, 90% by mass or more, 80% by mass or more, 70% by mass or more, 60% by mass or more, etc. In one embodiment, the removal amount is preferably 60% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0057] [Detergent Kit] The present disclosure relates to a detergent kit including detergent 1 and detergent 2, where the detergent 1 is the above-mentioned detergent, and the detergent 2 is a polyalkylene glycol ether represented by the following formula (A), R A1 -O-(CH2-CHR A2 -O) a -R A3 (In the formula, R A1 represents a C1-6 alkyl group or a benzyl group. R A2 represents a methyl group or a hydrogen atom. R A3 represents a C1-5 alkyl group or a hydrogen atom. a represents an integer of 2-4.) an amine represented by the following formula (B) [Chemical Formula] (In the formula, R B represents a C1-7 alkyl group. B represents a C1-5 alkyl group or a hydrogen atom. b1 represents an integer of 1-15. b2 represents an integer of 0-15.) and relates to a detergent kit containing an amino group-free chelating agent.

[0058] [Polyalkylene Glycol Ether] The polyalkylene glycol ether can be used alone or in combination of two or more.

[0059] Examples of the polyalkylene glycol ether include polyethylene glycol ether, polypropylene glycol ether, etc.

[0060] Examples of polyethylene glycol ethers include polyethylene glycol monoalkyl ether, polyethylene glycol dialkyl ether, and polyethylene glycol monobenzyl ether.

[0061] Examples of polyethylene glycol monoalkyl ethers include polyethylene glycol monomethyl ether, polyethylene glycol monoethyl ether, polyethylene glycol monopropyl ether, polyethylene glycol monobutyl ether, polyethylene glycol monopentyl ether, and polyethylene glycol monohexyl ether.

[0062] Examples of polyethylene glycol dialkyl ethers include polyethylene glycol dimethyl ether, polyethylene glycol diethyl ether, polyethylene glycol methyl ethyl ether, polyethylene glycol dipropyl ether, polyethylene glycol methyl propyl ether, polyethylene glycol ethyl propyl ether, polyethylene glycol dibutyl ether, polyethylene glycol methyl butyl ether, polyethylene glycol ethyl butyl ether, polyethylene glycol propyl butyl ether, polyethylene glycol dipentyl ether, polyethylene glycol methyl pentyl ether, polyethylene glycol ethyl pentyl ether, polyethylene glycol propyl pentyl ether, polyethylene glycol butyl pentyl ether, and the like.

[0063] Examples of polypropylene glycol ethers include polypropylene glycol monoalkyl ethers, polypropylene glycol dialkyl ethers, and polypropylene glycol monobenzyl ethers.

[0064] Examples of polypropylene glycol monoalkyl ethers include polypropylene glycol monomethyl ether, polypropylene glycol monoethyl ether, polypropylene glycol monopropyl ether, polypropylene glycol monobutyl ether, polypropylene glycol monopentyl ether, and polypropylene glycol monohexyl ether.

[0065] Examples of polypropylene glycol dialkyl ethers include polypropylene glycol dimethyl ether, polypropylene glycol diethyl ether, polypropylene glycol methyl ethyl ether, polypropylene glycol dipropyl ether, polypropylene glycol methyl propyl ether, polypropylene glycol ethyl propyl ether, polypropylene glycol dibutyl ether, polypropylene glycol methyl butyl ether, polypropylene glycol ethyl butyl ether, polypropylene glycol propyl butyl ether, polypropylene glycol dipentyl ether, polypropylene glycol methyl pentyl ether, polypropylene glycol ethyl pentyl ether, polypropylene glycol propyl pentyl ether, and polypropylene glycol butyl pentyl ether.

[0066] Examples of mass% content (polyalkylene glycol ether / cleaning agent 2) include 99% by mass, 95% by mass, 90% by mass, 85% by mass, 80% by mass, 75% by mass, 70% by mass, and 65% by mass. In one embodiment, the above content is preferably 65% ​​by mass to 99% by mass.

[0067] <amine> Amines can be used alone or in combination of two or more types.

[0068] Examples of amines include N-alkyldialkanolamines and primary aliphatic amines.

[0069] Examples of N-alkyldialkanolamines include N-methyldiethanolamine, N-ethyldiethanolamine, N-butyldiethanolamine, and N-propyldiethanolamine.

[0070] Examples of primary aliphatic amines include octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, and 2-ethylhexylamine.

[0071] Examples of mass % content (amine / detergent 2) include 30% by mass, 25% by mass, 20% by mass, 15% by mass, 10% by mass, 5% by mass, 1% by mass, 0.1% by mass, 0.01% by mass, etc. In one embodiment, the above content is preferably 0.01% by mass to 30% by mass.

[0072] <Amino group-free chelating agent> Amino group-free chelating agents can be used alone or in combination of two or more types.

[0073] Examples of amino group-free chelating agents include aliphatic hydroxycarboxylic acid chelating agents and (poly)phosphate chelating agents.

[0074] Examples of aliphatic hydroxycarboxylic acid chelating agents include hydroxycarboxylic acids (salts), etc.

[0075] Examples of the hydroxycarboxylic acids mentioned above include citric acid, isocitric acid, malic acid, and tartaric acid.

[0076] Examples of salts include sodium salts, potassium salts, ammonium salts, alkanolamine salts, and so on.

[0077] Examples of (poly)phosphate chelating agents include orthophosphate, pyrophosphate, triphosphate, and the like.

[0078] Examples of mass% content (amino group-free chelating agent / cleaning agent 2) include 10% by mass, 9% by mass, 7% by mass, 5% by mass, 3% by mass, 1% by mass, 0.1% by mass, 0.01% by mass, etc. In one embodiment, the above content is preferably 0.01% by mass to 10% by mass.

[0079] In one embodiment, the cleaning agent 2 may optionally contain water.

[0080] Examples of mass % content (water / cleaning agent 2) include 10% by mass, 9% by mass, 7% by mass, 5% by mass, 3% by mass, 1% by mass, 0.1% by mass, 0.01% by mass, etc. In one embodiment, the above content is preferably 0.01% by mass to 10% by mass.

[0081] <Additive 2> The above-mentioned cleaning agent 2 may optionally include an agent (additive 2) that does not fall under any of the above categories.

[0082] Additive 2 may include, for example, a surfactant.

[0083] In one embodiment, the mass % content (additive 2 / cleaning agent 2) is preferably less than 1% by mass, less than 0.1% by mass, less than 0.01% by mass, 0% by mass, etc.

[0084] In one embodiment, the parts by mass content (additive 2 / polyalkylene glycol monoalkyl ether) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc.

[0085] In one embodiment, the parts by mass content (additive 2 / amine) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc.

[0086] In one embodiment, the parts by mass content (additive 2 / amino group-free chelating agent) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc.

[0087] In one embodiment, the parts by mass content (additive 2 / water) is preferably less than 1 part by mass, less than 0.1 parts by mass, less than 0.01 parts by mass, 0 parts by mass, etc. [Examples]

[0088] The present invention will be specifically described below through examples and comparative examples. However, the above description and the following examples are not intended to limit the present invention. The present invention is limited only to the claims. Unless otherwise specified below, numerical values ​​such as parts and percentages are based on mass.

[0089] Example 1 A mixed solution was prepared by adding 20 g of ethylene glycol mono-iso-propyl ether, 10 g of propylene glycol mono-n-butyl ether, and 70 g of deionized water to a 200 mL three-necked flask and shaking well. Next, a distillation column corresponding to the theoretical plate number N=10, a T-tube, a thermometer, and a Liebig condenser were connected to the three-necked flask. Furthermore, under atmospheric pressure, the three-necked flask was heated in an oil bath, and the mixed solution was brought to a boil, allowing only the fraction with a boiling point below 100°C to be collected. The content of each component in the fraction was then quantified using a gas chromatography 6850 Network GC System (Agilent Technologies) according to the absolute calibration curve method.

[0090] Unless otherwise specified, other examples were carried out in the same manner as above, except for the modifications shown in the table below.

[0091] [Table 1]

[0092] Drying (rinsing) Approximately 1g of the cleaning agent was measured and placed in a pre-tare ointment can, and then left to stand in a circulating air dryer (ESPEC LC-124) set to 80°C. The ointment can was removed from the dryer every 5 minutes and its weight was measured. "Drying time" refers to the time it took for the weight of the solution to become zero. ◎: Drying time less than 15 minutes ○: Drying time 15 minutes or more, less than 20 minutes ×: Drying time 20 minutes or more

[0093] liquid stain 200 μL of cleaning agent was placed in a watch glass and left to stand in a forward-flow dryer (ESPEC LC-124) set to 80°C. After 15 minutes, the watch glass was removed from the dryer and the appearance of the dried stain was observed. ○: No oily stains will appear. ×: Dry stains resembling oil droplets may appear.

[0094] liquid life A 3% solution of rosin (Longis R:KE-604 = 1:1) was dissolved in the cleaning agent, and the turbidity of the solution was observed. Rondis®: Disproportionated rosin (manufactured by Arakawa Chemical Industries, Ltd.) KE-604: Acrylic rosin hydride (manufactured by Arakawa Chemical Industries, Ltd.) ○: No turbidity is observed in the liquid after rosin dissolution. ×: Cloudiness of the liquid is observed after rosin dissolution.

[0095] Example of evaluation: Cleanability of metal masks A lead-free solder paste (VHP-47, manufactured by Arakawa Chemical Industries, Ltd.) was applied to the opening of a metal mask (40 x 45 mm) to produce a test substrate. 100g of cleaning agent was placed in a 100mL beaker and then heated to 30°C. The test substrate was placed in the beaker and irradiated with ultrasound (45kHz x 3 minutes), and then dried with nitrogen blow. After drying, the number of residual solder balls was evaluated at the openings (64 locations) of the metal mask. ◎: Less than 5 locations ○: 5 or more locations, less than 10 locations ×: 10 or more locations

[0096] [Table 2]

Claims

1. Formula (1): R-O-CH ２ -CHX-OH (In the formula, R represents a C1-C4 alkyl group, and X represents a hydrogen atom or a methyl group.) It contains 10% to 50% by mass of two or more alkylene glycol monoalkyl ethers represented by [formula], and has an amine content of less than 0.1% by mass. The alkylene glycol monoalkyl ether is a detergent selected from the group consisting of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-iso-propyl ether, ethylene glycol mono-sec-butyl ether, ethylene glycol mono-tert-butyl ether, propylene glycol monoethyl ether, propylene glycol mono-iso-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-iso-butyl ether, propylene glycol mono-sec-butyl ether, and propylene glycol mono-tert-butyl ether.

2. The cleaning agent according to claim 1, comprising 50% to 90% by mass of water.

3. A method for remanufacturing a detergent, comprising the step of distilling a liquid containing the detergent according to claim 1 or 2 to obtain the detergent.

4. A cleaning method comprising the step of bringing the cleaning agent according to claim 1 or 2 into contact with a contaminant.

5. A cleaning agent kit comprising cleaning agent 1 and cleaning agent 2, The cleaning agent 1 is the cleaning agent according to claim 1 or 2. The cleaning agent 2 is a polyalkylene glycol ether represented by the following formula (A), R Ａ１ -O-(CH ２ -CHR Ａ２ -O) ａ -R Ａ３ (wherein, R Ａ１ represents a C1-6 alkyl group or a benzyl group. R Ａ２ represents a methyl group or a hydrogen atom. R Ａ３ represents a C1-5 alkyl group or a hydrogen atom. (where 'a' represents an integer between 2 and 4.) The amine represented by the following formula (B) 【B】 (In the formula, R Ｂ b1 represents a C1-7 alkyl group. b represents a C1-5 alkyl group or a hydrogen atom. b1 represents an integer from 1 to 15. b2 represents an integer from 0 to 15. A cleaning agent kit containing an amino group-free chelating agent.

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