Solvent composition, cleaning agent, and cleaning method

Abstract

To provide a solvent composition which, even when used in wiping cleaning, exhibits excellent drying properties, and excellent cleaning performance against various types of oil.SOLUTION: The present invention relates to a solvent composition comprising (A) a hydrocarbon containing at least one selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane, and (B) a hydrofluoroether, wherein the content of the component (A) is 30 to 80 pts.mass when the total of the components (A) and (B) is 100 pts.mass; a cleaning agent comprising the solvent composition; and a cleaning method using the solvent composition.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a solvent composition, a cleaning agent, and a cleaning method. [Background technology]

[0002] Hydrofluoroolefins, such as cis-1-chloro-3,3,3-trifluoropropene, are used as industrial cleaning agents with excellent degreasing properties. Hydrocarbons also have high degreasing properties, and are widely used in industrial cleaning.

[0003] As a cleaning agent using these components, Patent Document 1 describes a cleaning agent containing (A) a hydrofluoroolefin and (B) a hydrocarbon solvent in which the mass ratio of (A) to (B) is 90:10 to 30:70, and describes immersion cleaning using the cleaning agent.

[0004] Also, a wiping cleaning method is known in which a cleaning agent is applied to the object to be cleaned, and the dirt is wiped off with a rag or mop to remove the dirt (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-38274 [Patent Document 2] Patent Publication No. 2022-56115 Summary of the Invention [Problem to be solved by the invention]

[0006] In the case of immersion cleaning, where the item is immersed in a cleaning tank for a certain period of time, dirt is thoroughly removed, and then the item is moved to the next process, such as painting or processing. For this reason, the cleaning agent used in immersion cleaning must be quick-drying.

[0007] However, in the wiping cleaning method, if the drying speed of the cleaning agent is too high, the cleaning agent evaporates before wiping off, which causes the dirt to remain on the surface of the object to be cleaned, whereas if the drying speed of the cleaning agent is too low, some of the cleaning agent remains on the surface of the object to be cleaned even after wiping off, which causes the object to be unable to proceed to the next step efficiently.

[0008] According to the findings of the present inventors, the cleaning agent containing specific amounts of hydrofluoroolefin and hydrocarbon solvent as described in Patent Document 1 has problems with cleaning performance in wiping cleaning.

[0009] Therefore, an object of the present invention is to provide a solvent composition which has excellent drying properties even when used for wiping and has excellent cleaning properties for various oils.

[0010] The present invention has the following configuration. [1] (A) a hydrocarbon containing at least one selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane; (B) containing a hydrofluoroether, The content of the (A) component is 30 to 80 parts by mass when the total amount of the (A) component and the (B) component is 100 parts by mass. Solvent composition. [2] The solvent composition according to [1], wherein the boiling point of component (A) is in the range of 170 to 190°C. [3] The solvent composition according to [1] or [2], wherein the component (B) is at least one selected from the group consisting of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, and 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane. [4] The solvent composition according to any one of [1] to [3], further comprising at least one selected from the group consisting of (C) a hydrofluoroolefin and (D) propylene glycol monomethyl ether. [5] The solvent composition according to [4], wherein the component (C) is at least one selected from the group consisting of cis-1-chloro-3,3,3-trifluoropropene, Z-1-chloro-2,3,3-trifluoroprop-1-ene, and E-1-chloro-2,3,3-trifluoroprop-1-ene. [6] The solvent composition according to [4] or [5], wherein, when the total amount of the components (A), (B), (C), and (D) is taken as 100 parts by mass, the amount of the component (A) is 30 parts by mass or more and 70 parts by mass or less, the amount of the component (B) is 10 parts by mass or more and less than 70 parts by mass, the amount of the component (C) is 0 parts by mass or more and 20 parts by mass or less, and the amount of the component (D) is 0 parts by mass or more and 40 parts by mass or less, and the amount of at least one of the components (C) and (D) exceeds 0 parts by mass. [7] The solvent composition according to any one of [1] to [6], which is a cleaning agent. [8] A cleaning method using the solvent composition according to any one of [1] to [6], A step of applying the solvent composition to an object to be cleaned; leaving the solvent composition remaining on the surface of the object to be cleaned; physically removing the solvent composition from the surface of the object to be cleaned; and A cleaning method comprising the step of removing the solvent composition remaining on the surface of the object to be cleaned by volatilization after the physical removing step. Effect of the Invention

[0011] The present invention provides a solvent composition that has excellent drying properties even when used for wiping and has excellent cleaning properties for various oils. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (Definition of terms) "(B) hydrofluoroether" may be referred to as "(B)" or "(B) component." The same applies to other components. Regarding numerical ranges, "to" means that both ends of the range are included. That is, "30 to 80 parts by mass" means "30 parts by mass or more and 80 parts by mass or less." Additionally, "or less" means "the same as or less than," and "or more" means "the same as or more than."

[0013] [Solvent composition] The solvent composition comprises: (A) a hydrocarbon containing at least one selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane; The solvent composition contains (B) a hydrofluoroether, and when the total of (A) and (B) is 100 parts by mass, the content of (A) is 30 to 80 parts by mass.

[0014] The inventors have discovered that when the solvent composition contains the (A) component and the (B) component in a specific content ratio, the solvent composition has excellent drying properties and excellent cleaning properties for various oils, even when used for wiping.

[0015] In this specification, "excellent drying properties even when used for wiping" means that the solvent composition has excellent residual properties and drying properties after removal. Wiping (wiping cleaning) is a cleaning method that mainly includes applying a solvent composition to an object to be cleaned and wiping off the solvent composition applied to the object to be cleaned.

[0016] In this specification, "excellent residual property" means that when the solvent composition is applied to the object to be cleaned, the solvent composition remains on the surface of the object to be cleaned for a long time. When the solvent composition has excellent residual property, the solvent composition is prevented from volatilizing, and tends to trap dirt (oil, dust). When the solvent composition has poor residual property, the solvent composition volatilizes before the dirt is removed, causing the object to dry out and the dirt to remain on the surface of the object to be cleaned.

[0017] In this specification, "excellent drying property after removal" means that when the solvent composition applied to the object to be cleaned is wiped off (i.e., dirt is removed), the solvent composition remaining on the object to be cleaned is highly volatile. High drying property after removal of the solvent composition does not leave wiping marks, and the next step can be carried out efficiently. When the drying property after removal of the solvent composition is poor, the solvent composition remains on the surface of the object to be cleaned even after wiping off the solvent composition, and the next step cannot be carried out.

[0018] The solvent composition according to the present invention has excellent residual properties and drying properties after removal. Therefore, since the solvent composition according to the present invention has excellent residual properties, drying before wiping is reduced. This reduces the amount of dirt remaining on the surface of the object to be cleaned. In addition, since the solvent composition according to the present invention has excellent drying properties after removal, even after wiping off the solvent composition, the amount of the solvent composition remaining on the surface of the object to be cleaned is reduced. This allows the process to proceed efficiently to the next step.

[0019] [(A) Hydrocarbon containing at least one member selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane] Component (A) is a hydrocarbon containing at least one member selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane.

[0020] In component (A), the hydrocarbons other than 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane (hereinafter also referred to as "further hydrocarbons") are hydrocarbon-based solvents consisting only of carbon and hydrogen atoms, which may be linear or branched, cyclic or acyclic, and which may have a carbon-carbon double bond.

[0021] Further examples of the hydrocarbon include aliphatic hydrocarbons such as hexane, isohexane, cyclohexane, normal heptane, isoheptane, cycloheptane, normal octane, isooctane, nonane, isononane, decane, methylcyclohexane, ethylcyclohexane, limonene, 2-methyl-2-butene, 2-methyl-1-pentene, 2-methyl-2-pentene, 3-ethyl-2-butene, 2,3-dimethyl-2-butene, 2,4,4-trimethyl-1-pentene, 2,4,4-trimethyl-2-pentene, isododecane, isoparaffins, and naphthenes; and aromatic hydrocarbons such as toluene.

[0022] The additional hydrocarbon is preferably an aliphatic hydrocarbon from the viewpoint of low toxicity, and is preferably at least one compound selected from the group consisting of alkanes having 10 to 13 carbon atoms and isoalkanes having 10 to 13 carbon atoms from the viewpoint of boiling point.

[0023] The boiling point range of the component (A) is preferably from 170 to 190°C, and particularly preferably from 173 to 182°C, from the standpoint of residual properties and drying properties. The component (A) may be one type of component or a combination of two or more types of components.

[0024] [(B) Hydrofluoroether] Component (B) is a hydrofluoroether. A hydrofluoroether (HFE) is a compound that contains carbon atoms, fluorine atoms, hydrogen atoms, and an ether bond (-O-). Examples of component (B) include 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (1,1,2,2-tetrafluoro-1-(2,2,2-trifluoroethoxy)ethane, also known as HFE-347pc-f), methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane, 1,1,1,2,3,3-hexafluoro-4-(1,1,2,3,3,3-hexafluoropropoxy)pentane, 1,1,1,2,3,4,4,4-octafluoro-2-methoxy-3-(trifluoromethyl)butane, methyl perfluoropropyl ether, and 1,1,2,3,3,3-hexafluoropropyl methyl ether.

[0025] Commercially available products of the component (B) include Asahiklin AE-3000 (manufactured by AGC Corporation); Novec (trademark) 7100, Novec (trademark) 7200, and Novec (trademark) 7300 (all manufactured by 3M Japan Ltd.).

[0026] The (B) component is preferably at least one selected from the group consisting of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, and 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane. The component (B) may be one type of component or a combination of two or more types of components.

[0027] <Components other than components (A) and (B)> The solvent composition may contain components other than the (A) and (B) components, as long as the effects of the present invention are not impaired. Examples of such components other than the (A) and (B) components include (C) hydrofluoroolefin, (D) propylene glycol monomethyl ether, (E) further components, and (F) additives. Note that the (E) further components and (F) additives are not the (C) and (D) components.

[0028] <<(C) Hydrofluoroolefin>> (C) The hydrofluoroolefin is a fluoroolefin compound that contains hydrogen atoms, carbon atoms, and fluorine atoms, and may further contain one or more atoms selected from the group consisting of chlorine atoms and bromine atoms. The component (C) includes cis-1-chloro-3,3,3-trifluoropropene ((Z)-1-chloro-3,3,3-trifluoro-1-propene, HCFO-1233zd(Z), HFO-1233zd(Z)), E-1-chloro-2,3,3-trifluoroprop-1-ene, ((E)-1-chloro-2,3,3-trifluoropropene, HCFO-1233yd(E)), (Z)-1-chloro-2,3,3-trifluoropropene ((Z)-1-chloro-2,3,3-trifluoro-1-propene, HCFO-1233yd(Z)), 2-bromo-3,3,3-trifluoro-1-propene, 1,1-dichloro-3,3,3-trifluoropropene ( HCFO-1223za), (Z)-1,2-dichloro-3,3,3-trifluoropropene (HCFO-1223xd(Z)), (E)-1,2-dichloro-3,3,3-trifluoropropene (HCFO-1223xd(E)), 1-chloro-1,3,3-trifluoropropene, (Z)-1-chloro-2,3,3,4,4,5,5-heptafluoro-1-pentene (HCFO-1437dycc(Z)), (E)-1-chloro-2,3,3,4,4,5,5-heptafluoro-1-pentene (HCFO-1437dycc(E)), (Z)-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz(Z)), and the like.

[0029] Commercially available products of component (C) include CELEFIN (registered trademark) 1233Z (manufactured by Central Glass Co., Ltd.) (HCFO-1233zd(Z), HFO-1233zd(Z)), AMOLEA (registered trademark) AS-300 (manufactured by AGC Corporation) (a mixture of (E)-1-chloro-2,3,3-trifluoropropene (HCFO-1233yd(E)), (Z)-1-chloro-2,3,3-trifluoropropene (HCFO-1233yd(Z)) and a stabilizer)).

[0030] The component (C) is preferably cis-1-chloro-3,3,3-trifluoropropene, Z-1-chloro-2,3,3-trifluoroprop-1-ene, or E-1-chloro-2,3,3-trifluoroprop-1-ene. The component (C) may be one type of component or a combination of two or more types of components.

[0031] <<(D) Propylene glycol monomethyl ether>> (D) Propylene glycol monomethyl ether is monopropylene glycol monomethyl ether, also known as 1-methoxy-2-propanol.

[0032] <<(E) Further Ingredients>> (E) Additional components include (e1) nitro compounds, (e2) ethers (excluding (D) components), (e3) esters (excluding (e2) ethers), (e4) alcohols (excluding (e2) ethers), (e5) amide compounds, (e6) chloroolefins, (e7) hydrobromocarbons, (e8) hydrofluorocarbons, and (e9) chlorinated hydrocarbons (excluding (e6) chloroolefins and (C) components).

[0033] <(e1) Nitro compounds> The (e1) nitro compound is not particularly limited as long as it has one or more nitro groups in the molecule. Examples of the (e1) component include nitroalkanes such as nitromethane, nitroethane, 1-nitropropane, and 2-nitropropane.

[0034] <(e2) Ether (excluding component (D))> The (e2) ethers (excluding the (D) component) are ether-based solvents that contain carbon atoms, hydrogen atoms, and ether bonds (-o-) and may be linear or branched, and may be cyclic or acyclic. The (e2) component includes glycols. Specific examples of the component (e2) include dipropyl ether, diisopropyl ether, tetrahydrofuran, methyltetrahydrofuran, 4-methyltetrahydropyran, 1,4-dioxane, 1,3-dioxolane, diethyl ether, diisobutyl ether, dibutyl ether, methyl tertiary butyl ether, methyl cellosolve, ethyl cellosolve, isopropyl cellosolve, 1,2-butylene oxide, epichlorohydrin, propylene oxide, cyclohexene oxide, cyclopentene oxide, pentene oxide, heptene oxide, octene oxide, alkyl glycidyl ether, alkyl glycidyl ester, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monoethyl ether, monoethylene glycol monopropyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethyl ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, monopropylene glycol monoethyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monoethyl ether, monopropylene glycol monopropyl ether, dipropylene glycol monopropyl ether, tripropylene glycol monopropyl ether, monopropylene glycol monobutyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monobutyl ether, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, tripropylene glycol, diethylene glycol monobutyl ether, monoethylene glycol dimethyl ether (monoglyme), diethylene glycol dimethyl ether, ethylene glycol diethyl ether,Examples of the ethyl ether include diethylene glycol diethyl ether, triethylene glycol dimethyl ether, diethylene glycol dibutyl ether, dimethoxytetraethylene glycol, dipropylene glycol dimethyl ether, monopropylene glycol monomethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, ethylene glycol monophenyl ether, ethylene glycol methyl ether, ethylene glycol ethyl ether, 3-methoxy-3-methyl-1-butanol, diethylene glycol monohexyl ether, diethylene glycol ethyl methyl ether, and dipropylene glycol ethyl methyl ether.

[0035] <(e3) Esters (excluding (e2) ethers)> Examples of (e3) esters (excluding (e2) ethers) include monoester solvents, ester solvents having two carbonyl groups, carbonate ester solvents, and cyclic ester solvents. Specific examples of (e3) components include methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, see-butyl acetate, methoxybutyl acetate, amyl acetate, soybean fatty acid methyl esters, methyl lactate, ethyl lactate, propyl lactate, dibasic acid esters (DBE), ethyl acetoacetate, γ-butyrolactone, dimethyl carbonate, diethyl carbonate, dimethyl oxalate, and diethyl oxalate.

[0036] <(e4) Alcohols (excluding (e2) ethers)> (e4) Alcohols (excluding (e2) ethers) include monoalcohol-based solvents. Specific examples of the (e4) component include ethanol, methanol, 1-propanol, isopropyl alcohol, 1-butanol, isobutyl alcohol, tertiary butanol, secondary butyl alcohol, benzyl alcohol, diacetone alcohol, 2-propyn-1-ol, and 2-ethylhexanol.

[0037] <(e5) Amide compound> (e5) Amide compound is a cyclic or acyclic compound having an amide bond. Examples of the (e5) component include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, 2-pyrrolidone, 3-methoxy-N,N-dimethylpropanamide, 3-butoxy-N,N-dimethylpropanamide, dimethylformamide, dimethylacetamide, and dimethylacetoacetamide.

[0038] <(e6) Chloroolefin> (e6) Chloroolefin is an olefin compound containing carbon and chlorine atoms and may further contain hydrogen or fluorine atoms. (e6) component includes trans-1,2-dichloroethylene and trichloroethylene, which are hydrochloroolefins containing hydrogen atoms, tetrachloroethylene (perchloroethylene), 1,1-dichloro-2,3,3,3-tetrafluoropropene (CFO-1214ya), 1,1,2-trichloro-3,3,3-trifluoropropene (CFO-1213xa), and the like, which do not contain hydrogen atoms.

[0039] ≪(e7) Hydrobromocarbon≫ (e7) Hydrobromocarbon is a compound consisting of only carbon, bromine and hydrogen atoms. Examples of the (e7) component include normal propyl bromide (1-bromopropane) and isobutyl bromide.

[0040] <(e8) Hydrofluorocarbon> (e8) Hydrofluorocarbon (HFC) is a compound consisting of only carbon atoms, fluorine atoms and hydrogen atoms, and does not have a carbon-carbon double bond. (c8) component, for example, 1,1,1,3,3-pentafluorobutane (HFC-365mfc), 1,1,2,2,3,3,4-heptafluorocyclopentane (HFC-c447ef), 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane, 1,1,1,2,2,3,4,5,5,5-decafluoropentane (HFC-43-10mee). (c8) component commercially available products include Solkan (registered trademark) 365mfc (manufactured by Nippon Solvay Co., Ltd.), Zeorora (registered trademark) H (manufactured by Nippon Zeon Co., Ltd.), etc. 2,3,3,3-hexafluoropropyl methyl ether and the like.

[0041] <<(e9) Chlorinated hydrocarbons (excluding (e6) chloroolefins and (C) components)>> (e9) Chlorinated hydrocarbons (excluding (e6) chloroolefins and (C) component) are hydrocarbon solvents that contain chlorine atoms and carbon atoms and may contain hydrogen atoms. (e10) component includes methylene chloride, etc.

[0042] The (E) component may be one type or a combination of two or more types.

[0043] <<(F) Additives>> The (F) additive is not particularly limited as long as it is a component commonly used in the field of solvent compositions. The (F) additive may be one or more selected from the group consisting of water, ultraviolet absorbers, antioxidants, rust inhibitors, antifoaming agents, surfactants, chelating agents, etc. Note that the (E) component that acts as the (F) component is included in the (F) component.

[0044] The ultraviolet absorber and the antioxidant are components that improve the stability of the solvent composition during long-term storage, etc. Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and hindered amine-based ultraviolet absorbers. Examples of the antioxidant include phenol-based antioxidants, amine-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants.

[0045] Phenolic antioxidants include 2,6-di-t-butyl-4-methylphenol, triethylene glycol-bis[3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5-di-t-butylanilino)-1,3,5-triazine, pentaerythrityl-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 2,2-thio- Diethylene bis[3-(3,5-di-t-butyl-hydroxyphenyl)propionate], octadodecyl-3-[3,5-di-t-butyl-4-hydroxyphenyl]propionate], N,N-hexamethylene bis(3,5-di-t-butyl-4-hydroxy-hydrocinnamide), 3,5-di-t-butyl-4-hydroxy-benzylphosphonate-diethyl ester, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, 2,4-bis[(octylthio)methyl]-o-cresol, and the like.

[0046] Examples of the amine-based antioxidant include alkylated diphenylamine, tris-(3,5-di-t-butyl-4-hydroxybenzyl)-isocyanurate, N,N-di-sec-butyl-p-phenylenediamine, p-phenylenediamine derivatives, and 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethyl)isocyanurate. Examples of sulfur-based antioxidants include 2,4-bis[(octylthio)methyl]-o-cresol, dilauryl-3,3-thiodipropionate, dimyristyl-3,3-didipropionate, distearyl-3,3-thiodipropionate, pentaerythrityl tetrakis(3-laurylthiopropionate), ditridecyl-3,3-thiodipropionate, 2-mercaptobenzimidazole, bis[2-methyl-4-(3-n-alkylthiopropionyloxy)-5-t-butylphenyl]sulfide, etc. Examples of phosphorus-based antioxidants include tris-nonylphenyl phosphite, triphenyl phosphite, tris(2,4-di-t-butylphenyl)phosphite, tris(isodecyl)phosphite, etc.

[0047] The chelating agent may be an aminocarboxylic acid-based chelating agent, and preferred are hydroxyethylaminoacetic acid, hydroxyethyliminodiacetic acid, ethylenediaminetetraacetic acid, and salts thereof.

[0048] Examples of the rust inhibitor include cyclohexylamine, dicyclohexylamine, and N,N-bis(2-hydroxyethyl)-N-cyclohexylamine. Examples of the surfactant include nonionic surfactants, and preferred are higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid esters of sorbitol and sorbitan, sucrose fatty acid esters, silicone surfactants, and fluorine-based surfactants.

[0049] The component (F) other than the above-mentioned components is not particularly limited as long as it is a component commonly used in the field of solvent compositions, and can be used as appropriate. The (F) component may be one type or a combination of two or more types.

[0050] <<Preferred embodiments of components other than component (A) and component (B)>> It is preferable that the solvent composition further contains at least one member selected from the group consisting of (C) hydrofluoroolefin and (D) propylene glycol monomethyl ether.

[0051] <Composition of Solvent Composition> In the solvent composition, the contents of each component are as follows.

[0052] When the total of the (A) and (B) components is 100 parts by weight, the content of the (A) component is 30 to 80 parts by weight. When the total of the (A) and (B) components is 100 parts by weight, if the content of the (A) component is less than 30 parts by weight, the residual property and the oil cleanability tend to be poor. When the total of the (A) and (B) components is 100 parts by weight, if the content of the (A) component is more than 80 parts by weight, the cutting oil cleanability tends to be poor.

[0053] When the total of the (A), (B), (C), and (D) components is 100 parts by mass, it is preferable that the content of the (A) component is 30 parts by mass or more and 70 parts by mass or less, the content of the (B) component is 10 parts by mass or more and less than 70 parts by mass, the content of the (C) component is 0 parts by mass or more and 20 parts by mass or less, and the content of the (D) component is 0 parts by mass or more and 40 parts by mass or less, and here, at least one of (C) and (D) is more than 0 parts by mass.

[0054] When the solvent composition contains the (C) component, when the total content of the (A) component and the (C) component is taken as 100 parts by mass, the content of the (C) component is preferably more than 0 parts by mass and less than 30 parts by mass, and particularly preferably 3 parts by mass or more and 25 parts by mass or less.

[0055] From the viewpoint of achieving a superior effect as a solvent composition, the total content of components (A), (B), (C) and (D) is preferably 85 to 100 parts by weight, particularly preferably 90 to 100 parts by weight, when the entire composition is taken as 100 parts by weight, with the remainder being components (E) and (F).

[0056] [Method of producing solvent composition] The solvent composition can be produced by any method. The raw material components contained in the solvent composition can be produced by appropriately selecting a known method, for example, by carrying out one or more means selected from the group consisting of stirring, mixing, dissolving, and dispersing.

[0057] [Uses of the solvent composition] The solvent composition is preferably used as a cleaning agent. Specifically, since the solvent composition has excellent oil solubility, it is preferably used as a cleaning agent for cleaning an object to be cleaned having one or more selected from the group consisting of oily dirt and oil attached thereto.

[0058] <<Oil>> Examples of oils include mineral oils, vegetable oils, animal oils, heavy oils, waxes, and silicone oils, etc. These oils may be used, for example, as cutting oils, press oils, drawing oils, heat treatment oils, rust-preventive oils, lubricating oils, metal processing oils (e.g., lubricants for metal plastic processing), greases, asphalts, and water-soluble oils.

[0059] The mineral oil is not particularly limited, and a commercially available product is Pulley SF Oil (manufactured by Idemitsu Kosan Co., Ltd.). Examples of vegetable oils include olive oil, linseed oil, tung oil, sesame oil, safflower oil, soybean oil, castor oil, cottonseed oil, coconut oil, corn oil, and dehydrated castor oil. Fatty acids constituting vegetable oils are saturated or unsaturated fatty acids of C12 to C18, and specific examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, and eleostearic acid. Examples of animal oils include fish oil, whale oil, lard, and beef tallow. Examples of heavy oils include asphaltene. Examples of resins include pitch and rosin. Examples of waxes include vegetable, animal, petroleum, and synthetic hydrocarbons.

[0060] Silicone oil is a linear polymer of siloxane bond, and may be mainly dimethyl silicone oil or methylphenyl silicone oil with other organic groups such as carboxyl group, amino group, polyether group or epoxy group introduced into the side chain or end.Specific examples of such silicone oil include dimethylpolysiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, polyoxyethylene-methylpolysiloxane, etc.Commercially available products of such silicone oil include KF-96H, KF-96L-2CS, KF-6012, etc. manufactured by Shin-Etsu Chemical Co., Ltd.

[0061] <<Oily stains>> The oil that is the raw material of the oily stain is as described above. The oily stain may contain dust. The oily stain may include non-polar oily stain, oily stain caused by polar components, and oily stain caused by multiple components with different polarities, depending on the polarity of the oil.

[0062] <Material of the item to be cleaned> The material of the object to be cleaned is not particularly limited, and examples thereof include metals, fibers, glass, ceramics, rubber, and plastics. Examples of metals include silver, zinc, nickel, iron, aluminum, copper, manganese, magnesium, stainless steel, and aluminum alloys (alloys of aluminum and one or more metals consisting of copper, manganese, silicon, magnesium, zinc, and nickel). Examples of rubbers include nitrile rubber, butyl rubber, natural rubber, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, urethane rubber, silicone rubber, and thermoplastic elastomers (styrene-based, olefin-based, and vinyl chloride-based). Examples of plastics include polycarbonate resin, PET resin (polyethylene terephthalate resin), epoxy resin, acrylic resin, silicone resin, ABS resin (acrylonitrile-butadiene-styrene resin), polyolefin resin (polypropylene, polyethylene, etc.), and urethane resin.

[0063] Specific examples of objects to be cleaned include devices and parts thereof for obtaining the cured product of the resin, automobile parts, machine parts, steel parts, electric / electronic parts, optical parts, semiconductor parts, and display parts.

[0064] Examples of automotive parts include metal parts used for automobile shafts, frame parts, exterior parts, etc. Examples of machine parts include vacuum pumps, semiconductor manufacturing equipment, cleaning equipment, motors, bearings for fans, rollers for printing machines, parts for construction machines such as cranes, etc. Examples of automotive parts include large metal parts used for automobile shafts and frame parts, exteriors of special-purpose automobiles such as garbage trucks, and civil engineering vehicles such as bulldozers and excavators, etc. Examples of steel parts include steel plates for steel plate production lines, rolling rollers, steel pipes for piping, H-shaped steel for construction, rails for railways, etc. Examples of electrical and electronic parts include wiring boards such as printed circuit boards and ceramic boards. Examples of optical parts include optical lenses (e.g., camera lenses) and parts for optical lenses (e.g., camera housings). Examples of semiconductor-related parts include electronic parts such as IC chips and resistors. Examples of display parts include liquid crystal substrates, organic EL substrates, inorganic EL substrates, etc. The shapes of these parts are not limited to plate-like members, but may be pipe-like members or long members with circular or rectangular cross sections, or members having other complex shapes.

[0065] The object to be cleaned may be an object for daily maintenance, that is, cleaned once or twice a day, or an object for overhaul, that is, cleaned once every six months to a year, for example.

[0066] [Cleaning method] The cleaning method using the solvent composition includes a step of contacting the solvent composition with the object to be cleaned. The object to be cleaned has oily dirt and / or oil attached thereto. The oily dirt and / or oil attached to the object to be cleaned is removed from the object to be cleaned by the above step. In addition, when the oily dirt includes solid dirt such as dust, the solid dirt can be removed simultaneously with the removal of the oily dirt. The method of contacting the solvent composition with the object to be cleaned includes applying the solvent composition to the object to be cleaned, immersing the object to be cleaned in a cleaning tank containing the solvent composition, applying the vapor of the solvent composition to the object to be cleaned, and the like, and it is preferable to apply the solvent composition to the object to be cleaned. The cleaning time corresponding to the contact time of the solvent composition and the object to be cleaned is not particularly limited as long as it is a time that can remove the oily dirt and / or oil from the object to be cleaned. For example, the cleaning time may be 1 second or more and 2 hours or less.

[0067] Therefore, the cleaning method preferably includes step 1-A: applying a solvent composition to the object to be cleaned, and step 2-A: removing the solvent composition from the surface of the object to be cleaned. The cleaning method may also include, after step 1-A, step 1-A': leaving the object to be cleaned while leaving the solvent composition remaining on the surface of the object to be cleaned.

[0068] <Process 1-A> Step 1-A is a step of applying the solvent composition to the object to be cleaned. Methods for applying the solvent composition include showering, spraying, and sprinkling from a small container (such as a bucket). After applying the solvent composition to the object to be cleaned, it may be spread using a mop, a rag, a squeegee, or a wiper. It is preferable that the cleaning surface of the object to be cleaned is uniformly wetted with the solvent composition by step 1-A.

[0069] <Process 1-A'> Step 1-A' is a step of leaving the solvent composition remaining on the surface of the object to be cleaned. Since the solvent composition has excellent residual properties, when the cleaning method includes step 1-A', the solvent composition dissolves the dirt, and the effect of removing the dirt from the surface of the object to be cleaned can be more efficiently exhibited. In step 1-A', when the solvent composition does not remain on the surface of the object to be cleaned, that is, when the solvent composition volatilizes from the surface of the object to be cleaned and is completely lost, the dirt remains on the surface of the object to be cleaned. In step 1-A', the amount of the solvent composition remaining on the surface of the object to be cleaned may be 50% by weight or more of the solvent composition applied in step 1-A, or may be 60 to 95% by weight of the solvent composition applied in step 1-A.

[0070] In step 1-A', the remaining solvent composition may be left for any time period as long as the solvent composition dissolves the dirt and does not volatilize to such an extent that the dirt remains on the surface of the object to be cleaned. The time period for leaving the solvent composition in step 2 is preferably 5 to 20 minutes, and particularly preferably 5 to 10 minutes.

[0071] <Process 2-A> Step 2-A is a step of removing the solvent composition from the surface of the object to be cleaned. By step 2-A, the solvent composition containing the dirt is removed from the surface of the object to be cleaned. The method of removing the solvent composition in step 2-A includes a physical removal method and a chemical removal method.

[0072] Physical removal methods include scraping with a deck brush or the like, wiping or sweeping away with a mop, rag, sponge or the like, wiping off with a rubber wiper, and blowing away with an air knife.

[0073] The chemical removal method includes a method of removing the solvent composition by volatilization. The means for volatilization include leaving, standing, blowing air, heating, etc. When an air knife is used as a physical removal method, volatilization may be performed by blowing air with an air knife.

[0074] In step 2-A, it is preferable to carry out a physical removal method followed by a chemical removal method, and therefore it is preferable that step 2-A includes the following steps 2-A-1 and 2-A-2. Step 2-A-1: physically removing the solvent composition from the surface of the object to be cleaned; and Step 2-A-2: A step of removing by volatilization the solvent composition remaining on the surface of the object to be cleaned after the physically removing step.

[0075] When step 2-A includes steps 2-A-1 and 2-A-2, dirt can be removed efficiently. In step 2-A-1, the solvent composition does not need to be completely removed, and the solvent composition may remain on the surface of the object to be cleaned in a thin wet form, but from the viewpoint of cleanliness, the less the solvent composition remains, the more desirable it is. Step 2-A-2 is performed after step 2-A-1. Step 2-A-2 is a step of removing the thin solvent composition remaining in step 2-A-1 by volatilization. This step removes the solvent composition and dirt from the surface of the object to be cleaned.

[0076] The cleaning method including a step of contacting the solvent composition with the object to be cleaned can be appropriately selected from cleaning methods including the steps of surface cleaning, immersion cleaning, steam cleaning, shower cleaning, wiping cleaning, spray cleaning, pouring cleaning, ultrasonic cleaning, barrel cleaning, or a combination thereof.

[0077] Here, "surface cleaning" refers to a cleaning method in which a solvent composition (cleaning agent) is applied to a surface such as a floor surface, a wall surface, a board surface, or a curved surface of a roller by showering or the like, and left to remain, thereby removing objects to be cleaned such as dirt and foreign matter attached to the surface. In surface cleaning, the solvent composition is removed by wiping with a rag (cloth) or sweeping with a brush, or by using a shower or air force. Thus, surface cleaning is different from steam cleaning, which includes a step of contacting an object to be cleaned with the vapor of the solvent composition, or immersion cleaning, which includes a step of immersing an object to be cleaned in a cleaning tank containing the solvent composition.

[0078] As for cleaning methods other than surface cleaning, methods and means known to those skilled in the art can be applied.

[0079] The cleaning method is preferably surface cleaning. When the cleaning method is surface cleaning, the object to be cleaned can be cleaned even in cases where it is not possible to immerse it in a cleaning tank. Examples of such objects to be cleaned include the above-mentioned automobile parts, machine parts, and steel parts. Therefore, when the cleaning method is surface cleaning, the object to be cleaned is preferably selected from automobile parts, machine parts, and steel parts.

[0080] Furthermore, when the cleaning method is surface cleaning, the cleaning method preferably includes the following steps. Step 1-A: applying a solvent composition to an object to be cleaned; Step 1-A': A step of leaving the solvent composition remaining on the surface of the object to be cleaned; Step 2-A-1: physically removing the solvent composition from the surface of the object to be cleaned; and Step 2-A-2: A step of removing the solvent composition remaining on the surface of the object to be cleaned by volatilization after the physical removing step. EXAMPLES

[0081] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, unless otherwise specified, parts are parts by weight.

[0082] The components used in the examples are as follows. The compositions of the examples and comparative examples were prepared according to the compositions (parts by mass) in the table by using the following solvents as is or by mixing each solvent. The boiling points are the values ​​listed in the SDS of each product.

[0083] 1. Ingredients used (A-1): Daphne MX: Daphne Alpha Cleaner MX manufactured by Idemitsu Kosan Co., Ltd., 2,2,4,6,6-pentamethylheptane 90 to 100% by weight (boiling point 173°C, flash point 50°C, distillation properties: IBP (initial boiling point): 173.5°C, EP (dry point): 177.5°C) (A-2) MARUKAZOL R: Manufactured by Maruzen Petrochemical Co., Ltd. Contains 2,2,4,6,6-pentamethylheptane as the main component and 2,2,4,4,6-pentamethylheptane. Boiling point 177℃, IBP (initial boiling point) 177.9℃, EP (dry point) 181.6℃.

[0084] (B-1): HFE-347pc-f (abbreviated as "HFE347" in the table): Asahiklin AE-3000 manufactured by AGC Corporation: 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (boiling point 16°C) (B-2): NOVEC7100: Manufactured by 3M Japan Ltd.: A mixture of methyl nonafluorobutyl ether and methyl nonafluoroisobutyl ether (boiling point 61°C) (B-3): NOVEC7200: 3M Japan Ltd.: mixture of ethyl nonafluorobutyl ether and ethyl nonafluoroisobutyl ether (boiling point 76°C) (B-4): NOVEC7300: 3M Japan Ltd.: 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane (boiling point 97.8°C)

[0085] (C-1): 1233Z: Manufactured by Central Glass Co., Ltd. HCFO-1233zd(Z): cis-1-chloro-3,3,3-trifluoropropene (boiling point 39°C) (C-2): AS-300: AMOLEA manufactured by Central Glass Co., Ltd. AS-300: A mixture of Z-1-chloro-2,3,3-trifluoroprop-1-ene and E-1-chloro-2,3,3-trifluoroprop-1-ene (boiling point 54°C) (D): Propylene glycol monomethyl ether (1-methoxy-2-propanol, abbreviated as "PGM" in the table): manufactured by Sankyo Chemical Co., Ltd. (boiling point 120°C, flash point 32°C)

[0086] (E-1): Naphthesol 200: Manufactured by JXTG Energy Corporation Naphthenic hydrocarbons (boiling point 190-220℃, flash point 70℃) (E-2) Vegesol CM: Manufactured by Kaneda Co., Ltd. Fatty acid methyl ester (boiling point >140℃, flash point >164℃)

[0087] 2.Oil (1) Cutting oil: Mineral oil (Idemitsu Kosan Co., Ltd., Margplus ST25) (hydrogenated low viscosity paraffin 90% by mass or more and 100% by mass or less, hydrogenated medium viscosity paraffin 1% by mass or less and less than 10% by mass, 2,6-di-t-butyl-4-cresol 0.25% by mass or less and less than 1% by mass, solvent refined paraffin oil 0.1% by mass or more and 1% by mass or less, lubricating oil additives less than 7% by mass, viscosity 10.8 mm 2 / s(40℃) (2) Release oil: Silicone oil (KF-96H, manufactured by Shin-Etsu Chemical Co., Ltd., viscosity 10,000 cSt (25°C))

[0088] 3.Other Products (1) Stainless steel plate: Iwata Manufacturing Co., Ltd. TS50-100-06 (material: SUS304, 50 x 100 mm surface) (2) Tissue paper: 100% pulp made by Askul Corporation, 210mm x 197mm

[0089] 4. Test Example Test Examples 1 to 4 were carried out. The detergent was shaken to make it uniform immediately before use. The oil or detergent was dropped using a Pasteur pipette.

[0090] Test Example 1 Residual Test Ten drops of the detergent were placed in the center of a stainless steel plate. The time it took for the detergent to dry and the time it took for the detergent to blend with the oil were measured. Residual properties were evaluated according to the following criteria. When the result of Test Example 1 was "◎ or ◯", it was judged to be "excellent residual properties". ◎: Did not dry even after 10 minutes 〇: Dry within 10 minutes or more than 5 minutes △: Dry within 5 minutes after 1 minute ×: Dry within 1 minute

[0091] Test Example 2: Cleaning test The cleaning test was conducted according to the following procedure. 1. One drop of oil was dropped onto the center of the stainless steel plate and spread with a tissue paper folded four times. 2. Ten drops of the cleaning agent were dropped onto the center of the stainless steel plate and immediately wiped with a tissue paper folded four times to check for the presence or absence of oil. 3. If oil remained, the operation in "2." was repeated. The cleaning performance was evaluated according to the following criteria. In Test Example 2, when the result for the cutting oil was "◎" and the result for the release oil was "◎ or 〇", it was determined that "the cleaning performance is excellent". ◎: Oil was removed with one wiping and cleaning. 〇: Oil was removed with two wipings and cleanings. △: Oil was removed with three wipings and cleanings. ×: Oil could not be removed with three wipings and cleanings. -: It was impossible to distinguish between oil and the cleaning agent, and a judgment could not be made.

[0092] Test Example 3 Cleaning Test after Residual Cleaning Agent The cleaning test after residual cleaning agent was conducted according to the following procedure. 1. One drop of oil was dropped onto the center of the stainless steel plate and spread with a tissue paper folded four times. 2. Ten drops of the cleaning agent were dropped onto the center of the stainless steel plate and left for 5 minutes with the cleaning agent remaining. Then, it was wiped with a tissue paper folded four times to check for the presence or absence of oil. 3. If oil remained, ten drops of the cleaning agent were dropped onto the center of the stainless steel plate and left for 5 minutes with the cleaning agent remaining. Then, it was immediately wiped with a tissue paper folded four times to check for the presence or absence of oil. 4. If oil remained, the operation in "3." was repeated. The cleaning performance after residual cleaning agent was evaluated according to the following criteria. In Test Example 3, when the result was "◎", it was determined that "the cleaning performance after residual cleaning agent is excellent". ◎: Oil was removed with one wiping and cleaning. 〇: Oil was removed with two wipings and cleanings. △: Oil was removed with three wipings and cleanings. ×: Oil could not be removed by wiping and cleaning three times. -: It is difficult to distinguish between oil and detergent, and it is difficult to make a judgment.

[0093] Test Example 4 Drying Test After cleaning the oil in Test Example 2, the drying property after removal of the cleaning agent was evaluated according to the following criteria. In Test Example 4, when the result was "Good", it was judged to be "excellent in drying property after removal". 〇: Dry within 1 minute △: Dry within 5 minutes after 1 minute ×: Did not dry for more than 5 minutes

[0094] The results are summarized in Tables 1 and 2 below.

[0095] [Table 1]

[0096] [Table 2]

[0097] The following can be seen from Tables 1 and 2. The solvent compositions of the examples were excellent in residual properties and drying properties after removal, and also had excellent cleaning properties for various oils. Thus, even when used for wiping, the solvent compositions of the examples had excellent drying properties and excellent cleaning properties for various oils.

[0098] The solvent compositions of the comparative examples were inferior in at least one of the properties of remaining property, drying property, and cleaning property. In Comparative Examples 1 and 2, when the total of (A) and (B) is 100 parts by mass, (A) exceeds 80 parts by mass. In Comparative Examples 1 and 2, the cleaning property of the cutting oil is poor in Test Example 2. In Comparative Example 4, when the total of (A) and (B) is 100 parts by mass, (A) is less than 30 parts by mass. In Comparative Example 4, the results of Test Examples 1 to 3 were poor. Comparative Examples 3 and 5 include (A) and (C) but do not include (B). Comparative Examples 3 and 5 were inferior in the results of Test Examples 1 to 3. Comparative Examples 6 to 11 were poor in residual properties in Test Example 1. Therefore, in Comparative Examples 6 to 11, in Test Examples 2 and 3, the detergent dried before it could take up dirt, and the cleaning properties were poor. Comparative Examples 12 to 14 were excellent in residual properties in Test Example 1. However, Comparative Example 13, in particular, was inferior in drying properties after removal in Test Example 4, so that the cleaning agent containing the dirt was likely to remain on the surface of the object to be cleaned, and the number of times of wiping and cleaning was increased.

Claims

1. (A) a hydrocarbon containing at least one selected from the group consisting of 2,2,4,4,6-pentamethylheptane and 2,2,4,6,6-pentamethylheptane; (B) containing a hydrofluoroether, The content of (A) is 30 to 80 parts by mass when the total amount of the (A) component and the (B) component is 100 parts by mass. Solvent composition.

2. 2. The solvent composition according to claim 1, wherein the boiling point of component (A) is in the range of 170 to 190° C.

3. The solvent composition according to claim 1, wherein the component (B) is at least one selected from the group consisting of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether and 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane.

4. The solvent composition according to claim 1, further comprising at least one member selected from the group consisting of (C) a hydrofluoroolefin and (D) propylene glycol monomethyl ether.

5. The solvent composition according to claim 4, wherein the component (C) is at least one selected from the group consisting of cis-1-chloro-3,3,3-trifluoropropene, Z-1-chloro-2,3,3-trifluoroprop-1-ene, and E-1-chloro-2,3,3-trifluoroprop-1-ene.

6. 5. The solvent composition according to claim 4, wherein, when the total amount of the components (A), (B), (C), and (D) is 100 parts by mass, the amount of the component (A) is 30 parts by mass or more and 70 parts by mass or less, the amount of the component (B) is 10 parts by mass or more and less than 70 parts by mass, the amount of the component (C) is 0 parts by mass or more and 20 parts by mass or less, and the amount of the component (D) is 0 parts by mass or more and 40 parts by mass or less, and the amount of at least one of the components (C) and (D) exceeds 0 parts by mass.

7. The solvent composition according to any one of claims 1 to 6, which is a cleaning agent.

8. A cleaning method using the solvent composition according to any one of claims 1 to 6, A step of applying the solvent composition to an object to be cleaned; leaving the solvent composition remaining on the surface of the object to be cleaned; physically removing the solvent composition from the surface of the object to be cleaned; and A cleaning method comprising the step of removing the solvent composition remaining on the surface of the object to be cleaned by volatilization after the physical removing step.

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