Halogen-based cleaning composition

Abstract

To provide a detergent that has higher detergency than those of conventionally well-known detergents.SOLUTION: A composition containing fluoroiodoalkane is used as a detergent.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a solvent composition that can be used in a wide range of applications, such as a cleaning solvent and a dilution coating solvent. [Background technology]

[0002] Electronic components, precision machinery components, optical components, etc. become contaminated with flux, processing oil, wax, mold release agents, dust, etc. during the manufacturing process, so they are cleaned with cleaning solvents during the manufacturing process, assembly process, final finishing process, etc.

[0003] As a solvent for such applications, for example, compositions containing 1-chloro-3,3,3-trifluoro-1-propene or 1-chloro-2,3,3-trifluoro-1-propene have been disclosed (Patent Document 1, Patent Document 2). The compositions containing 1-chloro-3,3,3-trifluoro-1-propene have been found to be non-flammable, have low toxicity, have excellent stability, do not attack substrates such as metals, plastics, and elastomers, and have excellent chemical and thermal stability. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-249326 A [Patent Document 2] WO2017 / 122801 publication Summary of the Invention [Problem to be solved by the invention]

[0005] There is a demand for solvents with high cleaning power that can more quickly clean and remove oily components such as flux, processing oil, and wax adhering to objects to be cleaned, but the cleaning ability of the fluoropropene compositions disclosed in Patent Documents 1 and 2 was insufficient. [Means for solving the problem]

[0006] As a result of extensive investigations aimed at solving the above problems, the present inventors discovered that a composition containing a fluoroiodoalkane is nonflammable and has high detergency, thereby completing the present invention. Effect of the Invention

[0007] The present invention can provide a cleaning composition having a significantly higher cleaning power than conventionally known non-flammable solvents. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be specifically described below.

[0009] The present invention relates to cleaning compositions containing fluoroiodoalkanes.

[0010] In the present invention, the fluoroiodoalkane refers to an alkane (saturated hydrocarbon compound) having at least a fluoro group and an iodine group. The fluoroiodoalkane is preferably a fluoroiodoalkane having 1 to 10 carbon atoms, more preferably a fluoroiodoalkane having 2 to 4 carbon atoms, and even more preferably a fluoroiodoalkane having 2 carbon atoms.

[0011] In the present invention, the fluoroiodoalkane is not particularly limited, but examples thereof include fluoroiodoethane, fluoroiodopropane, fluoroiodobutane, fluoroiodopentane, fluoroiodohexane, fluoroiodoheptane, fluoroiodooctane, fluoroiodononane, fluoroiododecane, fluoroiodocyclopropane, fluoroiodocyclobutane, fluoroiodocyclopentane, fluoroiodocyclohexane, fluoroiodocycloheptane, fluoroiodocyclooctane, fluoroiodocyclononane, and fluoroiodocyclodecane. Among these, one or more selected from the group consisting of fluoroiodoethane, fluoroiodopropane, and fluoroiodobutane are preferred in terms of excellent drying properties, and fluoroiodoethane is more preferred in terms of high detergency.

[0012] In the present invention, the fluoroiodoalkane may be linear, cyclic, or branched, as exemplified above.

[0013] In the present invention, the fluoroiodoethane is not particularly limited, and examples thereof include 2-fluoro-2-iodoethane, 2,2-difluoro-2-iodoethane, 1-fluoro-2-iodoethane, 1,2-difluoro-2-iodoethane, 1,2,2-trifluoro-2-iodoethane, 1,1-difluoro-2-iodoethane, 1,1,2-trifluoro-2-iodoethane, 1,1,2,2-tetrafluoro-2-iodoethane, 1,1,1-trifluoro-2-iodoethane, 1,1,1,2-tetrafluoro-2-iodoethane, 1,1,1,2,2-pentafluoro-2-iodoethane, and the like are included. In terms of ease of availability, one or more of 1-fluoro-2-iodoethane, 1,1-difluoro-2-iodoethane, and 1,1,1-trifluoro-2-iodoethane are preferred. In terms of non-flammability and stability, 1,1,1-trifluoro-2-iodoethane and 1,1-difluoro-2-iodoethane are more preferred.

[0014] Incidentally, 1,1,1-trifluoro-2-iodoethane and 1,1-difluoro-2-iodoethane are known compounds and can be produced by methods known in the literature.

[0015] In the present invention, the fluoroiodopropane is not particularly limited, but examples thereof include 1-fluoro-3-iodopropane, 1-fluoro-2-iodopropane, 1,1,1-trifluoro-3-iodopropane, and heptafluoro-1-iodopropane.

[0016] In the present invention, the fluoroiodobutane is not particularly limited, but examples thereof include 1,1,1-trifluoro-4-iodobutane, 1,1,1,2,2-pentafluoro-4-iodobutane, octafluoro-1,4-diiodobutane, and nonafluorobutyl iodide.

[0017] Regarding the fluoroiodoalkane of the present invention, the above-mentioned fluoroiodoalkanes can be used alone, or two or more specific fluoroiodoalkanes can be combined and used as a composition.

[0018] The content of the fluoroalkane in the cleaning composition of the present invention containing a fluoroiodoalkane is not particularly limited, but in terms of excellent cleaning power, the content is preferably 10 to 99 wt%, more preferably 15 to 90 wt%, more preferably 20 to 80 wt%, and more preferably 30 to 80 wt%, based on 100 wt% of the cleaning composition of the present invention.

[0019] The cleaning composition of the present invention may contain a solvent other than the fluoroiodoalkane, and the solvent and the fluoroiodoalkane can be combined to be used as the cleaning composition.

[0020] In the present invention, the solvent that can be combined with the fluoroiodoalkane is not particularly limited, and examples thereof include hydrofluorocarbons, fluoroethers, hydrocarbons, ketones, alcohols, esters, ethers, amines, halogenated compounds, aromatic hydrocarbons, etc. Among these, one or more selected from the group consisting of alcohols, ethers, halogenated compounds, hydrocarbons, and aromatic hydrocarbons are preferred in terms of excellent cleaning power.

[0021] In the present invention, the hydrofluorocarbon is not particularly limited, but examples thereof include hexadecafluoro(1,3-dimethylcyclohexane), fluorocyclohexane, fluorocyclopentane, and 1,1,2,2,3,3,4-heptafluorocyclopentane.

[0022] In the present invention, the fluoroether is not particularly limited, but examples thereof include methyl 1,1,2,2-tetrafluoroethyl ether, fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether, 2-chloro-1,1,2-trifluoroethyl methyl ether, ethyl 1,1,2,2-tetrafluoroethyl ether, 1,1,2,3,3,3-hexafluoropropyl methyl ether, 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether, and 1-chloro-2,2,2-trifluoroethyl difluoromethyl ether.

[0023] In the present invention, the above-mentioned hydrocarbon is not particularly limited, but examples thereof include normal hexane, normal heptane, cyclohexane, and cycloheptane.

[0024] In the present invention, the ketone is not particularly limited, but examples thereof include acetone, 3-methyl-2-butanone, 3-pentanone, and cyclohexanone.

[0025] In the present invention, the alcohol is not particularly limited, but examples thereof include methanol, ethanol, normal propanol, isopropanol, 2,2,2-trifluoroethanol, 1-butanol, and 2-butanol.

[0026] In the present invention, the ester is not particularly limited, but examples thereof include methyl formate, ethyl formate, methyl acetate, and ethyl acetate.

[0027] In the present invention, the ether is not particularly limited, but examples thereof include dimethyl ether, ethyl methyl ether, butyl methyl ether, 2,3-dihydrofuran, 2,5-dihydrofuran, 1,3-dioxolane, 2-methylfuran, methoxycyclopentane, and tetrahydrofuran. From the viewpoint of high cleaning properties, butyl methyl ether, 2,3-dihydrofuran, 2,5-dihydrofuran, and 2-methylfuran are preferred.

[0028] In the present invention, the amine is not particularly limited, but examples thereof include pyrrole, N-methylpyrrole, 2-methylpyridine, N,N'-dimethylpiperazine, 1,4-diazabicyclo[2,2,2]octane, and normal propylamine.

[0029] In the present invention, the halogen compound is not particularly limited, but examples thereof include dichloromethane, chloroform, 1,2-dichloroethylene, 1-bromopropane, 2-bromopropane, iodoethane, 1,2-dichloroethane, 1-bromopropene, 2-bromopropene, 1-chlorobutane, 2-chlorobutane, 2-chloro-2-methylpropane, 1-bromoethane, 2-bromoethane, chlorocyclopentane, chlorocyclohexane, and 3-chloro-1-butene. In terms of low toxicity, any one or more selected from the group consisting of 1-bromopropene, 2-bromopropene, 1-chlorobutane, 2-chlorobutane, 2-chloro-2-methylpropane, 1-bromoethane, 2-bromoethane, chlorocyclopentane, chlorocyclohexane, and 3-chloro-1-butene are preferred, and in terms of high drying property, any one or more selected from the group consisting of 1-chlorobutane, 2-chlorobutane, 2-chloro-2-methylpropane, and 3-chloro-1-butene are more preferred.

[0030] In the present invention, the aromatic hydrocarbon is not particularly limited, but examples thereof include toluene, xylene, chlorobenzene, and dichlorobenzene.

[0031] Of these solvents, alcohol is preferred because of its excellent cleaning power, and more specifically, ethanol or 2,2,2-trifluoroethanol is more preferred.

[0032] When the cleaning composition of the present invention contains the above-mentioned solvent, the content of the solvent is not particularly limited, but in terms of excellent cleaning power, the content of the solvent is preferably 1 to 90 wt %, more preferably 10 to 85 wt %, and even more preferably 20 to 80 wt %, based on 100 wt % of the cleaning composition of the present invention.

[0033] The cleaning composition of the present invention may contain components other than the above components (the fluoroiodoalkane and the solvent), and although there are no particular limitations on the components, it may contain, for example, a surfactant.

[0034] The surfactant is preferably a nonionic surfactant, and examples thereof include, but are not limited to, sorbitan monooleate, sorbitan trioleate, polyoxyethylene sorbitol tetraoleate, polyoxyethylene monolaurate, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, and polyoxyethylene oleic acid amide.

[0035] When the cleaning composition of the present invention contains the surfactant, the content of the surfactant is not particularly limited, but is preferably 0.1 to 20 wt %, and more preferably 0.3 to 5 wt %, based on 100 wt % of the cleaning composition of the present invention.

[0036] From the viewpoint of safety of cleaning operations, the cleaning composition of the present invention is preferably non-flammable, and more specifically, it is preferable that the flash point is unobservable or undetectable in a flammability test by Cleveland open cup flash point measurement.

[0037] In order to evaluate the detergency of the cleaning composition of the present invention, the kauri-butanol (KB) value was measured according to the American Society for Testing and Materials standard (ASTM: D1133-13).

[0038] In terms of high solubility in processing oil, the cleaning composition of the present invention preferably has a Kauri-butanol (KB) value of 15 or more, more preferably 25 or more, more preferably 35 or more, more preferably 50 or more, more preferably 70 or more, and more preferably 90 or more.

[0039] In addition, as described below, the cleaning composition of the present invention exhibits higher cleaning properties (KB value) than conventionally known compositions, and therefore has the effect of being able to more quickly clean and remove oil and fat components that were difficult to clean and remove using conventionally known compositions.

[0040] The cleaning method of the present invention is characterized by contacting an article to be cleaned with the above-mentioned cleaning composition, and relates to a method for cleaning and removing deposits adhering to the article to be cleaned.

[0041] In the cleaning method of the present invention, the deposits to be cleaned and removed are not particularly limited, but examples thereof include flux, cutting oil, quenching oil, rolling oil, lubricating oil, machine oil, press oil, punching oil, drawing oil, assembly oil, processing oil such as wire drawing, release agent, wax, ink, dust, etc. The cleaning composition of the present invention has excellent solubility of oil and fat components such as processing oil, so it is preferably used for cleaning deposits containing oil and fat components.

[0042] In addition, the article to be cleaned according to the present invention is not particularly limited, but examples thereof include articles made of various materials such as metals, plastics, elastomers, glass, ceramics, composite materials thereof, and fabrics made of natural or synthetic fibers. More specific examples of the article to be cleaned include, but are not particularly limited to, textile products, medical instruments, precision machinery, optical articles, and parts thereof. Specific examples of textile products, medical instruments, precision machinery, optical articles, and parts thereof include, but are not particularly limited to, ICs, capacitors, printed circuit boards, micromotors, relays, bearings, optical lenses, glass substrates, and the like.

[0043] In the cleaning method of the present invention, as long as the cleaning composition of the present invention is brought into contact with an article to be cleaned, other conditions and the like are not particularly limited. By this contact, dirt adhering to the surface of the article to be cleaned can be removed.

[0044] Specific cleaning methods by contact are not particularly limited, but for example, hand wiping, immersion cleaning, spray cleaning, immersion boiling cleaning, immersion rocking cleaning, immersion ultrasonic cleaning, steam cleaning, and combinations thereof can be used. In these cleaning methods, cleaning conditions such as contact time, number of times, and temperature of the cleaning composition of the present invention at that time may be appropriately selected depending on the cleaning method. In addition, a known cleaning device can be appropriately selected depending on each cleaning method. By such contact, the deposits attached to the article to be cleaned can be washed and removed.

[0045] The cleaning method of the present invention is not particularly limited, but is preferably a cleaning method having, for example, a contact step of contacting an article to be cleaned with a liquid-phase cleaning composition and a steam contact step of exposing the article to be cleaned to steam generated by evaporating the cleaning composition after the contact step, in that the cleanliness of the article not to be cleaned can be increased. EXAMPLES

[0046] The present invention will be described in detail below with reference to examples, but the present invention should not be construed as being limited thereto. <Cleaning power evaluation> The kaurinobutanol value (KB value) was measured according to the method described in ASTM D1133-13. The higher the KB value, the higher the oil solubility, which means that the cleaning power for oils and fats is excellent. <Non-flammability evaluation> In accordance with the method described in JIS K2265, non-flammability evaluation was performed by a flammability test using a tag closed cup and a Cleveland open cup flash point measurement using an automatic flash point tester.

[0047] Example 1-1 The KB value of 1,1,1-trifluoro-2-iodoethane (Tokyo Kasei Co., Ltd.) was measured according to the method described in ASTM:D1133-13. The result was 84. Furthermore, the result of the non-flammability evaluation showed that 1,1,1-trifluoro-2-iodoethane is non-flammable.

[0048] Example 1-2 The same operation as in Example 1-1 was carried out, and the KB value of 1,1-difluoro-2-iodoethane was measured instead of 1,1,1-trifluoro-2-iodoethane. The result was 99. The result of the non-flammability evaluation showed that 1,1-difluoro-2-iodoethane was non-flammable.

[0049] Examples 1-3 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 30% by weight:70% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 64. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0050] Examples 1-4 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 40% by weight:60% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >342. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0051] Examples 1-5 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >364. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0052] Examples 1-6 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 70% by weight:30% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >338. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0053] Examples 1-7 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 90% by weight:10% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >309. The non-flammability evaluation showed that this composition was non-flammable.

[0054] Examples 1-8 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and ethanol was 40% by weight:60% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >384. The non-flammability evaluation showed that this composition was non-flammable.

[0055] Examples 1-9 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and butyl methyl ether was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 120. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0056] Examples 1-10 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2-chlorobutane was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 97. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0057] Examples 1-11 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,3-dihydrofuran was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 159. The non-flammability evaluation showed that this composition was non-flammable.

[0058] Examples 1-12 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and cyclopentane was 80% by weight:20% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 98. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0059] Examples 1-13 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and toluene was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 93. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0060] Examples 1-14 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2-chloro-2-methylpropane was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 60. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0061] Examples 1-15 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and normal propanol was 60% by weight:40% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >380. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0062] Examples 1-16 The same operation as in Example 1-1 was carried out, and the KB value of a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and isopropanol was 50% by weight:50% by weight instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was >368. The result of the non-flammability evaluation showed that this composition was non-flammable.

[0063] Comparative Example 1-1 The same procedure as in Example 1-1 was carried out, and the KB value of cyclohexane (Tokyo Chemical Industry Co., Ltd.) was measured instead of 1,1,1-trifluoro-2-iodoethane. The result was 60. The non-flammability evaluation showed that the flash point of cyclohexane was -18°C.

[0064] Comparative Example 1-2 The same operation as in Example 1-1 was carried out, and the KB value of CF3CHCHCl (CELEFIN (registered trademark) 1233z, 1-chloro-3,3,3-trifluoro-1-propene, manufactured by Central Chemical) instead of 1,1,1-trifluoro-2-iodoethane was measured. The result was 34. The result of the non-flammability evaluation showed that CF3CHCHCl was non-flammable.

[0065] Comparative Example 1-3 The same procedure as in Example 1-1 was carried out, and the KB value of a composition in which normal heptane (Tokyo Chemical Industry Co., Ltd.) and toluene (Wako Pure Chemical Industries, Ltd.) were used in place of 1,1,1-trifluoro-2-iodoethane in a volume ratio of 75% by volume:25% by volume was measured. The result was 40.

[0066] Comparative Example 1-4 The same procedure as in Example 1-1 was carried out, and the KB value of normal hexane (Kishida Chemicals) was measured instead of 1,1,1-trifluoro-2-iodoethane. The result was 30. The non-flammability evaluation showed that the flash point of cyclohexane was -22°C.

[0067] Comparative Examples 1-5 The same procedure as in Example 1-1 was carried out, and the KB value of a composition in which cyclohexane (Tokyo Chemical Industry Co., Ltd.) and ethanol (Kanto Chemical Industry Co., Ltd.) were used in place of 1,1,1-trifluoro-2-iodoethane in a volume ratio of 90% by volume:10% by volume was measured. The result was 81.

[0068] Comparative Examples 1-6 The same procedure as in Example 1-1 was carried out, and the KB value was measured using 2,2,2-trifluoroethanol (Tokyo Chemical Industry Co., Ltd.) instead of 1,1,1-trifluoro-2-iodoethane. The result was 19.

[0069] Example 2-1 0.2g of processing oil 1 (Sugicut C-168AS, manufactured by Sugimura Chemical Industry) was added to 10g of 1,1,1-trifluoro-2-iodoethane (a product of Tokyo Kasei Co., Ltd.) and then stirred. The mixture was then left to stand and its appearance (compatibility) was checked. The evaluation criteria were "good" if complete dissolution of the processing oil was confirmed without separation or suspension, and "poor" if separation or suspension occurred and complete dissolution was not confirmed. The results were good, as complete dissolution was confirmed.

[0070] Example 2-2 In Example 2-1, the same operation as in Example 2-1 was carried out, except that processing oil 2 (FBH-9S manufactured by Nippon Kogyo Co., Ltd.) was used instead of processing oil 1 (Sugicut C-168AS manufactured by Sugimura Chemical Industry Co., Ltd.) in Example 2-1, and the appearance (compatibility) was confirmed. The results were good, as complete dissolution was confirmed.

[0071] Example 2-3 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition (same as in Example 1-6) in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol was 70% by weight:30% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed.The result was good because complete dissolution was confirmed.

[0072] Examples 2-4 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 2,2,2-trifluoroethanol were mixed at a weight ratio of 80% by weight:20% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0073] Examples 2-5 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and ethanol are mixed at a weight ratio of 70% by weight:30% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0074] Examples 2-6 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and butyl methyl ether were mixed in a weight ratio of 20% by weight:80% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0075] Examples 2-7 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 2,3-dihydrofuran were mixed at a weight ratio of 20% by weight:80% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0076] Examples 2-8 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 2,5-dihydrofuran were mixed at a weight ratio of 30% by weight:70% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0077] Examples 2-9 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 2-methylfuran were mixed at a weight ratio of 10% by weight:90% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0078] Example 2-10 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and cyclopentane was 20% by weight:80% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0079] Example 2-11 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 1-butanol were mixed at a weight ratio of 30% by weight:70% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0080] Example 2-12 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and toluene was 10% by weight:90% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0081] Example 2-13 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and 2-chlorobutane was 10% by weight:90% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0082] Example 2-14 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and trans-1,2-dichloroethylene were mixed at a weight ratio of 10% by weight:90% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0083] Example 2-15 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 2-chloro-2-methylpropane were mixed at a weight ratio of 20% by weight:80% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0084] Example 2-16 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and 3-chloro-1-butene were mixed at a weight ratio of 20% by weight:80% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0085] Example 2-17 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which 1,1,1-trifluoro-2-iodoethane and normal propanol are mixed in a weight ratio of 60% by weight:40% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed.

[0086] Example 2-18 In Example 2-1, the same operation as in Example 2-1 was carried out, except that a composition in which the weight ratio of 1,1,1-trifluoro-2-iodoethane and isopropanol was 80% by weight:20% by weight was used instead of 1,1,1-trifluoro-2-iodoethane, and the appearance (compatibility) was confirmed. The result was good because complete dissolution was confirmed. In addition, the result of the non-flammability evaluation showed that this composition was non-flammable.

[0087] Comparative Example 2-1 In Example 2-1, 1,1,1-trifluoro-2-iodoethane (Tokyo Chemical Industry Co., Ltd.) was replaced with CF3CHCHCl (CELEFIN (registered trademark) 1233z, 1-chloro-3,3,3-trifluoro-1-propene, manufactured by Central Chemical Industry Co., Ltd.) in place of the 1,1,1-trifluoro-2-iodoethane (Tokyo Chemical Industry Co., Ltd.), and the same operation as in Example 2-1 was carried out, and the appearance (compatibility) was confirmed. The result was poor, since separation occurred and complete dissolution could not be confirmed.

[0088] Comparative Example 2-2 The same procedure as in Comparative Example 2-1 was carried out, except that Processing Oil 2 (FBH-9S manufactured by Nippon Kogyo Oil) was used instead of Processing Oil 1 (Sugicut C-168AS manufactured by Sugimura Chemical Industry Co., Ltd.) in Comparative Example 2-1, and the appearance (compatibility) was confirmed. The results were poor, since suspension and separation occurred and complete dissolution could not be confirmed.

[0089] The results so far are summarized in Tables 1 to 3.

[0090] [Table 1]

[0091] [Table 2]

[0092] [Table 3] [Industrial Applicability]

[0093] According to the present invention, it is possible to clean processing oils, which have been considered difficult to remove in the past, with smaller amounts of the oil, and to carry out the cleaning process in an industrially and environmentally favorable manner. Therefore, the present invention is extremely useful as a cleaning agent and cleaning method with extremely high accuracy required in the manufacture of electronic devices, precision devices, optical devices, etc.

Claims

1. A cleaning composition comprising a fluoroiodoalkane which is 1,1,1-trifluoro-2-iodoethane or 1,1-difluoro-2-iodoethane, and further comprising a solvent consisting of at least one selected from the group consisting of alcohols, ethers, halogen compounds (not including the fluoroiodoalkane), hydrocarbons, and aromatic hydrocarbons, wherein the content of the fluoroiodoalkane is 10 to 99% by weight.

2. 2. The cleaning composition according to claim 1, wherein the alcohol is ethanol, normal propanol, isopropanol, 1-butanol, or 2,2,2-trifluoroethanol.

3. 2. The cleaning composition of claim 1, wherein the ether is butyl methyl ether, 2,3-dihydrofuran, 2,5-dihydrofuran, or 2-methylfuran.

4. 2. The cleaning composition according to claim 1, wherein the halogen compound is trans-1,2-dichloroethylene, 2-chlorobutane, 2-chloro-2-methylpropane, or 3-chloro-1-butene.

5. 2. The cleaning composition of claim 1, wherein said hydrocarbon is cyclopentane.

6. 2. The cleaning composition of claim 1, wherein said aromatic hydrocarbon is toluene.

7. 2. The cleaning composition according to claim 1, wherein the content of said solvent is 1 to 90% by weight.

8. 2. The cleaning composition according to claim 1, having a KB value (kaulinobutanol value) of 35 or more.

9. 2. The cleaning composition according to claim 1, characterized in that it has no detectable flash point in a Cleveland open cup flash point test.

10. A cleaning method comprising contacting an article to be cleaned with the cleaning composition according to claim 1.

11. The cleaning method according to claim 10, further comprising cleaning off any deposits adhering to the article to be cleaned.

12. 12. The cleaning method according to claim 11, wherein the deposit contains at least processing oil.

13. 13. The cleaning method according to claim 12, wherein the processing oil is at least one oil selected from the group consisting of cutting oil, quenching oil, rolling oil, lubricating oil, machine oil, press processing oil, punching oil, assembly oil, and wire drawing oil.

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