Halogen-based cleaning composition

Abstract

To provide a washing agent which has a higher washing power in comparison with the conventionally known washing agents.SOLUTION: A composition for washing comprising a fluoroiodoalkane and one or more chlorofluorocarbons is used as a washing agent.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] 2. Description of the Related Art Electronic components, precision machinery components, optical components, and the like become contaminated with flux, processing oil, wax, mold release agents, dust, and the like during the manufacturing process. Therefore, these components are cleaned with cleaning solvents during the manufacturing process, assembly process, final finishing process, and the like.

[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 (see, for example, Patent Documents 1 and 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] JP2013-249326A [Patent Document 2] International Publication No. 2017 / 122801 Brochure Summary of the Invention [Problem to be solved by the invention]

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

[0006] As a result of extensive research aimed at solving the above problems, the inventors discovered that a cleaning composition containing a fluoroiodoalkane and one or more chlorofluorocarbons is nonflammable and has high cleaning power, thereby completing the present invention. Effect of the Invention

[0007] 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 perform cleaning using an industrially and environmentally favorable method. Therefore, the present invention is extremely useful as a cleaning agent and cleaning method for the extremely high precision required in the manufacture of electronic devices, precision devices, optical devices, etc. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described in detail 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 used in the present invention is preferably a fluoroiodoalkane having 1 to 10 carbon atoms, more preferably a fluoroiodoalkane having 2 to 4 carbon atoms, and particularly preferably a fluoroiodoalkane having 2 carbon atoms.

[0011] In the present invention, the fluoroiodoalkane may be linear, cyclic, or branched.

[0012] 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.

[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, Examples of the iodoethane include 1,1,1,2-tetrafluoro-2-iodoethane and 1,1,1,2,2-pentafluoro-2-iodoethane. 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 kinds of fluoroiodoalkanes can be combined and used as a composition.

[0018] In the cleaning composition containing the fluoroiodoalkane of the present invention, the content of the fluoroiodoalkane is not particularly limited, but in terms of excellent cleaning power, it is preferably 10 to 99 volume % based on 100 volume % of the cleaning composition of the present invention, and in terms of excellent cost, it is more preferably 10 to 20 volume %.

[0019] In the present invention, the compound used in combination with the fluoroiodoalkane is one or more chlorofluorocarbons.

[0020] In the present invention, the chlorofluorocarbon is not particularly limited, but examples thereof include 1,1,2-trichloro-1,2,2-trifluoroethane, 1,1-dichloro-1-fluoroethane, 3,3-dichloro-1,1,1,2,2-pentafluoropropane, 1,3-dichloro-1,1,2,2,3-pentafluoropropane, 1,1,1,3,3-pentafluorobutane, 1-chloro-3,3,3-trifluoro-1-propene, and 1-chloro-2,3,3-trifluoro-1-propene.

[0021] In the cleaning composition of the present invention, the content of chlorofluorocarbons is not particularly limited, but in terms of excellent cleaning power, it is preferably 90 to 1 volume % based on 100 volume % of the cleaning composition of the present invention, and in terms of excellent cost, it is more preferably 90 to 80 volume %.

[0022] The cleaning composition of the present invention may contain components other than the above-mentioned components (fluoroiodoalkane and chlorofluorocarbon), and although there are no particular limitations thereon, it may contain, for example, a surfactant.

[0023] 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.

[0024] When the cleaning composition of the present invention contains a 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.

[0025] 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 not observed or is not detectable in a flammability test by Cleveland open cup flash point measurement.

[0026] The cleaning method of the present invention relates to a method for cleaning and removing deposits attached to an article to be cleaned by contacting the article to be cleaned with the above-mentioned cleaning composition.

[0027] 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, wire drawing oil and other processing oils, release agents, wax, ink, dust, etc. The cleaning composition of the present invention has excellent solubility for oil and fat components such as processing oils, and is therefore effective when used to clean deposits containing oil and fat components.

[0028] 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.

[0029] In the cleaning method of the present invention, as long as the cleaning composition of the present invention is brought into contact with the article to be cleaned, other conditions are not particularly limited. By this contact, the deposits (dirt) adhering to the surface of the article to be cleaned can be removed.

[0030] Specific contact cleaning methods are not particularly limited, but may include, for example, hand wiping, immersion cleaning, spray cleaning, immersion boiling cleaning, immersion rocking cleaning, immersion ultrasonic cleaning, steam cleaning, and combinations thereof. In these cleaning methods, cleaning conditions such as contact time, number of contacts, 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 may 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.

[0031] 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

[0032] 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.

[0033] Examples 1 to 3 and Comparative Examples 1 to 2 The compositions of the cleaning compositions used in the solubility tests are shown in Table 1.

[0034] <Solubility test> To 10 ml of each of the prepared cleaning compositions, 0.2 ml each of processing oil 1 (Nonluster P333, manufactured by Yushiro Chemical Industry Co., Ltd.), processing oil 2 (Sandrow D-835AW, manufactured by Sugimura Chemical Industry Co., Ltd.), and processing oil 3 (Shell Molina S2BA, manufactured by Showa Shell Sekiyu Co., Ltd.) were added, and then stirred. After that, the mixture was left to stand and the appearance (compatibility) was confirmed. As the evaluation criteria, a case where complete dissolution of the processing oil was confirmed without separation or suspension was rated as "good", and a case where complete dissolution was not confirmed due to separation or suspension was rated as "poor". The results are shown in Table 2.

[0035] [Table 1]

[0036] [Table 2]

[0037] As described above, the cleaning composition of the present invention exhibits higher solubility than conventionally known cleaning agents, and therefore has the effect of being able to more quickly clean and remove oil and fat components that were previously difficult to clean and remove.

Claims

1. A cleaning composition comprising 1,1,1-trifluoro-2-iodoethane and one or more chlorofluorocarbons selected from the group consisting of 1-chloro-2,3,3-trifluoro-1-propene and 1-chloro-3,3,3-trifluoro-1-propene, wherein the content of the 1,1,1-trifluoro-2-iodoethane is 10 to 20% by volume and the content of the chlorofluorocarbons is 90 to 80% by volume.

2. 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.

3. A cleaning method comprising the step of cleaning and removing deposits from an article to be cleaned by using the cleaning composition according to claim 1 or 2.

4. 4. The cleaning method according to claim 3, wherein the deposits contain at least processing oil.

5. 5. The cleaning method according to claim 4, 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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