Cleaning composition and cleaning method

Abstract

To provide a cleaning agent composition excellent in the capability of removing a (meth)acrylic resin and dust present on an article.SOLUTION: The cleaning agent composition comprises 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoro ethylether and 2-chloro-1,1,1-trifluoroethane.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Hydrofluoroethers (hereinafter also referred to as HFEs) are known to be solvents that do not have chlorine atoms in their molecules and have no effect on the ozone layer. Due to their excellent drying properties as fluorine-based solvents, HFEs are used as cleaning agents, diluents for lubricating oils, etc., and heat transfer media. Patent Document 1 discloses a method for solvent cleaning of articles, which comprises contacting the article to be cleaned with a solvent composition having a boiling point in the range of 20 to 120°C and containing a low-molecular-weight fluorinated ether having at least three carbon atoms and one or more hydrogen atoms, or its vapor, or both. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2961924 Summary of the Invention [Problem to be solved by the invention]

[0004] Cleaning removes various types of dirt from an item, including resin materials, dust, adhesives, ink, inorganic components, and organic components, and can also occur as a mixture of two or more types of dirt on a substrate.

[0005] However, in the case of stains containing dust and (meth)acrylic resin derived from adhesives or inks, the (meth)acrylic resin and the dust become integrated, and therefore the method described in Patent Document 1 may not be able to thoroughly clean the stains.

[0006] An object of the present invention is to provide a cleaning composition that is excellent in removing (meth)acrylic resins and dust from articles. Another object of the present invention is to provide a cleaning method. [Means for solving the problem]

[0007] As a result of extensive investigation, the present inventors have found that the problems can be solved by the following configuration. [1] A cleaning composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and 2-chloro-1,1,1-trifluoroethane. [2] The cleaning composition according to [1], wherein the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and the 2-chloro-1,1,1-trifluoroethane is 80 to 100% by mass, based on the total amount of the cleaning composition. [3] The cleaning composition according to [1] or [2], further comprising at least one selected from the group consisting of tetrafluoroethylene and 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene. [4] The cleaning composition according to any one of [1] to [3], which is used for cleaning an article having dirt containing a (meth)acrylic resin and dust attached thereto. [5] A cleaning method, comprising cleaning an article having dirt containing a (meth)acrylic resin and dust attached thereto, using the cleaning composition according to any one of [1] to [4]. [6] The cleaning method according to [5], wherein the article is at least one selected from the group consisting of textile products, medical instruments, electrical equipment, precision machinery, and optical articles. [Effects of the Invention]

[0008] The cleaning composition of the present invention is excellent in removing (meth)acrylic resin and dust from articles. Furthermore, the present invention can provide a cleaning method using the detergent composition. DETAILED DESCRIPTION OF THE INVENTION

[0009] The terms used in the present invention have the following meanings. (Meth)acrylic resin is a general term for acrylic resin and methacrylic resin.

[0010] The dirt includes (meth)acrylic resin and dust. The dirt may consist of (meth)acrylic resin and dust, or may contain components other than (meth)acrylic resin and dust. Dust may be organic or inorganic, or a combination of both. Examples of organic substances include oils such as processing oil, fluorine oil, silicone oil, and synthetic oil, resins such as polycarbonate, polystyrene, polyethylene, polypropylene, and polytetrafluoroethylene (hereinafter also referred to as PTFE), and organic fibers. Two or more types of organic substances may be included. Examples of inorganic substances include silica, calcium, iron chloride, glass, inorganic fibers, graphite, metals, etc. Two or more types of inorganic substances may be contained. Examples of the composite include the above-mentioned organic and inorganic composite materials. The stain may be in a liquid or solid form. The shape of the solid stain is not particularly limited, and examples thereof include spherical, elliptical, cubic, spindle-shaped, and irregular shapes. In the case of solid spherical dirt, the size of the dirt is not particularly limited, but is, for example, about 0.1 μm to 1 mm, and preferably about 1 μm to 0.1 mm.

[0011] (Detergent composition) The solvent composition of the present invention contains 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (hereinafter also referred to as HFE-347pc-f) and 2-chloro-1,1,1-trifluoroethane (CF3CH2Cl, hereinafter also referred to as HCFC-133a).

[0012] (HFE-347pc-f) HFE-347pc-f has zero ozone depletion potential and low global warming potential. HFE-347pc-f has no flash point. HFE-347pc-f has low surface tension and viscosity. HFE-347pc-f has a boiling point of 56°C.

[0013] HFE-347pc-f can be produced, for example, by a method in which 2,2,2-trifluoroethanol and tetrafluoroethylene are reacted in the presence of an aprotic polar solvent and a catalyst (alkali metal alkoxide or alkali metal hydroxide) (see WO 2004 / 108644).

[0014] Examples of commercially available HFE-347pc-f products include the following: "ASAHIKLIN (registered trademark) AE-3000" (manufactured by AGC Corporation).

[0015] (HCFC-133a) HCFC-133a has a boiling point of 6°C. HCFC-133a can be produced, for example, by a method in which trichloroethylene and hydrogen fluoride are supplied in the presence of a catalyst (chromium oxide) and reacted in the gas phase.

[0016] The cleaning composition of the present invention contains HFE-347pc-f and HCFC-133a, thereby improving the cleaning power of the cleaning composition and providing excellent removability of stains containing (meth)acrylic resin and dust on articles.

[0017] In view of excellent removability of stains containing (meth)acrylic resin and dust on articles, the content of HFE-347pc-f in the cleaning composition of the present invention is preferably 99.9900 to 99.9999 mass%, more preferably 99.9950 to 99.9999 mass%, and even more preferably 99.9975 to 99.9999 mass%, based on the total content of HFE-347pc-f and HCFC-133a.

[0018] In view of excellent removability of stains containing a (meth)acrylic resin and dust on articles, the content of HCFC-133a in the cleaning composition of the present invention is preferably 1 to 100 ppm by mass, more preferably 1 to 50 ppm by mass, and even more preferably 1 to 25 ppm by mass, based on the total content of HFE-347pc-f and HCFC-133a.

[0019] In view of excellent removability of stains containing a (meth)acrylic resin and dust on articles, the total content of HFE-347pc-f and HCFC-133a in the cleaning composition of the present invention is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and even more preferably 95 to 100 mass%, based on the total amount of the cleaning composition.

[0020] In order to impart antifouling properties to articles, the cleaning composition of the present invention preferably further contains at least one selected from the group consisting of tetrafluoroethylene (hereinafter also referred to as TFE) and 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene (C4H2F6O; hereinafter also referred to as specific vinyl ether). Here, antifouling refers to preventing adhesion of stains such as resin materials, dust, adhesives, inks, inorganic components, and organic components to the surface of an article. Here, antifouling properties are evaluated based on the contact angle of the article surface. The contact angle is the angle between the liquid surface and the article surface at the point where a stationary liquid comes into contact with the surface. The larger this angle, the higher the antifouling properties of the article. The change in contact angle before and after cleaning is preferably 3° or more, more preferably 8° or more.

[0021] The specific vinyl ether can be produced, for example, by a method in which 2,2,2-trifluoroethanol and hexafluoropropylene oxide are reacted in the presence of an aqueous potassium hydroxide solution, diethyl ether, and tetra-n-butylammonium bromide to obtain 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid, and then 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid is reacted with sodium hydroxide in the presence of methanol to obtain sodium 2-(2,2,2-trifluoroethoxy)tetrafluoropropionate, and the sodium 2-(2,2,2-trifluoroethoxy)tetrafluoropropionate is reacted by heating to obtain 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene.

[0022] When the cleaning composition of the present invention contains TFE, the content of TFE in the cleaning composition of the present invention is preferably 0.1 to 100 ppm by mass, more preferably 0.2 to 80 ppm by mass, and even more preferably 0.5 to 75 ppm by mass, based on the total content of HFE-347pc-f, HCFC-133a, and TFE, from the viewpoints of improving the contact angle on the surface of an article and imparting antifouling properties to the article.

[0023] When the cleaning composition of the present invention contains TFE, the content of HCFC-133a in the cleaning composition of the present invention is preferably 1 to 100 ppm by mass, more preferably 1 to 50 ppm by mass, and even more preferably 1 to 25 ppm by mass, based on the total content of HFE-347pc-f, HCFC-133a, and TFE.

[0024] When the cleaning composition of the present invention contains TFE, the content of HFE-347pc-f in the cleaning composition of the present invention is preferably 99.98000 to 99.99989 mass%, more preferably 99.98700 to 99.99988 mass%, and even more preferably 99.99000 to 99.99985 mass%, based on the total content of HFE-347pc-f, HCFC-133a, and TFE.

[0025] When the cleaning composition of the present invention contains TFE, the total content of HFE-347pc-f, HCFC-133a and TFE in the cleaning composition of the present invention is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and even more preferably 95 to 100 mass%, based on the total amount of the cleaning composition, in terms of excellent removability of stains containing a (meth)acrylic resin and dust on articles.

[0026] When the cleaning composition of the present invention contains the specific vinyl ether, the content of the specific vinyl ether in the cleaning composition of the present invention is preferably from 1 to 1,000 ppm by mass, more preferably from 5 to 750 ppm by mass, and even more preferably from 10 to 500 ppm by mass, relative to the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether, from the viewpoints of improving the contact angle on the surface of an article and imparting antifouling properties to the article.

[0027] When the cleaning composition of the present invention contains the specific vinyl ether, the content of HCFC-133a in the cleaning composition of the present invention is preferably 1 to 100 ppm by mass, more preferably 1 to 50 ppm by mass, and even more preferably 1 to 25 ppm by mass, based on the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether.

[0028] When the cleaning composition of the present invention contains the specific vinyl ether, the content of HFE-347pc-f in the cleaning composition of the present invention is preferably 99.8900 to 99.9998 mass%, more preferably 99.9200 to 99.9994 mass%, and even more preferably 99.9475 to 99.9989 mass%, based on the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether.

[0029] When the cleaning composition of the present invention contains the specific vinyl ether, the total content of HFE-347pc-f, HCFC-133a and the specific vinyl ether in the cleaning composition of the present invention is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and even more preferably 95 to 100 mass%, based on the total amount of the cleaning composition, in terms of excellent removability of stains containing a (meth)acrylic resin and dust on articles.

[0030] The cleaning composition of the present invention may contain a component other than HFE-347pc-f, HCFC-133a, TFE, and the specific vinyl ether (hereinafter, also referred to as component (A)) as long as the effects of the present invention are not impaired.

[0031] (Component (A)) Component (A) is a component that is soluble in HFE-347pc-f and HCFC-133a, and when the cleaning composition of the present invention contains TFE and the specific vinyl ether, it is a component that is also soluble in TFE and the specific vinyl ether. Component (A) is appropriately selected depending on various purposes, such as increasing solubility or adjusting the evaporation rate. Examples of component (A) include hydrocarbons soluble in HFE-347pc-f, HCFC-133a, TFE, and specific vinyl ethers, alcohols, ethers other than the specific vinyl ethers, ketones, esters, amines, chlorocarbons, hydrofluorocarbons (hereinafter also referred to as HFCs), perfluorocarbons other than TFE (hereinafter also referred to as PFCs), hydrochlorofluorocarbons other than HCFC-133a (hereinafter also referred to as HCFCs), etc. These components may be contained alone or in combination of two or more.

[0032] The hydrocarbon may be linear or cyclic, and may be saturated or unsaturated. Preferred hydrocarbons are heptane, hexane, octane, nonane, cyclobutane, cyclopentane, cyclohexane, 1-butene, 2-butene, 2-methylpropene, 1-pentene, 2-pentene, 1-butyne, 2-butyne, pentyne, cyclopropene, cyclobutene, cyclopentene, and cyclohexene.

[0033] The alcohol may be either a chain or cyclic alcohol, and may be either a saturated or unsaturated alcohol. As the alcohol, methanol, ethanol, normal propyl alcohol, isopropyl alcohol, normal butyl alcohol, isobutyl alcohol, sec-butyl alcohol, and tert-butyl alcohol are preferred.

[0034] The ether other than the specific vinyl ether may be linear or cyclic, and may be a saturated or unsaturated ether. As the ether other than the specific vinyl ether, dimethyl ether, ethyl methyl ether, diethyl ether, diisopropyl ether, methyl tert-butyl ether, and tetrafluoroethanol are preferred.

[0035] The ketone may be a chain or cyclic ketone, and may be a saturated or unsaturated ketone. As the ketone, acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone are preferred.

[0036] The ester may be linear or cyclic, and may be a saturated or unsaturated ester. The ester is preferably methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl butyrate, ethyl butyrate, or γ-butyrolactone.

[0037] As the amine, monomethylamine, dimethylamine, and trimethylamine are preferred.

[0038] The chlorocarbon may be either chain or cyclic, and may be either saturated or unsaturated. Preferred chlorocarbons are dichloromethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,2-trichloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, trichloroethylene, tetrachloroethylene, and 1,2-dichloropropane.

[0039] Preferred HFCs are 1,1,1,3,3-pentafluorobutane, 1,1,1,2,2,3,4,5,5,5-decafluoropentane, 1,1,2,2,3,3,4-heptafluorocyclopentane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane, and 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane.

[0040] As PFCs other than TFE, decafluorobutane, dodecafluoropentane, tetradecafluorohexane, hexadecafluoroheptane, and octadecafluorooctane are preferred.

[0041] As HCFCs other than HCFC-133a, dichloropentafluoropropane, 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane, and 2,2-dichloro-1,1,1-trifluoroethane are preferred.

[0042] When the cleaning composition of the present invention contains component (A), the content thereof is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, based on the total amount of the cleaning composition.

[0043] The detergent composition of the present invention is preferably used for cleaning articles having dirt containing a (meth)acrylic resin and dust attached thereto.

[0044] (Cleaning method) In the cleaning method of the present invention, the (meth)acrylic resin and dirt adhering to an article are cleaned using the detergent composition of the present invention. The (meth)acrylic resin may adhere to an article when an adhesive containing the (meth)acrylic resin is brought into contact with the article, or when ink containing the (meth)acrylic resin is applied to the article. Specific examples include metal parts, resin parts, inkjet printer heads and nozzle parts, etc., to which an acrylic adhesive containing a UV-curable resin or ink containing a pigment and an acrylic resin is adhered and fixed.

[0045] The cleaning composition of the present invention dissolves and removes the (meth)acrylic resin on an article, and also removes stains containing the (meth)acrylic resin and dust.

[0046] A specific cleaning method may involve contacting the surface of an article with the detergent composition of the present invention. Although not particularly limited, methods such as hand wiping, immersion, spraying, shaking, ultrasonic cleaning, steam cleaning, or a combination thereof may be employed.

[0047] Examples of materials for articles to which the cleaning composition of the present invention can be applied include metals, resins other than (meth)acrylic resins, elastomers, glass, and ceramics. Furthermore, the article may be made of a composite material containing two or more of these materials. Examples of composite materials include laminates of metals and resins other than (meth)acrylic resins. Specific examples of articles to which the cleaning method of the present invention can be applied include textiles, medical instruments, electrical equipment, precision machinery, optical equipment, transportation equipment, and parts thereof. Specific examples of electrical equipment, precision machinery, optical equipment, transportation equipment, and parts thereof include electric wires, fuses, current controllers, transformers, electric heaters, capacitors, resistors such as thermistors, transformers, inductors, switches, connectors, acoustic components such as speakers, optical and thermal sensors, actuators such as motors, power supply components, quartz crystal resonators, quartz oscillators, filters, antenna components, printed circuit boards on which these are mounted, relays, optical lenses, glass substrates, bearings, gears, chains, and brakes. [Example]

[0048] The present invention will be described in detail below with reference to examples. The present invention is not limited to these examples. Examples 2 to 6 are examples of the cleaning composition of the present invention, and Examples 1 and 7 are comparative examples.

[0049] (HFE-347pc-f) For the HFE-347pc-f, we purchased the AE-3000 (manufactured by AGC).

[0050] (Preparation of HCFC-133a) A chromium oxide catalyst (50 mL) was packed into a U-shaped Inconel 600 reactor tube with an inner diameter of 1 / 2 inch and a length of 100 cm. The temperature was raised to 300 °C while flowing nitrogen gas (150 NmL / min). While maintaining atmospheric pressure inside the reactor tube, the catalyst was dried until the moisture content of the crude gas passing through the reactor was 20 ppm by volume or less. After the catalyst drying was completed, the catalyst was activated by fluorination at 300 °C while flowing a mixed gas of hydrogen fluoride (68.3 NmL / min) and nitrogen (34.1 NmL / min). The reactor tube was heated to 250 °C, and gasified trichloroethylene (9.30 NmL / min) and hydrogen fluoride (93.1 NmL / min) were supplied and reacted. The crude reaction gas was passed through a 10% by mass potassium hydroxide aqueous solution. After 30 hours, the organic layer separated in the 10% by mass potassium hydroxide aqueous solution was collected. The recovered organic layer was purified by distillation to obtain HCFC-133a (31.0 g) with a purity of 100% by mass.

[0051] (Preparation of specific vinyl ethers) A 2 L stainless steel reactor equipped with a stirrer and lined with fluororesin was charged with 35% by weight potassium hydroxide aqueous solution (480 g), diethyl ether (400 mL), and tetra-n-butylammonium bromide (12.2 g) and stirred. 2,2,2-trifluoroethanol (161 g) was slowly added dropwise while cooling in an ice bath to prevent the temperature of the reactor from rising. After the dropwise addition was completed, hexafluoropropylene oxide (133 g) was added while stirring, maintaining the temperature of the reactor below 30°C. After stirring for 1 hour, 35% hydrochloric acid was added until the pH reached 1. After stirring for another hour, the organic layer separated from the aqueous layer and was recovered. The recovered organic layer was purified by distillation to yield 148 g of 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid with a purity of 100% by weight. Methanol (100 g) and sodium hydroxide pellets (26.8 g) were placed in a 1 L glass reactor equipped with a stirrer and stirring was initiated. A mixed solution of 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid (148 g) and methanol (100 g) was slowly added dropwise to the reactor while cooling in an ice bath to prevent the temperature of the reactor from rising. After the addition was complete, the reactor was heated to 60 °C and the methanol was distilled off under a reduced pressure of 2–3 torr. The reactor was then further heated to 100 °C and the residue was distilled off under a reduced pressure of 2–3 torr to obtain a residue. The reactor was then heated to 250 °C, and the resulting volatile substances were collected in a cold trap at −78 °C. The condensate was purified by distillation to obtain 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene (73.2 g) with a purity of 100% by mass.

[0052] (Preparation of TFE) Zinc powder (164 g), zinc chloride (10 g), ethanol (500 g), dibromotetrafluoroethane (649 g), and tetra-n-butylammonium bromide (10 g) were placed in a 2 L Hastelloy reactor equipped with a stirrer and stirred. The reactor was heated to 65°C while stirring for 3 hours, and the generated gas was collected in a stainless steel vessel cooled to -78°C, yielding 160 g of TFE with a purity of 100% by mass.

[0053] (Preparation of Nonafluorobutoxymethane) Nonafluorobutoxymethane (hereinafter also referred to as "HFE-449s1") refers to a compound represented by C4F9OCH3. As HFE-449s1, we purchased "Novec7100" (manufactured by 3M), a mixture of 1-methoxy-2-trifluoromethyl-1,1,2,3,3,3-hexafluoropropane and 1-methoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane.

[0054] (Preparation of Cleaning Composition) HFE-347pc-f, HCFC-133a, 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene, TFE, and HFE-449s1 were mixed in the mass ratios shown in Table 1 to prepare the cleaning compositions of Examples 1 to 7.

[0055] (Preparation of test specimens) 1.737 g of acrylic resin was added to 10 g of trichloroethylene, stirred, and dissolved to prepare an acrylic resin solution for use in the test. A cleaned 50 mm x 50 mm glass substrate was used for the test. The contact angle of water on the glass substrate was 8°. One g of the prepared acrylic resin solution was applied to one side of a glass substrate, and graphite powder (special grade reagent, Fujifilm Wako Pure Chemical Industries, Ltd.) and PTFE powder (reagent, Fujifilm Wako Pure Chemical Industries, Ltd.) were sprinkled on the surface as dust and allowed to dry overnight to prepare a test piece. The total mass (amount of dirt) of the applied acrylic resin, graphite powder, and PTFE powder was calculated from the difference in mass before and after application.

[0056] (Cleaning test and particle residue evaluation) This example was tested using two 1-L beakers. 800 ml of each of the cleaning compositions from Examples 1 to 7 was placed in a 1-L beaker and placed in the water bath of an ultrasonic cleaner (Sharp Ultrasonic Cleaner UH-206H, 35 kHz, 200 W output) at 45°C. 300 ml of each of the cleaning compositions from Examples 1 to 7 was placed in a 1-L beaker fitted with a cooling tube on top, and the 1-L beaker was placed on a hot plate and heated to generate solvent vapor. In this example, one prepared test piece was used, and ultrasonic immersion cleaning was performed for 3 minutes and steam cleaning for 3 minutes using this testing equipment. The mass of the test piece after cleaning was measured, and the state of acrylic resin and particle residue on the surface was visually observed before and after the test using a 100x digital microscope (Hirox). The cleaning rate and acrylic resin and particle residue were evaluated according to the following criteria. The cleaning rates below are calculated by the following formula: The higher the cleaning rates below, the higher the removability of the (meth)acrylic resin, graphite powder, and PTFE powder. Cleaning rate (%) = 100 - (mass of test piece before cleaning - mass of test piece after cleaning) / (mass of test piece before cleaning - mass of test piece before preparation) x 100 Cleaning Rate Rating: A: Over 70%, B: Between 50% and 70%, C: Less than 50% Cleaning evaluation based on acrylic resin and particle appearance: AA: (Almost) no residual acrylic resin or particles can be detected, A: Significant reduction in acrylic resin and particles, B: Reduced acrylic resin and particles but still abundant, C: No difference from the initial state.

[0057] (Measurement of water contact angle on glass substrate) The cleaning test was carried out in the same manner using only the glass test piece, and the water contact angle of the glass substrate was measured before and after the test using an automatic contact angle meter (DY-300 manufactured by Kyowa Interface Science Co., Ltd.). The water contact angle before and after the test (contact angle after the test - contact angle before the test) was evaluated according to the following criteria. Contact angle (change from initial value) A: 8° or more, B: 3° or more but less than 8°, C: less than 3°

[0058] In Table 1, the column "HEF-347pc-f (mass %)" for Examples 1 to 4 indicates the content (mass %) of HEF-347pc-f relative to the total content of HFE-347pc-f and HCFC-133a. In Table 1, the column "HCFC-133a (ppm by mass)" for Examples 1 to 4 indicates the content (ppm by mass) of HCFC-133a relative to the total content of HFE-347pc-f and HCFC-133a. In Table 1, the column "HEF-347pc-f (mass%)" for Example 5 shows the content (mass%) of HEF-347pc-f relative to the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether. In Table 1, the column "HCFC-133a (ppm by mass)" for Example 5 indicates the content (ppm by mass) of HCFC-133a relative to the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether. In Table 1, the column "Specific vinyl ether (ppm by mass)" for Example 5 indicates the content (ppm by mass) of the specific vinyl ether relative to the total content of HFE-347pc-f, HCFC-133a, and the specific vinyl ether. In Table 1, the column "HEF-347pc-f (mass %)" for Example 6 shows the content (mass %) of HEF-347pc-f relative to the total content of HFE-347pc-f, HCFC-133a, and TFE. In Table 1, the column "HCFC-133a (ppm by mass)" for Example 6 indicates the content (ppm by mass) of HCFC-133a relative to the total content of HFE-347pc-f, HCFC-133a, and TFE. In Table 1, the column "TFE (ppm by mass)" for Example 6 indicates the content (ppm by mass) of TFE relative to the total content of HFE-347pc-f, HCFC-133a, and TFE. In Table 1, the column "HFE-449s1 (mass %)" indicates the content (mass %) of HFE-449s1 relative to the total amount of the detergent composition.

[0059] [Table 1]

[0060] Examples 2 to 6, in which the detergent compositions contain HFE-347pc-f and HCFC-133a, have a cleaning rate and appearance rating of AA or A, and are excellent in removing (meth)acrylic resin from articles as well as in removing dirt particles coexisting with the (meth)acrylic resin. In Examples 5 and 6, in which the detergent composition further contains TFE and a specific vinyl ether, the contact angle is A, and the antifouling property after cleaning is improved.

Claims

1. A cleaning composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and 2-chloro-1,1,1-trifluoroethane, the content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether is 99.9900 to 99.9999 mass% based on the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and the 2-chloro-1,1,1-trifluoroethane, the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and the 2-chloro-1,1,1-trifluoroethane is 80 to 100 mass % based on the total amount of the cleaning composition.

2. A cleaning composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, 2-chloro-1,1,1-trifluoroethane, and tetrafluoroethylene, the content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether is 99.98000 to 99.99989 mass% based on the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, the 2-chloro-1,1,1-trifluoroethane, and the tetrafluoroethylene; the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, the 2-chloro-1,1,1-trifluoroethane, and the tetrafluoroethylene is 80 to 100 mass% based on the total amount of the cleaning composition.

3. A cleaning composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, 2-chloro-1,1,1-trifluoroethane, and 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene, the content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether is 99.8900 to 99.9998 mass% based on the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, the 2-chloro-1,1,1-trifluoroethane, and the 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene; the total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, the 2-chloro-1,1,1-trifluoroethane, and the 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene is 80 to 100 mass% based on the total amount of the cleaning composition.

4. The cleaning composition according to any one of claims 1 to 3, which is used for cleaning an article having soiling containing a (meth)acrylic resin and dust attached thereto.

5. A cleaning method comprising cleaning an article having soiling containing a (meth)acrylic resin and dust adhered thereto with the detergent composition according to any one of claims 1 to 4.

6. 6. The cleaning method according to claim 5, wherein the article is at least one selected from the group consisting of textile products, medical instruments, electrical devices, precision machinery, and optical articles.

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