Solvent composition

Abstract

To provide a solvent composition exhibiting excellent solubility to fluorine oils to be alternatives of solvent compositions including 1,1,1,3,3-pentafluorobutane and hydrofluoroether.SOLUTION: The present invention contains (A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, and (B) hydrofluoroether compounds represented by the general formula (1): R1-O-R2 (where R1 is an alkyl group of 3 to 6 carbon atoms substituted with at least one fluorine atom, and R2 is an alkyl group of 1 to 4 carbon atoms or an alkyl group of 3 to 6 carbon atoms substituted with at least one fluorine atom). When a total of component (A) and component (B) is 100 pts.wt, component (A) is 10.00 to 70.00 pts.wt., and pertains to a solvent composition for cleaning objects coated with fluorine oil, as well as solvents for dissolving fluorine oil using the solvent composition, cleaning agents for cleaning objects coated with fluorine oil, and coatings containing fluorine oil.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a solvent composition. [Background technology]

[0002] Fluorine oil (including grease-like fluorine oil) has low volatility and high heat resistance, and is therefore used in applications such as parts such as vacuum pumps in semiconductor equipment and as coatings to improve the insulation of electromagnetic switches.

[0003] In addition, fluorine oils are used for applications such as lubricants, and cleaning agents are used to remove the fluorine oils from parts to which they have been attached. Patent Document 1 discloses a solvent composition containing 1,1,1,3,3-pentafluorobutane and a hydrofluoroether. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-121948 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, 1,1,1,3,3-pentafluorobutane has been targeted for reduction in the Gigabit Amendment to the Montreal Protocol due to its high global warming potential, and is considered a chemical substance whose use is undesirable due to its environmental impact.

[0006] In recent years, hydrofluoroolefins, such as cis-1-chloro-3,3,3-trifluoropropene, which has a low global warming potential, have been used as industrial cleaning agents with excellent drying and general degreasing properties. However, hydrofluoroolefins are not soluble in fluorine oils or fluorine greases.

[0007] An object of the present invention is to provide a solvent composition that exhibits excellent solubility in fluorine oil and can be used as an alternative to a solvent composition containing 1,1,1,3,3-pentafluorobutane and a hydrofluoroether. [Means for solving the problem]

[0008] The present invention has the following configuration. [1] (A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, and (1) (B) General formula (1): R 1 -OR 2 (1) (In the formula, R 1 is an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom, and R 2 is an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom, The amount of the component (A) is 10.00 to 70.00 parts by weight when the total amount of the components (A) and (B) is 100 parts by weight. Solvent composition. [2] The solvent composition according to [1], further comprising, as an optional component, only one or more additives selected from the group consisting of (C) a stabilizer, an ultraviolet absorber, an antioxidant, and a rust inhibitor, wherein the total amount of the components (A) and (B) is 90.00 parts by weight or more and 100 parts by weight or less when the total amount of the solvent composition is 100 parts by weight. [3] The solvent composition according to [1] or [2], wherein the component (B) is one or more compounds selected from the group consisting of methyl nonafluorobutyl ether and methyl nonafluoroisobutyl ether. [4] A dissolving agent for fluorinated oil, which uses the solvent composition according to any one of [1] to [3]. [5] A cleaning agent for cleaning an object having fluorinated oil attached thereto, which uses the solvent composition according to any one of [1] to [3]. [6] A fluorinated oil coating agent comprising the solvent composition according to any one of [1] to [3] and a fluorinated oil. Effect of the Invention

[0009] The present invention provides a solvent composition that exhibits excellent solubility in fluorine oil and can be used as an alternative to a solvent composition containing 1,1,1,3,3-pentafluorobutane and a hydrofluoroether. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Definition of terms) "(A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether" may be referred to as "(A)" or "component (A)." The same applies to other components. Regarding numerical ranges, "to" means that both ends of the range are included. That is, "10.00 to 70.00 parts by weight" means "10.00 parts by weight or more and 70.00 parts by weight or less." Additionally, "or less" means "the same as or less than," and "or more" means "the same as or greater than."

[0011] [Solvent composition] The solvent composition comprises (A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and (B) a compound represented by the general formula (1): R 1 -OR 2 (In the formula, R 1 is an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom, and R 2 is an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom), and the amount of component (A) is 10.00 to 70.00 parts by weight when the total amount of components (A) and (B) is 100 parts by weight.

[0012] The present inventors have conducted extensive research to solve the above problems, and have found that a solvent composition mainly composed of a specific combination of hydrofluoroethers has excellent solubility in fluorine oil. In addition, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, which is component (A), is not subject to the restrictions of the Kigali Amendment of the Montreal Protocol. Therefore, a solvent composition containing components (A) and (B) can be used as a substitute for a solvent composition using 1,1,1,3,3-pentafluorobutane.

[0013] [(A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether] The component (A) is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether. The component (A) is a hydrofluoroether compound also called 1,1,2,2-tetrafluoro-1-(2,2,2-trifluoroethoxy)ethane, HFE-347pc-f. An example of a commercially available product of the component (A) is Asahiklin AE-3000 (manufactured by AGC Corporation).

[0014] [(B) Hydrofluoroether compound] The component (B) is represented by the general formula (1): R 1 -OR 2 (1) (where R 1 is an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom, and R 2 is an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom.

[0015] The alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom may be linear or branched, and is preferably represented by the following formula (2): C n H m F (2n-m+1) - (2) (In the formula, n is an integer from 3 to 6; m is 0 or an integer from 1 to 6; m≦n) and particularly preferably a group represented by the following formula (3): C n F (2n+1) - (3) (wherein n is an integer of 3 to 6). It is a perfluoroalkyl group represented by the formula:

[0016] Specific examples of alkyl groups having 3 to 6 carbon atoms substituted with at least one fluorine atom include hydrofluoroalkyl groups such as -C3F6H, -C3F4H3, -CH(CH3)CF2CHFCF3, and -CF2CHFCF3, and perfluoroalkyl groups such as -C3F7, -CF(CF3)CF3, -C4F9, -CF(CF3)CF2CF3, and -CF(C2F5)CF(CF3)CF3.

[0017] Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a t-butyl group, and preferred are a methyl group and an ethyl group.

[0018] Examples of component (B) include methyl perfluoroether, 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, and 1,1,1,2,3,3-hexafluoro-4-(1,1,2,3,3,3-hexafluoropropoxy)-pentane.

[0019] Component (B) is preferably methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, a mixture of methyl nonafluorobutyl ether and methyl nonafluoroisobutyl ether, or a mixture of ethyl nonafluorobutyl ether and ethyl nonafluoroisobutyl ether.

[0020] When the component (B) is a mixture of two or more hydrofluoroether compounds, the ratio of the contents of these components may be any. For example, when the component (B) is a mixture of methyl perfluorobutyl ether and methyl perfluoroisobutyl ether, the content of methyl perfluorobutyl ether is preferably 5 to 95% by weight, more preferably 50 to 80% by weight, based on the total weight of the mixture of methyl perfluorobutyl ether and methyl perfluoroisobutyl ether.

[0021] Commercially available hydrofluoroether products include the Novec HFE series, such as HFE7000, HFE7100, HFE7200, HFE7300, and HFE7600, manufactured by Sumitomo 3M.

[0022] [Components other than (A) and (B)] The solvent composition may contain an additive (C) within a range that does not impair the effects of the present invention. The additive (C) may be one or more selected from the group consisting of stabilizers, ultraviolet absorbers, antioxidants, and rust inhibitors.

[0023] The stabilizers include nitroalkane stabilizers, epoxide stabilizers, and ether stabilizers. The nitroalkane stabilizers include, for example, nitromethane, nitroethane, 1-nitropropane, and 2-nitropropane. The epoxide stabilizers include, for example, 1,2-butylene oxide, propylene oxide, and glycidol. The ether stabilizers include, for example, 1,3-dioxolane.

[0024] 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.

[0025] Rust inhibitors include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, aminomethylpropanolamine, aminoethylethanolamine, cyclohexylamine, dicyclohexylamine, and N,N-bis(2-hydroxyethyl)-N-cyclohexylamine.

[0026] The additives (C) other than the above-mentioned components can be appropriately selected from components commonly used in the field of solvent compositions using fluorine-based solvents. Each of the (C) additives may be one type or a combination of two or more types.

[0027] [Composition of Solvent Composition] In the solvent composition, when the total of the (A) component and the (B) component is 100 parts by weight, the (A) component is 10.00 to 70.00 parts by weight. When the total of the (A) component and the (B) component is 100 parts by weight, when the (A) component is less than 10.00 parts by weight, the solubility in fluorine oil is poor. In addition, when the content of the (A) component is within the above range, when the solvent composition is used as a cleaning agent, the penetration power into the object to be cleaned to which the fluorine oil is attached is high, which is good in that the cleaning time can be shortened. In addition, after cleaning, no cleaning stains remain on the object to be cleaned, and the drying property of the object to be cleaned is excellent, the cleaning time is shortened, and an additional rinsing step may not be required. In addition, when the content of the (A) component is within the above range, when the solvent composition is used as a coating agent for fluorine oil, the spreadability of the coating agent on the substrate to which it is applied is high, which is good in that the time until the coating is formed can be shortened.

[0028] In addition, when the total of the solvent composition is 100 parts by weight, the total of the (A) component and the (B) component is preferably 90.00 parts by weight or more and 100 parts by weight or less, and particularly preferably 95.00 parts by weight or more and 100 parts by weight or less. Here, the remainder is the (C) component. Therefore, the solvent composition further contains only one or more additives selected from the group consisting of (C) stabilizers, ultraviolet absorbers, antioxidants, and rust inhibitors as optional components, and when the total of the solvent composition is 100 parts by weight, the total of the (A) component and the (B) component is preferably 90.00 parts by weight or more and 100 parts by weight or less.

[0029] [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.

[0030] [Uses of the solvent composition] Since the solvent composition has excellent solubility in fluorine oil, the solvent composition can be used as a dissolving agent for fluorine oil and a cleaning agent for cleaning objects to which fluorine oil is attached (also referred to as a "fluorine oil cleaning agent"). In addition, the solvent composition and a composition containing fluorine oil can be used as a coating agent for fluorine oil (also simply referred to as a "coating agent").

[0031] [Fluorine oil] Fluorine oil is a substance in which some or all of the hydrogen atoms in a polyalkyl ether compound are replaced with fluorine, and may contain further atoms such as halogens such as chlorine and bromine, phosphorus, sulfur, and nitrogen. Fluorine oil is liquid or grease-like at room temperature (e.g., -10°C to 50°C, particularly 25°C). Fluorine oil is used as cutting oil, press oil, drawing oil, heat treatment oil, rust preventive oil, lubricating oil, etc.

[0032] The fluorinated oil may be, for example, a fluorinated oil represented by the general formula (4): CF3CF2CF2O-(CF(CF3)CF2O) x-CF2CF3(4) (wherein x is an integer of 1 or more), General formula (5): HOCH2CF2O-(CF2CF2O) p -(CF2O) q -CF2CH2OH (5) (wherein p and q are each independently an integer of 1 or greater); Or, general formula (6): F-(CF2CF2CF2O) y -CF2CF2O-CH2OH (6) (wherein y is an integer of 1 or more). It has the structure shown below.

[0033] Examples of commercially available fluorine oils include Fomblin Y-LVAC, Y-HVAC, Y04, and YR manufactured by Solvay Solexis; BARRIERTA J100 fluid, BARRIERTA J25 fluid, BARRIERTA J400 fluid, BARRIERTA J25V, BARRIERTA SJ07, BARRIERTA SJ15, and BARRIERTA SJ30 manufactured by NOK Kluber; Krytox 1506, Krytox 1514, and Krytox 1525 manufactured by DuPont Co., Ltd.; and DEMNUM S-20 manufactured by Daikin Industries, Ltd. The solvent composition has a particularly excellent cleaning effect on perfluoroalkyl ether oils represented by the general formulas (4) and (5) among fluorine oils.

[0034] [Fluorine oil dissolving agent] The solvent composition is used as a fluorine oil dissolving agent. The amount of fluorine oil dissolved is not particularly limited as long as it is equal to or less than the saturated dissolving amount. In addition, as a method of using the fluorine oil dissolving agent, the conditions usually used as a fluorine oil dissolving agent can be appropriately selected.

[0035] The composition used as a dissolving agent for fluorine oil includes a solvent composition and fluorine oil. Therefore, the composition used as a dissolving agent for fluorine oil may be used as a coating agent for fluorine oil.

[0036] [Cleaning agent for cleaning objects with fluorine oil on them] The solvent composition is used as a cleaning agent for cleaning an object to which fluorine oil is attached. In this specification, "cleaning" refers to removing fluorine oil from an object to which fluorine oil is attached. Therefore, a specific use of the fluorine oil cleaning agent is a cleaning agent for an object to be cleaned that is contaminated with fluorine oil. Examples of objects to be cleaned that are contaminated with fluorine oil include objects to be cleaned that are contaminated with oil selected from cutting oil, press oil, drawing oil, heat treatment oil, rust preventive oil, and lubricating oil. In addition, when the solvent composition is composed of only the (A) component and the (B) component, the fluorine oil cleaning agent can also be used as a rinse cleaning agent or a finish cleaning agent for objects to be cleaned that have been cleaned with various cleaning agents.

[0037] The objects to be cleaned using a cleaning agent for removing fluorine oil include various parts to which fluorine oil is attached (i.e., various parts contaminated by fluorine oil). Such parts include electric / electronic parts, optical parts, automobile parts, and machine parts. The objects to be cleaned may be objects to be cleaned for daily maintenance, that is, objects to be cleaned once or twice a day, or objects to be cleaned for overhaul, that is, objects to be cleaned once every six months to a year.

[0038] Examples of electric and electronic components include wiring boards such as printed wiring boards and ceramic wiring boards. Examples of optical components include camera lenses and camera housings. Examples of automobile parts include metal parts used for automobile shafts, frame parts, exterior parts, etc. Examples of mechanical parts include bearings for vacuum pumps, semiconductor manufacturing equipment, cleaning equipment, motors, fans, etc., and bearings for precision machinery parts such as watches, etc.

[0039] These parts are made of metal or resin, and their shapes are not limited to plate-like members, but may be pipe-like members or long members with circular or rectangular cross sections, or members with other complex shapes. Note that the solvent composition may have excellent drying properties after cleaning, so that dust and dirt attached to printed circuit boards and various resin parts can also be removed.

[0040] [Cleaning method] The cleaning method using a fluorine oil cleaning agent includes a step of contacting the fluorine oil cleaning agent with an object to be cleaned to which the fluorine oil is attached. The method for contacting the fluorine oil cleaning agent with the object to be cleaned to which the fluorine oil is attached is not particularly limited, and may include the steps of immersion cleaning, shower cleaning, ultrasonic cleaning, wiping cleaning, barrel cleaning, spray cleaning, pouring cleaning, bubbling cleaning, steam cleaning, or a combination thereof. The specific conditions for these are not particularly limited, and can be appropriately set from known conditions.

[0041] The cleaning time, which corresponds to the contact time between the fluorine oil cleaning agent and the object to be cleaned, is not particularly limited as long as it is a time that can clean and remove the fluorine oil attached to the object to be cleaned. For example, the cleaning time may be from 1 second to 2 hours.

[0042] The washing temperature is preferably 20 to 120° C. Within such a temperature range, treatment at a higher temperature can improve the washing effect.

[0043] [Fluoro oil coating agent] The fluorine oil coating agent includes a solvent composition and a fluorine oil. The solvent composition has excellent solubility of the fluorine oil and is volatile. Therefore, the solvent composition can be used as a solvent in the fluorine oil coating agent. The viscosity of the fluorine oil coating agent can be significantly lower than the viscosity of the fluorine oil contained therein. Therefore, when the fluorine oil coating agent is applied, more uniform wetting occurs than when the fluorine oil is applied alone. As a result, even if the fluorine oil has a high viscosity, it can be applied thinly and uniformly. When the coating agent is applied, a mixture of the solvent composition and the fluorine oil adheres to the surface of the substrate. And, since the fluorine oil is non-volatile while the solvent composition is highly volatile, only the fluorine oil remains as a coating on the surface of the substrate. As a result, a fluorine oil coating is obtained.

[0044] The content of the fluorine oil in the coating agent is arbitrary as long as the solvent composition can dissolve the fluorine oil and a coating having a desired thickness is formed. In the coating agent, the content of the fluorine oil may be 0.1 to 15 parts by weight, or may be 0.5 to 10 parts by weight, relative to 100 parts by weight of the solvent composition.

[0045] A method for forming a fluorinated oil coating using a coating agent includes a step of applying the coating agent to a substrate on which the coating is to be formed, and a step of volatilizing a solvent composition component of the coating agent from the substrate on which the coating agent has been applied.

[0046] Methods for applying the composition to the substrate include brush coating, immersion coating, spray coating, hand wiping coating with a cloth soaked in the composition, etc. The type of substrate is not particularly limited, and examples thereof include inorganic (glass, metal, etc.), organic (resin, fiber, etc.), and combinations thereof.

[0047] From the viewpoint of uniformity of the coating, the temperature of the coating agent when applied is preferably equal to or lower than the boiling point of the coating agent, and particularly preferably room temperature (for example, −10 to 40° C., and preferably 23° C.). Moreover, the temperature of the substrate (particularly the substrate surface) when applied is preferably equal to or lower than the boiling point of the coating agent, and from the viewpoint of drying property, is particularly preferably equal to or higher than room temperature and lower than the boiling point of the coating agent.

[0048] By applying the coating agent to the substrate on which the coating is to be formed, a substrate having a coating agent of fluorine oil attached thereto is obtained.

[0049] A method for volatilizing the solvent composition component of the coating agent from the substrate to which the coating agent is applied includes a drying method. Specific drying means include drying by leaving or standing the substrate, drying by heating in a thermostatic device, drying under reduced pressure in a reduced pressure container, etc. The temperature and time for leaving the substrate are not particularly limited as long as they are the temperature and time at which the solvent composition volatilizes.

[0050] By leaving the substrate, the highly volatile solvent composition volatilizes, and only the less volatile fluorinated oil remains as a coating on the substrate surface. By the step of volatilizing the solvent composition components of the coating agent from the substrate to which the coating agent has been applied, a substrate having a coating of the fluorinated oil formed thereon can be obtained.

[0051] Applications of the coating agent include water-repellent coating for automobile window glass, water-repellent coating spray for shoes and clothes, lubricant application for providing lubricity to machine drive parts, coating applications for preventing deterioration of resins, oxidation prevention applications for metal surfaces, etc. In addition, in order to remove the coating formed by the coating agent, the above-mentioned fluorine oil cleaning agent may be used in some cases. EXAMPLES

[0052] 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.

[0053] The solvent compositions of Examples 1 to 16 and Comparative Examples 1 to 6 were prepared by mixing the components according to the compositions shown in Tables 1 and 2.

[0054] [Table 1]

[0055] [Table 2]

[0056] HFE-347pc-f: 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (ASAHIKLIN AE-3000 (AGC Corporation)) HFE-7100: A mixture of methyl nonafluorobutyl ether and methyl nonafluoroisobutyl ether (manufactured by Sumitomo 3M) Methyl nonafluoroisobutyl ether (Hangzhou Fanda Chemical Co., Ltd.) Epoxide stabilizer: 1,2-butylene oxide (Tokyo Chemical Industry Co., Ltd.)

[0057] Test Example 1 Dissolution of fluorinated oil As the fluorine oil, Barrierta J100 Fluid (Fluorine Oil (1)) manufactured by NOK and Fomblin Y-LVAC (Fluorine Oil (2)) manufactured by Solvay Solexis were used. 5 g of each of the solvent compositions of Examples 1 to 16 and Comparative Examples 1 to 6 was placed in a test tube. 1 g of fluorine oil was added thereto, and the mixture was thoroughly stirred and then allowed to stand for 1 hour. After standing, the mixture was visually inspected for turbidity and the occurrence of separation. The results of Test Example 1 are shown in Tables 3 and 4.

[0058] [Table 3]

[0059] [Table 4]

[0060] ○: No turbidity or separation of the liquid is observed ×: The liquid becomes cloudy or separates.

[0061] As seen from Tables 3 and 4, the solvent compositions of Examples 1 to 16 had excellent solubility in fluorinated oil. Therefore, according to the results of Test Example 1, the solvent compositions of the Examples can be used as a dissolving agent for fluorinated oil. On the other hand, the solvent compositions of Comparative Examples 1 to 6 had poor solubility in fluorinated oil.

[0062] Test Example 2 Coating test As the fluorine oil, BARRIERTA J100 FLUID (fluorine oil (1)) manufactured by NOK was used. The solvent compositions of Examples 3 and 11 were used as solvents for the coating agents.

[0063] [Example 17] A coating agent was prepared by placing 10 g of fluorine oil (1) in a 100 ml beaker, adding 100 g of the solvent composition of Example 3, and stirring until uniformly mixed. A smooth SUS plate (1 cm x 3 cm, 1.5 mm thick) was immersed in the coating agent for 10 seconds, slowly removed, and then allowed to dry naturally at an ambient temperature of 23°C for 1 hour. A thin and uniform fluorine oil film was formed on the surface of the SUS plate after drying.

[0064] [Example 18] The same test as in Example 17 was carried out using the solvent composition of Example 11 instead of the solvent composition of Example 3. A thin and uniform film of fluorinated oil was formed on the surface of the SUS plate after drying.

[0065] According to the results of Test Example 2, the solvent composition and the composition containing the fluorinated oil of the example can be used as a coating agent for the fluorinated oil.

[0066] Test Example 3 Cleaning test As the fluorine oil, BARRIERTA J100 FLUID (fluorine oil (1)) manufactured by NOK was used. In addition, the solvent compositions of Examples 3 and 11 were used as cleaning agents.

[0067] [Example 19] 0.1 g of fluorine oil (1) was dropped onto a smooth SUS plate (1 cm x 3 cm, 1.5 mm thick). 100 g of the cleaning agent was placed in a 100 ml beaker, and the SUS plate was immersed in it and then cleaned by shaking for 4 minutes. After cleaning, the SUS plate was slowly removed and left to dry naturally for 1 hour. After drying, the fluorine oil on the surface of the SUS plate had been removed to the point where it could not be seen with the naked eye.

[0068] [Example 20] The same test as in Example 19 was carried out using the solvent composition of Example 11 instead of the solvent composition of Example 3. The fluorine oil on the surface of the SUS plate after drying was removed to an extent that it could not be visually confirmed.

[0069] According to the results of Test Example 3, the cleaning agent using the solvent composition of the Example can be used as a cleaning agent for removing fluorine oil.

Claims

1. (A) 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, and (B) General formula (1): R １ -O-R ２ (1) (In the formula, R １ is an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom, R ２ is an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 3 to 6 carbon atoms substituted with at least one fluorine atom. The hydrofluoroether compound is represented by the formula: The amount of the component (A) is 10.00 to 70.00 parts by weight when the total amount of the components (A) and (B) is 100 parts by weight. Solvent composition.

2. Further, as an optional component, (C) only one or more additives selected from the group consisting of stabilizers, ultraviolet absorbers, antioxidants, and rust inhibitors are included, 2. The solvent composition according to claim 1, wherein the total amount of the components (A) and (B) is 90.00 parts by weight or more and 100 parts by weight or less, when the total amount of the solvent composition is 100 parts by weight.

3. 2. The solvent composition according to claim 1, wherein the component (B) is one or more compounds selected from the group consisting of methyl nonafluorobutyl ether and methyl nonafluoroisobutyl ether.

4. A dissolving agent for fluorine oil, comprising the solvent composition according to any one of claims 1 to 3.

5. A cleaning agent for cleaning an object having fluorine oil attached thereto, comprising the solvent composition according to any one of claims 1 to 3.

6. A fluorine oil coating agent comprising the solvent composition according to any one of claims 1 to 3 and a fluorine oil.

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