JPH05214384A - Cleaning solvent containing 2h,5h-perflourohexane - Google Patents

Abstract

PURPOSE:To obtain the subject solvent useful as a substitute for fluorocarbons for the removal of machining oil for precision machine part, optical instrument part, etc., flux used in the soldering of electrical or electronic part and stain of clothes by using a perfluorohexane as an active component. CONSTITUTION:The objective solvent contains preferably >=70wt.% of 2H,5H- perfluorohexane. The solvent may be incorporated with hydrocarbons, alcohols, ketones, ethers, esters, chlorinated hydrocarbons, etc., as necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for removing processing oils used for processing precision machine parts, optical machine parts, etc., flux used for soldering electric and electronic parts, and stains on clothes. A cleaning solvent.

[0002]

2. Description of the Related Art Various processing oils such as cutting oil, press oil, drawing oil, heat treatment oil, rust preventive oil, wax, lubricating oil and grease are used when processing precision machine parts, optical machine parts and the like. However, these oils and fats need to be finally removed, and removal with a solvent is generally performed. Soldering is the most commonly used method for joining electronic circuits.However, rosin is used for the purpose of removing and cleaning oxides on the metal surface to be soldered, preventing reoxidation, and improving the wettability of solder. It is common practice to pretreat the soldering surface with a flux containing as a main component. The soldering method includes supplying the flux to the surface of the board by dipping the board in a solution-like flux, and then supplying molten solder, or mixing the flux and solder powder in advance to form a paste. There is a method of heating after supplying it to the place to be soldered,
In any case, since the flux residue causes corrosion of the metal, deterioration of insulation, etc., it is necessary to sufficiently remove it after the soldering is completed.

Also, for cleaning clothes, cleaning with a solvent (dry cleaning) is widely used because of its good cleaning power and excellent drying property. For these applications, it is non-flammable, low in toxicity, chemically stable, has excellent solubility in oils and fats, and has little effect on materials such as rubber, plastic, metal, and clothing. Therefore, 1,1,2-trichloro-1,
2,2-trifluoroethane (hereinafter referred to as R113) is widely used.

[0004]

As described above, R113
Has many excellent features. However, it is chemically very stable, has a long life in the troposphere, is decomposed by strong ultraviolet rays until it reaches the stratosphere, releases chlorine, and destroys the ozone layer.As a result, harmful ultraviolet rays reaching the ground are increased. It has been pointed out in recent years that it will seriously affect the ecosystem on the earth, including. Therefore, R1
There are active international movements to regulate the production and consumption of CFCs with high ozone depletion capacity such as 13 and to abolish them. In response to these movements, the present invention provides a new cleaning solvent which has no ozone depletion ability and retains the excellent characteristics of R113.

[0005]

SUMMARY OF THE INVENTION The present invention provides a new cleaning solvent for achieving the above object.
That is, the present invention is a cleaning solvent containing 2H, 5H-perfluorohexane as an active ingredient. The present invention will be described below.

The cleaning solvent of the present invention contains 5% as an active ingredient.
It is preferable to contain 0% by weight or more of 2H, 5H-perfluorohexane. Furthermore, it is preferably 70% by weight or more. The cleaning solvent of the present invention may contain at least one selected from organic solvents such as hydrocarbons, alcohols, ketones, ethers, esters, and chlorinated hydrocarbons, if necessary. . The addition amount of these organic solvents is preferably less than 50% by weight, but when an azeotropic composition is present, it is preferably used in the vicinity thereof.

The hydrocarbons are preferably chain or cyclic saturated or unsaturated hydrocarbons having 5 to 15 carbon atoms, for example, n-pentane, 2-methylbutane, n-hexane, 2-methylpentane, 2 , 2-dimethylbutane,
2,3-dimethylbutane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 2,4-dimethylpentane, n-octane, 2,
2,3-trimethylpentane, isooctane, n-nonane, 2,2,5-trimethylhexane, decane, dodecane, 1-pentene, 2-pentene, 1-hexene, 1-
Heptene, 1-nonene, 1-decene, cyclopentane,
Examples thereof include methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, paramenthane, cyclohexene, α-pinene, dipentene, decalin, petroleum ether, petroleum benzine, ligroin, gasoline, and kerosene.

Examples of alcohols include methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, t-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, isopentyl alcohol, t-pentyl alcohol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 4-methyl-2-pentanol , 2-ethyl-1-
Butanol, 1-heptanol, 2-heptanol, 3
-Heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1-nonanol,
1-decanol, 1-undecanol, 1-dodecanol, cyclohexanol, methylcyclohexanol,
Examples thereof include ethylene glycol and propylene glycol.

Examples of the ketones include acetone, methyl ethyl ketone, 2-pentanone, 2-hexanone,
Methyl isobutyl ketone, 2-heptanone, 4-heptanone, diisobutyl ketone, phorone, isophorone, cyclohexanone, methylcyclohexanone and the like can be mentioned. Examples of ethers include diethyl ether,
Examples thereof include dipropyl ether, diisopropyl ether, dibutyl ether, tetrahydrofuran and the like.

Examples of the esters include methyl formate, ethyl formate, propyl formate, butyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, isopentyl acetate, 3-methoxybutyl. Acetate, sec-hexyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, methyl propionate, ethyl propionate, butyl propionate, isopentyl propionate, methyl acetate, ethyl acetate, ethyl isovalerate, γ- Butyrolactone and the like can be mentioned.

Examples of the chlorinated hydrocarbons include methylene chloride, 1,1-dichloroethane, 1,2-dichloroethane, 1,1-dichloroethylene, 1,2-dichloroethylene, trichloroethylene and tetrachloroethylene. Etc. If necessary, various auxiliaries such as a surfactant, an antistatic agent, and a rust preventive can be added to the cleaning agent of the present invention.

[0012]

EXAMPLES Next, examples of the present invention will be shown.

[0013]

Example 1 A stainless steel wire net (30 mesh) coated with a dye-colored cutting oil (manufactured by Nippon Oil Co., Ltd., trade name: Unicut GH35) was immersed in a cleaning agent for 5 minutes and then taken out, and the cutting oil for the wire net was taken. Was visually observed.
The results are shown in Table 1.

[0014]

[Table 1]

[0015]

[Example 2] A glass epoxy printed circuit board was dipped in a flux (Tamura Kaken, trade name: F-320V), air-dried, and then soldered at 250 ° C to a test piece, which was dipped in a cleaning agent for 5 minutes and ultrasonicated. After washing, it was taken out and the residual state of the flux was visually observed. The results are shown in Table 2.

[0016]

[Table 2]

[0017]

[Example 3] Using a cleaning tester manufactured by Ueshima Seisakusho, a carbon-contaminated cloth (wool) manufactured by Test Fabric Co. was used at 23 ° C.
Table 3 shows the results of the visual evaluation of the washing effect after washing for 10 minutes.

[0018]

[Table 3]

[0019]

As is apparent from the examples, the cleaning solvent of the present invention is useful as a cleaning solvent replacing R113, which has a high ozone depleting ability.

Claims (1)

[Claims] 1. A cleaning solvent comprising 2H, 5H-perfluorohexane as an active ingredient.