JPH0617093A - Emulsion composition for cleaning - Google Patents

Abstract

PURPOSE:To obtain a hydrofluorocarbon emulsion composition for cleaning, which has little possibility of causing the ozonosphere depletion and has such detergency for ionic contaminants that it can substitute for the conventional chlorofluorocarbon detergents such as CFC-113, by mixing decafluoropentane, a surfactant and water. CONSTITUTION:The composition comprises a mixture of decafluoropentane, a surfactant and water. An example of the decafluoropentane is 1,1,1,2,3,4,4,5,5,5- decafluoropentane (having a boiling point of about 55 deg.C). As the surfactant, a fluorinated surfactant is preferably used in an amount of about 0.1-10wt.% based on the decafluoropentane. The amount of water to be incorporated is about 0.1-20wt.% based on the decafluoropentane. To improve the detergency for oil-soluble contaminants, an organic liquid comprising, e.g. a hydrocarbon, a chlorocarbon or a chlorofluorocarbon may be incorporated into this composition.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a water-in-oil type emulsion composition containing a novel highly fluorinated hydrofluorocarbon, which is a stain for precision machinery, optical equipment and electronic equipment, especially water-soluble. The present invention relates to a composition suitable for removing soil.

[0002]

2. Description of the Related Art During the manufacturing and processing of precision machinery, optical equipment and electronic equipment, and during finishing and periodic inspections, in addition to oil-soluble dirt such as processing oil and rust preventive oil, water-soluble dirt is washed off. Will be required. When cleaning both stains at the same time, the cleaning efficiency is high and the cleaning liquid itself can be easily removed without damaging the object to be cleaned, and a chlorofluorocarbon-based cleaning agent containing a surfactant and water (for example, CFC-113 A boiling point of about 48 ° C., Japanese Patent Publication No. 44-8973) has been used.

However, from the perspective of protecting the ozone layer, CFC-11 (trichlorofluoromethane), CFC-12 (dichlorodifluoromethane) and CFC- are also used in Japan based on the Vienna Convention (1985) and the Montreal Protocol (1987). 113,
With regard to chlorofluorocarbons such as CFC-114 and CFC-115, production volume reductions and usage restrictions have been implemented.

[0004]

Therefore, the present invention is a cleaning emulsion composition that does not damage the ozone layer.
It is an object of the present invention to provide a new hydrofluorocarbon-based cleaning agent having an ionic contamination cleaning power that can replace conventional chlorofluorocarbon-based cleaning agents such as CFC-113.

[0005]

The cleaning emulsion composition of the present invention is characterized by comprising decafluoropentane, a surfactant and water.

Since decafluoropentane does not contain chlorine, it does not destroy the ozone layer, is nonflammable, and has a boiling point close to that of CFC-113 and selective solubility. Therefore, it contains a surfactant and water. The water-in-oil emulsion composition is useful as a cleaning agent against ionic contamination.

As decafluoropentane, 1,1,1,2,
An example is 3,4,4,5,5,5-decafluoropentane (HFC-43-10mee: boiling point: about 55 ° C), but it may be one or a mixture of two or more selected from other decafluoropentanes. It doesn't matter.

The surfactant is preferably a fluorine-containing surfactant because of its detergency and solubility in decafluoropentane, more preferably a fluorine-containing nonionic surfactant, and R _f SO ₂ NR (C ₂ H ₄ O) _n H (where R _f has 5 carbon atoms
-18 perfluoroalkyl group, R is an alkyl group having 2 to 6 carbon atoms, and n is an integer of 1 to 20) and the like.

In addition, those which form a water-in-oil emulsion usually used for chlorofluorocarbon type detergents can be used. For example, anionic surfactants such as alkylbenzene sulfonate, aliphatic monocarboxylate, alkyl Sulfate ester salt, alkyl phosphate ester salt, polyoxyalkylene alkyl ether phosphate ester, etc. as nonionic surfactant Polyoxyalkylene alkyl ether, polyethylene glycol fatty acid ester, pentaerythritol fatty acid partial ester, etc. as cationic surfactant It can be appropriately selected from polyethylene polyamine fatty acid amide salt, alkyl phosphate quaternary ammonium salt and the like.

The content of the surfactant is 0.1 to 10% by weight, preferably 1 to 5% by weight, based on decafluoropentane.

Water dissolves water-soluble stains containing salts and other inorganic substances, and its content is 0.1 to 20% by weight, preferably 1 to 10% by weight, based on decafluoropentane. Emulsions containing less than 0.1% by weight of water do not have the desired detergency of ionic contaminants.

The cleaning emulsion composition of the present invention contains hydrocarbons, chlorocarbons, chlorohydrocarbons, chlorofluorocarbons and hydrochlorofluorocarbons in order to improve the cleaning property for stains that dissolve in oil. And at least one organic liquid selected from hydrofluorocarbons other than decafluoropentane may be mixed. The mixing ratio of these organic liquids to the main cleaning emulsion is preferably 50% by weight or less from the viewpoint of flammability and ozone layer protection.

The hydrocarbon preferably has 5 to 10 carbon atoms, and includes n-pentane, isopentane, n-hexane, isohexane, 2,3-dimethylbutane, cyclopentane, sillohexene, cyclohexane, benzene, toluene,
Xylene etc. are illustrated.

The chlorocarbons include dichloromethane, dichloroethylene, chloroform, 1,1,1-trichloroethane, 1,2-dichloroethylene, 1-chloropropane,
Chlorobutane, bromchloromethane, etc. are exemplified, and chlorohydrocarbons, chlorofluorocarbons, and hydrochlorofluorocarbons can be mixed, but since chlorine is contained, the mixing amount should be the minimum necessary.

In the cleaning emulsion composition of the present invention, nitroalkanes, epoxides, furans,
It may contain at least one selected from benzotriazoles, phenols and amines.

Specific examples of uses of the cleaning emulsion composition of the present invention include stains on metal parts, plastic parts, glass parts and the like in the precision machinery industry, electronic industry, etc., particularly oil solubility such as fingerprints. It is suitably used for water-soluble mixed complex pollution and cleaning of the type that combines mechanical parts and electrical parts. It is also used as a drying solvent that removes traces of moisture in various washed products and dries it.

When used as the above-mentioned cleaning agent, dipping, submerged spraying, ultrasonic wave, etc. can be applied. Moreover, you may combine them.

The present invention will be described in detail below with reference to examples.

[0019]

[Examples 1 and 2] A slide glass for a microscope having one drop of Coca-Cola attached thereto was ultrasonically cleaned at room temperature for 2 minutes in a water-in-oil type cleaning emulsion having the composition shown in Table 1 below. Shown in 1.

[0020]

Comparative Example 1 Table 1 shows the results of the same operation as in Example 1 using decafluoropentane alone.

[Table 1]

[0021]

[Examples 3 and 4] A microscope slide glass having a fingerprint attached thereto was ultrasonically cleaned at room temperature for 2 minutes in a water-in-oil type cleaning emulsion having the composition shown in Table 2 and the results are shown in Table 2. Show.

[0022]

Comparative Example 2 Table 2 shows the results of the same operation as in Example 1 using decafluoropentane alone.

[Table 2]

[0023]

INDUSTRIAL APPLICABILITY The cleaning agent of the present invention has no adverse effect on the ozone layer, and has the ability to remove water-soluble contaminants from an object to be cleaned, as is clear from the examples. It is possible to clean them without damaging the material of the equipment.

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Claims (3)

[Claims] 1. A cleaning emulsion composition comprising decafluoropentane, a surfactant and water. 2. Decafluoropentane is 1,1,1,2,3,4,4,
The cleaning emulsion composition according to claim 1, which is 5,5,5-decafluoropentane. 3. Decafluoropentane, a surfactant, water and 50% by weight or less of hydrocarbons, chlorocarbons, chlorohydrocarbons, chlorofluorocarbons,
A washing emulsion composition comprising at least one organic liquid selected from hydrochlorofluorocarbons and hydrofluorocarbons other than decafluoropentane.