JPH06226005A - Solvent composition for removing - Google Patents

Abstract

PURPOSE:To provide the solvent compsn. for removing stuck water of a new hydrofluorocarbon system which has a replacement property with water without losing the characteristics, such as low toxicity, noncombustibility and low corrosiveness, possessed by the solvent compsn. of a chlorofluorocarbon system, such as CFC-113, and has no possibility of destroying the ozone strata as the compsn. does not contain chlorine. CONSTITUTION:The solvent compsn. for removing the stuck water is prepd. by mixing a surfactant into decafluoropentane or a mixture composed of decafluoropentane and other org. liquid.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a solvent composition for removing adhering water using a novel highly fluorinated hydrofluorocarbon, and further for metal parts in precision machinery industry, optical machinery industry, electronic industry and the like. The present invention relates to a solvent composition for removing adhered water for replacing adhered water after washing plastic parts, glass parts, etc. with water and drying the solvent.

[0002]

2. Description of the Related Art Recently, in the production of precision metal parts, optical parts and electronic parts, the number of processes using water or washing with water is increasing, and it is necessary to remove the adhered water as a post-treatment of this process. is there. Usually, to remove this adhered water,
Chlorofluorocarbons (eg, chlorofluorocarbons) that have excellent boiling point characteristics such as low toxicity, nonflammability, low corrosion resistance, etc.
CFC-113: boiling point of about 48 ° C.) and a composition in which a surfactant is mixed are often used. However, from the perspective of protecting the ozone layer, the reduction of production of chlorofluorocarbons in Japan is also based on the Vienna Convention and the Montreal Protocol.
Usage restrictions are enforced.

[0003]

Therefore, in the present invention, the water displacing property is maintained without losing the low toxicity, nonflammability, and low corrosive properties of the solvent composition for removing chlorofluorocarbon-based adherent water such as CFC-113. An object of the present invention is to provide a novel solvent composition for removing hydrofluorocarbon-based adhering water, which has no chlorine and does not contain chlorine and therefore does not damage the ozone layer.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted research on a solvent composition for removing adhering water in order to achieve the above object, and as a result, decafluoropentane or a mixture of decafluoropentane and another organic liquid has been obtained. It was found that a composition obtained by mixing a surfactant with the above is useful as a solvent composition for removing adhered water.

The decafluoropentane of the present invention includes
1,1,1,2,3,4,4,5,5,5-decafluoropentane (hereinafter HFC-
(Abbreviated as 43-10mee) is exemplified, but it may be one kind or a mixture of two or more kinds selected from other decafluoropentane. Since HFC-43-10mee does not contain chlorine, it has an ozone depletion potential of 0, a boiling point of about 55 ° C., is nonflammable, and has low toxicity and low corrosivity, and is suitable as a solvent composition for removing adhered water.

Examples of the surfactant include nonionic surfactants such as carboxylic acid salts, sulfonic acid salts, sulfuric acid ester salts and phosphoric acid ester salts, which are anionic surface active agents used in conventional solvent compositions for removing chlorofluorocarbon-based water. Ionic surfactant ether type, ester type, ester ether type, etc., cationic surfactant polyoxyalkylene alkyl ether, polyoxyalkylene alkyl ether phosphate ester, polyoxyalkylene alkylamide, alkylbenzene sulfonate, Alkyl phosphate quaternary ammonium salts, polyethylene glycol fatty acid esters, etc. can be selected, but fluorine-containing surfactants are more preferable, and fluorine-containing nonionic surfactants are more preferable because of their solubility in decafluoropentane. ₂ N
R (C ₂ H ₄ O) nH (wherein Rf is a C 5-18 perfluoroalkyl group, R is a C 2-6 alkyl group, and n is 1
Represents an integer of 20) and the like.

The amount of the surfactant blended is 0.01 to 10% by weight, preferably 0.1 to 10% by weight of decafluoropentane.
It is 5% by weight. If the amount of the surfactant is 10% by weight or more, the surfactant may remain on the surface of the object to be treated even after this treatment step, and if it is 0.01% by weight or less, the effect of removing the adhered water is difficult to be exhibited.

The solvent composition for removing adhered water of the present invention is prepared by immersing an object to be treated in the solvent composition to remove water adhering to the object to be treated by the action of the solvent composition so that the water has a specific gravity difference. In order to remove the water adhered from the object to be treated by floating on the surface of the solvent composition, and then to remove the solvent composition by drying the object to be treated at a temperature lower than the removal of water It is useful.

When it is necessary to stabilize the solvent composition for removing adhered water of the present invention, at least one selected from nitroalkanes, epoxides, furans, benzotriazoles, phenols and amines as a stabilizer. Seeds may be included.

Further, an organic liquid such as hydrocarbons, halogenated hydrocarbons and ethers may be mixed with decafluoropentane within a range not impairing the effects of the present invention. The mixing ratio of these organic liquids is not particularly limited, but from the viewpoint of combustibility and ozone layer protection, it is suitable to be within 50% by weight in the solvent composition for removing adhered water, and decafluoropentane is preferable. Compatibility with, azeotropic property, ability to remove adhering water,
It is determined in consideration of flammability and toxicity of the composition.

The hydrocarbons preferably have 5 to 10 carbon atoms, and include n-pentane, isopentane, n-hexane, isohexane, 2,3-dimethylbutane, cyclopentane, cyclohexene, cyclohexane, benzene, toluene and xylene. Etc. are illustrated.

Examples of the halogenated hydrocarbons include methylene chloride, trans-1,2-dichloroethylene, trichloroethylene, tetrachloroethylene and the like.

As the ethers, diethyl ether,
Examples include diisopropyl ether, tert-butyl methyl ether, 1,4-dioxane and the like.

As a specific use of the solvent composition for removing adhered water of the present invention, after washing metal parts, plastic parts, optical parts, etc. in precision machinery industry, electronic industry, etc.,
It is preferably used for substituting the solvent for the water remaining on the object to be dried without heating the object to be cleaned to a high temperature. When used as a solvent composition for removing adhered water as described above,
Methods such as dipping, showering, submerged spraying, and ultrasonic bath can be applied.

The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.

[0016]

Example 1 3 ml of pure water was put into a 25 ml (millimeter) graduated cylinder and the diameter was 0.4 mm up to the marked line of 8 ml.
Put glass beads. After that, HFC-43-10mee containing 0.5% by weight of a fluorine-containing surfactant (manufactured by Tochem: EF-122B) was put up to the mark line of 25 ml. Immediately after the start of the addition, the amount of water floating above was measured at regular intervals, and the ratio was defined as the dehydration rate. The results are shown in Table 1.

[0017]

[Comparative Example 1] The same operation as in Example 1 was performed without adding a surfactant to HFC-43-10mee. The results are shown in Table 1.

[Table 1]

As is clear from Table 1, decafluoropentane alone cannot remove the water adhering to the object to be treated, but the composition prepared by mixing decafluoropentane with a surfactant adheres to the object to be treated. Removes and transfers the water that is being generated.

[0019]

Example 2 A clean 2.5 × 7.5 mm slide glass was immersed in an aliphatic hydrocarbon-based detergent (Dupont's detergent Axarel 32) at 65 ° C. for 1 minute. Then, in an emulsion of an aliphatic hydrocarbon-based detergent and water for 1 minute at 60 ° C, for 1 minute in warm water at 65 ° C, and then another 65 ° C.
After standing in warm water for 1 minute, HFC-43-1 containing 0.5wt% fluorine-containing surfactant (Tochem: EF-122B)
After standing still for 1 minute in the boiling liquid of 0mee, it was left standing for 1 minute in the vapor phase of HFC-43-10mee, and the appearance of the slide glass was visually evaluated. The results are shown in Table 2.

[0020]

Example 3 Instead of HFC-43-10mee, an azeotropic mixture of HFC-43-10mee and trans-1,2-dichloroethylene (weight ratio 6
2:38) and the same test as in Example 2 was performed. The results are shown in Table 2.

[0021]

[Comparative Example 2] The same operation as in Example 2 was performed without adding a surfactant to HFC-43-10mee. The results are shown in Table 2.

[0022]

Comparative Example 3 A clean 2.5 × 7.5 mm slide glass was immersed in an aliphatic hydrocarbon-based detergent (Dupont's detergent Axarel (registered trademark) 32) at 65 ° C. for 1 minute. Then, in an emulsion of an aliphatic hydrocarbon-based detergent and water at 60 ° C for 1 minute, and further in warm water at 65 ° C for 1 minute,
Next, after leaving still in another 65 ° C. warm water for 1 minute, it was dried with hot air at 85 ° C. for 5 minutes, and the appearance of the slide glass was visually evaluated. The results are shown in Table 2.

[Table 2]

As is clear from Table 2, when the solvent composition for removing adhered water of the present invention is used for drying, the finish of the object to be treated is good.

[0024]

EFFECTS OF THE INVENTION The solvent composition for removing adhered water of the present invention has the ability of removing and displacing water from the object to be cleaned as is clear from the examples, and has no adverse effect on the ozone layer. The same method of use as that of CFC-113 that has been used can be adopted.

Claims (3)

[Claims] 1. A solvent composition for removing adhered water, comprising a surfactant mixed with decafluoropentane or a mixture of decafluoropentane and another organic liquid. 2. Decafluoropentane is 1,1,1,2,3,4,4,
The solvent composition for removing adhered water according to claim 1, which is 5,5,5-decafluoropentane. 3. The solvent composition for removing adhered water according to claim 1, wherein the surfactant is a fluorine-containing surfactant.