JPH05140776A - Dewatering solvent composition - Google Patents

Abstract

PURPOSE:To develop a dewatering solvent for cleaning water without destructing the ozone layer and without adversely affecting metal by adding a completely fluorinated fatty acid and an aliphatic amine to a specified completely fluorinated compd. in a specified ratio. CONSTITUTION:The remaining cleaning water used to clean the parts of various precision instruments is removed, and the parts are rapidly dried. In thus case, <=0.5 pts.wt. of a <=5C completely fluorinated fatty acid such as perfluorooctanic acid and 1.0 pt.wt. of the total of the equimolar amts. of at least one kind among 4-7C aliphatic primary amine such as methylamine, dimethylamine and trimethylamine and the compltely fluorinated fatty acid are added to 100 pts.wt. of a completely fluorinated compd. such as perfluoropentane having 30-150 deg.C b.p. to obtain a dewatering solvent composition, and the composition is used to remove the water deposited on the parts. Consequently, a metal to be cleaned is not adversely affected, and the ozone layer is not destructed by the composition unlike fluorocarbons.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to precision instruments, optical instruments,
The present invention relates to a draining solvent that removes water adhering to the surface of a component such as an electronic device after washing the component with water.

[0002]

2. Description of the Related Art When cleaning parts such as precision equipment, optical equipment, and electronic equipment, a method of cleaning with pure water after treatment with a suitable detergent suitable for contaminants is widely used. A drying step is required to remove the water present on the article surface. As a drying means, physical methods such as heating, decompression, and centrifugation have been used for a long time, but in recent years, a drying method using a solvent that has a low energy cost and is capable of high-speed drying has become widespread. As a solvent, a liquid obtained by adding a surfactant or ethanol to trichlorotrifluoroethane (hereinafter referred to as Freon R113) is widely used.

[0003]

Fluorocarbon R113 has a lot of excellent properties such as nonflammability, low toxicity and low surface tension, and thus the demand has rapidly increased, but it is chemically stable and within the troposphere. It has been pointed out in recent years that it has a long lifespan and that it reaches the stratosphere, destroys the ozone layer, and increases harmful ultraviolet rays that reach the surface of the earth, resulting in a serious impact on the earth's ecosystem, including humankind.

For this reason, there is an active international movement to regulate the production and consumption of CFCs such as CFC R113 having a high ozone depletion potential and to abolish them. Although a perfluorinated compound is proposed in Japanese Patent Application Laid-Open No. 2-184302 as a draining agent that does not destroy the ozone layer, the compound proposed in the publication has a very weak draining ability and cannot be put to practical use.

In order to cope with such a situation, the present invention provides a novel draining solvent which does not destroy the ozone layer and has a draining ability higher than that of conventional draining agents.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned objects, and as a result, the perfluorinated compounds shown below alone or in combination thereof have extremely weak draining ability. However, it was found that the addition of a small amount of a certain type of perfluorinated fatty acid showed a remarkably excellent draining ability, and a patent application was filed. (Japanese Patent Application No. 3-196804) However, as a result of the subsequent studies, it was found that the solvent for draining had an effect on the metal when the article to be dried was a metal, and the excellent draining ability of this composition. The present invention has been achieved as a result of further studies to obtain a composition that does not affect the metal while maintaining the performance.

That is, the present invention provides (1) a boiling point of 30 to 1
A solvent composition for draining, which comprises a perfluorinated compound (2) at 50 ° C. and a perfluorinated fatty acid (3) aliphatic amine having 5 or more carbon atoms. Hereinafter, the present invention will be described in detail.

The perfluorinated compound used in the present invention has a balance between loss due to evaporation and drying property.
It is necessary that the boiling point is 30 to 150 ° C. For example, perfluoropentane, perfluorohexane, perfluoroheptane, perfluorooctane, perfluorodimethylcyclobutane, perfluoromethylcyclopentane, perfluoromethylcyclohexane, perfluorodimethylcyclohexane, perfluoro-2-butyltetrahydrofuran, perfluoro- 2-propyltetrahydropyran, perfluorodibutyl ether,
Examples thereof include perfluorotripropylamine, and of course, a mixture of these may be used. In the present invention,
Perfluorination means a state in which hydrogen in a compound is completely replaced with fluorine.

Next, perfluorooctanoic acid is preferable as the perfluorinated fatty acid having 5 or more carbon atoms, but it is not limited thereto. Further, the addition amount thereof can be arbitrarily selected, but even if it is 0.5% by weight or less, the purpose can be sufficiently achieved. As the aliphatic amine, for example,
Methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, propylamine, isopropylamine, dipropylamine,
Diisopropylamine, tripropylamine, triisopropylamine, butylamine, isobutylamine, sec-butylamine, sec-butylamine, dibutylamine,
Diisobutylamine, tributylamine, pentylamine, dipentylamine, tripentylamine, hexylamine, dihexylamine, trihexylamine, 2-
Ethylhexylamine, 1,3-dimethylbutylamine, heptylamine, octylamine, 1-methylheptylamine, allylamine, cyclohexylamine, aziridine, azetidine, pyrrolidine, piperidine, ethanolamine, diethanolamine, triethanolamine, ammonia and halogen substitution thereof. It can be used by the body, but of course is not limited thereto.

The amount of the aliphatic amine used is preferably equimolar to the perfluorinated fatty acid, or a slight excess of the amine is added, and both may be mixed in advance or added separately. . The addition amount can be arbitrarily selected, but if the total amount of both is 1.0 weight% or less, the object can be sufficiently achieved. The draining solvent of the present invention may contain various other components other than the above depending on the purpose. For example, nitro compounds, phenols, organic phosphites, and triazoles can be contained as stabilizers. It is also possible to contain hydrocarbons and ethers in order to enhance the solubility of these stabilizers.

[0011]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Reference Examples. In addition, the following methods were used to measure the drainage ability and the influence on the metal. (Measuring method of drainage capacity) 4 ml of water colored with patent blue was placed in a 25 ml graduated cylinder, and glass beads having a diameter of 0.71 to 0.99 mm (manufactured by Kojima Special Glass Mfg. Co., Ltd .; model number BZ-08) 17 After gently adding 0.5 g, tap the bottom of the measuring cylinder until the glass beads are completely immersed in water. After that, 6 ml of solvent for draining
When the water was added, the colored water started to move to the upper layer, but the colored water was completely replaced by the draining solvent, and the time until the added 4 ml floated on the upper layer was measured. It was judged that the shorter the time, the better the draining ability. (Influence on metal) Iron, copper, zinc,
Immerse the aluminum test piece and leave it at room temperature overnight,
The state of the metal surface was observed.

[0012]

Examples 1 to 5 0.2 parts by weight of perfluorooctanoic acid, and 100 parts by weight of various perfluorinated compounds, and various amines in equimolar amounts thereof were added to the water-removing solvent to remove metal and to remove metal. The results of measuring the influence are shown in Table 1. All of them showed excellent draining performance and no influence on metals was observed.

[0013]

[Comparative Example 1] When the draining performance of perfluorohexane alone was measured, no upward movement of colored water was observed.

[0014]

[Comparative Example 2] The composition obtained by adding perfluorooctanoic acid to perfluorohexane was measured for drainage performance and showed excellent drainage performance. However, when the effect on metals was confirmed, iron, copper, zinc, The formation of white material was seen on all metal surfaces of aluminum.

[0015]

[Comparative Example 3] The draining performance of a draining solvent prepared by adding 6% by weight of ethanol to Freon 113 was measured. As a result, it took 120 seconds for the colored water to completely move to the upper layer.

[0016]

[Table 1]

[0017]

INDUSTRIAL APPLICABILITY According to the present invention, a draining agent having no ozone layer depletion and no adverse effect on metals and having superior draining performance to conventional draining solvents can be obtained.

Claims (4)

[Claims] 1. A draining solvent composition comprising (1) a fully fluorinated compound having a boiling point of 30 to 150 ° C., (2) a fully fluorinated fatty acid having 5 or more carbon atoms, and (3) an aliphatic amine. 2. The perfluorinated compound having a boiling point of 30 to 150 ° C. according to claim 1 is perfluoropentane, perfluorohexane, perfluoroheptane, perfluorooctane, perfluorodimethylcyclobutane, perfluoromethylcyclopentane, perfluoro. Methylcyclohexane, perfluorodimethylcyclohexane, perfluoro-2-butyltetrahydrofuran, perfluoro-
A solvent composition for draining, which is at least one selected from the group consisting of 2-propyltetrahydropyran, perfluorodibutyl ether, and perfluorotripropylamine. 3. A draining solvent composition in which the perfluorinated fatty acid having 5 or more carbon atoms of claim 1 is perfluorooctanoic acid. 4. The aliphatic amine according to claim 1 has 4 to 7 carbon atoms.
A solvent composition for draining, which is at least one kind of the aliphatic primary amine.