JPH06170108A - Solvent for dehydration - Google Patents

Abstract

PURPOSE:To provide a solvent as a substitute for CFC 113 which has high ozone layer destructive function by using a fluorhydrocabon with a specified composition as an effective component of a solvent for dehydration. CONSTITUTION:A fluorohydrocarbon of the formula I (wherein n is 2 to 4 integer, m is 1 to 2 integer) is used as an effective component of a solvent for dehydration. At least one kind of surfactant selected from among alcohols such as methanol, ethanol, etc., ketones such as acetone, etc., ethers such as polyoxyethylene, etc., is added to the fluorohydrocabon such as (2H-per fluoropropyl)ethylene (CF3CHFCF2CH=CH2).

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 CFC 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. 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 comparable to that of conventional draining agents.

[0005]

As a result of intensive studies, the present inventor has found that at least one selected from alcohols, ketones and surfactants is added to the fluorinated hydrocarbon represented by the following general formula. The inventors have found that the above problems can be achieved by the addition, and have reached the present invention. (Wherein, n an integer of 2 to 4, m is an integer of _{1~2.) C n H m F} 2n + 1-m -CH = CH 2 Examples of the fluorinated hydrocarbon, specifically, , (2H-
Perfluoropropyl) ethylene (CF ₃ CHFCF ₂
CH = CH _2), (4H- perfluorobutyl) ethylene _{(HCF 2 (CF 2) 3} CH = CH 2), allyl perfluoropropane _{(n-C 3 F 7 CH} 2 CH = C
H _2), 2-allyl-perfluoropropane ((CF _3)
2 CFCH ₂ CH = CH ₂ ) and the like.

Alcohols having 8 or less carbon atoms are preferable, for example, 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, cyclohexanol, methylcyclohexanol,
2,2,2-trifluoroethanol, 1H, 1H-pentafluoro-1-propanol, 2,2,3,3-tetrafluoro-1-propanol, 1H, 1H-pentafluoro-1-butanol, ethylene glycol, Propylene glycol and the like can be mentioned. More preferable are methanol, ethanol, isopropanol and the like.

The amount of alcohol added is 0 to 30% by weight,
Preferably 0 to 20% by weight, more preferably 0 to 15
% By weight. The ketones preferably have 9 or less carbon atoms, and include, for example, acetone, methyl ethyl ketone,
2-pentanone, 2-hexanone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, methyl cyclohexanone, etc. are mentioned. Acetone, methyl ethyl ketone and the like are more preferable.

The amount of ketones added is 0 to 30% by weight, preferably 0 to 20% by weight. The total amount of alcohols and ketones added is 0 to 50% by weight, preferably 0.
-30% by weight, more preferably 0-20% by weight. As the surface active agent, known anionic surface active agents, cationic surface active agents, nonionic surface active agents, and amphoteric surface active agents can be used. Examples of the anion activator include carboxylic acid salts, sulfonic acid salts, sulfuric acid ester salts, and phosphoric acid ester salts. Examples of the cationic activator include salts of amines with various acids and quaternary ammonium salts.

Examples of the nonionic activator include polyoxyethylene ether, polyoxyethylene-polyoxypropylene glycol, polyoxyethylene-polyoxypropylene alkyl ether, and fatty acid partial ester of polyhydric alcohol. Examples of the amphoteric activator include betaine type, amino organic acid type, and amine salt of fatty acid. Activators containing a fluorine atom in the molecule of these compounds are also suitable.

The amount of these surfactants added is 0 to 10% by weight, preferably 0 to 5% by weight.

[0011]

EXAMPLES The present invention will be described below with reference to examples.
The scope of the invention is not limited to these examples.

[0012]

[Example 1] 100 g of glass beads having a diameter of 0.8 mm and a wire net basket (30 mesh) having a diameter of 40 mm and a height of 60 mm
After being immersed in water colored with a dye, the basket was immersed in 500 ml of a draining solvent containing 2H-perfluoropropylethylene as an active ingredient in a beaker for 2 minutes, and the residual state of water was visually observed. The results are shown in Table 1.

[0013]

Example 2 Table 2 shows the results of the same tests as in Example 1 performed on a water draining solvent containing 4H-perfluorobutylethylene as an active ingredient.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

As is apparent from the examples, the water-removing solvent of the present invention is useful as a solvent replacing the water-removing solvent using CFC 113, which has a large ozone layer depleting ability.

Claims (1)

[Claims] 1. A dehydration solvent containing a fluorinated hydrocarbon represented by the following general formula as an active ingredient. _{C n H m F 2n + 1} -m -CH = CH 2 ( wherein, n an integer of 2 to 4, m is an integer of 1-2.)