JPH0338535A - Fluorohydrocarbon pseudoazeotropic composition - Google Patents

Abstract

PURPOSE:To provide the subject composition satisfied with the excellent characteristics of the conventional Freon, capable of being used as a Freon substitute and having excellent characteristics as a solvent, etc., by comprising R123, R141b and methylene chloride. CONSTITUTION:A fluorohydrocarbon pseudoazeotropic composition comprises 49-97wt.% of (A) 1,1-dichloro-2,2,2-trichloroethane (R123), 2-49wt.% of (B) 1,1- dichloro-1-fluoro-1-fluoroethane (R141b) and 2-20wt.% of (C) methylene chloride preferably in an A:B:C ratio (wt.%) of (55-75):(15-35):(5-15). The composition exists as a pseudoazeotropic composition, is especially useful as a cleansing solvent having an excellent cleansing power and with a reduced change of the composition even when recycled. The composition can be used in the same manner as the conventional single Freon and does not require the large change of conventional techniques.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a novel fluorinated hydrocarbon-based pseudoazeotropic composition that can be used as a CFC substitute and has excellent properties as a solvent and the like.

[Prior art] Fluorinated hydrocarbon compounds (hereinafter simply referred to as fluorocarbons) are
Many of them are less toxic and chemically stable, and various types of fluorocarbons with different standard boiling points are available.Using these properties, 1.1.2-trichloro-1, 1.1.2-trichloro-1, 2,2-)-Lifluoroethane (R113) is used, trichloromonofluoromethane (R11) is used as a blowing agent, and dichlorodifluoromethane (R12) is used as a propellant or refrigerant.

[Problem to be solved by the invention] R11, R12, and R113, which are particularly stable chemically, have a long life in the troposphere and diffuse into the stratosphere, where they are decomposed by sunlight and generate chlorine radicals. Because it causes a chain reaction with ozone and destroys the ozone layer.
These conventional regulations on the use of fluorocarbons have now been implemented. For this reason, the search for alternative fluorocarbons that are less likely to deplete the ozone layer is being actively conducted in place of these conventional fluorocarbons.

An object of the present invention is to provide a new fluorocarbon composition that can be used as a fluorocarbon substitute while reducing the amount of conventional fluorocarbons used and satisfying the excellent properties of the fluorocarbons. .

[Means for Solving the Problems] The present invention provides 1.1-dichloro-2,2,2-trifluoroethane (R123, boiling point 27.6°C), 1.1-
Dichloro-1-fluoroethane (R141b boiling point 32℃
).

and methylene chloride (boiling point 39.8°C). The composition of the present invention has a quasi-azeotropic composition and has higher cleaning power than conventional R113 alone as a cleaning solvent.
It is extremely useful as an alternative.

Furthermore, there is little change in composition even after recycling, and
It has the advantage that it can be used in the same way as conventional single fluorocarbons and does not require major changes to the conventional technology.

The mixing ratio of the composition of the present invention is 49 to 97% by weight of R123.
, R141b is 2 to 49% by weight, and methylene chloride is 2 to 20% by weight, preferably R123 is 5% by weight.
5-75% by weight, 15-35% by weight of 8141b.

and methylene chloride in an amount of 5 to 15% by weight.

Other components may be further added to the composition of the present invention depending on the intended use. For example, pentane in its application as a solvent.

Isopentane, hexane, isohexane, neohexane, heptane, isohexane, 2,3-dimethylbutane,
Hydrocarbons such as cyclopentane, nitroalkanes such as nitromethane, nitroethane, nitropropane, amines such as diethylamine, triethylamine, isopropylamine, butylamine, isobutylamine, methanol, ethanol, n-propyl alcohol, i-propyl alcohol, Alcohols such as n-butyl alcohol, i-butyl alcohol, S-butyl alcohol, t-butyl alcohol, ethers such as methyl cellosolve, tetrahydrofuran, 4-dioxane, ketones such as acetone, methyl ethyl ketone, methyl butyl ketone, acetic acid Esters such as ethyl, propyl acetate, butyl acetate,
trans-1,2-dichloroethylene, cis-1
, 2-dichloroethylene, halogenated hydrocarbons such as 2-bromopropane, others, 1,1,2-trichloro-
Fluorocarbons other than those of the present invention, such as 2,2-difluoroethane (R122), etc. can be added as appropriate.

The fluorinated hydrocarbon layered azeotropic composition of the present invention can be used in various applications such as heat carriers and blowing agents, similar to conventional fluorocarbons, and has higher dissolving power than conventional R113, especially when used as a solvent. Therefore, it is suitable.

A specific use of the solvent is flux.

Remover for grease, oil, wax, ink, etc.

Paint solvents, extractants, glass, and ceramics.

Various products made of plastic, rubber, and metal, especially IC parts,
Examples include cleaning agents and draining agents for electrical equipment, precision machinery, optical lenses, etc. Cleaning methods include hand wiping,
Dipping, spraying, shaking, ultrasonic cleaning, steam cleaning, etc. may be used.

[Example] Examples of the present invention are shown below.

Example 1 A flux cleaning test was conducted using the composition of the present invention. Flux (Tamura AL-4.
Tamura Manufacturing Co., Ltd.) was applied, baked for 2 minutes in an electric furnace at 200°C, and then immersed in the composition of the present invention for 5 minutes. A similar test was also conducted for R113 as a comparative example.

Table 1 shows the mixing ratio of the composition of the present invention and the degree of flux removal.

Table 1 0: Can be removed well ○: Good △: Trace amount remains
×: Significant residual Example 2 A machine oil cleaning test was conducted using the composition of the present invention.

5O3-304 test piece (25mm+X 30m
2 mm thick) was immersed in machine oil (CQ-30, manufactured by Nippon Oil Corporation) for 5 minutes, and then immersed in the composition of the present invention for 5 minutes.As a comparative example, R113 was also subjected to a similar test.

The mixing ratio of the composition of the present invention and the degree of removal of machine oil are shown in Table 2.

Table 2 0: Can be removed well ○: Good △: Trace amount remains
×: Significant residual [Effect of the invention] The fluorinated hydrocarbon-based pseudoazeotropic composition of the present invention can be used as an alternative to conventional fluorocarbons while satisfying the excellent properties of conventional fluorocarbons. Since it can be used in the same way as , it has the advantage that it does not require major changes to the conventional technology. In addition, R113, which is often used as a solvent,
R1 has better ability to dissolve and remove flux and oil than R1.
It is most suitable as a cleaning solvent in place of 13.

Claims (2)

[Claims] (1) A fluorinated hydrocarbon-based pseudoazeotropic composition consisting of 1,1-dichloro-2,2,2-trifluoroethane, 1,1-dichloro-1-fluoroethane, and methylene chloride. (2) 49-97% by weight of 1,1-dichloro-2,2,2-trifluoroethane, 2-49% by weight of 1,1-dichloro-1-fluoroethane, and 2-49% of methylene chloride
Composition according to claim 1, consisting of 20% by weight.