JPH02135293A - Fluorinated hydrocarbon-based azeotropic mixture - Google Patents

Abstract

PURPOSE:To obtain the subject novel mixture, consisting of trichlorotrifluoroethane and a binary azeotropic mixture of methanol- dichloroethylene, usable as a substitute fluorocarbon and simultaneously having excellent characteristics as a solvent, etc. CONSTITUTION:The objective mixture consisting of (A) 95-20wt.% (optimally about 50wt.%) 1,1,2-trichlorotrifluoroethane and (B) 5-80wt.% (optimally about 50wt.%) binary azeotropic mixture of methanol and cis-1,2-dichloroethylene. The above-mentioned mixture is used as a remover for fluxes, greases, oils, waxes, inks, etc., solvent for coatings, extracting agent, stain removing agent, detergent for IC parts, electrical appliances, precise machines, optical lenses, etc., and draining agent, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a novel fluorinated hydrocarbon azeotrope-like mixture 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 mostly non-toxic, non-flammable, and chemically stable. Various fluorocarbons are used as solvents, blowing agents, propellants, refrigerants, etc.0 For example,
As a solvent 1,1.2-) Rechloro 1.2.2-
Trifluoroethane (R113) is used as a blowing agent, 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 the generated chlorine radicals become ozone. There is a movement to restrict the use of these conventional fluorocarbons because they are said to cause a chain reaction and destroy the ozone layer. 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 mixture 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 1,1,2-trichlorofluoroethane (R1
13) and a fluorinated hydrocarbon azeotrope-like mixture consisting of a binary azeotrope of methanol and cis-1,2-dichloroethylene. The mixture of the present invention is nonflammable or flame retardant, and has higher cleaning power than the conventional old 13 alone as a cleaning solvent, so it is extremely useful as a substitute for R113.

Furthermore, R113 is suitable for the mixture of the present invention because it has the advantage that there is little change in composition even when recycled, it can be used in the same way as conventional single fluorocarbons, and it does not require major changes to the conventional technology. 95-20% by weight and 5-80% by weight of a binary azeotrope of methanol and cis-1,2-dichloroethylene, preferably R113 is 80-4
0% by weight and 20 to 60% by weight of a binary azeotrope of methanol and cis-1,2-dichloroethylene;
More preferably, it is an azeotrope-like mixture comprising about 50% by weight of R113 and about 50% by weight of a binary azeotrope of methanol and cis-1,2-dichloroethylene. Other components may be further added to the mixture of the present invention depending on the intended use. For example, when used as a solvent, hydrocarbons such as pentane, isobencune, hexane, isohexane, heptane, and isohebutane, nitroalkanes such as nitromethane, nitroethane, and nitropropane, diethylamine, triethylamine, isopropylamine, butylamine, isobutyl Amines such as amines, ethanol, n-propyl alcohol, i-propyl alcohol, n-butanol, i-butanol,
Alcohols such as methyl cellosolve, tetrahydrofuran, ethers such as 1,4-dioxane, acetone,
One or more selected from ketones such as methyl ethyl ketone and methyl butyl ketone, and esters such as ethyl acetate, propyl acetate and butyl acetate may be added and mixed.

The azeotrope-like mixture of the present invention can be used in various applications such as heat transfer, dry cleaning, etc., like conventional fluorocarbons, and is particularly suitable when used as a solvent because it has a higher dissolving power than conventional R113. Specific uses of solvents include removing agents for flux, grease, oil, wax, ink, etc.
Examples include solvents for paints, extractants, stain removers, cleaning agents and draining agents for various articles made of glass, ceramics, plastics, rubber, and metals, especially IC parts, electrical equipment, precision instruments, optical lenses, etc. As a cleaning method, hand wiping, dipping, spraying, shaking, ultrasonic cleaning, steam cleaning, etc. may be employed.

[Example] Example 1 Mixture of the present invention (R-113/methanol/cis-1
, 2-dichloroethylene = 50.0/6.5/43.
A flux cleaning test was conducted using 5% by weight).

Flux was applied to the entire surface of the printed circuit board, baked in an electric furnace at 200° C. for 2 minutes, and then immersed in the mixture of the present invention for 1 minute. A similar test was also conducted for R113 as a comparative example. Table 1 shows the degree of flux removal.

Table 1 0: Can be removed well ○: Good removal Δ: Trace amount remaining
X: Significant residual Example 2 Mixture of the present invention (R-113/methanol/cis-1
, 2-dichloroethylene = 50.0/6.5/43.
A machine oil cleaning test was conducted using 5% by weight).

5O3-304 test piece (25mmX 30mm
X 2 mm thick) was immersed in machine oil and then immersed in the mixture of the present invention for 5 minutes. A similar test was also conducted for R113 as a comparative example. Table 2 shows the degree of machine oil removal.

Table 2: It is better in dissolving and removing flux, oil, etc. than the single substance, so it is suitable as a cleaning solvent to replace R113. 0: Can be removed well ○: Good △: Trace amount remains ×
: Significantly remaining [effects of the invention]

Claims (1)

[Scope of Claims] A fluorinated hydrocarbon azeotrope-like mixture comprising 1,1,1,2-trichlorotrifluoroethane and a binary azeotrope of methanol and cis-1,2-dichloroethylene. 2,1,1,2-trichlorotrifluoroethane 95~
2. A mixture according to claim 1, comprising 20% by weight and 5 to 80% by weight of a binary azeotrope of methanol and cis-1,2-dichloroethylene.