JPH02215737A - Fluorinated hydrocarbon-based mixed composition - Google Patents

Abstract

PURPOSE:To obtain a fluorinated hydrocarbon-based mixed composition, consisting of 1,1,2-trifluoroethane and tert-butyl chloride, usable as a substitute fluorocarbon for various applications, such as heating medium or foaming agent, and especially having excellent characteristics as a solvent. CONSTITUTION:The above-mentioned composition, obtained by blending (A) 60-95wt.%, preferably 80-90wt.% 1,1,2-trichlorotrifluoroethane with (B) 5-40wt.%, preferably 10-20wt.% tert-butyl chloride as essential components [the azeotropic composition is especially about 85wt.% component (A) and about 15wt.% component (B)], capable of reducing the amount thereof while satisfying excellent characteristics of conventional fluorocarbons and providing the same usage as that of the conventional single fluorocarbon due to the presence of the azeotropic composition and hardly any fluctuation of composition even in recycling. Since properties of dissolving and removing fluxes, oils, etc., are especially better than those of simple R113, the aforementioned incombustible or flame retardant composition is suitable as a detergent solvent substitute for the R113.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J The present invention relates to a novel fluorinated hydrocarbon mixed composition that can be used as a fluorocarbon 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, and various fluorocarbons with different standard boiling points are available, so they can be used to take advantage of these characteristics. Various types of fluorocarbons are used as solvents, blowing agents, propellants, refrigerants, etc. For example, 1,1,2-trichloro-1,2,2-trifluoroethane (R113) is used as a solvent, trichloromonofluoromethane (R11) is used as a blowing agent, and dichlorodifluoromethane (R12) is used as a propellant or refrigerant. It is used.

[Problems 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, which cause 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 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 1,1,2-trichlorotrifluoroethane (
The present invention relates to a fluorinated hydrocarbon mixed composition comprising R113) and tert-butyl chloride. The composition of the present invention is nonflammable or flame retardant, has an azeotropic composition, and has higher detergency as a cleaning solvent than conventional R113 alone, so it is extremely useful as a substitute for R113.

Furthermore, the composition of the present invention 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 in conventional technology. 60-95% by weight of R113 and chloride-
5 to 40% by weight of tert-butyl, preferably R11
3 is 80-90% by weight and tert-butyl chloride is 1
0 to 20% by weight, more preferably an azeotropic composition consisting of about 85% by weight of R113 and about 15% by weight of tert-butyl chloride.

Other components may be further added to the composition of the present invention depending on the intended use. For example, when used as a solvent, hydrocarbons such as pentane, impentane, hexane, isohexane, heptane, and isohbutane,
Nitroalkanes such as nitromethane, nitroethane, nitropropane, diethylamine, triethylamine, isopropylamine, butylamine, isobutylamine,
Amines such as methanol, ethanol, n-propyl alcohol, i-propyl alcohol, n-butanol, alcohols such as i-butanol, ethers such as methyl cellosolve, tetrahydrofuran, 1,4-dioxane, acetone, methyl ethyl ketone , ketones such as methyl butyl ketone, and esters such as ethyl acetate, propyl acetate, butyl acetate, and the like can be added and mixed.

Additionally, if it is necessary to stabilize the composition of the present invention,
As stabilizers, nitro compounds, phenols, amines, ethers, amicins, esters, organic phosphites, epoxides, furans, alcohols,
At least one member selected from the group of ketones and triazoles can be added. As for the added weight,
Although not particularly limited, 1 ppm to mixed composition
10%, preferably loppm to 5%, more preferably toopp to 3%.

The mixed composition of the present invention consisting of R113 and tert-butyl chloride can be used for various purposes such as heat carriers and blowing agents, similar to conventional fluorocarbons, and especially when used as a solvent, it has a higher dissolving power than conventional R113. It is suitable because of its high value. Specific uses of solvents include flux, grease, oil,
Examples include removers for wax and ink, solvents for paints, extractants, cleaning agents and draining agents for glass, ceramics, plastics, rubber, various metal products, especially IC parts, electrical equipment, precision machinery, optical lenses, etc. I can do it. As the cleaning method, hand wiping, dipping, spraying, shaking, ultrasonic cleaning, steam cleaning, etc. may be employed.

[Examples] Example 1 1000 g of a solvent mixture having the following composition was placed in a distillation flask and distilled under atmospheric pressure using a rectification column with 20 theoretical plates.

(Composition) (Weight g) RL13 (Boiling point 47.6°C) 600 chloride-ter
t-Butyl (boiling point 50.7°C) 400 Result 46.5
200g of fraction was obtained at . As a result of measuring this product with a gas chromatograph, it had the following composition.

(Composition) (% by weight) R11385 Tert-butyl chloride 15 Example 2 Composition of the present invention (R113/tert-butyl chloride=
85/15% by weight) was used to conduct a machine oil cleaning test.

5O3-304 test piece (25mm x 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 1 shows the degree of machine oil removal.

It has advantages such as not having Table 1. Furthermore, it is suitable as a cleaning solvent in place of R113 because it has better ability to dissolve and remove flux, oil, etc. than R113 alone, which is often used as a solvent.

0: Can be removed well ○: Good Δ: Trace amount remains
×; Significantly remaining [effect of invention]

Claims (1)

[Claims] A fluorinated hydrocarbon mixed composition comprising 1,1,1,2-trichlorotrifluoroethane and tert-butyl chloride. 2,1,1,2-trichlorotrifluoroethane 60~
A fluorinated hydrocarbon mixed composition consisting of 95% by weight and 5 to 40% by weight of tert-butyl chloride.