JPH02209835A - Azeotropic mixture and azeotrope-like mixture of 1-chloro-2,2,3,3-tetrafluoropropane - Google Patents

Abstract

PURPOSE:To obtain the subject mixture having excellent characteristics comparable or superior to those of conventional fluorocarbons and suitable as a fluorocarbon substitute by using R244ca, R225ca and trans-1,2-dichloroethylene as essential components. CONSTITUTION:The objective azeotropic mixture is composed of (A) 11wt.% of 1-chloro-2,2,3,3-tetrafluoropropane (R244ca), (B) 47wt.% of 1,1-dichloro-2,2,3,3,3- pentafluoropropane (R225ca) and (C) 42wt.% of trans-1,2-dichloroethylene and the azeotrope-like mixture is composed of 3-69wt.% of A, 8-78wt.% of B and 3-54wt.% of C, preferably 6-36wt.% of A, 42-72wt.% of B and 5-47wt.% of C. The mixture has azeotropic point, causes little variation of composition in recycling and can be used in similar manner as conventional simple fluorocarbon. It has higher dissolving power than conventional R113 when used especially as a solvent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a novel fluorinated hydrocarbon azeotrope and azeotrope-like mixture that can be used as a CFC substitute and has excellent properties as a solvent, etc. .

[Prior art] Fluorinated hydrocarbon compounds (hereinafter simply referred to as fluorocarbons) are often less toxic and chemically stable, and various types of fluorocarbons with different standard boiling points are available. 1.1.2-Trichloro-1,2,2-)lifluoroethane (R113) is used as a blowing agent, propellant, or refrigerant, and trichloromonofluoromethane (R1-1) is used as a blowing agent, propellant, or refrigerant. Dichlorodifluoromethane (R12) is used.

[Problem to be solved by the invention] Old 1, R12, and R113, which are particularly chemically stable, have a long life in the troposphere and diffuse into the stratosphere, where they are decomposed by sunlight and generate chlorine radicals. Regulations on the use of these conventional fluorocarbons have been implemented because they are said to cause a chain reaction with ozone and destroy the ozone layer. The search for alternative CFCs is actively underway.

An object of the present invention is to provide a mixture containing a novel hydrogen-containing chlorofluoropropane-based fluorocarbon with a carbon number of 3, which has various excellent properties equivalent to conventional fluorocarbons and is useful as an alternative fluorocarbon. It is something.

[Means for Solving the Problems] The present invention provides 1-chloro-2,2,3,3-tetrafluoropropane (R244Ca), 1,1-dichloro-2,2
,3,3,3-pentafluoropropane (R225ca
), and trans-1,2-dichloroethylene. The mixture of the present invention has an azeotropic composition, and is particularly useful as a cleaning solvent when compared to conventional R113 alone. Because of its high detergency, it is extremely useful as a substitute for R113.

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

The mixture of the present invention contains 3 to 69% by weight of R244ca.
, R225ca is 8-78% heavy view and trans-1
, 2-dichloroethylene is 3 to 54% heavy, or R244ca is 6 to 36% heavy, 225ca is 42
The azeotropic composition of the present invention is R
244ca, about 47% by weight of R225ca, and about 42% by weight of trans-1,2-dichloroethylene.

Other components may be further added to the mixture of the present invention depending on the application.
, 3-dimethylbutane, hydrocarbons such as cyclopentane, nitroalkanes such as nitromethane, nitroethane, nitropropane, diethylamine, triethylamine,
Amines such as isopropylamine, butylamine, isobutylamine, alcohols such as methanol, ethanol, n-propyl alcohol, i-propyl alcohol, n-butyl alcohol, i-butyl alcohol, S-butyl alcohol, t-butyl alcohol, Ethers such as methyl cellosolve, tetrahydrofuran, 1,4-dioxane, ketones such as acetone, methyl ethyl ketone, methyl butyl ketone, ethyl acetate, propyl acetate,
Esters such as butyl acetate, dichloromethane, cis-
Halogenated hydrocarbons such as 1,2-dichloroethylene and 2-bromopropane, others, 1,1-dichloro-1-
Fluorocarbons other than those of the present invention, such as fluoroethane, can be added as appropriate.

R244ca, R225ca and trans-1
, 2-dichloroethylene, the azeotrope and azeotrope-like mixture of the present invention can be used in various applications such as heat carriers and blowing agents, similar to conventional fluorocarbons, and especially when used as a solvent, has a higher solubility than conventional R113. It is suitable because it has power.

Specific uses of solvents include flux, grease,
Removers for oil, wax, ink, etc., paint solvents, extractants, cleaning agents and draining agents for glass, ceramics, plastics, rubber, various metal products, especially IC parts, electrical equipment, precision machinery, optical lenses, etc. can be mentioned. As cleaning methods, hand wiping, dipping, spray shaking, ultrasonic cleaning, steam cleaning, etc. may be used.

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

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%) R244ca
(Boiling point 54℃) 10 R225ca (Boiling point 51.3℃) 50trans-1
,2-dichloroethylene 40 (boiling point 47.7°C) As a result, 390 g of a fraction was obtained. As a result of measuring this product with a gas chromatograph, it had the following composition.

(Composition) (Weight%) R244ca
11R225ca
47 trans-1,2-dichloroethylene 42 Example 2 Mixture of the present invention (R244ca, /R,225ea/1
rans-1,2-dichloroethylene-11% by weight/4
A machine oil cleaning test was conducted using 7% by weight/42% by weight).

5O3-304 test piece (25+wmX 30m
mX 2++n thickness) with 81 machine oil (Nippon Oil CQ-30
> immersed in the mixture of the invention for 5 minutes. As a result, it was confirmed that machine oil could be removed as well as R113.

Example 3 Mixture of Example 2 (R244ca/R225ca/1r
ans-1,2-dichloroethylene = 11% by weight/47
A flux cleaning test was conducted using a flux (% by weight/42% by weight).

Flux (Ar manufactured by Tamushi Seisakusho) is applied to the entire printed circuit board.
-AL-4) was applied, baked for 2 minutes in an electric furnace at 200°C, and then immersed in the mixture of the present invention for 1 minute. the result,
It was confirmed that flux could be removed well.

[Effects of the Invention] The fluorinated hydrocarbon mixture of the present invention has properties equivalent to or superior to those of conventional fluorocarbons. It also has the advantage of having an azeotropic point, having little compositional variation during recycling, and can be used in the same way as conventional single fluorocarbons, and can be applied as is without requiring major changes to conventional technology.

Agent (patent attorney) Half-h Furina

Claims (1)

[Claims] 1,1-chloro-2,2,3,3-tetrafluoropropane, 1,1-dichloro-2,2,3,3,3-pentafluoropropane, and trans-1,2 -A fluorinated hydrocarbon azeotrope consisting of dichloroethylene. 2,1-chloro-2,2,3,3-tetrafluoropropane 11% by weight, 1,1-dichloro-2,2,3,3,
47% by weight of 3-pentafluoropropane, and tran
A mixture according to claim 1, consisting of 42% by weight of s-1,2-dichloroethylene. Fluorination consisting of 3,1-chloro-2,2,3,3-tetrafluoropropane, 1,1-dichloro-2,2,3,3,3-pentafluoropropane, and trans-1,2-dichloroethylene Hydrocarbon azeotrope-like mixture. 4,1-chloro-2,2,3,3-tetrafluoropropane 3-69% by weight, 1,1-dichloro-2,2,3,
3,3-pentafluoropropane 8-78% by weight, and trans-1,2-dichloroethylene 3-54% by weight
A mixture according to claim 3 consisting of.