JPH05124990A - Azeotropy-like composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition comprising a highly brominated hydrocarbon as a base, having azeotropic behavior or a behavior close to azeotropic behavior and excellent characteristics as a detergent by blending decafluoropentane with chlorobutane. CONSTITUTION:(A) 85-99wt.% 1,1,1,2,3,4,4,5,5,5-decafluoropentane is mixed with 15-1wt.% 1-chlorobutane, otherwise (B) 75-99wt.% 1,1,1,2,3,4,4,5,5,5- decafluoropentane is mixed with 25-1wt.% 2-chlorobutane, and optionally a stabilizersuch as a nitroalkane (preferably 0.05-0.5wt.%) to give the objective composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly fluorinated hydrofluorocarbon-based composition exhibiting azeotropic or similar behavior. More specifically, it is preferably used for degreasing and cleaning of grease and processing oil used for metal parts for processing and rust prevention, and flux removal during semiconductor manufacturing, as well as a foaming agent, working medium,
The present invention relates to an azeotropic composition capable of substituting for applications such as electrical insulating agents.

[0002]

BACKGROUND OF THE INVENTION Chlorofluorocarbons are widely used as solvents, foaming agents, refrigerants, etc. for cleaning semiconductor products such as flux removal, because they are less toxic, flame-retardant and chemically and thermally stable. Is a chlorofluorocarbon-based solvent, 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113, boiling point about 48 ° C), or a chlorine-based solvent, 1,1,
1-Trichloroethane etc. were used.

[0003]

[Problems to be Solved by the Invention] However, from the perspective of protecting the ozone layer, CFC-11 (trichlorofluoromethane) and CFC-12 (dichlorodifluoromethane) are also used in Japan based on the Vienna Convention (1985) and the Montreal Protocol (1987). For chlorofluorocarbons such as methane), CFC-113, CFC-114, CFC-115, etc., production volume reduction and usage restrictions were implemented. In addition, it has been pointed out that the chlorine-based solvent is also carcinogenic, and there are problems such as groundwater pollution, and its use is being regulated. Therefore, the present invention aims to provide a composition which does not have a risk of depleting the ozone layer, does not have a problem of carcinogenicity, and is azeotropic or has a behavior close to that based on a novel chlorine-free hydrofluorocarbon. And

[0004]

The azeotrope-like composition according to the present invention comprises decafluoropentane and chlorobutane, preferably 85-99% by weight of 1,1,1,2,3,4,4, 5,5,5-
Decafluoropentane (hereinafter referred to as HFC-43-10mee) and 15
~ 1% by weight 1-chlorobutane, or 75 ~
It is characterized by comprising 99% by weight of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and 25 to 1% by weight of 2-chlorobutane.

HFC-43-10mee used in the examples has a boiling point of 5
It was 4.7 ° C. Commercially available solvent-grade 1-chlorobutane or 2-chlorobutane can be used.

Since the composition of the present invention is a composition which exhibits azeotropic behavior or a behavior close to it, the characteristics of the composition can be maintained because the composition does not change much even if a distillation operation is carried out in the use process. It is convenient for the recovery and reuse of substances, and the solubility of hydrocarbons is improved as compared with the case of decafluoropentane alone.

In the azeotrope-like composition of the present invention, nitroalkanes, epoxides, furans, which have been conventionally used as stabilizers for chlorofluorocarbons, if necessary,
At least one selected from benzotriazoles, phenols, amines, and phosphates may be contained. The amount of the stabilizer compounded is 0.01 to 5% by weight, preferably 0.05 to 0.5% by weight, based on the azeotropic composition.

Specifically, as a cleaning agent application, a cleaning agent for metal parts, plastic parts, rubber products, precision machine parts and electronic parts combining these for removing contaminants such as flux, oil and buffing agent. Also used as a cleaning agent for dry cleaning. When used as a cleaning agent, wipe with normal temperature cleaning method, dip, brush wash,
Flashing, spraying, ultrasonic cleaning, immersion in a boiling state by a heating cleaning method, steam rinsing, steam cleaning, etc. can be applied, and it is more effective to combine them.

The azeotrope-like composition of the present invention can be used for various purposes such as a foaming agent, a working medium, a solvent for fluoropolymer polymerization, an electric insulating agent, etc., as well as a conventional CFC.

The present invention will be described in detail below with reference to examples.

[0011]

Example 1 Flask equipped with a reflux condenser (300 ml)
In addition, a mixture of HFC-43-10mee and 1-chlorobutane, the concentration of 1-chlorobutane (manufactured by Wako Pure Chemical Industries) was previously adjusted to about 7
0 g was put and it was boiled with a heater. After about 20 minutes, when the temperature became constant, the composition of the liquid phase and the gas phase in the flask was analyzed by gas chromatography (Shimadzu Corporation: GC-14A), and the gas phase temperature at that time was measured. The above test was repeated with different concentrations of 1-chlorobutane. The test results are shown in Table 1. HFC-43-10mee obtained from the results in Table 1
The vapor-liquid equilibrium curve of the mixed composition of chlorobutane and chlorobutane is shown in FIG.

[Table 1]

As is clear from Table 1 and FIG. 1, HFC-43
The mixture of -10mee and 1-chlorobutane has HFC-43-10mee of 75-
99% by weight, 25-1% by weight of 1-chlorobutane, especially
85-99% by weight of HFC-43-10mee, 15-1 of 1-chlorobutane
In the range of wt%, the boiling point is almost constant, the compositions of the gas phase and the liquid phase are almost the same, and the composition is an azeotropic composition. HFC-43
-10mee less than 75% by weight 1-chlorobutane 25% by weight
The larger the amount, the larger the difference in the composition of the gas-liquid phase.

[0013]

Example 2 Flask equipped with a reflux condenser (300 ml)
In addition, about 7 parts of a mixed solution of HFC-43-10mee and 2-chlorobutane, in which the concentration of 2-chlorobutane (manufactured by Wako Pure Chemical Industries) was adjusted in advance.
0 g was put and it was boiled with a heater. After about 20 minutes, when the temperature became constant, the composition of the liquid phase and the gas phase in the flask was analyzed by gas chromatography (Shimadzu Corporation: GC-14A), and the gas phase temperature at that time was measured. The above test was repeated with different concentrations of 1-chlorobutane. The test results are shown in Table 2. HFC-43-10mee obtained from the results in Table 2
The vapor-liquid equilibrium curve of the mixed composition of chlorobutane and chlorobutane is shown in FIG.

[Table 2]

As is clear from Table 2 and FIG. 2, HFC-43
HFC-43-10mee is 75 ~ for mixed liquid of -10mee and 2-chlorobutane
99% by weight, in the range of 25 to 1% by weight of 2-chlorobutane, especially
HFC-43-10mee 80-99% by weight, 2-chlorobutane 20-1
In the range of wt%, the boiling point is almost constant, and the compositions of the gas phase and the liquid phase are almost the same, and the composition is obviously an azeotrope-like composition. When HFC-43-10mee is less than 75% by weight and 2-chlorobutane is more than 25% by weight, the difference in composition of gas-liquid phase becomes large.

[0015]

[Example 3] HFC-43-10mee was added to a sample bottle (20 ml).
9.5 g and 1-chlorobutane 0.5 g are taken and mixed at room temperature, and a refrigerating machine oil (Atmos HAB15F: made by Nippon Oil Co., Ltd.)
0.1 g was added, and the mixture was shaken by hand at room temperature and stirred. Refrigerating machine oil was uniformly dissolved in the mixed composition.

[0016]

[Example 4] HFC-43-10mee was added to a sample bottle (20 ml).
8.5 g and 1.5 g of 2-chlorobutane are taken and mixed at room temperature, and the refrigerating machine oil (Atmos HAB15F: made by Nippon Oil Co., Ltd.)
0.1 g was added, and the mixture was shaken by hand at room temperature and stirred. Refrigerating machine oil was uniformly dissolved in the mixed composition.

[0017]

[Comparative Example 1] HFC-43-10mee was added to a sample bottle (20 ml).
Weigh 10 g of the oil and put it in the refrigerator oil (Atmos HAB1
5F: manufactured by Nippon Oil Co., Ltd.) (0.1 g) was added, and the mixture was shaken by hand at room temperature and stirred, and after standing, two layers were separated.

[0018]

EFFECTS OF THE INVENTION The composition of the present invention has a boiling point close to that of CFC-113 (boiling point of about 48 ° C.) as is clear from the examples, and the conventional equipment can be used as it is, and azeotropic or close to it. Since it behaves, liquid management is easy. Further, since it has a higher solubility in oils and fats than HFC-43-10mee alone, it is useful for degreasing and cleaning grease and processing oils used for metal parts for processing and rust prevention, and flux removal during semiconductor manufacturing.

[Brief description of drawings]

FIG. 1 is a view showing a gas-liquid equilibrium curve of a mixed detergent composition of HFC-43-10mee and 1-chlorobutane.

FIG. 2 is a view showing a gas-liquid equilibrium curve of a mixed detergent composition of HFC-43-10mee and 2-chlorobutane.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C23G 5/028 7308-4K // H05K 3/26 6736-4E

Claims (3)

[Claims] 1. An azeotropic composition comprising decafluoropentane and chlorobutane. 2. The composition according to claim 1, which comprises 85 to 99% by weight of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and 15 to 1% by weight of 1-chlorobutane. An azeotropic composition. 3. The composition according to claim 1, which comprises 75 to 99% by weight of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and 25 to 1% by weight of 2-chlorobutane. An azeotropic composition.