JPH02289695A - solvent - Google Patents

Abstract

PURPOSE:To obtain an azeotropic solvent composition, composed of dichlorotetrafluoropropane, having low biological toxicity and ozone destroying properties with incombustibility and chemical stability and excellent in selective solubility in waxes, etc. CONSTITUTION:The objective composition composed of preferably a simple component or azeotropic composition of dichlorotetrafluoropropane consisting of 1,1-dichloro-2,2,3,3-tetrafluoropropane, 2,2-dichloro-1,1,3,3-tetrafluoropropane, 2,3-dichloro-1,2,3,3,-tetrafluoropropane, etc. The above-mentioned composition is suitable as a detergent, removing agent, dispersion medium for ceramics or metal powder, water draining drying agent, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a solvent consisting of dichlorotetrafluoropropane.

[Conventional technology]

CFC-113, a chlorofluoroethane-based compound, is nonflammable and has low biological toxicity, and has excellent selective solubility that dissolves oils, fats, grease, wax, etc. without attacking polymeric substances such as plastics and rubber. It has been widely used as a solvent, a cleaning agent, etc., either alone or in the form of a mixture with other organic solvents, or in the form of an azeotropic composition.

On the other hand, dichlorotetrafluoroborban (hereinafter referred to as ICP)
C-234) is a conventionally known compound, but it has not been used as a solvent.

[Problem to be solved by the invention]

In recent years, environmental pollution has become an issue on a global scale as chlorofluoroethane compounds such as CPC-113, in which all hydrogen has been replaced with chlorine and fluorine (hereinafter referred to as bar-yachiethane), destroy the ozone layer surrounding the earth. There is an urgent need to reduce the use of bar-haloethane.

Therefore, various substances are being considered to replace CPC-113, but in order to use it as a solvent, it is important that the liquid is easy to manage during use, and that it can be easily recovered and reused, and it is also possible to steam clean it. It is necessary to satisfy various requirements, such as the desire to use the same method, and no effective substitute has yet been found.

[Means to solve the problem]

The present invention provides CFC-113 with wax cleaning properties, nonflammability,
It has the same or better performance in terms of low toxicity and chemical stability, does not affect plastics, rubber, metals, etc., has selective solubility that can only clean and remove stains caused by wax, etc., and CFC- This was developed to provide a solvent with less ozone layer depleting properties compared to No. 113, and relates to a solvent made of dichlorotetrafluoropropane.

[Function and Examples]

IIcFc-234 used in the present invention is nonflammable, has low toxicity to living organisms, is chemically stable, and can be selectively dissolved to clean and remove only dirt such as oil and fat without affecting plastics, rubber, metals, etc. Having sex and CF
It is a solvent with less ozone layer depletion than C-113. Therefore, CFC-113 can be used in applications where CFC-113 has traditionally been used, such as as a degreasing agent for paraffin, animal and vegetable oils, and processing oils, removing flux from printed circuit boards, and cutting and polishing silicon wafers, crystals, and ceramics used in semiconductors. As a cleaning agent for removing temporary fixing waxes during processing, adhesive tapes, paints, inks, etc., as well as solvents and diluents for paints and inks, dispersion medium for ceramics and metal powders, and water drainer. It is useful as a desiccant. Furthermore, it can be used as a heating medium, an insulating agent, a pressure medium, etc.

The ICFC-234 includes, for example, 1,1-dichloro2.2.3.3-tetrafluoropropane (bp 7
7.5℃), 1,1-dichloro-1.3.3.3-tetrafluoropropane (bp 87℃), 1,2-dichloro-1.2,3.3-tetrafluoropropane (b
p7B”C), 1,3-dichloro2.2.3.3
-Tetrafluoropropane (bp 8g°C') (}I
CFC-243cc), 1,2-dichloro2.3,
3.3-Tetrafluoropropane (bp 84°C) (I
CFC-234bb), 2,2-dichloro1.1.
3.1-Tetrafluoropropane (bp74℃), 2
．． 2-dichloro2.2.3.3-tetrafluoropropane (bp 70°C), 2.3-dichloro1.2
．． 3.3-tetrafluoroborban (bp 71°C)
, 3.3-dichloro-1.2,2.3-tetrafluoroborban (bp73°C), 1.1-dichloro-2.3
．． 3.3-tetrafluoroborban (bp 70°C)
, 1.2-dichloro-1.3.3.3-tetrafluoropropane (bp 70°C), 1.3-dichloro-1.
2,3.3-tetrafluoropropane (bp 71°C),
1,3-dichloro 1.2, 2,3-tetrafluorobroban (bp yo℃'), 2,3-dichloro 1
,l. 3.3-tetrafluoroborban (bp 72°C
), 3.3-dichloro1.1.2.3-tetrafluoropropane (bpI4°C), 1.3-dichloro1
．． 1. 3.3-tetrafluoroborban (bp 47
C) (ICFC-234fa).

These may be used singly or as a mixture of two or more, but include chlorinated hydrocarbons, alcohols,
It may be used in combination with ketones, petroleum solvents, etc. Above all, from the viewpoint of ease of liquid management during normal use, it is preferable to use a single component or an azeotropic composition.

Since HCPC-234 is chemically stable to the same extent as CFC-11, it can be used as it is, but a stabilizer may be added thereto.

Specific examples of the above-mentioned stabilizers include aliphatic nitro compounds such as nitromethane, nitroethane, and nitroproban, 3-methyl-■-butyn-3-ol,
- Acetylene alcohols such as methyl-1-bentin-3-ol, eboxides such as glycidol, methyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether, 1,2-butylene oxide, cyclohexene oxide, and shrimp chlorohydrin , dimethoxymethane, l,2-dimethoxyethane, 1,4-dioxane, ethers such as 1.3.5-}lioxane, hexene, hebutene, octene, 2,4.4-}limethyl-1-bentene, pentadiene , 1 Unsaturated hydrocarbons such as octadiene, cyclohexene, and cyclopentene, allyl alcohol, ■-buten-3-ol, 3
- Olefinic alcohols such as methyl-1-buten-3-ol, methyl acrylate, ethyl acrylate,
Examples include acrylic esters such as butyl acrylate, and these may be used alone or in combination of two or more. In addition, these and phenol, trimethylphenol, cyclohexylphenol, thymol, 2.6-
Phenols such as di-t-butyl-4-methylphenol, butylhydroxyanisole, isoeugenol, hexylamine, pentylamine, dibropylamine, diisobutylamine, diisobutylamine, triethylamine, tributylamine, viridine, N-methylmorpholine, cyclohexylamine , 2, 2, 6.8
-tetramethylbiperidine, N,N'-diaryl p-
Amines such as phenylenediamine, penzotriazole, 2-(2”-hydroxy-5°-methylphenyl)
It may be used in combination with triazoles such as penzotriazole and chlorobenzotriazole, and when used in combination, an even more excellent synergistic stabilizing effect can be exhibited.

Preferred as such a stabilizer is 11cPc-
Of course, it is highly effective in stabilizing 234, but it is also a substance that is entrained in distillation operations,
Furthermore, those that form an azeotrope are desirable, but are not limited to these. Specific examples of preferred stabilizers include nitromethane and a combination system of nitromethane and other stabilizers.

The amount of the stabilizer to be used cannot be determined unconditionally since it varies depending on the type of stabilizer, but it is usually determined according to ICPC-23.
It is preferable to use 0.1-10% by weight based on 4.
．． It is more preferable to use 5 to 5% by weight.

When the solvent of the present invention is used, for example, as a cleaning agent, as mentioned above, it has low biotoxicity, good degreasing and cleaning properties, and is as effective against plastics, rubber, metals, etc. as CFC-113. Since it has little impact, the object to be cleaned can be washed completely, and it is chemically stable and has an appropriate boiling point for distillation recovery, so liquid management, recovery, and reuse are easy, and it can also be applied to steam cleaning. . Furthermore, a remarkable effect is achieved in that global environmental pollution such as destruction of the ozone layer is less likely to occur.

Next, the solvent of the present invention will be explained with reference to Examples, but the present invention is not limited to these Examples.

Example 1 and Comparative Example 1 Bolts and nuts (M5) 1 with spindle oil attached
00g is immersed in 500ml of the solvent shown in Table 1,
After applying ultrasonic waves for 60 seconds, remove 500 of the solvent from another tank.
A degreasing cleaning test was conducted by immersing the sample in ml for 60 seconds followed by steam cleaning for 60 seconds. Thereafter, the amount of oil remaining in the bolts and nuts was measured using an oil concentration meter (manufactured by Horiba, Ltd.).

The results are shown in Table 1.

Example 2 and Comparative Example 2 10CIIXIOCI+ printed circuit board was coated with Tamura Seisakusho's flux (F-200V) and heated at 250°C.
Soldering (63Sn) was performed. Next, a flux cleaning test was conducted by immersion cleaning for 1 minute at the boiling point using the solvent (1 g) shown in Table 1. After that, the ionic residue was filtered using Omegameter 500 (manufactured by Kenko Corporation).
Measured using The results are shown in Table 1.

Example 3 and Comparative Example 3 In order to investigate the influence of solvents on polymeric materials, a plastic test piece (5 m x 50 g x 2 layers) shown in Table 1 was immersed in 100 g of the solvent shown in Table 1. It was left in a constant temperature bath at ℃ for 4 hours. Thereafter, it was taken out, and weight changes and volume changes were immediately examined and evaluated according to the following criteria.

The results are shown in Table 1.

(Evaluation criteria for impact on plastics) ◎: Weight or volume increase θ ~ less than 2% O: Weight or volume increase 2-5% or more Δ: Weight or volume increase 5% or more [blank below] In addition, other ICFC- Regarding the isomer of 234, almost the same results as in Table 1 were obtained.

〔Effect of the invention〕

The solvent of the present invention has low biotoxicity, cpc-113
Selective dissolution that has performance equivalent to or superior to wax cleaning properties, nonflammability, low toxicity, chemical stability, etc., and can clean and remove only wax stains without affecting plastics, rubber, metals, etc. It is a solvent with low ozone layer depleting properties compared to CFC-113.

The solvent of the present invention can also be suitably used as a diluent, a remover, a dispersion medium for ceramic or metal powder, and a draining and drying agent.

Claims (1)

[Claims] 1 A solvent consisting of dichlorotetrafluoropropane.