JPH06248294A - Azeotropic and azeotrope-like composition and cleaning agent - Google Patents

Abstract

PURPOSE:To obtain a cleaning agent having greatly cleaning power and excellent drying rate free from destruction of the ozone layer. CONSTITUTION:A cleaning agent comprises an azeotropic and azeotrope-like composition composed of 3-methyl-3-methoxybutyl acetate and octamethyltrisiloxane as active ingredients. Both the compounds contain no halogen, are chemically stable and provides a cleaning agent having excellent drying properties because of being the azeotropic and azeotrope-like composition.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can be used as a substitute for chlorine-based degreasing detergents such as CFCs and trichloroethane, and can be used as precision parts for metal parts such as aluminum and iron, optical parts such as lenses and prisms, and electronic parts. The present invention relates to an azeotropic and azeotrope-like composition that can be suitably used for cleaning, and a cleaning agent therefor.

[0002]

2. Description of the Related Art As a solvent for cleaning optical parts, electronic parts and the like, 1,1,2-trichloro-1,
2,2-trifluoroethane (Freon 113) and trichloroethane are used. This is because Freon 113 is nonflammable; has low toxicity to living organisms; plastic,
It does not corrode polymer materials such as rubber, but has selective solubility that it dissolves fats and oils; it has a fast drying rate; and so on. Trichloroethane also has excellent degreasing and detergency. , Because it is nonflammable.

On the other hand, various mixtures and azeotropic compositions have been developed in order to reduce the use amount of these chlorine-based solvents, to make them incombustible, and to improve the degreasing power. For example, Japanese Patent Laid-Open No. 1-3180
JP-A-94 discloses a mixture of Freon 113, isopropyl alcohol, and methyl ethyl ketone as a cleaning solvent. Further, JP-A-2-289693 discloses an azeotropic composition of dichlorotetrafluoropropane (CFC 234) and an aliphatic lower alcohol such as ethanol. Furthermore, aliphatic lower alcohols such as IPA and ethanol, simple ketones such as acetone, and ethers are also being studied.

[0004]

However, the CFC 11
Chlorine solvents such as 3 and trichloroethane are chemically particularly stable, so they have a long life in the troposphere, diffuse and reach the stratosphere, where the chlorine radicals decomposed by sunlight cause a chain reaction with ozone. There is a need to reduce their use, as they awake and destroy the ozone layer. Therefore, as described above, a chlorine-based solvent such as Freon 113,
We are trying to reduce the amount used by developing an azeotropic composition with organic solvents other than chlorine-based solvents, but since chlorine-based solvents are essential, it is not possible to reduce the amount used to a certain extent. There is. Further, although an azeotropic composition with Freon 234, which has a relatively low ozone depletion property as compared with Freon 113, has been developed, it is impossible to completely eliminate the destruction of the ozone layer. On the other hand, an aliphatic lower alcohol has a problem in drying property, and a ketone-based or ether-based solvent deteriorates an object to be cleaned such as a plastic, so that it is not practical.

The present invention has been made in consideration of these problems, and is an azeotropic and azeotrope-like composition which does not destroy the ozone layer and has excellent cleaning and drying properties.
The purpose is to provide the cleaning agent.

[0006]

The azeotropic and azeotrope-like composition of the present invention comprises 3-methyl-3-methoxybutyl acetate (hereinafter referred to as MMB-Ac) and octamethyltrisiloxane. Consists of. Further, the cleaning agent of the present invention contains the azeotropic and azeotrope-like composition having the above-mentioned constitution as an active ingredient.

Here, MMB-Ac alone is excellent as a detergent because of its strong polarity, but on the other hand, it has a large surface tension of about 29 dyn / cm (25 ° C.) and does not have sufficient permeability. .

On the other hand, octamethyltrisiloxane has 25
It has a viscosity of 0.96 CSt at ℃, its surface tension is small as about 17 dyn / cm (25 ℃) and it has excellent permeability, but its KB value (kauributanol value) is 15. Small and weak cleaning power. In the present invention,
By mixing these MMB-Ac and octamethyltrisiloxane, both advantages are provided. In this case, in order to use it as a cleaning agent, it is necessary that the liquid management at the time of use is easy and that it can be easily recovered and reused. To meet these requirements,
It is not enough to simply mix both, and it is necessary to make the composition have an azeotropic point, that is, an azeotropic state.
The composition in the azeotropic state has a constant boiling point different from the boiling points of the individual components (this boiling point is preferably lower than the individual boiling points of the components), has a higher volatilization rate, and is vaporized. , Its composition or the proportion of distillate hardly change.

In the present invention, under 760 mmHg,
At a composition ratio of MMB-Ac of 13 to 17 wt% and octamethyltrisiloxane of 87 to 83 wt%, an azeotropic state occurs, and in order to obtain the above characteristics, a composition close to this composition ratio is preferable. In the present invention, it is also practical to use an azeotrope-like composition in consideration of the influence of water mixed in from the ambient environment and the influence of impurities contained in MMB-Ac and octamethyltrisiloxane. Is. This azeotrope-like composition can be achieved with a composition ratio of MMB-Ac of 10 to 25 wt% and octamethyltrisiloxane of 90 to 75 wt%.

In the present invention, a stabilizer may be added in addition to the above composition. The stabilizer is required to have a large effect of stabilizing the azeotropic and azeotrope-like composition, but those which are co-distilled by the distillation operation and those which form an azeotrope are preferable. Such stabilizers include aliphatic nitro compounds such as nitromethane, nitroethane and nitrobutane, acetylene alcohols such as 3-methyl-1-butyn-3-ol and 3-methyl-1-pentyn-3-ol, glycidol and methyl. Glycidyl ether,
Epoxides such as allyl glycidyl ether, phenyl glycidyl ether, 1,2-butylene oxide, cyclohexene oxide and epichlorohydrin, ethers such as dimethoxymethane, 1,2-dimethoxyethane, 1,4-dioxene and 1,3,5-trioxene Unsaturated hydrocarbons such as hexene, heptane, octene, 2,4,4-trimethyl-1-pentene, pentadiene, octadiene, cyclohexene, cyclopentene, allyl alcohol, 1-buten-3-ol, 3-methyl- Olefinic alcohols such as 1-buten-3-ol, acrylic acid esters such as methyl acrylate, ethyl acrylate and butyl acrylate, phenol, trimethylphenol, cyclohexylphenol, thymol, 2,6-di- t- butyl-4-methylphenol, butylhydroxyanisole, phenols such as isoeugenol and, hexylamine, Benchiruamin, dipropylamine, diisopropylamine, diisobutylamine, triethylamine, tributylamine,
Pyridine, n-methylmorpholine, cyclohexylamine, 2,2,6,6-tetramethylpiperidine, N,
Amines such as N'-diallyl-p-phenylenediamine, benzotriazole, 2- (2'-hydroxy-
At least one kind or two or more kinds selected from triazoles such as 5′-methylphenyl) benzotriazole and chlorobenzotriazole can be used.

The above-mentioned octamethyltrisiloxane and MMB-Ac of the present invention have low toxicity to living bodies,
Since it is chemically stable and does not contain halogen such as chlorine, it does not affect the ozone layer. The objects that can be cleaned include metal parts such as aluminum and iron, optical parts such as lenses, plastic parts,
It is not limited to a wide range of electronic parts and the like, but is not limited to this. If there is no attack on the base material, it is possible to wash other things.

[0012]

Example 1 The purity of octamethyltrisiloxane available on the market was 9 as a result of gas chromatography analysis.
It is at a level of 8.0% and contains, as impurities, a siloxane or silane compound having a lower molecular weight than octamethyltrisiloxane, a hydrocarbon-based compound that is less volatile than octamethyltrisiloxane, siloxane, and the like. Of these, impurities that are less likely to volatilize than octamethyltrisiloxane may remain as a residue on the object to be cleaned.
Components less volatile than octamethyltrisiloxane were removed by means such as distillation, rectification, and an adsorbent. This octamethyltrisiloxane and MMB-Ac are each 100
Add 200 g of the mixture to a distillation flask and set the number of theoretical plates to 3
Distillation was carried out under normal pressure using a zero-stage rectification column. By this distillation, an azeotropic fraction was obtained at 148 to 150 ° C. About 2 ml of this fraction was collected every 1 minute and analyzed by gas chromatography 10 times. As a result, octamethyltrisiloxane was 87 to 83 wt% and
The composition of B-Ac was 13 to 17 wt%. Table 1 shows octamethyltrisiloxane, MMB-Ac, the surface tension (25 ° C.) and the KB value of the composition of Example 1.

[0013]

[Table 1]

[0014]

[Example 2] A glass lens and an aluminum plate were used as objects to be cleaned, and as stains, centering oil (trade name "Yushiron CG" (manufactured by Yushiro Kagaku)) was used for the glass lens, and cutting oil (product The name "Cut 201A" (manufactured by Mitsubishi Petroleum Co., Ltd.) was applied and washed by the following procedure: The composition obtained in Example 1 was filled in the first tank kept at room temperature, and at 300 W, 28 KHz. After degreasing the object to be cleaned while applying ultrasonic waves, the second tank at room temperature was filled with the composition obtained in Example 1 and degreased again while applying ultrasonic waves at 300 W and 28 KHz. Three tanks were filled with the composition obtained in Example 1, and after ultrasonic waves were applied at 300 W and 28 KHz, they were blown with cold air and dried to observe the finished state after washing. The contact angle was measured, and Comparative Example And it was washed and dried in a similar procedure with trichloroethane and was performed also compared with its wash. Table 2 shows the results.

[0015]

[Table 2]

[0016]

As described above, the azeotropic and azeotrope-like compositions of the present invention do not destroy the ozone layer, have no composition change due to evaporation, and have an excellent drying rate. It can be usefully used as a cleaning agent.

Claims (2)

[Claims] 1. An azeotropic and azeotrope-like composition comprising 3-methyl-3-methoxybutyl acetate and octamethyltrisiloxane. 2. A detergent comprising an azeotropic and azeotropic composition comprising 3-methyl-3-methoxybutylacetate and octamethyltrisiloxane as an active ingredient.