JP3194622B2 - Azeotropic or azeotrope-like composition and dry liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be used as a substitute for chlorofluorocarbons and has excellent properties as a finishing liquid for hand-wiping various products and parts or as a finishing liquid for precision cleaning of optical parts and electronic parts. It relates to an azeotropic or azeotrope-like composition and a drying liquid.

[0002]

2. Description of the Related Art Conventionally, 1,1,2-trichloro-1,2,2-trifluoroethane (Freon 113) has been used as a solvent for cleaning optical parts and electronic parts, and a drying liquid. I have. This is because Freon 113 is nonflammable;
This is because it has excellent properties such as low toxicity to living organisms; does not corrode polymer materials such as plastic and rubber, but has selective solubility of dissolving fats and oils; and has a high drying rate.

On the other hand, various mixtures and azeotropic compositions have been developed in order to reduce the amount of CFC 113 used, make it incombustible, and improve the degreasing power. For example, Japanese Patent Application Laid-Open No. 1-318094 discloses a mixture of Freon 113, isopropyl alcohol and methyl ethyl ketone as a cleaning solvent. JP-A-2-289693 discloses an azeotropic composition of dichlorotetrafluoropropane (fluorocarbon 234) and an aliphatic lower alcohol such as ethanol. Further, aliphatic lower alcohols such as IPA and ethanol, ketones such as acetone alone, and ethers are also being studied.

[0004]

However, Freon 11
Perhaloethane such as 3 has a particularly long life in the troposphere because it is chemically particularly stable, and diffuses into the stratosphere, where chlorine radicals generated by decomposition by sunlight cause a chain reaction with ozone, resulting in an ozone layer. Therefore, there is a demand for reducing these uses. For this reason, as described above, the azeotropic composition of Freon 113 and an organic solvent other than perhaloethane has been developed to reduce the amount of use thereof. There is a problem that cannot be reduced to some extent. Further, an azeotropic composition with chlorofluorocarbon 234, which has a relatively small destruction property of the ozone layer as compared with chlorofluorocarbon 113, has been developed, but destruction of the ozone layer cannot be completely eliminated. On the other hand, aliphatic lower alcohols, ketones or ethers have a problem of toxicity to living organisms, and may impair the health of workers.

The present invention has been made in consideration of these problems, and does not destroy the ozone layer, does not attack materials such as plastic, is excellent in safety, and has excellent drying speed. It is an object of the present invention to provide an azeotropic or azeotrope-like composition and a dried liquid.

[0006]

The azeotropic composition or azeotropic composition of the present invention comprises hexamethyldisiloxane and methanol or hexamethyldisiloxane and 2-
And propanol.

Hexamethyldisiloxane has the chemical formula (CH
₃ ) ₃ SiOSi (CH ₃ ) ₃ having a viscosity of 0.65 CSt (25 ° C.) is used. An azeotropic composition cannot be obtained merely by mixing two or more components, but has an azeotropic point, that is, an azeotropic composition. Such azeotropic compositions exhibit a constant boiling point below the boiling point of the individual components, which increases the rate of volatilization; the composition or distillate proportion hardly changes as a result of evaporation; Has characteristics. The composition having such an azeotropic state is hexamethyldisiloxane 58.9 to 59.3 wt%, methanol 40.7
４41.1 wt%, and with this composition,
The boiling point is 58.7 ° C., which is lower than the boiling point of each component, so that the volatility is improved, and the evaporation composition and the liquid composition hardly change. Therefore, there is almost no change in the composition due to evaporation, and a stable liquid composition is obtained. The composition having an azeotropic state in the 2-propanol-hexamethyldisiloxane system is 54.1 to 54.5% by weight of hexamethyldisiloxane,
45.5-45.9 wt% of 2-propanol, and its boiling point is 76.4 ° C. lower than the boiling point of each component.
As the volatility improves and the vapor composition and liquid composition hardly change, there is almost no change in composition due to evaporation,
A stable liquid composition results.

On the other hand, hexadimethyldisiloxane 30-
In the range of 95 wt%, methanol in the range of 5 to 70 wt%, hexadimethyldisiloxane in the range of 25 to 95 wt%, and 2-propanol in the range of 5 to 75 wt%, the apparent boiling point is lower than that of each component (for example, hexadimethyl disiloxane). Siloxane 25 wt%, 2-propanol 75 wt
% Boiling point is 77.7 ° C.), there is no significant change in composition due to evaporation, and it can be practically used as a hand wiping finishing liquid or a drying liquid.

Hexamethyldisiloxane, one of the components of the azeotropic composition, has low toxicity to living organisms, is chemically stable, and hardly affects plastics, rubber, metals, glass, and the like. Moreover, since it does not contain halogen such as chlorine, there is no effect on the ozone layer. The other component, methanol or 2-propanol, has a high degreasing power and quickly removes dirt such as oils and fats. Therefore, the azeotropic composition or azeotropic composition composed of such components can be suitably applied as a finishing liquid for hand wiping of parts and a drying liquid for finishing precision cleaning,
When used as a solvent or a drying liquid, liquid management at the time of use is easy, and can be easily collected and reused, and furthermore, steam cleaning becomes possible.

In the present invention, it is possible to add a stabilizer, but the effect of stabilizing the azeotropic composition and the azeotrope-like composition is great, and the azeotropic composition is entrained by distillation or forms an azeotrope. It is desirable that the material has the following properties. Further, in the present invention, a solvent for increasing the dissolving power can be added, and, like the stabilizer, the solvent is preferably one having the property of being entrained and distilled off or forming an azeotrope by a distillation operation. .

[0011]

Example 1 Commercially available hexamethyldisiloxane is purified by distillation, rectification, and adsorbent, and is a hydrocarbon compound that is less volatile than hexamethyldisiloxane mixed as an impurity, and has a viscosity of 1 CSt (25 ° C.). The above siloxane and the like (these impurities may become residues on the finished product) were removed. The purity of hexamethyldisiloxane obtained by this purification was analyzed by gas chromatography and found to be 99.0% or more. The viscosity of this hexamethyldisiloxane is 0.65 CSt (2
5 ° C.).

200 g of a mixture of hexamethyldisiloxane and methanol thus purified in a weight ratio of 1: 1.
Was placed in a distillation flask, and distilled under normal pressure using a rectification column having 30 theoretical plates. 58.7 ° C. by this distillation
, An azeotropic distillate was obtained. When this fraction was analyzed by gas chromatography, it was found that hexamethyldisiloxane had a composition of 58.9 to 59.3 wt% and methanol had a composition of 40.7 to 41.1 wt%. Also,
As an azeotropic composition, hexamethyldisiloxane 30 to
A composition of 95% by weight and 5 to 70% by weight of methanol was prepared.

In the present embodiment, a stabilizer and / or a solvent can be added to the azeotropic composition and the azeotropic composition prepared by the above method. As the stabilizer, for example, at least one selected from ethers such as dimethoxymethane and 1,2-dimethoxyethane, and unsaturated hydrocarbons such as hexene, pentadiene, cyclohexene and cyclopentene can be used. By adding such a stabilizer in an amount of, for example, 10 ppm to 10%, preferably 0.1 to 10% by weight, deterioration in performance and the like is not recognized, and more stabilized characteristics can be imparted.

On the other hand, as the solvent, at least one of ketone solvents such as acetone and hydrocarbon solvents such as n-hexane and 2-methylpentane can be added in an amount of 1 to 20 wt%. By adding these solvents, the dissolving power is improved, and the removability of oils and fats in washing is improved.

[0015]

Example 2 A mixture of hexamethyldisiloxane purified in Example 1 and 2-propanol at a weight ratio of 1: 1 was prepared.
0 g was placed in a weight flask, and distillation was performed under normal pressure using a rectification column having 30 theoretical plates. By this distillation, 76.
At 4 ° C., an azeotropic distillate was obtained. When this fraction was analyzed by gas chromatography, it was found that hexamethyldisiloxane contained 54.1 to 54.5 wt%,
Propanol had a composition of 45.5-45.9 wt%. Hexamethyldisiloxane 25-95 wt.
%, And an azeotropic composition having a composition of 5-75 wt% of 2-propanol was prepared.

The stabilizers and / or solvents described in Example 1 can be added to these azeotropic compositions and azeotrope-like compositions. Stable properties and dissolving power can be increased.

[0017]

[Embodiment 3] In this embodiment, the inspection of the products of Embodiments 1 and 2 will be described. First, the fractions of Examples 1 and 2 and compositions having the same composition were placed in a hand wrap container and used as a finishing liquid for hand wiping. The target for hand wiping is PMMA (polymethyl methacrylate),
PC (polycarbonate) with glass filler, PP
(Polypropylene) and ABS (acrylonitrile-
Each plastic plate made of butadiene-styrene) was used, and the surfaces of these plastic plates were finished by hand wiping. As a result, there was no problem such as an attack property to the plastic plate in any case.

Next, 5 × 5 made of each of the above plastics
A test piece having a size of 0 × 2 mm was placed in a glass bottle, filled with 100 g of a mixed solution having the composition shown in Table 1, left at room temperature and normal humidity for 48 hours, and taken out. Examined. As a comparative example, a mixture of ether and ethanol (ether: ethanol = 3: 1) and Freon 113 were used in the same manner. Table 1 shows the results. In the same table, “○” indicates that the weight change was less than 1% and there was no crack generation and dissolution, “△” indicates that the weight change was 1% or more and there was no crack generation and no dissolution, and “×” indicates the weight change. Is 1% or more, and the results of crack generation and dissolution generation are shown.

[0019]

[Table 1]

The azeotropic compositions of Examples 1 and 2 were placed in a hand wrapping container, and an appropriate amount of the azeotropic composition was soaked into clean wipe paper from the hand wrapping container. Hand wiped the lens. As a result, the centering oil could be completely removed, and the optical lens could be cleaned, and good results were obtained without causing burns on the optical lens. In addition, when an equivalent test was conducted using the azeotropic compositions of Examples 1 and 2, good results were obtained.

Further, a glass lens, PMMC and PC
Was cleaned by the following procedure using a plastic lens made of and aluminum as a cleaning material. That is, first, the washed material was degreased while applying ultrasonic waves with an alkali saponifying agent, and then degreased again while adding ultrasonic waves with a surfactant. Thereafter, the surface was removed by washing with water while applying ultrasonic waves to remove the surfactant, followed by washing with pure water while applying ultrasonic waves to remove ions and dirt from the city water to increase the degree of washing. And it washed with IPA (2-propanol) as a drainage of pure water.

Thereafter, the fraction and the azeotropic composition obtained in Examples 1 and 2 were used as a finish drying solution, and the washed product was immersed in the finish drying solution, pulled up and dried. After the above steps, a finish inspection of the washed product was performed. in this case,
The thing which used IPA vapor for finish drying was made into the comparative example. In each of the fractions and the azeotropic compositions of Examples 1 and 2, there was no deterioration of the washed product and no residue on the washed product, and good results were obtained.

[0023]

As described above, the azeotropic composition or azeotropic composition of the present invention has no destruction of the ozone layer,
Since it does not invade materials such as plastics, there is no change in composition due to evaporation, and the drying speed is excellent, it is possible to exhibit excellent effects as a finish drying liquid for hand wiping or washing.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C07F 7/02 C07F 7/08 CA (STN) REGISTRY (STN)

Claims (4)

(57) [Claims] 1. An azeotropic composition or azeotropic composition comprising hexamethyldisiloxane and methanol. 2. An azeotropic composition or azeotropic composition comprising hexamethyldisiloxane and 2-propanol. 3. A dry liquid comprising an azeotropic composition comprising 30 to 95% by weight of hexamethyldisiloxane and 5 to 70% by weight of methanol. 4. A drying liquid characterized by using an azeotropic composition consisting of 25 to 95% by weight of hexamethyldisiloxane and 5 to 75% by weight of 2-propanol.