JPH07138597A - Detergent composition - Google Patents

Abstract

PURPOSE:To lower the solidification point of octamethyltetrasiloxane to widen the range of cleaning temp. CONSTITUTION:Octamethyltetrasiloxane is mixed with 20-50wt.% satd. hydrocarbon such as isoparaffin obtd. in a distillation range of 150 to 240 deg.C. Isoparaffin is so well compatible with octamethyltetrasiloxane that the mixture of both is lower in solidification point than octamethyltetrasiloxane having a solidification point of 17 deg.C, thus enabling cleaning therewith at low temps.

Description

Detailed Description of the Invention

[0001]

The present invention can be used as an alternative cleaning agent for chlorine-based degreasing cleaning agents such as CFCs and trichloroethane.
The present invention relates to a novel detergent composition having excellent properties for precision cleaning of metal parts such as aluminum and iron, optical parts such as lenses and prisms, and electronic parts.

[0002]

2. Description of the Related Art Conventionally, 1,1,2-trichloro-1,1,2 has been used as a cleaning solvent for metal parts, optical parts and the like.
-Trifluoroethane (CFC 113), 1,1,1
-Trichloroethane is used. This is because CFC 113 has low toxicity to living organisms, has selective solubility that it does not attack plastics, rubber, etc. but dissolves fats and oils, and has excellent properties such as fast drying speed and nonflammability. On the other hand, 1,1,1-trichloroethane also has excellent degreasing power and is nonflammable.

Since the Montreal Protocol of 1987, many cleaning agents have been developed for the purpose of reducing CFCs. For example, in JP-A-1-18094, a mixed solvent of CFC 113 and methyl ethyl ketone is disclosed in JP-A-2-18094.
Japanese Patent No. 289693 proposes an azeotropic composition of Freon 234 and an aliphatic alcohol. In addition to this, a number of detergents substituting for CFCs have been developed. For example, an international application of International Publication No. WO91 / 13697 proposes a detergent composed of a low molecular cyclic polyorganosiloxane and isoparaffin.

[0004]

Since chlorine-based solvents such as trichloroethane and freon 113 are chemically particularly stable, they have a long life in the troposphere and diffuse to reach the stratosphere where they are decomposed by sunlight. Since the chlorine radicals generated cause a chain reaction with ozone to destroy the ozone layer, it is required to reduce the use thereof. From this fact, in the above-mentioned Japanese Patent Laid-Open No. 1-318094, the flon 1 is used.
Although a mixed composition of 13 and methyl ethyl ketone is disclosed, the amount used cannot be reduced to some extent.
Further, the above-mentioned Japanese Patent Laid-Open No. 2-289693 discloses an azeotropic composition of CFC 234 and an aliphatic alcohol, which has a relatively low ozone layer destructive property as compared with CFC 113, but completely destroys the ozone layer. It cannot be lost.

On the other hand, the Ministry of International Trade and Industry recommends cleaning with ethanol and is considering using organic solvents such as ketones and ethers. However, when an aliphatic lower alcohol is used, there is a problem in dryness, and a ketone type or ether type is not practical because it deteriorates plastics and the like. Moreover, some of these apply to the organic rules, which poses a problem in safety to the human body.

On the other hand, International Publication No. WO91 / 13
The low molecular weight cyclic polyorganosiloxane proposed in No. 697 hardly deteriorates plastics and the like, and has a characteristic of being highly safe for the human body. However, since some of these compounds have a high freezing point and become solid at around room temperature, when used as a cleaning agent, they not only solidify and cannot be used for cleaning in winter or in cold regions, but they also deteriorate maintainability and are used in the operating temperature range. Is limited.
For this reason, it has been proposed to add isoparaffin to lower the freezing point, but the ratio of the two is not specified, and if it deviates from the proper mixing ratio, the inherent permeability of siloxane may be impaired.

The present invention has been made in consideration of the above circumstances, and has excellent detergency without destroying the ozone layer,
It is an object of the present invention to provide a detergent composition which can be washed over a wide range.

[0008]

The detergent composition of the present invention which achieves the above object, comprises octamethylcyclotetrasiloxane containing 20 saturated hydrocarbons having a distillation range of 150 to 240 ° C.
˜50% by weight is added. Here, isoparaffin is preferable as the saturated hydrocarbon.

Octamethylcyclotetrasiloxane has a high penetrating power and is excellent as a detergent, but has a freezing point of 17 ° C.
Since it becomes solid at low temperature, it cannot be used as a cleaning agent. In the present invention, the property of freezing point depression is utilized by using an additive so that it can be used even at a low temperature. This additive is compatible with octamethylcyclotetrasiloxane, has similar viscosity, surface tension, and flash point, and has a low attack property on various materials that is a characteristic of octamethylcyclotetrasiloxane. From the viewpoint of long-term stability such as composition, it is preferable that the boiling point range or the vapor pressure is similar.

Petroleum hydrocarbons having a narrow distillation range and a boiling point range similar to that of octamethylcyclotetrasiloxane are suitable as additives satisfying these characteristics. Petroleum hydrocarbons include naphthene-based, isoparaffin-based saturated hydrocarbons, and alkylbenzene-based unsaturated hydrocarbons, but unsaturated hydrocarbons include those that fall under the organic rules and those that are carcinogenic. is there. On the other hand, saturated hydrocarbons are highly safe for living organisms and are desirable as an additive used in the present invention. In particular, the isoparaffin type is preferable in terms of high safety.

The isoparaffin added preferably has a distillation range of 150 ° C to 240 ° C and has 9 carbon atoms.
~ 14 isoparaffins correspond. In this range, the boiling point of octamethylcyclotetrasiloxane is 175 ° C., so that long-term stability can be secured. Further, when the distillation range of isoparaffin is 150 ° C. or lower, the flash point becomes low, and when it is 240 ° C. or higher, the drying property is remarkably deteriorated. Therefore, the distillation range is preferably 150 to 240 ° C.

When isoparaffin is added to octamethylcyclotetrasiloxane, its content is 30% by weight.
At this time, the freezing point can be 0 ° C. Further, in this isoparaffin system, the freezing point can be lowered to −10 ° C. with a content of 30% by weight in the fraction of 150 ° C. to 180 ° C.

When the content of isoparaffin becomes excessive, the low viscosity and low surface tension, which are peculiar properties of siloxane, are lost, and the physical property tends to the isoparaffin side.
It is preferably 0% by weight or less.

When washing with the cleaning composition of the present invention, after washing with the composition, linear polydimethylsiloxane or isoparaffin can be used alone as a rinse liquid in addition to the present composition, or Solvents, alcohols, ketones and ethers compatible with the composition of the present invention can be used.

The octamethylcyclotetrasiloxane and isoparaffin, which are constituents of the present invention, are both highly safe against living organisms and do not destroy the ozone layer because they do not contain halogen such as chlorine.

[0016]

Example 1 Octamethylcyclotetrasiloxane having a purity level of 98% has a freezing point of 17 ° C., and the freezing point must be 17 ° C. or higher to be usable as a cleaning agent. Therefore, as an additive to this octamethylcyclotetrasiloxane, hydrocarbons of trade names ACTREL 1140L, ACTREL 1178L, ACTREL 3338L, ACTREL 3356L (above, Exxon Chemical (manufactured)), Naphthesol M (Nippon Petrochemical (manufactured)) 5% by weight, 10% by weight, 15% by weight, 20% by weight of a system solvent,
A cleaning composition was prepared by adding 30% by weight and 50% by weight. Table 1 shows the main components and distillation ranges of these additives.

[0017]

[Table 1]

The mixture prepared as described above was treated at 0 ° C.,
The state was observed by leaving it in a constant temperature bath at -10 ° C. The results are shown in Table 2.

[0019]

[Table 2]

In Table 2, "○" indicates a liquid that can be used as a cleaning liquid in a constant temperature bath, and "x" indicates a liquid that is frozen and becomes a solid and cannot be used as a cleaning liquid. As shown in the table, Actorrel 1140L, Actorrel 3
338L of 30% by weight mixed solution and 50% by weight of the total solution
With the mixed solution, the freezing point could be lowered to -10 ° C. As a result, even if the temperature is 17 ° C. or less in winter, etc., it can be used easily without freezing in the can or the washing tank.

Next, Octrell 3338L was added to octamethylcyclototerasiloxane 20, 30, 40, and 5
A cleaning agent composition was prepared by adding 0% by weight, and an aluminum plate having a trade name “Daphne Cut HS-5” (Idemitsu (manufactured)) applied as a cutting oil was washed as an object to be washed. Figure 1
Indicates this cleaning system, which is the first tank A, the second tank B, and the third tank
An ultrasonic transducer 1 in which tank C and fourth tank D are used as cleaning tanks, and the first to third tanks A to C are driven at 28 to 29 KHz and 300 W.
0 is attached, and each of the tanks A to D is filled with the above-mentioned cleaning composition at room temperature. E is a drying tank. The objects to be cleaned are immersed in the first to third tanks A to C, and shaken at room temperature for 2 minutes while being subjected to ultrasonic vibration for cleaning. In the fourth tank D, only immersion is performed, and then in the drying tank E. At 80 ° C with warm air.

After washing, the finish was evaluated by visual observation, surface observation with a scanning electron microscope, and elemental qualitative analysis by EPMA. As a result, no residue was observed by surface observation, and no element other than aluminum was detected in elemental analysis.

[0023]

[Example 2] 20,30,40,50% by weight of naphthezol M described above in octamethylcyclotetrasiloxane
The added cleaning composition was prepared and washed as follows. The product name "Daphne Cut HS-5" (Idemitsu (manufactured)) was applied as a cutting oil to an aluminum disc-shaped disc, and FIG.
It was immersed in the first tank A shown in (1) and shaken at room temperature for 2 minutes while applying ultrasonic waves at 29 KHz and 300 W. Similarly, in the second tank B and the third tank C, ultrasonic waves and shaking are applied,
In the fourth tank D, octamethyltrisiloxane was used as a rinse liquid, and only immersion pulling for 2 minutes was performed. After this pulling up, hot air blow at 80 ° C. was added in the drying tank E for drying.

The state after washing was evaluated by visual observation, observation with a scanning electron microscope, and elemental qualitative analysis by EPMA. As a result, no residue was observed by visual observation or microscopic observation. In addition, elements other than aluminum were not detected in elemental analysis.

[0025]

Example 3 A cleaning composition was prepared by adding 20,30,40,50% by weight of 1140 L described above to octamethylcyclotetrasiloxane, and the following cleaning was performed.

A product name "Yushiron CG" (Yushiro Kagaku Co., Ltd.) is applied to a glass lens as a centering oil, immersed in the first tank A shown in FIG. 1, and subjected to ultrasonic vibration at 29 KHz and 300 W at room temperature. Then, rocked for 2 minutes. Similarly, in the second tank B and the third tank C, ultrasonic waves and shaking were applied, and in the fourth tank D, octamethyltrisiloxane was used as the rinse liquid, and only the dipping for 2 minutes was performed. After raising
In the drying tank E, a hot air blow of 80 ° C. was added and dried.

The state after washing was washed by visual observation, observation with a scanning electron microscope, and elemental qualitative analysis by EPMA. As a result, no residue was visually or microscopically observed. In addition, in the elemental analysis, anything derived from the centering oil or the cleaning liquid other than the glass material was not detected.

[0028]

[Example 4] Octamethylcyclotetrasiloxane was added to the above Actrell 1140L for 20, 30, 40, 50
A cleaning agent composition added by weight% was prepared and washed.
That is, a glass lens coated with trade name "Yushiron CG" (Yushiro Kagaku Co., Ltd.) as a centering oil, immersed in the first tank A shown in FIG.
It was shaken for 2 minutes while applying ultrasonic vibration of W. Similarly, ultrasonic waves and shaking are applied to the second tank B and the third tank C,
In the fourth tank D, octamethyltrisiloxane was used as a rinse liquid, and only immersion pulling for 2 minutes was performed. After pulling up, hot air blow at 80 ° C. was added in the drying tank E for drying.

The condition after washing was evaluated by visual observation, observation with a scanning electron microscope and elemental qualitative analysis by EPMA. As a result, no residue was observed by visual observation or microscopic observation. In addition, in the elemental analysis, anything derived from the centering oil or the cleaning liquid other than the glass material was not detected.

[0030]

As described above, according to the present invention, since the saturated hydrocarbon having a distillation range of 150 to 240 ° C. is added to octamethylcyclotetrasiloxane, the operating temperature range of octamethylcyclotetrasiloxane is expanded, which is convenient for use. In addition, it can be safely used for the human body without destroying the ozone layer.

[Brief description of drawings]

FIG. 1 is a side view of an example of a cleaning system to which the present invention is applied.

[Explanation of symbols]

 A 1st tank B 2nd tank C 3rd tank D 4th tank E Drying tank

[Table 3]

Claims (2)

[Claims] 1. Octamethylcyclotetrasiloxane containing 20 to 50 saturated hydrocarbons in a distillation range of 150 to 240 ° C.
A detergent composition, wherein the detergent composition is added by weight%. 2. The cleaning composition according to claim 1, wherein the saturated hydrocarbon is isoparaffin.