JPH0824806A - Cleaning method - Google Patents

Abstract

PURPOSE:To remove organic oil dirt efficiently by adding a mixture of a specified polyorganosiloxane compound and a specified fluoro-compound to an aqueous cleaning agent or water as a rinsing liquid and using the resulting mixture in a cleaning process to clean an article. CONSTITUTION:The article cleaning method effective for removal of organic oil dirt such as fluxes, processing oils, etc., involves a cleaning process in which a mixed liquid of at least one of polyorganosiloxane compounds expressed by formula I and at least one of fluoro-compounds expressed by formula II or III is added to at least one of an aqueous cleaning agent and a rinsing liquid in 0.01-0.1wt.% ratio to carry out cleaning. At that time, the specific gravity of the mixed liquid is adjusted to be 0.9-1.1. After the cleaning and rinsing, drying a carried out at 80 deg.C or lower. In the formula, n stands for 0.5 integer, R1 may be the same or different substituted or unsubstituted univalent organic group, l is 4-6 natural number, and p and q is 1-4 natural number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method comprising a step of cleaning an article with an aqueous cleaning agent, a step of rinsing the aqueous cleaning agent, and a step of drying a rinse liquid.

[0002]

2. Description of the Related Art Conventionally, flux, processing oil, wax,
To remove organic oil stains such as grease, trichloroethylene, 1,1,1-trichloroethane, halogenated hydrocarbon solvents such as Freon 113, benzene, xylene,
Hydrocarbon solvent such as kerosene, or alcohol,
Alcoholic solvents such as glycol ethers have been used. However, such solvent-type cleaning agents are regulated for use due to problems of environmental destruction such as ozone layer depletion and safety of human body such as carcinogenicity.

Therefore, recently, an aqueous alkaline detergent composed of a silicate, a sodium salt, or an amine compound and a surfactant, or a semi-aqueous system containing an alcohol, a glycol ether, and a terpene as a main component and further a surfactant is used. Aqueous cleaning agents have been proposed.

The above-mentioned water-based cleaning agent or semi-water-based cleaning agent contains a surfactant for the purpose of controlling the rate of defective cleaning, controlling the amount of cleaning solution carried out, preventing sensor malfunction, and preventing liquid scattering. An antifoaming agent or a defoaming agent is added to suppress foaming caused by Examples of such antifoaming agents include silicone-based, alcohol-based, polyoxyalkylene-based, amide-based, fatty acid-based, aliphatic ester-based,
Mineral oil type, oil and fat type, phosphoric acid ester type and the like can be mentioned.
Particularly in recent years, silicone-based defoamers have been widely used because of their solubility, dispersion and diffusivity, low surface tension and interfacial tension, low specific gravity, and the like.

[0005]

However, conventionally used water-soluble antifoaming agents such as alcohol-based and polyoxyalkylene-based agents have a low effect of suppressing foaming, and when added to a rinsing solution, foaming occurs on the contrary. There is a problem that it becomes easier. On the other hand, non-water-soluble antifoaming agents such as mineral oil-based and oil-based oil-based defoaming agents have a short duration of foam-suppressing effect when added to a cleaning solution, and when added to a rinsing solution, cause deterioration of cleaning quality such as cleaning stains. I have a problem. Further, although silicone-based defoaming agents that have been widely used in recent years have the effect of suppressing foaming with a small addition amount, they have a relatively high viscosity of 100 cp or more and are poor in volatility. If added to the rinsing solution, there is a problem that the water rinsing property is deteriorated or the water is adsorbed on the surface of the object to be cleaned, and if it is added to the rinsing solution, there is a problem that the cleaning quality is deteriorated such as cleaning stains and poor drying.

The present invention has been made in view of the above-mentioned conventional problems, and not only does the problem due to foaming not occur, but also causes deterioration of cleaning quality, deterioration of water rinsability, and cleaning of the surface of an object to be cleaned. No problems such as adsorption will occur,
An object of the present invention is to provide a method for cleaning an article that removes organic oil stains.

[0007]

In order to solve the above problems, the invention according to claim 1 provides at least one polyorganosiloxane compound represented by Chemical Formula 1 or Chemical Formula 2 in a washing step for washing an article. And chemical formula 3, chemical formula 4 or chemical formula 5
0.01 to 1.0 wt% of a mixed liquid composed of at least one kind of a fluorine compound represented by the above, in at least one of water-based detergent or water as a rinse liquid for rinsing the water-based detergent. % Was added for cleaning.

[0008]

[Chemical 1]

[0009]

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[0010]

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[0011]

[Chemical 4]

[0012]

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The invention according to claim 2 is characterized in that, in the invention according to claim 1, it is washed with an aqueous detergent, rinsed with a rinsing liquid, and then dried at a temperature of 80 ° C. or less.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention according to, the specific gravity of the mixed liquid is in the range of 0.9 to 1.1.

The polyorganosiloxane compound represented by Chemical Formula 1 or Chemical Formula 2 used in the present invention is not only excellent in chemical and thermal stability, but also hardly compatible with water, a polar solvent, and a surfactant, so that the human body and It is also highly safe for the global environment. Further, since it has a low viscosity and a small surface tension, it has excellent dispersibility at the interface between the cleaning liquid or the rinse liquid and air, and a small amount of it exhibits a high defoaming effect. Further, since it has excellent volatility, even if it remains on the surface of the object to be cleaned after the rinsing step, it can be easily volatilized and removed in the next drying step.

Further, the fluorine compound represented by Chemical formula 3, Chemical formula 4 or Chemical formula 5 used in the present invention is not only excellent in chemical and thermal stability, but also hardly compatible with most organic solvents and water, It is also highly safe for the human body and the global environment. Furthermore, since it has a low viscosity and a small surface tension, it has better dispersibility than the polyorganosiloxane compound.
Further, since it has excellent volatility, even if it remains on the surface of the object to be cleaned after the end of the tinning step, it can be easily volatilized and removed in the next drying step.

However, this fluorochemical has a specific gravity of 1.5.
For the above reasons, when used alone, it is difficult to disperse it in the water-based detergent or the rinse liquid, and therefore it is not possible to achieve a sufficient defoaming effect. Therefore, in the present invention, the fluorine compound and the polyorganosiloxane compound are mixed to prepare a mixed solution having a specific gravity in the range of 0.9 to 1.1, whereby an aqueous cleaning agent or a rinse solution is obtained. It is advisable to improve the dispersibility at the interface with air and to devise a high defoaming effect. When the specific gravity of the mixed solution is less than 0.9, the mixed solution may be completely floated on the upper surface of the water-based cleaning agent or the rinse solution, which may cause ignition, and the volatilization speed may be accelerated, and the duration of the defoaming effect may be shortened. There's a problem. On the other hand, when the specific gravity of the mixed liquid is larger than 1.1, there is a problem that the aqueous cleaning agent and the rinse liquid are retained in the lower part of the mixture and the defoaming effect cannot be sufficiently exhibited. When the specific gravity of the mixed solution is adjusted to be in the range of 0.9 to 1.1, the mixed solution is easily dispersed at the interface between the water-based cleaning agent and the rinsing solution and air, and the defoaming effect can be sufficiently exhibited. Also,
Depending on the types of the polyorganosiloxane compound and the fluorine compound to be added, they may be separated at a low temperature. Therefore, it is desirable to raise the temperature until they are uniformly mixed and then add them to the water-based detergent or rinsing liquid. Furthermore, it is desirable to use the water-based cleaning agent and the rinsing solution at a temperature at which they are uniformly mixed.

[0018]

EXAMPLES Examples 1 to 12 are examples in which the mixed liquid of the present invention was added to an aqueous detergent. In Example 1, the linear polyorganosiloxane compound having Si number = 2 (hexamethyldisiloxane) and the linear perfluorocarbon (tetradecafluorohexane) were mixed at a ratio of 78:22 (weight ratio) of 38.
The mixed solution mixed at a liquid temperature of ℃, the water-based cleaning agent EE-111
0 (manufactured by Olympus Optical Co., Ltd.) was added to the 100-fold diluted solution at 0.1 wt%. A cutting oil (Unicut GH35, manufactured by Nippon Oil Co., Ltd.) was applied using this water-based cleaning agent, and the slide glass dried at 100 ° C. for 10 minutes was ultrasonically cleaned for 3 minutes (40 kHz, 100 W). afterwards,
Ultrasonic waves (40 kHz, 100 W) for 5 minutes with pure water at 30 ° C
I did a rinse. And finally, it was dried for 2 minutes with warm air of 80 ° C.

After drying, the washability was visually evaluated.
Table 1 shows the results. The evaluation criteria are as follows. (Evaluation Criteria for Detergency) ○: No deterioration in cleaning quality such as poor cleaning or poor drying occurs on the surface Δ: Slight deterioration in cleaning quality such as poor cleaning or poor drying occurs on the surface ×: On the surface Poor cleaning quality, such as poor cleaning or poor drying

[0020]

[Table 1]

In order to evaluate the defoaming property, 200 ml of the cleaning agent was blown with 3 liters of air per minute for 10 seconds by an air stone to foam.
The foam height at this time was measured at the initial stage and after 3 minutes to evaluate the defoaming property. The results are also shown in Table 1 above. The smaller the number, the better the defoaming property. As you can see from Table 1,
According to Example 1, good results were obtained in terms of detergency and defoaming property.

In Examples 2 to 12, the cleaning property and the deodorizing property were changed even in the case where the mixing ratio of the polyorganosiloxane compound and the fluorine compound and the addition amount of this mixed liquid to the water-based cleaning agent EE-1110 were changed. The foamability was evaluated, and the results are shown in Table 1. Further, as a comparative example, a water-based cleaning agent EE-1110 alone containing neither a polyorcanosiloxane compound nor a fluorine compound was used as Comparative Example 1.
In Comparative Examples 2 and 3, both the polyorganosiloxane compound and the fluorine compound were added to the water-based detergent EE-1110, and both were added to the water-based detergent EE-1110, but the addition amount was small. Is shown in Comparative Example 4.

As a result, it can be seen that when a mixed solution of polyorganocinoxane and a fluorine compound is added, there is no problem in detergency and defoaming property, but when a relatively high viscosity polyorganosiloxane compound is used. Shows that there is a problem in detergency, and there is a problem in defoaming property when the mixed solution is not added, when only the fluorine compound is added, and when the added amount of the mixed solution is small.

Examples 13 to 24 are examples in which the mixed solution of the present invention was added to the rinse solution. In Example 13, Si number = 2
The linear polyorganosiloxane compound (hexamethyldisiloxane) and the linear perfluorocarbon (tetradecafluorohexane) were mixed at a ratio of 78:22 (weight ratio) at a liquid temperature of 38 ° C. to obtain pure water. 0.1 wt%
Added to form a rinse. After immersing a clean slide glass in this rinse solution, the slide residue was pulled up at a speed of 2 mm / sec and dried in an oven at 80 ° C. for 2 minutes, and the dry residue was visually evaluated. The results are shown in Table 2. The evaluation criteria are as follows. (Evaluation Criteria for Dryability) ◯: No stain such as dry residue is generated on the surface ×: Stain such as dry residue is generated on the surface The pulling speed at this time is 2 mm / sec. However, if the speed is slower than this, there is no problem. Further, the drying temperature is not limited to 80 ° C., and there is no problem if it is about 60 to 80 ° C.

[0025]

[Table 2]

Further, in order to evaluate the defoaming property, 3 liters of air per minute was blown by an air stone for 10 seconds to 200 ml of a model rinse solution in which 0.1 wt% of EE-1110 was added to the rinse solution. Foamed. The foam height at this time was measured at the initial stage and after 3 minutes to evaluate the defoaming property. The results are also shown in Table 2 above. The smaller the number, the better the defoaming property. As can be seen from Table 2, according to Example 13, good results were obtained in terms of cleaning property and defoaming property.

In Examples 14 to 24, the mixing ratio of the polyorganosiloxane compound and the fluorine compound,
With respect to examples in which the amount of this mixed solution added to the rinsing solution (pure water) was changed, the drying properties and defoaming properties were evaluated, and the results are shown in Table 2. In addition, as a comparative example, a pure water containing no polyorganosiloxane compound and no fluorine compound was compared with Comparative Example 5, and one containing either the polyorganosiloxane compound or the fluorine compound was added to pure water. In Examples 6 and 7, Comparative Example 8 shows that both were added to pure water but the addition amount was small.

As a result, when the mixed solution of the polyorganosiloxane and the fluorine compound was added to pure water, it was found that there was no problem in defoaming property and drying property. However, the polyorganosiloxane compound having a relatively high viscosity was used. It was found that there was a problem in dryness, and there was a problem in defoaming property when the mixed solution was not added, when only the fluorine compound was added, and when the added amount of the mixed solution was small.

Although the mixed solution of the polyorganosiloxane and the fluorine compound is added to one of the water-based cleaning agent and the rinsing solution (pure water) in the above embodiment, the present invention is not limited to this embodiment. Alternatively, it may be added to both the water-based detergent and the rinse liquid.

[0030]

As described above, according to the cleaning method of the present invention, not only the problems due to foaming do not occur, but also the cleaning quality is deteriorated, the water rinsing property is deteriorated, and adsorption to the surface to be cleaned is achieved. It does not cause problems such as the occurrence of stains, and the organic oil stain can be satisfactorily removed.

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Claims (3)

[Claims] 1. A washing process for washing an article, comprising:
Alternatively, a mixed liquid composed of at least one of the polyorganosiloxane compounds represented by Chemical formula 2 and at least one of the fluorine compounds represented by Chemical formula 3, Chemical formula 4 or Chemical formula 5 is used as an aqueous cleaning agent or an aqueous cleaning agent. 0.01 to at least one of water as a rinsing liquid for rinsing the agent
A cleaning method characterized by adding up to 1.0% by weight and cleaning. Embedded image Embedded image Embedded image [Chemical 4] Embedded image 2. The cleaning method according to claim 1, further comprising cleaning with the water-based cleaning agent, rinsing with the rinse solution, and then drying at a temperature of 80 ° C. or lower. 3. The cleaning method according to claim 1, wherein the specific gravity of the mixed liquid is in the range of 0.9 to 1.1.