JP2532804B2 - How to bleed the cleaning liquid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to mechanical parts, electronic parts,
The present invention relates to an air bleeding method of a cleaning liquid for performing ultrasonic cleaning, immersion cleaning, and the like of an object to be cleaned such as a printed circuit board.

Conventionally, it has been known that a cleaning liquid for immersing and cleaning an object to be cleaned, which does not dissolve air, produces an excellent cleaning effect. For example, when performing ultrasonic cleaning, it is known that if air is present in the cleaning liquid, the transmission of ultrasonic waves to the object to be cleaned is attenuated by the air, and a strong ultrasonic cleaning effect can not be obtained. . Further, when the object to be cleaned is an iron-based component, if a large amount of air is mixed in the cleaning liquid such as water, a water-based cleaning liquid containing a surfactant, a semi-aqueous cleaning liquid, etc., rusting easily occurs.

Therefore, conventionally, to remove air from the cleaning liquid, ultrasonic vibration is applied to the cleaning liquid, and the cleaning liquid is located in a closed tank, and the closed tank is sucked by a vacuum pump to remove air. The method is known.

[0004]

However, although the method of applying ultrasonic vibration to the cleaning solution has a certain degree of air venting effect, it is extremely inadequate and has the drawback of requiring a long time for the operation. It was a thing.

Further, the method in which the cleaning liquid is located in the closed tank and the inside of the closed tank is sucked by a vacuum pump to remove air is complicated and expensive because it requires a pressure-resistant cleaning device. It was something that had.

Further, the mixing of air occurs remarkably because the higher the viscosity of the cleaning liquid is, the stronger the force for holding the air is, and the ultrasonic cleaning effect is easily attenuated and rust is generated. In that respect, fluorine-based solvents, chlorine-based solvents and the like were excellent as cleaning liquids because of their low viscosity, but their use was restricted because they were associated with environmental damage. Therefore, the cleaning liquid, terpene solvent, silicon-based solvent, hydrocarbon-based solvent,
Although it is contemplated to use a hydrophilic solvent agent of higher alcohol, both of which are high viscosity solvent. Therefore, the ultrasonic cavitation generated from the ultrasonic vibrator is attenuated by the highly viscous cleaning liquid before reaching the object to be cleaned, and the ultrasonic cleaning effect cannot be generated or significantly reduced.

Further, water, an aqueous cleaning solution containing a surfactant,
The use of a semi-aqueous cleaning liquid or the like as a cleaning liquid is widely performed depending on the object to be cleaned. Since these have relatively low viscosities, they are less likely to impair the ultrasonic cleaning effect, but when air is mixed, rust is easily generated in the case of iron-based parts.

The present invention is intended to solve the above-mentioned problems, and the cleaning liquid is evacuated for immersing and cleaning an object to be cleaned without using a vacuum pump or the like, and is inexpensive at a simple method. Is what you are trying to get.

Therefore, even if a highly viscous cleaning liquid such as a water-insoluble terpene solvent, a silicon-based solvent, a hydrocarbon-based solvent, or a higher alcohol such as a hydrophilic solvent is used for cleaning an object to be cleaned, This makes it possible to obtain a sonic cleaning effect.

Further, it is intended to prevent generation of rust during cleaning by extracting air from a cleaning liquid such as water, an aqueous cleaning liquid containing a surfactant, a semi-aqueous cleaning liquid, or the like.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention heats a cleaning liquid to a temperature below a boiling point,
In this heated cleaning liquid, a supply solvent having a lower boiling point than that of the cleaning liquid is liquefied or vaporized and supplied, and this supply solvent is vaporized by the cleaning liquid and discharged from the liquid surface of the cleaning liquid. Is.

According to another aspect of the invention, the cleaning liquid is heated to a temperature not higher than the boiling point, a supply solvent having a lower boiling point than that of the cleaning liquid is liquefied or vaporized and supplied into the cleaning liquid in the heated state, and ultrasonic waves are applied to the cleaning liquid. It is characterized in that the supply solvent is vaporized in the cleaning liquid by applying vibration and is discharged from the liquid surface of the cleaning liquid.

The cleaning liquid is a hydrocarbon solvent, a terpene solvent, a silicon solvent, a hydrophilic solvent, water, an aqueous cleaning liquid containing a surfactant, a semi-aqueous cleaning liquid, a chlorine solvent, a fluorine solvent, the second generation. Freon (HCFC) or a completely fluorinated liquid may be used.

The solvent to be supplied is a hydrocarbon solvent, a terpene solvent, a silicon solvent, a hydrophilic solvent, a chlorine solvent, a fluorine solvent, a second-generation CFC (HCFC), which has a lower boiling point than the cleaning liquid, and a complete solvent. It may be a fluorinated liquid or HFC.

[0015]

EXAMPLE An example of the present invention will be described below, and changes in ultrasonic cavitation due to a degassing promoting effect in a cleaning agent were compared in an attack state on an aluminum foil.

Sample aluminum foil 43mm × 45mm
Thickness 15μ Aluminum foil Average weight 0.0770g Detergent used Butyl carbitol (higher alcohol) Cleaning bath 370 × 245 × 150H (liquid depth) Liquid volume ≈ 13.6
L Ultrasonic frequency 40 to 90KHZ (multi-ultrasonic) and output 500W Liquid temperature at the time of comparison 29 ℃ Ultrasonic time 1 minute each comparison

Experimental example 1 (comparative example). Experiment after 30 minutes of ordinary degassing (normal degassing was performed by applying ultrasonic vibration to the solution before the experiment) Weight after ultrasonic treatment in liquid Sample 1 0.0773 g Sample 2 0.0779 g Sample 3 0.0752 g Average 0 0.0768 g 0.0770 g-0.0768 g = 0.0002 g 0.0002 g / 0.0770 g × 100 = 0.259
7 Average weight loss rate 0.26%

Experimental Example 2. (Example) Detergent butyl carbitol was heated to 57 ° C. or higher, and 5 liters having a boiling point of 55 ° C., the main component of which was a perfluorinated liquid, was added to the heated liquid, and ultrasonic waves were applied for 30 minutes. It was During this period, the completely fluorinated liquid boiled to become vapor and rose, and contacted the cooling coil in the upper part of the cleaning tank to be condensed and liquefied. The liquefied fully fluorinated liquid dropped into the detergent and repeatedly rose as vapor. Then, the whole liquid was naturally cooled to 29 ° C. and a sample test was performed.

Weight after ultrasonic treatment in liquid Sample 4 0.0716 g Sample 5 0.0735 g Sample 6 0.0754 g Average 0.07 35 g 0.0770 g-0.07 35 g = 0.00 35 g 0.00 35 ÷ 0.0770 × 100 = 4 . 5 Average weight loss rate 4 . 5%

[0020] As described above, by performing the air vent in the process of the present invention, ultrasonic cleaning effect is seen attack effects or <br/> et to the aluminum foil, so as to improve 17 times strength than the conventional method There is. This effect, with a washing liquid in to be the air vent, by which boiling Aga蒸 vaporized low liquid of different boiling points, the boiling vaporization
It is believed that taking disconnect the air in the cleaning liquid with for. Therefore, the same effect can be expected even if a chlorine-based solvent or a fluorine-based solvent (including HCFC) other than the completely fluorinated liquid is used.

[0021]

INDUSTRIAL APPLICABILITY The present invention makes it possible to obtain an excellent air bleeding effect at a low cost by a simple method, without using a vacuum pump or the like for air bleeding of a cleaning liquid for immersing and cleaning an object to be cleaned as described above. .

By performing ultrasonic cleaning with the air-cleaned cleaning liquid, the transmission of ultrasonic vibration is not attenuated by air, and a good ultrasonic cleaning effect can be obtained.

Further, water, an aqueous cleaning solution containing a surfactant,
Even when the iron-based object to be cleaned is washed with a semi-aqueous cleaning liquid or the like, air in the cleaning liquid does not cause rust.

Claims (5)

(57) [Claims] 1. A cleaning liquid is heated to a temperature not higher than the boiling point, and a supply solvent having a lower boiling point than that of the cleaning liquid is supplied in a liquid state or vaporized into the heated cleaning liquid, and the supply solvent is vaporized in the cleaning liquid. An air venting method for cleaning liquid, which is performed by discharging the cleaning liquid from the liquid surface. 2. The cleaning liquid is heated to a temperature below the boiling point, and a supply solvent having a lower boiling point than that of the cleaning liquid is liquefied or vaporized in the heated cleaning liquid, and ultrasonic vibration is applied to the cleaning liquid. A method for venting a cleaning liquid, characterized in that the supply solvent is vaporized in the cleaning liquid and is discharged from the surface of the cleaning liquid. 3. The cleaning liquid is a hydrocarbon solvent, a terpene solvent, a silicon solvent, a hydrophilic solvent, water, an aqueous cleaning liquid containing a surfactant, a semi-aqueous cleaning liquid, a chlorine solvent, a fluorine solvent, a second generation. CFC (HCFC), according to claim 1 or 2 vent method of the cleaning liquid, wherein it is fully fluorinated liquid. 4. The supply solvent has a lower boiling point than the cleaning liquid,
Hydrocarbon solvents, terpene solvents, silicone-based solvent, a hydrophilic solvent, chlorinated solvents, fluorine-based solvent, a second-generation fluorocarbons (HCFC), fully fluorinated liquid, or claim 1, characterized in that a HFC 2. A method for venting the cleaning liquid according to 2. 5. A feed solvent was vaporized in the wash solution, the cleaning solution was air vent to release from the liquid surface of the cleaning solution, or claim 1, characterized in that for use as an ultrasonic cleaning liquid to be cleaned 2. A method for venting the cleaning liquid according to 2.