JPH06232106A - Hydro-extraction cleaning agent and cleaning - Google Patents

Abstract

PURPOSE:To provide a hydro-extraction cleaning agent, which possesses both properties of a cleaning property and a water substitution property, increases the separating (hydro-extracting) speed of water, which adheres to the surface of a ceramic work when the work is cleaned, and is capable of avoiding N possibility of the generation of a 'water stain' and a method of cleaning the ceramic work. CONSTITUTION:A hydro-extraction cleaning agent is a mixed solvent containing a methylene chloride and an isopropyl alcohol and the mixed solvent is constituted of the methylene chloride and the isopropyl alcohol in such a way that the methylene chloride and the isopropyl alcohol are mixed at a ratio (weight ratio) of 95:5 to 65:35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering detergent and a washing method, and more specifically, it has both of detergency and water repellency and is used for washing a processed ceramic article for electronic parts with water. In this case, the present invention relates to a draining detergent and a washing method which can increase the speed of separating (draining) water adhering to the surface of the processed product and avoid the possibility of "water stain".

[0002]

2. Description of the Related Art A ceramic work piece has small dust and chips attached thereto when it is mechanically processed. When wirings, IC chips, and the like are mounted on the processed product while leaving the attached substances such as small dust and chips left, the mounted product may not operate normally, resulting in deterioration of quality. Will be invited.

Therefore, the processed product is subjected to rough cleaning with water, and thereafter, extremely small dust contained in the water is removed, and at the same time,
In order to prevent the generation of "spots" due to the water, the chlorine-based solvent or the alcohol-based solvent is used for water replacement / washing (draining washing), and after the washing, steam or warm air drying is performed to remove the above-mentioned deposits. It is supposed to be removed. By the way, a solvent obtained by adding a surface active agent to a Freon solvent, which is a chlorine-based solvent, is used in the drainage cleaning from the three viewpoints of good water displacement, easy evaporation, and nonflammability. .

By the way, the use of the above-mentioned water-draining detergent containing a CFC solvent as a main component is strictly regulated due to environmental pollution regulations. Therefore, in recent years, as a draining detergent replacing the CFC solvent, a solvent containing isopropyl alcohol, which is an alcohol-based solvent, or a solvent containing methylene chloride, which is a chlorine-based solvent, has been proposed.

[0005]

However, in the case of a solvent containing isopropyl alcohol as a main ingredient, isopropyl alcohol is flammable, so explosion-proof equipment is required, and the equipment becomes large-scale and the equipment cost is high. Get expensive. Its cleaning power is inferior to chlorine-based solvents such as CFCs. However, in the case of a solvent containing methylene chloride as a main component, the water substitution property is poor. Since the water replacement (drainage) speed is slow, "water stains", which are agglomerations of minute dust contained in water, tend to remain on the surface of the workpiece. There are issues such as.

Therefore, the inventor of the present invention cleans minute dust in water adhering to the surface of a workpiece and, as a cleaning agent for water replacement, possesses both detergency and water replacement properties and is explosion-proof. Based on the condition that the solvent does not require auxiliary equipment such as equipment, various solvents were tested, and the results shown in Table 1 were obtained.

[0007]

[Table 1]

From these results, when a mixed solvent of methylene chloride as a chlorine-based solvent and isopropyl alcohol as an alcohol-based solvent is used, its detergency can be improved by its synergistic action. , Good water displacement, depending on the mixing ratio,
It has been clarified that problems such as explosion-proof equipment can be resolved.

The present invention has been made in response to the above-mentioned problems, and the object of the present invention is to have both the cleaning property and the water displacing property and to clean a ceramic workpiece. In doing so, it is an object of the present invention to provide a water-drainage cleaning agent and a cleaning method that can increase the speed of separating (water-draining) water that adheres to the surface of the processed product and avoid the risk of "water stains".

[0010]

Means for Solving the Problems And, as a means for achieving the above object, a draining detergent of the present invention is a mixed solvent containing methylene chloride and isopropyl alcohol, wherein the methylene chloride and isopropyl alcohol are It is composed of a mixture of 95: 5 to 65:35 (weight ratio).

The cleaning method of the present invention is the same as the method for cleaning a ceramic substrate workpiece, wherein the workpiece is treated with methylene chloride and isopropyl alcohol at 95: 5-6.
It comprises a constitution in which after draining and washing with a mixed solvent mixed at a ratio of 5:35 (weight ratio), the processed product is washed with a chlorine-based solvent.

[0012]

The draining detergent of the present invention is a mixture of methylene chloride, which is a chlorine-based solvent having excellent detergency, and isopropyl alcohol, which is an alcohol-based solvent having excellent water-displaceability, and therefore both solvents are used. Act synergistically to efficiently replace the water adhering to the surface of the workpiece and wash the fine dust contained in the water. In addition, the mixing ratio of methylene chloride and isopropyl alcohol is 9
Since it is set to 5: 5 to 65:35, there is no risk of ignition by the isopropyl alcohol, and the water draining speed can be made good while maintaining the detergency of the methylene chloride. Water stains can be prevented.

Further, in the cleaning method of the present invention, the processed product which has been previously washed with water is added with methylene chloride and isopropyl alcohol in a ratio of 95: 5 to 65:35 (weight ratio).
After washing with a mixed solvent mixed with the above, washing and draining (replacement) of the surface of the processed product, contact with a chlorine-based solvent to replace the isopropyl alcohol with the chlorine-based solvent and perform cleaning. Therefore, it is possible to improve the draining speed, improve the cleaning performance, and safely remove the solvent by steam drying or warm air drying.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a cleaning process diagram showing the cleaning method of the present invention, and FIG. 2 is a graph for explaining the relationship between the draining detergent of the present invention and the draining speed.

The drain-cleaning agent of this embodiment is a mixed solvent containing methylene chloride as a chlorine-based solvent and isopropyl alcohol as an alcohol-based solvent.
Here, the mixing ratio of the methylene chloride and isopropyl alcohol is 95: 5-6 by weight ratio (% by weight).
It is set to 5:35.

The drainage cleaning agent of the present embodiment has a drawback of the methylene chloride, which is a chlorine-based solvent, that is inferior in water-displacing power. It has both performances.

By the way, it is known that the isopropyl alcohol is a flammable alcohol solvent and has water-displaceability. Therefore, isopropyl alcohol is added to the methylene chloride to maintain the water-displacing property without deteriorating the cleaning property of the methylene chloride. However, since this isopropyl alcohol is a flammable solvent, isopropyl alcohol is added to methylene chloride as a non-flammable region.
They are mixed at a ratio (weight ratio) of 95: 5 to 65:35. This mixing ratio takes into consideration that the flash point exists when the concentration of isopropyl alcohol exceeds 40% (50 ° C.) and that the drainage speed is good.

Here, isopropyl alcohol was mixed with methylene chloride at a ratio (weight ratio) of 95: 5 to 65:35, because the concentration of isopropyl alcohol in methylene chloride was within the range of 35% to 5%. In this case, after the immersion (contact) in the mixed solvent, the processed product was drained in about 30 to 120 seconds, while the concentration was 3%.
Even if it exceeds 5%, the draining speed does not greatly improve,
On the contrary, if it is necessary to consider explosion-proof equipment, and if the isopropyl alcohol concentration is less than 5%,
This is a solution to the fact that the draining speed becomes slow and "water stains" may remain.

Next, the method for cleaning the workpiece of the present embodiment is a method for cleaning a ceramic substrate using the above-mentioned water-draining cleaning agent, and it will be roughly described. Water-cleaning step, water-draining cleaning (water replacement) step, cleaning The cleaning process is performed through four steps including a process and a solvent removal (drying) process.

-Water Washing Step-In this step, the ceramic substrate is immersed in a hot water tank (water tank), or hot water (water) is sprayed onto the ceramic substrate to spray small dust or dust on the ceramic substrate. This is a process of cleaning and removing deposits such as dust. In addition, as a preliminary step of this step, if necessary, air cleaning may be performed, and after water cleaning, it is left to drain water.

-Draining and Washing (Water Replacement) Step-This step is a step of draining and washing the washing water adhering to the ceramic substrate in the water washing step. That is, in the water washing step, although the adhering matter is removed by the washing water, the washing water itself contains fine dust,
When the minute dust remains on the ceramic substrate,
The aggregation causes "water stains". Therefore, the water drain cleaning is performed with a mixed solvent prepared by mixing the above-mentioned water drain cleaning agent methylene chloride and isopropyl alcohol in a ratio (weight ratio) of 95: 5 to 65:35.

In the drainage cleaning, the ceramic substrate is immersed in a tank containing the mixed solvent and ultrasonic cleaning is performed. Here, the mixed solvent is usually methylene chloride: 90% by weight, isopropyl alcohol: 10
Processing is performed in two or more tanks using a solvent in a weight percentage. Then, in this step, the water particles adhering to the ceramic substrate are detached, replaced with isopropyl alcohol, and washed with methylene chloride and isopropyl alcohol.

-Washing Step-This step is a step of replacing isopropyl alcohol in the mixed solvent of methylene chloride and isopropyl alcohol used in the draining and washing step with methylene chloride (chlorine solvent). In this step, methylene chloride having an excellent cleaning action: 100% (a surfactant is added if necessary) is used as a cleaning agent, and water is replaced (drained) in the previous step.
The ceramic substrate is cleaned, and heat treatment is performed in the next solvent removing step, so that flammable isopropyl alcohol does not remain.

-Solvent Removal (Drying) Step-This step is a step of removing methylene chloride on the surface of the ceramic substrate washed in the previous step, and usually methylene chloride is removed by steam drying. Then, through the above steps, the ceramic substrate can be washed and replaced with water.

Next, in order to confirm the effects of the above-described water removing detergent and cleaning method of the present embodiment, the relationship between the concentration of isopropyl alcohol in methylene chloride and the water removing speed, and the "solvent of methylene chloride and isopropyl alcohol" When tests were performed on "water stain residue" and "cleaning quality", the relationship shown in FIG. 2 and the results shown in Table 2 were obtained.

[0026]

[Table 2]

Then, as shown in FIG. 2, the mixed solvent of methylene chloride and isopropyl alcohol is 95:
A ratio (weight ratio) of 5 to 65:35 is preferable, and the concentration of isopropyl alcohol in methylene chloride is 35%.
Even if it exceeds the above, the draining speed does not improve significantly, it is necessary to consider the explosion-proof equipment on the contrary, and if the isopropyl alcohol concentration is less than 5%, the draining speed will be slow and "water stain" will occur. It was confirmed that there is a risk of remaining. In addition, as shown in Table 2, in the case of using only methylene chloride (adding a surfactant if necessary), which has an excellent cleaning action, the "water stain" remains in half of the test sample. In contrast, when the mixed solvent of this example was used, no "water stain" residue could be confirmed. From this, it can be confirmed that isopropyl alcohol is mixed and draining (water replacement) is sufficiently performed in this example. Regarding the cleaning quality, no difference was observed between the two.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but includes configurations that can be modified and implemented within the scope of the present invention. Incidentally, in the above-mentioned embodiment, the mixed solvent, if necessary, other chlorine-based solvent,
It goes without saying that the composition may be such that an alcohol solvent and a surfactant are appropriately added.

[0029]

As is clear from the above description, according to the dewatering detergent of the present invention, methylene chloride, which is a chlorine-based solvent having excellent detergency, and an alcohol-based solvent, which is excellent in water displacement, are used. Since it is a solvent mixed with a certain isopropyl alcohol, the water adhering to the surface of the processed material can be efficiently replaced, and the fine dust contained in the water can be efficiently washed, and it can be used as a draining detergent instead of CFC. Further, since the mixing ratio of methylene chloride and isopropyl alcohol is 95: 5 to 65:35, there is no risk of ignition by the isopropyl alcohol and expensive explosion-proof equipment is not required. Further, with the washing power of methylene chloride being maintained, the water draining speed can be improved, and the occurrence of "water stains" on the surface of the processed product can be prevented.

Further, according to the cleaning method of the present invention, the processed product previously washed with water is mixed with the methylene chloride and isopropyl alcohol at a ratio of 95: 5 to 65:35 (weight ratio). The surface of the processed product is washed and drained (replaced), and then contacted with a chlorine-based solvent to replace the isopropyl alcohol with the chlorine-based solvent and to perform cleaning. It has the effects of improving the speed, improving the cleaning performance, and removing the solvent safely by steam drying or warm air drying.

[Brief description of drawings]

FIG. 1 is a process drawing showing a cleaning method of the present invention.

FIG. 2 is a graph for explaining the relationship between the draining detergent of the present invention and the draining speed.

Claims (2)

[Claims] 1. A drainer comprising a mixed solvent containing methylene chloride and isopropyl alcohol, the methylene chloride and isopropyl alcohol being mixed at a ratio (weight ratio) of 95: 5 to 65:35. Washing soap. 2. A method for cleaning a ceramic substrate workpiece, wherein the workpiece is drained and washed with a mixed solvent in which methylene chloride and isopropyl alcohol are mixed at a ratio of 95: 5 to 65:35 (weight ratio). A cleaning method comprising cleaning the processed product with a chlorine-based solvent.