JP7141768B1 - Cleaning equipment for objects to be cleaned - Google Patents

Abstract

Kind Code: A1 To enable cleaning that does not adversely affect the human body while giving consideration to the global environment without incurring a great deal of cost. SOLUTION: A mixed solvent 16 in which HFC-365mfc and HFO-1233zd(z) having a small boiling point difference are mixed at a mixing ratio according to the purpose of cleaning is contained in the cleaning tank 1, and Liquid cleaning of the object to be cleaned 15 with the mixed solvent 16 and/or steam cleaning with the cleaning steam 17 generated by heating the mixed solvent, and the mixed solvent 16 used for this liquid cleaning and/or steam cleaning By distilling and regenerating the mixed solvent 16, the mixed solvent 16 can be reused. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a cleaning apparatus for cleaning objects to be cleaned, such as mechanical parts, electronic parts, and medical equipment, with a mixed solvent.

CITATION LIST Patent Literature Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2000-36478 SUMMARY OF THE INVENTION In 1995, the fluorine-based solvent Freon 113 and the chlorine-based solvent 1.1.1. Since then, highly toxic trichlorethylene, perchlorethylene, methylene chloride, and the like are still used as cleaning solvents that can be easily used in the cleaning industry. These cleaning solvents are said to be carcinogenic substances and may adversely affect the human body. As shown in Patent Document 1, cleaning solvents such as HFC and HFE are generally used alone or mixed with other solvents.

In the cleaning industry, petroleum-based solvents are often used as cleaning solvents, but since the boiling point of these petroleum-based solvents is as high as 170°C to 220°C, steam cleaning is difficult unless the pressure is reduced. . Furthermore, petroleum solvents are flammable and pose a fire hazard. Therefore, when a petroleum-based solvent is used as a cleaning solvent, it is difficult to deal with it with existing cleaning equipment, and new dedicated equipment investment is required. Therefore, for many small and medium-sized enterprises dealing with such cleaning equipment, it is necessary to invest a large amount of money in facility investment, and it has been difficult to deal with it in consideration of the cost aspect.

Therefore, the present invention is intended to solve the above-mentioned problems, and is intended to enable cleaning that does not adversely affect the human body while giving consideration to the global environment without incurring a great deal of cost.

HFC -365mfc and HFO-1233zd(z) are widely known as cleaning solvents. However, although HFC-365mfc has the advantage of being inexpensive, its use is limited due to its high global warming potential and weak degreasing power. On the other hand, although HFO-1233zd(z) has the advantages of low global warming potential and high degreasing power, it is not mass-produced at present and is expensive, so when used alone, the cost is high. . Therefore, it has been difficult to use HFC-365mfc alone or HFO-1233zd(z) alone as a cleaning solvent because of the disadvantages described above. Therefore, the inventors of the present application paid attention to the fact that the boiling point difference between HFC-365mfc and HFO-1233zd(z) was small, and came to develop a mixed solvent in which both are mixed.

That is, HFC-365mfc has a boiling point of 40.2°C and HFO-1233zd(z) has a boiling point of 39°C. In general, a mixed solvent in which two different liquids are mixed has been conventionally used, but when two different liquids are mixed and heated to generate steam, one of them is will evaporate first. Therefore, there is a problem that the mixing ratio of the mixed solvent after the two liquids are mixed and heated changes. Also, when trying to reuse a two-liquid mixed solvent with a larger boiling point difference, there is a significant difference in the evaporation time of each liquid. was difficult.

On the other hand, if the difference in boiling points between the liquids that make up the mixed solvent is extremely small, heating the mixed solvent to near the boiling point will generate steam almost simultaneously, so it is unlikely that only one of them will evaporate. , the mixing ratio of each liquid in the remaining mixed solvent does not change significantly. Further, when the mixed solvent is distilled after liquid cleaning or vapor cleaning with the mixed solvent, distillation regeneration can be carried out almost simultaneously. Therefore, even though it is a mixed solvent, the mixed solvent can be recovered and reused by the same procedure as when used alone, and the mixed solvent can be easily managed.

By changing the mixing ratio of HFC-365mfc and HFO-1233zd(z), it is possible to obtain a mixed solvent suitable for the purpose of use. For example, the mixing ratio of HFC-365mfc and HFO-1233zd(z) can be changed to adjust the strength of the degreasing power, or the mixing ratio of HFO-1233zd(z) can be increased to reduce the burden on the environment. On the other hand, by increasing the mixing ratio of HFC-365mfc, the price can be lowered.

Further, the above-mentioned mixed solvent may be one in which HFO-1233zd(z) is added to HFC-365mfc and a hydrocarbon is further dissolved to improve detergency. HFC-365mfc alone is difficult to dissolve in petroleum solvents, but by adding HFO-1233zd(z) to this HFC-365mfc, it becomes soluble in petroleum solvents. The following experiment has revealed that the degreasing power can be effectively enhanced by further dissolving a hydrocarbon, which is a petroleum-based solvent, in this mixed solvent.

In addition, since hydrocarbons are inexpensive, by adding them to the mixed solution of HFC-365mfc and HFO-1233zd(z), it is possible to obtain a low-cost cleaning solvent with excellent degreasing power. can expand the scope of application to

Here, HFO-1233zd(z) was added to HFC-365mfc, and the following test was conducted in order to confirm the ability of the mixed solvent in which hydrocarbons were dissolved to remove oil from the object to be cleaned.
Test 1: Regarding compatibility of mixed solvents
(Mixing test of HFC-365mfc and hydrocarbon)
When 150 ml of HFC-365mfc and 150 ml of hydrocarbon were mixed at room temperature, the two liquids hardly dissolved and separated into two layers.
(HFC-365mfc, HFO-1233zd(z), and hydrocarbon mixture test)
150 ml of HFC-365mfc, 150 ml of HFO-1233zd(z) and 50 ml of hydrocarbon were mixed at room temperature.

Test 2: Ability to remove oil adhering to the object to be cleaned by mixed solvent (object to be cleaned)
50mm x 50mm SUS flat plate (cleaning solvent)
(a) HFC-365mfc
(b) HFO-1233zd(z)
(c) Mixed solvent of HFC-365mfc and HFO-1233zd(z) at a mixing ratio of 1:1
(d) Mixed solvent (processing oil) with a mixing ratio of 3:3:1 of HFC-365mfc, HFO-1233zd(z) and hydrocarbon
Latus 150 (manufactured by Japan Energy Co., Ltd.)
(Test method)
1 Immerse the object to be cleaned in a working oil bath at room temperature.
2 Remove the object to be cleaned from the processing oil bath and drain the oil until the oil stops dripping.
3. After draining the oil, the object to be cleaned is immersed in each of the above cleaning solvents (a) to (d) and rocked for 3 minutes.
4 Drain and dry.
5. Visually (with the naked eye) confirm whether or not processing oil remains on the object to be cleaned.

As a result of the above test, it was confirmed that the cleaning solvent (a) HFC-365mfc could hardly dissolve the processing oil that had adhered to the object to be cleaned when the oil was removed. When the cleaning solvent (b) HFO-1233zd(z) was used, no processing oil remained on the object to be cleaned when the oil was removed. In addition, when using a mixed solvent (c) HFC-365mfc and HFO-1233zd(z) at a mixing ratio of 1:1, the processing oil that adhered to the object to be cleaned when the oil was removed was partially removed. confirmed to remain. Also, when using a mixed solvent (d) HFC-365mfc, HFO-1233zd(z) and hydrocarbon in a mixing ratio of 3:3:1, the processing oil adhering to the object to be cleaned remains. I didn't.

From the above results , by adding HFO-1233zd(z) to HFC-365mfc and further dissolving the hydrocarbon, the processing oil adhering to the object to be cleaned was It became clear that dissolution and removal can be performed more effectively than a mixed solvent with. Therefore, it is possible to obtain a mixed solvent that can easily remove highly viscous contaminants such as press oil and wringing oil.

In addition, by increasing the mixed amount of HFO-1233zd(z) than HFC-365mfc, the above mixed solvent can be used as HFC-365mfc and HFO-1233zd(z). The rate of global warming can be reduced compared to when the amount of HFC-365mfc is the same as that of HFO-1233zd(z), or when the amount of HFC-365mfc is greater than that of HFO-1233zd(z).

In the present invention, a mixed solvent of HFC-365mfc and HFO-1233zd(z) with a small boiling point difference is stored inside, and a cooling mechanism for cooling the cleaning vapor of the mixed solvent is provided on the opening side. , a cleaning tank for liquid cleaning, steam cleaning, and/or autothermal drying of an object to be cleaned; A steam generation tank provided with a transfer pipe for transferring steam to the cleaning tank, and a steam generation tank provided between the steam generation tank and the cleaning tank and capable of recovering the mixed solvent from the cleaning tank into the steam generation tank. and a recovery tube.

The present invention is configured as described above, and the boiling point of HFC-365mfc is 40.2°C, and the boiling point difference of HFO-1233zd(z) is 39°C. As a result, vapors are generated almost at the same time, so that the situation in which only one of the liquids evaporates is unlikely to occur, and the mixing ratio of each liquid in the mixed solvent does not change significantly. Therefore, the properties of the mixed solvent can be kept constant, making it easier to manage the mixed solvent, and cleaning can be performed using existing equipment without the need for special equipment, reducing cleaning costs. It is possible to make it inexpensive.

In addition, when this mixed solvent is distilled for reuse after liquid cleaning with the mixed solvent of the present invention or the above cleaning, distillation and regeneration can be performed almost at the same time. Since the distilled regenerated liquid can be recovered by the same procedure, the mixed solvent can be easily reused in the same way as the single solvent, which contributes to a sustainable society.

By changing the mixing ratio of HFC-365mfc and HFO-1233zd(z), it is possible to obtain a mixed solvent suitable for the purpose of use. For example, the mixing ratio of HFC-365mfc and HFO-1233zd(z) can be changed to adjust the strength of the degreasing power, or the mixing ratio of HFO-1233zd(z) can be increased to reduce the burden on the environment. Furthermore, by increasing the mixing ratio of HFC-365mfc, the mixed solvent can be made inexpensive.

BRIEF DESCRIPTION OF THE DRAWINGS The conceptual diagram of Example 1 which shows this invention.

Embodiment 1 of the present invention will be described with reference to FIG. A first cooling pipe (3) is provided, and a second cooling pipe (4) is provided on the bottom side. A steam generation tank (5) is provided next to the washing tank (1) as shown in FIG. A third cooling pipe (7) is provided on the opening (6) side of the steam generation tank (5), and a heater (8) and a temperature sensor (10) constituting the heating mechanism of the present invention are provided on the bottom side. is provided.

A transfer pipe (12) having an on-off valve (11) is provided between the steam generation tank (5) and the cleaning tank (1) so that the two can communicate with each other. In addition, below the transfer pipe (12), between the cleaning tank (1) and the steam generation tank (5), from the cleaning tank (1) toward the bottom side of the steam generation tank (5) A collection pipe (13) inclined as shown is provided, and the washing tank (1) and the steam generation tank (5) are in constant communication through the collection pipe (13).

A cleaning method using the cleaning apparatus for the object to be cleaned (15) constructed as described above will be described below. First, in the cleaning tank (1), a mixed solvent (16) obtained by mixing HFC-365mfc and HFO-1233zd(z) is contained, and the second cooling pipe (4) in the cleaning tank (1) ) to cool the mixed solvent (16). Here, HFC-365mfc has a boiling point of 40.2°C and HFO-1233zd(z) has a boiling point difference of 39°C. do. Therefore, it is unlikely that only one of the liquids evaporates, and the mixing ratio of the liquids in the mixed solvent (16) does not change significantly. 16) can be easily managed.

The mixing ratio of each solvent can be appropriately changed according to the purpose of use. For example, the mixing ratio of HFC-365mfc and HFO-1233zd(z) can be changed to adjust the strength of the degreasing power, or the mixing ratio of HFO-1233zd(z) can be increased to reduce the burden on the environment. Further, by increasing the mixing ratio of HFC-365mfc, the mixed solvent (16) can be made inexpensive.

In this example, the mixed solvent (16) in which HFC-365mfc and HFO-1233zd(z) are mixed is used. Further, by dissolving a hydrocarbon, which is a petroleum solvent, it is possible to effectively enhance the degreasing power. Furthermore, since hydrocarbons are inexpensive, by adding them to the mixture of HFC-365mfc and HFO-1233zd(z), it is possible to obtain a low-cost cleaning solvent with excellent degreasing and cleaning power. The scope of application to (15) can be expanded.

Similarly, the steam generation tank (5) contains a mixed solvent (16) having the same mixing ratio as the mixed solvent (16) contained in the cleaning tank (1) as described above. Then, by heating the mixed solvent (16) in the steam generation tank (5) with the heater (8) to the boiling point of HFC-365mfc and HFO-1233zd(z) or higher, the inside of the steam generation tank (5) The cleaning steam (17) of the mixed solvent (16) is generated in advance. The temperature of the mixed solvent (16) is constantly controlled by the temperature sensor (10).

A method for cleaning the object to be cleaned (15) using the cleaning apparatus configured as described above will be described below. First, the mixed solvent (16) in the washing tank (1) is cooled by the second cooling pipe (4). In addition, with the on-off valve (11) of the transfer pipe (12) closed, the heater (8) of the steam generation tank (5) is operated to convert the mixed solvent (16) in the steam generation tank (5) into HFC. -365mfc and HFO-1233zd(z) are heated to above the boiling point to generate cleaning vapor (17) of the mixed solvent (16) in advance.

In such a state, the object to be cleaned (15) is immersed in the mixed solvent (16) in the cleaning tank (1) for liquid cleaning. After the liquid cleaning is completed, the object to be cleaned (15) is placed above the liquid surface (14) of the mixed solvent (16) as shown in FIG. By opening the on-off valve (11) of the transfer pipe (12), the cleaning steam (17) generated in the steam generation tank (5) is transferred into the cleaning tank (1). As a result, the cleaning steam (17) flowing into the cleaning tank (1) comes into contact with the object to be cleaned (15), and the object to be cleaned (15) is steam cleaned. After completion of this steam cleaning, the object to be cleaned (15) is moved to a position near the opening (2) of the cleaning tank (1) as shown in FIG. 1, and autothermal drying is performed at that position. This completes a series of cleaning operations.

Here, the cleaning steam (17) in the cleaning tank (1) used for steam cleaning is distilled and liquefied by the first cooling pipe (3) provided in the cleaning tank (1). is recovered in a mixed solvent (16) of During the liquid cleaning, the object to be cleaned (15) is cooled by the mixed solvent (16) in the cleaning tank (1), so the cleaning steam (17) adhering to the object to be cleaned (15) is also cooled. The condensate condenses on the surface of the object (15) to be cleaned, drops into the mixed solvent (16), and is collected together with the dirt adhering to the object (15).

When the liquid level (14) of the mixed solvent (16) in the cleaning tank (1) rises due to the liquefaction recovery of the cleaning steam (17) as described above, the liquid level (14) rises to the recovery pipe (13). ), it overflows and is recovered from the recovery pipe (13) into the steam generation tank (5).

Then, the mixed solvent (16) recovered in the steam generation tank (5) as described above is heated again to become cleaning steam (17), transferred to the cleaning tank (1), and used again for steam cleaning. become a thing. Thus, in this embodiment, the mixed solvent (16) used for liquid cleaning and/or steam cleaning of the object (15) to be cleaned can be recycled by distillation. Since the boiling point difference is small at 2°C and HFO-1233zd(z) at 39°C, it is possible to recover the distillate regenerated liquid by the same procedure as when using it alone, even though it is a mixed solvent (16). Therefore, the mixed solvent (16) can be reused and washed as easily as in the case of a single unit without using a special device.

REFERENCE SIGNS LIST 1 cleaning tank 2 opening 3 first cooling pipe 5 steam generation tank 8 heater 12 transfer pipe 13 refrigerant gas 13 recovery pipe 15 object to be cleaned 16 mixed solvent 17 cleaning steam

Claims (1)

A mixed solvent of HFC-365mfc and HFO-1233zd(z) with a small boiling point difference is stored inside, and a cooling mechanism is provided on the opening side to cool the cleaning steam of the mixed solvent. a cleaning tank for performing liquid cleaning, steam cleaning, and/or autothermal drying; and a heating mechanism that stores the mixed solvent and heats the mixed solvent to generate cleaning steam. a steam generation tank provided with a transfer pipe for transferring to the tank; and a recovery pipe provided between the steam generation tank and the cleaning tank and capable of recovering the mixed solvent from the cleaning tank into the steam generation tank. A cleaning device for an object to be cleaned, comprising:

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