JP2011152517A - Drying method of fluorinated hydrocarbon solvent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying method which minimizes loss of a fluorinated hydrocarbon adhered to substances to be washed scattered out of an apparatus over a short period of time. <P>SOLUTION: In a washing apparatus using a fluorinated hydrocarbon solvent, the drying method of the fluorinated hydrocarbon solvent adhered to the substances to be washed is characterized by making the fluorinated hydrocarbon solvent adhered to the substances to be washed evaporate by jetting the superheated vapor of the fluorinated hydrocarbon with a boiling point in a range of 50-150°C to the substances to be washed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to drying of a fluorinated hydrocarbon solvent adhering to an object to be cleaned in a cleaning apparatus using a fluorinated hydrocarbon solvent, and more specifically, fluorination used for cleaning purposes and adhering to an object to be cleaned The present invention relates to a method for drying a hydrocarbon solvent in a short time and to minimize scattering loss to the outside of the apparatus.

Conventionally, as a cleaning apparatus using a fluorinated hydrocarbon solvent, for example, Patent Document 1 and Patent Document 2 are known.
On the other hand, in recent years, from the viewpoint of environmental protection, cleaning devices and cleaning methods are also required to save energy and consumption, and in order to satisfy this, a cleaning method that suppresses scattering outside the cleaning device in an in-line process is desired. Yes.

U.S. Pat. No. 3,881,949 Japanese Patent Publication No. 63-62276

  However, the apparatus disclosed in Patent Document 1 requires a batch cleaning method and requires a long drying time with steam. Recently, in order to prevent the solvent from being taken out and scattered, the object to be washed must be left in the freeboard zone for several tens of seconds to several minutes to dry, and the time remaining in the freeboard zone is several seconds. Such a conventional apparatus cannot respond to a short time cleaning by a continuous method.

  Further, since the apparatus disclosed in Patent Document 2 uses chlorofluoroethane having a dew point of 20 to 50 ° C. as a solvent for drying, a high concentration of “wet solvent vapor” always stays in the upper part of the tank. As a result, there is a problem that the drying speed and the article to be processed are limited.

  Therefore, the present inventor has conducted extensive research to solve the above problems, and as a result, the superheated vapor of fluorinated hydrocarbon having a boiling point in the range of 50 to 150 ° C. is jetted onto the object to be washed for a short time. The present inventors have found that it is possible to dry the fluorinated hydrocarbon solvent in the present invention.

That is, the present invention relates to the following method.
1. In a cleaning apparatus using a fluorinated hydrocarbon solvent, a fluorinated carbonization adhering to an object to be cleaned by injecting the superheated vapor of the fluorinated hydrocarbon having a boiling point in the range of 50 to 150 ° C. onto the object to be cleaned A method for drying a fluorinated hydrocarbon solvent adhering to an object to be cleaned, characterized by evaporating a hydrogen solvent.
2. 1. The fluorinated hydrocarbon is composed of fluorine, carbon and hydrogen. The drying method of the fluorinated hydrocarbon solvent as described.
3. 1. The fluorinated hydrocarbon further contains at least one atom selected from oxygen, nitrogen and sulfur. Or 2. The drying method of the fluorinated hydrocarbon solvent as described.

  According to the present invention, it is possible to vaporize the fluorinated hydrocarbon adhering to the object to be cleaned in a short time, and it is possible to minimize the scattering loss outside the apparatus. The continuous cleaning process can be carried out with minimal scattering loss.

It is the schematic which showed the washing | cleaning apparatus.

The method for drying a fluorinated hydrocarbon solvent according to the present invention is characterized by injecting superheated vapor of fluorinated hydrocarbon onto an object to be washed to evaporate the fluorinated hydrocarbon in a short time.
In the present invention, the “cleaning apparatus using a fluorinated hydrocarbon solvent” means that the fluorinated hydrocarbon solvent is used to continuously reduce the shape of electronic, electrical, mechanical parts, such as small parts of automobiles. A cleaning apparatus for cleaning what is to be produced and cleaned, such as those described in Patent Documents 1 and 2.

  In the present invention, the “fluorinated hydrocarbon” means fluorine and carbon, or fluorine, carbon and fluorine having a boiling point in the range of 50 ° C. to 150 ° C., preferably 50 to 130 ° C., more preferably 50 ° C. to 110 ° C. A compound comprising hydrogen, optionally further comprising at least one atom selected from the group consisting of oxygen, nitrogen and sulfur. Suitable “fluorinated hydrocarbons” in the present invention include, for example, 1,1,1,2,2,3,4,5,5,5-decafluoropentane, 3-H, 4-H-perfluoro. Examples include heptane, methyl trisdecafluorohexyl ether, hexafluoropropyl hexafluorobutyl ether and the like.

  In the present invention, the “fluorinated hydrocarbon” may be cyclic or chain-like, and may be a saturated compound or an unsaturated compound.

  In the present invention, the “fluorinated hydrocarbon” may be a single product or a mixture of two or more. In the case of a mixed product, the mixing ratio is not particularly limited, and may be an optimum mixing ratio suitable for the purpose of washing. Further, if the mixture forms an azeotropic mixture, an azeotropic composition is preferable for maintaining the mixing ratio of the mixture.

  In the present invention, the “fluorinated hydrocarbon” may be a mixture with other solvents, for example, alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone, silicones such as hexamethyldisiloxane, Additives according to the purpose such as esters such as ethyl acetate, glycol ethers such as ethylene glycol monomethyl ether, ethers such as diethyl ether, and the like can be appropriately mixed. The concentration range of the other solvent in the mixture is 1 to 50% by mass, and a composition that maintains nonflammability even when mixed is preferable. Moreover, the azeotropic composition is desirable for the azeotropic mixture.

In the present invention, “superheated steam” is steam having a high calorific value obtained by further heating the steam. When the liquid is heated under a constant pressure, the temperature rises, and when it reaches a certain temperature, it starts to evaporate. However, even if heating is continued, the temperature is constant until all the liquid evaporates. When the liquid and steam coexist, it is called wet saturated steam, and what is completely vaporized is called dry saturated steam, but what is obtained by further heating dry saturated steam and raising the temperature of the steam is superheated steam. .
In the present invention, “drying” means removing the fluorinated hydrocarbon solvent adhering to the object to be washed.

  In the present invention, the “object to be washed” is not particularly limited, but it should be continuously produced and washed in a small shape such as a small part of an automobile such as an electronic / electrical / mechanical part. Things etc.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in more detail, this invention is not limited to these examples.

Example 1
Using a cleaning apparatus as shown in FIG. 1, the time required for drying the fluorinated hydrocarbon solvent on the surface of the object to be cleaned was measured. That is, the apparatus which can inject the superheated fluorinated hydrocarbon in the vapor layer of the apparatus from which the fluorinated hydrocarbon solvent is used from the former shown by patent document 1 was used. 1,1,1,2,2,3,4,5,5,5-decafluoropentane mixed with 4% by weight of ethanol (boiling point 52 degrees, trade name Bertrell® XE, Mitsui Dupont Fluoro) Chemical) is filled in the above-mentioned apparatus, and the bartrel (R) XE in the boiling tank 1 is boiled by the heater 7, and the vaporized bartrel (R) XE is condensed again by the cooling pipe 4 and returned to the ultrasonic tank 2. Returned to the boiling tank due to overflow. In addition, a part of the Bertle (R) XE is sent from the ultrasonic tank to the heater zone 5 by using a pump, and the superheated steam of the Bertel (R) XE is produced and passed through the superheated steam line 6 into the steam layer (R). ) XE superheated steam was injected. The heater zone was adjusted so that the temperature of the superheated steam outlet was about 60 ° C.
The object to be cleaned is immersed in an ultrasonic bath adjusted to 40 ° C. for 30 seconds in advance, and then heated for 3 seconds at a location 50 mm away from the superheated steam injection port of Bartrel® XE. The amount was measured and the time until the object to be washed returned to the mass before the test was measured. As the objects to be cleaned, automotive metal part-1 (needle), automotive metal part-2 (body), and automotive metal part-3 (suction sheet) were used.

As a comparative example, using the same apparatus as in Example 1, let it stand in the steam layer for 3 seconds without injecting superheated steam, quickly take out the object to be washed, and return the object to be washed to the weight before the test. Was measured.
The results are shown in Table 1.

Example 2
4.25 mg of cutting oil (Cut Arbus KZ260, manufactured by Yushiro Chemical Co., Ltd.) was attached to a well-polished stainless steel (SUS304) of 60 mm × 6 mm × 1 mm. The steel is made of 1,1,1,2,2,3,4,5,5,5-decafluoropentane (boiling point 55 degrees, trade name Bartrel (R) XF, Mitsui DuPont Fluorochemical) After injecting superheated steam for 30 seconds, the amount of oil remaining in the steel was measured.
As a comparative example, the same test sample as in Example 2 was sprayed on the vapor (55 degrees) of Bertrell (R) XF for 30 seconds, and then the amount of oil remaining in the test sample was measured.
The results are shown in Table 2.

過熱蒸気を使用した場合、通常蒸気を使用した場合と比較して油分除去率がはるかに高く、短時間での乾燥に加え、短時間での洗浄も達成された。

When superheated steam was used, the oil removal rate was much higher than when normal steam was used, and in addition to drying in a short time, cleaning in a short time was also achieved.

  Since the present invention can vaporize fluorinated hydrocarbons adhering to the object to be cleaned in a short time and can minimize scattering loss to the outside of the apparatus, it is a continuous method in the in-line process of parts, etc. This cleaning process can be suitably used for a cleaning apparatus that can carry out the cleaning process with minimum scattering loss.

1 boiling tank 2 ultrasonic tank 3 steam layer 4 cooling pipe 5 heater zone 6 superheated steam line 7 heater 8 ultrasonic

Claims (3)

  In a cleaning apparatus using a fluorinated hydrocarbon solvent, a fluorinated carbonization adhering to an object to be cleaned by injecting the superheated vapor of the fluorinated hydrocarbon having a boiling point in the range of 50 to 150 ° C. onto the object to be cleaned A method for drying a fluorinated hydrocarbon solvent adhering to an object to be cleaned, characterized by evaporating a hydrogen solvent.   2. The method for drying a fluorinated hydrocarbon solvent according to claim 1, wherein the fluorinated hydrocarbon comprises fluorine, carbon and hydrogen.   The method for drying a fluorinated hydrocarbon solvent according to claim 1 or 2, wherein the fluorinated hydrocarbon further contains at least one atom selected from oxygen, nitrogen and sulfur.

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