JPH08108154A - Cleaning method and cleaning agent - Google Patents

Abstract

PURPOSE: To improve various properties for cleaning organic stains and cleaning work safety by making the upper layer of cleaning agent liquid an aqueous phase in which the content of organic substances containing halogen atoms in a cleaning agent is lower than that of the lower layer, making the lower layer an oil phase in which the content is higher than that of the upper layer, and contacting articles to be cleaned with the oil phase. CONSTITUTION: A cleaning agent which contains organic substances having halogen atoms which is characterized by phase separation, or its aqueous solution is used. The upper layer of cleaning agent liquid in a cleaning tank is made to be an aqueous phase in which the content of organic substances from the cleaning agent is lower than that of the lower layer of the liquid. The lower layer of the liquid is made to be an oil phase in which the content of organic substances from the cleaning agent is higher than that of the upper layer. Articles 1 to be cleaned are cleaned by being contacted with the oil layer in the lower layer part. This phase is formed by a method in which the cleaning agent or its aqueous solution is allowed to stand at 20-100 deg.C for 30 min, and the aqueous layer in the upper layer part and the oil phase in the lower layer part are separated, formed, and then washed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition used for cleaning hard surfaces such as glass, ceramics, metals and plastics, and a cleaning method. In particular, processing oils such as oils and fats, machine oils, quenching oils, greases, cutting oils, waxes, liquid crystals, fluxes, mechanical parts, electrical parts, electronic parts, and various precision parts to which dirt such as abrasion powder and cutting powder adheres. And a cleaning composition used for cleaning jigs and tools used in assembling or processing these parts (hereinafter referred to as machines and precision parts), and a cleaning method, more specifically, in a cleaning tank of a cleaning machine. , An aqueous phase with a small amount of detergent-derived organic matter is formed in the upper layer of the liquid, and an oil phase with a large amount of detergent-derived organic matter is formed in the lower layer of the liquid so that the object to be washed comes into contact with the oil phase. TECHNICAL FIELD The present invention relates to a cleaning agent composition used in a cleaning method characterized by cleaning and a cleaning method.

[0002]

2. Description of the Related Art Conventionally, processing oils such as oils, fats, machine oils, quenching oils, greases, cutting oils, etc., waxes, liquid crystals, fluxes, abrasion powders, cutting powders, and other contaminants have adhered. Excellent cleaning power for cleaning hard surfaces such as glass, ceramics, metals and plastics such as mechanical parts, electric parts, electronic parts, various precision parts and jigs and tools used for assembling or processing these parts. Freon solvents such as trichloroethane or trichlorotrifluoroethane, which have workability, have been used.

However, in these trichloroethane and freon-based cleaning agents, the main components of the solvent evaporate into the atmosphere,
It is revealed that the diffusion of the ozone layer may damage the global environment due to the destruction of the ozone layer, etc., and the complete abolition of its production and use or its use regulations are being studied or being implemented.

In response to such movements, various alternative cleaning agents or cleaning techniques that can replace these trichloroethane and CFC-based cleaning agents are being proposed. For example,
A method of washing with a hydrocarbon solvent such as kerosene, toluene, xylene, or a petroleum solvent, or a detergent in which an appropriate amount of a surfactant is added to them, glycols or a liquid low-viscosity nonionic surfactant alone. , Or a method of washing with a detergent concentrate containing a small amount of water, a method of diluting a detergent containing a surfactant or a builder with a large amount of water,
Etc. are mentioned as a typical example. However, these cleaning agents or cleaning methods all have the following problems from the viewpoints of cleaning performance, cleaning work environment and the like.

For example, with the hydrocarbon solvents exemplified above, organic substances such as glycols and liquid low viscosity nonionic surfactants, or cleaning liquids containing a small amount of water for preventing flammability. The method of washing is washing with a washing liquid in which organic substances form a continuous phase. It exhibits excellent detergency against organic stains having a wide range of physical properties, from parts with liquid organic substances such as machine oil and metal working oil to parts with viscous or solid organic substances such as grease or flux. It is considered that this is because the organic substance is a continuous phase, and therefore, a cleaning mechanism is adopted in which the organic dirt is dissolved and removed in the cleaning liquid as in the case of freon and trichloroethane. However, since the continuous phase of these and other cleaning methods is an organic matter, there is a risk of fire and explosion due to ignition or a risk of deterioration of the work environment due to evaporation of volatile organic components such as hydrocarbon solvents and glycols. . In addition, for cleaning agents containing an appropriate amount of water to prevent flammability, there is no risk of fire if the water content during cleaning is properly controlled, but there are analytical instruments for water management, hydration equipment or The burden on both the financial side and the human side such as manpower for management is required, and the problem of deterioration of working environment due to evaporation of organic components, which is another issue, cannot be solved yet.

On the other hand, a method of diluting a detergent containing a surfactant or a builder with a large amount of water and using the same is as follows.
There is no danger of fire or deterioration of the work environment due to evaporation of organic components, and it can be said to be a preferable cleaning method from the viewpoint of maintaining the cleaning work environment. However, since this method is a method of cleaning with a cleaning solution in which water forms a continuous phase, unlike a cleaning mechanism that dissolves and removes organic stains such as water, a surfactant in water adheres to the component or its part. It is mainly composed of a cleaning mechanism that adsorbs to organic stains, reduces their interfacial tension, promotes self-aggregation of organic stains, and removes them by rolling up. Therefore, the cleaning power for viscous grease and solid dirt such as flux and wax is
It is significantly inferior to a detergent that is washed due to dissolution such as mist.

[0007] Therefore, excellent cleaning properties against organic stains of various physical properties such as a cleaning agent due to the dissolution mechanism exemplified above, and non-flammability, low evaporation, etc. possessed by the water-diluted cleaning agent exemplified above. It has been desired to develop a cleaning agent and a cleaning method having both functions of cleaning work safety.

[0008] In such a situation, the applicant of the present invention uses a detergent characterized by phase separation or an aqueous solution of the detergent, and in the washing tank of the washing machine, the organic substance content derived from the detergent is contained in the upper layer of the liquid. Is less than the lower layer of the liquid,
A step of forming an oil phase in which the content of organic substances derived from the detergent is higher in the lower layer of the liquid than in the upper portion of the liquid, and washing the object to be cleaned in contact with the oil phase, and the upper surface of the aqueous phase. An application has already been filed for a cleaning method characterized by having a step of rinsing and cleaning an object to be cleaned while spraying or spraying water from the prepared liquid injection port, and a detergent composition used for the cleaning method (Japanese Patent Application No. Hei 10 (1999) -135242). 6-74254). However, the detergent composition used here is preferably a compound that essentially does not contain a halogen atom, but since it is difficult to increase the specific gravity, it takes time to separate the water phase and the oil phase. There was room for improvement in these points.

Accordingly, the object of the present invention is to obtain excellent cleaning properties against organic stains of various physical properties, especially when used in the above cleaning method, and at the same time, excellent cleaning work safety such as non-flammability and low evaporation property. It is intended to provide a cleaning composition and a cleaning method that can secure the property.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted diligent research in view of such circumstances, and as a result, in the above cleaning method, an organic compound having a halogen atom directly bonded to a carbon atom is used as a cleaning component. At the same time, they have found that the above objects can be achieved by appropriately adjusting the phase separation performance, and completed the present invention.

That is, the gist of the present invention is (1) using a cleaning agent containing an organic substance containing a halogen atom characterized by phase separation or an aqueous solution of the cleaning agent, in a cleaning tank of a cleaning machine. An aqueous phase in which the content of the organic substance derived from the detergent is lower than that in the lower layer of the liquid, and an oil phase in which the content of the organic substance derived from the detergent is higher than that of the upper layer of the liquid is formed in the lower layer of the liquid. A cleaning method which comprises cleaning an object to be cleaned in contact with the oil phase, (2) an organic compound having a halogen atom directly bonded to a carbon atom in a cleaning agent component as an essential component, When the cleaning agent or an aqueous solution of the cleaning agent is allowed to stand at a temperature of 20 to 100 ° C. for 30 minutes, an aqueous phase having a lower content of organic substances derived from the cleaning agent in the upper layer of the liquid than in the lower layer of the liquid, The organic material content derived from the cleaning agent is in the upper layer A detergent composition which is phase-separated so as to form more oil phase and is used in the washing method described in (1) above, (3) having a halogen atom directly bonded to a carbon atom The boiling point of the organic compound is
The detergent composition according to (2) above, which is 100 ° C. or higher at 1 atm, (4) The detergent, or an organic substance contained when the detergent aqueous solution is allowed to stand at a temperature of 20 to 100 ° C. for 30 minutes. 50% by weight or more forms an oil phase and separates from the water phase, and the specific gravity of the oil phase is larger than that of the aqueous phase,
Therefore, an aqueous phase is formed in the upper layer and an oil phase is formed in the lower layer, the cleaning composition according to the above (2) or (3),
(5) The detergent composition according to (4), wherein 80 to 99.9% by weight of the contained organic matter forms an oil phase and is separated from the aqueous phase, (6) carbon atoms in the organic component of the detergent. 30% by weight of an organic compound having a halogen atom directly bonded to
The cleaning composition according to any one of (2) to (5) above, including (7) the organic component of the cleaning agent, and having an average HLB of 7-1.
The cleaning composition according to any one of (2) to (6) above, which comprises 0.1 to 30% by weight of the nonionic surfactant of No. 5.

The detergent composition of the present invention comprises an aqueous phase containing a small amount of the organic material derived from the detergent in the upper layer of the liquid and an organic content of the detergent derived in the lower layer in the cleaning tank of the washing machine. A detergent composition that can be used in a cleaning method in which a large amount of oil phase is formed and the object to be cleaned is brought into contact with the oil phase, and a halogen atom directly bonded to a carbon atom is contained in the cleaning agent component. When the cleaning agent or an aqueous solution of the cleaning agent is allowed to stand for 30 minutes at a temperature of 20 to 100 ° C., the organic compound content of the cleaning agent is higher than that of the lower layer section. It is characterized in that a small amount of an aqueous phase is phase-separated so as to form an oil phase having a higher content of organic substances derived from a detergent in the lower layer of the liquid than in the upper layer.

In the detergent composition of the present invention, when a detergent or an aqueous solution of the detergent is left to stand, the contained organic matter forms an oil phase and is separated from the water phase, and the specific gravity of the oil phase is It is necessary to contain an organic substance having a property of forming an aqueous phase in the upper layer and an oil phase in the lower layer, which is larger than the specific gravity of the aqueous phase.

Examples of organic substances having such characteristics include organic compounds containing halogen atoms such as fluorine, chlorine, bromine or iodine in the molecule. By including a halogen atom as a constituent element in an organic molecule in this way, the specific gravity of the organic molecule is increased, and the cleaning ability for organic stains is increased. Depending on the content, the flame retardancy of the cleaning agent alone is also high. Can be given. In order to use it as a detergent, it is desirable that even under severe washing conditions, the halogen atom is difficult to desorb from the organic molecule due to decomposition reaction, etc., and it is desirable that it exists in a more stable bond state. Must be directly bonded to a carbon atom. This ensures chemical stability under various washing conditions.

These organic compounds include chain hydrocarbons, aromatic or alicyclic hydrocarbons, hydrocarbons containing aromatic or alicyclic hydrocarbons, alcohols derived from them, fatty acids and amines, A part or all of the hydrogen atoms bonded to carbon atoms such as ethers, esters, ketones and amides, which are reaction products of them, and alcohols, fatty acids, alkylene oxide adducts such as ethylene oxide and propylene oxide of amines, are halogen. Examples include compounds substituted with atoms.

Some or all of the hydrogen atoms bonded to the carbon atoms of chain hydrocarbons, aromatic or alicyclic hydrocarbons, and hydrocarbons containing aromatic or alicyclic hydrocarbons have been replaced with halogen atoms. Specific examples of the compound include chlorocyclohexane, dichlorobenzyl, dichloroxylene, chlorotoluene, chlorinated naphthalene, bromobenzene, dibromobenzene, trichlorobenzene, fluorostyrene, fluorotoluene, 1,5-dichloropentane, 1,4- Dibromobutane, octyl bromide and the like can be mentioned.

Alcohols and fatty acids derived from chain hydrocarbons, aromatic or alicyclic hydrocarbons, hydrocarbons containing aromatic or alicyclic hydrocarbons, and ethers and esters which are reaction products of them. Specific examples of the ketone include chlorobenzyl alcohol, 2,3-dibromo-1-propanol, fluorophenol, chlorophenol, dichlorophenol, p-chloroacetophenone, methyl o-bromobenzoate, ethyl 2-bromoisobutyrate and deca. Examples include bromodiphenyl ether and α-bromobutyric acid.

Also, chlorobenzyl alcohol, 2,3
-Dibromo-1-propanol, fluorophenol,
OH possessed by chlorophenol, dichlorophenol, etc.
Examples thereof include compounds obtained by addition-polymerizing ethylene oxide or propylene oxide as a group in a range that does not impair the properties that the cleaning composition of the present invention should have.

Among these, especially R ₁ X (AO) _n YR
_The compound represented by ₂ is preferable, and a detergent containing 30% by weight or more of them in the detergent composition is preferable. Where R
₁ ; a phenol derivative having 6 to 18 carbon atoms, R ₂ ; a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, X: any one of an ether group, an ester group and an amino group, Y: an ether group, an ester group Or (AO); an alkylene oxide having 2 to 4 carbon atoms, n; an average addition mole number of (AO), and a value of 1 to 20. The halogen atom-containing compounds may be used alone or in combination of two or more.

The halogen atom-containing organic compound which is the detergent composition of the present invention has a boiling point of 100 ° C. at 1 atm.
It is preferably at least 150 ° C., more preferably at least 150 ° C. From the viewpoint of protecting the global environment or not deteriorating the working environment, it is not preferable that the cleaning agent component volatilize in the cleaning or drying process.

Further, in order for the cleaning agent of the present invention to sufficiently retain the characteristics of the halogen atom-containing organic compound, that is, the large specific gravity, the excellent cleaning property, or the flame retardancy, 30% by weight in organic components of detergent
The above is preferably the halogen atom-containing organic compound described above, and more preferably 50 to 100% by weight.

The detergent or the detergent aqueous solution used in the present invention needs to be phase-separated so as to form an aqueous phase in the upper layer and an oil phase in the lower layer. The aqueous phase of the upper layer and the oil phase of the lower layer are separated from each other. In order to obtain the two-liquid layer efficiently and in a short time, when the cleaning agent or the cleaning agent aqueous solution is allowed to stand at a temperature of 20 to 100 ° C. for 30 minutes, 50% by weight or more of the contained organic matter forms an oil phase. It is better to separate from the aqueous phase to form an oil phase under the aqueous phase, and more preferably, a detergent that can separate 80% by weight or more of organic matter from the aqueous phase. The greater the separation rate of organic matter, the less organic matter remains in the aqueous phase, which is preferable because it can reduce environmental deterioration factors such as fire and odor.
Further, in consideration of the rinsability after washing, it is better that the detergent is appropriately dissolved in water, and in that sense, the upper limit of the separation rate is preferably 99.9% by weight or less, and particularly preferably 99% by weight or less.

In order to improve the durability of the cleaning agent against stains or the rinsing property at the time of rinsing with water, in the organic component of the cleaning agent, other than the above-mentioned halogen atom-containing compound,
Average HLB 7-15 nonionic surfactant 0.1-3
By including 0% by weight, more preferable detergency can be obtained,
More preferably, it is 1 to 15% by weight.

As the nonionic surfactant used,
For example, ether type such as alkyl ether type and alkyl allyl ether type; alkyl ester type; condensation type with amine such as polyoxyalkylene alkylamine; condensation type with amide such as polyoxyalkylene alkyl amide;
Examples thereof include pluronic or tetronic type polyoxyethylene and polyoxypropylene, which are random or block-condensed; and polyethyleneimine-based surfactants.

In the present invention, the organic matter means TOC (Total
Organic Carbon, total organic carbon). This TOC value is basically JIS-
K0102 Measured by combustion-infrared analysis method described in "Organic carbon (TOC)" in "Factory wastewater test method", for example, TOC-500 manufactured by Shimadzu Corporation.
Can be used for measurement. The separation rate of organic substances in the cleaning solution or the cleaning solution which is an aqueous solution of the cleaning agent is the TOC value of the cleaning solution in the lower layer of the cleaning solution divided by the sum of the TOC value of the cleaning solution in the lower layer and the TOC value of the cleaning solution in the upper layer. , The value multiplied by 100 is expressed in%.

The cleaning agent used in the present invention is an organic or inorganic chelating agent within a range that does not impair the effects of the present invention.
A builder, a silicone oil-based defoaming agent, an amine-based antirust agent, alkanolamines such as diethanolamine and methyldiethanolamine, alcohols, petroleum-based solvents and the like may be appropriately added. The cleaning composition of the present invention is used for cleaning by itself or as an aqueous solution thereof,
When used alone, the detergent composition contains water in advance, and when used as an aqueous solution, it does not contain water or contains a relatively small amount of water.

The cleaning method of the present invention uses the above cleaning composition, and in the cleaning tank of the cleaning machine, an aqueous phase containing less organic material derived from the cleaning agent in the upper layer of the liquid than in the lower phase, It is characterized in that an oil phase having a higher content of organic substances derived from the detergent than the upper phase portion is formed in the liquid lower layer portion, and the object to be washed is brought into contact with the oil phase for washing. When cleaning the machine to be cleaned, such as precision parts, the cleaning liquid consisting of the cleaning agent of the present invention or an aqueous solution of the cleaning agent is an upper layer of an aqueous phase having a low content of organic substances derived from the cleaning agent, which is a concentrated cleaning agent liquid. It is carried out by immersing the machine and precision parts for a certain period of time in a liquid having an oil phase as a lower layer. At this time, in order to obtain sufficient detergency, it is better for the entire machine, precision parts, which are the objects to be cleaned, to contact the oil phase of the lower layer, and if it can be sufficiently immersed in the oil layer, better detergency can be obtained. You can
The oil phase may be continuous or may be in the form of oil droplets, but it is more preferable to wash in a state containing the continuous oil phase from the viewpoint of detergency and the viewpoint of maintaining the cleaning work environment.

FIG. 1 shows an example of a schematic diagram of a cleaning tank of a cleaning machine used in the cleaning method of the present invention. Ultrasonic irradiation, stirring, submerged jet, etc. are applied to a cleaning solution which is a cleaning agent or an aqueous solution of the cleaning agent. By applying the mechanical force or the physical force of the above to wash, better washability can be obtained. FIG. 1 shows an example in which a water phase and an oil phase are circulated by a pump to stir the inside of each phase. It is preferable to add mechanical force and the like within a range in which the oil phase of the lower layer does not appear on the surface of the upper layer, which is the water phase, because it has less odor and the like and is preferable for maintaining the cleaning work environment.

From the viewpoint of cleaning efficiency, it is preferable to set the depth of the oil phase in the cleaning tank to a depth at which the entire machine or precision parts can be immersed. From the viewpoint of maintaining the cleaning work environment, the depth of the water phase should be more than the depth of covering the oil phase surface, but when rinsing with the water phase, the entire machine and precision parts can be almost immersed. It is preferable to secure the depth of. Oily dirt and solid dirt mixed in the water phase are preferably used while being removed while being removed by various removing devices such as a filter and an oil / water separating device installed in the circulation system, because better detergency can be maintained.

In order to rinse and wash the machine or precision parts which are the objects to be cleaned, one to a plurality of liquid injection ports (nozzles), usually 1 to 20 are provided above the surface of the water phase in the cleaning tank, and the rinse is performed from there. When rinsing machines and precision parts while spraying or spraying water, rinsing can be sufficiently performed even if the depth of the water phase is shallow, and as a result, the entire cleaning device can be made smaller and more compact. The rinsing water used here is either pure water, city water, or circulating water having a water phase as shown in FIG. 1, an oil / water separation device such as activated carbon or membrane separation, or water regenerated by vaporization. Good. If necessary, it is possible to inject the lower oil layer from this nozzle while circulating it with a pump.

One of these cleaning tanks may be used, or a plurality of cleaning tanks of the same cleaning method may be arranged side by side, and if necessary, the cleaning tank may be used in combination with a known conventional cleaning method. You may. Further, the in-line method of continuously cleaning the object to be cleaned while conveying the object to be cleaned by a belt conveyor or the like may be used, or the barrel method may be used, and all known cleaning methods are applicable.

The cleaning composition and the cleaning method of the present invention can be used for cleaning hard surfaces such as glass, ceramics, metals and plastics. In particular, it has a particularly excellent effect when cleaning mechanical parts, electric parts, precision parts and jigs and tools used in the assembly process.
Here, the precision parts refer to, for example, electronic parts, electrical parts, precision machine parts, resin processed parts, optical parts and the like. Electronic parts are, for example, printed wiring boards used in computers and their peripheral devices, home appliances, communication devices, OA devices, and other electronic application devices; used as contact members for IC lead frames, resistors, capacitors, relays, etc. Hoop material;
Liquid crystal displays used in office automation equipment, watches, computers, toys, home appliances, etc .; video / audio recording / reproducing parts, magnetic recording parts used in related parts, etc .; semiconductor materials such as silicon and ceramic wafers; quartz. Parts for electrostriction such as vibrators; photoelectric conversion parts used in CDs, PDs, copying machines, optical recording machines, etc. The electromagnetic parts refer to, for example, electric motor parts such as brushes, rotors, stators and housings; ticket issuing parts used in vending machines and various devices; currency inspection parts used in vending machines, cash dispensers and the like. Precision equipment parts include, for example, bearings used in precision drive equipment, video recorders, etc .; machining parts such as cemented carbide chips. The resin-processed parts refer to precision resin-processed parts used in, for example, cameras and automobiles. Further, the optical component refers to, for example, a lens used in a camera, spectacles, an optical device, and the like, and other components include, for example, a spectacle frame, a watch case, a watch belt, and the like. Equipment parts include gears, camshaft springs, shafts used in automobile engines and drive parts,
A bearing, etc. Electrical parts include motors such as video, plastic products, electron guns, shadow masks, etc. Also, with the jigs and tools used in the assembly process, manufacturing precision parts as shown in the above-mentioned various parts examples,
In addition to jigs and tools handled in various processes such as molding, processing, assembly, and finishing, it refers to various equipment that handles these precision parts, parts thereof, and the like.

Among the above, the cleaning composition and the cleaning method of the present invention exhibit suitable performance especially when cleaning the liquid crystal adhered to the printed wiring board or the glass substrate where the flux remains. Machines and precision parts to be cleaned are not limited to these examples, and various interfering substances such as processing oil and flux in the assembling process, or various kinds of products that deteriorate the characteristics of the product can be used. The cleaning composition and cleaning method of the present invention can be used for machines and precision parts having a solid surface of a certain shape to which oily contaminants are attached. These contaminants include, for example, fats, machine oils, quenching oils, cutting oils,
The characteristics of the cleaning composition and the cleaning method of the present invention are particularly exhibited when it is mainly organic oil such as grease, liquid crystal, and rosin-based flux wax. further,
Dirt mixed with metal powder, inorganic powder, and the like is also removed together with the removal of the organic oil component, and therefore can be satisfactorily washed.

[0034]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Examples 1 to 5 and Comparative Examples 1 to 3 A detergent composition having the composition shown in Table 1 was prepared, diluted with ion-exchanged water so that the organic matter content was 50% by weight, and washed. 7 liters of the aqueous solution of the agent was placed in a washing machine (a washing tank is shown in FIG. 1) equipped with an ultrasonic oscillator and a stirrer having a capacity of 10 liters, and left still at a temperature of 70 ° C. for 30 minutes.

After standing for 30 minutes, the surface of the cleaning liquid and the lower layer of the cleaning liquid in the cleaning tank were sampled, and the content of organic substances in the cleaning liquid was measured from the TOC value (TOC-500 manufactured by Shimadzu Corporation) was used to determine the separation rate. Was calculated. Table 1 shows the results.

[0037]

[Table 1]

At this time, in Examples 1 to 5, 50% by weight or more of the organic matter contained at 70 ° C. was separated from the aqueous solution, and the upper layer was the aqueous phase and the lower layer was the concentrated cleaning agent oil. It was confirmed to form a phase. Also, 20 to 100 ° C
When the separation was observed in the same manner by changing the temperature in Example 1, good separability was exhibited at a temperature of 40 ° C or higher in Example 1 and at a temperature of 20 ° C or higher in the other cases. With the above, the odor derived from the cleaning agent generated from the cleaning liquid was significantly reduced after the separation as compared with that before the separation. On the other hand, in Comparative Examples 1 and 2, 50% by weight or more of the organic substance was separated from the aqueous solution at a certain temperature or higher between 20 to 100 ° C., but an oil phase was formed in the upper layer and an aqueous phase was formed in the lower layer. Had a stronger odor.

Then, the test liquid 1: naphthene-based mineral oil (40 ° C., 350 ° C.) was used as the cleaning liquid after standing for 30 minutes.
cst) coated steel test piece (10 g / m ² ) (10 cm × 15 cm) or test material 2: grease coated (5 g / m ² ) steel test piece (10 cm × 1)
5 cm) was washed while the test piece was in complete contact with the oil phase. The cleaning is performed at a cleaning temperature of 50 ° C. for 0.5 minutes while applying ultrasonic waves. After cleaning, the test piece is moved to the water phase portion and ultrasonically rinsed for 0.5 minutes, taken out of the cleaning tank, and then at 80 ° C. for 15 minutes. Dry for minutes. The cleanability of the test piece after cleaning is (weight of test piece before cleaning −
Weight of test piece after cleaning) ÷ (weight of test piece before cleaning-weight of test piece itself) is 100
Multiply the value by 90 or more for ◎, 75 to 89 for ◯, 60
˜74 was evaluated as Δ, and less than 60 was evaluated as x. The results are shown in Table 1. As is clear from Table 1, Examples 1 to 5 showed good cleaning properties, but in Comparative Examples 1 and 2, a large amount of the oil phase in the surface layer was not removed when the test piece was pulled out from the cleaning liquid. However, sufficient detergency was not obtained.

When the test piece before drying was rinsed with ion-exchanged water at a pressure of 1 kg / cm ² using a liquid spray nozzle for 0.5 minutes when taken out from the washing tank, Examples 1 to 5 were used. The detergency of 5 was increased by 5 to 20% compared to the case where this operation was not performed.

Next, the cleaning liquid obtained in Example 1 was washed with the same test piece and the same cleaning method as described above while stirring with a stirrer so that the entire cleaning liquid was uniform (Comparative Example 3). As a result, as shown in Table 1, Comparative Example 3
Although the same cleaning agent as in Example 1 was used, the cleaning property was deteriorated.

[0042]

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent the danger of fire and explosion associated with ignition and the deterioration of the working environment such as odor due to the volatilization of organic substances, and it is possible to clean with a concentrated cleaning agent liquid forming an oil phase in the lower layer. Therefore, high cleanability can be secured against various organic stains that are liquid or solid. As a result, a good cleaning effect can be exerted even on inorganic dirt such as abrasion powder mixed with organic dirt.

[Brief description of drawings]

FIG. 1 shows an example of a schematic configuration diagram of a cleaning tank of a cleaning machine used in a cleaning method of the present invention.

[Explanation of symbols]

 1 Work 2 Liquid injection nozzle 3 Pump 4 Regeneration tank 5 Ultrasonic oscillator

Claims (7)

[Claims] 1. A cleaning agent containing an organic substance containing a halogen atom or a cleaning agent aqueous solution characterized by phase separation is used, and in the cleaning tank of a cleaning machine, the cleaning agent derived from the cleaning agent is added to the upper layer of the solution. An aqueous phase having a lower content of organic matter than the lower layer of the liquid is formed in the lower layer of the liquid to form an oil phase having a higher content of the organic material derived from the detergent than the upper layer of the liquid, and the object to be washed is referred to as the oil phase. A cleaning method, which comprises contacting and cleaning. 2. A detergent component containing an organic compound having a halogen atom directly bonded to a carbon atom as an essential component, and a detergent or an aqueous solution of the detergent 20 to 1
When left standing for 30 minutes at a temperature of 00 ° C., an aqueous phase having a lower organic content derived from the detergent than the lower layer part is contained in the upper part of the liquid, and an organic phase derived from the detergent is contained in the lower part of the liquid from the upper layer part. A detergent composition, which is phase-separated so as to form a large amount of oil phase and is used in the cleaning method according to claim 1. 3. The cleaning composition according to claim 2, wherein the boiling point of the organic compound having a halogen atom directly bonded to a carbon atom is 100 ° C. or higher at 1 atm. 4. A cleaning agent or an aqueous solution of the cleaning agent is added to 2 parts.
When left standing for 30 minutes at a temperature of 0 to 100 ° C., 50% by weight or more of the contained organic matter forms an oil phase and is separated from the water phase, and the specific gravity of the oil phase is larger than the specific gravity of the water phase, Therefore, the aqueous composition is formed in the upper layer and the oil phase is formed in the lower layer, and the cleaning composition according to claim 2 or 3. 5. The cleaning composition according to claim 4, wherein 80 to 99.9% by weight of the contained organic matter forms an oil phase and separates from the aqueous phase. 6. The cleaning composition according to claim 2, wherein the organic component of the cleaning agent contains 30% by weight or more of an organic compound having a halogen atom directly bonded to a carbon atom. 7. The average HLB of 7 to 7 in the organic component of the cleaning agent.
The cleaning composition according to any one of claims 2 to 6, which comprises 0.1 to 30% by weight of 15 nonionic surfactants.