JP2732229B2 - Cleaning method and cleaning agent - Google Patents

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, machine parts, electrical parts, electronic parts, or various precision parts to which dirt such as oils and fats, machine oil, quenching oil, grease, cutting oil, etc., wax, liquid crystal, flux, abrasion powder, cutting powder, etc. adhere. And a cleaning composition used for cleaning jigs and the like (hereinafter referred to as machines and precision parts) used for assembling or processing these parts, and a cleaning method, and more specifically, in a cleaning tank of a cleaning machine. In the upper layer of the liquid, an aqueous phase having a low content of organic substances derived from the detergent is formed, and in the lower layer of the liquid, an oil phase having a high content of organic substances derived from the detergent is formed, so that the object to be cleaned comes into contact with the oil phase. The present invention relates to a cleaning composition used in a cleaning method characterized by cleaning, and a cleaning method.

[0002]

2. Description of the Related Art Conventionally, dirt such as oils and fats, machine oils, quenching oils, greases, processing oils such as cutting oils, waxes, liquid crystals, fluxes, abrasion powders, cutting powders and the like have adhered. Excellent cleaning power for cleaning hard surfaces such as glass, ceramics, metals, plastics, etc., for example, mechanical parts, electrical parts, electronic parts, various precision parts and jigs and tools used for assembling or processing these parts A fluorocarbon solvent such as trichloroethane or trichlorotrifluoroethane, which has good workability, has been used.

[0003] However, these trichloroethane and chlorofluorocarbon-based cleaning agents have a problem that solvents as a main component evaporate into the atmosphere,
It has become clear that there is a risk of damaging the global environment due to depletion of the ozone layer, etc., due to its diffusion.

In response to such a movement, various alternative cleaning agents or cleaning techniques that can be substituted for these trichloroethane and chlorofluorocarbon-based cleaning agents are being proposed. For example,
A method of washing with a hydrocarbon solvent such as kerosene, toluene, xylene, petroleum solvent or a detergent containing an appropriate amount of a surfactant added thereto, 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,
And the like are typical examples. However, all of these cleaning agents and cleaning methods have the following problems when viewed from the viewpoint of cleanability, cleaning work environment, and the like.

[0005] For example, organic solvents such as the hydrocarbon solvents, glycols and liquid low-viscosity nonionic surfactants exemplified above, or a washing liquid containing a small amount of water to prevent flammability. The washing method is washing with a washing liquid in which an organic substance forms a continuous phase. In addition, it exhibits excellent detergency against organic dirt having a wide range of physical properties, from parts to which liquid organic substances such as machine oil and metal working oil adhere to parts to which viscous or solid organic substances such as grease or flux adhere. This is presumably because the organic substance is in a continuous phase, and thus a cleaning mechanism is employed in which organic dirt is dissolved in the cleaning liquid and removed as in the case of CFCs and trichloroethane. However, in these cleaning methods, since the continuous phase is organic, there is a risk of fire or explosion due to ignition or a deterioration of the working environment due to evaporation of volatile organic components such as hydrocarbon solvents and glycols. . In the case of cleaning agents containing an appropriate amount of water to prevent flammability, there is no danger of fire if the water content during cleaning is properly controlled, but there is no analytical equipment for water management, water supply equipment or The problem of deterioration of the working environment due to evaporation of organic components, which requires both financial and human burdens, such as manpower for management, 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.
Since there is no problem of fire or deterioration of the working environment due to evaporation of organic components, it can be said that this is a preferable washing method from the viewpoint of maintaining the washing work environment. However, this method is a method of washing with a washing solution in which water forms a continuous phase, so unlike a washing mechanism that dissolves and removes organic dirt, the surfactant in the water adheres to the part or on it. It mainly absorbs organic dirt, lowers their interfacial tension, promotes self-aggregation of organic dirt, and mainly removes them by rolling up. Therefore, the detergency against fluxes and waxes, which are viscous grease and solid dirt,
It is remarkably inferior to a cleaning agent that is washed by dissolution such as fog.

[0007] For this reason, excellent cleaning properties against organic stains of various physical properties such as a cleaning agent by a dissolution mechanism exemplified in the above, and non-flammability, low evaporation property and the like of the water-dilutable cleaning agent exemplified in the above. It has been desired to develop a cleaning agent and a cleaning method having both functions of cleaning work safety.

Under such circumstances, the present applicant uses a cleaning agent characterized by phase separation or an aqueous solution of the cleaning agent, and in a cleaning tank of a cleaning machine, an upper layer of the liquid contains an organic matter content derived from the cleaning agent. Has less aqueous phase than the lower part of the liquid,
A step of forming an oil phase in which the organic matter content derived from the detergent is higher in the lower layer of the liquid than in the upper layer of the liquid, and washing the object to be cleaned so as to come into contact with the oil phase; and A cleaning method characterized by comprising a step of rinsing an object to be cleaned while spraying or spraying water from a liquid injection port provided, and a cleaning composition used for the method, have already been filed (Japanese Patent Application No. Hei 10-284,1992). No. 6-74254). However, although the detergent composition used here is preferably a compound essentially containing no halogen atom, it is difficult to increase the specific gravity, so that it takes time to separate the water phase and the oil phase. There was room for improvement in these respects.

[0009] Accordingly, an object of the present invention is to provide, in particular, by using the above-mentioned cleaning method, excellent cleaning properties against organic stains of various physical properties and excellent cleaning work safety such as nonflammability and low evaporation property. An object of the present invention is to provide a cleaning composition and a cleaning method capable of ensuring the property.

[0010]

Means for Solving the Problems In view of such circumstances, the present inventors have conducted intensive studies and as a result, in the above-mentioned 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, it has been found that the above object can be achieved by appropriately adjusting the phase separation performance, and the present invention has been completed.

That is, the gist of the present invention is as follows: (1) A compound having a halogen atom directly bonded to a carbon atom
Organic compounds with a temperature of 150 ° C or higher at 1 atm
Using a cleaning agent or an aqueous solution of the cleaning agent
In the washing tank of the washing machine, an aqueous phase in which the content of the organic matter derived from the detergent is lower than the lower part of the liquid in the upper part of the liquid,
A washing method characterized by forming an oil phase in which the content of the organic substance derived from the detergent in the lower layer of the liquid is higher than that of the upper layer of the liquid, and washing the object to be cleaned in contact with the oil phase; (2) Detergent or aqueous solution of the detergent for 20 to 10
When left at a temperature of 0 ° C. for 30 minutes, 5
0% by weight or more forms an oil phase and separates from the aqueous phase
( 3) The washing method according to (1), (3) 50% by weight or more and 99% by weight of the contained organic matter.
The following (2), wherein the following forms an oil phase and separates from the aqueous phase:
The method of cleaning, (4) 80 wt% to 99 wt% of the organic material contained
The following (2), wherein the following forms an oil phase and separates from the aqueous phase:
The method of cleaning, (5) halogen bonded directly to carbon atoms in the detergent component
Organic compounds having a boiling point of 150 ° C or more at 1 atm.
Contains a compound as an essential component, its cleaning agent or its
Leave the aqueous solution of the detergent at a temperature of 20-100 ° C for 30 minutes.
When the organic matter content derived from the detergent is
Part of the aqueous phase, the organic layer derived from the detergent
Phase so that the oil content is higher than that of the upper layer.
The cleaning method according to any one of (1) to (4) above,
Detergent composition characterized in that it is used in an aqueous solution of (6) detergent, or the cleaning agent 1:20
When left at a temperature of 00 ° C. for 30 minutes,
50% by weight or more forms an oil phase and separates from an aqueous phase, and
The specific gravity of the oil phase is greater than the specific gravity of the aqueous phase,
Forming an aqueous phase and an oil phase in a lower layer.
(5) The cleaning composition according to (5), (7) 50% by weight or more and 99% by weight of the contained organic matter
The following (6), wherein the following forms an oil phase and separates from the aqueous phase:
Of detergent composition, (8) 80 wt% to 99 wt% of the organic material contained
The following (6), wherein the following forms an oil phase and separates from the aqueous phase:
Detergent composition, bonded directly to a carbon atom in the organic component of (9) detergent
Contains 30% by weight or more of an organic compound having a halogen atom
The detergent composition according to any one of (5) to (8), (10) an average HLB of 7 to 15 in an organic component of the detergent.
Containing 0.1 to 30% by weight of a nonionic surfactant
(5) The cleaning composition according to any one of (9) to (9) .

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

In the cleaning composition of the present invention, when the cleaning agent or the aqueous solution of the cleaning agent is allowed to stand, the contained organic matter forms an oil phase and separates from the aqueous phase, and the specific gravity of the oil phase is increased. It is necessary to contain an organic substance having a specific gravity higher than the specific gravity of the aqueous phase and having the property of forming an aqueous phase in the upper layer and an oil phase in the lower layer.

Examples of the organic substance having such characteristics include an organic compound containing a halogen atom such as fluorine, chlorine, bromine or iodine in the molecule. By including halogen atoms as constituent elements in organic molecules in this way, the specific gravity of the organic molecules is increased, the cleaning ability against organic dirt is increased, and depending on the content, the flame retardancy of the cleaning agent alone is also increased. Can be granted. In order to be used as a detergent, it is desirable that halogen atoms are hardly eliminated from organic molecules by a decomposition reaction or the like even under severe washing conditions and exist in a more stable bonding state. Must be directly bonded to a carbon atom. Thereby, chemical stability under various washing conditions can be ensured.

Examples of these organic compounds include chain hydrocarbons, aromatic or alicyclic hydrocarbons, hydrocarbons including aromatic or alicyclic hydrocarbons, alcohols, fatty acids and amines derived therefrom, Some or all of the hydrogen atoms bonded to carbon atoms, such as ethers, esters, ketones and amides which are the reactants between them, and alkylene oxide adducts such as ethylene oxide and propylene oxide of alcohols, fatty acids and amines, are halogenated. Compounds substituted with an atom are exemplified.

Part or all of the hydrogen atoms bonded to carbon atoms of hydrocarbons, including chain hydrocarbons, aromatic or alicyclic hydrocarbons, and aromatic or alicyclic hydrocarbons, are substituted with halogen atoms. Specific examples of the compound include chlorocyclohexane, dichlorobenzyl, dichloroxylene, chlorotoluene, chlorinated naphthalene, bromobenzene, dibromobenzene, trichlorobenzene, fluorostyrene, fluorotoluene, 1,5-dichloropentane, and 1,4-dichloropentane. Dibromobutane, octyl bromide and the like.

Alcohols and fatty acids derived from chain hydrocarbons, aromatic or alicyclic hydrocarbons, and hydrocarbons including aromatic or alicyclic hydrocarbons, and ethers and esters which are reactants thereof Examples of ketones include chlorobenzyl alcohol, 2,3-dibromo-1-propanol, fluorophenol, chlorophenol, dichlorophenol, p-chloroacetophenone, methyl o-bromobenzoate, ethyl 2-bromoisobutyrate, decaethyl Bromodiphenyl ether, α-bromobutyric acid and the like can be mentioned.

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

Among them, R ₁ X (AO) _n YR
Compounds represented by ₂ are preferred, and detergents containing 30% by weight or more of them in the detergent composition are preferred. 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; an ether group, an ester group, or an amino group; Wherein (AO) is an alkylene oxide having 2 to 4 carbon atoms, and n is a value of 1 to 20 as an average addition mole number of (AO). The above halogen atom-containing compounds are used alone or in combination of two or more.

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

In order for the cleaning agent of the present invention to sufficiently retain the properties of the halogen-containing organic compound, that is, the properties such as a large specific gravity, excellent cleaning properties, and flame retardancy, 30% by weight in organic components of detergent
The above is preferably the above-mentioned organic compound containing a halogen atom, more preferably 50 to 100% by weight.

The detergent used in the present invention or its aqueous solution needs to be phase-separated to form an aqueous phase in the upper layer and an oil phase in the lower layer. In order to efficiently obtain a two-liquid layer in a short time, when the detergent or the detergent 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 preferable to separate from the aqueous phase to form an oil phase under the aqueous phase, and more preferably, a detergent capable of separating 80% by weight or more of organic substances from the aqueous phase. The larger the separation rate of organic matter, the smaller the amount of organic matter remaining in the aqueous phase, which is preferable because it can reduce environmental deterioration factors such as fire and odor.
Further, considering the rinsing properties 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, particularly preferably 99% by weight or less.

In order to improve the durability of the cleaning agent against stains or the rinsing property when rinsing with water, the organic components of the cleaning agent include, in addition to the aforementioned halogen atom-containing compounds,
0.1 to 3 nonionic surfactants having an average HLB of 7 to 15
When 0% by weight is included, more preferable detergency can be obtained,
More preferably, it is 1 to 15% by weight.

The nonionic surfactants used include:
For example, an ether type such as an alkyl ether type or an alkyl allyl ether type; an alkyl ester type; a condensation type with an amine such as a polyoxyalkylene alkylamine; a condensation type with an amide such as a polyoxyalkylene alkyl amide;
Pluronic or tetronic type obtained by random or block condensation of polyoxyethylene and polyoxypropylene; surfactants such as polyethyleneimine.

In the present invention, the organic substance is referred to as TOC (Total).
Organic Carbon (total organic carbon) value. This TOC value is basically JIS-
It is measured by the combustion-infrared analysis method described in “Organic Carbon (TOC)” in K0102 “Factory Wastewater Test Method”, and is, for example, TOC-500 manufactured by Shimadzu Corporation.
Can be measured. In addition, the separation rate of organic substances in the cleaning solution or the cleaning solution as an aqueous solution of the cleaning solution is obtained by dividing the TOC value of the cleaning solution in the lower layer of the cleaning solution 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. , And a value obtained by multiplying the value by 100 is represented by%.

The detergent used in the present invention includes an organic or inorganic chelating agent as long as the effects of the present invention are not lost.
Builders, silicone oil-based defoamers, amine-based rust inhibitors, alkanolamines such as diethanolamine and methyldiethanolamine, alcohols, and petroleum solvents may be appropriately blended. The cleaning composition of the present invention is used for cleaning alone or as an aqueous solution thereof,
When used alone, the detergent composition contains water in advance, and when used as an aqueous solution, it contains no water or contains a relatively small amount of water.

In the cleaning method of the present invention, the above-described cleaning composition is used, and in the cleaning tank of the cleaning machine, an aqueous phase in which the content of organic substances derived from the cleaning agent is lower than that of the lower phase in the upper layer of the liquid. An oil phase in which the content of organic substances derived from the detergent is higher in the lower layer than in the upper phase is formed, and the object to be cleaned is washed so as to come into contact with the oil phase. When cleaning the machine to be cleaned and precision parts, the cleaning liquid of the cleaning agent of the present invention or an aqueous solution of the cleaning agent is used as the upper layer of the aqueous phase containing a small amount of organic substances derived from the cleaning agent, and the cleaning agent concentrated liquid. This is carried out by immersing the machine and precision parts in a liquid having a certain oil phase as a lower layer for a certain period of time. At this time, in order to obtain sufficient cleaning properties, it is better that the entire machine or precision part to be cleaned is in contact with the lower oil phase, and if it can be sufficiently immersed in the oil layer, it will obtain better cleaning properties. Can be.
The oil phase may be continuous or oil-drop-shaped, but it is more preferable to wash in a state containing the continuous oil phase from the viewpoint of cleanability and also from the viewpoint of maintaining the cleaning work environment.

FIG. 1 shows an example of a schematic configuration diagram of a cleaning tank of a cleaning machine used in the cleaning method of the present invention. The cleaning agent or a cleaning solution as an aqueous solution of the cleaning agent is irradiated with ultrasonic waves, agitated or jetted in the liquid. If the cleaning is performed by applying the mechanical force or physical force described above, better cleaning properties can be obtained. FIG. 1 shows an example in which a water phase and an oil phase are respectively circulated by a pump to stir each phase. It is preferable to add the mechanical force and the like within a range in which the lower oil phase does not appear on the surface of the upper layer, which is the aqueous phase, because it has less odor and the like and is suitable for maintaining the washing work environment.

The depth of the oil phase in the washing tank is preferably set to be greater than the depth at which the entire machine and precision parts can be immersed from the viewpoint of washing efficiency. The depth of the aqueous phase should be greater than the oil phase surface from the viewpoint of maintaining the washing work environment, but when rinsing with the aqueous phase, the entire machine and precision parts can be almost immersed. It is more preferable to secure the depth of the sheet. It is preferable that the oily dirt and solid dirt mixed in the aqueous phase be used while being removed while being removed by various kinds of removing devices such as a filter and an oil-water separator installed in the circulation system, since better cleaning properties can be maintained.

In order to rinse the machine and precision parts to be cleaned, one or more, usually 1 to 20, liquid injection ports (nozzles) are provided above the aqueous phase surface in the cleaning tank, and then rinsed therefrom. When rinsing machines and precision parts while spraying or spraying water, rinsing can be sufficiently performed even when the depth of the aqueous phase is shallow, and as a result, the entire cleaning device can be made smaller and more compact. The rinse water used here may be any of pure water, city water, circulating water of an aqueous phase as shown in FIG. 1, water obtained by regenerating the aqueous phase by activated carbon or an oil-water separator such as membrane separation, or vaporization. Good. If necessary, the lower oil layer can be injected from this nozzle while circulating by a pump.

One of these washing tanks may be used, or a plurality of washing tanks of the same washing method may be used side by side. If necessary, these washing tanks may be used in combination with a known washing method generally used in the prior art. May be. In addition, the object to be cleaned may be continuously washed while being conveyed by a belt conveyor or the like, and may be washed in an in-line system, a barrel system may be used, or any known cleaning system can be applied.

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. Particularly, it has a particularly excellent effect when cleaning machine parts, electric parts, precision parts and jigs and the like used in the assembling process.
Here, the precision parts refer to, for example, electronic parts, electric parts, precision machine parts, resin processed parts, optical parts and the like. Electronic components include, for example, printed wiring boards used in computers and their peripheral devices, home appliances, communication devices, OA devices, and other electronic devices; used in contact members such as IC lead frames, resistors, capacitors, and relays. Hoop material;
Liquid crystal display used for OA equipment, clocks, computer equipment, toys, home appliances, etc .; Magnetic recording parts used for video / audio recording / reproducing components, related components; Semiconductor materials such as silicon and ceramic wafers; Quartz Electrostrictive components such as vibrators; photoelectric exchange components used in CDs, PDs, copying machines, optical recording devices, and the like. Electromagnetic components include, for example, motor components such as brushes, rotors, stators, and housings; ticketing components used in vending machines and various devices; and currency inspection components used in vending machines, cash dispensers, and the like. Precision equipment parts include, for example, bearings used in precision drive equipment, video recorders, and the like; machining parts such as carbide chips, and the like. The resin processed parts refer to precision resin processed parts used for cameras, automobiles, and the like, for example. Further, the optical component refers to, for example, a lens used for a camera, eyeglasses, an optical device, and the like, and the other component includes, for example, an eyeglass frame, a watch case, a watch belt, and the like. Equipment parts include gears, camshaft springs, shafts, used in automobile engines and drive units.
Refers to bearings. The electric parts include motors such as video, plastic products, electron guns, shadow masks, and the like. In addition, jigs and tools used in the assembly processing process are used to manufacture precision parts as shown in the various parts examples above,
It refers to jigs and tools handled in various processes such as molding, processing, assembly, and finishing, as well as various devices and components for handling these precision components.

The cleaning composition and the cleaning method of the present invention exhibit a suitable performance when cleaning liquid crystal and the like adhering to a printed wiring board or a glass substrate in which flux remains. Machines and precision parts to be cleaned are not limited to these examples, but various kinds of interfering substances such as various processing oils and fluxes in the post-process such as flux in the assembling process, or various characteristics that degrade the characteristics of products The machine composition and the cleaning method of the present invention can be used for machines and precision parts having a fixed solid surface to which oily contaminants are adhered. These contaminants include, for example, fats and oils, machine oils, quenching oils, cutting oils,
When the stain is mainly organic oil, such as grease, liquid crystal, or rosin flux wax, the characteristics of the cleaning composition and the cleaning method of the present invention are particularly exhibited. further,
Dirt mixed with metal powder, inorganic powder and the like is removed together with the removal of the organic oil, so that it can be cleaned well.

[0034]

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 Detergent compositions having the compositions shown in Table 1 were prepared, and diluted with ion-exchanged water so that the organic matter content became 50% by weight. 7 liters of the aqueous solution of the agent was put into a washing machine (washing tank shown in FIG. 1) equipped with an ultrasonic oscillator having a capacity of 10 liters and a stirrer, and allowed to stand at 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 organic content of the cleaning liquid was measured from the TOC value (TOC-500, manufactured by Shimadzu Corporation). Was calculated. Table 1 shows the results.

[0037]

[Table 1]

At this time, in Examples 1-5, at 70 ° C., 50% by weight or more of the contained organic matter was separated from the aqueous solution, the upper layer was an aqueous phase, and the lower layer was an oil which was a concentrated solution of a detergent. The formation of a phase was confirmed. Moreover, 20-100 degreeC
When the separation was observed in the same manner while changing the temperature in Example 1, good separation properties were shown at a temperature of 40 ° C. or more in Example 1 and 20 ° C. or more in the other examples. Along with the above, the odor derived from the cleaning agent generated from the cleaning liquid was significantly reduced after the separation as compared with before the separation. On the other hand, in Comparative Examples 1 and 2, 50% by weight or more of the organic matter was separated from the aqueous solution at a certain temperature or higher between 20 and 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: naphthenic mineral oil (40 ° C., 350
cst) (10 g / m ² ) applied to a steel test piece (10 cm × 15 cm) or test material 2: grease applied (5 g / m ² ) steel test piece (10 cm × 1)
5 cm) was washed while the test piece was completely in contact with the oil phase. Washing is performed at a washing temperature of 50 ° C. while applying ultrasonic waves for 0.5 minutes. After washing, the test piece is moved to the aqueous phase, ultrasonically rinsed for 0.5 minutes, taken out of the washing tank, and then washed at 80 ° C. for 15 minutes. Dried for minutes. The cleanability of the test piece after cleaning is expressed as (weight of test piece before cleaning-
The value of the test piece after cleaning) ÷ (the weight of the test piece before cleaning−the weight of the test piece itself) is 100.
, And the value is 90 or more in 以上, 75 to 89 in ○, 60
７４ = ７４, and less than 60 ×. 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, when the test piece was pulled out of the cleaning solution, a large amount of the oil phase on the surface layer was not removed because it was attached. Sufficient detergency was not obtained.

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

Next, the washing liquid obtained in Example 1 was washed with the same test piece and washing method as described above while stirring the washing liquid with a stirring device so that the whole washing liquid became uniform (Comparative Example 3). As a result, as shown in Table 1, Comparative Example 3
Although the same detergent was used as in Example 1, the detergency was reduced.

[0042]

According to the present invention, it is possible to prevent the danger of fire and explosion due to ignition and the deterioration of the working environment such as odor due to the volatilization of organic substances, and it is possible to wash with a concentrated solution of a cleaning agent forming an oil phase in the lower layer. Therefore, high cleaning properties can be ensured for various types of organic stains that are liquid or solid. As a result, a good cleaning effect can be exerted on inorganic dirt such as abrasion powder mixed with organic dirt.

[Brief description of the drawings]

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

[Explanation of symbols]

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

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-166692 (JP, A) JP-A-5-185045 (JP, A) JP-A-6-240299 (JP, A) JP-A 61-1986 296099 (JP, A) JP-A-57-101676 (JP, A) JP-A-48-47903 (JP, A) JP-A-4-45842 (JP, A)

Claims (10)

(57) [Claims] 1. A halogen atom directly bonded to a carbon atom
Organic compounds having a boiling point of 150 ° C. or more at 1 atm.
Cleaner containing essential components or its aqueous solution
In the washing tank of the washing machine, the 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 in the upper layer of the liquid, and the content of the organic substance derived from the detergent in the lower layer of the liquid. Is formed by forming an oil phase more than the upper layer of the liquid, and washing the object to be cleaned so as to come into contact with the oil phase. 2. A cleaning agent or an aqueous solution of the cleaning agent,
Organics contained when left at a temperature of ~ 100 ° C for 30 minutes
50% by weight or more of the product forms an oil phase and separates from the aqueous phase
The cleaning method according to claim 1. 3. An organic substance contained in an amount of 50% by weight or more and 99% or more.
3. A method according to claim 2, wherein less than% by weight forms an oil phase and separates from the aqueous phase.
The cleaning method as described. 4. An organic substance contained in an amount of 80% by weight or more and 99% or more.
3. A method according to claim 2, wherein less than% by weight forms an oil phase and separates from the aqueous phase.
The cleaning method as described. 5. A detergent component directly bonded to a carbon atom.
Has a halogen atom and a boiling point of 150 ° C or more at 1 atm.
Organic compound as an essential component, and its cleaning agent or
For 30 minutes at a temperature of 20-100 ° C
When left at rest, the organic matter content from the detergent in the upper layer of the liquid
Contains less aqueous phase than the lower layer
To form an oil phase with higher organic matter content than the upper layer
The cleaning method according to any one of claims 1 to 4, wherein the phase is separated.
A cleaning composition characterized by being used for: 6. A cleaning agent or an aqueous solution of the cleaning agent,
When left at a temperature of 0 to 100 ° C for 30 minutes,
More than 50% by weight of the equipment forms an oil phase and separates from the water phase
And the specific gravity of the oil phase is greater than the specific gravity of the aqueous phase,
Therefore, it is characterized by forming an aqueous phase in the upper layer and an oil phase in the lower layer
The cleaning composition according to claim 5. 7. An organic substance contained in an amount of 50% by weight or more and 99% or more.
7. A method according to claim 6, wherein less than% by weight forms an oil phase and separates from the aqueous phase.
The cleaning composition according to the above. 8. An organic substance contained in an amount of 80% by weight or more and 99% or more.
7. A method according to claim 6, wherein less than% by weight forms an oil phase and separates from the aqueous phase.
The cleaning composition according to the above. 9. The method according to claim 9 , wherein the organic components of the cleaning agent are directly bonded to carbon atoms.
30% by weight or less of the organic compound having a combined halogen atom
The cleaning composition according to any one of claims 5 to 8, which comprises the above. 10. The composition according to claim 1 , wherein an average HLB of 7 is contained in an organic component of the detergent.
0.1 to 15% by weight of nonionic surfactant
The cleaning composition according to any one of claims 5 to 9.