JPH09132800A - Cleaner composition and cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cleaner composition capable of removing the oxidized coating films on powder, abrasive grain and metals in a similar way to the case using alkaline cleaners, also excellent in detergency involving dissolving power, degreasing power and infiltrative power etc., thus applicable even to such fields as to require precision cleaning, and to provide a cleaning method capable of sufficiently exerting the detergency of this cleaner. SOLUTION: This water-based cleaner composition contains (A) an inorganic phosphoric acid compound and (B) an amine compound. The cleaning method has such a scheme that a stained object to be cleaned is put into a vertical cylinder 7 free from any penetrating hole on the cylindrical portion and provided with penetrating holes at the bottom only, which is installed freely insertibly inside a cleaning tower 4 incorporated in a cleaner circulating line into which the cleaner is forcedly circulated to remove stains from the object to be cleaned.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cleaning composition and a cleaning method. Specifically, the cleaning composition of the present invention can be used as a cleaning agent for various industrial materials and electronic materials made of various metals, glass, plastics, ceramics, etc., and the cleaning composition of the present invention can be used as a cleaning agent of the present invention. When combined with the method, it can be effectively used for cleaning industrial materials and electronic materials.

[0002]

2. Description of the Related Art Conventionally, as a cleaning agent for industrial materials, a halogenated hydrocarbon cleaning agent such as trichloroethylene or trichlorotrifluoroethane has been used as a cleaning agent having a relatively simple shape or a complicated shape having a bag hole. It has been used in a wide range of fields from washing of articles (for example, vacuum system parts and the like) to washing of precision parts (for example, PGA, BGA and the like) requiring high cleanliness. However, halogenated hydrocarbon solvent-based detergents have excellent cleaning power relating to dissolving power, degreasing power, penetrating power, and the like, and also have the advantage of being nonflammable and excellent in drying property, but recent groundwater pollution, Air pollution,
It cannot be used because of environmental pollution such as ozone layer depletion and toxicity. Under these circumstances, hydrocarbon solvent-based cleaning agents and conventionally used alkaline cleaning agents have recently been used as non-halogen based cleaning agents.

The above-mentioned hydrocarbon solvent type cleaning agent is composed of an organic solvent such as normal paraffin type, isoparaffin type, naphthene type, alkylbenzene type, etc., alone or in combination, and has a degreasing power, a detergency related to a penetrating power and the like. And is excellent in that it has an appropriate drying property. However, hydrocarbon solvent-based detergents have problems in flammability, odor and toxicity. Further, in the hydrocarbon solvent-based cleaning agent consisting only of the organic solvent, the powder used for the surface processing of the industrial material, the abrasive grains, and the oxidation generated on the metal surface when the metal is used for the industrial material. It is difficult to remove the coating film.

On the other hand, the alkaline cleaner is an aqueous solution of an alkali hydroxide such as sodium hydroxide or potassium hydroxide, an alkali metal salt such as sodium carbonate, sodium silicate, sodium borate or sodium phosphate, or an aqueous solution thereof. Nonionic surfactants typified by polyoxyethylene alkyl ethers and anionic surfactants typified by sodium alkylbenzene sulfonate, E
A chelating agent such as DTA or gluconic acid, an amine, and an anticorrosive agent such as sodium nitrite are appropriately blended, and various blending compositions have been proposed depending on the properties and stains of the object to be cleaned. Such an alkaline cleaner is not only excellent in degreasing and cleaning, but also can effectively remove powders, abrasive grains, oxide films of metals and the like. However, since the cleaning power of the alkaline cleaner is inferior to that of the halogenated hydrocarbon solvent-based cleaner, it is not applicable to the field requiring a precise cleanliness. Further, in order to improve the detergency of the alkaline cleaner, it is conceivable to increase the amount of the alkali metal salt in the alkaline cleaner or to add an organic solvent or a nonionic surfactant. When applied to precision cleaning, the rinsability becomes poor and it becomes difficult to completely remove the cleaning agent in the end. Further, it is not preferable in that the load on the wastewater treatment becomes large, the toxicity and flammability are problematic when an organic solvent is used, and the stability of the product is improved. In addition, when aluminum or the like is used as the industrial material, the amount of the alkali metal salt cannot be increased in some cases because the industrial material tends to be discolored.
Therefore, in practice, the fields in which the alkaline cleaning agent can be used were limited to the fields in which the amount of residual oil after cleaning need not be considered so much and the fields in which the object to be cleaned is not affected by the alkaline cleaning agent. .

[0005]

DISCLOSURE OF THE INVENTION The present invention is capable of removing powders, abrasive grains, oxide coatings of metals, etc., as well as alkaline cleaners, and is capable of dissolving, degreasing, penetrating and so on. It is an object of the present invention to provide a cleaning agent which is excellent in strength and can be applied even in a field where precision cleaning is required, and a cleaning method capable of sufficiently exerting the cleaning ability of the cleaning agent.

[0006]

As a result of intensive studies conducted by the present inventors in order to achieve the above-mentioned object, the following cleaning composition having a specific composition meets the object of the present invention, and the cleaning of the present invention is also performed. It was found that the above-mentioned problems can be solved by washing the object to be washed with the agent composition by the following specific washing method. The present invention has been completed based on this new finding.

That is, according to the present invention, an aqueous detergent composition containing (A) an inorganic phosphoric acid and (B) an amine, and a washing tower incorporated in a detergent circulation line are inserted into the washing tower. In the vertical container for storing the object to be cleaned, which is installed and installed in a state where there is no liquid passage hole in the body and only liquid passage hole in the bottom, The present invention relates to a cleaning method comprising forcibly circulating the cleaning composition to clean and remove dirt from the object to be cleaned.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The detergent composition of the present invention comprises (A) an inorganic phosphoric acid and (B) an amine as described above, and has the (A) inorganic phosphoric acid having a dissolving power and a dispersing power. , Buffering power, sequestering power, etc., and (B) amines have the same corrosion prevention power, saponification power, etc., and (A) inorganic phosphates and (B) amines are mixed in various ratios. Is a cleaning composition whose pH can be appropriately determined according to the object to be cleaned.

Examples of the inorganic phosphoric acid (A) include orthophosphoric acid, metaphosphoric acid, phosphorous acid, condensed phosphoric acid such as pyrophosphoric acid, tripolyphosphoric acid and hexametaphosphoric acid. Further, in the present invention, as (A) the inorganic phosphoric acid, a part of the inorganic phosphoric acid is replaced with an alkali metal salt such as sodium salt, potassium salt, or ammonium salt, for example, sodium monohydrogen phosphate, dihydrogen phosphate. Sodium or the like can also be used. However, the inorganic phosphoric acid (A) does not include those completely substituted with an alkali metal salt or the like. This is because in the completely neutralized inorganic phosphoric acid, the inorganic phosphoric acid cannot be replaced with the amine (B), and therefore the pH of the resulting detergent composition cannot be adjusted appropriately.

The (B) amines include primary amines,
Both secondary amines and tertiary amines can be used. Specific examples thereof include alkylamines such as diethylamine, triethylamine and cyclohexylamine, ethylene oxide adducts of alkylamine, alkanolamines such as diethanolamine, triethanolamine and alkylethanolamine. Among these amines, alkanolamines are particularly preferable from the viewpoints of detergency, safety and odor.

The detergent composition of the present invention containing the (A) inorganic phosphoric acid and the (B) amine is used in the form of an aqueous solution. The amounts of the inorganic phosphates (A) and the amines (B) used are not particularly limited and are appropriately determined depending on the conditions such as the shape and properties of the object to be cleaned, the type of stain component, the cleaning method and the like.
Usually, the total amount of (A) inorganic phosphoric acids and (B) organic amines in the detergent composition is 0.01 to 20% by weight.
The amount is preferably about 0.1 to 5% by weight. If the content of the active ingredients (A) and (B) in the cleaning composition is less than 0.01% by weight, the cleaning effect is not sufficient. On the other hand, if it exceeds 20% by weight, the load in the rinsing step after cleaning becomes large and the cleaning efficiency is poor.

The mixing ratio of (A) inorganic phosphoric acid and (B) amine is not particularly limited, but a detergent composition having a pH suitable for the object to be cleaned is prepared. Normal,
The detergent composition is prepared so as to have a pH of 4 to 10. For example, if the object to be cleaned is an iron-based industrial material, etc., prepare a cleaning agent composition on the alkaline side, and if the object to be cleaned is a copper-based or aluminum-based industrial material, etc., wash it on the acidic side. It is preferable to prepare an agent composition. Further, in the case of simultaneously cleaning a copper-based or aluminum-based industrial material or the like and an iron-based industrial material or the like, it is preferable to prepare the detergent composition having a pH of 7 to 9 in a neutral to weakly alkaline manner. In the case of preparing the detergent composition on the alkaline side, the use ratio (equivalent ratio) of the (B) amines may be increased as compared with the (A) inorganic phosphoric acids, and in the case of preparing on the acidic side. Is
The use ratio (equivalent ratio) of (B) amines may be reduced as compared with (A) inorganic phosphoric acids. In addition, in the case of adjusting to neutral to weakly alkaline, (A) inorganic phosphates and (B) amines may be equivalent to each other.

Further, the detergent composition of the present invention may be blended with a glycol ether compound or a nonionic surfactant depending on the degree of stains on the article to be cleaned, properties, adhesion conditions and the like. . The blending amount of the glycol ether compound or the nonionic surfactant is about 10% by weight or less in the detergent composition.

Specific examples of glycol ether compounds include, for example, diethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether, diethylene glycol dipropyl ether. Ether, diethylene glycol methyl propyl ether, diethylene glycol ethyl propyl ether, diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, diethylene glycol methyl butyl ether, diethylene glycol ethyl butyl ether, diethylene glycol B pills ether, diethylene glycol monobutyl ether acetate, diethylene glycol pentyl ether, diethylene glycol dipentyl ether, diethylene glycol methyl pentyl ether, diethylene glycol ethyl pentyl ether, diethylene glycol propyl pentyl ether, diethylene glycol butyl pentyl ether;
Examples thereof include trees corresponding to these, or tetraethylene glycols; and corresponding di, tree, or tetrapropylene glycols. These glycol ether compounds can be used alone or in appropriate combination of two or more kinds.

Further, specific examples of the nonionic surfactant include polyalkylene glycols such as polyoxyalkylene alkyl (alkyl group having 6 or more carbon atoms) ether, polyoxyalkylene phenol ether, polyoxyalkylene alkylphenol ether and the like. Ether-type nonionic surfactants; polyalkylene glycol monoester-type nonionic surfactants; alkylene oxide adducts of fatty acid amides; sorbitan fatty acid esters; polyhydric alcohol-type nonionic surfactants such as sucrose fatty acid esters Fatty acid alkanolamides, polyoxyalkylene alkylamines and the like can be mentioned. These nonionic surfactants may be used alone or in combination with 2
It is also possible to properly select and combine two or more species. The alkylene refers to ethylene, propylene and butylene, and the polyoxyalkylene refers to polyoxyethylene, polyoxypropylene, polyoxybutylene and copolymers of these.

Further, additives such as triazoles and nitrites can be appropriately added to the detergent composition of the present invention, if necessary. The amount used is about 1% by weight or less.

The cleaning composition of the present invention can be applied to various cleaning methods and can be used for cleaning in various cleaning steps (in addition to various industrial materials already exemplified, for example, chip capacitors to which oxide fine particles are attached). , A heat sink to which oils and fats are attached, a ball bearing to which oils and fats and fine powders are attached, etc.) can be contacted to remove dirt from the object to be cleaned. Further, after the cleaning step, rinsing with water is performed once or twice or more depending on the required cleanliness of the object to be cleaned,
Finally dry. The temperature at the time of using the detergent composition or the rinsing agent in such a washing step or rinsing step is generally about 10 to 90 ° C. It is preferably about 50 to 70 ° C.

As a method for bringing the cleaning composition of the present invention into contact with the object to be cleaned, known means can be adopted. Specifically, a method of directly immersing an object to be cleaned in a detergent composition for cleaning, a method of jet spraying the detergent composition in a liquid,
Examples thereof include a method of immersing the cleaning composition in ultrasonic waves, a method of spraying the cleaning composition in the air, and a method of brushing by a mechanical means.

As a method for bringing the cleaning composition of the present invention into contact with an object to be cleaned, known means can be adopted as described above, but the cleaning power of the cleaning composition of the present invention can be particularly exerted as follows. It is the direct-through type cleaning method shown. According to such a direct cleaning method, the cleaning ability can be dramatically improved, and a large amount of the object to be cleaned can be precisely cleaned in a short time. Further, the direct-through type cleaning method is a cleaning method which can be effectively applied to any industrial material such as small articles, articles having complicated shapes, and precision parts.

In other words, the direct-through type cleaning method is a cleaning tower that is housed and installed in a cleaning tower incorporated in a circulation line of a cleaning agent in a loosely inserted state, and has a body-portion liquid-passing hole and a bottom-portion liquid-passing hole only. A method for cleaning and removing dirt from an article to be cleaned by forcibly circulating the detergent composition of the present invention in the container after the article to be cleaned with dirt is stored in a vertical container for articles. .

The direct cleaning method will be described below with reference to the accompanying drawings.

As is apparent from the overall flow diagram schematically shown in FIG. 1, the cleaning apparatus used in the cleaning method of the present invention is the cleaning agent 2 (the cleaning agent composition of the present invention stored in the liquid tank 1). A liquid circulation line 3 for circulating the product) between the liquid outlet 1a and the liquid return port 1b, and a washing tower 4 in the middle of the line 3.
And a liquid feed pump 5 for forced liquid circulation,
Further, in order to enable the liquid draining and the drying after the cleaning of the object to be cleaned a, a wind or hot air supply line 11 branched from the middle of the outward path 3a of the liquid circulation line 3,
The blower 13 and the heater 1 are connected to the exhaust line 12 branched from the middle of the return path 3b, and further to the wind or hot air supply line 11.
4 is provided.

In the liquid circulation line 3, the outward path 3a is connected to the upper chamber 4a of the washing tower 4 with the liquid outlet 1a as a starting point, and the return path 3b is started with the upper end of the lower chamber 4b as a starting point. Connected to. On the other hand, only the blower 13 is used when the liquid is drained after the cleaning, and the blower 13 and the heater 14 are used when the drying is performed. The blower 13 may be provided in the line 11 before the heater 14 as shown in FIG. 1, or may be provided after the line 12 or the gas-liquid separator 15.

Note that valves V _{1 to} V ₄ are provided in the reciprocating paths 3a and 3b between the lines 11 and 12 and the liquid circulation line 3, and the liquid circulation line and drying are performed by opening and closing these valves V _{1 to} V _4. Switch to the line.

In the illustrated example, the cleaning tower 4 is installed above the liquid tank 1 in order to return the cleaning residual liquid in the tower 4 into the liquid tank 1 through the return line 6 by utilizing the head difference. However, if it is returned using a pump, it is not necessary to install it above. Valve V ₅ is provided in the return line 6.

Further, in the cleaning tower 4 of the cleaning apparatus used in the cleaning method of the present invention, in order to accommodate the object to be cleaned a, there is no body part through hole and only the bottom part has a through hole. A vertical container 7 for storing the wash items is stored and installed in a loosely inserted state.

As shown in detail in FIGS. 2 and 3, the vertical container 7 is of a bottomed cylinder type, and the bottom portion 7a is made of a perforated member such as punching metal or wire mesh, and thus is arranged in the axial direction. Liquid can pass through, and the body portion 7b is made of a non-porous member so that the liquid does not flow out from the body portion 7b. The cross-sectional shape of the cylinder is not particularly limited and may be circular or polygonal, but generally the circular shape shown in FIG. 3 is preferable. Moreover, the inside of the vertical cylinder may be divided into a plurality of parts by a partition plate or the like.

The vertical container 7 is preferably as long as possible in order to accommodate a large number of objects to be cleaned a with a comparatively small cross-sectional area. Therefore, the ratio of the diameter to the height is set to the former 1 to the latter 1 to 10, preferably to the range of 2 to 5. The diameter of the vertical container 7 is not particularly limited and may be appropriately determined depending on the type of the article to be cleaned, but is usually about 1 cm to 1 m. Preferably 5c
m to 50 cm, more preferably 8 to 30 cm. Further, the number of the vertical container 7 inserted and installed in the washing tower 4 is arbitrary, and as shown in FIG.
There are cases where there are multiple as shown in.

In order to accommodate and install such a vertical container 7 in a loosely inserted and suspended state, the vertical container 7 is usually provided at the upper end with
A flange portion 8 is provided, and the flange portion 8 is suspended on an annular member 9 projecting inward from the upper end of the inner peripheral surface of the tower 4. The overlapping portion of the flange portion 8 and the annular member 9 forms a surface contact seal portion 10 without a gap over the entire range of 360 °, and the upper portion 4a and the lower portion of the cleaning tower 4 are separated from the seal portion 10 in the washing tower 4. 4b.

In cleaning the object a to be cleaned using such a cleaning device, first, in the state shown in FIG. 1, the liquid feed pump 5 is operated to circulate the cleaning agent 2 in the liquid tank 1. The cleaning agent 2 is forcedly circulated in the line 3 to enter the cleaning agent 2 from the outward path 3a into the vertical container 7 through the upper chamber 4a of the cleaning tower 4, and is forcedly circulated in the container 7 in the axial direction to clean the object to be cleaned a. Wash. The cleaning agent 2 which has been used for cleaning the object to be cleaned a in such cleaning
Enters the lower portion of the lower chamber 4a of the washing tower 4 from the lower end of the vertical container 7, further rises in the lower chamber 4a, returns to the liquid tank 1 via the return path 3b, and is circulated. Incidentally, this during the washing operation is valve V ₁ ~V ₂ open state, V ₃ ~V ₅ is held in the closed state.

In such a cleaning method of the present invention, the vertical container 7 is vertically long and has a relatively small cross-sectional area. In addition, since the body portion 7b has no liquid passage hole, liquid cannot be passed therethrough, and only the bottom portion 7a is liquid passed. Since the cleaning agent 2 has holes and passes from the upper end toward the lower end, the cleaning agent 2 contacts the object a to be cleaned a effectively at a relatively high flow rate, and cleaning can be efficiently performed. Even if the height of the articles to be cleaned a is relatively large, the total amount of the cleaning agent 2 passes through the vertical container 7, so the flow rate of the cleaning agent 2 in the vertical container 7 is It becomes almost constant from the upper end to the lower end, and the entire object to be cleaned a can be uniformly cleaned, so that a large number of objects to be cleaned a can be cleaned at one time.

Since the flow rate of the cleaning agent forcibly flowing through the vertical container 7 is almost constant from the upper end to the lower end, the cleaning efficiency can be improved by increasing the flow rate, but the cleaning time, the cleaning temperature, and the object to be cleaned can be improved. It may be appropriately adjusted depending on the type, the storage amount, the type of adhered dirt, and the like. Usually, the flow rate of the cleaning composition is preferably about 3 to 200 cm / s, and the cleaning time is about 30 seconds to 120 minutes.
Further, the cleaning temperature is about 10 to 90 ° C. as described above.
In order to shorten the drying time, it is desirable that the temperature is as high as possible within the usable temperature range.

When the bottom portion 7a and the body portion 7b of the vertical container 7 are provided with liquid passage holes, a part of the cleaning agent 2 passes through the body portion while the cleaning agent 2 is passing through the vertical container. Since it flows out of the container through the hole, the flow velocity of the cleaning agent 2 in the vertical container gradually decreases as it goes downward, and the average flow velocity in the vertical container is Although it depends on the opening / closing rate, it is considerably lower than that of the present invention. Further, since the cleaning agent 2 flowing out through the liquid passage hole in the body of the vertical cylinder does not come into contact with the object a again, the amount of the cleaning agent 2 in contact with the object a also decreases. As a result, the contact efficiency decreases as compared with the present invention in which the entire amount of the cleaning agent 2 comes into contact with the object to be cleaned a.

After the predetermined cleaning is completed, the operation of the pump 5 is stopped, the circulation of the cleaning agent 2 is stopped, and V ₁ and V ₂ are closed, while the valves V _{3 to} V ₅ are opened. Valve V ₃ ~V
By opening _5, the remaining washing liquid in the washing tower 4 and the vertical cylinder 7 is returned into the liquid tank 1 through the return line 6. On the other hand, the outside air is introduced into the vertical container 7 and the washing tower 4 through the lines 11 and 12 on the draining and drying side, and after collecting the remaining washing liquid, the valve 5 is closed.

Next, the blower 13 is operated to perform draining and drying by supplying air or hot air. At the time of drying, the outside air is heated by the heater 14, and the washing tower 4 is passed through the line 11.
The liquid is sent from the upper chamber 4a into the vertical container 7, and the object a to be cleaned a is drained and dried, and the attached cleaning agent is removed. Further, by providing a vacuum device after the exhaust line 12 or the gas-liquid separation device 15, the liquid removal and drying may be performed under reduced pressure.

The adhering liquid separated from the object to be cleaned a flows or drops and collects at the bottom of the lower chamber 4b of the cleaning tower 4, and the adhering liquid accumulated at the bottom is returned to the return line by opening and closing the valve V ₅ after the completion of the drying operation. It is returned to the liquid tank 1 through 6. On the other hand, the wind or hot air flows from the lower end of the vertical container 7 to the lower chamber 4b of the washing tower 4.
The cleaning agent 2 is discharged into the atmosphere through the exhaust line 12 while facing the upper portion of the lower chamber 4b while leaving the cleaning agent 2 at the bottom of the lower chamber 4b. Further, the gas-liquid separator 1 is connected to the exhaust line 12.
5, the separated liquid is passed through the return line 16 and the valve V ₆
It may be returned to the liquid tank 1 by opening and closing. further,
If necessary, the object a to be cleaned, which has been cleaned and removed, is rinsed and then dried. The rinse treatment agent may, for example, be water.

After draining and drying the object to be cleaned a, the operation of the blower 13 is stopped, and V ₃ and V ₄ are closed.

When a series of washing and drying operations are completed, the upper lid 17 of the washing tower 4 is opened, the vertical container 7 is replaced with the next vertical container 7, and the next operation is carried out in sequence. be able to.

Although the above description is based on FIG. 1, in the present invention, the return path 3b of the liquid circulation line 3 is, as shown in FIG. 4, the bottom of the lower chamber 4b of the washing tower 4 and the liquid in the liquid tank 1. It may be provided between the return port 1b. In this case, the return path 3b can also serve as the return line 6 for the residual cleaning solution.

As shown in FIG. 5, the liquid circulation line 3
At the bottom of the lower chamber 4b of the washing tower 4 and at the return path 3
b may be connected to the upper chamber 4a. In this case, the cleaning agent 2 passes through the inside of the vertical container 7 upward from the lower end.
Since the article to be washed a is made to flow, the washing property is improved. In this case, the mesh member 18 may be provided at the upper end of the vertical container 7 for the purpose of preventing the article a to be cleaned from flowing out.

Further, as shown in FIG. 7, the cleaning tower 4 may be provided with a plurality of sets, for example, three sets of cleaning liquid circulation systems. The three circulation systems are individually provided with liquid tanks 1A, 1B, 1C and circulation lines 3A, 3B, 3C, and can be sequentially switched to be used for cleaning. Further, such a plurality of circulation systems can be used for cleaning in addition to cleaning with different cleaning agents.
This is also convenient when sequentially performing preliminary rinsing and main rinsing.

After cleaning with the cleaning device as described with reference to FIGS. 1 to 7 (hereinafter referred to as “direct cleaning device”), the object to be cleaned is dried by the direct cleaning device. Instead, the drying may be performed by another independent drying device.

[0043]

【The invention's effect】

(1) It is possible to adjust the pH of the detergent composition to a pH that is suitable for an object to be cleaned (various industrial materials, etc.) having various properties, and to favorably prevent the object to be cleaned from being corroded by corrosion or the like. Dirt can be removed. This is effective when the object to be cleaned is a metal-based industrial material or the like.

(2) If the cleaning composition of the present invention is used to clean an object to be cleaned by a direct-through cleaning method, it is possible to efficiently remove a large amount of dirt from the object to be cleaned in a short time. You can

[0045]

The present invention will be described in more detail below with reference to comparative examples and examples, but the present invention is not limited to these examples. Parts and% are based on weight.

Examples 1 to 4 (Preparation of detergent composition) (A) Sodium monohydrogen phosphate (additional product of 2 mol of water) as inorganic phosphoric acid, (B) Diethanolamine as amine, nonionic surfactant Polyoxyethylene (addition mol number 9) nonyl ether was used as the compound, and diethylene glycol monoethyl ether acetate was used as the glycol ether compound, to prepare a detergent composition having the composition (part) shown in Table 1.

[0047]

[Table 1]

Comparative Example 1 A detergent composition comprising 0.3 part of sodium hydroxide, 0.6 part by weight of sodium carbonate, 0.1 part by weight of sodium alkylbenzene sulfonate and 99.0 parts by weight of water was prepared. The pH of the cleaning composition was 13.5.

Comparative Example 2 A detergent composition comprising 0.5 parts of trisodium phosphate and 99.5 parts of water was prepared. PH of the cleaning composition
Was 11.0.

Examples 5 to 7 and Comparative Example 3 25 mm × 50 mm × 0.8 mm test pieces (copper, brass, stainless steel (SUS304), to which oily oil was adhered,
(Using iron, aluminum or nickel) in a vertical container (diameter 7 in FIG. 1) having a diameter of 100 mm and a height of 100 mm having a gap hole only in the bottom, and then the container is directly connected to the container shown in FIG. Installed in the washing tower of the washing machine,
The cleaning composition obtained in each of Examples 1 to 3 or Comparative Example 1 was forcibly flowed into the container at an inflow rate of 20 cm / sec for 5 cleanings.
It was carried out at 0 ° C. for 5 minutes. Then, in the cleaning device, water rinsing was performed at 50 ° C. for 5 minutes, and drying was performed at 60 ° C. for 5 minutes. The washed test piece (object to be cleaned) was evaluated according to the following criteria. Table 2 shows the evaluation results.

Detergency: The remaining residue of oils and fats on the object to be cleaned was visually evaluated by an optical microscope. ○ ---- No oil residue on the object to be cleaned. Δ --- Some oil and fat remains on the object to be cleaned. × −−− There is a fat residue on the object to be cleaned.

Degree of influence on material: Visual evaluation. ○ ---- No change in the item to be cleaned. △ --- Part of the surface of the object to be cleaned is discolored slightly. × −−− Discoloration or rust on the surface of the object to be cleaned.

[0053]

[Table 2]

Example 8 5000 pieces of 1.6 mm × 3.2 mm × 1.0 mm chip ceramic capacitors having oxide film and fine particles of tin oxide adhering to the tin electrode part were formed with gap holes only on the bottom part. After being stored in a vertical container (diameter container 7 in FIG. 1) having a diameter of 100 mm and a height of 100 mm, the container was installed in the cleaning tower of the direct cleaning device shown in FIG. 1 and obtained in Example 4. Flow rate of the obtained detergent composition into the container is 20 cm
/ Forced flow was carried out at / sec, and washing was performed at 50 ° C for 3 minutes. Then, in the cleaning device, water rinsing was performed at 50 ° C. for 3 minutes and drying was performed at 80 ° C. for 5 minutes.

Comparative Example 4 About 50 chip ceramic capacitors similar to those of Example 8
After storing 00 pieces in a basket container having a diameter of 10 cm and a height of 10 cm, the container is ultrasonically cleaned (28 kH).
(Z, 600 W), and the cleaning agent composition obtained in Comparative Example 4 was used for cleaning at 50 ° C. for 3 minutes. Then, after rinsing with water at 50 ° C. for 3 minutes with the ultrasonic device, drying was performed at 80 ° C. for 10 minutes with a normal air dryer.

In each of Example 8 and Comparative Example 4, the cleaned chip ceramic capacitors were evaluated based on the insulation defect occurrence rate (insulation evaluation level: 1 × 10 ⁴ MΩ or more). Table 3 shows the evaluation results.

[0057]

[Table 3]

[Brief description of the drawings]

FIG. 1 is an overall flow chart of a cleaning apparatus for performing a cleaning method of the present invention.

FIG. 2 is a vertical sectional view of a vertical cylinder provided in a cleaning apparatus for performing the cleaning method of the present invention.

FIG. 3 is a plan view of the same.

FIG. 4 is a flowchart showing a modification of the liquid circulation line.

FIG. 5 is a flowchart showing another modification of the embodiment.

FIG. 6 is a flow chart showing an example of the case where a plurality of liquid circulation systems are provided.

FIG. 7 is a flow chart showing an example of a case where a plurality of vertical containers are provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid tank 2 Cleaning composition 3 Liquid circulation line 4 Cleaning tower 5 Liquid feed pump 6 Return line 7 Vertical container 8 Flange part 9 Annular member 10 Seal part 11 Air or hot air supply line 12 Air exhaust line 13 Air blower 14 Heater 15 gas-liquid separator 16 return line 17 upper lid 18 mesh member

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Claims (9)

[Claims] 1. A water-based detergent composition comprising (A) an inorganic phosphoric acid and (B) an amine. 2. A nonionic surfactant and / or
The cleaning composition according to claim 1, which further comprises a glycol ether compound. 3. The cleaning composition according to claim 1, wherein the total content of (A) inorganic phosphoric acid and (B) organic amine is 0.01 to 20% by weight. 4. The cleaning composition according to claim 1, which has a pH of 4 to 10. 5. A vertical column for accommodating an object to be cleaned, which is accommodated and installed in a cleaning tower incorporated in a cleaning agent circulation line in a loosely inserted state and has a body liquid passage hole and a liquid passage hole only at the bottom. After accommodating an object to be cleaned with dirt attached to the shape container, the cleaning agent composition according to any one of claims 1 to 4 is forcedly flowed into the container to clean dirt from the object to be cleaned. A cleaning method characterized by removing. 6. The cleaning method according to claim 5, wherein the cleaning tower is provided with a supply line and a discharge line of air or hot air, which is switchable with the circulation line of the cleaning agent. 7. A vertical container is installed in a washing tower in a suspended state, and the inside of the cleaning tower is divided into an upper chamber and a lower chamber, said container being at the upper end side in the upper chamber and at the lower end side in the lower chamber. The cleaning liquid is communicated with the lower part of the chamber, and the cleaning liquid passes through the upper chamber, the vertical container, the lower part of the lower chamber, and then the upper part of the lower chamber in this order. The cleaning method according to claim 5, wherein the cleaning method comprises: 8. The washing tower is provided with a wind or hot air supply line in the upper chamber and a discharge line in the upper portion of the lower chamber so as to be switchable with the circulation line of the washing liquid, respectively. The described cleaning method. 9. The cleaning method according to claim 5, wherein the vertical container is vertically long, and the ratio of the diameter to the height is 1 to 10 for the former and 1 for the latter.