JPH0957005A - Dewatering agent and dewatering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate dewatering and to shorten drying time by incorporating carboxylic acid, carboxylic ester, amine, etc., each having a specified structure as essential components into a dewatering agent used in a process for rinsing electronic parts, metallic parts, etc., with water after washing with an aq. detergent. SOLUTION: This dewatering agent contains one or more kinds of compds. represented by the formula R<1> XR<2> (R<1> is 1-18C hydrocarbon, X is -COO- or a group represented by formula II and R<2> is H or 1-18C hydrocarbon) or R<4> Y(A<1> O)n R<5> [R<4> is 1-18C hydrocarbon, (n) is 1-4, Y is -COO-, -NH-or a group represented by formula II, A<1> is 2-4C alkylene and R<5> is H or 1-8C hydrocarbon] as essential components. In the formula I, R<3> is H or 1-4C hydrocarbon. In the formula II, (m) is 1-4 and A<2> is 2-4C alkylene.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention contains electronic parts, metal parts, precision parts and optical parts such as glass and lenses containing an alcohol-based cleaning agent, a hydrocarbon-based cleaning agent, an alkali, water or a surfactant. Wash with water-based cleaning agent and use it when rinsing with water or during final rinsing to shorten the time when water adhering to the surface of the component runs out, reduce the amount of adhering water and reduce the drying time and energy cost of the dryer. It suppresses the generation of water bleeding that may cause problems in appearance or in the post-process, and has a rust preventive effect on metal parts such as steel, copper, aluminum and nickel, and the components of the draining agent volatilize by drying. The present invention relates to a draining agent that hardly stays on the surface of parts. The present invention also relates to a draining method using this draining agent.

[0002]

2. Description of the Related Art Conventionally, for cleaning this kind of parts, a chlorofluorocarbon-based solvent such as trichlorotrifluoroethane or a chlorine-based solvent containing a chlorine-based solvent such as trichloroethylene, perchlorethylene, trichloroethane or ethylene chloride as a main component. A cleaning agent was used. However, chlorine-based and CFC-based solvents have problems such as toxicity to the human body, environmental pollution such as water quality and soil, global warming and ozone layer depletion, and cleaning methods using these solvents are gradually cleaning the aqueous system. It is being replaced by a cleaning method using a chemical. In the case of water-based cleaning, 1) it takes longer time and energy cost in the drying process than solvent cleaning, 2) water stains easily occur due to agglomeration of attached water, 3) rust and discoloration occur on metal parts It has been pointed out that it will happen.

In recent years, various methods have been proposed to solve the problems in this drying process. For example, a hot air dryer is generally used as the dryer, but this requires a long drying time, and therefore the time is shortened by combining it with high pressure air blowing or vacuum drying. As a draining agent, one that uses a solvent such as 2-propanol, one that uses a fluorine-based solvent such as perfluorocarbon, one that thinly adsorbs a fluorine-based surfactant on the surface of the component and repels rinse water, and a nonionic surfactant is used. The ones that have been made are listed.

[0004]

However, a high-pressure air blower or a vacuum dryer requires a large-scale device and is costly. In addition, if a solvent is used, explosion-proof equipment is required, which makes handling and management complicated. The cost of using a fluorine-based solvent is high. The one using a fluorine-based surfactant is effective on a flat plate or the like, but the one having a complicated shape is not so effective because water drops remain. Further, since the fluorosurfactant remains on the surface of the component even after drying, it cannot be used in a product having a post process such as painting. Although a nonionic activator having a complex shape is relatively effective even if it has a complicated shape, residual activator may cause stains.

The object of the present invention is to provide electronic parts, metal parts, precision parts and optical parts such as glass and lenses with alcohol-based cleaning agents, hydrocarbon-based cleaning agents, and water-based cleaning agents containing alkalis or surfactants. After washing, it is a draining agent added in the rinse step with water and used, which is an improvement of the drawbacks of the conventional draining agents as described above, has excellent safety, has no environmental pollution, and has excellent draining performance, The purpose of the present invention is to provide a draining agent which suppresses the generation of water bleeding, has a discoloration preventive effect and a rust preventive effect for metal parts, and which is dried so that the components of the draining agent volatilize and do not easily remain on the surface of the parts.
A further object of the present invention is to provide a draining method using the draining agent.

[0006]

As a result of intensive studies, the present inventors have found that a draining agent containing a compound represented by the general formula (1) or (3) solves the above problems. The present invention has been completed by finding out that That is, the gist of the present invention is as follows: [1] R ¹ XR ² (1) as an essential component (wherein R ¹ represents a hydrocarbon group having 1 to 18 carbon atoms;
Is -COO- or general formula (2)

[0007]

Embedded image

[Wherein R ³ is a hydrogen atom or a carbon number of 1 to 4]
Represents a hydrocarbon group. ] And R < ² > shows a hydrogen atom or a C1-C18 hydrocarbon group. ) Or the general formula (3) R ⁴ Y (A ¹ O) nR ⁵ (3) (In the formula, R ⁴ represents a hydrocarbon group having 1 to 18 carbon atoms, and n
Represents a number from 1 to 4, and Y represents -COO-, -NH-, or the general formula (4).

[0009]

Embedded image

[In the formula, m represents a number of 1 to 4 and A ² represents an alkylene group having 2 to 4 carbon atoms. ] A ¹ represents an alkylene group having 2 to 4 carbon atoms, and R ⁵ represents a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms. A draining agent, characterized by containing one or more compounds represented by the formula (2), [2] a compound represented by the general formula (1) and /
Alternatively, the draining agent according to the above [1], containing 70 to 100% by weight of the compound represented by the general formula (3), [3] the compound represented by the general formula (1) or the compound represented by (3) Is a compound having a nitrogen atom, [1] or [2] described above, [4] boiling point at 1 atmosphere is 100
A draining agent according to any one of [1] to [3] above, which contains 50% by weight or more of a compound having a temperature of ˜350 ° C., [5]
[6] The drainage agent according to any one of [1] to [4] above, which has a surface tension of 50 dyn / cm or less at 25 ° C. when diluted with water so as to be 0.01 to 10% by weight.
In a method of rinsing with water after washing and then draining water, the draining agent according to any one of the above [1] to [5] is rinsed with water so that the draining agent is 0.01 to 10% by weight in the rinse water. The present invention relates to a draining method, which is characterized by being added to.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The draining agent of the present invention is a compound represented by the general formula (1) R ¹ XR ² (1) or a general formula (3) R ⁴ Y (A ¹ O) nR ⁵ (3) It is characterized by containing at least one compound represented by. Among the above compounds, those having a nitrogen atom can obtain a rust preventive effect without using a rust preventive agent,
More preferable.

In the general formula (1), R ¹ has 1 to ¹ carbon atoms.
Although it is a hydrocarbon group having 18 carbon atoms, a hydrocarbon group having 1 to 8 carbon atoms is more preferable. From the viewpoint of increasing the volatility of the draining agent during drying, the carbon number of R ¹ is preferably 18 or less. Examples of the hydrocarbon group for R ¹ include, for example, an alkyl group, an alkenyl group, an aryl group, an aralkyl group, a cycloalkyl group and the like, and those having 1 to 8 carbon atoms are particularly preferable. X is -COO- or general formula (2).

[0013]

Embedded image

(In the formula, R ³ is a hydrogen atom or a carbon number of 1 to 4
Represents a hydrocarbon group. ) Is a group represented by. R ³ is more preferably a hydrogen atom or a hydrocarbon group having 1 to 2 carbon atoms. Here, from the viewpoint of suppressing the deterioration of the solubility in water, the carbon number of R ³ is preferably 4 or less. Specific examples of the hydrocarbon group for R ³ include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group and an isobutyl group, and a methyl group and an ethyl group are more preferable. R
² is a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms, and more preferably a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms. From the viewpoint of suppressing the decrease in volatility and the increase in viscosity, the carbon number of R ² is preferably 18 or less. Specific examples of the hydrocarbon group for R ² include the same as those exemplified for R ¹ .

Therefore, specific examples of the compound represented by the general formula (1) include those shown below. X is-
In the case of COO-, for example, methanoic acid, ethanoic acid, propanoic acid, butanoic acid, 2-methylpropanoic acid, pentanoic acid,
3-methylbutanoic acid, 2,2-dimethylpropanoic acid, hexanoic acid, cyclohexanoic acid, octanoic acid, propenoic acid, propynoic acid, 2-methylpropenoic acid, 2-butenoic acid, benzoic acid, toluic acid and their carbon number 1 The compound esterified with the alcohol of -8 is mentioned. Of these, hexanoic acid, heptanoic acid, octanoic acid, ethyl pentanoate, isopropyl pentanoate, methyl hexanoate, and ethyl hexanoate are preferably used.

When X is a group represented by the general formula (2), examples of the compound represented by the general formula (1) include:
Primary amines such as propylamine, butylamine, pentylamine, hexylamine, octylamine, octylamine, 2-ethylhexylamine, cyclohexylamine, aniline, toluidine, xylidine; hexylmethylamine, hexylethylamine, octylmethylamine, octylhexylamine, dihexylamine. , Dioctylamine,
2 such as diallylamine and di-2-ethylhexylamine
Primary amines; tertiary amines such as dimethylhexylamine, dimethyloctylamine, triallylamine and the like can be mentioned. The compound represented by the general formula (1) can be easily synthesized by a known method, and can be easily obtained through a general trader.

In the general formula (3), R ⁴ has 1 to 1 carbon atoms.
Although it is a hydrocarbon group having 18 carbon atoms, a hydrocarbon group having 3 to 8 carbon atoms is more preferable. The number of carbon atoms is preferably 18 or less from the viewpoint of suppressing deterioration of solubility in water and increase of viscosity. Further, examples of the hydrocarbon group of R ⁴ include, for example, R ¹
Examples of the same as those exemplified above. Y is -COO
-, -NH-, or general formula (4)

[0018]

[Chemical 6]

(In the formula, m represents a number of 1 to 4 and A ² represents an alkylene group having 2 to 4 carbon atoms). More preferably, m is a number of 1 to 3. From the viewpoint of suppressing an increase in viscosity, m is preferably 4 or less. A ² has ² carbon atoms
The alkylene group of 3 to 3 is more preferable. Specific examples of the alkylene group for A ² include an ethylene group, a propylene group and a butylene group, and an ethylene group and a propylene group are preferable. R ⁵ is a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms, and a hydrocarbon group having 1 to 4 carbon atoms is more preferable. From the viewpoint of suppressing deterioration of solubility in water and increase of viscosity, the number of carbon atoms is preferably 8 or less. Examples of the hydrocarbon group of R ⁵ include the same as those exemplified for R ¹ (however, the number of carbon atoms is 1 to 8).

A ¹ is an alkylene group having 2 to 4 carbon atoms, preferably an alkylene group having 2 to 3 carbon atoms. A ¹
Specific examples of the alkylene group include an ethylene group, a propylene group, a butylene group, and the like, and an ethylene group and a propylene group are preferable. n is a number of 1 to 4, but 1 to 3 is more preferable. From the viewpoint of suppressing an increase in viscosity, n is preferably 4 or less.

Therefore, specific examples of the compound represented by the general formula (3) include ethylene glycol monohexanoate, ethylene glycol monobenzoate, diethylene glycol monohexanoate, dipropylene glycol monopropanoate and dipropylene. Carboxylic acid esters such as glycol monobutanoic acid ester and tripropylene glycol monobutanoic acid ester, diethylene glycol butylmethylamine, dipropylene glycol dibutylamine, dipropylene glycol isopropylmethylamine, dipropylene glycol isopropylethylamine, etc. Examples thereof include alkylated compounds.

Of the compounds represented by the general formula (3), Y
Is represented by -COO-, for example, having 1 to 18 carbon atoms.
It can be obtained by adding alkylene oxide having 2 to 4 carbon atoms (ethylene oxide, propylene oxide, butylene oxide, etc.) in a liquid or gas state to the carboxylic acid of the above in the presence of a catalyst such as caustic while heating and reacting. it can. At this time, random addition polymerization in which two or more kinds of alkylene oxides are mixed and reacted, or block addition polymerization in which alkylene oxides are sequentially added is performed, or the terminal hydroxyl group of the compound is methylated or ethylated with alkyl chloride or the like. Butylation may be performed. 1 to 3 carbon atoms used for the production of the general formula (3)
Examples of the carboxylic acid of 18 include methanoic acid, ethanoic acid, propanoic acid, butanoic acid, 2-methylpropanoic acid, pentanoic acid, 3-methylpropanoic acid, 2,2-dimethylpropanoic acid, hexanoic acid, cyclohexanoic acid, Octanoic acid, propenoic acid, propynoic acid, 2-methylpropenoic acid,
2-butenoic acid, benzoic acid, toluic acid and the like can be mentioned.

Further, when Y is —NH— or one represented by the general formula (4), it can be similarly obtained by addition polymerization of an alkylene oxide to an amine having 1 to 18 carbon atoms.
Examples of the amine having 1 to 18 carbon atoms as the raw material include the above-mentioned primary or secondary amines exemplified in the general formula (1). The compound represented by the general formula (3) thus obtained is purified to remove unreacted substances and catalysts and then contained in the draining agent of the present invention.

The compound represented by the general formula (1) or the compound represented by the general formula (3) is used alone or in combination of two or more kinds. Although the water-removing agent containing only these has good water-removing property and water stain preventing ability, for example, a low molecular weight amine compound having a nitrogen atom number of 1 to 5 and a molecular weight of 50 to 200, or a molecular weight of 400. The following fluorine-based alcohol, carboxylic acid or ester may be contained. The inclusion of the above amine compound improves drainage and imparts discoloration prevention and rust prevention effects to metal parts. In addition, the above-mentioned fluorine-based alcohol,
By containing a carboxylic acid or ester, the surface tension of the draining agent of the present invention can be lowered. The content of the compound represented by the general formula (1) and / or the compound represented by the general formula (3) in the draining agent of the present invention is preferably 70 to 100% by weight, and 70 to 100% by weight.
99.9% by weight is more preferable, 90 to 99.9% by weight
Is more preferable, and 95-99.9% by weight is particularly preferable.

The above-mentioned low molecular weight amine compounds include
A compound having 1 to 5 nitrogen atoms and a molecular weight of 50 to 200 is preferably used, and more preferably 1 nitrogen atom is used.
Is a compound having a molecular weight of 70 to 150 and a molecular weight of 70 to 150. The molecular weight is preferably 50 or more from the viewpoint of exhibiting the rust preventive effect, and the molecular weight is 2 from the viewpoint of suppressing the decrease in volatility during drying.
00 or less is preferable. Such an amine compound is preferably used in an amount of 1 to 30% by weight in the draining agent of the present invention,
More preferably, it is contained in an amount of 3 to 10% by weight. From the viewpoint of exhibiting an anticorrosive effect, it is preferable that the amine compound is contained in an amount of 1% by weight or more in the draining agent, and from the viewpoint of suppressing deterioration of the draining performance, 30
It is preferable that the content thereof be equal to or less than the amount by weight.

Specific examples of such low molecular weight amine compounds include monoethanolamine, diethanolamine,
Amino alcohols such as triethanolamine, dimethylethanolamine, dibutylethanolamine, aminoethylethanolamine, methylethanolamine, and methyldiethanolamine; 3- (2-ethylhexyloxy) propylamine, 3-ethoxypropylamine, 3-methoxypropyl Alkoxypropylamines such as amines; morpholines such as morpholine, methylmorpholine, ethylmorpholine, and 3-aminopropylmorpholine; piperazine, triethylenediamine, pentamethyldiethylenetriamine, tetramethylpropylenediamine, and the like. Further, compounds obtained by adding alkylene oxides (ethylene oxide, propylene oxide, butylene oxide, etc.) to these amines and carbonates reacted with carbonic acid are also included.

The fluorine-based alcohol, carboxylic acid, ester or the like preferably has a molecular weight of 400 or less. The molecular weight is preferably 400 or less from the viewpoint of suppressing the decrease in volatility during drying. Such a compound is preferably contained in the draining agent of the present invention in an amount of 0.01 to 5.0% by weight, more preferably 0.1 to 2.0% by weight. From the viewpoint of exerting the effect of lowering the surface tension, it is preferable that the fluorine-based alcohol, carboxylic acid, ester or the like is contained in an amount of 0.01% by weight or more in the draining agent, and it is an expensive compound. It is preferable that the water removing agent is contained in an amount of 5.0% by weight or less. Specific examples of the above compound include, for example, 2- (perfluorohexyl) ethanol, 1H, 1.
H, 5H-octafluoropentanol, 1H, 1H,
7H-dodecafluoroheptanol, perfluoroheptanoic acid, 7H-dodecafluoroheptanoic acid, ethyl difluoroacetate, ethyl perfluorobutyrate and the like can be mentioned.

The other components to be contained in the draining agent of the present invention are city water, distilled water, ion-exchanged water, etc., as long as they do not deteriorate the performance of the draining agent of the present invention. is not. These other components are preferably contained in the draining agent of the present invention in an amount of 5 to 15% by weight.

The draining agent of the present invention contains various components as described above, but when viewed from the boiling point, 50% by weight of a compound having a boiling point of 100 to 350 ° C. at 1 atm.
It is preferable to contain the above compound, and it is more preferable to contain 50% by weight or more of the compound having a boiling point of 150 to 300 ° C. The boiling point is preferably 100 ° C. or higher from the viewpoint of reducing flammability, and 350 ° C. or lower is preferred from the viewpoint of reducing the residual amount on the surface of the component after the drying step. The boiling point here is 100
The compound at ˜350 ° C. may be the compound of the general formula (1) or (3) alone, or may include other additives. Moreover, the smaller the surface tension of the draining agent of the present invention, the more preferable the draining property is. That is, the concentration of the draining agent of the present invention is 25.degree.
The surface tension at the time of 01 to 10% by weight is 50 dyn / cm
The following is preferable, 20 to 35 dyn / cm is more preferable, and 20 to 30 dyn / cm is particularly preferable.

The draining agent of the present invention is added and used in the rinsing step and is preferably used in the draining method of the present invention. That is, the draining method of the present invention is a method of rinsing with water after washing and then draining water, wherein the draining agent is used in an amount of 0.01 to 10% by weight, preferably 0.1 to 5.0% by weight in the rinse water. , Particularly preferably 0.3 to 2.0% by weight, which is added to the rinse water. The concentration of the draining agent of the present invention is preferably 0.01% by weight or more in rinsing water from the viewpoint of exerting drainage property and rust preventive effect, and 10% by weight from the viewpoint of suppressing solubility in water and reduction in volatility during drying. The following are preferred. In addition, the draining agent of the present invention is usually used for reducing the transportation cost and the space for storage as described above.
Although it is diluted at the time of use, it may be adjusted to the above concentration in advance.

Here, the cleaning is usually performed with an alcohol-based cleaning agent, a hydrocarbon-based cleaning agent, a water-based cleaning agent containing an alkali, a surfactant, etc., and the draining agent is the rinse step after the cleaning as described above. Used in. At the time of use, it is diluted with water so that the concentration of the draining agent becomes the above-mentioned concentration. By using such a diluent, excellent drainability and volatility are exhibited.

The specific method of the water draining method of the present invention is not particularly limited. For example, a method of immersing the water removing agent of the present invention in an aqueous solution having the above-mentioned concentration, or using ultrasonic waves together, submerged spray or air spray is used. Etc.

The water-removing agent and the water-removing method of the present invention have an excellent effect in water-removing electronic parts, electric parts, metal industrial parts, precision machine parts, resin processed parts, optical parts and the like. For example, printed wiring boards used in computers and their peripheral devices, home appliances, communication devices, OA devices, and other electronic application devices; hoop materials used in contact members such as IC lead frames, resistors, capacitors, relays; OA Liquid crystal displays used in equipment, watches, computer systems, toys, home appliances, etc .; magnetic recording parts used for video / audio recording / reproducing parts and related parts; semiconductor materials such as silicon and ceramic wafers; quartz vibration Electrostrictive parts such as children; photoelectric conversion parts used in CDs, PDs, copying machines, optical recording machines, etc. The electrical parts include, for example, electric device parts such as brushes, rotors, stators, housings, etc .; ticket issuing parts used in vending machines and various devices; currency inspection parts used in vending machines, cash dispensers, etc. Metal industry parts are transportation equipment parts, home electric appliance parts and metal processed parts. Precision machine parts refer to, for example, bearings used in precision machinery, video recorders, etc .; machining parts such as cemented carbide chips. The resin-processed parts include, for example, precision resin-processed parts used in cameras, automobiles, etc .; resin-molded products such as urethane soles used for shoe soles. Furthermore, as optical parts, cameras, glasses,
There are glass lenses and plastic lenses used in optical equipment, etc.
Examples include a watch case and a watch belt.

[0034]

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

Examples 1 to 10 and Comparative Examples 1 to 4 Draining agent compositions having the compositions shown in Table 1 below were prepared, and each draining agent composition was drained, rustproofed, and
Persistence was evaluated as follows.

(1) Drainability (Glass Beads) 600 glass beads having a diameter of 5.2 mm after being washed cleanly were placed in a cage of a wire net and immersed in an aqueous solution of a draining agent having the concentration shown in Table 1 for 1 minute. The weight after 30 seconds of pulling up was measured, and the amount of attached water (g) was calculated from the difference from the weight before immersion ([weight after immersion (g)]-[weight before immersion (g)]).

(Copper plate) A copper plate having a size of 75 mm × 25 mm × 5 mm (thickness) having 6 holes with a diameter of 4 mm was prepared at 5 places, and 5 plates were piled up with a 0.5 mm washer sandwiched between them. A 40 mm long bolt was passed through the holes at some points and fastened with nuts. After using this test piece and cleaning it cleanly, the test piece was immersed in an aqueous solution of a draining agent having a concentration shown in Table 1 for 1 minute.
The weight after 30 seconds of pulling up was measured, and the amount of attached water (g) was calculated from the difference from the weight before immersion ([weight after immersion (g)]-[weight before immersion (g)]).

(2) Anticorrosion effect In a 50 mL beaker, 25 mL of the water-removing agent aqueous solution having the concentration shown in Table 1 was put, and 40 mm × 30 mm × 1 mm (thickness) cold rolled steel plate (JIS G3141) was added to carbon tetrachloride. After degreasing, the steel sheet was soaked half in the aqueous solution. It was stored in a constant temperature bath at 60 ° C. for 1 hour, and the degree of rust generation was visually observed. Anticorrosion effect evaluation criteria ○: No rust occurs. Δ: Some rust occurred. X: Rust occurred on the entire surface.

(3) Residual property The copper plate whose drainage property was confirmed was dried at 80 ° C. for 10 minutes, and the residue, water stain, and discoloration were confirmed by the weight method and visual inspection. Persistence Evaluation Criteria ⊚: No residue, no bleeding, no discoloration, etc. ◯: Residue is 0 and a slight discoloration is seen, but there is no water stain. Δ: The residue was 0, but discoloration was observed and water bleeding occurred. X: There is a residue. Table 1 shows the above results. In addition, in the examples and the like, the surface tension of the aqueous draining agent solution was measured by the Wilhelmy method at 25 ° C. for the draining agent diluted to a predetermined concentration.

[0040]

[Table 1]

As is clear from Table 1, in Examples 1 to 10 using the draining agent of the present invention, both the draining property and the residual property were excellent, no water bleeding occurred, and almost no discoloration was observed. There wasn't. In particular, those containing nitrogen in the component were excellent in rust prevention effect. On the other hand, Comparative Example 1 which is an example of rinsing with water only, Comparative Example 2 which is an example of using a nonionic activator, and an example which mainly contains one having a large number of carbon atoms and a high boiling point. In Comparative Example 3 and Comparative Example 4, which is an example in which the concentration during rinsing is too high,
Either effect was insufficient.

[0042]

According to the present invention, electronic parts, metal parts,
Precision parts and optical parts such as glass and lenses are cleaned with alcohol-based cleaning agents, hydrocarbon-based cleaning agents, water-based cleaning agents containing alkalis or surfactants, and when rinsing with water or final rinsing It is possible to shorten the time for the water adhering to the to be cut off to reduce the drying time and the energy cost of the dryer. In addition, we suppress outbreak of water bleeding,
Metal parts also have an excellent rust preventive effect, and further drying causes the components of the draining agent to volatilize and hardly remain on the surface of the parts.

Claims (6)

[Claims] 1. An indispensable component represented by the general formula (1) R ¹ XR ² (1) (wherein R ¹ represents a hydrocarbon group having 1 to 18 carbon atoms, X 1
Is -COO- or the general formula (2): [In the formula, R ³ represents a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms. ] And R < ² > shows a hydrogen atom or a C1-C18 hydrocarbon group. ) Or the general formula (3) R ⁴ Y (A ¹ O) nR ⁵ (3) (In the formula, R ⁴ represents a hydrocarbon group having 1 to 18 carbon atoms, and n
Represents a number from 1 to 4, and Y represents -COO-, -NH-, or a compound represented by the general formula (4): Wherein, m represents a number of 1 to 4, A ² represents an alkylene group having 2 to 4 carbon atoms. ] A ¹ represents an alkylene group having 2 to 4 carbon atoms, and R ⁵ represents a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms. ) A draining agent comprising one or more compounds represented by 2. 70 to 100% by weight of a compound represented by the general formula (1) and / or a compound represented by the general formula (3)
The draining agent according to claim 1, which contains. 3. The draining agent according to claim 1, wherein the compound represented by the general formula (1) or the compound represented by (3) has a nitrogen atom. 4. The boiling point at 1 atm is 100 to 350 ° C.
The water draining agent according to any one of claims 1 to 3, which contains 50% by weight or more of the compound. 5. The surface tension when diluted with water to be 0.01 to 10% by weight is 50 dyn / at 25 ° C.
The draining agent according to any one of claims 1 to 4, which has a size of not more than cm. 6. A method of rinsing with water after washing and then draining the water, wherein the draining agent according to claim 1 is used in an amount of 0.01 to 10% by weight in the rinse water. A draining method characterized by adding to rinse water.