JPH0625878A - Detergent composition for metallic surface - Google Patents

Abstract

PURPOSE:To clean a metallic surface to get rid of oils, etc., sticking to this surface at low foamability without the possibility of environmental disruption by incorporating the specific polyoxyalkylene compds. expressed by general formulas at a prescribed ratio into the above compsn. CONSTITUTION:This detergent compsn. for the metallic surface is formed of the compsn. consisting, by weight %, of 50 to 97% compd. A (for example, ethylene glycol monobutyl ether) and 3 to 50% compd. B (for example, ethylene glycol dimethyl ether). The above-mentioned compd. A is expressed by the general formula R1O (CnH<2n>O)mH (where R1: 1 to 8C alkyl group or cycloalkyl group, n: an integer from 2 to 4, m: an integer from 1 to 5). The above- mentioned compd. B is expressed by the general formula R2O (CH2CH2O)pR3 (where R2, R3: 1 to 8C alkyl group or cycloalkyl group, P: an integer from 1 to 5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition for cleaning dirt on a metal surface due to a processing oil or a rust preventive oil used in metal processing.

[0002]

2. Description of the Related Art When painting, plating, or surface-treating mechanical parts, precision mechanical parts, electric / electronic devices, etc., use processing oil, heat treatment oil, rust preventive oil, etc. that have adhered to the metal surface in advance. Freon-based or chlorine-based solvents are used for cleaning and removal.

[0003]

However, there is a problem that the CFC-based solvent destroys the ozone layer and the chlorine-based solvent is toxic to the human body. In addition, a water-based cleaning agent that uses a surfactant and an inorganic builder is also used for cleaning metals, but at present it is insufficient to satisfy all the required performance such as cleaning power, toxicity, and odor. is there. In view of the above situation, an object of the present invention is to provide a non-halogen type cleaning agent for metal surfaces, which is excellent in detergency and is satisfactory in environmental characteristics, toxicity, odor and the like.

[0004]

As a result of intensive studies conducted by the present inventors to achieve the above object, the present inventors have found that a composition using a specific polyoxyalkylene compound is suitable as this detergent, and Was completed.

That is, the present invention comprises a compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), and the total weight of (A) and (B): (A) is 50 to 97% by weight based on the above. _{R 1 O (C n H 2n} O) m H (1) ( wherein, R ₁ represents an alkyl group or a cycloalkyl group having 1 to 8 carbon atoms, n represents an integer of 2 to 4, m is an integer of from 1 to 5 R ₂ O (CH ₂ CH ₂ O) _p R ₃ (2) (In the formula, R ₂ and R ₃ are alkyl groups or cycloalkyl groups having 1 to 8 carbon atoms, and p is an integer of 1 to 5. Represents.)

In the general formula (1), R ₁ has 1 to ₁₀ carbon atoms.
Examples of the alkyl group of 8 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, an isopropyl group, a tert-butyl group, a 2-ethylhexyl group, and the like. Examples thereof include a cyclopentyl group, a cyclohexyl group, a cyclooctyl group and the like. Of these, preferred are an alkyl group having 3 to 5 carbon atoms and a cycloalkyl group having 6 to 8 carbon atoms, and particularly preferred is an alkyl group having 4 carbon atoms. If the alkyl group has more than 8 carbon atoms, the cleaning property will be poor. C _n H _2n O in the general formula (1)
Represents an oxyethylene, oxypropylene or oxybutylene group. When m is 2 to 5, (C _n H
_2nO ) _m represents a group to which 2 to 5 mol of ethylene oxide, propylene oxide or butylene oxide is added. This addition format may be single addition, random addition, or block addition. Preferred is ethylene oxide as an essential addition, and particularly preferred is ethylene oxide alone adduct. m is an integer of 1 to 5, preferably 2 to 3. If it exceeds 5, the cleaning property will be poor.

In the general formula (2), examples of the alkyl group having 1 to 8 carbon atoms for R ₂ and R ₃ include a methyl group, an ethyl group,
Examples thereof include a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, an isopropyl group, a tert-butyl group, and a 2-ethylhexyl group. Examples of the cycloalkyl group include a cyclopentyl group, a cyclohexyl group, a cyclooctyl group and the like. Can be given. R ₂ and R ₃ may be the same or different. Among those exemplified as R ₂ and R ₃ , an alkyl group having 1 to 2 carbon atoms is preferable. If the alkyl group has more than 8 carbon atoms, the cleaning property will be poor.
p is an integer of 1 to 5, preferably 2 to 3. p is 5
If it exceeds the range, the cleaning property will be poor.

Specific examples of (A) include (poly) ethylene glycol monoalkyl ethers [ethylene glycol monobutyl ether, ethylene glycol monopentyl ether, ethylene glycol monohexyl ether, ethylene glycol monooctyl ether, diethylene glycol monomethyl ether, Diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monopentyl ether,
Diethylene glycol monohexyl ether, diethylene glycol monooctyl ether, triethylene glycol monomethyl ether, triethylene glycol monopropyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monoethyl ether, triethylene glycol monopentyl ether, etc.]; (poly) propylene glycol Monoalkyl ethers of [propylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol monopentyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, dipropylene glycol propylene Recall mono pentyl ether,
Diethylene glycol monohexyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol monopropyl ether, tripropylene glycol monobutyl ether, etc.]; Monoalkyl ethers in which ethylene oxide and propylene oxide are added [ethylene dipropylene glycol monomethyl Ether, ethylene dipropylene glycol monopropyl ether, ethylene dipropylene glycol monobutyl ether, diethylene dipropylene glycol monomethyl ether,
Diethylene dipropylene glycol monobutyl ether, diethylene propylene glycol monopropyl ether, diethylene propylene glycol monobutyl ether and the like]; and a combination of two or more thereof.

Specific examples of (B) include diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, diethylene glycol methyl ethyl ether and ethylene glycol methyl butyl ether. Combinations of two or more of these may be mentioned.

The cleaning agent of the present invention comprises (A) and (B), and (A) is usually 50 to 97% by weight, preferably 70 to 100% by weight based on the total weight of (A) and (B). It is 95% by weight. If it deviates from this range, the cleaning property will deteriorate.

The detergent of the present invention is mainly composed of glycol ethers, but it may contain other surfactant in order to enhance the permeability and wettability of the detergent. It is also possible to contain water for further flame retardation. Examples of other surfactants include nonylphenol ethylene oxide adducts, octylphenol ethylene oxide adducts, fluorine-based surfactants (perfluoroalkylcarboxylic acid salts, perfluoroalkylethyleneoxide adducts, etc.), and the like. Surfactants are preferred.

When other surfactants are used, the content is
It is usually 8% by weight or less, preferably 5% by weight or less, based on the total weight of (A) and (B). If it exceeds 8% by weight, it may cause stains and corrosion due to residual surfactant.

When water is used, its content is usually 50% by weight or less, preferably 20% by weight or less, more preferably 10% by weight or less, based on the total weight of (A) and (B). If it exceeds 50% by weight, the detergency deteriorates.

In order to clean the surface of a metal such as a machine part using the cleaning agent of the present invention, the metal such as a machine part is immersed in a cleaning agent heated from room temperature to 100 ° C., preferably 30 to 70 ° C. , Ultrasonic cleaning, stirring, or shaking is recommended.
Further, the cleaning agent of the present invention may be used for cleaning by spraying or wiping. After washing, the metal may be pulled out and dried as it is, or may be rinsed with water or warm water and then dried.

[0015]

The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. In the examples,% means% by weight unless otherwise specified.

Examples 1 to 5 and Comparative Examples 1 to 4 (1) Preparation of Cleaning Agent Cleaning agent (a1) of the present invention having the following respective formulation
(A5) and comparative cleaning agents (b1) to (b4) were prepared. Detergent of the present invention (a1) Ethylene glycol monobutyl ether 90% Diethylene glycol dimethyl ether 10% Detergent of the present invention (a2) Diethylene glycol monopropyl ether 70% Diethylene glycol dimethyl ether 30% Detergent of the present invention (a3) Diethylene glycol monobutyl ether 80% Tri Ethylene glycol dimethyl ether 20% Detergent of the present invention (a4) Triethylene glycol monobutyl ether 80% Tetraethylene glycol dimethyl ether 20% Detergent of the present invention (a5) Tetraethylene glycol monoheptyl ether 90% Diethylene glycol diethyl ether 10%

Comparative detergent (b1) Triethylene glycol monomethyl ether 100% Comparative detergent (b2) Hexaethylene glycol monobutyl ether 90% Diethylene glycol diethyl ether 10% Comparative detergent (b3) Diethylene glycol dimethyl ether 100% Comparative wash Agent (b4) Dipropylene glycol monobutyl ether 100%

(2) Detergency test An artificial pollutant having the following composition was applied to a polished and washed metal steel sheet and air-dried at room temperature for 24 hours to give a contaminated sheet. Artificial contaminants Mineral oil: 70% Vegetable oil: 20% Oleic acid: 10% Next, this contaminated plate and the cleaning agents (a1) to (a) of the present invention.
5) and the comparative cleaning agents (b1) to (b4), the contaminated plate is immersed in each cleaning agent at 40 ° C for 60 seconds and ultrasonically cleaned, and then dried at 40 ° C for 30 seconds. It was air dried too.
Subsequently, the artificial pollutant remaining on the steel sheet was extracted with carbon tetrachloride, and the absorbance was measured by infrared absorption spectrum to calculate the cleaning rate. The test results are shown in Table 1.

[0019]

[Table 1]

[0020]

EFFECTS OF THE INVENTION The cleaning agent of the present invention has a cleaning power equal to or higher than that of a halogen-based cleaning agent for metal surfaces. In addition, it is sufficiently satisfactory in terms of odor and flammability. Mechanical parts,
When painting, plating, or surface-treating precision machine parts, electric / electronic devices, etc., it is necessary to wash and remove the processing oil, heat treatment oil, rust preventive oil, etc. adhering to the metal surface in advance. However, the cleaning agent of the present invention is particularly useful for this cleaning.

Claims (1)

[Claims] 1. A compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), which is based on the total weight of (A) and (B). (A)
Is from 50 to 97% by weight. _{R 1 O (C n H 2n} O) m H (1) ( wherein, R ₁ represents an alkyl group or a cycloalkyl group having 1 to 8 carbon atoms, n represents an integer of 2 to 4, m is an integer of from 1 to 5 R ₂ O (CH ₂ CH ₂ O) _p R ₃ (2) (In the formula, R ₂ and R ₃ are alkyl groups or cycloalkyl groups having 1 to 8 carbon atoms, and p is an integer of 1 to 5. Represents.)