JPH07138595A - Detergent - Google Patents

Abstract

PURPOSE:To obtain a halogen-free detergent having a detergency for various stains which is comparable to those of chlorinated hydrocarbon solvents, by using a specific glycol monoester compd. or an etherification or esterification product thereof. CONSTITUTION:(A) at least one of glycol monoester compds. prepd. by polymn. of 3 molecules of at least one 2-6C aliph. aldehyde, and etherification or esterification products thereof is blended in a detergent. It is pref. that at least 10wt.% component (A) be blended with (B) at most 90wt.% glycol ether compd. It is also pref. that at least 10wt.% component (A) be blended with at most 50wt.% water and, if necessary, (C) at most 20wt.% surfactant. It is further pref. that at least 10wt.% component (A) be blended with (D) a hydrocarbon solvent in an amt. of at most 90wt.% based on (A)+(D). Additionally stated, in the case of (A), (A)+(B), (A)+ water, or (A)+ water +(C), the aliph. aldehyde is pref. acetaldehyde, propionaldehyde, or the like.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to fingerprints, oils and fats, machine oils, cutting oils, greases and waxes present on the surface of objects to be cleaned such as metalworked products, electronic parts, optical parts, resin molded products and printing plates. The present invention relates to a non-halogen type cleaning composition having excellent removability of stains such as liquid crystal, rosin-based flux, printing ink, metal powder and dust.

[0002]

2. Description of the Related Art Conventionally, mechanical oil adhered to the surface of mechanical metals, electric products, electronic parts, optical parts, resin molded products,
As a cleaning agent to remove organic stains such as grease, flux, wax, ink and fingerprints, and stains such as fine powder of metals and glass, halogenated hydrocarbon solvents such as trichloroethane and trichlorotrifluoroethane. Is used. Halogenated hydrocarbon solvents are very easy-to-use solvents that not only clean a wide range of stains but also are non-flammable and dry, but some of these have been found to destroy the ozone layer in the atmosphere. The regulations on the use of these solvents are being tightened from the standpoints of environmental pollution and safety. Therefore, the replacement of these halogenated hydrocarbon solvents with non-halogen detergents is currently being promoted at a rapid pace in the industry, and examples of non-halogen alternative detergents include "reduction of use of ozone-depleting substances. Manual 3rd Edition "(published by the Council for Measures against Ozone Layer Protection,
Alcohol-based cleaning agents, hydrocarbon-based cleaning agents, water-based cleaning agents, and other cleaning agents described in May 1, 1993) are known.

[0003]

However, although alcohol-based detergents have excellent flux detergency, they are inferior in degreasing ability to chlorinated hydrocarbon solvents such as trichloroethane. Hydrocarbon-based cleaning agents have excellent degreasing power, but have a difficulty in cleaning highly polar organic stains. The water-based cleaning agent has a drawback that stains and rust are easily generated on the surface of the object to be cleaned. Although other alternative cleaning agents are currently under development, a non-halogen alternative cleaning agent that can deal with a wide range of stains like chlorinated hydrocarbon solvents such as trichloroethane has not yet appeared.

[0004]

Means for Solving the Problems The present inventor diligently studied to obtain a non-halogen type cleaning agent which can deal with a wide range of stains like the chlorinated hydrocarbon type solvent and can improve environmental pollution and safety problems. As a result, the present invention has been reached. That is, the present invention is a detergent comprising a glycol monoester compound obtained by polymerizing one or more kinds of 3 or more molecules of an aliphatic aldehyde having 2 to 6 carbon atoms or one or more kinds of an etherified or esterified product (A) thereof. Is.

In the present invention, examples of the aliphatic aldehyde having 2 to 6 carbon atoms include acetaldehyde, propyl aldehyde, n-butyraldehyde, isobutyraldehyde, valeraldehyde, isovaleraldehyde, capronaldehyde and the like. In the present invention, the glycol monoester compound includes, for example, one or more aliphatic aldehydes having 2 to 6 carbon atoms, Mg (OC ₂ H ₅ ) ₂ , Ca
(OC ₂ H ₅ ) ₂ , Mg [Al (OC ₂ H ₅ ) ₄ ] ₂ , Na ₂ M
3 in the presence of a weakly basic coordination catalyst such as g (OC ₂ H ₅ ) _4.
It is obtained by polymerizing a molecule, and its chemical formula is represented by the following formula (1).

[0006]

[Chemical 1]

(In the formula, Z represents a divalent aliphatic hydrocarbon group having 2 to 6 carbon atoms, and R ¹ , R ² , R ³ and R ⁴ are independently hydrogen or an aliphatic group having 1 to 4 carbon atoms. It represents a hydrocarbon group.). Examples of etherification products of this glycol monoester compound include lower alkyl (having 1 to 1 carbon atoms).
6) Ether compounds, that is, glycol monoester monoether compounds, and examples of the ester compounds include lower fatty acid (C2-6) ester compounds such as acetic acid, that is, glycol diester compounds. Among these, preferred as (A) is a glycol monoester compound, and specific examples thereof include 1,3-butanediol monoacetate (a trimolecular polymer of acetaldehyde; boiling point 210 ° C.), 2-methyl-1, 3-Pentanediol monopropionate (3 of propionaldehyde
Molecular polymer; boiling point 235 ° C.), 2-ethyl 1,3-hexanediol monobutyrate (trimolecular polymer of n-butyraldehyde; boiling point 255 ° C.), 2,2,4-trimethyl-1,3-pentane Examples thereof include diol monoisobutyrate (a trimolecular polymer of isobutyraldehyde; boiling point 248 ° C.). The boiling point of (A) at normal pressure is usually 150 to
The temperature is 300 ° C, preferably 180 to 260 ° C. If the boiling point is less than 150 ° C, odor and flammability will increase, so
The work environment is not good, which is not preferable. Also, the boiling point is 3
When the temperature exceeds 00 ° C, the drying property after washing is deteriorated, which is not preferable.

As a component of the detergent of the present invention, a glycol ether compound (B) can be used together with (A) if necessary. The glycol ether compound (B) has the following general formula (2)

[0009]

[Chemical 2]

(In the formula, Y represents an alkylene group having 2 to 4 carbon atoms, R ⁵ represents a hydrocarbon group having 1 to 8 carbon atoms, R ⁶ represents hydrogen, a hydrocarbon group having 1 to 8 carbon atoms, or It represents an acyl group, and n represents an integer of 1 to 4.). Specific examples thereof include compounds described in JP-A-4-325598. Among these, mono or diethylene glycol monoalkyl (C1-C1
6) Ethers, mono- or dipropylene glycol (having 1 to 6 carbon atoms) monoalkyl ethers, and mono- or diethylene glycol dialkyl (having 1 to 6 carbon atoms) ethers are preferable. When (A) and (B) are used in combination, the amount of (A) in the detergent of the present invention is usually 10% by weight or more, and the amount of (B) is usually 90% by weight or less, preferably 1%.
It is 0 to 80% by weight.

As a component of the cleaning agent of the present invention, an appropriate amount of water can be used together with (A) and optionally (B) for the purpose of lowering the flammability. When using water,
The amount of (A) in the cleaning agent of the present invention is usually 10% by weight or more,
The amount of (B) is usually 90% by weight or less, and the amount of water is usually 50% by weight or less, preferably 0.5 to 20% by weight.

When water is used in combination as described above, an anionic surfactant, a cationic surfactant, and
One or more surfactants (C) such as amphoteric surfactants and nonionic surfactants can be used together with water as a component of the detergent of the present invention. The amount of these surfactants (C) used is usually 20% by weight or less, preferably 0.2% by weight of the detergent of the present invention.
10 to 10% by weight.

Further, the cleaning agent of the present invention may be a combination of (A) and a hydrocarbon solvent (D), and the range of stains can be widened by the combined use. Examples of the hydrocarbon solvent (D) include aliphatic hydrocarbon solvents such as normal paraffin, isoparaffin, cycloparaffin, kerosene and terpene; aromatic hydrocarbon solvents such as alkylbenzene and alkylnaphthalene, and a mixture thereof. Among these, aliphatic hydrocarbon solvents having a boiling point of 150 to 300 ° C. are preferable, and a boiling point of 180
Those having a temperature of up to 260 ° C are more preferable. If the boiling point is less than 150 ° C, there will be problems with odor and fire hazard, and the boiling point will be 3
When the temperature exceeds 00 ° C, the drying property after washing is deteriorated, which is not preferable. When (A) and (D) are used in combination, the amount of (A) in the detergent of the present invention is usually 10% by weight or more, and the amount of the hydrocarbon solvent (D) is (A) + (D 90% by weight or less, preferably 20 to 80% by weight, of the total amount of the above).

Further, in the detergent of the present invention, if necessary, other solvent, antifoaming agent such as silicone, amine-based or phenol-based antioxidant, anticorrosive agent, antibacterial agent, antifungal agent. Etc. can be blended.

The cleaning agent of the present invention can be used by applying various cleaning methods such as an immersion cleaning method, an ultrasonic cleaning method, a jet method, a spray method and a steam cleaning method.

[0016]

The present invention will be further described with reference to the following examples.
The present invention is not limited to this. Hereinafter, parts in the examples are parts by weight.

Examples 1 to 6, Comparative Examples 1 and 2, detergents having the compositions shown in Table 1 below were prepared, and the detergent removal properties of the detergents were evaluated by the following detergency tests. The results are shown in Table 1.

(Cleaning test 1) Pollutants (mineral oil 70%, vegetable oil 20%, oleic acid 1
0%) was applied and air dried at room temperature for 24 hours to prepare a test piece of a contaminated plate. After ultrasonic cleaning (1 minute at 50 ° C) of each test piece in each cleaning agent, 50 ° C
It was dried with hot air. Then, the contaminants remaining on the steel sheet were extracted with carbon tetrachloride, the absorbance was measured by an infrared absorption spectrum, and the cleaning rate was obtained from a calibration curve showing the relationship between the absorbance and the contaminant concentration.

(Cleaning test 2) A commercially available rosin-based solder flux (Flux SR-12A-20 manufactured by Senju Metal Co., Ltd.) was applied to a clean glass plate, and then heated and dried at 150 ° C. to give a test piece of a contaminated plate. Created. Immerse this test piece in each cleaning agent (1 minute at 50 ℃),
Further, the amount of flux remaining on the glass plate after being rinsed with running water and dried was visually evaluated according to the following criteria. ◯: No flux on the glass plate △: Some flux on the glass plate ×: A large amount of flux on the glass plate

(Washing test 3) A commercially available ink (Solder resist UVF-2G manufactured by Asahi Kaken Co., Ltd.) was applied to a 250 mesh mesh screened polyester screen printing plate, and air-dried at 25 ° C. for 5 minutes to contaminate it. The test piece of the board was created. After ultrasonically cleaning this test piece in a cleaning agent (at 40 ° C. for 1 minute), the amount of ink remaining on the screen printing plate was visually evaluated according to the following criteria. ◎: No ink on the screen printing plate ○: Very little ink remained on the screen printing plate △: Ink remained as a thin film on the screen printing plate ×: Large amount of ink remained on the screen printing plate

(Washing test 4) Six test pieces (60 mm in length) of stainless wire drawing (diameter: 2 mm; fluorine-based lubricant adhered as a pollutant) before washing were immersed and washed in a detergent (20 at 50 ° C.). Then, it was dried with hot air at 60 ° C. Then, the 6 drawn wires were closely arranged in a plane on a black mount and fixed, and the degree of cleaning was measured by measuring the reflectance (%) at 75 ° with a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd.). Was evaluated. The larger the value, the greater the gloss and the better the washability.

[0022]

[Table 1]

As is clear from Table 1, the cleaning agent of the present invention composed of a specific compound is superior to other alternative cleaning agents such as hydrocarbon-based cleaning agents and alcohol-based cleaning agents in a wide range of cleaning power. It has a wide range of detergency almost equal to that of conventional 1,1,1-trichloroethane. Further, the cleaning agent of the present invention of Example 6 has no flash point, corresponds to a non-dangerous substance under the Fire Service Law, and is excellent in fire safety.

[0024]

EFFECT OF THE INVENTION The cleaning agent of the present invention has a detergency against various stains equivalent to that of a conventional chlorinated hydrocarbon solvent, and is widely used as an alternative cleaning agent for 1,1,1-trichloroethane which is an ozone depleting substance. It can be used in the industrial field.

Claims (6)

[Claims] 1. A detergent comprising a glycol monoester compound obtained by polymerizing one or more 3 molecules of an aliphatic aldehyde having 2 to 6 carbon atoms or one or more etherification or esterification products (A) thereof. . 2. The cleaning agent according to claim 1, which may contain 10% by weight or more of (A) and 90% by weight or less of glycol ether compound (B). 3. A content of 10% by weight or more of (A), 50% by weight or less of water, and optionally 2% of a surfactant (C).
The cleaning agent according to claim 1 or 2, which may be contained in an amount of 0% by weight or less. 4. The cleaning agent according to claim 1, wherein the aliphatic aldehyde is acetaldehyde, propyl aldehyde, n-butyraldehyde or isobutyraldehyde. 5. The composition contains 10% by weight or more of (A), and further contains 90% by weight of a hydrocarbon solvent (D) with respect to the total amount of (A) and (D).
The cleaning agent according to claim 1, which may be contained in an amount of not more than 5% by weight. 6. The cleaning agent according to claim 1, which is a cleaning agent for metal working products, electronic parts, optical parts, resin molded products or printing plates.