JPH07216394A - Detergent - Google Patents

Abstract

PURPOSE:To obtain a detergent which is effective, like a chlorohydrocarbon solvent, in cleaning various stains and overcomes the problems of the environmental pollution or safety by using a specific substd. 1,3-dioxolane compd. CONSTITUTION:This detergent comprises at least one 1,3-dioxolane compd. substd. at the 2- and/or 4-position. The detergent may further contain a hydrocarbon solvent if necessary. Moreover, it may contain a basic compd. to improve its thermal stability and to give it corrosionproofness. When such a mixture is used, the contents of the dioxolane compd., the solvent, and the basic compd. are usually 10wt.% or higher, 90wt.% or lower, and 20wt.% or lower, respectively. Pref. examples of the dioxolane compd. are an alkylated or alkenylated 1,3-dioxolane compd., a spiro-1,3-dioxolane compd., and a hydroxylated 1,3- dioxolane compd.

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 agent which is excellent in removing 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 under rapid progress in the industry. Examples of non-halogen alternative cleaning agents include "Ozone depleting substance use reduction manual, 3rd edition" (published by the Ozone Layer Protection Measures Industry Council,
Alcohol-based cleaning agent, described in May 1, 1993).
Hydrocarbon-based cleaners, water-based cleaners and other cleaners 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 relates to 1, having a substituent at the 2 and / or 4 positions.
A cleaning agent comprising at least one 3-dioxolane compound (A).

In the present invention, the number of carbon atoms per substituent at the 2- and / or 4-position of the compound (A) is usually 1-10. Examples of the compound (A) include
A 1,3-dioxolane compound having a substituent such as a hydrocarbon group having 1 to 10 carbon atoms and a hydroxylalkyl group having 1 to 6 carbon atoms at the 2 and / or 4 positions can be mentioned.

Specific examples of the compound (A) include 2-ethyl-4-methyl-1,3-dioxolane, 2-isopropyl-4-methyl-1,3-dioxolane and 2-propyl-4-methyl-1. , 3-dioxolane, 2-isobutyl-4-methyl-1,3-dioxolane, 2-hexyl-1,3-dioxolane, 2-heptyl-1,3-dioxolane, 2-isoheptyl-1,3-dioxolane,
2- (1-ethylpentyl) -1,3-dioxolane,
4,5-Dimethyl-2-hexyl-1,3-dioxolane, 2,4-dimethyl-2- (4-methyl-3-pentenyl) -1,3-dioxolane, 2-nonyl-1,3-
Alkyl or alkenyl group-substituted 1,3-dioxolane compounds (A1) such as dioxolane; 1,3-dioxolane-2-spiro-cyclopentane, 1,3-dioxolane-2-spiro-cyclohexane, 4-methyl-
1,3-dioxolane-2-spiro-cyclohexane,
Spiro-1,3-dioxolane compounds (A2) such as 1,3-dioxolane-2-spiro-4′-methylcyclohexane; 2-phenyl-4-methyl-1,3-dioxolane, 2-benzyl-1,3 -Aromatic ring-containing 1,3-dioxolane compounds (A3) such as dioxolane and 2-benzyl-4-methyl-1,3-dioxolane; 1,3-
Dioxolane-4-methanol, 2-propyl-1,3
-Hydroxy group-containing 1, such as dioxolane-4-methanol
Examples thereof include 3-dioxolane compound (A4). Among these, A1, A2 and A4 are preferable.

The boiling point of (A) at normal pressure is usually 120 to 2
The temperature is 60 ° C, preferably 140 to 230 ° C. Boiling point is 1
If the temperature is lower than 20 ° C., odor and flammability increase, so that the working environment is deteriorated, which is not preferable. Also, the boiling point is 26
If the temperature exceeds 0 ° C., the drying property after washing is deteriorated, which is not preferable.

The method for producing the 1,3-dioxolane compound (A) is exemplified. (A) by a condensation reaction (acetalization or / ketalization reaction) of one or more of the group (b) with one or more of the polyhydric alcohol (c).
Can be obtained. Examples of the aldehydes (a) include aldehyde compounds having 1 to 10 carbon atoms such as formaldehyde, acetaldehyde, propylaldehyde, n-butyraldehyde, isobutyraldehyde, valeraldehyde, isovaleraldehyde, capronaldehyde, benzaldehyde, benzylaldehyde and the like. Examples thereof include multimers (particularly trimers). Examples of the ketones (b) include ketone compounds having 3 to 10 carbon atoms such as acetone, methyl ethyl ketone, ethyl ketone, propyl ketone, methyl isobutyl ketone, butyl ketone, isobutyl ketone, cyclohexanone, and 4-methylcyclohexanone. As the polyhydric alcohol (c), ethylene glycol, 1,2-propylene glycol,
Carbon number of 1,2-butylene glycol, 1,2-pentylene glycol, 1,2-hexylene glycol, etc. is 2
~ 6 1,2-alkylene glycol and glycerin.

As a component of the detergent of the present invention, a hydrocarbon solvent (B) can be used together with (A) if necessary. Examples of (B) include aliphatic hydrocarbon solvents such as normal paraffin, isoparaffin, cycloparaffin, kerosene, and terpene; aromatic hydrocarbon solvents such as alkylbenzene and alkylnaphthalene, and mixtures thereof. Among these, aliphatic hydrocarbon solvents having a boiling point of 150 to 260 ° C. are preferable, and a boiling point of 1
It is more preferably 80 to 230 ° C. Boiling point is 150 ° C
If it is less than the above range, problems such as odor and danger of ignition occur, and if the boiling point exceeds 260 ° C., the drying property after washing is deteriorated, which is not 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,
The amount of (B) is usually 90% by weight or less, preferably 10
It is 80% by weight.

As a component of the detergent of the present invention, a small amount of the basic compound (C) can be used together with (A) and optionally (B) from the viewpoint of improving the thermal stability of the detergent and preventing rust. Examples of (C) include alkanolamines such as monoethanolamine, diethanolamine and triethanolamine and their alkylene oxide (C2-3) adducts; hexylamine, laurylamine,
Alkylene (C1-20) amine alkylene oxide (C2-3) adducts such as stearylamine and dipropylamine; nitrogen-containing solvents such as pyridine and N-methylpyrrolidone; sodium hydroxide, potassium hydroxide,
Examples include basic inorganic compounds such as calcium hydroxide and sodium carbonate. Among these, alkanolamines and alkylene oxide adducts of alkylamines are preferable, and alkylene oxide adducts of alkylamines are more preferable. When (C) is used, 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 9%.
0% by weight or less and the amount of (C) is usually 20% by weight or less,
It is preferably 0.1 to 10% by weight.

In the present invention, if necessary, one or more surfactants such as anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants may be further added as a component of the detergent of the present invention. Can be used as The amount of these surfactants used is usually 10% by weight or less, preferably 0.2 to 5% by weight of the detergent of the present invention.

Furthermore, in the detergent of the present invention, if necessary, another solvent, a defoaming agent such as silicone, an amine-based or phenol-based antioxidant, a rust preventive, a fungicide, a fungicide. 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.

[0015]

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 and Comparative Examples 1 and 2 detergents having the compositions shown in Table 1 below were prepared, and the detergent removal performance of each detergent was evaluated by the following detergency test. 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 polyester screen printing plate, which was air-dried at 25 ° C. for 5 minutes for contamination. 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

(Cleaning test 4) Six test pieces (60 mm in length) of stainless wire drawing (diameter: 2 mm; fluorine-based lubricant adhered as a contaminant) before cleaning were immersed in the cleaning agent (20 at 50 ° C.). Then, it was dried with hot air at 60 ° C. Then, the six drawn wires were densely arranged in a plane on a black mount and fixed, and the degree of cleaning was measured by measuring the reflectance (%) at 75 degrees 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.

[0021]

[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.

[0023]

EFFECT OF THE INVENTION The cleaning agent of the present invention has a detergency against various stains that is equal to or higher than that of a conventional chlorinated hydrocarbon solvent, and is equal to or higher than that depending on the type of stain, and can deal with a wide range of stains and is non-halogen. Since the system is also highly safe, it can be used in a wide range of industrial fields as a substitute cleaning agent for 1,1,1-trichloroethane which is an ozone depleting substance.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C11D 7:26 7:24) (C11D 7/60 7:26 7:32)

Claims (6)

[Claims] 1. A detergent comprising at least one 1,3-dioxolane compound (A) having a substituent at the 2- and / or 4-position. 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 the hydrocarbon solvent (B). 3. The cleaning agent according to claim 1, which contains 10% by weight or more of (A) and may further contain 20% by weight or less of the basic compound (C). 4. The number of carbon atoms per substituent is 1 to 10
The cleaning agent according to any one of claims 1 to 3. 5. The cleaning agent according to claim 3, wherein (C) is an alkylene oxide adduct of alkylamine. 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.