JPH03162496A - Detergent composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition excellent in removal of stains such as fats and oils, machine oil, cutting oil, grease and rosin-based flux on a precision component, etc., and excellent in rinsing properties by blending a specified amount of a specified diethylene glycol monoalkyl ether. CONSTITUTION:An objective composition containing (A) >=50wt.% 4-8C alkyl group-containing diethylene glycol monoalkyl ether (suitable example; diethylene glycol monobutyl ether), as necessary, (B) <=50wt.% water and (C) 0.01-30wt.% (especially 3-10wt.%) nonionic surfactant, preferably having 4-15 average HLB.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cleaning composition, and more particularly, to a cleaning composition that cleanses oils, fats, and machine oils that exist on the solid surfaces of precision parts or jigs and tools used in the assembly process thereof. The present invention relates to a cleaning composition which is excellent in removing stains from cutting oil, grease, rosin flux, etc., and has excellent rinsing properties.

[Problems to be solved by conventional techniques and inventions] Conventionally, kerosene, benzene,
Hydrocarbon solvents such as xylene; chlorine solvents such as trichlorethylene and tetrachlorethylene; fluorocarbon solvents such as trichlorotrifluoroethane; water-based cleaning agents containing surfactants and virgoo in sodium orthosilicate and caustic soda, etc. are used. There is. In particular, fluorocarbon solvents or chlorinated solvents are used for electronic, electrical, mechanical, and other parts due to their high cleaning properties and flame retardant properties.

However, cleaning agents using chlorine-based and fluorocarbon-based solvents have major problems in terms of safety, toxicity, environmental pollution, and the like. In addition, hydrocarbon solvents, especially benzene and xylene, are highly toxic compounds and are designated as hazardous substances under the Industrial Safety and Health Act. It is not preferable to use it as an agent. On the other hand, water-based detergents are preferable in that they are less dangerous and toxic than solvent-based detergents, but they are several steps inferior in cleaning power.

Therefore, in recent years, U.S. Pat. No. 4,511,488, U.S. Pat. No. 4,640,719, U.S. Pat.
40. Limonene as seen in Specification No. 247, etc.
Terpenes such as pinene and dibentene have been proposed.

These terpenes, typified by limonene, are compounds that are both safe and easy to clean, but they have a low flash point and require large-scale equipment when used. Furthermore, because it is derived from natural products, it is difficult to obtain products of stable quality, and there is a limit to the amount of supply, making it impractical as an industrial cleaning agent.

On the other hand, rinsability after cleaning is also a problem, since residual cleaning agents may have an adverse effect on plastic parts and the like.

The purpose of the present invention is to improve the above-mentioned drawbacks of the conventional descriptions, to provide excellent cleanability, safety, and no environmental pollution.
Cleaning with excellent rinsing properties to remove dirt such as oil, machine oil, cutting oil, grease, rosin flux, etc. that exists on the solid surface of precision parts or jigs and tools used in the assembly process. The purpose of the present invention is to provide a pharmaceutical composition.

[Means to solve the problem]

Under these circumstances, the present inventors conducted intensive research to solve the above problems and found that a cleaning composition containing a specific diethylene glycol monoalkyl ether satisfies the above conditions. The invention has been completed.

That is, the present invention provides a cleaning composition containing 50% by weight of diethylene glycol monoalkyl ether whose alkyl group has 4 to 8 carbon atoms.

The diethylene glycol monoalkyl ether used in the present invention is one in which the alkyl group has 4 to 8 carbon atoms, and particularly preferred is one in which the alkyl group is a linear chain having 4 to 6 carbon atoms, particularly diethylene glycol monobutyl ether. These diethylene glycol monoalkyl ethers must be contained in the detergent composition of the present invention in an amount of 50% by weight or more in order to maintain detergency and ensure sustainability.

The cleaning composition of the present invention may also contain water in order to improve its flammability. In this case, the blending amount is preferably 50% by weight or less from the viewpoint of cleanability and the like.

The cleaning composition of the present invention exhibits stronger cleaning power by further incorporating a surfactant.

As the surfactant, anionic surfactants, cationic surfactants, amphoteric surfactants, etc. can all be used, but nonionic surfactants are best because they have little effect on the cleaning surface. For example, polyoxyalkylene alkyl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene allylphenol ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkylamine, sorbitan fatty acid ester, polyoxyalkylene, etc. are preferred, and among these, average HLB4~ No. 15 nonionic surfactants exhibit particularly excellent effects.

Here, the polyoxyalkylene refers to a polymer of ethylene oxide, propylene oxide, or butylene oxide.

The amount of these surfactants added is desirably about 0.01 to 30% by weight, particularly 3 to 10% by weight.

0. If the amount is less than 30% by weight, the surfactant will not produce any special effect, while if it exceeds 30% by weight, the surfactant will remain on the cleaned surface and affect the properties of the cleaned parts. There is.

In addition, the cleaning composition of the present invention may further contain various alcohols such as ethanol and glycol, and organic acids such as citric acid, tartaric acid, and phthalic acid, as necessary, within a range that does not impair its effectiveness. .

The cleaning agent of the present invention has a particularly excellent effect on cleaning precision parts and jigs and tools used in the assembly process thereof.
Here, precision parts include, for example, electronic parts, electrical parts, precision mechanical parts, resin-processed parts, optical parts, and the like. here,
Electronic components include, for example, printed wiring boards used in computers and their peripherals, home appliances, communications equipment, OA equipment, and other electronic application equipment; ■C used in contact members such as lead frames, resistors, capacitors, and relays. Hoop materials; Liquid crystal displays used in OA equipment, watches, computer equipment, toys, home appliances, etc.; Magnetic recording parts used in video/audio recording/playback parts and related parts; Semiconductors such as silicon and ceramic wafers. Materials: Electrostrictive parts such as crystal resonators; Photoelectric conversion parts used in CDs, PDs, copying equipment, optical recording equipment, etc. Electrical parts include, for example, electric motor parts such as brushes, rotors, stators, housings, etc.; ticket issuing parts used in vending machines and various devices; coin inspection parts used in vending machines, cash dispensers, etc. Precision mechanical parts include, for example, bearings used in precision drive equipment, video recorders, etc., and machining parts such as carbide tips. Resin processed parts refer to precision resin processed parts used for cameras, automobiles, etc., for example. Further, optical parts include lenses used in cameras, glasses, optical instruments, etc., and other parts include glasses frames, watch cases, watch straps, etc.

In the present invention, the jigs and tools used in the assembly processing process are used to manufacture precision parts such as those shown in the various parts examples above.
It refers to jigs and tools used in various processes such as shaping, processing, assembly, and finishing, as well as various equipment and parts that handle these precision parts.

The cleaning composition of the present invention exhibits suitable performance particularly for the above-mentioned printed wiring boards with residual flux.
Not limited to these examples, substances that interfere with post-processes such as various processing oils and flags during the assembly process,
Alternatively, the cleaning composition of the present invention can be applied to precision parts and jigs and tools that have a solid surface of a certain shape and are covered with various oil-based contaminants that degrade product properties.

The cleaning composition of the present invention is particularly effective when these contaminants are mainly organic oil stains such as oil, machine oil, cutting oil, grease, rosin flux, etc. Even dirt mixed with powder, moisture, etc. can be thoroughly washed and removed.

The cleaning composition of the present invention can be used in various cleaning methods such as immersion method, ultrasonic cleaning method, agitation method, spray method, steam cleaning method, manual wiping method, water displacement drying method, etc., and can produce favorable results. Obtainable.

When the cleaning agent of the present invention is used, for example, in the process of cleaning a printed wiring board to which flux has adhered, for example, first, the cleaning agent composition of the present invention is ultrasonically cleaned in an ultrasonic cleaning tank containing the cleaning agent composition of the present invention,
Efficient cleaning can then be carried out by sequentially carrying out methods such as immersion cleaning in a liquid bath filled with the cleaning composition of the present invention, and finally steam cleaning with the cleaning composition of the present invention. can.

After cleaning, the cleaning composition of the present invention can be easily removed with water or the like. Therefore, the residue will not damage plastic parts, etc.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Examples 1 to 16 and Comparative Examples 1 to 2 Cleaning compositions shown in Table 1 were prepared, and their cleaning properties and flux removal properties were evaluated. The results are shown in Table 1.

(1) Cleanability test 7 0mm x 150mm steel test bead
Naphthenic mineral oil (40℃, 3
50 cst). This test piece, 4
It was immersed in a cleaning solution kept at 0°C and cleaned with ultrasonic waves for 5 minutes. After washing, the washability was visually evaluated.

(Evaluation criteria) Cleanability ◎: Extremely clean surface ○: Almost no mineral oil residue on the surface △: Slight mineral oil residue on the surface ×: Mineral oil residue on the surface (2) Flux removal test IC chip attached The printed wiring board was flagged and then soldered to make a test piece. This test bead was immersed in a cleaning solution maintained at 80° C., and after 5 minutes of ultrasonic cleaning, the removability of 7 lux from the printed wiring board was visually evaluated.

(Evaluation criteria) ◎: No flux residue, extremely high cleaning power ○: Almost no flux residue, great cleaning power △: Slight flux residue, but cleaning power ×: Flux residue, cleaning Example 4, 17 and Comparative Example 3 A cleaning composition shown in Table 2 was prepared, and its flammability,
Biodegradability and water washability (solubility in water) were evaluated. The results are shown in Table 2.

(1) Flammable Cleveland Open Cup
Flammability was evaluated by the Open [:up) method.

(Evaluation basis 1 ◎. No flammability ○: Weak flammability △: Slightly flammable (2) Solubility in water Rinseability with water was evaluated based on solubility in water.

From the results shown in Table 2 below, it was found that the cleaning composition of the present invention has the following advantages. That is, it has a higher flash point than the limonene type, and those containing 10% or more of water are non-flammable and are highly safe to handle. Furthermore, since the detergent composition of the present invention is soluble in water, it was found that it was completely removed by washing with water, and that the influence of residual residue was small.

〔Effect of the invention〕

The cleaning composition of the present invention not only has excellent cleaning properties, safety, and rinsability as described above, but also is a non-fluorocarbon organic solvent and has better wastewater treatment properties than limonene, which is a similar solvent. Therefore, there is no problem of environmental pollution. Furthermore, since the cleaning composition of the present invention is not a raw material derived from natural products, it is excellent in terms of supply stability, and has various advantages such as being easy to handle as it has a weak odor.

Claims (5)

[Claims] 1. A cleaning composition containing 50% by weight or more of diethylene glycol monoalkyl ether whose alkyl group has 4 to 8 carbon atoms. 2. The cleaning composition according to claim 1, further comprising 50% by weight or less of water. 3. The cleaning composition according to claim 1 or 2, further comprising a surfactant. 4. The cleaning composition according to claim 3, wherein the surfactant is a nonionic surfactant with an average HLB of 4 to 15. 5. Claims 1 and 2, which are used for cleaning precision parts.
5. The cleaning composition according to 3 or 4.