JP2819156B2 - Detergent composition - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to cleaning compositions for precision parts or jigs and tools used in the process of assembling and processing the same, and more particularly to cleaning compositions on solid surfaces thereof. Excellent in removing dirt components such as oils and fats, machine oil, cutting oil, grease, rosin flux, etc.
The present invention relates to a detergent composition which is less deteriorated by these stains and has low toxicity.

[Conventional technology]

Conventionally, removal of dirt mainly composed of organic substances such as oil existing on solid surfaces such as precision parts and jigs and tools is performed by using hydrocarbon solvents such as kerosene, benzene and xylene; chlorine solvents such as trichloroethylene and tetrachloroethylene; CFC-based solvents such as trifluoroethane; surfactants and the like are used in sodium orthosilicate and sodium hydroxide. In particular, fluorocarbon-based solvents or chlorine-based solvents are used in spray products such as electronics, electricity, and machinery, taking advantage of their high washability and flame retardancy.

In recent years, as a highly environmentally friendly and highly safe cleaning agent, U.S. Patent Nos. 4,511,488 and 4,640,7
Terpenes such as limonene, pinene, dipentene and the like, which are found in the specifications of JP-A No. 19, 4,740,247 and the like, have also been proposed.

[Problems to be solved by the invention]

However, none of these cleaning agents satisfy all of the conditions required for the cleaning composition, such as stain removal property, deterioration resistance and low toxicity.
That is, cleaning agents using chlorine-based and chlorofluorocarbon-based solvents have serious problems in safety, toxicity, environmental pollution, and the like. In addition, hydrocarbon-based cleaning agents, especially benzene, xylene, etc. are highly toxic, are compounds designated as harmful substances under the Industrial Safety and Health Act, and taking into account the danger and complexity of working with them, It is not preferable to use it as a cleaning agent. On the other hand, water-based detergents are preferred in that they are less dangerous and toxic than solvent-based detergents, but are several times inferior in detergency. In addition, tenpenes represented by limonene are compounds that can achieve both safety and detergency, but are not only easily deteriorated during use but also have a problem of durability. Is difficult to obtain, is expensive, has a limited supply, and is not practical as an industrial detergent.

SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the prior art as described above, and to provide jigs and tools used in precision parts or their assembling process, which are excellent in washability, deterioration resistance and safety and free of contamination environment. Grease, machine oil, cutting oil,
It is an object of the present invention to provide a detergent composition for removing dirt components such as grease and rosin flux.

[Means for solving the problem]

Under these circumstances, the present inventors have conducted intensive studies to solve the above problems, and as a result, have found that a saturated alkylbenzene having a specific carbon number range can be used as a detergent composition satisfying the above conditions. Thus, the present invention has been completed.

That is, the present invention provides a precision part containing 70% by weight or more of a saturated alkylbenzene having 10 to 15 carbon atoms and a surfactant, or a cleaning composition for jigs and tools used for the precision part.

It is essential that the alkylbenzene used in the present invention has a saturated alkyl unit. In the case of a benzene derivative substituted with an unsaturated alkyl group, the detergency is not bad, but the deterioration during use is severe, which is unsuitable for the purpose of the present invention. Further, it is an essential requirement that the total number of carbon atoms be in the range of 10 to 15 from the viewpoint of the balance between the aliphatic and aromatic properties. Within this range, a stable and good detergency can be obtained similarly when the polarity of the oil of the soil component is large or small. Among them, those having 10 to 12 carbon atoms are particularly preferable. Examples of such a saturated alkylbenzene include cymene, durene, t-butyltoluene, mesitylene, diisopropylbenzene, t
-Butylbenzene and the like. Of these, cymene, diisopropylbenzene and the like are particularly excellent. These saturated alkylbenzenes must be contained in the detergent composition of the present invention in an amount of 70% by weight or more in order to maintain the detergency and ensure the durability.

The detergent composition of the present invention exerts a stronger detergency by further mixing alcohol.

As the surfactant, any of an anionic surfactant, a cationic surfactant, a zwitterionic surfactant and the like can be used, but a nonionic surfactant is most preferable in that it has little influence on a cleaning surface. For example, polyoxyalkylene alkyl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene allyl phenol ether,
Polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkylamines, sorbitan fatty acid esters, polyoxyalkylenes and the like are preferable, and among them, nonionic surfactants having an average HLB of 4 to 15 exhibit particularly excellent effects. Here, the polyoxyalkylene is
It refers to a polymer of ethylene oxide, propylene oxide or butylene oxide.

As the alcohol, those having 6 to 18 carbon atoms are preferable, for example, octyl alcohol, lauryl alcohol,
Natural and synthetic alcohols such as oleyl alcohol and geribe alcohol are included.

The total amount of the surfactant and / or the alcohol is preferably about 0.01 to 30% by weight, and particularly preferably 3 to 10% by weight. If the content is less than 0.01% by weight, no special effect due to the addition of the surfactant and / or the alcohol is not exhibited.
Exceeding weight percent may leave surfactant on the cleaning surface and affect the properties of the cleaned part.

Further, the cleaning composition of the present invention may further contain various alcohols such as ethanol and glycol, citric acid, tartaric acid, and organic acids such as phthalic acid, if necessary, as long as the effects are not impaired. .

The cleaning agent of the present invention has a particularly excellent effect for cleaning precision parts and jigs and tools used in the assembling process.

In the present invention, the precision parts refer to, for example, electronic parts, electric parts, precision machine parts, resin processed parts, optical parts and the like. Here, the electronic component is, for example, a printed wiring board used in computers and their peripheral devices, home appliances, communication devices, OA devices, other electronic application devices, and the like; contact members such as IC lead frames, resistors, capacitors, and relays. Hoop materials used for OA equipment, clocks, computer equipment, toys, liquid crystal displays used for home appliances, etc .; magnetic recording parts used for video / audio recording / reproducing parts, related parts, etc .; silicon and ceramic wafers Semiconductor materials such as quartz oscillators; photoelectric conversion components used in CDs, PDs, copying machines, optical recording devices and the like. Electric parts are, for example, motor parts such as brushes, rotors, stators and housings;
Ticketing parts used in vending machines and various devices; money inspection parts used in vending machines, cash dispensers, and the like. Precision machine parts refer to, for example, bearings used in precision driving equipment, video recorders, and the like; machining parts such as carbide tips and the like. The resin processed parts refer to precision resin processed parts used for cameras, automobiles, and the like, for example. Further, as the optical component, there is a lens used for a camera, spectacles, optical equipment and the like, and as other components, a spectacle frame, a watch case, a watch belt and the like are exemplified.

In the present invention, the jigs and tools used in the assembling process include manufacturing jigs and tools for manufacturing precision parts as shown in the above-described various component examples in various processes such as forming, processing, assembling, and finishing. In addition, it refers to various devices handling these precision components, their components, and the like.

The cleaning composition of the present invention, particularly among the above, exhibits suitable performance for a printed wiring board in which flux remains, but precision parts and jigs and tools which are the subject of the present invention are described in these examples. Not limited to, precision parts with a solid surface of a certain shape adhering to various processing oils, fluxes and other interfering substances such as flux in the assembly processing process, or various oily contaminants that degrade the characteristics of the product The cleaning composition of the present invention can be applied to jigs and tools.

When these contaminants are mainly organic oil stains such as oils and fats, machine oils, cutting oils, greases, rosin-based fluxes, etc., the detergent composition of the present invention is particularly effective, and metal powders and inorganic powders Even dirt mixed with water or the like can be sufficiently washed and removed.

The cleaning composition of the present invention can be used in various cleaning methods such as an immersion method, an ultrasonic cleaning method, a rocking method, a spray method, a steam cleaning method, a hand wiping method, and a water displacement drying method, and obtains favorable results. be able to.

When the cleaning agent of the present invention is used in a step of cleaning a printed wiring board to which flux is attached, for example, first,
The cleaning composition of the present invention is subjected to ultrasonic cleaning in an ultrasonic cleaning tank, followed by 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. By performing such a method continuously, efficient cleaning can be achieved.

〔Example〕

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

Examples 1 to 6 and Comparative Examples 1 to 5 Naphthenic mineral oil (40 ° C., 350 cst) is applied to a 70 mm × 150 mm steel test piece at a rate of 500 mg / m ² . This test piece is immersed in a cleaning solution kept at 40 ° C.
Washed for minutes. After washing, the washing property was visually evaluated.

In addition, in order to examine the cleaning property when contamination was found, a cleaning liquid to which the above naphthenic mineral oil was added at 20% by weight was prepared, and the same cleaning test was performed.

To check the deterioration resistance of the washing solution, 100 ml each of diisopropylbenzene, vinyltoluene, cymene and limonene was placed in a 300 ml glass container, and 10 g each of copper powder and iron powder was added thereto. And heated.
Vinyltoluene and limonene having an unsaturated alkyl group increased in viscosity due to thermal degradation, but no change was observed in cymene and diisopropylbenzene having a saturated alkyl group.

 The results are shown in Table 1.

(Evaluation criteria) Detergency ◎: Very clean on the surface ○: Almost no mineral oil residue on the surface △: Minor oil residue on the surface slightly ×: Mineral oil residue on the surface Deterioration resistance ◎: No thickening at all ○: Slightly thickened △: Thickened X: Notable thickening Examples 7 to 12 and Comparative Examples 6 to 7 A printed wiring board on which an IC chip was mounted was subjected to flux treatment, followed by soldering to obtain test pieces. The test piece was immersed in a cleaning solution kept at 80 ° C., and after ultrasonic cleaning for 5 minutes, the removability of the flux from the printed wiring board was visually evaluated. The results are shown in Table 2.

(Evaluation criteria) ：: No residual flux and extremely high cleaning power ○: Little residual flux and high cleaning power △: Slight residual flux but high cleaning power ×: Flux remaining and cleaning Poor [Effects of the Invention] As described above, according to the present invention, a cleaning agent for jigs and tools used in a precision part or its assembling process which is excellent in detergency, deterioration resistance and safety, and has no environmental pollution. A composition is provided.

Claims (3)

(57) [Claims] (1) a saturated alkylbenzene having 10 to 15 carbon atoms
A cleaning composition for precision parts or jigs and tools used therefor containing at least% by weight and a surfactant. 2. The cleaning composition according to claim 1, wherein the surfactant is a nonionic surfactant having an average HLB of 4 to 15. 3. The cleaning composition according to claim 1, further comprising an alcohol having 6 to 18 carbon atoms.