JP2639733B2 - Detergent composition - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a detergent composition, and more particularly, to oils, fats and machine oils present on a solid surface of a precision part or a jig used for an assembling process thereof. The present invention relates to a detergent composition which is excellent in removing dirt such as grease, rosin-based flux and the like, is hardly deteriorated by such dirt components, 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; A chlorofluorocarbon-based solvent such as trifluoroethane; an aqueous cleaning agent prepared by mixing a surfactant and a builder with sodium orthosilicate or caustic soda are used. In particular, components such as electronics, electricity, and machinery use a chlorofluorocarbon-based solvent or a chlorinated solvent because of their high cleaning properties and incombustibility.

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 solvents, particularly benzene and xylene, have high toxicity, and Since these compounds are designated as harmful substances under the Health and Safety Law, they are not preferable to be used as cleaning agents in view of the danger and complexity of handling them. 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. Terpenes represented by limonene are compounds that can achieve both safety and detergency, but are liable to deteriorate when used and have problems with durability. Is difficult to obtain, is expensive, has a limited supply, and is not practical as an industrial detergent.

Accordingly, the present invention improves the above-mentioned disadvantages of the prior art, and removes oils, fats, machine oils, greases, rosin-based fluxes, etc. present on the solid surfaces of precision parts or jigs used in the assembling process thereof. It is an object of the present invention to provide a detergent composition which is excellent in soil removal, deterioration resistance and safety, and has no environmental pollution.

[Means for solving the problem]

In such achievements, the present inventors have conducted intensive research to solve the above problems, and as a result, a cyclic saturated hydrocarbon 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 detergent composition containing 70% by weight or more of a cyclic saturated hydrocarbon having 9 to 18 carbon atoms.

The cyclic hydrocarbon used in the present invention needs to be a saturated cyclic hydrocarbon. By selecting a cyclic hydrocarbon having an unsaturated alkyl bond having an appropriate number of carbon atoms, it is possible to improve the detergency to some extent, but the deterioration during use is remarkable, and it is unsuitable. Further, the number of carbon atoms is 9 to 18, particularly preferably 10 to 15 carbon atoms. If the number of carbon atoms deviates from this range, cyclic saturated hydrocarbons are liable to evaporate and catch fire during washing. It is inferior in terms of safety, and a good cleaning effect cannot be obtained. As such cyclic saturated hydrocarbon, for example, those obtained by hydrogenating terpenes or aromatic compounds are used. Additives.

These cyclic saturated hydrocarbons need to be contained in the cleaning composition of the present invention in an amount of 70% by weight or more in order to maintain detergency and ensure durability.

The detergent composition of the present invention further comprises an aliphatic alcohol and a surfactant alone or in combination.
The effect can be further increased.

As the aliphatic alcohol, an aliphatic alcohol having 6 to 18 carbon atoms is used. For example, hexyl alcohol, octyl alcohol, lauryl alcohol, oleyl alcohol, Guerbet alcohol, and alcohols synthesized by the oxo method can be used. And various alcohols.

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 used because it has little effect on a cleaning surface. The best. For example, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenol ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene allyl phenol ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkylamine, sorbitan fatty acid ester, polyoxyalkylene and the like are preferable. Among them, nonionic surfactants having an average HLB of 4 to 15 exhibit particularly excellent effects. Here, the polyoxyalkylene is preferably a polymer of ethylene oxide, propylene oxide or butylene oxide.

The amount of these aliphatic alcohols and surfactants is preferably 0.1 to 30% by weight in total in the detergent composition of the present invention. If the amount is less than 0.1% by weight, the effect of the addition thereof is not exhibited, and If it exceeds 30% by weight, the surfactant may remain on the cleaning surface and affect the properties of the cleaned part.

Further, the detergent composition of the present invention may further contain various alcohols such as ethanol and glycol, citric acid, tartaric acid, organic acids such as phthalic acid, rust inhibitors, and preservatives, as long as the effects are not impaired. , An antifoaming agent, an antioxidant, and the like.

The cleaning composition 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, precision parts refer to, for example, electronic parts, electric parts, precision machine parts, resin processed parts, optical parts and the like. Here, the electronic components include, for example, printed wiring boards used in computers and their peripheral devices, home appliances, communication devices, OA devices, and other electronic devices; contact members such as IC lead frames, resistors, capacitors, and relays. Hoop material 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 and related parts; silicon and ceramic wafers Semiconductor materials; electrostrictive components such as quartz oscillators; and photoelectric conversion components used for CDs, PDs, copiers, optical recording devices, and the like. Examples of the electric parts include motor parts such as brushes, rotors, stators, and housings; ticketing parts used for vending machines and various devices; and currency inspection parts used for vending machines and cash dispensers. Examples of precision machine parts include, for example, pairing used in precision driving equipment, video recorders, and the like; processing parts such as carbide tips, and the like. Examples of the resin processed parts include precision resin processed parts used for cameras, automobiles, and the like. Further, examples of the optical component include a lens used for a camera, eyeglasses, optical equipment, and the like, and other components include an eyeglass frame, a watch case, a watch belt, and the like.

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 on a printed wiring board in which a flux remains, but the precision parts and jigs to which the present invention is applied are exemplified by these examples. It is not limited to the above, but has a solid surface of a fixed shape with various interfering substances such as processing oil and flux in the assembling process, or various oily contaminants that degrade the characteristics of the product. The cleaning composition of the present invention can be applied to parts and jigs and tools.

Further, when these contaminants are mainly organic oil stains such as oils and fats, machine oils, cutting oils, greases, rosin-based fluxes, etc., the cleaning composition of the present invention is particularly effective. Even dirt mixed with inorganic powder, moisture and 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, an oscillating method, a spray method, a steam cleaning method, a hand-wiping method, and a water displacement drying method, and can obtain favorable results. Can be.

When the cleaning agent of the present invention is used in a step of cleaning a printed circuit board to which a flux is attached, for example, first, ultrasonic cleaning is performed in an ultrasonic cleaning tank containing the cleaning composition of the present invention, and then the cleaning composition of the present invention. By immersion cleaning in a liquid bath filled with water, and finally performing steam cleaning with the cleaning composition of the present invention, cleaning can be performed efficiently.

〔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 10 and Comparative Examples 1 to 5 A 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 performance when contamination is caused, a cleaning solution containing the above naphthenic mineral oil in an amount of 20% by weight (Example 3, Example 8,
Comparative Examples 2 and 5) were prepared and subjected to the same washing test. Table 1 shows the results.

Further, to check the deterioration resistance of the cleaning solution, 100 ml of each of paramenthan, diisopropylcyclohexane, dodecylbenzene, kerosene and limonene was placed in a 300 ml glass container, and 10 g of each of copper powder and iron powder was added thereto. For 5 days in a high temperature bath. Dodecylbenzene, limonene, and kerosene having an unsaturated bonding group were thickened due to thermal degradation, but no change was observed in the saturated cyclic hydrocarbons such as paramenthane and diisopropylhexane.

(Evaluation criteria) Detergency ◎: Extremely clean surface ○: Almost no mineral oil residue on the surface △: Minor oil residue slightly on the surface ×: Mineral oil residue on the surface Examples 11 to 19 and Comparative Examples 6 and 7 A printed wiring board on which an IC chip was mounted was subjected to a flux treatment, followed by a solder treatment to obtain a test piece. 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. Table 2 shows the results.

(Evaluation Criteria) ：: Very good without flux residue.

：: good with little residual flux

Δ: slight residual flux, slightly poor

×: Flux remains and is poor.

[Effects of the Invention] As described above, the detergent composition of the present invention has excellent detergency, deterioration resistance, safety, and no concern for environmental pollution. It can be used effectively as a cleaning agent for jigs and tools used.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication // H05K 3/26 7511-4E H05K 3/26 (C11D 7/50 7:24) (C11D 10 / 02 1:66)

Claims (3)

(57) [Claims] 1. A detergent composition comprising at least 70% by weight of a cyclic saturated hydrocarbon having 9 to 18 carbon atoms. 2. The cleaning composition according to claim 1, further comprising 0.1 to 30% by weight of an aliphatic alcohol having 6 to 18 carbon atoms and / or a surfactant. 3. The cleaning composition according to claim 2, wherein the surfactant is a nonionic surfactant of HLB 4-15.