JPH0362896A - Detergent composition - Google Patents

Abstract

PURPOSE:To obtain a detergent composition, containing a specific amount of a specified cyclic saturated hydrocarbon, excellent in removing properties of foulings, such as fats and oils, machine oils, greases or rosin-based fluxes, with hardly any deterioration by the aforementioned fouling components and having low toxicity. CONSTITUTION:The objective composition containing (A) >=70wt.% 9-18C (preferably 10-15C) cyclic saturated hydrocarbon and, as necessary, (B) 0.1-30wt.% of (i) a 6-18C aliphatic alcohol and/or (ii) a nonionic surfactant having preferably 4-15 HLB. Furthermore, hydrogenated substances, such as p-menthane, pinane, diisopropylcyclohexane, butylcyclohexane, dodecylcyclohexane, naphthalene and diphenylmethane, are cited as preferred examples of the component (A).

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 that has excellent removability for stains such as , grease, rosin-based flux, etc., is resistant to deterioration by such stain components, and has low toxicity.

[Conventional technology]

Conventionally, to remove stains mainly composed of organic substances such as oil that exist on the solid surfaces of precision parts, jigs, etc., hydrocarbon solvents such as kerosene, benzene, and xylene; chlorine solvents such as trichlorethylene and tetrachlorethylene; Freon-based solvents such as trifluoroethane; water-based cleaning agents containing sodium orthosilicate or caustic soda mixed with surfactants and builders are used. In particular, fluorocarbon-based solvents or chlorinated solvents are used for electronic, electrical, mechanical, and other parts because of their high cleaning properties and flame-retardant properties.

In addition, in recent years, U.S. Patent No. 4.511.488, U.S. Pat. No. 4.640.719, U.S. Pat.
Terpenes such as limonene, pinene, and dipentene, as seen in the specification of the above patent, have also been proposed.

[Problem to be solved by the invention]

However, none of these detergents has been able to satisfy all of the conditions required for a detergent composition, such as stain removal properties, deterioration resistance, and low toxicity. In other words, cleaning agents that use chlorine-based and fluorocarbon-based solvents are
There are major problems with safety, toxicity, and environmental pollution, and hydrocarbon solvents, especially benzene and xylene, are highly toxic compounds and are designated as hazardous substances under the Industrial Safety and Health Act. Therefore, when considering the danger and complexity of handling them, it is not preferable to use them as cleaning agents. 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. In addition, terpenes such as limonene are compounds that are both safe and easy to clean, but they tend to deteriorate during use and have problems with durability. It is difficult to obtain, expensive, and has a limited supply, making it impractical as an industrial cleaning agent.

Therefore, the present invention improves the drawbacks of the prior art as described above, and eliminates oil, machine oil, grease, etc. present on the solid surface of precision parts or jigs and tools used in the assembly process thereof.
The object of the present invention is to provide a cleaning composition that has excellent removability of stains such as rosin flux, deterioration resistance, and safety, and is free from environmental pollution.

[Means to solve the problem]

Under these circumstances, the present inventors have conducted intensive research to solve the above problems, and have found that cyclic saturated hydrocarbons having a specific carbon number range can be used as a cleaning composition that satisfies the above conditions. The present invention was completed based on this discovery.

That is, the present invention provides a cleaning 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. Although cleaning performance can be improved to some extent by selecting a cyclic hydrocarbon having an unsaturated alkyl bond with an appropriate number of carbon atoms, it is unsuitable because it deteriorates significantly during use. Also, its carbon number is 9
~18, particularly preferably 10-15 carbon atoms; if it deviates from this range, the cyclic saturated hydrocarbon will easily evaporate and catch fire during cleaning, resulting in poor safety. Moreover, a good cleaning effect cannot be obtained.

Such cyclic saturated hydrocarbons include hydrogenated terpenes and aromatic compounds, and specific examples include paramencune, pinane, diisopropylcyclohexane, butylcyclohexane, dodecylcyclohexane, naphthalene, and diphenylmethane. Examples include hydrogenated substances.

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 sustainability.

The cleaning composition of the present invention can further increase its effectiveness by containing an aliphatic alcohol and a surfactant alone or in combination.

As the aliphatic alcohol, aliphatic alcohols having 6 to 18 carbon atoms are used, such as natural and synthetic alcohols such as hexyl alcohol, octyl alcohol, lauryl alcohol, oleyl alcohol, Guerbet alcohol, and alcohol synthesized by the oxo method. Examples include various alcohols.

In addition, as a surfactant, any of anionic surfactants, cationic surfactants, amphoteric surfactants, etc. can be used, but nonionic surfactants are preferable because they have less effect on the cleaning surface. Best.

For example, polyoxyalkylene alkyl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene allylphenol ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkylamine, sorbitan fatty acid ester, polyoxyalkylene, etc. are preferable. Among them, the average HL is 84~
No. 15 nonionic surfactants exhibit particularly excellent effects. Here, the polyoxyalkylene is preferably a polymer of ethylene oxide, propylene oxide or butylene oxide.

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

In addition, the cleaning composition of the present invention may optionally contain various alcohols such as ethanol and glycol, organic acids such as citric acid, tartaric acid, and phthalic acid, rust preventives, and preservatives, as long as they do not impair their effectiveness. , an antifoaming agent, an antioxidant, etc. may be added.

The cleaning composition of the present invention has particularly excellent effects on cleaning precision parts and jigs and tools used in the assembly process thereof.

In the present invention, precision components include, for example, electronic components, electrical machinery components, precision mechanical components, resin processed components, optical components, and the like.

Here, electronic components include, for example, printed wiring boards, IC lead frames, resistors, capacitors, relays, and other contacts used in computers and their peripheral equipment, home appliances, communication equipment, ○A equipment, and other electronic application equipment. Hoop materials used for parts; Liquid crystal displays used in ○A equipment, watches, computer equipment, toys, home appliances, etc.; Magnetic recording parts used in video/audio recording/playback parts, related parts, etc.; silicon and ceramics Semiconductor materials such as wafers; electrostrictive parts such as crystal resonators; photoelectric conversion parts used in CDs, PDs, copying equipment, optical recording equipment, etc. Examples of electrical parts include electric motor parts such as brushes, rotors, stators, and housings; ticket issuing parts used in vending machines and various devices; and coin inspection parts used in vending machines, cash dispensers, and the like. Examples of precision mechanical parts include bearings used in precision drive equipment, video recorders, etc.; processing parts such as carbide tips; and the like. Examples of resin-processed parts include precision resin-processed parts used in cameras, automobiles, and the like. Further, examples of optical parts include lenses used in cameras, glasses, optical instruments, etc., and examples of other parts include glasses frames, watch cases, watch straps, etc.

In the present invention, the jigs and tools used in the assembly process include precision parts such as those shown in the various parts examples above.
Refers to jigs and tools used in various processes such as molding, 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; Precision products with a solid surface of a certain shape are adhered to, but are not limited to, various substances that interfere with subsequent processes such as various processing oils and fluxes during the assembly process, or various oil-based contaminants that degrade the characteristics of the product. The cleaning composition of the present invention can be applied to parts and tools.

Further, 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 inorganic powder, moisture, etc. can be sufficiently washed and removed.

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

When the cleaning agent of the present invention is used in the process of cleaning a printed circuit 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, and then the cleaning agent composition of the present invention is used for ultrasonic cleaning. Cleaning can be efficiently carried out by continuously performing a method such as immersion cleaning in a liquid bath filled with water and finally steam cleaning with the cleaning composition of the present invention.

〔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 IO and Comparative Examples ■ to 5 70 mm
Naphthenic mineral oil (40°C, 35°C) at a rate of 00mg/m'
Apply 0cst). This test piece was heated at 40°C.
The sample was immersed in a cleaning solution maintained at 0°C and cleaned using ultrasonic waves for 5 minutes.

After washing, the washability was visually evaluated.

In addition, in order to investigate the cleaning performance when dirt is mixed, cleaning liquids (Example 3, Example 8, Comparative Example 2, Comparative Example 5) containing 20% by weight of the above naphthenic mineral oil were prepared, and similar cleaning tests were conducted. Ta. These results are shown in Table 1.

Furthermore, in order to investigate the deterioration resistance of the cleaning solution, we
Diisopropylcyclohegyusan, dodecylbenzene, kerosene and limonene each 100mj! 300m each
Place 10g each of copper powder and iron powder in a 1-liter glass container.
After the addition, it was heated in a high temperature bath at 120°C for 5 days. Dotecylbenzene, limonene, and kerosene, which have unsaturated bond groups, increased in viscosity due to thermal deterioration, but the saturated cyclic hydrocarbons paramencune and diisopropylhexane showed no change in δ.
I couldn't bear it.

The following margins ■ ■ (Evaluation criteria) Cleanability ◎: ○: △: ×: Surface extremely clean There is almost no mineral oil residue on the surface. There is a slight mineral oil residue on the surface. There is mineral oil residue on the surface. Below margins Example 11 -19 and Comparative Examples 6-7 Printed wiring boards equipped with IC chips were subjected to flux treatment, and then soldered to prepare test pieces. This test piece was immersed in a cleaning solution maintained at 80° C., and after 5 minutes of ultrasonic cleaning, the removability of flux from the printed wiring board was visually evaluated. The results are shown in Table 2.

(Evaluation criteria) ◎: Very good with no flux residue.

○: Good with almost no flux remaining.

△: There was a slight amount of flux remaining, and it was bad.

×: Flux remained and was bad.

Below is a margin [Effects of the invention] As shown above, the cleaning composition of the present invention has excellent cleaning properties,
Since it has deterioration resistance, good safety, and no concern about environmental pollution, it can be advantageously used as a cleaning agent for precision parts or jigs and tools used in the assembly process.

that's all

Claims (3)

[Claims] 1. A cleaning composition containing 70% by weight or more 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 with an HLB of 4 to 15.