JPH05140593A - Detergent composition for precision part - Google Patents

Abstract

PURPOSE:To provide a detergent having excellent removability of stains such as fats and oils, machine oils, greases, and fluxes, substantially not deteriorated by the stain components, having low toxicity, and used for mechanical.electronical.electrical parts. CONSTITUTION:The objective detergent composition for precision parts contains a hydrogenated olefin oligomer as a main component. For example, a detergent composition comprising 70-99.9wt.% of the hydrogenated olefin oligomer, 0.1-30wt.% of a compound selected from a 3-18C alcohol, ester, ether, surfactant, aprotic polar solvent, etc., and preferably further 0.001-5wt.% of water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to precision parts such as machinery and equipment.
Excellent in removing dirt such as grease, machine oil, grease, flux, etc. on the solid surface of cleaning composition for electronic / electrical parts, more specifically precision parts or jigs / tools used in the assembly process. The present invention also relates to a cleaning agent for precision parts, such as mechanical / electronic / electrical parts, which is less likely to be deteriorated by such dirt components and has low toxicity.

[0002]

2. Description of the Related Art Conventionally, kerosene and benzene have been used to remove rosin flux from organic substances such as oil present on the solid surface of precision parts, jigs and tools as rust preventive oil and processing oil, or solder rosin flux. , Aromatic hydrocarbon solvents such as xylene; Chlorine solvents such as trichloroethylene, tetrachloroethylene, and trichloroethane; Freon solvents such as trichlorotrifluoroethane; Water-based detergents containing sodium orthosilicate or caustic soda with a surfactant or builder. Are used. In particular, Freon solvents or chlorine solvents are used for precision parts such as electronics, electricity and machinery due to their high cleaning property and flame retardancy.

In recent years, terpenes such as limonene, pinene, diterpene and the like derived from natural products have been proposed as detergents with little environmental pollution and high safety. On the other hand, regarding washing of clothes, for example, petroleum-based solvents are sometimes used for dry cleaning, but stains on clothes are
It is considered that substances mainly consisting of proteins, lipids, etc. are the causative substances, and are different from stains on mechanical, electronic and electric parts.

[0004]

None of these conventional detergents satisfies all of the conditions required for detergent compositions such as stain removability, deterioration resistance and low toxicity. That is, cleaning agents using chlorine-based and freon-based solvents have major problems in safety, toxicity, environmental pollution, etc. For example, hydrocarbon solvents such as benzene and xylene are highly toxic, and the Occupational Safety Law Since it is a compound designated as a harmful substance above, it is not preferable to use it as a detergent in consideration of the danger and complexity of the work of handling these.

On the other hand, the water-based cleaning agent is preferable in that it is less dangerous and less toxic than the solvent-based cleaning agent, but it has a deteriorating detergency and has a problem of rusting. In addition, special wastewater treatment equipment is required. Also, terpenes typified by limonene are compounds that can achieve both safety and detergency, but not only are they easily deteriorate during use and durability is a problem, but stable quality products are derived from natural products. It is difficult to obtain, expensive, and has a limited supply amount, so it is not practical as an industrial cleaning agent.

Therefore, the present invention improves the above-mentioned drawbacks of the prior art, and removes stains such as grease, grease, flux, etc. existing on the solid surface of precision parts or jigs and tools used for assembling them. It is an object of the present invention to provide a cleaning composition which is excellent in removability, deterioration resistance and safety and which does not pollute the environment at low cost.

[0007]

Under these circumstances, the inventors of the present invention have conducted extensive studies to solve the above-mentioned problems, and as a result, olefins such as isobutylene, butene-1, butene-2, etc., alone or in combination of two kinds. The hydrogenated olefin oligomer obtained by polymerizing as described above and then hydrogenating is 70 to 9
It was found that a detergent composition containing 9.9% by weight or more can be used as a detergent composition satisfying the above conditions, and the present invention has been completed.

[0008] The invention of claim 1 of the present invention is a cleaning composition for precision parts, which mainly contains a hydrogenated olefin oligomer.

According to a second aspect of the present invention, the hydrogenated olefin oligomer is 70 to 99.9% by weight and the carbon number is 3 to 1.
8 alcohols, esters, ethers, general formula R-OC
Any one selected from a compound represented by _n H _2n OH (R is an aliphatic hydrocarbon residue having 3 to 18 carbon atoms, n is an integer of 1 to 4), a surfactant, and an aprotic polar solvent. The cleaning composition according to claim 1, which contains 0.1 to 30% by weight of the seed compound.

According to the third aspect of the present invention, water is added in an amount of 0.00
The cleaning composition according to claim 2, wherein 1 to 5% by weight is added.

The present invention will be described in more detail below. The hydrogenated polyolefin oligomer of the present invention is C
Olefin of 10 or less, preferably an oligomer obtained by polymerizing or copolymerizing butenes such as propylene, i-butene, 1-butene, and 2-butene alone, wherein unsaturated bonds are substantially hydrogenated. It has been made to disappear. Particularly preferred is a hydrogenated butene oligomer in terms of detergency and odor. The above olefins can be used alone or in combination as C10 or less olefins for polymerization, and a wide range of petroleum fractions from light oil fractions to petroleum atmospheric residue are contacted for the production of high octane gasoline and LPG. C3 including propylene produced as a by-product from the catalytic cracking process
Includes residual i-butene, 1-butene, 2-butene, etc. obtained by removing butadiene from a C4 fraction produced as a by-product during the thermal decomposition of petroleum hydrocarbons such as naphtha for producing ethylene or propylene. The spent fraction can be used as a polymerization raw material.

The polymerization can be carried out by using a Friedel-Crafts catalyst such as phosphoric acid, hydrogen fluoride, aluminum chloride or the like, silica / alumina or the like. For example, when the spent fraction is polymerized, the polymerization temperature is 5 to 130 ° C. and the pressure is 1 to 22.
It is carried out under the conditions in the range of Kg / cm ² .

The hydrogenation is carried out in order to eliminate unsaturated bonds which adversely affect the cleaning performance such as oxidation resistance, and this is carried out according to a conventional method, for example, by hydrogenation under pressure of hydrogen with a metal catalyst such as nickel or palladium. It is done by If the unsaturated bond is substantially eliminated, there is no particular inconvenience, and the unsaturated bond may remain as long as it does not affect the cleaning agent performance such as oxidation resistance.

The number average molecular weight of the hydrogenated olefin oligomer of the present invention is 100 to 2500, preferably 100 to 50.
It is 0. An oligomer having a number average molecular weight exceeding this range is not preferable because it has a high boiling point and a high viscosity, and the cleaning ability is lowered.

The above hydrogenated olefin oligomer is
Although it can be used as a cleaning agent for precision parts such as mechanical / electronic / electrical parts by itself, preferred embodiments further include aliphatic alcohols, esters, ethers, and general formula R-
A detergent represented by OC _n H _2n OH (R is an aliphatic hydrocarbon having 3 to 18 carbon atoms, n is a positive number of 1 to 4) or a combination of surfactants or a combination thereof. By using the composition, the cleaning effect can be further increased.

Here, as the aliphatic alcohol, an alcohol having 3 to 18 carbon atoms is used. For example, propanol, butanol, pentanol, t-butanol, hexyl alcohol, octyl alcohol, lauryl alcohol, oleyl alcohol, glycerin, glycol. ,
Examples include various natural and synthetic alcohols such as Guerbet alcohol and alcohol synthesized by the oxo method.

As the ester, an ester having a carbon number of 18 or less is used, and specifically, propyl acetate, butyl acetate,
Examples include pentyl acetate, hexyl acetate, ethyl propionate, propyl propionate, butyl propionate, pentyl propionate, hexyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, and hexyl butyrate.

As the ether, an ether having a carbon number of 18 or less is also used, and specifically, dimethyl ether, diethyl ether, dipropyl ether, dibutyl ether, dipentyl ether, methyl ethyl ether, methyl propyl ether, methyl pentyl ether, ethyl propyl. There are ether, ethyl butyl ether, ethyl pentyl ether, propyl butyl ether, propyl pentyl ether, butyl pentyl ether, glycerin methyl ether and the like.

Specific examples of the compound represented by the general formula R-OC _n H _2n OH (R is an aliphatic hydrocarbon having 3 to 18 carbon atoms, and n is a positive number of 1 to 4) include hydroxydimethyl ether and hydroxy. Methyl ethyl ether, hydroxymethyl propyl ether, hydroxymethyl isopropyl ether, hydroxymethyl butyl ether, hydroxymethyl pentyl ether, methyl cellosolve, ethyl cellosolve, propyl cellosolve, butyl cellosolve, pentyl cellosolve, 3-hydroxypropyl methyl ether, 3-hydroxypropyl ethyl ether ,
There are 3-hydroxydipropyl ether, 3-hydroxypropyl isopropyl ether, 3-hydroxypropyl butyl ether, 4-hydroxybutyl methyl ether, 4-hydroxybutyl ethyl ether and the like.

These are produced, for example, by adding ethylene oxide or propylene oxide to an aliphatic alcohol having 3 to 18 carbon atoms such as propanol or butanol. A preferred compound is a compound produced by adding propylene oxide.

As the surface active agent, any of anionic surface active agents, cationic surface active agents, zwitterionic surface active agents, etc. can be used, but nonionic materials are used in view of less rusting of the article to be cleaned. The system surfactant is the best. For example, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenol ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene allyl phenol ether, polyoxyalkylene sorbitan fatty acid ether, polyoxyl alkylene alkyl amine, sorbitan acid fatty acid ester, polyoxyalkylene, etc. preferable. Here, the polyoxyalkylene is preferably a polymer of ethylene oxide, propylene oxide or butylene oxide. Among the above surfactants, nonionic surfactants having an average HLB of 4 to 15 exhibit particularly excellent effects for cleaning mechanical, electronic and electric parts.

Examples of the aprotic polar solvent include sulfolane and propyl carbonate.

[0023] These aliphatic alcohols, esters, ethers, general formula _{R-OC n H 2n OH (} R is a carbon number 3 to 1
8 aliphatic hydrocarbon, n represents a positive number of 1 to 4), a surfactant, and an aprotic polar solvent are added in the total amount with respect to the detergent composition. 0.
The amount is preferably in the range of 01 to 30% by weight, more preferably 0.1 to 20% by weight. If it is less than 0.01% by weight, the effect of adding it is difficult to obtain, and if it exceeds 30% by weight, surfactants and the like remain on the cleaned surface, which may affect the characteristics of the cleaned parts. is there.

In the present invention, it is preferable to mix water with the hydrogenated olefin oligomer to the extent that phase separation does not occur. If the amount of water is less than 0.001% by weight, the effect of adding water will not be obtained, and if it exceeds 5% by weight, rust will occur, so 0.001 to 5% by weight, more preferably 0.01 ~ 2% by weight is preferred.

Further, the cleaning composition of the present invention may further contain various alcohols such as ethanol, organic acids such as citric acid, tartaric acid and phthalic acid, preservatives and rust preventives, as long as the effects thereof are not impaired. Agents, defoaming agents, antioxidants, cleaning enzymes and the like may be added.

The cleaning composition of the present invention has a particularly excellent effect on cleaning precision parts and jigs and tools used in the assembly 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, as the electronic parts, for example, a computer and its peripheral devices, home electric appliances, communication devices, O
Printed power distribution boards used for A equipment and other electronic application equipment; Hoop materials used for contact members such as IC lead frames, resistors, capacitors, relays; used for OA equipment, watches, computer equipment, toys, home appliances, etc. Liquid crystal display; Magnetic recording parts used for video / audio recording / reproducing parts and related parts; Semiconductor parts / materials such as silicon and ceramic wafers; Electrostrictive parts such as hydrogen oscillators; CD, PD, Examples include optical conversion components such as copying equipment and optical recording equipment.

Examples of the electric parts include electric motor parts such as brushes, rotors, stators, housings, and currency inspection parts used in vending machines and various devices. Examples of precision machine parts include bearings used in precision drive equipment, video recorders and the like; processed products such as super-hardened chips. As resin processed parts,
Examples thereof include precision resin processed parts used in cameras, automobiles and the like. Further, the optical components include cameras, spectacles, lenses used in optical devices, and other components include spectacle frames, watch cases, watch belts and the like.

In the present invention, the jigs and tools used in the assembling process are jigs that handle the precision parts as shown in the above-mentioned examples of each part in various processes such as manufacturing, molding, processing, assembling and finishing. , Tools, and various devices that handle these precision parts, and their parts.

The cleaning composition of the present invention is especially
Although it exerts a suitable ability for cleaning the printed wiring board and bearings where the flux remains, the precision parts and jigs and tools targeted by the present invention are not limited to the above-mentioned examples, and they are used in the assembly process. Various processing oils such as anti-corrosion oil, substances that interfere with post-processes such as flux,
Alternatively, the cleaning composition of the present invention can be applied to precision parts and jigs having a solid surface of a certain shape to which various oily pollutants that deteriorate the properties of products are attached.

Furthermore, these contaminants are, for example, fats and oils,
In the case of mainly organic oil such as machine oil, cutting oil, grease, and flux, the cleaning composition of the present invention is particularly effective, and even if the metal powder or water is mixed, the cleaning composition can be sufficiently cleaned and removed. can do.

The cleaning composition of the present invention can be used in various cleaning methods such as a dipping method, an ultrasonic cleaning method, a vibration method, a spray method, a steam cleaning method and a hand-wiping method, and a preferable result can be obtained. ..

When the cleaning agent of the present invention is used in the step of cleaning a printed circuit board to which flux has adhered, for example, first, ultrasonic cleaning is performed with an ultrasonic cleaning layer containing the cleaning composition of the present invention, and then the cleaning agent of the present invention is used. This can be effectively performed by continuously performing a method such as immersion cleaning in a liquid bath filled with the cleaning composition and finally shower cleaning or steam cleaning with the cleaning composition of the present invention. After cleaning the precision parts using the cleaning composition of the present invention as described above, if necessary, post-cleaning (rinsing) may be performed using the hydrogenated olefin oligomer used in the cleaning composition of the present invention. Good. After this, cleaning is also performed by the immersion method, ultrasonic cleaning method, vibration method, spray method,
It can be performed by various methods such as a steam cleaning method and a hand-wiping method.

[0033]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these. (Production Example) 1) Production of butene oligomer (polymer of C4 fraction) In a 500 ml continuous autoclave made of stainless steel
-Add 400 ml of butane. Next, a spent fraction consisting of isobutene, butene-1, butene-2 and n-butane 40% is continuously introduced at 500 ml / H. At the same time, aluminum chloride was continuously added at 5 g / H and the temperature was kept at 120 ° C. After the reaction is complete, add water 5 to the autoclave.
00 ml was added to deactivate aluminum chloride to obtain a butene oligomer having a number average molecular weight of about 240.

2) Production of hydrogenated butene oligomer 100 g of the above butene oligomer was dissolved in n-hexane, put in a 1 l autoclave, nickel for catalyst was added, and the air in the autoclave was replaced with hydrogen to give 20 kg / c.
The pressure was m ² . The mixture was reacted at 200 ° C. for 4 hours with stirring. After cooling, the pressure was released and nickel was filtered. Further, n-hexane was removed.

(Examples 1 to 17, Comparative Examples 1 to 7) 30 mm
A mineral oil-based rust preventive waste oil for precision machine parts was applied to a glass plate of 70 mm at a rate of 500 mg / m ² . This glass plate was immersed in a cleaning solution containing hydrogenated butene oligomers maintained at 40 ° C. (the composition of each cleaning solution is shown in the table), cleaned with an ultrasonic wave of 28 KHz for 2 minutes, and the cleaning property was visually evaluated. The results are summarized in Table 1. Each of the comparative examples was washed with the washing solvent shown in Table 2 in the same manner as in Examples, and the results are shown in Table 2.

[0036]

[Table 1]

[0037]

[Table 2]

Further, washing was repeated with the same washing solution, but no deterioration of the washing solution was observed. Detergency evaluation was shown according to the following criteria. ◎: Extremely clean surface ○: Almost no residual oil △: Slight residual oil ×: Large residual oil

[0039]

INDUSTRIAL APPLICABILITY As described above, the cleaning composition of the present invention has excellent detergency and resistance to deterioration, is highly safe and does not cause environmental pollution. It can be advantageously used as a cleaning agent for used jigs and tools.

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Claims (3)

[Claims] 1. A cleaning composition for precision parts, which mainly contains a hydrogenated olefin oligomer. 2. 70 to 9 hydrogenated olefin oligomer
9.9 wt%, the alcohol having 3 to 18 carbon atoms, esters, ethers, general formula _{R-OC n H 2n OH (} R is an aliphatic hydrocarbon residue having 3 to 18 carbon atoms, n represents an integer of 1 to 4 A compound represented by the formula (1), a surfactant, and 0.1 to 3 of any one compound selected from aprotic polar solvents.
The cleaning composition according to claim 1, containing 0% by weight. 3. The cleaning composition according to claim 2, wherein 0.001 to 5% by weight of water is added.