JPH07150195A - Detergent - Google Patents

Abstract

PURPOSE:To obtain a detergent which, is free from the problem of toxicity and excellent in detergency, facilitates waste water treatment, and has a high flash point and no possibility of causing the ozonosphere depletion. CONSTITUTION:The detergent consists of 70-95wt.% glycol ether compound represented by the formula (wherein one of R<1> and R<2> is H, and the other is methyl; and n is an integer of 1 to 3) and 5-30wt.% glycol ether compound represented by the formula R<3>O(CpH2pO)qH (wherein R<3> is 1-5C alkyl; p is an integer of 3 to 4; and q is an integer of 1 to 3).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dirty solid surface, particularly processing oils and waxes used for processing precision machine parts, optical machine parts, etc., and fluxes and solders used for soldering electric and electronic parts. The present invention relates to a cleaning agent suitable for removing paste.

[0002]

2. Description of the Related Art Various processing oils, such as cutting oil, press oil, drawing oil, heat treatment oil, rust preventive oil, wax, lubricating oil, grease, etc., are used when processing precision machine parts, optical machine parts, etc. However, these oils and fats need to be finally removed. Also, as a method of joining electronic circuits, soldering is most commonly used, but for the purpose of removing and cleaning oxides on the metal surface to be soldered, preventing reoxidation, improving the wettability of solder, etc. It is common practice to pretreat the soldering surface with a flux containing rosin as a main component. As a method of soldering, a method of supplying the molten solder after supplying the flux to the surface of the board by dipping the board in a solution-like flux, or a method of mixing the flux and solder powder in advance to form a paste There is a method of heating after supplying it to the place to be soldered, but in any case flux residue causes corrosion of the metal and deterioration of insulation, so it is necessary to remove it sufficiently after soldering is completed. is there.

[0003] These cleaning and removal have many characteristics such as nonflammability, low toxicity, and excellent solubility. Therefore, 1,1,2-trichloro-1,2,2-trifluoro is used. Ethane and 1,1,1-trichloroethane have been widely used. However, these are extremely excellent as cleaning agents, but because they are chemically stable, they reach the stratosphere, where they are decomposed by strong ultraviolet rays and chlorine is generated, which destroys the ozone layer and reaches the ground. In recent years, it has been pointed out that increasing the amount of UV rays has a serious impact on the earth's ecosystems including humankind, and there has been an international agreement to regulate their production and consumption, and to abolish them in the near future.

Under these circumstances, expectations are high for a non-halogen alternative cleaning agent that is safe and has little impact on the environment, but at present it is not possible to obtain a cleaning agent that fully satisfies the required performance. . For example, US Pat. No. 4,51
Although terpenes such as limonene have been proposed in Japanese Patent No. 1,488, etc., these have a low flash point and pose a safety problem.

Various glycol ether compounds have been proposed in JP-A-59-134891, JP-A-3-62895, JP-A-3-162496 and JP-A-3-97792. However, it is the present situation that a material satisfying all required performances such as detergency, wastewater treatment property and toxicity has not been developed yet. The ethylene glycol-based compound has a problem of toxicity and is generally inferior in detergency to the propylene glycol-based compound.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a cleaning agent having no toxicity problem, excellent detergency, easy drainage treatment, high flash point and no danger of depletion of ozone layer. Is.

[0007]

That is, the present invention is
A detergent comprising (a) 70 to 95% by weight of a glycol ether compound represented by the following general formula (1) and (b) 5 to 30% by weight of a glycol ether compound represented by the general formula (2). is there.

[0008]

[Chemical 2] ^{_{R 3 O (C p H 2p}} O) q H (2) ( wherein, R ³ represents an alkyl group having 1 to 5 carbon atoms, p is 3-4 integer, q is an integer of 1 to 3 The glycol ether compound represented by the general formula (1) of the present invention may be a mixture of isomers in which R ¹ and R ^{2 are} exchanged.

Specific examples of the glycol ether compound represented by the general formula (1) of the present invention include propylene glycol monocyclohexyl ether, dipropylene glycol monocyclohexyl ether, and tripropylene glycol monocyclohexyl ether. Propylene glycol Monocyclohexyl ether is particularly preferred.

The glycol ether compound represented by the general formula (2) of the present invention is a monoalkyl ether of mono-, di-, or tripropylene glycol or butylene glycol, and the alkyl group is methyl, ethyl or propyl. , Isopropyl, butyl, t-butyl, pentyl, cyclopentyl, etc. are particularly preferable, and dipropylene glycol monoalkyl ether is particularly preferable, and the alkyl group is methyl, ethyl, propyl, isopropyl.

Water can be added to the detergent of the present invention for the purpose of increasing or eliminating the flash point. The amount of water added is preferably 3 to 20 parts by weight with respect to 100 parts by weight of (a) + (b), and when less than 3 parts by weight, the effect is small, and 2
If it exceeds 0 parts by weight, the detergency is lowered, which is not preferable. The glycol ether-based compound represented by the general formula (2) of the present invention requires 5% by weight or more to keep the added water uniform in the operating temperature range, but when it exceeds 30% by weight,
It is not preferable because the detergency is lowered, and the amount of the detergent component eluted into water is increased during the water rinse after washing, which imposes a heavy burden on wastewater treatment.

The detergent of the present invention may contain (d) amine for the purpose of further enhancing the detergency. Suitable amines include, for example, monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N-butyldiethanolamine, N-methyldiethanolamine, N-butyldiethanolamine,
N, N-dimethylethanolamine, N, N-diethylethanolamine, N, N-dibutylethanolamine, N- (β-aminoethyl) ethanolamine, diethylenetriamine, morpholine, piperazine, cyclohexylamine and the like are particularly preferable. As a thing
Examples include monoethanolamine, diethanolamine and triethanolamine.

The amount of addition is preferably 1 to 15 parts by weight of (d) amine with respect to 100 parts by weight of (a) + (b). If the amount is 15 parts by weight or less, the purpose can be sufficiently achieved. The cleaning agent of the present invention generally has a high-boiling point composition and may cause a problem of drying the object to be washed.In such a case, the cleaning agent remaining on the object to be washed after cleaning is rinsed with water. , Replace,
A surfactant can be added to the detergent composition of the present invention for the purpose of facilitating the drying.

As the surfactant, known anion, cation or nonionic surfactants can be used. Examples thereof include, but are not limited to, alkylbenzene sulfonate, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene-polyoxypropylene alkyl ether, and the like. If necessary, known rust preventives and antioxidants such as benzotriazoles, nitrites, phosphites, and phenols can be added to the detergent of the present invention.

[0015]

[Example] The evaluation method is as follows. Uniformity of the cleaning liquid, heating each cleaning agent to 60 ℃, observe the state of the liquid,
The uniform and transparent one was marked with ◯, and the two-phase separated one was marked with x. The flux cleanability was obtained by immersing a glass epoxy printed circuit board (46 x 70 x 1.6 mm) in flux (AGF-200J-1 manufactured by Asahi Kaken), pulling it up, and air drying at room temperature in a solder bath at 250 ° C. It was contacted for 3 seconds and soldered. This was immersed in each cleaning agent heated to 60 ° C., rocking and cleaning for 2 minutes, rinsed with pure water, and dried with a dryer. The degree of cleaning was evaluated by the amount of ionic residue (μg · NaCL / in ² ) measured with an Omega meter manufactured by Alpha Metal. ○: 5 or less,
Δ: 5 to 10, ×: 10 or more.

Degreasing and detergency is 30 cm in width 2 cm and length 5 cm.
Dip a mesh stainless steel wire mesh in press oil (Unipres DP-120, manufactured by Nippon Petrochemical Co., Ltd.) to about 0.5.
After applying g of press oil, 100 ml of each cleaning agent
Ultrasonic cleaning was performed in the medium at 40 ° C. for 1 minute. The residual oil was extracted with carbon tetrachloride, and the degreasing rate was calculated with an oil concentration meter. ◯: Degreasing rate 99% or more, Δ: Degreasing rate 99 to 90%, ×: Degreasing rate 9
It was set to 0% or less.

The flash point was measured by the Cleveland open type of JIS K2265. Wastewater treatment is performed by mixing each detergent with water in a ratio of 1: 1 (weight), shaking it well at 60 ° C, and then leaving it to stand and separating the separated aqueous phase by gas chromatography to analyze the total amount of organic substances eluted. I asked.

[0018]

Examples 1 to 5 and Comparative Examples 1 and 2 Evaluation of cleaning liquid uniformity, flux cleaning property, degreasing cleaning property, flash point, and wastewater treatment property of the cleaning agents shown in Table 1 at the cleaning temperature (60 ° C). Was done. All of Examples 1 to 5 were uniform liquids at 60 ° C. and were excellent in cleaning property and waste water treatment property. Comparative Example 1 does not contain the glycol ether compound represented by the general formula (2), but the liquid became cloudy at 60 ° C. and phase separation occurred. In Comparative Example 2, 50% of DPM was added as a glycol ether compound, but the flux detergency was deteriorated, and it was mixed with water at a ratio of 1: 1 (weight) and shaken well at 60 ° C. After that, phase separation did not occur even if left still.

[0019]

[Table 1]

[0020]

The cleaning agent of the present invention has excellent detergency, low toxicity, and substantially satisfactory flash point. Moreover, since it does not contain a halogen atom and there is no danger of depleting the ozone layer, it is extremely useful as a substitute cleaning agent for 1,1,2-trichloro-1,2,2-trifluoroethane and 1,1,1-trichloroethane. Is. In particular, the cleaning agent of the present invention is suitable for cleaning solder flux, solder paste, and wax and processing oils.

Claims (1)

[Claims] 1. 70 to 95% by weight of a glycol ether compound represented by the following general formula (1) and (b) a glycol ether compound 5 represented by the following general formula (2):
Cleaning agent consisting of 30% by weight. [Chemical 1] ^{_{R 3 O (C p H 2p}} O) q H (2) ( wherein, R ³ represents an alkyl group having 1 to 5 carbon atoms, p is 3-4 integer, q is an integer of 1 to 3 )