JP3111092B2 - Washing soap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to
The present invention relates to a cleaning agent for removing oil or the like from a material to which oil or the like has adhered in a manufacturing process or the like, or for removing a flux or the like that is applied in order to increase the bonding strength between a solder and a substrate during solder bonding.

[0002]

2. Description of the Related Art Conventionally, in the processing industry of metal parts such as the machine and automobile industries, various oils such as cutting oil, processing oil, press oil, or oil such as grease or wax are used in the manufacturing process. Many of them are used, and these are attached to various parts (objects to be washed), so that they are appropriately removed by washing. In the electric and electronic industries, a flux is applied in advance in the printed wiring board manufacturing process in order to firmly adhere the solder and the base material. If this flux remains on a printed circuit or a printed wiring board, it may cause poor conductivity or corrosion. Therefore, usually, the flux is appropriately cleaned and removed after soldering. Known techniques for cleaning these include, for example, Japanese Patent Application Laid-Open No. 2-1456.
No. 98, a chlorofluorocarbon solvent containing methyl chloroform and the like disclosed in JP-A-3-97797, or a terpene compound and a specific surfactant described in JP-A-3-13198. A water-based cleaning agent, such as an alkali cleaning, which is obtained by adding an organic salt or a surfactant to water, is also considered.

[0003]

At present, with increasing awareness of social environmental problems, chlorofluorocarbon-based solvents such as chlorofluorocarbon-based solvents such as chlorofluorocarbon 113 and chlorofluorocarbons have been used worldwide as ozone depleting substances. , Because it has been agreed that its manufacture and use will be banned in the near future,
It has become necessary to radically change the cleaning agent using these solvents. In addition, a detergent containing a terpene compound and a specific surfactant has both characteristics of environmental safety and detergency. However, in the same manner as a water-based detergent, the detergent contained in the wastewater after the washing step is used. Has become an important issue. Under such circumstances, there has not yet been found a detergent capable of completely satisfying the required performances such as environmental safety, wastewater treatment properties, cleaning properties, practicality, etc. In the industrial field for cleaning printed wiring boards and the like to which the like has adhered, as soon as possible, a cleaning agent that completely satisfies the required performance has been demanded.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the state of the art as described above, and as a result, have found that hydrocarbons, which are relatively inexpensive solvents that can be stably supplied industrially, have been developed.
When the ester represented by the general formula (1) is used in combination at a certain ratio, the dissolving power for stains is remarkably increased, and further, by using the surfactant represented by the general formula (2), the water is mixed with water. When the emulsion is formed, it can be separated from water in a short time after forming the emulsion, so that the solvent can be easily rinsed (water rinse) from the object to be cleaned,
It has been found that the amount of solvent contained in the wastewater after the washing step is extremely small, and the present invention has been completed.

That is, the present invention relates to (a) a method in which the boiling point is 160 ° C.
20 to 90% by weight of a saturated aliphatic hydrocarbon and / or a saturated alicyclic hydrocarbon in the range of 280 ° C, (b) 5 to 50% by weight of an ester represented by the general formula (1), and ( c) 5 to 40 surfactants represented by the general formula (2)
It is a cleaning agent characterized by containing by weight. R ₁ COOR ₂ (1) (wherein, R ₁ and R ₂ represent a hydrocarbon group or a hydroxy hydrocarbon group, and the total number of carbon atoms of R ₁ and R ₂ is 3)
~ 18)

[0006]

Embedded image

Hereinafter, the present invention will be described in detail. Among the saturated aliphatic hydrocarbons and saturated alicyclic hydrocarbons having a boiling point in the range of 160 ° C. to 280 ° C. in the cleaning agent of the present invention, the saturated aliphatic hydrocarbons are branched even if they are linear. The saturated alicyclic hydrocarbon may have only a ring or may have a straight or branched hydrocarbon group bonded to the ring. Each of these may be used alone or as a mixture of two or more.

When the boiling point is in the range of 160 ° C. to 280 ° C., there is a low risk of ignition at a normal washing temperature, and an appropriate viscosity as a detergent is maintained. It is. When its boiling point is less than 160 ° C,
The danger of ignition is significantly increased, explosion-proof equipment for preventing the explosion is costly, and furthermore, it is not practical because the use conditions are extremely limited. If the boiling point exceeds 280 ° C., the viscosity as a detergent increases,
In some cases, the removal of the cleaning agent from the object to be washed after cleaning is incomplete, and this case is not practical.

Further, the content of the saturated aliphatic hydrocarbon and the saturated alicyclic hydrocarbon having the same boiling point range is preferably 20 to 90% by weight. If the content is less than 20% by weight, the effect of the cleaning agent due to other components cannot be ignored, and if it exceeds 90% by weight, the removal of dirt may be incomplete, and in any case, it is not practical. Examples of the saturated aliphatic hydrocarbon and the saturated alicyclic hydrocarbon having a boiling point in the range of 160 ° C to 280 ° C include, for example, decane, dodecane, tridecane, tetradecane, pentadecane, menthane, bicyclohexyl, cyclododecane, decalin, , 2,4,4,6,8,8
-Heptamethylnonane, 2,6,10,14-tetramethylpentadecane, and the like. Speaking of trade names, for example, trade name 0 Solvent (manufactured by Nippon Oil Co., Ltd.) L (boiling point: 182.5 ° C. 212 ° C, the boiling point is omitted below),
M (219 ° C to 247 ° C), H (244 ° C to 262 ° C)
° C), trade names Fukkor High Solvent (manufactured by Fujikosan Co., Ltd.) 160 (160 ° C to 202 ° C), 200 (2
02 ° C to 240 ° C), 240 (241 ° C to 268 ° C),
Exoll (Exol Chemical Co., Ltd.) D60
(186 ° C to 216 ° C), D80 (204 ° C to 232)
° C), D100 (235 ° C to 262 ° C) and the like.

The ester represented by the general formula (1) may be used alone or as a mixture of two or more.
₁ and R _2, the total number of carbon atoms of R ₁ and R ₂ 3
A compound having 18 hydrocarbon groups or a hydroxy hydrocarbon group having a total of 3 to 18 carbon atoms is used. Among them, those in which R ₁ and R ₂ are hydrocarbon groups, and the total number of carbon atoms of R ₁ and R ₂ is 8 to 14, R ₁ is a hydroxy hydrocarbon group, and R ₂ is a hydrocarbon group It is more effective and preferable to use a mixture of R ₁ and R ₂ having a total number of carbon atoms of 5 to 10 each alone or in combination of two or more.

When the total number of carbon atoms of R ₁ and R ₂ is less than 3, the water solubility increases, so that the degree of contamination of the water discharged from the cleaning system increases. If it exceeds, the melting point becomes high, and the liquid stability of the detergent deteriorates, which is not preferable. The ester represented by the general formula (1) is used at 5 to 50% by weight. 5% by weight
If the amount is less than this, the effect of dissolving the dirt becomes small, so that the detergency deteriorates. If the amount exceeds 50% by weight, a peculiar odor is emitted, which is not practical.

Examples of the ester represented by the general formula (1) include butyl acetate, isobutyl acetate, pentyl acetate, isopentyl acetate, heptyl acetate, hexyl acetate,
Octyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, decyl acetate, dodecyl acetate, dihydroterpinyl acetate, ceryl acetate, butylcyclohexyl acetate, ethyl propionate, butyl propionate, isopentyl propionate, methyl butyrate, Ethyl butyrate, butyl butyrate, isopentyl butyrate, butyl lactate, pentyl lactate, butyl isobutyrate, 2-hydroxy-
Ethyl 2-methylpropionate, ethyl isovalerate, isopentyl isovalerate, methyl caproate, ethyl caproate, propyl caproate, butyl caproate, pentyl caproate, methyl caprylate, ethyl caprylate, propyl caprylate, capryl Butyl, pentyl caprylate, methyl pelargonate, ethyl pelargonate, propyl pelargonate, butyl pelargonate, pentyl pelargonate, methyl caprate, ethyl caprate, propyl caprate, butyl caprate, pentyl caprate, undecanoic acid Methyl, ethyl undecanoate, propyl undecanoate, butyl undecanoate, pentyl undecanoate, methyl laurate, ethyl laurate, propyl laurate, butyl laurate, pentyl laurate, tridecane Methyl, ethyl tridecanoic acid, tridecanoic acid propyl, butyl tridecanoic acid, tridecanoic acid pentyl, methyl myristate, ethyl myristate, myristyl-propyl, butyl myristate.

The surfactant represented by the general formula (2) may be used alone or as a mixture of two or more kinds, and the total number of carbon atoms of R ₃ and R ₄ is 8 to 16. Wherein n is 2 to 7, and the sum of n and m is 3 to
In the case of 16, after the detergent is mixed with water to form an emulsion, it is possible to separate into a detergent layer and an aqueous layer in a short time by leaving the detergent to stand. Since the amount of organic components dissolved in the aqueous layer separated into two layers in a short time is extremely small, wastewater treatment is easy, and it is economical and practical. m may be 0. R ₃ and R ₄
The total number of carbon atoms is less than 8, more than 16,
When n is less than 2, or exceeds 7, or the total number of carbon atoms of n and m is less than 3, or exceeds 16, the detergent is mixed with water to form an emulsion, and then left. By doing so, the two layers may not be separated into the cleaning agent layer and the aqueous layer in a short time, or the liquid stability as the cleaning agent may be deteriorated, which is not preferable.

The surfactant represented by the general formula (2) is used at 5 to 40% by weight. If the amount is less than 5% by weight, it may not be possible to effectively obtain surface rinsing properties such as water rinsing. If the amount exceeds 40% by weight, the viscosity of the cleaning agent may increase, resulting in a decrease in cleaning performance. Is not preferred. (A) The boiling point used in the cleaning agent of the present invention is 1
A saturated hydrocarbon and / or a saturated alicyclic hydrocarbon in the range of 60C to 280C, (b) an ester represented by the general formula (1), and (c) a ester represented by the general formula (2) Surfactants are environmentally safe compounds that have no effect such as destruction of the ozone layer and the like. When these are essential components, the wastewater treatment is significantly reduced for the first time, and the cleaning performance and The finish of the object to be cleaned is extremely excellent, and furthermore, it is economical and practical. If one of the above essential components is missing, sufficient effects such as wastewater treatment property, cleaning property, economy, practicality, etc. cannot be obtained.

In the cleaning agent of the present invention, if necessary, for example, maintaining the liquid stability of the cleaning agent, improving the stability of the cleaning object, and improving the dissolving power of the stain, as long as the effect is not impaired. Various stabilizers, additives, antifoaming agents, and the like can be added for the purpose of improving or improving workability. As stabilizers, additives, and antifoaming agents, alcohols, ethers, glycol ethers, acetals, ketones, fatty acids, nitroalkanes, amines, amides, aminoethanols, benzotriazoles, Unsaturated hydrocarbons, esters not falling under the general formula (1), nonionic surfactants, anionic surfactants, cationic surfactants, silicon-based compounds not falling under the general formula (2) Is mentioned.

When using the cleaning agent of the present invention to clean metal parts to which oil or the like has adhered or printed wiring boards to which flux or the like has adhered, for example, cleaning is performed in a cleaning tank containing the cleaning agent of the present invention. And then rinse in a rinse tank with water,
Lastly, by performing a method such as drying with warm air or the like continuously, it is possible to effectively clean. In the cleaning tank and the rinsing tank, it is effective to perform not only immersion cleaning but also a combination of rocking, ultrasonic waves, submerged spraying, showering, and the like. Providing an emulsion tank in which the cleaning agent of the present invention and water are mixed at an appropriate ratio between the cleaning tank and the rinsing tank is also effective for improving the cleaning performance. The washing tank, the emulsion tank, and the rinsing tank may each be a single tank, or may each include two or more tanks.

[0017]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to only these Examples. Evaluation of Detergency of Detergent and Water Detergent and water shown in Table 1 and Table 2 by volume ratio of 1:
The mixture was mixed at a ratio of 1 to uniformly form an emulsion. In addition, each of the surfactants shown in Table 2 has the general formula
(2) Alkylene oxide adduct of secondary alcohol
It is.

[0018]

[Table 1]

[0019]

[Table 2]

After standing for 12 hours, the separation between the detergent and water and the transparency of the aqueous layer were visually evaluated. Table 3 shows the results. In addition, cleaning agents NO.
Are examples, and Nos. 12 to 18 are comparative examples.

[0021]

[Table 3]

Evaluation of Oil Detergency As shown in FIG. 1, cleaning agents shown in Tables 1 and 2 were charged into the first and second tanks of a four-tank type washing machine equipped with an ultrasonic oscillator, and washed. The third tank and the fourth tank were charged with water, and the rinse tank was used. The temperature of the first tank and the second tank was 40 ° C.
The temperature of the third and fourth tanks was room temperature.

Various kinds of oils (presses) in a washing object (a cylindrical 30 mesh stainless steel wire mesh basket (diameter 50 mm, height 50 mm) containing 200 screws (SUS304, + pan, 3 × 10 mm)) Oil (Nippon Oil Co., Ltd.)
Made, trade name: Unipres DP-120), cutting oil (manufactured by Nippon Oil Co., Ltd., trade name: Unicut GH-35)] about 1
g was uniformly attached.

The object to be washed is placed in the first tank for one minute,
Washing was performed while immersed in the solution for 1 minute and sonicated. Next, the object to be washed was immersed in the liquid for 1 minute in the third tank, and then for 1 minute in the fourth tank, and rinsed while applying ultrasonic waves. Finally, the object to be washed was dried with a dryer set at 110 ° C.

100 ml of carbon tetrachloride
The remaining organic matter of the object to be washed is extracted with, and this amount (mg) is
Oil concentration meter [manufactured by NIC Corporation, trade name: OIL-20]
And the finished finish of the appearance was evaluated visually. Table 4 shows the results. Cleaning agents Nos. 1 to 11 are working examples and Nos. 12 to 18 are comparative examples.

[0026]

[Table 4]

Evaluation of Flux Detergency As an object to be washed, various types of fluxes (trade name: F-23, manufactured by Tamura Seisakusho Co., Ltd.)
0V, trade name: MH-320V], soldered in a molten solder tank (260 ° C) for 5 seconds, washed, rinsed, dried and washed in the same manner as in the evaluation of oil washability. Omega meter 600S
C (manufactured by Alpha Metals), the amount per square inch (μg) of the printed circuit board was calculated in terms of NaCl, and the finish of appearance was visually evaluated. Table 5 shows the results. The cleaning agents NO.
2 to 18 are comparative examples.

[0028]

[Table 5]

[0029]

The cleaning agent of the present invention uses a specific ester at a certain ratio to a certain ratio of saturated hydrocarbons, so that the detergent has a remarkably increased dissolving power to soil and a certain surfactant. Is used in a specific ratio to form an emulsion when the detergent is mixed with water, and can be separated from water in a short time. Therefore, according to the present invention, not only can the water from the object to be cleaned be easily rinsed with water (water rinsing), but also the effect that the amount of solvent contained in the wastewater after the cleaning step is extremely small can be obtained.

Accordingly, the cleaning agent of the present invention is practically safe for the environment and has no problem in occupational hygiene, furthermore, the wastewater treatment is remarkably reduced, and the cleaning performance and the finish are extremely excellent. Cleaning agent. Further, the cleaning method of the present invention is an excellent cleaning agent that practically replaces a conventional cleaning agent using a chlorofluorocarbon-based or chlorine-based solvent or an aqueous cleaning agent represented by alkali cleaning.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an apparatus for cleaning, rinsing, and drying using the cleaning agent of the present invention.

[Explanation of symbols]

 A: cleaning agent of the present invention B: water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C11D 3:18 3:20)

Claims (1)

(57) [Claims] (1) 20 to 90% by weight of a saturated aliphatic hydrocarbon and / or a saturated alicyclic hydrocarbon having a boiling point in the range of 160 ° C. to 280 ° C., and (b) a compound represented by the general formula (1). A detergent comprising 5 to 50% by weight of an ester represented by the formula (c) and 5 to 40% by weight of a surfactant represented by the formula (2). R ₁ COOR ₂ (1) (wherein, R ₁ and R ₂ represent a hydrocarbon group or a hydroxy hydrocarbon group, and the total number of carbon atoms of R ₁ and R ₂ is 3)
~ 18)