JP3164656B2 - Detergent composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition suitable for cleaning precision metal parts, printed circuit boards, etc., which can be replaced with a fluorocarbon-based or chlorine-based cleaning agent.

[0002]

2. Description of the Related Art Hitherto, chlorofluoroethane-based compounds (fluorocarbons) and chlorine-based solvents such as trichloroethane and trichloroethylene have been widely used as cleaning agents, particularly industrial cleaning agents such as machines and instruments. These solvents have the selective solubility of dissolving fats, oils, greases, waxes, and the like, and have the remarkable advantage of nonflammability, and are widely used.

In recent years, however, some types of chlorofluorocarbons, such as chlorofluorocarbon 113, and chlorinated solvents, such as 1,1,1-trichloroethane, have excellent cleaning effects, but have a global environmental problem of depletion of the ozone layer. In terms of
In recent years, regulations or restrictions on production and use have been made, or
Its use has been problematic internationally. Therefore, instead of these cleaning agents, cleaning agents of alcohol type, terpene type and hydrocarbon type have been studied. However,
All of these have insufficient detergency, are flammable,
There are problems such as high foaming property, detergency not sustained, and damage to the object to be cleaned. Further, there has been proposed a cleaning agent in which a hydrophobic solvent and water are co-dissolved through the intermediation of a water-soluble solvent to exclude dangerous substances under the Fire Service Law (Japanese Patent Laid-Open No. 2-29).
No. 4093), however, it is difficult to obtain a uniform detergent, and even if the surfactant is used for homogenization, not only a surfactant having a low HLB is difficult to homogenize but also an insufficient point such as easy foaming. Many. In the cleaning agent proposed in JP-A-3-9772, water is added to a water-soluble glycol ether-based solvent, but the detergency is reduced by adding water. JP-A-3-62895 discloses a polyalkylene glycol monoalkyl (having 6 to 22 carbon atoms).
Further, US Pat. No. 3,886,099 and JP-A-4-57897 propose that a detergent using an ether is used in combination with a glycol ether and an amine. However, in the former, a specific water-soluble glycol ether is preferred, and in the latter two, a glycol ether having a hydrocarbon residue having 4 to 14 carbon atoms is particularly preferred. As described above, the use of amines improves the detergency, but the dissolving power is not sufficient, and the detergency is not only long-lasting, but also has insufficient plasticity and is still satisfactory. Has not been obtained.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent detergency in place of the above-mentioned chlorofluorocarbon-based and chlorine-based solvents. so,
An object of the present invention is to provide a cleaning agent which does not attack metals and plastics, has a long-lasting detergency, and has no problems in toxicity and odor.

[0005]

Means for Solving the Problems and Actions The present inventors have conducted intensive studies in view of the state of the art as described above, and as a result, as shown below, have a general formula (I) having a relatively low water solubility. In the case of using a compound represented by the formula, a compound having a relatively high water solubility represented by the general formula (II), and an amine represented by the general formula (III) and water, the above-mentioned problem is solved. It was found that the present invention was obtained, and the present invention was completed.

The present invention relates to a cleaning composition containing at least the following A to D, which is not subject to dangerous substances under the Fire Service Act, and is applicable to printed circuit boards, solder fluxes, solder pastes, various oils and the like. With extremely high detergency,
An object of the present invention is to provide a detergent composition exhibiting long lasting detergency.

That is, the detergent composition of the present invention contains at least A, B, C and D described below and is a compound represented by the general formula (I) with respect to the compound represented by the general formula (II) Is a cleaning composition characterized by having a weight ratio of 0.1 to 5. A) Compound represented by general formula (I): 10 to 70% by weight

[0008]

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B) 15 to 80% by weight of a compound represented by the general formula (II)

[0010]

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C) A compound represented by the general formula (III): 5 to 15% by weight

[0012]

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And D) 5-10% by weight of water.

A first feature of the present invention is that a polypropylene glycol monoalkyl ether solvent represented by the above-mentioned general formula (I) having a relatively low water solubility and the above-mentioned general formula (I)
A polyethylene glycol alkyl ether-based solvent which is completely dissolved in water represented by I), the alkanolamine represented by the general formula (III), and water are mixed at a specific concentration to obtain a detergent composition. As a result, it is exempt from hazardous materials under the Fire Services Act, and has extremely excellent cleaning power even for dirt such as wax, resin and grease, and
It has a long lasting detergency and a good stability against metals and plastics.

As a solvent having low water solubility, there is a completely water-insoluble solvent such as a hydrocarbon compound which has been conventionally used, and such a completely water-insoluble solvent is a stable detergent when mixed with water. Because it is difficult to obtain
It is necessary to have hydrophilicity, and a polypropylene glycol monoalkyl ether solvent is most suitable. On the other hand, the water-soluble solvent alone has a weak detergency against oily stains.

Therefore, by blending a completely water-soluble polyethylene glycol alkyl ether-based solvent and the above-mentioned polypropylene glycol monoalkyl ether-based solvent in a specific ratio, the solvent has an ability to dissolve various stains such as wax, resin and grease. The present invention has been found not only to be able to dramatically improve, but also to obtain a surprising result that the stability against metals and plastics is extremely good, thereby completing the present invention. Here, when the amount of the polypropylene glycol monoalkyl ether-based solvent represented by the general formula (I) is too large in the combination of the two solvents, the durability of the detergency decreases. On the other hand, when the amount of the polyethylene glycol alkyl ether-based solvent represented by the above general formula (II) is too large, the detergency against oily stains and the stability against plastics and metals are reduced. Therefore, it is necessary to mix and use both types of solvents, and the mixing ratio is important. This mixing ratio is usually 0.1 to 0.1 as a weight ratio of the compound represented by the general formula (I) to the compound represented by the general formula (II).
5, preferably 0.2 to 2. When the mixing ratio is out of the above range, a cleaning composition having excellent detergency, long lasting detergency, and excellent stability against plastics and metals cannot be obtained.

Representative examples of the polypropylene glycol monoalkyl ether solvent represented by the general formula (I) having relatively low water solubility in the present invention include di, tri and
Monopropyl ether of tetrapropylene glycol,
Examples include monobutyl ether and monopentyl ether. The amount of the detergent composition of the present invention (the compound represented by the above general formula (I), the compound represented by the above general formula (II) and the compound represented by the above general formula (III) and water The sum of the weights of each
Medium, 10 to 70% by weight, preferably 15 to 50% by weight
It is said. If this amount is less than 10% by weight, the plasticity is reduced, while if it exceeds 70% by weight, the durability of the detergency is reduced.

The polyethylene glycol alkyl ether solvent which is completely soluble in water and represented by the general formula (II) used in the present invention is a mono- or di-alkyl ether of polyethylene glycol. Monoethyl ether, diethyl ether, monopropyl ether, dipropyl ether, monobutyl ether and dibutyl ether of di, tri and tetraethylene glycol are included. Its usage is
In the cleaning composition of the present invention, it is 15 to 80% by weight, preferably 30 to 70% by weight. If this amount is less than 15% by weight, it is difficult to obtain a uniform composition when mixed with water,
On the other hand, if it exceeds 80% by weight, the stability to plastic decreases.

A second feature of the present invention is that an alkanolamine represented by the above general formula (III) is further used in combination. Thereby, the detergent composition of the present invention exhibits extremely high detergency even without adding a detersive surfactant. Further, it not only enhances the detergency, but also has a high rust prevention property against metals and has a long lasting detergency. As a result, the object to be cleaned can be cleaned without being corroded, and the running cost can be reduced.
The used amount is 5 to 15% by weight, preferably 6 to 10% by weight in the cleaning composition of the present invention. If the amount used is less than 5% by weight, both the detergency and rust resistance are reduced, and the durability of the detergency is shortened. On the other hand, if it exceeds 15% by weight, the viscosity increases and the detergency also increases the amount used. It doesn't rise as much as it did.

Any of these compounds represented by the general formula can be used alone or in combination of two or more.

Further, the amount of water used is also important, and is 5 to 10% by weight in the cleaning composition of the present invention. If the amount of water used exceeds 10% by weight, the detergency decreases, while if the amount of water used is less than 5% by weight, it shows a flash point and is regarded as a dangerous substance under the Fire Service Law.

[0022]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Example 1 The following components were placed in a flask and stirred at 50 ° C. for 30 minutes to obtain a detergent composition. Dipropylene glycol monopropyl ether 30% by weight Diethylene glycol monobutyl ether 50 {Triethanolamine 10} Water 10 >> The obtained detergent composition was evaluated for detergency, long lasting detergency and stability to various materials. The results are shown in Tables 3 to 7. That is, Table 3 shows the evaluation of the detergency and the detergency of the detergency, Tables 4 and 5 show the evaluation results of the stability against plastic, and Tables 6 and 7 show the stability against the metal. Table 1 shows the cleaning compositions of Examples 2 to 9 obtained in the same manner as in Example 1 together with the cleaning compositions of Example 1. Table 1 shows the content (% by weight) of each component of these cleaning compositions and the flash point of each cleaning composition. These cleaning compositions were tested as described below.

[0023]

[Table 1]

Comparative Examples The detergent compositions of Comparative Examples 1 to 5 shown in Table 2 were obtained, and the same tests as those of the examples were performed on these compositions. In addition,
Table 2 shows the content (% by weight) of each component of these cleaning compositions and the flash point of each cleaning composition. Tables 3 to 7 show the evaluation results of the cleaning compositions of the comparative examples in the same manner as in the examples.

[0025]

[Table 2]

Evaluation method for cleaning performance The surface of a printed circuit board soldered with solder paste is
The composition was washed with the detergent composition of the present invention (hereinafter sometimes simply referred to as a detergent) and evaluated by the following.

Soldering process of printed circuit board Printed circuit board ICB-4.5 cm × 7.0 cm made by Sunhayato
86G was coated with solder paste CS63S manufactured by Nippon Filler Metals Co., Ltd., and soldered at 250 ° C. for 10 seconds.

Washing conditions 200 g of the detergent was put in a 200 ml beaker and heated to 60 ° C. The printed circuit board was immersed for 2 minutes while stirring at 150 rpm. Next, this is added to water 20 at room temperature.
After being immersed in 0 ml for 1 minute, the state of cleaning of the surface of the printed circuit board rinsed with running water was visually observed, and judged by ionic residues.

Evaluation method of sustainability of detergency 19.6 g of rosin and 0.2 g of stearic acid per 180 g of detergent
And 0.2 g of diethylamine hydrochloride are dissolved and 10%
A synthetic soil solution was evaluated under the same washing conditions as in the above-described method for evaluating washability, except that this solution was used in place of the detergent under the above wash conditions.

Evaluation Method for Stability to Plastic 200 g of a detergent was placed in a 200 ml beaker and heated at 60 ° C. Various plastic test pieces were immersed for 10 minutes while stirring at 150 rpm. Next, this was immersed in 200 ml of water at room temperature for 1 minute, and then the state of the surface of the plastic test piece washed with running water was visually observed.
And it evaluated by the weight change rate.

Evaluation method for stability against metal Put 50 g of a detergent in a 50 ml sample bottle, immerse various metal test pieces in this while heating in a constant temperature bath at 50 ° C., and then leave at room temperature for 4 hours. Then, the state of the surface of the metal test piece after washing with acetone was visually observed, and evaluated by the weight change rate.

[0032]

[Table 3]

^{* 1} : 19.6 g of rosin in 180 g of fresh liquid,
A solution in which 0.2 g of stearic acid and 0.2 g of diethylamine hydrochloride are dissolved. ^{* 2} : Visual judgment. ◎ No residue was found. ○ Slightly low gloss on the solder surface. × Residues are observed. ^{* 3} : Omega meter used Unit μg NaCl /
inch ²

[0034]

[Table 4]

[0035]

[Table 5]

[0036]

[Table 6]

[0037]

[Table 7]

[0038]

The cleaning composition of the present invention has the following advantages: (1) It has excellent detergency, for example, it has particularly excellent detergency against flux, oil, grease, wax and the like. (2) Since it has good resistance to metals and plastics, it is suitably used for cleaning various printed circuit boards and metal parts. (3) Long-lasting detergency enables long-term use, thus reducing running costs. Therefore, the cleaning composition of the present invention is widely and suitably used in various cleaning methods as an alternative to the conventional fluorocarbon and chlorine-based cleaning agents.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C11D 7:32) (72) Inventor Teruyuki Triangle 5-2931, Urago-cho, Yokosuka-shi, Kanagawa Prefecture Toho Chemical Industry Co., Ltd. (72) Invention Person Ken Hibara 5-2931, Urago-cho, Yokosuka City, Kanagawa Prefecture Toho Chemical Industry Co., Ltd. Mototaka Toshima 1-3-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Kasei Kogyo Co., Ltd. (56) References JP-A-4-122800 (JP, A) JP-A 64-88548 (JP, A) JP 59-134891 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C11D ⁷ /00-7/60 C23G 5/032-5/036 H05K 3/26

Claims (1)

(57) [Claims] 1. At least the following A, B, C and D
And a weight ratio of the compound represented by the general formula (I) to the compound represented by the general formula (II) is set to 0.1 to 5. A) Compound represented by general formula (I): 10 to 70% by weight B) A compound represented by the general formula (II): 15 to 80% by weight C) 5 to 15% by weight of a compound represented by the general formula (III) And D) 5-10% by weight of water.