JPH06240296A - Flux cleaner composition - Google Patents

Abstract

PURPOSE:To obtain a flux cleaner composition improved in cleaning properties by mixing diacetone alcohol and water as effective components with optionally a surfactant. CONSTITUTION:The composition excellent in cleaning properties and safety is obtained by mixing 70wt.% or above diacetone alcohol with 30wt.% or below water and mixing the obtained mixture with optionally 0.1-20wt.% nonionic surfactant such as polyoxyethylene alkyl ether of an HLB of 5-20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for removing flux used in a manufacturing process of a mounted printed circuit board.
The present invention relates to a flux detergent composition which has excellent detergency and is easy to regenerate the detergent and to easily treat wastewater.

[0002]

2. Description of the Related Art Conventionally, in the process of mounting and mounting electronic components on a printed circuit board, soldering is performed to fix the components to the board, and flux is used to quickly perform this soldering. Flux is used for the purpose of cleaning the copper circuit surface on the substrate and improving the adhesion between solder and copper and the wettability of solder to copper. As a component, there are resin components such as rosin resin, terpene resin, and synthetic resin. Contains activator. By the way, if an activator component among these components remains on the printed circuit board, it may cause circuit short circuit due to circuit corrosion or migration. Therefore, in order to solve this cause, the cleaning agent is used to remove the flux residue. Conventionally, CFC 113 has been used as a flux cleaning agent, but there is a concern that it will destroy the ozone layer, and a cleaning agent that replaces CFC is desired.

Under these circumstances, various types of detergents have been investigated, and in JP-A-3-149299, an alkali saponification-type detergent is disclosed in JP-A-3-152197 and JP-A-4.
No. 59898, JP-A-4-68097 discloses a surfactant type, and JP-A-4-57900 discloses an aqueous detergent using a water-soluble higher alcohol solvent.
-212497, JP-A-3-243700, and JP-A-3-243700
No. 260,000 discloses a non-aqueous detergent in which a surfactant is added to hydrocarbon.

[0004]

However, these CFC substitute cleaning agents also have a problem, and both the water-based cleaning agent and the non-water-based cleaning agent require a rinsing step with water after the completion of cleaning. In addition, the COD (chemical oxygen demand) and BOD (biochemical oxygen demand) of the wastewater generated in this process have high values, and the wastewater treatment is required because the environmental load is large, but biological treatment is difficult. Due to such problems, it is difficult to deal with the equipment from the viewpoint of increasing the size of wastewater treatment equipment and increasing the number of treatment steps.
Further, it is difficult to regenerate the cleaning agent by separating the cleaning agent component of the cleaning liquid used for cleaning from the flux residue, for example, the resin component or the contaminant component such as the activator oxide. In addition, since terpene-based compounds and solvent-based organic chemicals are used in non-aqueous detergents, there are problems such as having to deal with them as dangerous substances, and there is a study to eliminate all these problems. It continues. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flux detergent composition that is excellent in detergency, and that facilitates regeneration of a detergent and treatment of wastewater.

[0005]

That is, in the present invention, 70% by weight or more of diacetone alcohol and 30% by weight or less of water are used as active ingredients, and a surfactant is added in an amount of 0.1 to 2 if necessary.
The present invention relates to a flux detergent composition containing 0% by weight. Diacetone alcohol is an alcohol having 6 carbon atoms, and has a flash point of 57 ° C by itself, and is specified by the Fire Service Law as Category 4 and 3 petroleum, but it is 10% by weight of water because it is freely miscible with water. By adding the above, it can be made into a non-dangerous substance. Similarly, 2-butoxyethanol having 6 carbon atoms can be made into a non-dangerous substance by adding water, but it is not suitable for use because of its poor detergency and high BOD. On the other hand, hexyl alcohol having 6 carbon atoms or more, heptyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol, undecyl alcohol, dodecyl alcohol and the like have poor miscibility with water or do not have water. Can not be non-dangerous goods.

Further, methyl alcohol having a small number of carbon atoms,
Ethyl alcohol and propyl alcohol are not preferable for use because they require a large amount of water to make them non-hazardous substances and have poor detergency. Also, in wastewater treatment, C
Although the values of OD and BOD become a problem, the value of BOD is very small in the case of diacetone alcohol, that is, there is an advantage that the apparatus and equipment for wastewater treatment can be downsized and the treatment man-hours can be reduced.

The surfactant optionally used in the present invention has an HLB value of 5 to 5 in consideration of compatibility with water.
20 Further, those having a water solubility of 10 to 20 are preferable.
For example, carboxylic acid-based, sulfonic acid-based, sulfuric acid ester-based, phosphoric acid ester-based anionic activators, aliphatic amine salts and their quaternary ammonium salts, aromatic amine salts and their quaternary ammonium salts, and heterocyclic amines. Salt and its 4
Cationic active agents such as primary ammonium salts and betaine type,
Zwitterionic activators such as aminocarboxylic acid salts and imidazoline derivatives, polyoxyethylene fatty acid esters, polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene-polyoxypropylene block polymers, sorbitan fatty acid esters, poly One or more nonionic activators such as oxyethylene sorbitan fatty acid ester and polyoxyethylene alkylamine ether may be added and used. Of these, nonionic activators such as polyoxyethylene alkyl ether and polyoxypropylene
Those using a polyoxyethylene block polymer are preferable from the viewpoints of detergency and foamability.

The surfactant is used for preventing re-adhesion of flux residue to the object to be cleaned in the rinsing step with water, and when the amount added is 20% by weight or more, diacetone alcohol as a cleaning agent component is added. The composition ratio decreases, and the cleaning performance deteriorates significantly. Therefore, the addition amount of the surfactant is preferably 20% by weight or less, more preferably 10% by weight or less. ADVANTAGE OF THE INVENTION According to this invention, the washing | cleaning property and the water rinsing property can be implement | achieved efficiently, and also the cleaning agent which can easily perform the waste water treatment by regeneration processing and biodegradation can be provided.

[0009]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. Examples 1 to 7 The cleaning composition shown in Table 1 was prepared, and the cleaning property, COD, B
OD and regeneration processability were evaluated by the following methods, and the results are shown in Table 2. The flux used for the evaluation was a commonly used rosin-based flux. Comparative Examples 1 and 2 Using the existing water-based cleaning agents A and B, the same evaluations as those in Examples were carried out, and the results are shown in Table 2.

[0010]

[Table 1]

(Cleaning Evaluation Method) Flux was coated on a 4 cm square aluminum plate and heated at 250 ° C. for 3 minutes to prepare a flux residue, which was used as a test plate for cleaning evaluation. This test plate was immersed in a cleaning agent heated to 40 ° C. for 5 minutes and allowed to stand, and after washing with water, the flux residue removal rate was calculated from the weight change using the following formula to evaluate the cleaning property. X: Weight of flux residue before cleaning (g) Y: Weight of flux residue after cleaning (g) (COD measurement method) COD is JIS K 0102-
It was measured according to 1986 (Factory drainage test method). (Method of measuring BOD) BOD is JIS K 0102-
It was measured according to 1986 (Factory drainage test method).

[0012]

[Table 2]

(Evaluation method of recyclability) A flux of 25
A flux residue is prepared by heating at 0 ° C. for 3 minutes, and is dissolved so that the flux residue content in the cleaning agent is 20%. Sample pressure 15
Permeate is sampled by permeating the test membrane under conditions of kgf / cm ² , circulation flow rate 5 l / min, and liquid temperature 25 ° C. The concentration of flux residue in the sampled permeate is measured to evaluate the separability of the cleaning agent component and the flux residue. As the test film, a polyvinyl alcohol-based or polysulfonic acid-based film manufactured by Nitto Denko Corporation is used. The evaluation is ◯ when the flux residue in the permeate is 0%, and x otherwise.

Examples 8 to 10 Waste water for testing containing a predetermined concentration of a detergent having a composition ratio of diacetone alcohol: water: polyoxyethylene alkyl ether of 80: 15: 5 was prepared, and the detergent was prepared by the following method. Was evaluated for wastewater treatment. Figure 1 shows the results of each test.
~ Fig. 3 shows, and Table 3 shows the results of wastewater treatment evaluation. The detergent concentrations of the test waste water are 5% in Example 8, 1% in Example 9, and 0.5% in Example 10.

Comparative Examples 3 and 4 Using the existing water-based cleaning agents A and B, the same evaluations as in Examples 8 to 10 were carried out, and the respective test results are shown in FIGS. 4 and 5.
Table 3 shows the evaluation results of the wastewater treatment property. The detergent concentration of the test waste water is as follows.

(Wastewater treatment evaluation method) 1.0 kg TOC /
The treatment was performed for 30 days with a volume load of m ³ · day. The wastewater treatability was measured by measuring TOC (total organic carbon) before treatment and TOC after treatment, calculating the TOC removal rate from the measured value according to the following equation, and using the value, the following criteria were evaluated. Z: TOC (mg / l) before treatment W: TOC (mg / l) after treatment Wastewater treatment evaluation ◯: Easy biodegradability removal rate 80-100% △: Biodegradability slightly difficult removal rate 60-80 % ×: Biodegradability difficult removal rate 60 or less

[0017]

[Table 3]

[0018]

As described in detail above, the flux detergent composition of the present invention has good detergency, COD,
Since the BOD is low, the environmental load is small and the cleaning agent and the flux residue can be completely separated by the membrane. Further, since it is easily biodegraded, it is possible to reduce the treatment time and reduce the size of the treatment device in the treatment of wastewater. Therefore, detergency,
It is possible to provide a flux detergent composition which is excellent in safety and is easy to recycle and treat wastewater, and its industrial value is great.

[Brief description of drawings]

FIG. 1 is a graph showing the state of TOC before and after processing in Example 8.

FIG. 2 is a graph showing the state of TOC before and after processing in Example 9.

FIG. 3 is a graph showing the state of TOC before and after the treatment of Example 10.

FIG. 4 is a graph showing the state of TOC before and after the treatment of Comparative Example 3.

5 is a graph showing the state of TOC before and after processing in Comparative Example 4. FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Yamamoto 3-1-2 Kanda Surugadai, Chiyoda-ku, Tokyo Hitsukasei Techno Plant Co., Ltd.

Claims (5)

[Claims] 1. A flux detergent composition containing diacetone alcohol and water as active ingredients. 2. The flux detergent composition according to claim 1, containing 70% by weight or more of diacetone alcohol and 30% by weight or less of water. 3. The flux detergent composition according to claim 1, further comprising a surfactant if necessary. 4. The flux detergent composition according to claim 3, wherein the amount of the surfactant added is 0.1 to 20% by weight. 5. The detergent composition according to claim 3 or 4, wherein the surfactant has an HLB of 5 to 20.