JPH06340892A - Flux-cleaning agent - Google Patents

Abstract

PURPOSE:To provide a flux-cleaning agent which quickly and completely removes a flux deposited on an electronic part, a precision machine part, a printed circuit board, etc., and does not remain on those objects cleaned. CONSTITUTION:A flux-cleaning agent contains, as the main components, 1 pt.wt. 3-methyl-3-alkoxybutanol, 0.01-25 pts.wt. surfactant, and 0.01-25 pts.wt. alkaline compd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to flux cleaners. More specifically, the present invention relates to a flux cleaner that quickly and completely cleans and removes flux adhering to electronic parts, precision machine parts, printed wiring boards, etc., and that the cleaner does not remain on the object to be cleaned.

[0002]

2. Description of the Related Art Flux is used for soldering in the assembly process of electronic parts, precision machine parts and the like.
After assembly, these fluxes remaining on the parts are
It must be removed as it may impair the aesthetics and electrical insulation of the product and cause corrosion. Conventionally, as a method of removing the flux remaining in such a part, a method of cleaning with a chlorofluorocarbon solvent, a method of cleaning with a petroleum solvent, a method of cleaning with an alkali, etc. are known. ing.

[0003]

However, there are various problems in the method of cleaning these fluxes.
For example, the method of cleaning using a chlorofluorocarbon-based solvent has a problem that it may destroy the ozone layer in the stratosphere and cause skin cancer. In addition, the method of cleaning with a petroleum-based solvent dissolves the flux well, but cannot be rinsed with water, and it requires rinsing with a large amount of a petroleum-based solvent, resulting in poor economy and flammability of the solvent. There are problems such as having to pay attention to.

A method of washing with an alkali is to wash rosin, which is the main component of the flux, with a water-soluble alkali salt, and the flux is an oily substance to be added to the unsaponifiable component in the rosin and the rosin. However, if the content of components other than rosin is high, the cleaning rate will be reduced.

The present invention has been made by paying attention to the above points, in which a specific solvent and a surfactant are used in the presence of an alkaline compound to completely remove the flux adhered to electronic parts, precision machine parts and the like. The gist of the present invention is to provide a flux cleaning agent for removing the flux.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have used 3-methyl-3-alkoxybutanol as a solvent and used a surfactant and an alkaline compound in combination therewith. It was found that the flux can be quickly and completely removed by using the aqueous solution prepared above and can be rinsed with water without causing the problem of environmental pollution due to a solvent or the like, and the flux can be easily washed, Was completed.

That is, the present invention is mainly composed of 3-methyl-3-alkoxybutanol, a surfactant and an alkaline compound, and contains 3-methyl-3-alkoxybutanol, a surfactant and an alkaline compound in a ratio of 1: 0. 01-25:
It is a flux detergent contained in a weight ratio of 0.01 to 25.

Examples of 3-methyl-3-alkoxybutanol used in the present invention include 3-methyl-3-methoxybutanol, 3-methyl-3-ethoxybutanol and 3-methyl-3-butoxybutanol.

As the surfactant used in the present invention, alkylbenzene sulfonate, alkyl sulfate, α-olefin sulfate, higher alcohol sulfate ester salt, polyoxyalkylene higher alcohol ether sulfate ester salt,
Anionic surfactant such as castor oil sulfate ester salt, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenyl ether, polyoxyethylene polyoxypropylene block or random copolymer, polyoxyalkylene alkyl ester, polyoxyalkylene alkylamine, Nonionic surfactants such as polyoxyalkylene castor oil ether, polyoxyalkylene hydrogenated castor oil ether, fatty acid alkanolamide, alanine-type amphoteric surfactant, amidobetaine-type amphoteric surfactant, imidazoline-type amphoteric surfactant, amino acid-type Examples thereof include amphoteric surfactants such as amphoteric surfactants, and at least one selected from these groups can be used. Examples of the polyoxyalkylene group include a polyoxyethylene group and / or a polyoxypropylene group.

The alkaline compound used in the present invention includes hydroxides such as sodium hydroxide and potassium hydroxide, carbonates such as sodium carbonate and potassium carbonate, silicates such as sodium silicate and potassium silicate, sodium phosphate. ,
Examples include phosphates such as potassium phosphate, tetrasodium ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid salts such as tetrapotassium ethylenediaminetetraacetic acid, and alkanolamines such as aqueous ammonia, monoethanolamine, diethanolamine, and triethanolamine. At least one selected from the above can be used.

In the flux cleaner of the present invention, the above-mentioned 3
-Methyl-3-alkoxybutanol, surfactant and alkaline compound 1: 0.01-25: 0.01-25
It is preferable to contain it in a weight ratio of 1: 0.2.
-10: 0.2-10 is more preferable. 3-methyl-3
If the amount of the surfactant is less than 0.01 by weight with respect to the alkoxybutanol 1, the alkali-salt rosin and the oily substance are easily redeposited during washing with water, and if the amount exceeds 25, 3-methyl-3- It is not preferable because the amount of alkoxybutanol blended becomes small and the cleaning property is not improved. When the amount of the alkaline compound is less than 0.01 in weight ratio with respect to 3-methyl-3-alkoxybutanol 1, the rosin in the flux cannot be sufficiently converted into an alkali salt, which deteriorates the detergency. If it exceeds the above range, the amount of 3-methyl-3-alkoxybutanol is small, the cleaning property is deteriorated, the alkali strength is increased, and the substrate, parts, etc. may be discolored, which is not preferable.

The flux cleaning agent of the present invention is an aqueous solution containing the above-mentioned 3-methyl-3-alkoxybutanol, a surfactant and an alkaline compound as main components, and if necessary, a rust preventive agent, a defoaming agent, A chelating agent, a preservative and the like can be used in combination, and when these are used, the compounding amount thereof is preferably 0.1 to 5.0% by weight for each.

The flux detergent of the present invention can be appropriately diluted with any water to be used for washing the flux. When diluted, the dilution ratio is preferably 1 to 10 times. Further, examples of the cleaning method using this include a shower method, a dipping method, an ultrasonic cleaning method and the like, and any method can be adopted.

The flux cleaning agent of the present invention is an electronic component,
When used for cleaning precision machine parts, printed wiring boards, etc., the flux adhering to them can be quickly and completely cleaned and removed, and the cleaning agent does not remain on the object to be cleaned.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these as long as the gist thereof is not exceeded.

[0016]

【Example】

Examples 1 to 4 and Comparative Examples 1 to 5 In 80 g of ion-exchanged water, 4.94 g of 3-methyl-3-methoxybutanol, 0.25 g of sodium alkylbenzene sulfonate and 14.81 g of sodium metasilicate.
Is added and melted at room temperature to remove flux cleaning agent No. 1
(PH 13.4) was prepared. Next, using 3-methyl-3methoxybutanol shown in Table 1, a surfactant, an alkaline compound, and ion-exchanged water, the flux detergent NO. 2 to NO. 9 was adjusted. The obtained flux cleaning agent NO. 1-NO. 9, the following flux cleaning test and flux dissolution test were performed to evaluate the performance. Flux cleaner NO. 1 to
No. 4 (Examples 1 to 4) and flux cleaner NO. 5-9
Table 1 shows the compositions and blending amounts of (Comparative Examples 1 to 5) and the results of performance evaluation using the same.

Flux cleaning test. Flux (manufactured by Hiroki Co., Ltd., AUTO FLUX JS-64MS-1) was applied to a 100 mm x 100 mm x 1.5 mm glass epoxy resin printed wiring board so that the amount of adhesion after drying was 1 g, and 180 after application. The test piece was prepared by heating at 0 ° C. for 2 minutes. The above-mentioned test piece was immersed in 1000 ml of an aqueous solution obtained by diluting the flux detergent obtained above twice, and the flux was washed by stirring for 1 minute at a liquid temperature of 60 ° C using a magnetic stirrer. After washing, it was washed with ion-exchanged water at 60 ° C. and then dried, and then the state of the test piece was visually observed, and the washing performance was evaluated according to the following criteria. ◯: No flux residue on the surface of the test piece. Δ: Some flux residue was found on the surface of the test piece. X: There is a large amount of flux residue on the surface of the test piece.

-Flux solubility test. An aqueous solution (liquid temperature 60
(° C) 100 ml was stirred using a magnetic stirrer, a flux (the same product as used in the cleaning test) was dropped therein, and the amount of flux required until an insoluble matter was formed was measured. The solubility in flux was evaluated in accordance with the standard. A: The amount of flux dissolved is 15 ml or more. ◯: The amount of flux dissolved is 5 ml or more and less than 15 ml. B: The amount of flux dissolved is 0.5 ml or more and less than 5 ml. X: The amount of flux dissolved is less than 0.5 ml.

[0019]

[Table 1]

[0020]

As described above, the present invention is a flux cleaner containing a specific solvent, a surfactant and an alkaline compound, and is used for cleaning electronic parts, precision machine parts, printed wiring boards, etc., Flux that adheres to these can be cleaned and removed satisfactorily, and the flux removal performance is large compared to conventionally known flux cleaners, and there is no adverse effect on the environment. Exert.

Continuation of front page (51) Int.Cl. ⁵ Identification number Reference number in the agency FI Technical indication location H05K 3/26 7511-4E (72) Inventor Masafumi Moriya 1366 Nishide, Noyose-cho, Iwakura-shi, Aichi

Claims (1)

[Claims] 1. A main component of 3-methyl-3-alkoxybutanol, a surfactant and an alkaline compound, 3
-Methyl-3-alkoxybutanol, a surfactant and an alkaline compound were added in a proportion of 1: 0.01-25: 0.01
A flux cleaning agent, characterized in that the flux cleaning agent is contained in a weight ratio of 25.