JPS589793A - Solvent for flux - Google Patents

Abstract

PURPOSE:To provide an inexpensive flux solvent having non-inflammability and danger by mixing a solvent contg. specific amts. of special ethers with a flux consisting essentially of boric acid and borax. CONSTITUTION:The stock liquid contg. at least 5-10% polyoxyethylene alkylphenol ether, 5-10% potassium pyrophosphate, 3.5-5% monoethylene glycol butyl ether, 1-2% sodium metasilicate, 0.8-1.5% sodium hydroxide, and contg. as other components, for example, an extramely small amt. of alkali anionic surfactants and ethyl alcohol, and constituted of water as other components is dissolved in 10-20 times water. Such solvent is mixed with a flux consisting essentially of boric acid and borax at a ratio of about 1 by volume of the flux to 2 the solvent. Such solvent is coated on metallic surfaces, and brazing work is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solvent for flux used in a brazing operation.

Generally, as a pre-process for brazing work, the work of removing rust from the base metal (hereinafter simply referred to as metal), degreasing, cleaning, and applying flux is performed, but if the work is not completely complete, the above-mentioned rust removal work may be omitted. 17 lux may be applied immediately to the metal surface.

Therefore, from the viewpoint of removing oil and fat films, oxide films, etc. from the metal surface, methyl alcohol or water is mixed into the above-mentioned 7 lux solvent.

For example, if the metal is annealed copper (e.g. 57'Kq, manganese mesh or chromium molybdenum steel), 7 lux, which is the main component of the brazing process, is melted using a brazing filler metal whose main component is brass, and the surface of the gold 9 is melted. It is being applied to

However, methyl alcohol is not only dangerous to humans (it is also flammable, so it is dangerous when handling open flames).
It also has economic disadvantages such as high prices. On the other hand, attempts have been made to dissolve 7lux with water instead of methyl alcohol, but the flux does not disperse properly with water, and furthermore, the removal of the oil film on the metal surface is incomplete. However, this method had the disadvantage that it was difficult to perform the brazing work in an appropriate manner.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a novel flux solvent that eliminates the various difficulties described above.

Examples of the present invention will be described below.

In one embodiment of the present invention, a 7 lux solvent contains polyoxyethylene alkylphenol ether 5-1096 and potassium pyrophosphate 5-109 as its main components.
6. Monoethylene glycol butyl needle 3.5~
5%, sodium metasilicate 1~2, sodium hydroxide 0
．． 8 to 1.5%, and contains a very small amount of an alkali-anionic activator and ethyl alcohol as other components.Other components are mixed into the flux, which consists of water, and this mixing ratio is determined by volume. The ratio is 2 parts of the above solvent to 1 part of the flux.

However, examples of metals include mild steel such as STKMIIA,
Manganese steel or chromium molybdenum steel is used, the brazing material is mainly brass, and the flux melted with the above solvent is applied to the metal surface, and then brazing is performed using the torch method at approximately 900°C. The coating could be done very carefully, the solder's circumference was very good, and the strength of the bonded metal after brazing was sufficient for practical use. In addition, as another example,
The above-mentioned alkali anionic activator and one containing no ethyl alcohol were also used in the brazing operation under exactly the same conditions as above, and the same results as above could be obtained. That is, the solvent according to the present invention is mostly water, and contains polyoxyethylene alkylphenol ether, potassium pyrophosphate, and monoethylene glycol butyl ether as main components.
It does not have the above-mentioned flammability, danger to the human body, etc. (and it also has various advantages such as being very cheap).

Patent applicant: Toyo Frame Co., Ltd.

Claims (1)

[Claims] At least 5 to 1096 polyoxyethylene alcohol phenol ether and 5 to 10 potassium birophosphate
96. Monoethylene glycol butyl ether A43.5
96-596, sodium metasilicate 1-2! %. A flux solvent characterized in that a stock solution containing 0.8 to 1.596 um of 13 um (hydroxide) and water as the other component is dissolved in 10 to 20 times the amount of water.