SU1114507A1 - Flux for soldering with quick solders - Google Patents

Abstract

FLUSHING FOR A SUBSTITUTE SUBSTITUTE SUBSTITUTES, containing urea, an active component, a non-ionic surfactant from the class of ethoxylated compounds, ethyl alcohol and water, in order to reduce the corrosive effect of the flux on the vapor metals, improving the laundering of flux residues after soldering and reducing the toxicity of gaseous flux products: it also contains glycerin, and as an active component 1,2,3-triazol4, 5-dicarboxylic acid in the following ratio %, 10-15 Urea 1,2,3-triazol4, 5-dicar6ono6-J2 va acid Non-ionic surface-active substance from the class of hydroxy compounds 0.05-0-0 neny Ethyl alcohol 20-50 Glycerin 5-15 Water Rest

Description

The invention relates to soldering, in part, to fluxes for soldering with low-melting solders, for example tin-lead, tin and bismuth, and can be used in assembling radio electronic equipment.

Known flux for soldering fusible solder TP. Containing May.%:

Vaseline 20-30 Lanolin 7, Ammonium Chloride 12-15 Zinc Chloride Distilled Water 36.5-54.0 Flux residues after soldering are corrosive, and because of the presence of vaseline and lanolin, they are washed with organic solvents, with mechanical action (with a brush, brush or tampon. Washing of phtaos residues is a laborious operation and complicates the soldering process. In addition, there is a danger of incomplete removal of its residues and deterioration in the quality of the finished products.

The closest in composition and effect to this technical solution is a flux for soldering low-melting solders 2 containing, May.%:

Salt acid 35-45 Zinc chloride 5-15 ammonium chloride 3-I5 Urea 5-18

Non-ionic surfactant from the class of ethoxylated compounds 0.05-0.2

Ethyl alcohol 10-30 Water15-20

In this composition, zinc chloride, ammonium chloride and hydrochloric acid are active compounds, urea is a complexing agent, ethyl alcohol and water are solvents.

This flux has high fluxing activity, but due to the presence of zinc and ammonium chlorides in its composition, as well as a large amount of hydrochloric acid, it is corrosive. After soldering, the remnants of this flux are removed in several stages using a series of chemical substances (hydrochloric acid and calcium solutions 145072.,

nirovannogo soda Ji hot water in the past. a long time (15-20 mi. The difficulty of washing residues

The flux creates the danger of incomplete removal and a reduction in the quality of finished products. In addition, hydrochloric acid vapors formed during soldering pollute the atmosphere at workplaces.

10 The purpose of the invention is to reduce the corrosive effect of the flux on the melted metal, to improve the laundering of the flux residues after soldering and to reduce the toxicity of gaseous flux products.

The goal is achieved by the fact that a flux containing urea, an active component, a non-ionic surfactant from class 20 of ethoxylated compounds, ethyl alcohol, and water, additionally contains glycerin, and as an active component I, 2,3-triazole 4, 5-dicarboxylic acid at the following 5 The ratio of components, wt.%: Urea 10-J5 I, 2,3-triazole4, 5-dicarboxylic acid 6-12 Q Non-ionogenic surfactant from the class of ethoxylated compounds 0.05-0.1 Ethyl alcohol 20-50 5 Glycerin .5-15

WaterEverything

In this flux, urea acts as a complexing agent, while glycerin, alcohol, and water are solvent.

Used as an active component of 1,2,3-triazole-4,5-dicarone boic acid is dicarboxylated. at a temperature above its melting temperature of 5 (up to), 2,3-triazole by the equation

NH

t 2COg

1,2,3-triazole has amphoteric and complexing properties, forms water-soluble adducts with various substances of the ionic type, which contribute to surface corrosion (hydrogen cation.

3

chlorine anion and T.n.Ji. Thus, in the process of soldering, the active compound turns into a complexing agent, which cleans the welded surface from various contaminants and contributes to the formation of a high-quality weld. The proposed flux has a high flux activity equal to the activity of the known.

Introduction to the composition of the flux 1,2,3-triazol-4, 5-dicarboxylic acid in combination with other ingredients at a given quantitative ratio ensures the formation of a highly soluble in water and therefore easily flushable with water of a slightly corrosive flux.

Examples of the invention are given in table 1.

 The following substances were used as surfactants in the examples: in examples No. I and 2 - synanol (alkyloxypolyethyleneglycolt NOL), in examples No. 3 and 4, precellar EQ (alkylphenoxypolyethyleneglycol); in example No. 5 - OP - 7 (alkylphenoxypolyzene glycol ethanol, and 7.

The flux is prepared as follows. In the estimated amount of water

5074

1,2,3-TA-4,5-DCC and urea are dissolved. Then, ethyl alcohol, surfactant and glycerin are added in succession. After each component is added, the solution is mixed thoroughly until it is completely dissolved. To speed up the dissolution of the components, we allow heating (up to 35-40 ° C) in a water bath.

In tab. Figure 2 shows the test results of the embodiments of the present invention.

The results of the soldering quality test with solder nOCCy-ei-OS and the corrosive effect of the proposed flux, known and basic object for copper and metal coating are presented. in tab. 3

From the data presented in table. 2 and 3, it can be seen that the proposed flux corresponds to the supplied chain of the invention, with sufficiently active activity, it is slightly corrosive, its residues after soldering are easily removed by water washing; no toxic gases and vapors are produced during the soldering process. In addition, the flux reduces the complexity of the operation of cleaning residues after soldering.

Components

Urea

Non-ionic surfactant from the class of hydroxyethyl compounds

Ethanol

1,2, Z-triazole-4,5 Dicarboxylic acids

Glycerin Water

Table

Composition, wt.%, According to examples No.

four

5 12

3 15 12.5

0.1

0.05

0.05 50 40 34.5

8.5

- 12

8.5

15

ten

ten

29.45

19.45 22.9

table 2

Table 3

Claims (5)

Flux for brazing by refractory alloys containing urea, an active component, a nonionic surfactant from the class of ethoxylated compounds, ethyl alcohol and water, characterized in that, in order to reduce the corrosive effects of flux on brazed metals, to improve the washability of flux residues after brazing and to reduce toxicity fluxing products; it additionally contains glycerin, and as an active component 1, 2 3-triaeol ~ 4,5-dicarboxylic acid in the following ratio, wt.%: Urea 1,2,3-triazole- 10-15 4,5-dicarbonyl acid 6-12 Nonionic superficially active substance from the class hydroxyethyl Bathrooms neniy 0.05-0.1 Ethanol 20-50 Glycerol 5-15 Water Rest 20-30 7.0-9.5 12-15 7-9 solders [ΰ] 35-45 5-15 3-15 5-18 1 1114507