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Soldering flux and preparation method thereof

A flux and rosin technology, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of voids between the external electrode sheet and the piezoresistor electrode, pure tin solder and the external electrode sheet are not tinned, and silver-containing solder is melted Incomplete and other problems, to achieve the effect of high reliability of long-term electrical performance, easy to obtain, and good welding

Inactive Publication Date: 2012-06-27
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the flux of the present invention in the soldering process can solve the problems of incomplete melting of silver-containing solder, voids between the external electrode sheet and the varistor electrode, and no tinning between the pure tin solder and the external electrode sheet The problem

Method used

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  • Soldering flux and preparation method thereof
  • Soldering flux and preparation method thereof
  • Soldering flux and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0030] The preparation method of flux among the present invention comprises the following steps:

[0031] a, rosin is ground into powder;

[0032] B, the rosin powder of step a is dissolved in the alkyl alcohol below 8 carbons;

[0033] c. Add deionized water and stir evenly.

[0034] Wherein, in the step b, the rosin powder is dissolved until no granular matter can be seen.

[0035] The preparation method of the flux that does not contain deionized water in the present invention may further comprise the steps:

[0036] a, rosin is ground into powder;

[0037] b. Dissolving the rosin powder in step a in an alkyl alcohol with 8 carbons or less.

[0038] Wherein, in the step b, the rosin powder is dissolved until no granular matter can be seen.

[0039] The flux of the present invention belongs to the resin flux, and its main component is rosin. Rosin mainly plays the role of isolating air and preventing metal surface oxidation, and can react with solder and the oxide film...

Embodiment 1

[0046] The preparation of embodiment 1 flux

[0047] Materials: hydrogenated rosin, methanol, deionized water.

[0048] Method: a, weigh 20g of hydrogenated rosin, grind it into powder;

[0049]B. Dissolve the rosin powder in step a in 10g of methanol, and stir evenly to dissolve the rosin until no granular matter can be seen;

[0050] c. Add 70 g of deionized water into the mixture obtained in step b, and stir evenly.

[0051] The physical and chemical parameters of the prepared flux are shown in Table 1.

Embodiment 2

[0052] The preparation of embodiment 2 welding flux

[0053] Materials: Masson rosin, ethanol.

[0054] Method: a. Weigh 10g of rosin massoniana and grind it into powder;

[0055] b. Dissolve the rosin powder in step a in 90 g of ethanol, stir evenly to dissolve the rosin until no granular matter can be seen.

[0056] The physical and chemical parameters of the prepared flux are shown in Table 1.

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Abstract

The invention belongs to the field of soldering fluxes, and in particular relates to a soldering flux for welding two electrodes of a piezoresistor and an outer electrode plate and a preparation method thereof. According to the soldering flux, the technical problems of incompletely melting of silver-containing soldering tin, a cavity between the outer electrode plate and the electrodes of the piezoresistor and difficulty in soldering between pure tin solders and the outer electrode plate are solved. According to the technical scheme, the invention provides a soldering flux. The soldering flux comprises the following components in percentage by weight: 10 to 90 percent of alkyl alcohol having less than 8 carbon atoms, 10 to 30 percent of rosin and 0 to 70 percent of deionized water.

Description

technical field [0001] The invention belongs to the field of flux, more specifically, the invention relates to a flux used for welding two electrodes of a varistor and an external electrode sheet and a preparation method thereof. Background technique [0002] Soldering is a major process in electronics assembly. Flux is an auxiliary material used in welding, which can help and promote welding in the welding process. The main function of the flux is to remove the oxides on the surface of the solder and the base metal to be welded, so that the metal surface can achieve the necessary cleanliness. It prevents re-oxidation of the surface during soldering, reduces the surface tension of the solder, and improves soldering performance. The quality of flux performance directly affects the quality of electronic products. [0003] There are many kinds of fluxes, which can generally be divided into inorganic series, organic series and resin series. [0004] Inorganic fluxes have str...

Claims

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Application Information

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IPC IPC(8): B23K35/363
Inventor 杨伏国
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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