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Leadless soldering tin paste

A lead-free solder paste, solder paste technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as interference, no color difference, etc., to achieve the effect of improving performance

Inactive Publication Date: 2008-01-30
KELITAISHENGZHEN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this colored film may be disturbed by subsequent welding operations and may be removed from the surface of the welded product
In U.S. Patent 4670298, a kind of fluorescent fuel that can be illuminated by ultraviolet lamps is disclosed in the solder composition to check the quality of soldering, but when this solder is used, there is no obvious color difference. naked eye recognition

Method used

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Examples

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Embodiment Construction

[0018] Include the following components in the solder described in the present invention:

[0019] 80-95% by weight is solder powder containing at least two components;

[0020] The remaining components with a weight ratio of 5-20% include a soldering flux composed of a rosin thickener, at least one organic acid, a thixotropic agent, at least one fuel and a fluorescent dye.

[0021] The solder powder contains three components of tin, silver and copper.

[0022] The flux in it contains the following components:

[0023] 45-50% hydrogenated rosin by weight;

[0024] Thixotropic agent with a weight ratio of 2-6%;

[0025] 1-15% active agent by weight;

[0026] at least one dye in a weight ratio of 0.2-0.4;

[0027] 0.01-0.4% by weight of at least one fluorescent dye.

[0028] The solder paste composed of the above ingredients undergoes a process from colored to colorless after being melted during use, and it will emit fluorescence when irradiated by an ultraviolet lamp. In...

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Abstract

The invention belongs to a soldering tin in the electron and micro-electron circuit welding field, in particular to a novel soldering tin which increases the naked-eye discrimination by implementation from colorful conversion to colorless conversion after the soldering tin is melted. The soldering tin paste includes the tin powder which includes at least a fluorescent dye and at least a welding flux of the colorful dye; by the circumfluence melting, the colorful dye is changed into colorful dye, wherein, the fluorescent dye keeps the intrinsic characteristic and can emit the fluorescent under the irradiation of the ultraviolet radiation. The invention can provide a novel soldering tin which can be discriminated by the naked eyes and meanwhile by the emitting of the irradiation. The solid state of the invention has a certain color before using, the color appears after the soldering tin is melted, and different soldering tins can be discriminated by the fluorescent display of the invention by the irradiation of the ray.

Description

【Technical field】 [0001] The invention belongs to a solder in the field of electronic and microelectronic circuit welding, in particular to a new type of solder that can be recognized by naked eyes by realizing the conversion from colored to colorless after the solder is melted during the soldering process. 【Background technique】 [0002] Solder paste is generally a mixture of low melting point solder powder and flux. Solder paste wets parts with molten solder powder and solidifies to form mechanically strong solder joints for soldering electronic components. The solder powder used in the electronics industry should be strong and non-corrosive, and at the same time have a certain degree of electrical conductivity. The traditional tin-lead solder used for electronic assembly has the above-mentioned excellent characteristics. For example: the junction has excellent mechanical properties and solder paste wetting. However, in recent years, countries have enhanced their awarene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26B23K35/22
Inventor 李维克
Owner KELITAISHENGZHEN ELECTRONICS
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