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Soldering flux and soldering paste

A technology of flux and solder paste, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems that have not been specifically studied

Active Publication Date: 2012-09-05
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no specific studies have been conducted on fluxes using this polymerized rosin.

Method used

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  • Soldering flux and soldering paste
  • Soldering flux and soldering paste
  • Soldering flux and soldering paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Refining process of raw material rosin

[0074] Put 1,000g of unrefined Chinese gum rosin with an acid value of 170mg KOH / g, a softening point of 74°C, and a Gardner color of 6, and 500g of xylene into the flask, heat and dissolve, then distill off about 350g of xylene, and then Add 350 g of cyclohexane and cool to room temperature. After about 100 g of crystals were formed by cooling, the supernatant was transferred to another flask and recrystallized at room temperature, then the supernatant was removed, washed with 100 g of cyclohexane, and the solvent was distilled off to obtain 700 g of refined rosin .

[0075] (2) Addition reaction process

[0076]660 g of the purified rosin obtained in (1) above and 100 g of acrylic acid were added to a reaction vessel, and the reaction was carried out at 220° C. for 4 hours while stirring under nitrogen flow, and then the unreacted substances were removed under reduced pressure to obtain 720 g of acrylic acid. into a reac...

Embodiment 2

[0086] (1) Add the refined colorless rosin compound obtained in 100g of Example 1(4), 1g of 1000ppm sodium chloride aqueous solution into the flask, and make it remelt to obtain an acid value of 245.8mgKOH / g, a softening point of 132.0°C, and Refined colorless rosin compound with Dana color 1. The metal content in the refined colorless rosin compound is 10 ppm, and the content of group IA elements and group VIIA elements is 20 ppm.

[0087] (2) Preparation of flux and solder paste

[0088] Except having used 50 parts by weight of the purified colorless rosin-based compound obtained in (1) above, it carried out similarly to Example 1 (5) and (6), and produced the flux and solder paste of this invention.

Embodiment 3

[0090] (1) the refined colorless rosin compound obtained in 100g embodiment 1 (4), 7.2mg iron oxide (Fe 2 o 3 ) into a flask and remelted to obtain a refined colorless rosin compound having an acid value of 245.8 mg KOH / g, a softening point of 132.0° C., and a Gardner color of 1. The metal content in the refined colorless rosin compound is 50 ppm, and the content of group IA elements and group VIIA elements is 0 ppm.

[0091] (2) Preparation of flux and solder paste

[0092] Except having used 50 parts by weight of the purified colorless rosin-based compound obtained in (1) above, it carried out similarly to Example 1 (5) and (6), and produced the flux and solder paste of this invention.

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Abstract

The invention provides a soldering flux of colophony compound (A) containing a metal content below 50ppm and having a conductivity below 1.0uS / cm when being produced into 20% ethanol solution by weight. The invention also provides a soldering paste containing the soldering flux.

Description

technical field [0001] The invention relates to flux and solder paste. Background technique [0002] Flux plays the role of cleaning, anti-oxidation, and promoting wetting of the metal surface to be soldered. Among fluxes, rosin-based compounds are widely used as base agents. As the rosin-based compound, hydrogenated rosin, disproportionated rosin, maleic acid-modified rosin, phenol-modified rosin, and the like are known. However, when these rosin-based compounds are used, depending on the selected rosin-based compound, one of properties such as thermal stability and electrical insulation of the flux is often poor. [0003] As a method of improving the thermal stability and electrical insulation of fluxes using rosin-based compounds, for example, a method of using hydrogenated rosin, disproportionated rosin, or a distilled product of polymerized rosin as a rosin-based compound has been proposed (see Patent Document 1). According to this method, thermal stability and elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36B23K35/26
Inventor 上垣内学冈崎巧岛津大辅宫本拓郎
Owner ARAKAWA CHEM IND LTD
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