Rosin for brazing flux and brazing flux using the same

A technology of flux and rosin, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem that the use of methyl dehydroabietic acid is not known, and achieve excellent washability

Active Publication Date: 2015-03-25
HARIMA CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Methyl dehydroabietic acid contained in the above-mentioned rosin derivatives has a structu

Method used

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  • Rosin for brazing flux and brazing flux using the same
  • Rosin for brazing flux and brazing flux using the same
  • Rosin for brazing flux and brazing flux using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In a four-necked flask equipped with a stirrer, a thermometer, a cooler, a drain pipe, and a nitrogen inlet pipe, add 1000 g of Chinese-made gum rosin (acid value: 165, softening point: 87 ° C, Garner chroma: 7), in a nitrogen atmosphere It was melted at 150°C. Next, while stirring, 0.5 g of p-toluenesulfonic acid was added, and 109 g of paraformaldehyde (concentration: 92% by mass) was added little by little over 2 hours. The paraformaldehyde used was 1.1 mol with respect to 1 mol of rosin. After addition, it heated up to 180 degreeC, and it was made to react for 4 hours, and 1021 g of rosins for soldering fluxes (acid value: 150, softening point: 90 degreeC, Garner chromaticity: 12) were obtained.

[0067] The obtained soldering flux rosin was subjected to GPC analysis and GC-MS analysis. GPC analysis and GC-MS analysis were performed using the equipment described below.

[0068] (GPC analysis)

[0069] Equipment: manufactured by Shodex, GPC101

[0070] Column: m...

Embodiment 2

[0077]Under a nitrogen atmosphere, 700 g of rosin for brazing flux obtained in Example 1 was subjected to vacuum distillation (1 torr), and the main fraction (406 g, acid value: 168, softening point: 84° C., Garner chromaticity :6). As a result of GPC analysis, no nonvolatile dehydration condensate was detected from the recovered main fraction (rosin for soldering flux). Furthermore, GC-MS analysis was performed on the main fraction for qualitative and quantitative analysis. The obtained rosin for soldering flux contained 57% by mass of methyl dehydroabietic acid and 43% by mass of other resin acids. Other resin acids are resin acids derived from Chinese gum rosin as a raw material, such as abietic acid, dehydroabietic acid, and pimaric acid, and resin acids produced by isomerization during the reaction.

Embodiment 3

[0079] 200 g of the rosin for brazing flux obtained in Example 2 was put into an induction stirring autoclave and melted. Next, 2 g of 5 mass % palladium carbon (water content 50%) was added to remove oxygen in the reaction system. Next, hydrogen gas was introduced into the reaction system to pressurize it to 10 MPa, and the temperature was raised to 250° C. while stirring to perform a hydrogenation reaction for 4 hours. After the reaction, the reaction mixture was filtered under pressure to remove the catalyst to obtain rosin for soldering flux (191 g, acid value: 167, softening point: 82° C., Harden color value: 220). The rosin for soldering fluxes is almost colorless, so the Garner color scale was not used but the Harden color value was used. The obtained rosin for soldering flux was subjected to GC-MS analysis for qualitative and quantitative analysis. The obtained rosin for soldering flux contained 55% by mass of methyl dehydroabietic acid and 45% by mass of other resin...

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Abstract

Rosin for brazing flux in the present invention contains methyl dehydroabietic acid and other resin acid except for the methyl dehydroabietic acid, relative to the total of the rosin, the rosin contains 20% to 70% by mass of methyl dehydroabietic acid. Preferredly, relative to the total of the rosin, the rosin contains more than 99% by mass of methyl dehydroabietic acid and other resin acid. In addition, the brazing flux according to the present invention contains the rosin for brazing flux.

Description

technical field [0001] The present invention relates to a rosin for soldering flux capable of suppressing solder spatter, making it difficult to generate voids, and imparting excellent washability to flux. Background technique [0002] Rosin is a nonvolatile component of rosin contained in pinaceae plants, and contains various isomers of diterpene carboxylic acid (resin acid) as a main component. Rosin is a relatively cheap renewable plant resource that can be supplied in large quantities, and can be converted into various derivatives and used in tackifiers, printing ink resins, synthetic rubber emulsifiers, paper sizing agents, and the like. [0003] As a method of derivatizing rosin, a method of reacting rosin and formaldehyde is mentioned, for example. As described in Japanese Patent Application Publication "Japanese Patent Laid-Open 2004-231584" and Jeffery M.McGuire, Richard R. Suchanec, Journal of Chromatographic Science, 32(4), 139-143(1994), it is known that the ros...

Claims

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Application Information

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IPC IPC(8): B23K35/363
CPCB23K35/3612B23K35/362
Inventor 矢野省一柏木慎一郎井上高辅
Owner HARIMA CHEM INC
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