Preperation And Performance Of Rosin Derivatives For Flux

Rosin is one kind of natural resins, and its primary component is three-ring terpenoids resin acid. Excellent insulating property and low corrosiveness make rosin to be a good flux material used in soldering. In this thesis, the performance of common rosin(masson pine rosin) and its modified products(hydrogenated rosin, refined hydrogenated rosin, disproportionated rosin and polymerized rosin) as flux to Sn37 Pb, Sn0.7Cu and Sn3.0Ag0.5Cu solder alloys was investigated. Then maleopimaric acid polyglycol ester(MPE), maleopimaric acid alcohol amine ester(MAAE), and monodehydroabietyl dibasic acid ester(MDAE) were synthesized, and their performance as flux was researched as well.Liquid flux with 25% content of masson pine rosin or modified rosins have good physical stability and the degree of dryness. Their copper corrosiveness are low and surface insulation resistance(SIR) are higher than 1×108?. Masson pine rosin and hydrogenated rosin showed good wettability to the three solder alloys, and refined hydrogenated rosin is fit for Sn0.7Cu just; wettability of disproportionate rosin are almost to refined hydrogenated rosin when Sn37 Pb was used, however, to lead-free solder alloys, its inferior to refined hydrogenated rosin. Among all products, polymerized rosin demonstrates the worst wettability.The MPE with kinds acid values were prepared by maleopimaric anhydride and PEG(200, 400, 600, 800) when ZnO was used as catalyst. Final products were characterized by ATR-FTIR and performance of MPE-based fluxes(25% content) were also investigated. Results showed that MPE based fluxes are eligible on physical stability, and their copper corrosiveness are low, and higher SIR(higher than 1×108?). Spreading ratios of MPE200(1:1.0) to Sn0.7Cu and Sn3.0Ag0.5Cu were 78.8% and 78.5% respectively, It satisfies the M level requirement described in SJ/T 11389—2009, and is better than rosin and modified rosins, what more, the macroscopically appearance of welding spots are superior too. Similarly, MAAE with kinds acid values were prepared by maleopimaric anhydride and alcamines compounds, such as triethanolamine(the production named MTE), N-ethyldiethanolamine(the production named MNE) and 2-diethylaminoethanol(the production named MDE). It showed that MAAE based fluxes are eligible on physical stability and dryness, and their copper corrosiveness are low, SIR are higher than rosin and modified rosins. Spreading ratios of MTE(1:1.5) and MTE(1:2.0) to Sn0.7Cu are 81.4% and 82.2%, it satisfies the H level requirement described in SJ/T 11389—2009, however the macroscopically appearance of welding spots are less than satisfactory.MDAEs were synthesized through purification, reduction and acylation reactions of dehydroabietic acid, including maleic acid monodehydroabietyl ester(MAME), succinic acid monodehydroabietyl ester(SAME) and glutaric acid monodehydroabietyl ester(GAME). The molecule structure of MAME, SAME and GAME were examined by ATR-FTIR, 1H NMR and MS. Performance of MAME, SAME or GAME based fluxes(25% content) were investigated, and the results showed that MAME, SAME or GAME based fluxes are eligible on physical stability and dryness, and their copper corrosiveness are low, SIR are higher than 1×108?. These compounds are all suitable for Sn37 Pb, Sn0.7Cu and Sn3.0Ag0.5Cu solder alloys. Spreading ratios of MAME, SAME and GAME based fluxes to Sn0.7Cu are all 80% above especially, it satisfies the H level requirement described in SJ/T 11389—2009, furthermore the macroscopically appearance of welding spots are remarkably well.