High-reliability low-temperature lead-free solder paste and preparation method thereof
A lead-free solder paste, reliable technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of poor thermal fatigue reliability, easy to fall off solder joints, poor wettability, etc., to achieve thermal fatigue resistance Good performance, less post-soldering residue, continuous and smooth printing process
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[0019] Example 1:
[0020] Weigh 0.35 kg of triethylene glycol methyl ether, 0.47 kg of rosin, 0.05 kg of malonic acid, 0.07 kg of suberic acid, and 0.06 kg of hydrogenated castor oil. Add triethylene glycol methyl ether into the container, raise the temperature to 100°C, and stir for 3 minutes. Then add the rosin, disperse the rosin with a high-speed disperser, and dissolve it in the solvent. After the solution is clear and transparent, cool to 90℃, add malonic acid and suberic acid, and disperse with a high-speed disperser for 8 minutes to make the active agent Disperse fully in the liquid, let stand for 5 minutes, then add hydrogenated castor oil, disperse with a high-speed disperser to dissolve the thixotropic agent in the flux, and then take out the dispersing head and let it stand for 8 hours to obtain the desired Of flux.
[0021] Stir the flux with a spatula for 1 minute, and then weigh the flux and solder powder in a weight ratio of 90:10. Put the weighed flux into the ...
Example Embodiment
[0022] Example 2:
[0023] Weigh 0.18 kg of propylene glycol methyl ether, 0.24 kg of ethylene glycol ethyl ether, 0.44 kg of rosin, 0.05 kg of glutaric acid, 0.03 kg of citric acid, and 0.06 kg of ethylene bis-stearic acid amide. Add propylene glycol methyl ether and ethylene glycol ethyl ether into the container, raise the temperature to 95°C, and stir for 4 minutes. Then add rosin, disperse the rosin with a high-speed disperser, and dissolve it in the solvent. After the solution is clear and transparent, cool to 80℃, add glutaric acid and citric acid, and disperse with a high-speed disperser for 5 minutes to make the active agent full Disperse in the liquid, let stand for 10 minutes, then add ethylene bisstearic acid amide, disperse with a high-speed disperser, so that all the thixotropic agent is dissolved in the flux, then take out the dispersing head and let it stand for 10 hours to obtain the The flux required for the invention.
[0024] Stir the flux with a spatula for 3 ...
Example Embodiment
[0025] Example 3:
[0026] Weigh 0.38 kg of ethylene glycol methyl ether, 0.41 kg of rosin, 0.15 kg of adipic acid, 0.02 kg of methyl hydrogenated castor oil, and 0.04 kg of ethylene bis-stearic acid amide. Add ethylene glycol methyl ether into the container, raise the temperature to 90°C, and stir for 5 minutes. Then add rosin, disperse the rosin with a high-speed disperser, and dissolve it in the solvent. After the solution is clear and transparent, cool to 85°C, add adipic acid, and disperse with a high-speed disperser for 10 minutes to fully disperse the active agent in the liquid Then, let it stand for 3 minutes, then add methyl hydrogenated castor oil and ethylene bisstearic acid amide, and disperse with a high-speed disperser to dissolve the thixotropic agent in the flux, then take out the dispersing head and let it stand for 12 hours. The flux required by the present invention is obtained.
[0027] Stir the flux with a spatula for 2 minutes, and then weigh the flux and so...
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