Why does solder paste tend to dry out easily during PCBA processing?

Solder pasteinPCBASolder paste is an important raw material in the production and processing of surface mount technology (SMT), playing an indispensable role in SMT soldering. Generally, solder paste is a paste-like solder made by uniformly mixing alloy powder, paste-like flux paste and other carriers. SometimesPCBAThe factory found that the solder paste dried out easily during the production and processing. So, what's going on here? Below, Shenzhen JJY Solder Paste Manufacturer will briefly introduce to you some reasons why solder paste dries out:

In the reflow soldering process, solder paste is prone to drying out, resulting in the solder paste not melting. The solder paste fails to cover the solder joints, resulting in poor soldering of the solder joints and other phenomena. Because a small amount of solder paste is more likely to conduct heat, and high temperature precisely makes it more difficult for the solder paste to melt. This situation can be inPCBAIn the reflow soldering process of surface mount technology, the temperature curve can be adjusted to solve the problem, or the soldering can be carried out in a nitrogen environment.

The reason why solder paste is not easy to melt might also be that it contains too much flux paste, and this can also lead to the phenomenon of solder paste drying out easily. In realityPCBAThe most commonly used solder paste in processing should be rosin. Since rosin contains a large amount of rosin acid, rosin acid is prone to lose its activity in high-temperature environments, so inPCBAIn the soldering process of surface mount technology, the general temperature is usually at200℃Left or right. It won't be too high. At the same time, the quality of the thixotropic agent can also cause the solder paste to dry out easily. Poor quality of the thixotropic agent will affect the viscosity of the solder paste. If the viscosity is high, the solder paste will dry out easily.

Apart from the above two points,PCBAEnvironmental factors such as the usage environment, humidity and temperature of the processed solder paste can also affect the solder paste, and even lead to the phenomenon of it drying out without melting during use.

As a 16-year-old veteran solder paste manufacturer, JJY has been committed to the research and development, production and sales of solder paste. The solder paste we produce is of stable quality, without solder connection, false soldering or monument erection. No residue, Wuxi beads, bright, full, firm solder joints with excellent electrical conductivity. If you have any needs, please feel free to contact us.