What roles do solder paste and rosin play respectively in the process of solder paste production?

Flux paste is a paste-like flux made by mixing rosin and special chemical substances. It has certain activity and acidity, can remove oxides on the solder pad, prevent oxidation during the welding process, reduce the surface tension of materials and solder, improve wettability, and thereby enhance the reliability and quality of welding.BGAFlux paste is often used in chip soldering becauseBGAThe pins of the chip are hidden beneath the chip and solder paste is needed to help the solder flow to the pins. Flux paste can also be used in combination with solder paste or for post-soldering and repair soldering after surface mount technology (SMT) to enhance the strength and reliability of the solder joints.

Rosin is one of the raw materials for making flux paste. It is a solid rosin resin, with rosin acid and sea rosin acid as its main components. Liquid rosin has certain activity and can react with the oxides on the metal surface to form compounds that can be suspended on the solder surface, such as copper rosin acid, etc. Rosin has the characteristics of being non-corrosive and having strong insulation, and it is the most commonly used and best raw material for solder paste. Rosin can also increase the viscosity and stability of solder paste, preventing it from drying out or delaminating.

Flux paste and rosin are different:

Rosin---Solid pine resin, the raw material for making flux and solder paste.

Flux paste---Thick paste, with main components such as isopropyl alcohol, rosin, organic acids, etc. It is used for the soldering of components on electronic circuit boards, removing oxides from the solder pads and facilitating the flow and expansion of solder.

Solder pasteIt is a paste-like viscous body, mainly composed of metal powder, rosin, organic acid, thixotropic agent and active agent. ForSMTWelding in the automatic mounting process. It is an upgraded alternative to flux and soldering process, with a high degree of automation and high soldering accuracy. Solder paste can be printed onto circuit boards on a printing press, then components are placed on the solder paste, and the solder paste is melted and connected to the components through a reflow oven. Solder paste and rosin play a crucial role in the production process of solder paste.

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