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The important role of adding surfactants in solder paste

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Update time : 2022-09-09 10:49:49
Surfactants are very common in our production and life, such as our common styrofoam, the foam used for shaving, and also in detergents. It is added in the industry, and it also exists in personal care products. Of course, this substance is also necessary in lead-free solder paste. Because the surface tension of the metal to be soldered needs to be improved, the solder paste manufacturer adds a small amount of active agent. It can make the product have good moisturizing performance and speed up the welding process. Surfactants are composed of two ions with completely opposite physical properties. The two ends of the active agent have different chemical properties, one end is extremely hydrophilic, and the other end is extremely lipophilic. After the active agent is dissolved in water, it can reduce the tension of the water surface and increase the The solubility of other compounds in this water. The application range of surfactant is very wide, and it is also added in solder paste. Surfactant mainly provides the effect of foaming and modification. Next, the lead-free solder paste manufacturer will analyze why the surfactant is added to the solder paste, and which performance of the solder paste will be greatly improved after adding the active agent.
       Surfactants are widely used, and are often used as additives in the formulation of materials in personal care and industrial production, such as our common metal surface treatment, industrial washing, and the extraction and use of liquid natural resources such as petroleum. into agriculture to make pesticides. The active agent is mainly composed of two ions, a hydrophilic group and a hydrophobic group. From the structure, it can be seen that the active agent is amphiphilic. The active agent has different hydrophilic and lipophilic properties in its structure. These two properties are at both ends of the active agent, and the molecules are arranged at both ends, so that the surface element of the two ends can be freely transferred to the interior of other molecules. In this way, the surface tension of the metal part to be welded is reduced during the welding process of the solder paste manufacturer's products. Since the two ends of the active agent have completely different element, inserting one end into the contact surface is equivalent to using a knife to cut it. open, destroying the metal surface for soldering with solder paste. The two ends of the active agent molecule are not in contact with the metal to form a new interface. The active agent eliminates the interface between the two phases, which can reduce the surface tension and free energy of the metal. Solder paste manufacturers use active agents in lead-free solder pastes because of their ability to reduce the surface tension and free energy of metals.
       The active agent used by lead-free solder paste manufacturers also takes advantage of the adsorption of this material. Adding a little active agent to the solder paste can not only increase the wettability and lubricity of this product to the circuit boards and electronic components to be soldered , but also increased the adsorption of solder paste. Solder paste manufacturers add a small amount of active agent to prevent defects such as collapse and welding short circuit during the soldering process using SMT solder paste.
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