Causes and effects of settlement of potting compound

Encapsulation of electronic components with silicone potting compound is the process of using equipment or manual means to pour two rtv silicone potting compound into electronic products containing electronic components and circuits, and curing them at room temperature or heating conditions to become high-performance thermosetting polymer insulation materials. During the use of silicone potting material, settlement problems are often encountered, and many people do not know the reasons, so it is difficult to find a solution to the problem. Today, the editor will explain the reasons and effects of potting compound settlement to everyone.

In fact, the settlement of potting compound is similar to the phenomenon of delamination and agglomeration of potting compound. The layering of potting adhesive is mainly reflected in the storage process, which is caused by certain material characteristics in its components. The longer the storage time, the more obvious the layering, and the main method to solve it is to thoroughly stir. The main reason for the caking of sealing adhesive is that it is not evenly dispersed during the mixing process, resulting in caking existing in the adhesive liquid and easier to settle.

Firstly, Schneider informs everyone that the composition of potting compound is mainly composed of silicone oil, powder, additives, etc; The occurrence of sedimentation is due to differences in the density of these materials. Over time, those with high density begin to sink. This is why when you open the lid of the sealing rubber barrel, you see a transparent oil layer on the upper layer and a powder layer on the lower layer. Especially after storage at high temperatures, the higher the temperature, the lower the viscosity of silicone oil, and the faster the powder settles, resulting in a shorter settling time. Therefore, storage temperature is also one of the reasons for the settlement of potting compound.

What are the effects of the sedimentation of the two component potting compound? If the two components are thoroughly stirred before use, and then mixed together, the performance will not be affected. However, if not stirred evenly, it will cause differences in the density of each component, resulting in differences in weighing. The cured performance will also have varying deviations from normal performance, and it will also cause viscosity to increase after use, which not only has a significant impact on performance but also has a significant impact on operability, So before using the two component potting compound, it needs to be thoroughly stirred and evenly mixed.

Summarize the influencing factors of settlement phenomenon in potting adhesive, mainly reflected in uniform production mixing, improper powder storage, severe moisture absorption, and difference in oil powder solubility.