The curing process of PU Electronic sealant is a precisely controlled chemical change process, which ensures that the sealant can form a stable and reliable protective layer inside the electronic components. The following are the detailed steps of the curing process of PU Electronic sealant:
Preheating stage:
Before curing, the electronic components to be encapsulated need to be placed in a preheated oven. Usually, the preheating temperature is set to about 60°C for 1-2 hours. The main purpose of this step is to remove moisture from the surface of the electronic components and prepare for the subsequent curing process.
Mixing stage:
After preheating, enter the mixing stage. According to the model and ratio requirements of the PU Electronic sealant used, accurately weigh material A (usually polyols such as polyester and polyether) and material B (usually curing agents such as diisocyanates) and stir them evenly in a mixing container. In this step, the uniformity of stirring is crucial to the subsequent curing effect.
Degassing stage:
After mixing evenly, the mixture needs to be degassed. Place the mixture in a vacuum degassing device and remove the bubbles by reducing the air pressure. The degassing process not only helps to avoid the formation of cavities or bubbles inside the cured sealant, but also improves the density and uniformity of the sealant.
Pouring stage:
After degassing, pouring can be carried out. Pour the degassing mixture evenly into the electronic components to be potted. During the pouring process, it is necessary to pay attention to controlling the pouring speed and flow rate to ensure that the sealant can be evenly filled into every corner of the electronic components.
Curing stage:
After pouring, it enters the curing stage. At room temperature (usually 23°C), PU Electronic sealant takes 3-4 hours to fully cure. During the curing process, the chemical components in the sealant will undergo complex chemical reactions to form a polymer structure, which gives it excellent electrical properties, mechanical properties and weather resistance.
In summary, the curing process of PU Electronic sealant is a complex process involving multiple steps such as preheating, mixing, degassing, pouring and curing. Each step needs to be precisely controlled to ensure that the final sealant can meet the protection requirements of electronic components.
