How to check the bubble phenomenon after curing silicone potting adhesive and solutions

How to check the bubble phenomenon after curing silicone potting adhesive and solutions

 Adhesive products bubble problem is a common phenomenon in the industry products, the need to prevent the emergence of bubbles, it is necessary to develop effective and controllable inspection standard methods, the following methods can check how to check whether the bubbles are eliminated after the silicone potting adhesive is completely cured.

Gel surface

After the silicone potting adhesive is completely cured, if there are bubbles on the surface of the gel, the general phenomenon of bulging, pits, pockmarks, as long as the environment in strong light, it can be easily checked. If there are bubbles on the surface, this will cause the protective properties of silicone potting adhesive, such as moisture-proof, water-proof, etc. to decline, especially in the high moisture environment, the service life is shorter, while the existence of bubbles on the surface, with the extension of time, the impact of environmental alternation, the gel may appear in advance cracking phenomenon, resulting in a series of application problems.

Inside the gel

After the silicone potting adhesive is completely cured, the surface is free of bubbles, does it mean that the curing is normal? The internal bubble is also a key factor in the performance of the impact of the gel, for example, the gel curing speed is faster, the internal bubble is not discharged in time on the surface crust, it will lead to a beautiful flat surface, and the internal bubble of the gel dense, so another point to check the bubble of silicone potting adhesive is to use a blade to cut open the gel for inspection and confirmation, the presence of bubbles in the gel, the physical properties, and electrical properties have a greater impact, such as voltage resistance The presence of air bubbles has a greater impact on physical and electrical properties, such as voltage resistance, voltage breakdown, etc.

Solution

1、After mixing the AB group of silicone potting glue, it is recommended to use vacuum defoaming before the glue filling operation.

2, to prevent the process of gluing operation to produce more new bubbles, especially the high viscosity or fast curing products, gluing to control the height and strength of the gluing.

3, no vacuum conditions, choose the product with good self-bubble removal performance, the glue can be completely defoamed during the operation time.