How To Ensure Effective Adhesion of Silicone Sealant?

Since the invention of silicone sealant, after nearly 80 years of development, the types of silicone sealant have been very rich. When choosing sealant, the compatibility of sealant and substrate should be put in the first place, and the appropriate sealant should be selected according to the different substrate.

1. A clean substrate surface is very important

The presence of dust and dirt will reduce the contact area between the adhesive and the substrate surface, which may cause stress concentration when stressed, thus causing the sealant to destroy in advance; Oil pollution may cause the sealant to dissolve and fail; Rain, snow and frost may cause the sealant to fail to stick. Therefore, try to clean the substrate before sizing, so that it is clean and dry, so that the sealant can fully stick.

2. Apply primer as needed

Usually silicone sealant has a good bond to many materials. However, with the advancement of technology, the surface treatment methods of aluminum profiles are endless, and even the similar architectural aluminum profiles produced by different manufacturers will show significant differences in cohesiveness due to different levels of technology or production control. In this case, don't worry, just apply the primer according to the material.

Primer, also known as primer, is composed of different solvents and coupling agents, for aluminum profiles, solvents play a certain cleaning ability, coupling agents on the surface of the profile to play a modified role, thereby enhancing the sealant and the bonding force between the profile.

3. The glue seam setting should be reasonable

When gluing, in addition to paying attention to the width and depth of the glue to be reasonable, but also to avoid three-sided bonding, this is because the three-sided bonding will seriously affect the displacement capacity of the sealant, resulting in excessive internal stress and cracking.

4. Can not be used in waterlogged environment

Although the curing of silicone sealant is inseparable from the participation of water, because of its structural composition, it can not be immersed in water for a long time, because it will dissolve and extract the sealant composition for a long time, change the composition of the sealant, and its performance will inevitably be reduced.

5. Protect before fully curing

No matter what kind of sealant, it is very fragile when it is not fully cured, and its durability and weather resistance are very strong after it is fully cured, and various excellent properties can be played out. Therefore, sealant stress should be avoided as far as possible during sizing to complete curing.

In order to smooth sizing, please carry out compatibility and adhesion test before purchasing glue; Small area gluing experiment was carried out before large amount of gluing. Check at fixed intervals during use.