Silicone
adhesive is used in electronic products to seal, fix, fill, etc., but it is
necessary to play its role in the performance of the colloid must be fully
cured, need to ensure that silicone adhesive is fully cured, then in the deep
curing process needs to avoid some factors. I will tell you about the factors
that affect the deep curing of the adhesive.
1. Sizing humidity
Here silicone
adhesive glue is a one-component condensation type of silicone adhesive glue.
Its solidification process is subject to condensation reaction with moisture in
the air, if the lack of moisture or low moisture, all can lead to condensation
reaction speed slow, lead to can't require curing time. For example, in 55%
humidity, 24 h deep 4-5 mm is the thickness of solidified. Since the humidity
in the field environment is only 30%, the curing depth will not reach 4-5mm. If
the required sizing thickness is 4mm, it will not lead to preliminary molding.
2. Sizing thickness
The curing
process of silicone one-component adhesive needs to go through several stages
of surface drying, skinning, deep curing, initial overall curing, and complete
curing. Under the same environmental conditions, the thickness
of the glue is thicker, the curing phase completion time is longer, deep curing
mainly takes time, the more thick, the harder it is for the internal liquid
glue to contact the air, curing duration will be extended. Therefore, the same
type of product, the same environment, different sizing thickness, the required
curing time are also different.
3. Sizing performance
Colloid
performance, what we want to explain here is the curing speed or strength.
Generally, the faster the surface drying speed, the stronger the curing
strength of the adhesive, the overall curing speed will be relatively fast. When
choosing a fast-curing silicone adhesive, you can be based on the dry time and
skin time for reference selection.
Therefore, it
is very important to understand the significance of deep curing of silicone
one-component adhesives, which can avoid and prevent the phenomenon that the
internal colloid does not cure when the product reaches the end customer.