When using silicone sealants, it is
possible to experience problems such as peeling, cracking, or incomplete
curing. The reason is directly related to the operation method. The operation
method is incorrect, which directly affects the curing and performance.
The silicone sealant is used as follows:
1. The one-component product can be
operated directly with a glue gun; the two-component silicone glue needs to be
mixed evenly in proportion.
2. Clean the surface of the bonding object,
and clean up oil, rust, etc. If necessary, professional cleaning agents can be
used, and then appropriate sanding with sandpaper can be used to improve
adhesion.
3. Apply the silicone sealant evenly to
bond. When bonding the two surfaces, squeeze out the air to avoid affecting the
curing effect.
4. Curing at room temperature, and the next
step can be performed after a period of time.
5. Wipe off the excess adhesive with a rag
or paper towel, and clean it with a blade after curing.
The following operations should be avoided
during the use of silicone sealants:
1. Not suitable for long-term immersion in
water, so as not to affect the adhesion of the adhesive.
2. It cannot be used on surfaces that are
too wet or prone to frost, and cannot be bonded normally.
3. One-component silicone sealant cannot be
cured in a completely sealed environment, and may not be completely cured.
4. The surface of the substrate must be
kept clean and dry, otherwise it cannot be firmly bonded.
5. Do not use inferior adhesives, so as not
to corrode other parts.
The curing of silicone sealant has
environmental restrictions. Generally speaking, in the range of 5~40℃, normal
construction can be carried out. When the surface temperature of the substrate
is higher than 50℃, please stop the construction. If the construction is
continued at this temperature, although the curing speed will be accelerated,
at the same time, the small molecular products will not be discharged in time,
resulting in the formation of bubbles. When the temperature is too low, the
curing speed will slow down, shrinkage may occur, and the adhesive layer will
be out of shape.
Silicone sealants are not suitable for all
occasions, such as places that have been soaked in water for a long time,
frosted or too humid, and the surface of the substrate is not clean enough, and
it is not easy to bond with oily materials.
The quality inspection of silicone sealant should be considered from the following aspects:
1. Performance
When purchasing an adhesive, read a series
of properties at first glance to see if the performance of the adhesive meets
the needs of use. Looking at the shelf life, the better the adhesive, the
longer the storage time in a specific environment.
2. Look at the production date
Each batch of adhesive has a fixed
production date. Expired products cannot be purchased. After the expiration
date, all aspects of the adhesive will decline, which is not suitable for
long-term use.
3. Try by hand
Take the overflowing adhesive in your hand,
pinch and pull, if the elasticity and softness are good, the quality is good,
if it feels hard and brittle, there may be some quality problems, and you need
to be vigilant. At the same time, observe whether there are particles and
bubbles in the colloid. If there are, it will affect the mechanical properties
of the colloid after curing.
