What Are The Common Problems of Using Silicone Sealant for Doors And Windows?

Sealant in doors and Windows is mainly used for the joint sealing of window frame and glass, the joint sealing of window frame and internal and external walls, and plays a key role in the water tightness, air tightness, insulation, sound insulation and other aspects of doors and Windows. Problems in the application of sealant for doors and Windows will lead to seal failure of doors and Windows, resulting in water leakage, air leakage and other problems, seriously affecting the overall quality of doors and Windows. This issue introduces some common problems in the application process of sealant for doors and Windows, and provides solutions to help users use sealant well by analyzing the reasons. First of all, we will introduce three common problems: incompatibility, poor bonding, storage problems.

1. Incompatible with substrate

Some of the accessory materials used in the assembly of doors and Windows, such as rubber materials (rubber pads, rubber strips, etc.), usually have close contact with the sealant. However, some rubber products may be due to manufacturers in order to reduce costs or other considerations, will add rubber oil or other small molecular substances incompatible with the sealant system. When such rubber products are in contact with silicone sealant, rubber oil or other small molecular substances will migrate to the sealant, and even migrate to the surface of the sealant, during the use of sunlight under the action of ultraviolet light, may lead to yellowing of the sealant, this phenomenon is more obvious on the light color of the door and window glue.

Therefore, we recommend that before the construction of sealant, according to the compatibility test method, the compatibility test of sealant and the material in contact with, determine the compatibility of sealant and the substrate, and carry out construction in accordance with the requirements of the compatibility test results.

2. Poor bonding

In the application of door and window adhesive, the substrate that may be contacted is glass, aluminum, cement mortar, tile, wall paint, etc. There is likely to be oil, dust or other residual substances on the surface of these materials, and if the adhesion is not confirmed before construction, it may cause poor adhesion of doors and Windows. For example, the sealant on a door and window does not stick to aluminum, the main reason is that there may be some oily substances on the surface of aluminum, and the direct gluing without cleaning affects the bonding effect of the sealant and aluminum.

If the silicone sealant is used at the joint between the door and window and the external wall of the cement mortar, the dust and sand on the surface of the external wall of the cement mortar are not cleaned up and are directly glued, it is likely that the sealant will not stick to the external wall of the cement mortar after curing.

Therefore, in the actual process of using glue, it is necessary to pay attention to the pretreatment of the surface of the substrate to be glued, and use the appropriate method to remove the oil, dust, sand, and loose layer that is easy to fall off on the surface of the substrate to be glued, so that the sealant and the substrate can achieve the ideal bonding effect.

3. Sealant storage problem

Sealant products belong to chemical products, have a certain period of storage, required to be used during the storage period. If the sealant has exceeded the storage period, it is likely to cure significantly slower, poor curing or even no curing.

According to the storage conditions requirements in the sealant related standards, the nominal storage period of the sealant is stored below 27 ° C and under cool, dry and ventilated conditions. If the actual use of the storage environment can not meet the standard conditions, such as the ambient temperature is too high, the sealant storage period may be shortened, under this condition, even if the sealant does not exceed the nominal storage period, there will be slow curing phenomenon.