What are the key factors that affect the curing speed of sealant?

Sealants are widely used in many construction fields such as curtain walls, doors, windows, and interior decoration to play the role of bonding and sealing. The curing speed of the sealant directly affects the progress of the construction. So what are the key factors that affect the curing speed of sealant?

When it comes to the curing of sealant, we must first understand its curing principle. Taking single-component sealant as an example, the sealant absorbs moisture in the air and reacts with the moisture in the air in an open and ventilated environment. and inside, gradually solidifying. The reaction process between sealant and air is affected by the following factors.

1. Ambient temperature

The curing process of sealant is actually a chemical reaction process, and the ambient temperature has a great impact on the speed of the reaction. Whether it is a single-component sealant or a two-component sealant, the higher the ambient temperature, the faster the reaction speed and the faster the curing speed. For single-component sealants, when the temperature is lower than 15°C, the curing speed will significantly decrease and the curing time will be extended accordingly. Therefore, in summer and winter, everyone can clearly feel the difference in the curing speed of sealant. In winter, the curing time is longer, and the maintenance time of sealant also needs to be extended.

2. Environmental humidity

During the curing process of sealant, in addition to the ambient temperature, water molecules in the air are also a key factor in the reaction. For one-component sealant, it needs to absorb moisture in the air during the curing process, so the higher the air humidity, the faster the curing speed will be. If it is in the northern region in autumn and winter, the weather is dry and the humidity is low, the curing speed of the sealant will be significantly slower. It is recommended to appropriately extend the curing time after the sealant is applied, and at the same time, avoid causing large stress on the sealant joints after the sealant is applied. Causes the sealant seam to deform.

3. Contact area

When the sealant is cured, it needs to absorb moisture in the air, so the contact area between the sealant and the air will also affect the curing speed, especially when the single-component sealant is applied to non-porous substrates (such as glass, aluminum, metal, etc.). Only one side of the sealant can contact the air, the other three sides are basically airtight, and the reaction speed will be appropriately prolonged. Because the larger the effective contact area between the sealant and the air, the more moisture it can acquire, the faster the chemical reaction rate, and the faster the curing speed.

4. Ventilation environment

The small molecular substances released during the curing process of the sealant will gradually accumulate and the concentration will continue to rise. If the concentration rises to a certain level in a completely sealed environment, it will prevent the curing reaction from proceeding, resulting in insufficient curing of the sealant, thus affecting the performance of the sealant. Sealant performance. Therefore, it is recommended that sealant construction must be carried out under ventilated conditions and cannot be in a completely closed environment during its curing process.

I hope that through this article, everyone can have a better understanding of the curing process of building sealant and some factors that affect the curing speed, and it will be more helpful to the construction process and continuously improve the construction efficiency.