How to Accelerate the Gel Time of Polyester Resin?

There are several methods to accelerate the gel time of polyester resin, but it is important to consider your specific situation in order to identify the most suitable solutions.

Firstly, temperature is a key factor affecting the gel time of resin. Generally speaking, the higher the ambient temperature, the faster the curing reaction occurs, thereby shortening the gel time. For instance, polyester resin tends to cure quicker when the temperature rises. If heating conditions are not available, using portable heating devices can be an effective alternative. Preheating the resin before adding the hardener is also advantageous.

Secondly, the type of hardener directly influences the gel time of the resin. For example, increasing the amount of MEKP hardener can quicken the curing process in cold weather. However, it is important to note that this approach can render the product more brittle and reduce its yellowing resistance. Alternatively, using a hardener like MEC performs well even in lower temperatures without needing to increase the dosage significantly.

Thirdly, additional additives can also help speed up the gel time of polyester resin. For instance, when working outdoors during winter, adding a small amount of dimethyl aniline can effectively reduce gel time; however, care must be taken not to exceed the recommended dosage, as excessive amounts can lead to brittleness and a decrease in strength.

In summary, having strategies to address the issue is better than having none. Assess your situation and implement feasible and effective measures to accelerate the gel time of polyester resin.