The main factors affecting the thickening speed of silicone coating layer include the thickness of the glue layer, environmental humidity, ambient temperature, colloid properties, curing agent usage and operating process, etc. The following is a specific analysis:
Glue layer thickness: When the silicone glue is thicker, the deep glue layer cures more slowly, and the overall curing time increases, which in turn affects the thickening speed. This is because it is difficult for the thicker glue layer to quickly contact the humid air, resulting in a delay in the curing process.
Ambient humidity: Under the same ambient temperature, the higher the humidity, the faster the silicone colloid cures. Humidity is an important factor affecting the vulcanization reaction speed of silicone, and a high humidity environment can promote the curing process of silicone.
Ambient temperature: The higher the temperature, the faster the silicone glue layer cures. Under the same ambient humidity, increasing the temperature can accelerate the vulcanization reaction of silicone, thereby accelerating the thickening speed. However, it should be noted that excessively high temperatures may also cause changes in silicone properties, which need to be adjusted within an appropriate range.
Colloid properties: The surface drying speed and curing strength of silicone will affect the overall curing speed. The faster the surface drying speed and the stronger the curing strength of silicone, the faster the overall curing speed, which is conducive to the improvement of the thickening speed.
Curing agent usage: Improper curing agent addition (such as adding too much or too little) will affect the curing speed of silicone. In addition, different types of curing agents cannot be mixed, otherwise the silicone may not cure or cure incompletely.
Operation process: including whether the stirring is uniform and whether the operating environment temperature is suitable. The silicone and curing agent need to be fully stirred, especially the silicone at the bottom of the container. The temperature of the operating environment must also be controlled within an appropriate range (such as 20℃-30℃) to ensure that the silicone can cure normally.