High-temperature drying of flame retardants
in industrial scale In the production of flame retardants, a low residual water content in the ppm range plays a decisive role. AVA has developed a flame retardant dryer that enables the reliable and efficient production of flame retardants in batch sizes up to 20.000 liters.
Many plastic materials are hydrophobic. If water molecules are trapped in the polymer matrix, they will not bind to the polymer and have a negative impact on the mechanical properties of the material. Therefore, flame retardants added to the plastic products shall have possibly low moisture content; often the specification is to reach ppm level. To reach such low moisture content within reasonable drying time, the vacuum drying process shall be carried out under high vacuum and the product temperature shall be as high as the product allows. For some organophosphorus compounds for example, process temperature over 300 °C is not unusual.
The AVA HTC-VT type vacuum dryer can be well adapted to this application. The
