The amount of polyurethane catalyst used will vary depending on the type of polyurethane used, the properties desired in the finished product and the specific application. Generally speaking, the amount of catalyst used ranges from 0.1 to 5% of the total weight of polyurethane.
The type of polyurethane can affect the amount of catalyst used in several ways. First, the functionality of the polyol affects the reaction rate. Polyols with higher functionality react more slowly, so they will require higher dosages of catalyst. Second, the isocyanate index of the polyurethane affects the reaction rate. Isocyanates with higher isocyanate index react more quickly and therefore require less catalyst.
The desired properties of the finished product will also affect the amount of catalyst used. For example, lower catalyst dosages can be used if soft and elastic polyurethane is desired. If rigid polyurethane is desired, higher catalyst dosages will need to be used.
The specific application will also affect the amount of catalyst used. For example, if polyurethane is used to make a foam, a higher dosage of catalyst will be used than if polyurethane is used to make a coating.
The amount of catalyst to use can be determined by trial and error or by consulting a polyurethane specialist. It should be noted that the amount of catalyst used may need to be adjusted according to the specific conditions of the application.
