The catalysts commonly used in the polyurethane foaming process mainly include the following:
Tertiary amine catalysts: This type of catalyst is widely used in polyurethane synthesis. Common varieties include triethylenediamine, dimethylethanolamine, N-methylmorpholine, N,N-dimethylcyclohexylamine, etc. Tertiary amine catalysts promote the reaction in the polyurethane foaming process and are suitable for various polyurethane foam systems.
Organotin catalysts: This type of catalyst includes stannous octoate, stannous oleate, dibutyltin dilaurate, etc. Organotin catalysts have high activity in polyurethane synthesis and are often used to improve reaction rate and product quality.
Acid catalysts: Although not as common as tertiary amine and organotin catalysts, they are also used in some specific applications, such as trimerization catalysts and equilibrium reaction catalysts.
These catalysts have their own advantages and disadvantages in polyurethane synthesis. Choosing a suitable catalyst can improve production efficiency and product quality. For example, tertiary amine catalysts have high activity but are easily volatile; while organotin catalysts have low activity but good stability and are suitable for systems that require long reaction times.