Auxillary Chemicals

The reaction of Polyol and isocyanate does not occur only because of these materials chemical properties and thermal energy. There are other products affecting the reaction. They are catalyses. Although it is possible to get a lot of reactions with isocyanate in order to get a certain structure certain catalysts have to be used. Catalysts also play a significant role in the technical properties of the product. For example; the viscosity of the mix, skin formation, cell formation and all the technical properties of the final product. In some cases catalyst combinations has to be used.

Isocyanate and polyols are two main components of Polyurethane. Catalysts on the other hand are additions put in the mix in different amounts in order to get the wanted properties and the right product type.

The reaction between polyol and isocyanate happens faster than the reaction between isocyanate and water. In order to array the cell structure and stabilize the surface weak stabilizers or surface active regulators are used. These are mainly silicons which do not dissolve in water and with low molecular weight

Reaction makers, are catalysts used to fasten mixing reactions and control secondary reactions. (ex. Organotyns, tertiary aminos). Compounds with low molecular weight  and height functionality are also named as reactive and chain maker agents.