Tri-iso distributes a wide range of aromatic isocyanates that allow formulators to produce high quality polyurethane and polyurea adhesives. Isocyanates contain reactive NCO groups which react with hydroxyl groups on polyols to form polyurethanes and with amines on polyamines to form polyureas. Aromatic isocyanates are isocyanates where the NCO group is directly attached to an aromatic ring. Aromatic isocyanates are used in applications where color stability and UV resistance are not necessary. Consequently, aromatic isocyanates are often used to produce polyurethane and polyurea adhesives that will be used in indoor applications, for primers, foam, and elastomers.
There are several key characteristics which define what performance properties a given aliphatic isocyanate will impart in a given polyurethane system. These characteristics include: the NCO equivalent weight, the %NCO, and the functionality of the isocyanate.
NCO equivalent weight is the number of grams of a given product that contains one equivalent of isocyanate groups (NCO). One equivalent of NCO groups is 42.02 grams/mol
%NCO = 4202/NCO equivalent weight.
Isocyanate functionality refers to the number of NCO groups per molecule. Increasing the number of NCO groups results in greater crosslinking. Greater crosslinking yields stiffer, harder products with enhanced chemical and thermal resistance.
Tri-iso distributes aromatic isocyanates based on Methylene diphenyl diisocyanate MDI and toluene diisocyanate (TDI), Tri-iso also distributes blocked aromatic isocyanates to produce 1K stable polyurethane and polyurea adhesives.
Your Tri-iso Technical Sales Representative is available to assist you in the selection of the appropriate aromatic isocyanates that will provide the specific properties you are trying to obtain. Click here to request a quote.