What Exactly is Polyurea?
The Polyurea Development Association (PDA), the polyurea industry’s trade association has developed a “formal definition” to help suppliers, engineers, specifiers and contractors differentiate between real polyureas and other materials that “claim” to be polyureas.
The PDA has also sponsored a program to allow suppliers to use a “Pure Polyurea” logo on there materials, if they meet this criteria. The Pure Polyurea Product Certification logo is the property of the PDA. It can ONLY be used with the written permission of the PDA pending a self certification by a manufacturer stating that their products meet the PDA’s definition of a pure polyurea. Specific usage guidelines also apply.
PDA - Polyurea Definition
A polyurea coating / elastomer is that derived from the reaction product of an isocyanate component and a resin blend component. The isocyanate can be aromatic or aliphatic in nature. It can be monomer, polymer, or any variant reaction of isocyanates, quasi-prepolymer or a prepolymer. The prepolymer, or quasi-prepolymer, can be made of an amine-terminated polymer resin, or a hydroxyl-terminated polymer resin.
The resin blend must be made up of amine-terminated polymer resins, and/or amine-terminated chain extenders. The amine-terminated polymer resins will not have any intentional hydroxyl moieties. Any hydroxyls are the result of incomplete conversion to the amine-terminated polymer resins. The resin blend may also contain additives, or non-primary components. These additives may contain hydroxyls, such as pre-dispersed pigments in a polyol carrier. Normally, the resin blend will not contain a catalyst(s).
Polyurea is a remarkable technology with a range of uses limited only by your imagination. As with any coating system, proper surface preparation, correct application equipment and the use of compatible primers is required. Read on to see where and how polyureas are being used successfully around the globe.