Polyoxypropylenediamine, ~2000 MW (polyetheramine)
The main resin in most spray polyurea B-sides. D-2000’s long, flexible chain ends in amines that react with isocyanate in seconds.
D-2000 is a polyoxypropylenediamine: a polypropylene glycol backbone of about 2,000 molecular weight with primary amine groups at both ends. It is sold as JEFFAMINE® D-2000 and equivalent products from other suppliers. Its AHEW is about 514 g/eq.
In spray polyurea the B-side is typically a blend of long polyetheramines such as D-2000 (and trifunctional T-5000) with short aromatic diamine chain extenders. D-2000 forms the soft segment, giving polyurea its flexibility, elongation and crack-bridging ability.
Primary aliphatic amines react with isocyanates far faster than hydroxyl groups, so no catalyst is needed and gel times are measured in seconds. The polyether backbone is hydrophobic enough for good water resistance but, like other polyethers, can oxidize under UV. In polyurea, each NH₂ group typically reacts with one NCO group.
Polyetheramines can irritate or damage skin and eyes and may cause sensitization. Wear chemical-resistant gloves and eye protection, and keep containers closed to limit CO₂ and moisture pickup.
Its amine end groups react with isocyanate within seconds without catalyst, which is what defines polyurea and allows thick, fast-setting spray films.
Yes. Both are polyoxypropylenediamines with the same CAS number; they differ in chain length and therefore properties.
