D-2000
Polyoxypropylenediamine, ~2000 MW (polyetheramine)
- CAS
- Type
- Amine-terminated PPG
- AHEW
- ~514
Used forMain resin in spray polyurea B-sides.
Sold as JEFFAMINE® D-2000 and equivalents; gives polyurea its flexibility and elongation.
Full profileAmines are the fast-acting partners of isocyanates and epoxies. Polyetheramines and aromatic diamines power spray polyurea, aspartic esters make polyaspartics workable, and polyamines cure the world’s epoxies.
Amines contain nitrogen with one or more reactive hydrogens. A primary amine (–NH₂) has two; a secondary amine (–NH–) has one. Those N–H hydrogens react with isocyanate groups to form urea, and with epoxide rings to open them into a crosslinked network.
In spray polyurea, the B-side is mostly long, flexible polyetheramines (D-2000 and T-5000 types) blended with short aromatic diamine chain extenders such as DETDA. The result gels in seconds. Aspartic esters are hindered secondary amines that slow the same reaction to minutes, enabling roll-applied polyaspartic floors.
In epoxy systems, aliphatic, cycloaliphatic and araliphatic amines (TETA, IPDA, MXDA) and modified hardeners such as polyamides, adducts and phenalkamines are matched to the resin by AHEW, the weight of hardener that carries one reactive hydrogen.
Soft-segment resins, chain extenders, aspartic esters and epoxy hardeners. Click any CAS number to copy it.
Used forMain resin in spray polyurea B-sides.
Sold as JEFFAMINE® D-2000 and equivalents; gives polyurea its flexibility and elongation.
Full profileUsed forAdds crosslinking and green strength to polyurea B-sides.
The trifunctional partner to D-2000 in many spray polyurea blends.
Full profileUsed forLow-viscosity, flexible epoxy curing agent.
Same CAS number as D-2000. Chain length is what changes the behavior.
Full profileUsed forFast chain extender in spray polyurea and RIM elastomers.
Sold as Ethacure® 100 and equivalents; drives the very fast gel of aromatic polyurea.
Full profileUsed forChain extender for slower-gel polyurea and cast elastomers.
Sold as Ethacure® 300; slower than DETDA, giving more flow and substrate wet-out.
Full profileUsed forB-side of polyaspartic floor coatings and UV-stable topcoats.
Ester groups and steric hindrance slow the amine–isocyanate reaction enough to roll or squeegee.
Full profileUsed forClear, low-blush epoxy floor and coating hardeners.
Good color stability and chemical resistance in epoxy systems.
Full profileUsed forFast, chemical-resistant epoxy linings and floors.
Cures well at lower temperatures but blushes easily unless adducted.
Full profileUsed forFast room-temperature epoxy cure and adduct manufacture.
Highly reactive and blush-prone; usually used as an adduct rather than neat.
Full profileUsed forEpoxy primers and marine coatings applied in cold, damp conditions.
The hydrophobic cardanol backbone tolerates moisture and cures down to near freezing.
Full profileNitrogen’s lone pair of electrons makes amines strong nucleophiles. Primary aliphatic amines react with isocyanates almost instantly, far faster than alcohols or water, which is why polyurea cures in cold, damp conditions that would ruin a polyurethane. Aromatic amines like DETDA are slower because the ring tugs on that lone pair, and bulky or sulfur-bearing groups (DMTDA) slow them further.
Aspartic esters take this to the extreme: the nitrogen is a secondary amine crowded by ester groups, so its reaction with aliphatic isocyanates stretches from seconds to minutes or longer.
With epoxies, each active hydrogen opens one epoxide ring, so a primary amine can react twice. Stoichiometry is set by AHEW: parts of hardener per hundred parts resin = AHEW × 100 ÷ EEW.
R–NH₂ + OCN–R′ → R–NH–CO–NH–R′Polyurea · secondsR₂N–H + OCN–R′ → R₂N–CO–NH–R′Polyaspartic · minutesR–NH₂ + epoxide → R–NH–CH₂–CH(OH)–Epoxy · hoursphr hardener = AHEW × 100 ÷ EEW
Typical behavior by class. Specific products vary, so always check the TDS.
| Class | Used with | Speed | Strengths | Watch for |
|---|---|---|---|---|
| PolyetheraminesD-2000, T-5000 | Isocyanates (polyurea) | Seconds | Flexibility, elongation | Needs impingement mixing |
| Aromatic diaminesDETDA, DMTDA | Isocyanates | Seconds (DETDA) to slower (DMTDA) | Hardness, green strength | Darkens in UV |
| Aspartic esters | Aliphatic isocyanates | Minutes to an hour | UV-stable, roll-applied | Short pot life, humidity |
| Aliphatic polyaminesTETA, DETA | Epoxy | Fast at room temp | Reactivity, cost | Blush, brittleness |
| Cycloaliphatic aminesIPDA, PACM | Epoxy | Moderate | Clarity, chemical resistance | Slow in the cold |
| Polyamides & phenalkamines | Epoxy | Slow to moderate | Flexibility, cold and damp cure | Darker color |
Many amine curatives are corrosive to skin and eyes and can cause allergic skin sensitization. Some aromatic amines carry additional long-term health hazards listed on their SDS.
Always follow the product’s Safety Data Sheet, your employer’s safety program and local regulations. This page is general reference information, not a substitute for them.
Both form urea links from isocyanate and amine. Spray polyurea uses fast primary polyetheramines and gels in seconds; polyaspartics use hindered secondary aspartic esters with aliphatic isocyanates, giving minutes of working time and full UV stability.
Amine hydrogen equivalent weight: the grams of curing agent that contain one reactive N–H. It is used with the resin’s EEW to calculate epoxy mix ratios.
Amines at the surface of curing epoxy react with carbon dioxide and moisture in the air, forming a waxy carbamate film. Cold, humid conditions make it worse, and it must be washed off before recoating.
DETDA is a short aromatic diamine chain extender. It reacts very quickly with isocyanate to build hard segments, giving spray polyurea its fast gel, green strength and hardness.