DHK E300 (DMTDA, Ethacure 300)
Similiar to Ethacure 300
Curing agent
DHK E300 (DMTDA, Ethacure 300)
Equivalent Weight | 107 |
Appearance | Amber Liquid |
Odor | Slight Amine |
Boiling Point°F(°C) | 667(353)(ecomposes) |
Density(g/cm3)at 68°F(20°C) | 1.21 |
140°F(60°C) | 1.18 |
212°F(100°C) | 1.15 |
Viscosity,Cps at 68°F(20°C) | 690 |
140°F(60°C) | 22 |
212°F(100°C) | 5 |
Vapor Pressure, mmHg at 65°F(20°C) | 0.6 |
Amine Number,mg KOH/g | 536 |
TDA content (%) | ≤1.0% |
Moisture | ≤0.1% |
Processing:
DHK E-300, being a liquid at room temperature results in significant processing advantages, for example, in such
operation as transfer, melting down of solids is eliminated. Also, the possibility of freezing-up is no longer a concern duringmixing or in meter-mixing machines. Additionally, its liquid state permits processing prepolymer at lower temperatures than that of MOCA.
DHK E-300 has an equivalent weight of 107 compared to 133.5 for MOCA. This means that about 20% less by weight is required for a given prepolymer at the same stoichiometry.
Example:
Prepolymer (NCO 4.1) | 100Pts | 100Pts |
MOCA @ 95% Theory | 12.4Pts | — |
DHK E-300 (DMTDA) @ 95% Theory | — | 9.9Pts |
Formula Weight | 112.4Pts | 109.9Pts |
Physical properties of prepolymer cured with DHK E-300 (DMTDA) curative
The specific gravity of DHK E-300(DMTDA) is about 1.20g/cc at recommended use temperatures of 70-90°F(21-33°C), whereas the specific gravity of molten MOCA at its use temperature of 240°F(116°C) is 1.26. This means that weight delivery by volumetric pumps is comparable for the two materials and therefore if no alterations for meter-mixing machines, we must change the formula weight of MOCA into that of DHK E-300.
