+ Liquid MOCA
+ Hardener for casting PU
+ Curing Agent for polyurethane
+ DMTDA AMBER LIQUID INSTEAD OF MOCA
+ Polyurethane Curing Agent
+ Liquid MOCA DMTDA
| Application | |||
|---|---|---|---|
| PU coatings, architectural coatings, sports materials, epoxy insulation material, waterproof wall and waterproof roofing materials. Printing rollers, rollers, trolley wheels and molds of PU elastomers. | |||
| Introduction | |||
|---|---|---|---|
| MOCA is used as PU (Polyurethane Resin) curing agent. The chlorine atoms on benzene ring can slow down the activity of "NH2" group, so as to extend the pot life while casting. | |||
| Structural Formula | |||
|---|---|---|---|
 | |||
| Physical Properties of DMTDA E300 Curative | ||||
|---|---|---|---|---|
| Equivalent Weight | 107 | |||
| Appearance | Amber Liquid | |||
| Odor | Slight Amin | |||
| Boiling Point,℉(℃) | 667(353)(decomposes) | |||
| Density(g/cm3) @68℉(20℃) | 1.21 | |||
| Density(g/cm3) @140℉(60℃) | 1.18 | |||
| Density(g/cm3) @212℉(100℃) | 1.15 | |||
| Viscosity, Cps @68℉(20℃) | 690 | |||
| Viscosity, Cps @140℉(60℃) | 22 | |||
| Viscosity, Cps @212℉(100℃) | 5 | |||
| Vapor Pressure, mm @65℉(20℃) | 0.6 | |||
| Amine Number, mg.KOH/g | 536 | |||
| TDA content %, by weight | ≤1.0% | |||
| Moisture | ≤0.1% | |||
| Processing | |||
|---|---|---|---|
| DMTDA E300, being a liquid at room temperature result 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 during mixing or in meter mixing machines. Additionally, its liquid state permits processing prepolymer at lower temperatures than that of MOCA. DMTDA E300 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 | - | ||
| DMTDA E300 @ 95% Theory | - | 9.9Pts | ||
| Formula Weight | 112.4Pts | 109.9Pts | ||
| The specific gravity of DMTDA E300 is about 1.2g/cm3 at recommended use temperatures of 70-90℉(21-33℃) ,whereas the specific gravity of molten MOCA at its use temperature of molten MOCA at its use temperature of 240℉(116℃) is 1.26. This means that weight delivery by volumetric pimps 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 DMTDA E300. | ||||
| Physical Properties of Prepolymer Cured With DMTDA E300 Curative | |||
|---|---|---|---|
The physical properties of prepolymer, both ether and ester types, when cured with DMTDA E300 curative, are comparable to those obtained with MOCA. As in MOCA-curing system, physical properties are sensitive to the ration (stoichiomety) of curative to prepolymer. DMTDA E300 curative exhibition tolerance to stoichiomety variations similar to that of MOCA. Low stoichiomety (80~90%) generally tends to maximize properties such as compression set resistance, while high stoichiomety (100-105%) tends to maximize properties such as tear strength and flex life. The best results for most application are obtained at about 95% stoichiometry. While cure conditions (temperature and times) are similar to those used with MOCA, DMTDA E300 curative requires somewhat closer attention to post cure conditions to obtain maximum physical properties, particularly with respect to compression set and dynamic properties. Use the recommended schedules listed. | |||
| Package | |||
|---|---|---|---|
| 20kg per iron drum or 200kg per iron drum Notice: These values are based on the test of our present laboratory test specimens. | |||
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