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Product Details
DMTDA

DMTDA

  • Key features:
    - Appearance: amber liquid
    - Good replacement for MOCA
    - Non toxic to human being
    - No need to preheat
    - Eco-friendly
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Product Introduction

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
DMTDA
Physical Properties of MOCA-L300 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 (MOCA-L300), 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 (MOCA-L300) 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 -
MOCA-L300 @ 95% Theory - 9.9Pts
Formula Weight 112.4Pts 109.9Pts
The specific gravity of DMTDA (MOCA-L300) 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 (MOCA-L300).
Physical Properties of Prepolymer Cured With MOCA-L300 Curative
The physical properties of prepolymer, both ether and ester types, when cured with DMTDA (MOCA-L300) 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 (MOCA-L300) 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 (MOCA-L300) 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.
Taiwan PU Corporation is a professional DMTDA manufacturer, DMTDA producer. We supply high quality DMTDA products, have an experienced technical team and offer the best price to DMTDA.

DMTDA is called liquid MOCA, DMTDA for prepolymer, DMTDA curative, DMTDA curing agent, DMTDA for polyurethane elastomer, MOCA substitute, eco-friendly substitute of MOCA. If DMTDA is needed, please contact us.

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