MOCA - L 300 (LIQUID)

STRUCTURAL FORMULA


PHYSICAL PROPERTIES OF MOCA-L300 CURATIVE
Equivalent Weight ......................... 107
Appearance ......................... Amber Liquid
Odor ......................... Slight Amin
Boiling Point ,oF(oC), ......................... 667(353)(decomposes)
Density(g/cc) @ 68oF(20oC) ......................... 1.21.
                        140oF(60oC) ......................... 1.18
                         212oF(100oC) ......................... 1.15
Viscosity , Cps @ 68oF(20oC) ......................... 690
                           140oF(60oC) ......................... 22
                           212oF(100oC) ......................... 55
Vapor Pressure , mm@65oF(20oC) ......................... 0.6
Amine Number, mg.KOH/g ......................... 536
TDA content % , by weight ......................... 1.0%
Moisture ......................... 0.1%

PROCESSING
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.
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 MOCA-L300 is about 1.2g/cc at recommended use temperatures of 70-90oF(21-33oC),whereas the specific gravity of molten MOCA at its use temperature of molten MOCA at its use temperature of 240oF(116oC) 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 MOCA-L300.

 
PHYSICAL PROPERTIES OF PREPOLYMER CURED WITH
MOCA-L300 CURATIVE
The physical properties of prepolymer, both ether and ester types, when cured with 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. 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, 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
200kg per iron drum