Chemistry Reference
In-Depth Information
consisting of equal weights of a triol with molecular weight 3200 and
a diol with molecular weight 1750. Use TDI as the diisocyanate
monomer to provide 3% free isocyanate, by weight,
in the final
prepolymer.
(c) MDI is the acronym for 4,4
0
-diisocyanato-diphenylmethane. Its struc-
ture is shown in Eq. (1-12). A prepolymer is made from an MDI (572
parts) and a polyol (512 parts). The equivalent weight of the MDI is
143 and that of the polyol is 512. Calculate the available NCO, in %,
in the prepolymer.
(d) How much MDI, at 98 isocyanate index, is required to react with 100
parts of a polyether polyol with hydroxyl number of 28 mg KOH/g, an
acid value of 0.01 mg KOH/g, and a water content of 0.01% (by
weight), blended with 4.0 parts of ethylene glycol and 2 parts of
m
-
phenylene diamine?
[30]
References
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