Amine Catalyst
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A-1 contains 70% bis(2-dimethylamino ethyl) ether,
one of the most active urethane foam |
amine catalysts known. As a matter of convenience, the
pure amine ether has been diluted with 30 weight percent
dipropylene glycol to facilitate metering and to permit
the use of conventional quantities in foam formulations.
Properties |
Specification |
Specific Gravity (20/20ˇÉ)
Viscosity (20ˇÉ, cP)
Freezing Point
Vapor Pressure, mm Hg |
0.9022
4.1
Sets to glass below -80(-112˘µ)
0.01 |
Solubility in Water(20ˇÉ)
Solubility in Benzene
Refractive Index, nD(25ˇÉ) |
Complete
Complete
1.4346 |
Flash Point ˇÉ[˘µ]
Pensky-Martens Closed Cup
Cleveland Open Cup |
74[165]
77[170] |
˘şCatalytic Activity |
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The basic chemical reactions important
in the polyether foaming process are
the |
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poly/isocyanate reaction and the water/isocyanate
reaction. In the polyol/isocyanate (alcohol/isocyanate)reaction,
catalyst A-1 give a specific rate constant
thhat is about 10 percent higher than a similar
blend of triethylenediamine, the next most
active amine. In the water/isocyanate reaction,
however, A-1 has a specific rate constant
that is 50% greater than triethylenediamine,
the next most active amine. |
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The strong catalytic effect of A-1
toward the water/isocyanate reaction
facilitates the |
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balancing of the catalysis of the polyol/isocyanate
reaction by small variations in the stannous
octoate level. This control is important in
the production of commercial open-celled,
split-free, flexible-urethane foam. The level
of A-1 can be adjusted over a wide range to
permit control of foam rise time without a
sacrifice in tin operating range. |
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