2,4-TDI is prepared in three steps from toluene via dinitrotoluene and 2,4-diaminotoluene (TDA). Finally, the TDA is subjected to phosgenation, i.e., treatment with phosgene to form TDI. This final step produces HCl as a byproduct and is a major source of industrial hydrochloric acid.
item | value |
CAS No. | 584-84-9 |
Other Names | Toluene-2,4-diisocyanate,2,4-tolylene diisocyanate |
MF | C9H6N2O2 |
EINECS No. | 209-544-5 |
Place of Origin | China |
Type | Synthetic Fibers, Synthetic Resin And Plastics, Synthetic Rubbers |
Brand Name | YIJIA |
Model Number | YJ-012 |
Purity | 99.9% |
UN No. | 2078 |
HS code | 292910 |
Packing Group | 2 |
Hazard Codes | T+ |
Melting point | 20-22 °C |
Boiling point | 124-126 °C |
Flash Point | 121°C |
Grade Standard | Industrial Grade, Medicine Grade, Reagent Grade |
Application | Synthetic Fibers |
Appearance | colorless or light yellow liquid |
The isocyanate functional groups in TDI react with hydroxyl groups to form carbamate (urethane) links. The two isocyanate groups in TDI react at different rates: The 4-position is approximately four times more reactive than the 2-position. 2,6-TDI is a symmetrical molecule and thus has two isocyanate groups of similar reactivity, similar to the 2-position on 2,4-TDI. However, since both isocyanate groups are attached to the same aromatic ring, reaction of one isocyanate group will cause a change in the reactivity of the second isocyanate group.[3] It is also sometimes used in Rocket propellants.[5]
It is used in the production of flexible polyurethane foams.
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