Products Description of Tolylene-2,4-diisocyanate CAS#584-84-9
Tolylene-2,4-diisocyanate, usually referred to as 2,4-TDI, is a colourless, clear liquid at ambient temperature and atmospheric pressure. This chemical is moisture-sensitive and reacts readily with water. While it maintains reasonable stability under suitable conditions, hydrolysis will occur upon contact with moisture.
For the preservation of product quality and stability, 2,4-TDI shall be kept in a cool, dry and adequately ventilated storage area, shielded from direct sunlight and humidity sources.
Tolylene-2,4-diisocyanate Chemical Properties
| Melting point | 20-22 °C(lit.) |
| Boiling point | 124-126 °C18 mm Hg(lit.) |
| density | 1.225 g/mL at 25 °C |
| vapor density | 6 (vs air) |
| vapor pressure | 0.03 mm Hg ( 25 °C) |
| refractive index | n20/D 1.568(lit.) |
| Fp | 250 °F |
| storage temp. | 2-8°C |
| solubility | Miscible with ether, acetone, benzene, carbontetrachloride and chlorobenzene. |
| form | Liquid |
| Specific Gravity | 1.225 |
| color | Colorless |
| Odor | Sharp, pungent odor detectable at 0.02 to 0.4 ppm |
| explosive limit | 0.095 |
| Water Solubility | reacts |
| Sensitive | Moisture Sensitive |
| Merck | 149530 |
| BRN | 744602 |
| Exposure limits | TLV-TWA 0.0355 mg/m3 (0.005 ppm) (ACGIH and NIOSH); STEL or ceiling/10 min 0.142 mg/m3 (0.02 ppm) (ACGIH, NIOSH, and OSHA); IDLH 71 mg/m3 (10 ppm) (NIOSH). |
| Stability: | Stable, but decomposes in the presence of moisture. Also heat and light sensitive. Readily polymerizes in contact with base. Reacts with compounds containing active hydrogen. Incompatible with strong oxidizing agents. Corrodes some copper and aluminium alloys. |
| InChIKey | DVKJHBMWWAPEIU-UHFFFAOYSA-N |
| LogP | 3.43 at 22℃ |
| CAS DataBase Reference | 584-84-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Benzene, 2,4-diisocyanato-1-methyl-(584-84-9) |
| EPA Substance Registry System | Toluene-2,4-diisocyanate (584-84-9) |
| Hazard Codes | T+ |
| Risk Statements | 26-36/37/38-40-42/43-52/53 |
| Safety Statements | 23-36/37-45-61 |
| RIDADR | UN 2078 6.1/PG 2 |
| WGK Germany | 2 |
| RTECS | CZ6300000 |
| F | 46316 |
| Autoignition Temperature | >619 °C |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | II |
| HS Code | 29291010 |
| Hazardous Substances Data | 584-84-9(Hazardous Substances Data) |
| Toxicity | Acute oral LD50 for rats 5,800 mg/kg, wild birds 100 mg/kg (quoted, RTECS, 1985). |
| IDLA | 2.5 ppm |
Product Application of Tolylene-2,4-diisocyanate CAS#584-84-9
2,4-TDI is a core monomer for polyurethane synthesis. It is mainly applied to produce flexible polyurethane foams, which are widely used in furniture cushions, mattresses, automotive seating and carpet underlay. It also serves as a key raw material for polyurethane elastomers, coatings, adhesives and sealants.
The finished elastomers feature excellent wear resistance and mechanical strength, suitable for rollers, gaskets and shoe soles. It can be used to prepare moisture-curable coatings and prepolymers for wood, concrete and metal protection. In addition, it works as a cross-linking agent in polymer modification and is widely used in polyurethane-related formulation industries under strictly controlled operating conditions.
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