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Send EmailToluene di isocyanate, Tolylene diisocyanate, TDI, 26471-62-5
Toluenediisocyanate
CAS: 26471-62-5
Molecular Formula: C9H6N2O2
Names and Identifiers
Physico-chemical Properties
| Molecular Formula | C9H6N2O2 |
| Molar Mass | 174.15614 |
| Density | 1.22 |
| Melting Point | 19.5~21.5℃ |
| Boling Point | 247℃ |
| Flash Point | 137 °C |
| Water Solubility | 124mg/L at 25℃ |
| Solubility | miscible with Ether,Acetone,Benzene |
| Vapor Presure | 0.021mmHg at 25°C |
| Appearance | clear liquid |
| Color | Colorless to Light yellow |
| Storage Condition | Store below +30°C. |
| Refractive Index | 1.5660 to 1.5700 |
| Physical and Chemical Properties | Colorless transparent or light yellow flammable liquid. There is a strong irritating odor. melting point 19.5~21.5 ℃ boiling point 247 ℃ relative density 1.217 flash point 127 ℃ solubility and ethanol (decomposition), diethylene glycol, diethyl ether, acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene, olive oil miscible. |
| Use | Used in the manufacture of polyurethane foam and rubber, insulating paint and adhesives |
Risk and Safety
| Risk Codes | R26 - Very Toxic by inhalation R36/37/38 - Irritating to eyes, respiratory system and skin. R40 - Limited evidence of a carcinogenic effect R42/43 - May cause sensitization by inhalation and skin contact. R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S23 - Do not breathe vapour. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S24/25 - Avoid contact with skin and eyes. |
| UN IDs | 2078 |
| RTECS | NQ9490000 |
| HS Code | 29291090 |
| Hazard Class | 6.1(a) |
| Packing Group | II |
| Toxicity | A designated hazardous waste (EPA). It is a colorless to yellow solid, melting at about 20°C. TDI and MDI (diphenylmethane diisocyanate) are used in the manufacture of polyurethane foams by reaction with polyhydroxy compounds. These foams are used for insulation, upholstering, etc. Exposure is commonly by inhalation of the vapor. Both TDI and MDI can cause irritation of eyes and mucous membranes, in severe cases leading to pulmonary edema. Sensitization to TDI is common and frequently rapid, leading to an allergic reaction and some loss of lung function. In the United Kingdom, the threshold limit value is 0.02 ppm for not more than 20 min, or 0.005 ppm for 8 h. |
Upstream Downstream Industry
| Raw Materials | n-Butyl acetate o-Xylene o-Xylene Toluene Toluene Coke(coal) Sulfuric acid Sulfuric acid Chlorine 2-Ethyl-2-(hydroxymethyl)-1,3-propanediol Nitric acid Nitric acid |
| Downstream Products | Polyurethane |
Nature
This product is a colorless or light yellow transparent liquid with pungent odor, which will turn yellow slowly under ultraviolet light irradiation. It can react with hydroxyl, water, Amine and other compounds containing active hydrogen, and can also be self-polymerized under certain conditions to generate carbamate, urea, biuret, isocyanurate, etc, is an important raw material of polyurethane.
Preparation Method
toluene diisocyanate was obtained by reaction with phosgene (COCl2) using toluene nitration and hydrogenation product as raw material. The synthesis of toluene diisocyanate (TDI) by photo-gasification is widely used in industry. The process has a batch and continuous process. Large Units are mainly produced by a continuous process.
Use
used as a variety of polyurethane materials such as flexible foam, coatings, Cast Elastomers, pavement materials, waterproof coatings and adhesives and other raw materials. TDI can be used as modified TDI, Dimer, trimer, adduct prepolymer, and the like.
Safety
TDI has strong toxicity and reactivity. The volatiles on the skin, eyes and mucous membranes have a strong stimulating effect, make people tears, Laryngalgia, Cough, long-term contact can cause bronchitis, a few cases of asthma, bronchiectasis and even pulmonary heart disease. When the concentration of TDI in the air is more than 0. 05mg/L, the human body will have severe Cough and shortness of breath. The maximum allowable concentration in air is 0.02 mg/m3. TDI is susceptible to reaction with water and tissues in the skin and body. Therefore, the ventilation device should be installed in the operation site. The operator should wear protective equipment and prohibit the product from contacting the skin during use. Galvanized iron drum packaging, net weight 250kg per barrel. Hazardous materials shall be stored and transported according to regulations. Sealed steel barrels shall be used for shipment, and barrel damage shall be prevented during loading, unloading and transportation. If the packaging barrel is damaged, or the seal is damaged, the barrel product should be used as soon as possible, otherwise it should be sealed with nitrogen and oxygen. Products should be stored in a cool, ventilated and dry place, and keep the container closed, storage temperature of 15~40. To prevent rain, sun exposure. At the same time, the product is combustible, in the transport, storage and use of the process should pay attention to fire. If the product solidifies below the specified storage temperature, it must be melted before use (direct baking with open flame is prohibited) and the product in the barrel is fully mixed and uniform.
Reference Information
| LogP | 3.43 at 22℃ |
| (IARC) carcinogen classification | 2B (Vol. 39, Sup 7, 71) 1999 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Use | Used as a raw material for the manufacture of polyurethane soft foam, coatings, rubber and adhesives Used for the manufacture of polyurethane foam and rubber, insulating paint and adhesives, etc. |
| production method | 1. It is prepared by the action of 2, 4-diaminotoluene and phosgene. First, dissolve the solid diaminotoluene in chlorinated benzene, raise the temperature to 70 ℃ under stirring to obtain diaminotoluene chlorobenzene solution, put the oxidized benzene recovered by light gasification into a low-temperature phosgene pot, add a certain amount of liquid phosgene, add the prepared diaminotoluene solution dropwise under stirring, perform phosgenization at 40 ℃, then put the low-temperature phosgenization material into a high-temperature pot for high-temperature phosgenization, and ventilate while heating for about 4 hours, the reaction is generally carried out at 120~125 ℃. After the reaction is completed, it is obtained by using nitrogen gas, distillation and rectification. |
| category | toxic substances |
| toxicity classification | poisoning |
| acute toxicity | oral-rat LD50: 4130 mg/kg; Oral-mouse LD50: 1950 mg/kg |
| stimulation data | skin-rabbit 500 mg severe |
| explosive hazard characteristics | blastable when mixed with air |
| flammability hazard characteristics | open flame is combustible; heating emits toxic nitrogen oxide gas |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; separate from food raw materials storage and transportation |
| fire extinguishing agent | water, carbon dioxide, sand, foam |
| occupational standard | TWA 0.02 mg/m3; STEL 0.07 mg/m3 |
