What is TDI?
Toluene Diisocyanate (TDI) is an important organic compound with the chemical formula C9H6N2O2. It typically exists in two isomeric forms: 2,4-TDI and 2,6-TDI, with 2,4-TDI being the most commonly used. TDI is a colorless to pale yellow liquid with a strong, irritating odor. Below are some specific details about TDI:
Physical and Chemical Properties
Physical State: Liquid at room temperature.
Volatility: Although TDI is not as volatile as some low-molecular-weight organic solvents, it can still vaporize at high temperatures.
Solubility: Insoluble in water but soluble in most organic solvents.
Reactivity: Reacts rapidly with water, alcohols, and amines to form urea compounds.
Preparation Method
TDI is usually produced by first nitrating toluene with nitric acid and sulfuric acid to form toluene diamine (TDA), which is then reacted with phosgene to produce TDI.
Application Areas
Polyurethane Foams: TDI is a primary raw material for producing both flexible and rigid polyurethane foams, which are widely used in furniture, mattresses, automotive interiors, and building insulation materials.
Coatings and Adhesives: TDI-based polyurethane resins have excellent chemical and mechanical properties and are commonly used in high-performance coatings and adhesives.
Elastomers: TDI is also used to produce polyurethane elastomers, which have good wear resistance and elasticity and are suitable for manufacturing shoe soles, wheels, and other applications.
Safety and Health Impact
Toxicity: TDI is toxic, and long-term or high-concentration exposure can cause skin and eye irritation, respiratory inflammation, and even asthma.
Protective Measures: Appropriate protective measures should be taken during production and use, such as wearing protective goggles, respirators, and protective clothing, and ensuring good ventilation in the workplace.
Environmental Protection: TDI and its derivatives can have potential environmental impacts, and waste materials should be handled properly to prevent contamination of water sources and soil.
Regulations and Standards
Many countries and regions have strict regulations for the use and management of TDI, such as the EU's REACH regulations and the OSHA standards in the United States, to ensure its safe use and handling.
Our Offer
We are pleased to inform you that we also offer high-quality TDI to meet the needs of our customers. If you are interested in obtaining more information or placing an order, please do not hesitate to contact us.