What are the properties of toluene diisocyanate

Toluene diisocyanate is a colorless, transparent to light yellow liquid with pungent smell; The color darkens when exposed to light. The relative density is 1.22 ± 0.01 (25 ℃). Freezing point 3.5 ~ 5.5 ℃ (tdi-65); 11.5～13.5℃(TDI-80); 19.5～21.5℃。 Boiling point 251 ℃. Flash point 132 ℃ (closed cup). Vapor density 6.0. Vapor pressure: 0.13kpa (0.01mmhg20 ℃). The flammability limit of steam and air mixture is 0.9 ~ 9.5%. Insoluble in water; Soluble in acetone, ethyl acetate and toluene. It is easy to react with compounds containing active hydrogen atoms: amines, water, alcohols, acids and bases, especially with sodium hydroxide and tertiary amines, which are difficult to control, and release a lot of heat. Reaction with water to form carbon dioxide is one of the key reactions in the manufacture of polyurethane foam. Damp should be avoided. The polymerization rate is very slow at room temperature, but it can self polymerize to form dimer when heated to more than 45 ℃ or in the presence of catalyst. It can react with strong oxidants. It will catch fire in case of heat, open fire and spark. Heat and decompose to release cyanide and nitrogen oxides.

Refractive index 5654 ~ 1.5666, vapor pressure 2.8pa (20 ℃) J and boiling point 3.3pa (25 ℃), 106-107 ℃ (0.67kpa), 120 ℃ (1.3kpa) and 1311c. (2.lkPa)。