Toluene diisocyanate has six isomers, namely toluene-2,3-diisocyanate, toluene-2,4-diisocyanate, toluene-2,5-diisocyanate, toluene-2,6-diisocyanate, Toluene-3,4-diisocyanate, toluene-3,5-diisocyanate. Among them, toluene-2,4-diisocyanate and toluene-2,6-diisocyanate two isomers are the most common. Industrial toluene diisocyanate is usually a mixture of toluene-2,4-diisocyanate and toluene-2,6-diisocyanate.

Stability and reactivity: Stable.

Dangerous characteristics: Toluene diisocyanate is combustible in case of open flame and high heat. It can react with oxidants. Reacts violently with amines, alcohols, alkalis and warm water, and can cause combustion or explosion. It can decompose to produce toxic gas when heated or burned. Its vapor is heavier than air and can spread to a relatively far place at a lower level, and will ignite when it encounters a fire source. In case of high heat, the internal pressure of the container will increase and there is a danger of cracking and explosion.

Packing method: 500ML corrugated glass bottle, iron cap crimped glass bottle, plastic bottle or metal barrel (can) outside the ordinary wooden box.

Main uses: Used in organic synthesis, production of foam plastics, coatings and chemical reagents.

Production method: Dinitrotoluene is generated by nitration of toluene, and then toluene diamine is obtained by reduction. Toluene diamine reacts with phosgene to obtain TDI (mainly 2,4-isomer).

Properties: Colorless liquid. There is a pungent smell. The color becomes darker in daylight. Sodium hydroxide or tertiary amine can cause polymerization. Reacts with water to produce carbon dioxide. It is miscible with ethanol (decomposition), ether, acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene, olive oil and diethylene glycol methyl ether. poisonous. May cause cancer. It is irritating.