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[Chemical Knowledge]：Properties and Uses of Toluene Diisocyanate

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Toluene diisocyanate (TDI) is an important organic chemical raw material, which is widely used in polyurethane, coatings, elastomers, adhesives and other fields. This article will detail the properties and uses of toluene diisocyanate.

1. the nature of toluene diisocyanate

Tolylene diisocyanate is a colorless or slightly yellow transparent liquid with a strong pungent odor. Its chemical properties are active and can react with a variety of compounds, such as alcohols, amines, water and so on. TDI has high toxicity and can cause respiratory irritation and allergic reactions, so its exposure concentration needs to be strictly controlled during the production process.

2. the use of toluene diisocyanate

1. polyurethane foam

toluene diisocyanate is one of the important raw materials of polyurethane foam. It is mixed with polyols, water and other raw materials, polymerization reaction, the formation of polyurethane foam. This kind of foam plastic has excellent heat insulation, sound insulation, earthquake resistance and other properties, and is widely used in construction, home appliances, automobiles and other fields.

2. coating

Toluene diisocyanate can be used as a curing agent in the coating, and hydroxyl-containing resin reaction, the formation of cross-linked structure, improve the weather resistance of the coating, chemical resistance and other properties. TDI coatings are widely used in automobiles, ships, construction and other fields.

3. Elastomer

Toluene diisocyanate can be used for the preparation of polyurethane elastomers, with high strength, wear resistance, oil resistance and other properties, can be used to make tires, seals, shock absorbers and so on.

4. adhesive

toluene diisocyanate can be used as a curing agent in the adhesive, and hydroxyl-containing polymer reaction, generated with high strength, water resistance, heat resistance and other properties of the adhesive. TDI adhesives are widely used in wood processing, shoemaking, packaging and other fields.

In short, as an important organic chemical raw material, toluene diisocyanate has a wide range of applications in the field of chemical production raw materials. However, due to its high toxicity, it is necessary to strictly control its exposure concentration during production and use to ensure production safety and personnel health.

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