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[Chemical Knowledge]：The difference between polyurethane TDI and MDI: the same polyurethane raw materials, but each has its own advantages

Read： 1849 Time：15months ago Source：Transform the World with Simplicity

Polyurethane (TDI) and polyurethane (MDI) are two common polyurethane raw materials in the market, and they are widely used in industrial production and daily life. Although both belong to polyurethane compounds, there are some obvious differences in chemical composition, properties and uses.

Polyurethanes TDI and MDI have different structures in terms of chemical composition. The full name of TDI is toluene diisocyanate, which contains phthaloyl and isocyanato groups in its molecule, while MDI refers to diphenyl diisocyanate, which contains diphenyl diformyl and isocyanato groups in its molecule. These two isocyanates have certain differences in structure, which is also the basis of their differences in properties.

In terms of properties, polyurethane TDI and MDI also have different characteristics. TDI is liquid and volatile at room temperature, so special precautions are required during use. MDI, on the other hand, is a solid and relatively stable. In addition, there are some differences in the curing speed and mechanical properties of TDI and MDI. For example, in the hardness, flexibility and wear resistance of polyurethane products, TDI and MDI have different performances in the ratio and curing conditions, and need to be selected according to the specific situation.

In terms of use, TDI and MDI also have their own fields of application. TDI has good performance in the preparation of polyurethane foam and elastomers, and is suitable for the production of mattresses, car seats, furniture and other products. MDI is better in the preparation of adhesives, coatings and elastomers, and has a wider range of applications, which can be used in construction, automotive, aviation and other industries.

In summary, although polyurethane TDI and MDI are the same as polyurethane raw materials, there are obvious differences in structure, properties and uses. In practical applications, it is necessary to select suitable raw materials according to specific needs and conditions, and operate in strict accordance with the requirements of the production process to ensure product quality and production safety.

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