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[Chemical Knowledge]：What are the upstream raw materials for pure MDI (diphenylmethane diisocyanate)? What are the downstream products?

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Pure MDI (diphenylmethane diisocyanate) is an important chemical raw material, which is widely used in polyurethane, elastomers, coatings, adhesives and other fields. The following are the upstream and downstream related products of pure MDI:

upstream products:

1. Aniline: Aniline is one of the important raw materials of pure MDI and is used in various steps of producing MDI.

2. Phosgene: Phosgene is used as a reaction medium in the production of pure MDI and reacts with aniline to produce MDI.

downstream products:

1. Polyurethane foam: Pure MDI is an important raw material for the production of polyurethane foam. It has excellent thermal insulation and mechanical properties and is widely used in construction, home appliances, automobiles and other fields.

2. Elastomer: Pure MDI can be used to produce polyurethane elastomer, which has good wear resistance, impact resistance and chemical resistance, and can be used to manufacture tires, seals, etc.

3. coatings: pure MDI can be used as raw materials for the production of polyurethane coatings, with excellent weather resistance, gloss and color retention.

4. Adhesive: Pure MDI can be used to produce polyurethane adhesive, which has the characteristics of high strength, water resistance and oil resistance, and is widely used in composite plates, shoe materials and other fields.

In short, as an important chemical raw material, pure MDI has a wide range of upstream and downstream related products, which is of great significance to promote the development of the chemical industry.

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