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[Chemical Knowledge]：What are the upstream raw materials of MDI and what are the downstream products?

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MDI, or diphenylmethane diisocyanate, is an important raw material in the production of chemicals and is widely used in the manufacture of polyurethane products. MDI has many upstream and downstream related products, and its main upstream and downstream products are described in detail below.

upstream products:

1. Aniline: Aniline is one of the main raw materials for MDI production. MDI is generated through phosgenation. The production of aniline mainly depends on the petrochemical industry, through catalytic hydrogenation, nitration, reduction and other process steps.
2. Formaldehyde: Formaldehyde is also an important raw material for MDI production. It reacts with aniline to produce diphenylmethane diamine, which then undergoes phosgenation to produce MDI. Formaldehyde is mainly produced by methanol oxidation.

downstream products:

1. Polyurethane foam: MDI, as an important raw material of polyurethane foam, is widely used in building insulation, home appliances, automobiles, furniture and other fields. Polyurethane foam has excellent thermal insulation, sound insulation, earthquake resistance and other properties, the market demand is large.
2. Polyurethane elastomer: MDI can be used to produce polyurethane elastomer, which has excellent properties such as high strength, high toughness, wear resistance and oil resistance, and is widely used in machinery, automobile, aerospace and other fields.
3. Polyurethane coatings: MDI as a coating raw material can improve the weather resistance, water resistance, chemical resistance and other properties of the coating, and is widely used in construction, automobiles, ships and other fields.
4. Polyurethane adhesive: MDI can be used to produce polyurethane adhesive, with high strength, high water resistance, weather resistance and other excellent properties, widely used in composite materials, building materials, automobiles and other fields.

In short, as an important raw material in the production of chemical products, MDI has many upstream and downstream related products, involving construction, home appliances, automobiles, furniture, machinery, aerospace and other fields. With the continuous progress of science and technology and the continuous expansion of the market, the application field of MDI and its upstream and downstream products will continue to expand.

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