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

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Liquefied MDI (diphenylmethane diisocyanate) plays an important role in the field of chemical production raw materials, and its upstream and downstream related products are extensive. This article will detail the upstream and downstream associated products of liquefied MDI.

Upstream Associated Products:

1. Aniline: Aniline is one of the key raw materials for the production of MDI. Aniline reacts with formaldehyde under acidic conditions to form diphenylmethanediamine (MDA), which then reacts with phosgene or dimethyl carbonate to form MDI.
2. Formaldehyde: Formaldehyde is also an important raw material for the production of MDI, which reacts with aniline to produce MDA.
3. Phosgene: Phosgene acts as a catalyst for MDI production and reacts with MDA to produce MDI.

downstream related products:

1. Polyurethane foam: MDI is an important raw material for the production of polyurethane foam. It is mixed with polyols, water, catalysts, etc. to make polyurethane foam materials, which are widely used in heat preservation, sound insulation, furniture and other fields.
2. Coating: MDI can be used as the raw material of the coating to improve the wear resistance, chemical resistance and hardness of the coating.
3. Elastomer: The reaction of MDI and polyether or polyester polyol can be made into polyurethane elastomer, which has excellent wear resistance, tear resistance and oil resistance, and is widely used in tires, hoses, seals and other fields.
4. Adhesive: MDI can be used as the raw material of adhesive and reacted with polyol to make polyurethane adhesive. It has the characteristics of high strength, water resistance and oil resistance, and is widely used in wood processing, footwear and other fields.

In short, the upstream and downstream associated products of liquefied MDI are extensive, involving many fields, and play an important role in the development of the chemical industry.

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