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[Chemical Knowledge]：What are the upstream raw materials for polyisocyanates? What do the downstream products contain?

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Polyisocyanate (Polyisocyanate, PI) is an important chemical raw material, widely used in polyurethane, elastomers, coatings, adhesives and other fields. There are many upstream and downstream related products of polyisocyanates, and the main upstream and downstream products are described in detail below.

Upstream Related Products:

1. Diphenylmethane diisocyanate (MDI):MDI is one of the important raw materials for the production of polyisocyanates, mainly used in the production of polyurethane foams, elastomers, coatings, etc.
2. Toluene diisocyanate (TDI):TDI is also one of the main raw materials for the production of polyisocyanate, which can be used to produce flexible polyurethane foams, coatings, adhesives, etc.
3. Polyols: Polyols are one of the main raw materials for polyurethane reaction with polyisocyanate. Common polyols include polyester polyols, polyether polyols, etc.

downstream related products:

1. Polyurethane foam: Polyurethane foam is one of the important downstream products of polyisocyanate. It has excellent thermal insulation, sound insulation, earthquake resistance and other properties, and is widely used in construction, home appliances, automobiles and other fields.
2. Polyurethane elastomer: Polyurethane elastomer has the advantages of high strength, high toughness, wear resistance, oil resistance, etc., and can be used in the production of tires, seals, transmission belts and other products.
3. polyurethane coating: polyurethane coating has excellent weather resistance, light retention, color retention and other properties, can be used for construction, automobile, furniture and other fields of coating.
4. Polyurethane adhesive: Polyurethane adhesive has the advantages of high strength, high weather resistance, water resistance, etc., and can be used for bonding in the fields of wood processing, construction, and automobiles.

In short, the upstream and downstream related products of polyisocyanate are very extensive, and the fields involved include construction, home appliances, automobiles, furniture, chemicals, etc. With the continuous development of science and technology, the application field of polyisocyanate will continue to expand.

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