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[Chemical Knowledge]：Properties and Uses of Polymeric MDI

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Polymeric MDI (diphenylmethane diisocyanate) is an important chemical raw material, which is widely used in polyurethane, rubber, coatings and other fields. This paper will detail the properties and uses of polymeric MDI.

1. the properties of polymeric MDI

1. Physical properties

polymeric MDI is a colorless or yellowish transparent liquid with high viscosity. It is not easily soluble in water, but can be dissolved in some organic solvents, such as acetone, carbon tetrachloride and so on.

2. chemical properties of

polymerization MDI containing isocyanate groups, with high reactivity, can be with active hydrogen containing compounds addition reaction, generating the corresponding urea, amine, ester and other compounds. In addition, polymeric MDI can also undergo a self-polymerization reaction to produce a polyurethane polymer compound.

2. the use of polymeric MDI

1. Polyurethane foam material

polyurethane foam material is a widely used building insulation material, with excellent heat insulation performance and mechanical properties. Polymeric MDI, as one of the important raw materials of polyurethane foam, reacts with polyols, water and other raw materials to produce polyurethane foam.

2. elastomer

polymerization MDI can be used to prepare polyurethane elastomer, with high elasticity, wear resistance, oil resistance and chemical resistance, widely used in shoe-making, mechanical seal, shock absorption and other fields.

3. coating

polymerization MDI can be used as the main film-forming material, and pigments, solvents and other ingredients mixed, made of polyurethane coatings, with excellent weather resistance, light retention, color retention and mechanical properties.

4. adhesive

polymerization MDI can be used as the main component of the adhesive, mixed with polyols and other raw materials, made of polyurethane adhesive, with high bonding strength and water resistance, widely used in wood processing, construction, automotive and other fields.

In conclusion, polymeric MDI, as an important chemical raw material, has broad application prospects in the field of chemical production raw materials.

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