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How to produce polyurethane?

How to produce polyurethane?
Update Time:2017-02-18
Polyurethanes, like all plastics, are polymers made by reacting diisocyanates (MDI and/or TDI) with a range of polyols. Depending on the desired end product, chemical formulations may contain other ingredients such as catalysts, blowing agents and possibly flame retardants. These various combinations allow the manufacture of a range of product types including:

 

rigid and flexible foams
rigid and flexible integral skin foams
elastomers
adhesives
coatings
sealants
The density of the product is determined by the amount of blowing agent used, and the flexibility or rigidity by the type of polyols and diisocyanates involved.

Different forms of polyurethane are often combined with other materials to manufacture a variety of end products, for example:

insulated building panels
mattresses and upholstered furniture
car seats
domestic refrigerators and freezers
composite wood panels
truck bodies
footwear
sportswear