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Polyurethane coating agent is the main type of development today. Its advantages are: soft and elastic coating; good coating strength, can be used for very thin coating; porous coating, moisture permeability and aeration; wear resistance, Moisture resistant and dry cleaning resistant. The disadvantages are: high cost; poor weather resistance; hydrolysis in water, heat and alkali.
The TPU coating agent is classified into a polyester type polyurethane, a polyether type polyurethane, an aromatic isocyanate type polyurethane, and an aliphatic isocyanate type polyurethane. According to the medium used in the use, it is divided into solvent and water.
The polymers containing repeating structural units of the -NHCOO- group on the macromolecular backbone are collectively referred to as polyurethanes, abbreviated as polyurethane (PU). It is prepared by reacting an organic polyisocyanate with a polyether or polyester polyol. Polyurethane plastics commonly found in the form of soft and hard foams.
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