Characteristics of polyurethane coatings

Polyurethane coating is a common type of coating at present, which can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane topcoat paint is generally composed of isocyanate prepolymers (also known as low molecular carbamate ester polymers) and hydroxyl resins, commonly known as curing agent components and main agent components. There are many varieties of this kind of coating, and the scope of application is wide. According to the different components containing hydroxyl groups, it can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and other varieties. Generally speaking, it has good mechanical properties, high solid content, and good performance in all aspects. It is a coating with great development prospects. The main application directions are wood coatings, automobile maintenance coatings, anti-corrosion coatings, floor coatings, electronic coatings, special coatings, etc.

The disadvantage is that the construction process is complicated, the requirements for the construction environment are high, and the paint film is prone to defects. One-component polyurethane coatings mainly include polyurethane oil coatings, moisture-curing polyurethane coatings, and closed polyurethane coatings. Its application range is not as wide as two-component coatings, and it is mainly used for floor coatings, anti-corrosion coatings, pre-rolled material coatings, etc. Its overall performance is not as good as that of two-component coatings.