Polyurethane anti-corrosion paint
Polyurethane anti-corrosion paint
Polyurethane refers to a high polymer whose molecular structure contains carbamate bonds. Carbamate bonds are formed by the reaction of isocyanate groups and hydroxyl groups:
—NCO+—OH→—NHCOO—
Therefore, the monomers of polyurethane resin are polyisocyanates and polyhydroxy compounds. Polycyanates are classified into two types: aromatic and aliphatic. Because the former is relatively inexpensive and has a higher reactivity at room temperature, it is rarely used in anti-corrosion paints and is only applied in topcoats for outdoor coatings with decorative requirements. To improve storage, application and film performance, polyacrylate monomers are often made into polyurethane polymers or adducts containing free cyanate groups.
The advantages of polyurethane anti-corrosion paint lie in its good adaptability and comprehensive performance. Compared with other resins, it is easier to obtain a wide range of physical and mechanical properties through molecular structure design. Moreover, it can simultaneously maintain a balance between chemical resistance and adhesion, wear resistance and anti-permeability, hardness and elasticity, and other mutually contradictory properties, thus being able to adapt to complex and changeable working conditions. This is because the carbamate bond is both highly polar and chemically inert, and the isocyanate group is highly reactive, which provides sufficient means for adjustment as needed. Polyurethane anti-corrosion paint has gained attention this year due to its long-term effects in many aspects and has become an important type of highly efficient anti-corrosion paint along with epoxy resin and chlorinated rubber.
Classification of polyurethane anti-corrosion paint
Polyurethane anti-corrosion paint is generally classified into five types according to the curing mechanism:
Oxygen-cured polyurethane modified oil (single-component).
2. The adducts or prepolymers of polyisocyanates cured by polyhydroxy compounds (two-component).
3. Adducts or prepolymers of polyisocyanates cured and blocked by polyhydroxy compounds (single-component).
4. Wet-cured polyisocyanate prepolymer (one-component).
5. Catalytic wet curing polyisocyanate prepolymer (two-component).
Polyurethane refers to a high polymer whose molecular structure contains carbamate bonds. Carbamate bonds are formed by the reaction of isocyanate groups and hydroxyl groups:
—NCO+—OH→—NHCOO—
Therefore, the monomers of polyurethane resin are polyisocyanates and polyhydroxy compounds. Polycyanates are classified into two types: aromatic and aliphatic. Because the former is relatively inexpensive and has a higher reactivity at room temperature, it is rarely used in anti-corrosion paints and is only applied in topcoats for outdoor coatings with decorative requirements. To improve storage, application and film performance, polyacrylate monomers are often made into polyurethane polymers or adducts containing free cyanate groups.
The advantages of polyurethane anti-corrosion paint lie in its good adaptability and comprehensive performance. Compared with other resins, it is easier to obtain a wide range of physical and mechanical properties through molecular structure design. Moreover, it can simultaneously maintain a balance between chemical resistance and adhesion, wear resistance and anti-permeability, hardness and elasticity, and other mutually contradictory properties, thus being able to adapt to complex and changeable working conditions. This is because the carbamate bond is both highly polar and chemically inert, and the isocyanate group is highly reactive, which provides sufficient means for adjustment as needed. Polyurethane anti-corrosion paint has gained attention this year due to its long-term effects in many aspects and has become an important type of highly efficient anti-corrosion paint along with epoxy resin and chlorinated rubber.
Classification of polyurethane anti-corrosion paint
Polyurethane anti-corrosion paint is generally classified into five types according to the curing mechanism:
Oxygen-cured polyurethane modified oil (single-component).
2. The adducts or prepolymers of polyisocyanates cured by polyhydroxy compounds (two-component).
3. Adducts or prepolymers of polyisocyanates cured and blocked by polyhydroxy compounds (single-component).
4. Wet-cured polyisocyanate prepolymer (one-component).
5. Catalytic wet curing polyisocyanate prepolymer (two-component).