Characteristics and Application of Polyurethane Resin

Polyurethane resin, whose full name is polyurethane, is a polymer compound that has emerged in the industry for its diversity and excellent properties. This article will take an in-depth look at the properties of polyurethane resins and their wide range of applications, including coatings, elastomers, foams, adhesives and fibers. In addition, we will also pay attention to the rise of water-based polyurethane and explore its prospects in the field of environmentally friendly coatings.

Characteristics of polyurethane resin:

The synthesis of polyurethane resins involves the reaction of diisocyanates with compounds bearing two or more hydroxyl groups. These include commonly used monomers such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), etc., as well as polyols such as ethylene glycol, polyester oligomers and polyether oligomers. Polymer. The reaction mechanism involves the reaction of isocyanate groups with hydroxyl groups to form urethane units. The main characteristics of polyurethane resin come from the urethane group (-NHC0O-) on its main chain. Its macromolecular structure can also contain different groups such as ether, ester, urea, biuret, and allophanate. group. Polyurethane can be divided into two types: polyester type and polyether type, according to the different hydroxyl components.

• High temperature resistance, able to remain stable under extreme temperature conditions;

• Electrical insulation, a good choice as an insulating material in the electronic and electrical fields;

• Resistant to chemical corrosion and has high resistance to a variety of chemicals;

• Flexibility, suitable for applications requiring flexibility, such as coatings and adhesives;

• Adhesion, has excellent adhesion and can be widely used in adhesives and coatings.

Applications of polyurethane resin:

• Coatings and coatings, polyurethane resins are widely used in various types of coatings, including two-component and one-component polyurethane coatings. It shows excellent mechanical properties, high solid content, toughness, adhesion, water resistance, abrasion resistance and corrosion resistance in the fields of wood coatings, automotive refinishing paints, anti-corrosion coatings, floor coatings and other fields.

• Elastomers made from polyurethane resins, such as polyurethane rubber, are widely used in the manufacture of seals, vibration dampers, vehicle suspension systems, and more.

• Foam material, polyurethane foam exists in the form of hard and soft foam and is used in seats, gaskets, insulation materials, packaging materials and other fields.

• Adhesive, polyurethane resin adhesive can bond various materials such as metal, glass, plastic and wood due to its excellent bonding properties.

• Fiber, polyurethane fiber is widely used in the manufacture of synthetic leather, elastic fibers, ropes and fabrics, showing good wear resistance and flexibility.

Conclusion

In recent years, the development of water-based polyurethane has become the focus of the industry. By using water as the dispersion medium, water-based polyurethane avoids the use of organic solvents and has the advantages of no pollution, safety and reliability, good mechanical properties, good compatibility, and easy modification. Its synthesis process includes two stages: pre-stepwise polymerization and dispersion, which makes it have broad application prospects in the field of environmentally friendly coatings. As a multifunctional polymer compound, polyurethane resin shows unlimited possibilities. In the fields of coatings, elastomers, foam materials, adhesives and fibers, its excellent properties provide a wide range of options for industrial applications. With the rise of water-based polyurethane, the field of environmentally friendly coatings will usher in more innovations, and polyurethane resin will continue to lead the development trend of polymer materials in the future.