Polyurethane (abbreviated PU) is the abbreviation of polyurethane, which is composed of polyisocyanate and polyhydroxyl polymer. It is a polymer compound containing many repeated carbamate segments (-NHCOO-) on the polymer main chain. Polyurethane is the only kind of polymer materials in plastic, rubber, foam, fiber, paint, adhesive and functional polymer fields have great application value of synthetic polymer materials, products penetrate into all aspects of the national economy, has become the current polymer materials in the most varieties, the most widely used, the fastest growing special organic synthetic materials. Its excellent performance and uses mainly include:
1, polyurethane foam material, divided into hard foam, semi-hard foam and soft foam three kinds: PU soft foam is a very ideal cushion material, cushion material is also the largest amount of soft foam application field; PU rigid foam is the most ideal insulation material for refrigeration equipment (such as refrigerators); The most typical application of PU semi-rigid foam is for the preparation of automobile bumpers.
2, synthetic leather slurry processing using water extraction DMF process, more environmentally friendly, and the production of synthetic leather has good moisture permeability, air permeability, feel soft, full, light, more rich in natural leather style and appearance, is the most ideal substitute for natural leather, widely used in clothing, footwear, luggage, furniture, sports and other industries.
3, polyurethane coating has strong adhesion, the film has excellent wear resistance, water resistance and drug resistance. Mainly used for furniture coatings, building materials coatings and industrial printing inks.
4, polyurethane elastomer has good tensile strength, tear strength, impact resistance, wear resistance, weather resistance, hydrolysis resistance, oil resistance and other advantages. Mainly used for coating materials (such as hoses, washers, wheel belts, rollers, gears, pipes, etc.), insulators, soles and solid tires.
5, polyurethane fiber (referred to as spandex) high resilience is unmatched by all elastic fibers, in traditional textiles, just add less than 5% of the amount of spandex, you can make the grade of traditional fabrics greatly improved, showing soft, comfortable, beautiful, elegant style.
6. The sole made of polyurethane sole liquid has low density, soft texture, comfortable wearing, good wear resistance, shock absorption and non-slip performance, and is mostly used in the manufacture of high-end leather shoes, sports shoes, travel shoes and so on.
7, the low temperature and ultra-low temperature performance of polyurethane adhesives exceeds all other types of adhesives, mainly used in packaging, construction, wood, automotive, shoe and other industries.
8, polyurethane sealant is used to fill the gap (holes, joints, joints, etc.) of the material, both bonding and sealing two functions. Polyurethane sealant, silicone sealant and polysulfide sealant constitute the three major varieties of high-grade sealant at present.
China is the world's largest polyurethane production and consumer, accounting for about 45% of the global polyurethane production. In recent years, with the consumption upgrading of building energy conservation, automobiles, household appliances, clothing, furniture and other industries, the application scale and field of polyurethane have been increasing.
