Polyurethane(PU) refers to the urethane group contained in the molecular structure Polymer of group (—NH—COO—). Carbamates are generally obtained by the reaction of isocyanates and alcohols. In addition, polyurea obtained by the reaction of polyisocyanate and polyamine is also classified as polyurethane in a broad sense Adhesivematerials. Since polyurethane was invented by German chemist O. Bayer in the 1930s, it has been increasingly used in various industries due to its flexible formula, diverse product forms, and excellent product performance.
Polyurethane material is a multi-purpose synthetic resin with various product forms. It is widely used in transportation in the form of foam plastics, elastomers, coatings, adhesives, fibers, synthetic leather, waterproof materials and paving materials. , construction, machinery, electronic equipment, furniture, food processing, textile and clothing, synthetic leather, printing, mining and metallurgy, petrochemical industry, water conservancy, national defense, sports, medical and health and other fields. For example, the thermal conductivity of rigid polyurethane foam is lower than that of other synthetic insulation materials and natural insulation materials. It can be poured on-site and quickly formed. It is an increasingly versatile synthetic resin insulation material and is widely used in household appliances and pipeline insulation. and industrial insulation; flexible foam plastics are widely used as cushioning materials for beds, cars, boats, furniture seats, etc. due to their good elasticity and breathability; polyurethane elastomers are famous for their wear resistance, low temperature resistance, high strength, and oil resistance, and are used for Excellent special synthetic rubber for various parts of mining and oil field machinery and shoe soles; polyurethane paving materials have become standard ground materials for sports fields, runways, courts, kindergartens and other places due to their easy molding, good elasticity and wear resistance; polyurethane waterproof materials, Coatings, adhesives and sealants have become recommended CASE materials due to their easy operation, fast curing, strong adhesion, good elasticity and low temperature resistance; polyurethane elastic fiber (spandex) has high elastic recovery and high strength. It has the characteristics of becoming a commonly used fiber for elastic underwear, swimsuits, elastic socks, etc..
With the advancement of polyurethane chemical research, product manufacturing and application technology and the continuous expansion of application fields, it has gradually formed the sixth largest synthetic material in the world [polyethylene (PE), polypropylene ( PP), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), polyurethane (PU)] industrial system. In the past 20 years, the variety, application fields and industrial scale of polyurethane products have expanded rapidly, and it has become a developing industry. >蕞One of the fastest polymer synthetic materials industries. Polyurethane occupies a very important position in the materials industry, and countries are competing to develop the polyurethane resin industry.
In recent years, China's polyurethane materials have been the global growth rate蕞Quickly, the proportion of polyurethane materials in synthetic resins is also increasing. New technologies, new raw materials, and new processes are emerging one after another, and the varieties are increasing year by year.
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