Jun. 01, 2019
PU Resin For Women Casual Shoes, collectively known as polyurethane, is a general term for macromolecular compounds containing repeating carbamate groups in the backbone. It is formed by the addition of an organic diisocyanate or a polyisocyanate with a dihydroxy or polyhydroxy compound. The polyurethane macromolecule may contain, in addition to the carbamate, a group such as an ether, an ester, a urea, a biuret or an allophanate. Depending on the raw materials used, there are products of different nature, generally polyester and polyether. Can be used in the manufacture of plastics, rubber, fiber, rigid and flexible foams, adhesives and coatings. Polyurethane is an emerging organic polymer material. It is known as the “fifth largest plastic” and is widely used in construction, automotive, light industry, textile, petrochemical, metallurgy, electronics, national defense, medical, for its excellent performance. Machinery and many other fields.
In 1937, Professor Otto Bayer of Germany first discovered that polyurethanes were obtained by PU Resin For Casual Shoes of polyisocyanates with polyol compounds. Based on this, they entered industrial applications. In the United States and the United States, the manufacturing technology of polyurethane resins was obtained from Germany in 1945 to 1947. Industrialization has begun. In 1955, Japan introduced polyurethane industrial production technology from Bayer Corporation of Germany and DuPont Company of the United States. At the end of the 1950s, China's polyurethane industry began to take off, and it has developed rapidly in the past 10 years.