Preparation source and main use of polyurethane
Polyurethane, collectively known as polyurethane, is a general term for macromolecular compounds containing repeating carbamate groups (NHCOO) 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. The structure of polyurethane, English name: polyurethane.
Preparation source
A highly divided polyurethane sub-compound formed by the action of a binary or polyvalent isocyanate with a binary or polyvalent hydroxy compound.
Polyurethane is a polymer compound containing a -NHCOO unit in a molecular structure. The unit is formed by reacting an isocyanate group with a hydroxyl group, and the reaction formula is as follows: -N=C=O+HO-→-NH- COO-
Discovery of polyurethane: In the 1930s, Otto Bayer of Germany first synthesized TPU. Around 1950, TPU appeared as a textile finishing agent in Europe, but most of them were solvent-based products for dry coating finishing. In the 1960s, water-based TPU coatings emerged as a result of increased environmental awareness and the introduction of government environmental regulations. After the 1970s, water-based PU coatings developed rapidly, and PU-coated fabrics have been widely used. Since the 1980s, breakthroughs have been made in the research and application of TPU. Compared with foreign countries, domestic research on PU textile finishing agents is late
The main purpose
Polyurethanes may have different properties depending on the raw materials used, and are generally of the polyester type and the polyether type. Can be used in the manufacture of plastics, rubber, fiber, rigid and flexible foams, adhesives and coatings.
Preparation source and main use of polyurethane