Polyurethane is a polymer containing carbamate groups in the main chain of macromolecules, which is called polyurethane. Polyurethane can be divided into two categories: polyester polyurethane and polyether polyurethane. Polyester is polyurethane prepared from diisocyanate and hydroxyl-terminated polyester. Polyether polyurethane is polyurethane prepared from diisocyanate and hydroxyl-terminated polyether.
Polyurethane has many excellent properties, so it is widely used. PU leather is now widely used in the decoration of luggage, clothing, shoes, vehicles and furniture, and is increasingly recognized by the market. Its wide application range, quantity and variety are beyond the satisfaction of traditional natural leather.
Extended data:
Performance and application:
Because the groups contained in polyurethane macromolecules are all strongly polar groups, and the macromolecules also contain polyether or polyester flexible segments, polyurethane has the following characteristics:
1, high mechanical strength and oxidation stability;
2. It has high flexibility and elasticity;
3. Excellent oil resistance, solvent resistance, water resistance and fire resistance.
Polyurethane is mainly used as polyurethane synthetic leather, polyurethane foam, polyurethane coating, polyurethane adhesive, polyurethane rubber (elastomer) and polyurethane fiber. In addition, polyurethane is also used in civil engineering, address drilling, mining and petroleum engineering to stop water and stabilize buildings or subgrade; As a pavement material, it is used in the runways of sports fields, indoor floors of buildings and so on.
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