What are the types of polyurethane

As a raw material, polyurethane has developed rapidly since its industrial production was put on the market in the 1950s. Compared with polymer rubber materials, it has unique advantages. It can produce polyurethane products with different properties and properties through different production processes according to different use performance requirements, and is widely used in many fields. What are the types of polyurethane products?

Although the application fields of polyurethane products range from aerospace to life products such as seat cushions, and the application forms are also different, their products can be generally divided into the following categories:

1¡¢ Soft foam

The production process of this product is generally two-component liquid reaction molding, which can be made into products with uniform foam structure.

The main function of polyurethane soft foam products is cushioning, and the most representative products are shock absorption products and mattresses. This product has strong adaptability to temperature, and the compression permanent deformation of the product is not more than 10%. As a shock absorption product, it is not only used in elevators and other devices, but also in the automotive manufacturing industry's shock absorption and damping elastomer accessories.

2¡¢ Hard products

This polyurethane product is a thermosetting plastic with a closed cell structure, which has thermal insulation and waterproof functions. At present, it has the lowest thermal conductivity among all thermal insulation materials of the same layer. Polyurethane hard products are mainly used in the construction industry, such as external wall insulation board, refrigeration equipment and cold storage insulation materials, pipeline insulation materials, etc.

3¡¢ Elastomer

Polyurethane elastomers are also widely used, from mechanical parts to tires, from waterproof materials and tapes to synthetic leather and polyester fibers. It is mainly divided into three types: casting polyurethane elastomer (CPU) CPU, which is easy to form and suitable for the manufacture of large products, and can be used for synthetic leather, sports track, building waterproof materials, etc; Thermoplastic polyurethane elastomer (TPU) (TPU), which can be plasticized by heating and dissolved by solvent, has high strength, high toughness and other characteristics. It has good processing performance and can be manufactured into polyurethane fiber, insole, sports equipment, wire and cable sheath, etc.; mixed polyurethane elastomer (MPU) MPU, which has high mechanical strength, excellent chemical resistance and oil resistance. MPU is widely used in the mechanical field and plays a stable role in the humid and hot environment and oily environment. It is often made into mechanical parts such as seal rings, bearings, bushings, etc.

Polyurethane products are widely welcomed in China. At present, China has become the largest manufacturing and consumption market of polyurethane products in the world. On the basis of current applications, practitioners in the industry are still striving to innovate and develop more durable and environment-friendly polyurethane products.