Polyurethane Elastic Materials

Polyurethane Elastic Materials

Polyurethane elastic materials are block polymers, that is, polyurethane macromolecules are composed of "soft segments" and "hard segments" and form a microscopic phase separation structure, in which the hard segments (derived from isocyanate and chain extenders) are dispersed in the soft segment phase area ( Derived from oligomer polyols), it serves as a physical cross-linking point. Therefore, compared with other synthetic rubbers (elastomers), polyurethane elastomers have better strength and wear resistance, and can maintain high elongation even when hardness is high. Growth rate.

Elastic polyurethane materials mainly include traditional polyurethane elastomer products, polyurethane plastic track and other paving materials, polyurethane waterproof coatings, adhesives, sealants, potting glues, etc., accounting for about 40% of the total polyurethane products, the vast majority The cured product of most CASE materials (after removing water and solvent from water-based and solvent-based products) is a non-foam elastic polyurethane material. Among them, PU synthetic leather resin, some coatings and adhesives are solvent-based or water-based products, and can also be considered as polyurethane elastomer materials in a broad sense. Polyurethane elastomers in a narrow sense refer to cast polyurethane elastomer (CPU), thermoplastic polyurethane elastomer (TPU) and mixed polyurethane elastomer (MPU), accounting for 10% or slightly less of the total polyurethane, among which CPU and TPU are The main polyurethane elastomers differ in factors such as production processes and chain extenders. This type of traditional polyurethane elastomer is also called "polyurethane rubber" and belongs to a type of special synthetic rubber. High-performance polyurethane elastomer has the best wear resistance among all synthetic polymer materials and is known as the "King of Wear Resistance". It is widely used in many fields, and new applications are still being developed.

Polyurethane elastomers can be used to replace metals, plastics and ordinary rubber in some areas.

Compared with metal materials, polyurethane elastomer has the advantages of light weight, low noise, loss resistance, low processing cost and acid corrosion resistance. Compared with plastic, it has the advantages of high toughness and high wear resistance. Compared with ordinary rubber, polyurethane elastomer has the advantages of wear resistance, cut resistance, tear resistance, high load-bearing capacity, ozone resistance, etc. It is simple to manufacture, can be potted and cast, and has a wide hardness range.

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