Polyurethane Pad Shock-Absorbing Wear-Resistant Rubber Sheet Meihuan Rubber & Plastic

Overview of Polyurethane

Polyurethane (PUR) refers to a large class of polymers characterized by a high number of urethane groups in the main molecular chain. It is a high molecular material that falls between plastic and rubber, featuring large elongation, a wide hardness range, extensive formulation adjustability, and excellent wear resistance and mechanical properties. Cast polyurethane elastomer (CPUR) is the most important of the three major processing types of polyurethane elastomers, accounting for 60% of PUR usage.

It offers advantages such as diverse chemical structures, easily adjustable viscosity, excellent processing techniques, ease of industrial production, convenience in use, and fast curing, making it highly suitable for manufacturing large and complex components. Polyurethane wear-resistant lining boards are produced using the cast polyurethane elastomer process. Polyurethane is a type of polymer containing urethane-type repeating structural units in its macromolecular chain, fully named polyamino acid ester, with the English full name polyurethane, abbreviated as PU or PUR. PU is the product of the reaction between polyisocyanate and polyether or polyester polyols in a specific ratio.

Properties of PU Polyurethane Elastomer: The properties of PU elastomers vary slightly depending on whether they are synthesized from polyester or polyether polyols. Polyester-type PU has high mechanical strength and good oil resistance but poorer water resistance. Polyether-type PU offers better low-temperature resistance and hydrolysis resistance than polyester-type, though its oil resistance and mechanical properties are slightly inferior.

Mechanical Properties of PU: PU elastomers have a wide hardness range, from Shore A10-A90 to D80, with an elongation at break as high as 600% to 800%. In comparison, natural rubber has a maximum Shore hardness of only A70 and an elongation at break of 550%. PU elastomers exhibit high tear strength, 2 to 5 times greater than natural rubber. They also have high resilience and excellent shock absorption. The wear resistance of PU elastomers is outstanding, being 3 to 10 times that of natural rubber.