Physicochemical Property
Polyurethane is the abbreviation of polyurethane. Refers to a type that contains carbamate repeating unit links in the main chain structure.
Polymer elastomer. Its Young's modulus is between that of plastic and rubber, so it is neither plastic nor rubber. According to the processing technology, it can be
Divided into mixing polyurethane (MPU), cast polyurethane (CPU) and thermoplastic polyurethane (TPU), according to polyol
Types can be divided into polyester type (AU) and polyether type (EU). Its mechanical strength is three to four times that of PVC, and its wear resistance is five times that of NR.
to ten times, and its oil resistance is one to five times that of NBR. In addition, it also has many outstanding comprehensive physical and chemical properties, such as:
Radiation, ozone resistance, good dielectric properties, strong elasticity, elongation as high as over 500% (maximum 1000%). From physical properties
In comparison, AU, a low-hardness material, is superior. In addition, AU has better oil resistance, heat resistance and adhesion to metal, while the resistance to
In terms of hydrolysis, cold resistance and antibacterial properties, EU is better. Because the hydrolysis resistance of ether bonds is much stronger than that of carboxylate bonds (approximately
5-10 times), so EU is less susceptible to hydrolysis and is more durable than nitrile rubber (NBR) and hydrogenated nitrile rubber with low CAN content.
Resistant to oil and fuel. The emergence of lactone polyurethane elastomer has improved the hydrolysis resistance of AU, as well as its oil resistance and high temperature resistance.
Strength has also been further improved.
