FOB Price
Obtenir le dernier prix2250 ~ 2500 / Piece
|Minimum Order
Localité:
China
Prix de commande minimale:
Commande minimale:
20 Metric Ton
Packaging Detail:
Galvanized iron drum
Delivery Time:
within 7-10 days after receiving deposit
Supplying Ability:
1000 Metric Ton per Month
Payment Type:
T/T, L/C, Western Union
Personne àcontacter Paul
Room 301, 3/F, Business Center, NO. 50, Middle HONGKONG Road, Shinan District, Qingdao, Shandong
A polyurethane (PUR and PU) is polymer composed of a chain of organic units joined by carbamate (urethane) links.
Polyurethane polymers are formed by combining two or several bi- or higher functional monomers. One contains two or more isocyanate functional groups (with formula –N=C=O) and the other contains two or more hydroxyl groups (with formula –OH). The alcohol and the isocyanate groups combine to form a urethane linkage:
ROH + R'NCO → ROC(O)N(H)R' (R and R' are alkyl or aryl
groups)
This combining process, sometimes called condensation, typically
requires the presence of a catalyst. More complicated monomers are
also used.
Polyurethanes are used in the manufacture of flexible, high-resilience foam seating; rigid foam insulation panels; microcellular foam seals and gaskets; durable elastomeric wheels and tires; automotive suspension bushings; electrical potting compounds; high performance adhesives; surface coatings and surface sealants; synthetic fibers (e.g., Spandex); carpet underlay; and hard-plastic parts (e.g., for electronic instruments).
Polyurethane is also used for the manufacture of hoses and skateboard wheels as it combines the best properties of both rubber and plastic.
