Thermo PU is often used as the cover of a notepad.
Thermo PU is a thermoplastic polyurethane elastomer with a Chinese name. TPU is a polymer material made by the reaction and polymerization of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), a macromolecular polyol, and a chain extender. Its molecular structure is a rigid block obtained by the reaction of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and a chain extender, as well as diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and macromolecules. The flexible segments obtained by the polyol reaction are alternately constructed. TPU has excellent characteristics of high tension, high tension, toughness and aging resistance, and is a mature environmental protection material. At present, TPU has been widely used in medical and health, electronics and electrical, industrial and sports, etc., it has characteristics such as high strength, toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance, weather resistance and other characteristics unmatched by other plastic materials At the same time, he has many excellent functions such as high water resistance, moisture permeability, wind resistance, cold protection, antibacterial, mildew resistance, warmth, UV resistance, and energy release.
Thermoplastic polyurethane elastomer TPU can be divided into polyester type and polyether type according to molecular structure, and can be divided into injection molding grade, extrusion grade, blow molding grade and so on according to the processing method.
TPU stands for Thermoplastic Polyurethane Elastomer. It is a linear polymer material produced by the reaction of diisocyanate, macromolecular polyol, and chain extender. It is characterized by repeating urethane groups in the molecular composition, and contains other groups such as urethane, biuret, and ester bonds, ether bonds; from the perspective of molecular structure, it consists of rigid segments Alternate with the flexible segment, where the rigid segment is obtained by the reaction of diisocyanate and chain extender, and the flexible segment is obtained by the reaction of diisocyanate and macromolecular polyol. This special molecular structure makes TPU have excellent properties of other types of thermoplastic elasticity.
The main characteristics of TPU are:
High abrasion resistance: Taber abrasion index comparison between TPU and other materials
(Abrasion conditions: CS17 wheel, 1000g / wheel, 5000r / m 23 ℃)
Material Abrasion (mg) Material Abrasion (mg)
TPU 0.5-3.5 natural rubber 146
Nylon 610 16 impact resistant PVC 160
Polyester film 18 SBR 177
Nylon 11 24 Plasticized PVC 187
HDPE 29 butyl rubber 205
PF 42 ABS 275
NBR 44 CBR 280
Nylon 66 49 PS 324
LDPE 70 nylon 6 366
Wide range of hardness: By changing the ratio of each reaction component of TPU, products with different hardness can be obtained, and as the hardness decreases, the product still maintains good elasticity.
High mechanical strength: TPU products have outstanding bearing capacity, impact resistance and shock absorption performance.
Outstanding cold resistance: The glass transition temperature of TPU is relatively low, and it still maintains good elasticity, flexibility and other physical properties at minus 35 degrees.
Good processing performance: TPU can be processed by common thermoplastic material processing methods, such as injection, extrusion, calendering, and so on. At the same time, TPU is common with certain polymer materials
Processing may result in polymer alloys with complementary properties.
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