TPU Chinese name: thermoplastic polyurethane. Thermoplastic TPU elastomer, because of its good elasticity, good physical properties and excellent mechanical strength, is widely used in injection, extrusion, calendering and dissolution into solution type resins. It is a plastic material often used by plastics manufacturers. Its products cover a range of industrial applications and consumer necessities. The following China Plastics Network - Jiuzhi Plastics Network takes everyone to look at the characteristics of TPU plastic materials :
1. Wear resistance
When the material is often subjected to mechanical action such as friction, scraping, and frustration during use, it will cause the surface to wear gradually, so the choice of material wear is very important. TPU plastic raw materials have excellent wear resistance and are more than five times more wear-resistant than natural rubber. It is one of the preferred materials for wear-resistant products.
2. Tensile properties
The tensile strength is up to 70 MPa and the elongation at break can be as high as 1000%.
3. Tearing performance
When the elastomer is applied, the damage caused by the expansion of the crack is called tearing. The tear strength is the ability of the material to resist the tearing effect; in general, the TPU has high tear resistance, tear strength and some commonly used Rubber and plastic are quite excellent.
4. Inflection performance
Many plastic materials are prone to breakage under repeated cyclic stress. TPU products can maintain excellent fracture resistance under different environments, and are one of the best choices for polymer materials.
5. Hydrolysis resistance
TPU has good water resistance under turbidity, and no obvious hydrolysis occurs in 1 to 2 years, especially in the polyether series. The polyester series is immersed in 50 ° C water for half a year or 70 ° C for 3 weeks or 100 ° C for 3 to 4 days, it will completely decompose. This is one of the reasons why TPU is suitable as an environmentally friendly material. It is recommended to use the polyether series.
6. High temperature resistance and oxidation resistance
The general plastic raw materials are easily oxidized in the environment above 70 ° C for a long time, and the TPU has good oxidation resistance; in general, the temperature resistance of the TPU can reach 120 ° C.
7. Oil and chemical resistance
TPU is a kind of strong polar polymer material with low affinity with non-polar mineral oil. It is almost unaffected in fuel oils (such as kerosene, gasoline) and mechanical oils (such as hydraulic oil, lubricating oil, etc.). Erosion; among them, TPU products have better oil resistance in polyester series; TPU film and sheet have little change in volume of grease, and tensile strength is even higher than the original initial value; it should be noted that in mineral oil If a small amount of water is contained, it will have different degrees of negative effects on the physical properties of the film.
8. Low temperature performance
TPU has very good low temperature resistance, usually can reach -50 °C, can replace the general field of PVC can not be applied due to low temperature embrittlement, especially suitable for cold-related products.
9. Air tightness
TPU is very easy to weld with high frequency or hot pressing, so it is widely used in inflatable products. The gas coefficient refers to the rate at which a gas passes through a predetermined area of ​​a sample at a certain temperature and pressure. The transmittance of the same material to different gases sometimes varies greatly. In general, polyester series products are more airtight than polyether series.
10. Biomedical performance
TPU has excellent biocompatibility, non-toxicity, no allergic reaction, no local irritation, and no pyrogenicity. Therefore, it is widely used in medical, health and other related products and sports and protective equipment.
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