TPU is short for Thermoplastic Urethane, and its Chinese name is thermoplastic polyurethane elastomer. TPU is a polymer material which is polymerized by diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), macromolecular polyol and chain extender. Its molecular structure consists of rigid blocks obtained by the reaction of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and chain extender, and flexible segments obtained by the reaction of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and macromolecular polyol. 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 care, electronic appliances, industry and sports, etc. It has the characteristics of high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance, weather resistance and so on, and it has many excellent functions such as high water resistance, moisture permeability, wind resistance, cold resistance, antibacterial, mildew resistance, warmth retention, ultraviolet resistance and energy release. 1. Thermoplastic polyurethane elastomer TPU can be divided into polyester type and polyether type according to molecular structure, and can be divided into injection grade, extrusion grade and blow molding grade according to processing methods. The main characteristics of TPU are: 1. High abrasion resistance: Taber abrasion index comparison between TPU and other materials (abrasion conditions: CS17 wheel, 1g/ wheel, 5r/ M 23℃) Material abrasion (mg) Material abrasion (mg) TPU .5-3.5 Natural rubber 146 nylon 61 16 impact-resistant PVC 16 polyester film 18 styrene-butadiene rubber 177 nylon 11 24 plasticized PVC 187 HDPE 29 butyl rubber 25 PF 42 ABS 275 NBR 44 CBR 28 nylon 66 49 PS 324 LDPE 7 nylon 6 366 2. Wide hardness range: By changing the ratio of the reaction components of TPU, products with different hardness can be obtained, and with the increase of hardness, the products still maintain good elasticity. 3. 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. 4. Good processability: TPU can be processed by common processing methods of thermoplastic materials, such as injection, extrusion, calendering and so on. At the same time, TPU and some polymer materials can be processed together to obtain polymer alloys with complementary properties. 5. Oil resistance, water resistance and mold resistance. 6. Good recycling. Second, the use of various TPU molding products: ball coupling for automobile parts; Dust cover; Pedal brake; Door lock striker; Bushing leaf spring bushing; Bearing; Shock-proof parts; Interior and exterior decorative parts; Snow chains and other mechanical and industrial parts, various gears; Seal; Shock-proof parts; Mold-taking needle; Bushing; Bearing covers; Connector; Rubber screen; Printing cots and other footwear, such as softball shoes, baseball shoes, golf shoes, football shoes soles and forefoot ladies' heels; Ski boots; Other self-aligning wheels such as safety boots; Handle; Watch band and other pipes, hoses and high-pressure pipes; Medical management; Oil pressure pipe; Pneumatic tube; Fuel pipe; Coating pipe conveying pipe; Rotating belt of film and plate such as fire hose; Air cushion; Diaphragm; Keyboard; Composite cloth and other wires and cables, power communication cables; Computer wiring; Automobile wiring; Exploration cables and other various annular pipelines; Circular belt; V-belt; Synchronous belt; Anti-skid belt equal pressing rotating belt; Soft tanks and tanks; Film composite sheets and other blow-molded boxes for various vehicles; All kinds of containers blow film ultra-thin and wide film (medical and sanitary products) solution welding material; Adhesive; Coatings of artificial leather, synthetic leather, rope, iron wire, gloves, etc. 3. TPU is mainly divided into the following types according to applications. 1. Shoe TPU is mainly used for shoe materials because of its excellent elasticity and wear resistance. The footwear products containing TPU are much superior to ordinary footwear products in wearing comfort, so they are widely used in high-grade footwear products, especially some sports shoes and casual shoes. 2. Film TPU is increasingly popular because of its superior performance and environmental protection concept. At present, TPU can be a substitute for PVC wherever it is used. TPU film can not only be attached to various fabrics, but also can be used to produce products with clear outline and stable size by vacuum thermoforming. With the continuous improvement of environmental awareness in China, the application of TPU is becoming more and more extensive. Among them, the areas that increase rapidly are: vamp lining, thermal underwear, transparent underwear, transparent shoulder strap, elastic band and medical breathable adhesive tape. 3. Adhesive TPU adhesive belongs to a kind of polyurethane adhesive. Polyurethane adhesives have been widely used in Europe and America, especially in the use of footwear adhesives. The use of TPU adhesive in China is to obtain polyurethane adhesive after TPU is dissolved and processed. In the use of TPU adhesive, Guangdong, Fujian, Zhejiang and Shanghai are the main areas. 4. Hoses TPU hoses are widely used as gas and oil hoses for aircraft, tanks, automobiles, motorcycles, machine tools and other mechanical equipment in China because of their softness, good tensile strength and impact strength. The main TPU hose manufacturers are concentrated in Guangdong, Zhejiang, Jiangsu, Shandong, Hebei and other places. 5. TPU for electric wire provides tear resistance, wear resistance and bending characteristics, and high and low temperature resistance is the key to cable performance. Therefore, in the China market, TPU for high-grade cables, such as control cables and power cables, is used to protect the coating materials of complex cables, and its application is increasingly extensive. 6. Polyurethane elastomer for roller is widely used in roller because of its high mechanical strength, excellent wear resistance, excellent oil resistance, acid and alkali resistance and outstanding compression resistance. There are mainly the following kinds of rollers in China: industrial rollers, household rollers, sports equipment wheels, medical equipment wheels and toy wheels. 7. Plastic modification can be used to plasticize PA and ABS, but the cost is high. 8. Ink TPU ink has the following main advantages: excellent adhesion, low viscosity, good bending flexibility, excellent wear resistance, high gloss and weather resistance, and can resist any sun exposure including UV irradiation, and it shows excellent toughness and durability in various application fields. The inks made of aromatic and aliphatic TPU can be used in various climatic and environmental conditions, and the products have stable and outstanding properties. TPU ink has the characteristics of smooth appearance, good shading, alcohol resistance and strong adhesion, and is mainly suitable for surface decoration of TPU and other plastics. Such as mobile phones, notebook computers, shoes, car leather chairs, sofas, high-grade leather goods, handbags, inflatable entertainment TPU products, umbrellas, raincoats and other TPU inks are used on metal and glass, with poor attach rate and easy paint peeling.