I, thermoplastic polyurethane elastomer TPU according to the molecular structure can be divided into two types of polyester type and polyether type, according to the processing method can be divided into injection molding grade, extrusion grade, blow molding grade.
The main characteristics of TPU are:
1. High abrasion resistance: TPU and other materials Taber Abrasion Index Comparison
(Abrasion conditions: CS17 wheels, 1000g/wheel, 5000r/m 23 ℃)
Materials Abrasion Amount (mg) Material Abrasion Amount (mg)
TPU 0.5- 3.5 Natural rubber 146
Nylon 610 16 Impact-resistant PVC 160
Polyester film 18 Styrene-butadiene rubber 177
Nylon 11 24 Plasticized PVC 187
HDPE 29 Butyl rubber 205
PF 42 ABS 275
Butyl hydroxy rubber 44 CBR 280
Nylon 66 49 PS 324
LDPE 70 Nylon 6 366
2. Wide range of hardness: by changing the ratio of the reaction components of TPU, you can get different hardness of the product, and with the increase of hardness, the product still maintains good elasticity.
3. High mechanical strength: TPU products have outstanding load-bearing capacity, impact resistance and shock absorption.
Outstanding cold resistance: TPU's glass transition temperature is relatively low, at -35 degrees Celsius still maintains good elasticity, flexibility and other physical properties.
4. Good processing performance: TPU can be processed using common thermoplastic material processing methods, such as injection, extrusion, calendering and so on. At the same time, TPU and some polymer materials **** with the processing of polymer alloys can be obtained with complementary properties.
5. Resistant to oil, water and mold.
6. Good recyclability.
The use of various TPU molding products:
Automotive parts
Ball coupling; dust cover; pedal brake; door lock pin; bushings
Leaf spring bushings; bearings; anti-vibration parts; internal and external decorative parts; anti-skid chain, etc.
Machinery - industrial parts
All kinds of gears; seals; anti-vibration parts; Mold removal pins; bushings; bearings
Caps; connectors; rubber sieves; printing rollers, etc.
Footwear
Softball, baseball, golf, soccer soles and forefoot
Ladies' heel; ski boots; safety boots, etc.
Other
Self-positioning wheels; grips; watch bands, etc.
Pipe and hoses
High-pressure hose; Medical hose; Hydraulic hose; Pneumatic hose; Fuel hose; Coated hose
Conveyor hose; Fire hose, etc.
Film - Sheet
Rotating belt; Air cushion; Membrane; Keyboard board; Composite fabric, etc.
Wire - Cable
Electric communication cable; Computer wiring; Automotive wiring; Exploration cable, etc.
< p>OtherVarious annular pipelines; round belts; V-belts; synchronous belts; non-slip belts, etc.
Calendering
Rotating belts; flexible tanks and cans; film composite sheets, etc.
Blow-molded
Vehicle boxes; containers
Blow-film
Ultra-thin and wide films (medical and sanitary supplies)
Soluble liquid
Soluble liquid
Blow-film
Thin and wide films (medical and sanitary supplies)
Solvent
Fusion material; adhesive; artificial leather, synthetic leather, rope, wire, gloves and other coatings
Three, TPU is mainly divided into the following according to the application
1. Shoes
TPU is used in footwear mainly due to its excellent elasticity and abrasion resistance. The wearing comfort of TPU-containing footwear is much better than that of ordinary footwear, therefore, it is more widely used in high-grade footwear, especially in some sports shoes and casual shoes.
2. Film
TPU is becoming more and more popular because of its superior performance and environmental protection concept. At present, wherever the use of PVC, TPU can become a substitute for PVC. TPU film can not only be laminated with various fabrics, but also vacuum thermoforming method to produce a clear contour, dimensional stability of the product. With the continuous improvement of domestic environmental protection awareness, the application of TPU is also more and more extensive. One of the faster increase in the field: shoe lining, thermal underwear, transparent underwear, transparent straps, elastic bands and medical use of breathable tape.
3. Adhesive
TPU adhesive belongs to a polyurethane adhesive. The use of polyurethane adhesive in Europe and the United States has been quite common, especially in the use of footwear adhesive, almost using polyurethane adhesive. The use of TPU adhesive in our country is to dissolve TPU, after processing to obtain polyurethane adhesive. In the use of TPU adhesive, mainly in Guangdong, Fujian, Zhejiang, Shanghai, four major regions.
4. Hose
Because TPU hose has a soft, good tensile strength, impact strength high and low temperature resistance, so in China TPU hose is widely used as aircraft, tanks, automobiles, motorcycles, machine tools, and other machinery and equipment such as gas and oil hoses. The main TPU hose manufacturing enterprises are concentrated in Guangdong, Zhejiang, Jiangsu, Shandong, Hebei and other places.
5. Electrical wires
TPU provides tear resistance, abrasion resistance and bending characteristics, high and low temperature resistance is the key to the performance of the cable. Therefore, in the Chinese market, higher cables such as control cables and power cables with TPU, used to protect the complex design of the cable coating material, the use is also increasingly widespread.
6. Roller
Polyurethane elastomer with its high mechanical strength, excellent abrasion resistance, excellent oil resistance, acid and alkali resistance, outstanding compression resistance and make it a large number of applications in the roller. Domestic rollers are mainly the following: industrial rollers, household rollers, sports equipment wheels, medical equipment wheels, toy wheels.
7. Plastic modification
Can be used for PA, ABS plasticizing, but the cost is higher
8. Ink
TPU ink main advantages are shown in: excellent adhesion, low viscosity, good resistance to flexing, excellent abrasion resistance, high gloss, weather resistance, can withstand any sun exposure including UV irradiation, in a variety of applications are showing excellent toughness and durability. Aromatic and aliphatic inks made of TPU can be used in a variety of climatic and environmental conditions, the product has a stable and outstanding performance.
TPU ink has a glossy and smooth appearance, good opacity and alcohol resistance, strong adhesion and other characteristics, mainly for TPU and other plastic surface decoration. Such as cell phones, laptops, shoes, car leather chairs, sofas, high-grade leather goods, handbags, inflatable entertainment TPU products, umbrellas, raincoats, etc.
TPU ink is used on metal, glass, poor adhesion, easy to drop paint.