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Comparison between PU and TPU

Comparison between PU and TPU
PU definition: PU polyurethane is a kind of macromolecule material, polyurethane is called polyurethane, which is a general term for macromolecule compounds containing repeated carbamate groups in the main chain. It is composed of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compounds.
Classification of PU: thermosetting and thermoplasticity. TPU is the abbreviation of thermoplastic polyurethane. In China, because of the customary name, many people call PU pipes, such as PU yarn jacket, PU hoses are actually TPU, that is, thermoplastic PU polyurethane as the raw material.
TPU (Thermoplasticpolyurethanes) is called thermoplastic polyurethane elastomer rubber. It can be divided into polyester type and polyether type. Its hardness range is wide (60HA-85HD), wear resistance, oil resistance, transparency and good elasticity are widely used in daily necessities, sports goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet the environmental protection requirements in more and more fields.
PU and TPU
The so-called elastomer refers to the polymer material with good resilience after the removal of external force, whose glass transition temperature is lower than room temperature and elongation at break is more than 50%. Polyurethane elastomer is a special kind of elastomer. The hardness range of polyurethane elastomer is very wide and its performance range is very wide. Therefore, polyurethane elastomer is a kind of macromolecule material between rubber and plastics.
Thermally plasticizable, with little or no cross-linking in chemical structure, its molecules are basically linear, but there are some physical cross-linking. This type of polyurethane is called TPU.
The full name of PU is “polyurethane” which is a kind of synthetic leather. Really high-grade PU material, texture is also very good, PU is polyurethane formate.
PU leather refers to the product of two layers of blue and leather leather, which is covered with a polyurethane film on the surface. It is also called the two layer film leather, that is, dry PU leather.
Wet PU leather is made by spraying a layer of polyurethane slurry on the surface of the second layer of leather and drying it. The cost of polyurethane coating and film coating is relatively high. It has not been produced much, and has changed from dry process to wet process. TPU is usually made of TPU95A or 90A for soles. It is generally divided into injection and extrusion stages. The extrusion stage is higher than the injection stage. Now, if Anta is also starting to make TPU raw materials, but the TPU used for shoes now has a requirement of yellowing resistance.
The main features of TPU are:
1. Hardness range is wide: By changing the ratio of reaction components of TPU, products with different hardness can be obtained, and with the increase of hardness, the products still maintain good elasticity and wear resistance.
2. High mechanical strength: TPU products have outstanding bearing capacity, impact resistance and shock absorption performance.
3. Cold resistance: TPU has low glass transition temperature, and maintains good elasticity, flexibility and other physical properties at minus 35 degrees.
4. Processing performance is good: 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 mildew resistance.
6. Good regeneration and utilization.
However, as a thermoplastic polyurethane, TPU can also be divided into polyester and polyether. It has wide hardness range (60HA-85HD), wear resistance, oil resistance, transparency and good elasticity. TPU has been widely used in daily necessities, sports goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet the environmental protection in more and more fields. Requirement. TPU has many brand names and uneven quality. It is better to select TPU through detailed evaluation and demonstration, otherwise the best result of cost performance can not be obtained.
Uses of various TPU mouldings:
Automotive parts: ball coupling; dust cover; pedal brake; door lock pin; bushing, leaf spring bushing; bearing; shock-proof parts; interior and exterior decorative parts; anti-skid chain, etc.
Mechanical and industrial components: various gears; seals (mainly wear-resisting and oil-resisting); shock-proof components; die needles; bushes; bearing caps; connectors; rubber sieves; printing cots, etc.
Clothing accessories: women’s bra shoulder straps, clothing elastic bands, etc. Footwear: softball shoes, baseball shoes, golf shoes, football soles and front soles; women’s heels; ski boots; safety boots, high-end soles, etc.
Others: self-aligning wheels; handles; straps, etc.
Pipe material: hose (PU hose, PU trachea, TPU pneumatic pipe); high pressure pipe (PU yarn clamping pipe, polyurethane fiber reinforced hose); medical pipe; oil pressure pipe; pneumatic pipe; fuel pipe; coating pipe; conveyor pipe; fire water belt, etc.
Film? Plate:
Rotary belt (with certain stretching effect); air cushion; diaphragm; keyboard; composite cloth, etc.
Wire? Cable, power communication cable; Computer wiring; Automobile wiring; Exploration cable, etc.
Others: various annular pipelines; circular belt; V-belt; synchronous belt; anti-skid belt, etc.
Calendering: Soft grooves, cans; Film laminated sheet materials, box and bag fabrics, etc.
Blow moulding: all kinds of boxes for vehicles; all kinds of containers
Blowing Film: Ultra-thin, Wide Film (Medical and Sanitary Goods)
Solution: fusion material; adhesives; coatings of artificial leather, synthetic leather, rope, wire, gloves, etc.
The difference between PU and TPU:
PU: PU is called polyurethane. It is a general term for polymer compounds formed by the reaction of diisocyanate or polyisocyanate with compounds with more than two hydroxyl groups. Its main chain contains many repetitive NHCOO groups. Commonly used diisocyanates are toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), polymethylene polyphenyl polyisocyanate (PAPI), phenylene dimethylene diisocyanate (XDI), etc. According to the different hydroxyl components used, it can be divided into two types: polyester type and polyether type. It can be used to manufacture plastic products, wear resistant synthetic rubber products, synthetic fibers, rigid and soft foam plastic products, adhesives and coatings, etc.
Classification of PU: thermosetting and thermoplasticity.
TPU: It is the abbreviation of thermoplastic polyurethane. In China, because of the customary name, many people call PU pipes, such as PU yarn jacket, PU hoses are actually TPU, that is, thermoplastic PU polyurethane as the raw material.
The main features of TPU are:
1. Hardness range is wide: By changing the ratio of reaction components of TPU, products with different hardness can be obtained, and with the increase of hardness, the products still maintain good elasticity and wear resistance.
2. High mechanical strength: TPU products have outstanding bearing capacity, impact resistance and shock absorption performance.
3. Cold resistance: TPU has low glass transition temperature, and maintains good elasticity, flexibility and other physical properties at minus 35 degrees.
4. Processing performance is good: 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 mildew resistance.
6. Regeneration is good. As a thermoplastic polyurethane, TPU can also be divided into polyester and polyether. It has wide hardness range (60HA-85HD), wear resistance, oil resistance, transparency and good elasticity. TPU has been widely used in daily necessities, sports goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet the increasing demand. The more fields of environmental protection requirements. TPU has many brand names and uneven quality. It is better to select TPU through detailed evaluation and demonstration, otherwise the best result of cost performance can not be obtained.
Uses of various TPU mouldings:
Automotive parts: ball coupling; dust cover; pedal brake; door lock pin; bushing, leaf spring bushing; bearing; shock-proof parts; interior and exterior decorative parts; anti-skid chain, etc.
Mechanical and industrial components: various gears; seals (mainly wear-resisting and oil-resisting); shock-proof components; die needles; bushes; bearing caps; connectors; rubber sieves; printing cots, etc.
Clothing accessories: women’s bra shoulder straps, clothing elastic bands, etc. Footwear: softball shoes, baseball shoes, golf shoes, football soles and front soles; women’s heels; ski boots; safety boots, high-end soles, etc.
Others: self-aligning wheels; handles; straps, etc.
Pipe material: hose (PU hose, PU trachea, TPU pneumatic tube); high-pressure pipe (PU yarn jacket tube, polyurethane fiber reinforced hose); medical pipe; oil pressure pipe; pneumatic pipe; fuel pipe; coating pipe; conveyor pipe; fire water belt and other thin film? Plate: rotating belt (with a certain stretching effect); air cushion; diaphragm; keyboard; composite cloth isoelectric wire? Cable, power Communication cable; Computer wiring; Automobile wiring; Exploration cable, etc.
Others: various annular pipelines; circular belt; V-belt; synchronous belt; anti-skid belt, etc.
Calendering: Soft grooves, cans; Film laminated sheet materials, box and bag fabrics, etc.
Blow moulding: all kinds of boxes for vehicles; all kinds of containers
Blowing Film: Ultra-thin, Wide Film (Medical and Sanitary Goods)
Solution: fusion material; adhesives; coatings of artificial leather, synthetic leather, rope, wire, gloves, etc.
TPU and Pu are essentially made up of the same material. But in making these two kinds of rubber. They don’t use the same formula.

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