Comparison between PU and TPU
Comparison between PU and TPU
Definition of PU: PU polyurethane is a polymer material. The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeating urethane groups on the main chain. It is formed by the addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compounds.
Classification of PU: thermosetting and thermoplastic. TPU is the abbreviation of thermoplastic polyurethane. In China, due to the customary name, many people call PU pipes such as PU yarn-clamped pipes and PU hoses. In fact, they are all made of TPU, which is thermoplastic PU polyurethane.
TPU (Thermoplastic polyurethanes) is a thermoplastic polyurethane elastomer rubber. It is mainly divided into polyester type and polyether type. It has a wide hardness range (60HA-85HD), wear resistance, oil resistance, transparency and good elasticity. It is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet environmental protection requirements in more and more fields.
The so-called elastomer refers to a polymer material with a glass transition temperature lower than room temperature, an elongation at break >50%, and good recovery properties after external force is removed. Polyurethane elastomer is a special category of elastomers. Polyurethane elastomer has a wide hardness range and a wide performance range. Therefore, polyurethane elastomer is a type of polymer material between rubber and plastic.
It can be heated and plasticized, and has no or little cross-linking in its chemical structure. Its molecules are basically linear, but there are certain physical cross-links. This type of polyurethane is called TPU.
The full name of PU is “polyurethane”, which is a type of synthetic leather. It is really a high-end PU material with good texture. PU is polyurethane formate.
PU leather refers to a product that uses cow or pig two-layer blue billet leather as the base leather and a layer of polyurethane film on the surface. It is also called two-layer film leather, that is, dry-process PU leather;
Wet-process PU leather is made by applying a layer of polyurethane slurry on the surface of the second-layer leather and then drying it. Due to the high cost of polyurethane coating and film, there is not much production now, and the production has switched from dry process to wet process. TPU, usually TPU95A or 90A is used to make shoe soles. It is generally divided into injection molding grade and extrusion grade. The extrusion grade is higher than the injection molding grade. Now Anta is also starting to make TPU raw materials, but it is used to make shoe materials. TPU now has a requirement that it is resistant to yellowing
The main features of TPU are:
1. 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 increases, the product still maintains good elasticity and wear resistance.
2. High mechanical strength: TPU products have outstanding load-bearing capacity, impact resistance and shock absorption performance.
3. Outstanding cold resistance: TPU has a relatively low glass transition temperature and still maintains good elasticity, flexibility and other physical properties at minus 35 degrees.
4. Good processing performance: TPU can be processed using common thermoplastic material processing methods, such as injection molding, extrusion, calendering, etc. At the same time, TPU and certain polymer materials can be processed together to obtain polymer alloys with complementary properties.
5. Oil, water and mold resistant.
6. Good recyclability.
However, TPU, as a thermoplastic polyurethane, is also divided into polyester type and polyether type. It has a wide hardness range (60HA-85HD), wear resistance, oil resistance, transparency, and good elasticity. It is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Widely used, halogen-free flame-retardant TPU can also replace soft PVC to meet environmental protection requirements in more and more fields. There are many TPU brands and grades, and the quality varies. When choosing TPU, it is best to go through detailed evaluation and demonstration, otherwise you will not get a cost-effective result.
Applications of various TPU molded products:
Automotive parts: ball couplings; dust covers; pedal brakes; door lock strikers; bushings, leaf spring bushings; bearings; anti-vibration parts; interior and exterior decorative parts; anti-skid chains, etc.
Mechanical and industrial components: various gears; seals (mainly wear-resistant and oil-resistant); anti-vibration components; mold needles; bushings; bearing caps; connectors; rubber screens; printing rubber rollers, etc.
Clothing accessories: women’s bra straps, clothing elastic bands, etc. Footwear: softball shoes, baseball shoes, golf shoes, football shoe soles and forefoot; women’s shoe heels; ski boots; safety boots, high-end soles, etc.
Others: self-positioning wheel; handle; watch strap, etc.
Pipe materials: hoses (PU hoses, PU air pipes, TPU pneumatic pipes); high-pressure pipes (PU yarn-clamped pipes, polyurethane fiber reinforced hoses); medical pipes; oil pressure pipes; pneumatic pipes; fuel pipes; coating pipes; transportation Pipes; fire hoses, etc.
Film?Plate:
Rotating belt (with certain stretching effect); air cushion; diaphragm; keyboard board; composite cloth, etc.
Wires and cables, power communication cables; computer wiring; automobile wiring; exploration cables, etc.
Others: various ring pipelines; circular belts; V-belts; timing belts; anti-slip belts, etc.
Calendering: software tanks, cans; film composite sheets, luggage fabrics, etc.
Blow molding: various vehicle boxes; various containers
Blown film: ultra-thin, wide-width film (medical, sanitary products)
Solution: welding materials; adhesives; coatings on artificial leather, synthetic leather, ropes, iron wires, gloves, etc.
The difference between PU and TPU:
PU: pu is called polyurethane. It is a general name for polymer compounds generated by the reaction of diisocyanate or polyisocyanate with compounds with more than two hydroxyl groups. Its main chain contains many repeating NHCOO groups. Commonly used diisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HDI).� Isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), polymethylene polyphenyl polyisocyanate (PAPI), xylylene 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, hard and soft foam plastic products, adhesives and coatings, etc.
Classification of PU: thermosetting and thermoplastic.
TPU: is the English abbreviation of thermoplastic polyurethane. In China, due to the customary name, many people call PU pipes such as PU yarn-clamped pipes and PU hoses. In fact, they are all made of TPU, which is thermoplastic PU polyurethane.
The main features of TPU are:
1. 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 increases, the product still maintains good elasticity and wear resistance.
2. High mechanical strength: TPU products have outstanding load-bearing capacity, impact resistance and shock absorption performance.
3. Outstanding cold resistance: TPU has a relatively low glass transition temperature and still maintains good elasticity, flexibility and other physical properties at minus 35 degrees.
4. Good processing performance: TPU can be processed using common thermoplastic material processing methods, such as injection molding, extrusion, calendering, etc. At the same time, TPU and certain polymer materials can be processed together to obtain polymer alloys with complementary properties.
5. Oil, water and mold resistant.
6. Good recyclability. However, TPU, as a thermoplastic polyurethane, is also divided into polyester type and polyether type. It has a wide hardness range (60HA-85HD), is wear-resistant, oil-resistant, transparent, and has good elasticity. It is widely used in daily necessities, sporting goods, It is widely used in toys, decorative materials and other fields. Halogen-free flame-retardant TPU can also replace soft PVC to meet the environmental protection requirements of more and more fields. There are many TPU brands and grades, and the quality varies. When choosing TPU, it is best to go through detailed evaluation and demonstration, otherwise you will not get a cost-effective result.
Applications of various TPU molded products:
Automotive parts: ball couplings; dust covers; pedal brakes; door lock strikers; bushings, leaf spring bushings; bearings; anti-vibration parts; interior and exterior decorative parts; anti-skid chains, etc.
Mechanical and industrial components: various gears; seals (mainly wear-resistant and oil-resistant); anti-vibration components; mold needles; bushings; bearing caps; connectors; rubber screens; printing rubber rollers, etc.
Clothing accessories: women’s bra straps, clothing elastic bands, etc. Footwear: softball shoes, baseball shoes, golf shoes, football shoe soles and forefoot; women’s shoe heels; ski boots; safety boots, high-end soles, etc.
Others: self-positioning wheel; handle; watch strap, etc.
Pipe materials: hoses (PU hoses, PU air pipes, TPU pneumatic pipes); high-pressure pipes (PU yarn-clamped pipes, polyurethane fiber reinforced hoses); medical pipes; oil pressure pipes; pneumatic pipes; fuel pipes; coating pipes; transportation Pipes; fire hoses and other films? Sheets: rotating belts (with a certain stretching effect); air cushions; diaphragms; keyboard boards; composite cloth and other wires? cables, power communication cables; computer wiring; automobile wiring; exploration cables Wait
Others: various ring pipelines; circular belts; V-belts; timing belts; anti-slip belts, etc.
Calendering: software tanks, cans; film composite sheets, luggage fabrics, etc.
Blow molding: various vehicle boxes; various containers
Blown film: ultra-thin, wide-width film (medical, sanitary products)
Solution: welding materials; adhesives; coatings on artificial leather, synthetic leather, ropes, iron wires, gloves, etc.
Tpu and pu are essentially made of the same material. But when making these two kinds of rubber materials. The formulas they use are not the same. 9ZSmQEL6
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