Why Thermoplastic Polyurethane is Popular ?
Thermoplastic Polyurethane (TPU)
Thermoplastic polyurethane, or TPU, is a type of plastic made by reacting a diisocyanate with one or more diols in a polyaddition reaction. Because of its adaptability, it can serve as either a soft engineering plastic or a replacement for more conventional rubber.
Know more about Thermoplastic polyurethane (TPU)
Thermoplastic polyurethane (TPU) rubber/plastic (yes, both) has exceptional load-bearing capacity, high elongation at break, and enormous tensile strength due to its thermoplastic nature. The varying built-in hardness (Shore 30A–Shore – Shore100A) of the blended material allows it to be used as both soft engineering plastic and soft rubber.
Thermoplastics such as Polycarbonate and ABS greatly benefit from TPU material as a premium additive to increase their tensile strength. The flexural modulus of a composite made of TPU and ABS, or PC, can reach 150,000 psi. TPU, on the other hand, has a tensile strength of around 5076 psi.
The Production of TPU plastic
TPU is made from three primary ingredients:
A long-chain diol or polyol.
A diol or chain-extension agent
Diazinonyl ether
To create TPU plastic, a diisocyanate and one or more diols must undergo a certain reaction. This segmented block polymer has both soft and hard blocks within it.
The TPU’s tough and stiff Hard Segment is produced by a chain extruder and an isocyanate, which gives the TPU its physical performance attributes.
The TPU material’s suppleness and elastomeric properties come from its soft segment, which is made of a polyol and an isocyanate.
TPU Rubber/Plastic Characteristics
TPU characteristics can be categorized according to application and function.
Customers of sportswear, footwear, structures, and construction materials all benefit from TPU filament’s superior comfort. It has a strong potential for breathability. TPU is great if the priority is consumer comfort rather than saving money.
There should be a variety of classes used, spanning from the most luxurious to the most affordable. The highest possible grade is ten thousand g./m2/day (+560%). The average vapor transfer rate of TPU is less than 1,500 g./m2/day.Breathable materials can be added to conventional TPU to fine-tune the ventilation.
- Protection From Scratches
Thermoplastic polyurethane is superior to other thermoplastics when scratch and abrasion resistance are of paramount importance. TPU plastic’s versatility has led to its widespread use in a wide variety of industries, including the automotive, industrial, sporting goods, entertainment, and electrical sectors.
When compared to other popular thermoplastics, TPU has the highest scratch resistance due to its low weight loss during a routine wear test.
You can count on excellent color retention for your aesthetic components using aliphatic TPU. They are extremely resistant to ultraviolet light and have excellent color stability without sacrificing any functional mechanical qualities.
When considering aliphatic TPU, its properties and conformance make it ideal for use in electronic devices. Companies can leverage the benefits of its scratch and UV resistance for colored products across the board.
- Superior Transparency and Wear Resistance
Transparent and clear TPU with a high toughness can be found in many stores. This allows for its use in the extrusion of transparent films and tubes, as well as the injection molding of technical, aesthetically pleasing, or glossy parts with a thickness of up to 6 mm.
Additional Benefits
Elasticity is preserved over the entire hardness spectrum. Heat resistance, dimensional stability, fungal resistance, friction reduction, and weatherability can all be enhanced by using the right additives. Polyurethanes are protected from UV-light oxidation by additives such as UV absorbers, anti-oxidants, and stabilizers. This means that TPU can be used in applications that previously required a material with greater light or temperature stability.
Aromatic thermoplastic polyurethanes (TPUs) are another functional variant that is chemical- and microbe-resistant. Exposure to heat and UV light can significantly degrade appearance, which is a major negative. Degradation can lead to discoloration and (worst case scenario) the loss of physical qualities, although it leaves no lasting influence.
Allopathic TPU filament, on the other hand, is exceptionally lightweight and stable, and it shows no signs of yellowing or damage from UV exposure. Because of this, they can be used in applications where laminates overlap glass or glaze.
The Problems With TPU
- Time spent drying is required prior to processing.
- Expenses are higher than with similar options.
- The limited processing temperature range does little to speed up the procedure.
- The short lifespan of some grades increases the price over time.
- We need unique production settings for every major production approach.
Procedures for Working with Thermoplastic Polyurethane
Injection molding, extrusion, compression, and blow molding are just a few of the conventional techniques that can be used on TPU because it is a melt-processable material. TPU is versatile because it can be formed into a wide range of forms. In order to create laminated textiles and useful additives, TPU filaments are frequently mixed with organic solvents. Drying is essential for the process to run smoothly. Without first removing the moisture, the material will lose its physical qualities and become brittle during processing.
