TPU Performance and Applications - Guangyuan Ruifeng New Materials

Category: TPU (popular science, no product)

Release Time: 2020-05-20

Summary: Like cast polyurethane (liquid) and blended polyurethane (solid), TPU has high modulus, high strength, high elongation and high elasticity, excellent abrasion resistance, oil resistance, low temperature resistance, and aging resistance. High tensile strength, large elongation, and low long-term compression set are all significant advantages of TPU.

I. TPU Performance

A material's widespread use is undoubtedly due to its excellent properties, and TPU is no exception. (TPU crosslinking agent manufacturer)

Like cast polyurethane (liquid) and blended polyurethane (solid), TPU possesses high modulus, high strength, high elongation and high elasticity, excellent abrasion resistance, oil resistance, low-temperature resistance, and aging resistance. High tensile strength, large elongation, and low long-term compression set are all significant advantages of TPU. (TPU crosslinking agent manufacturer)

1. High Tensile Strength, High Elongation

TPU exhibits exceptional tensile strength and elongation. TPU can meet the requirements of the food industry with little or no additives during processing, a feat difficult to achieve with other materials such as PVC and rubber. (TPU crosslinking agent manufacturer)

2. Rebound Elasticity is Highly Temperature Sensitive

TPU's rebound elasticity refers to the degree to which it quickly returns to its original state after the deformation stress is relieved, expressed as recovery energy, i.e., the ratio of the work of deformation retraction to the work required to produce the deformation. It is a function of the dynamic modulus and internal friction of the elastomer and is highly temperature sensitive. (TPU crosslinking agent manufacturer)

As expected, rebound decreases with decreasing temperature until a certain temperature at which elasticity rapidly increases. This temperature is the crystallization temperature of the soft segment, determined by the structure of the macromolecular diol; it is lower for polyether-type TPU than for polyester-type TPU. Below the crystallization temperature, the elastomer becomes hard and loses its elasticity, so the rebound is similar to the rebound from a hard metal surface. (TPU crosslinking agent manufacturer)

3. Hardness Range: Shore A60~D80

Hardness is an indicator of a material's resistance to deformation, indentation, and scratching. TPU hardness is usually measured using Shore A and Shore D durometers; Shore A is used for softer TPUs, and Shore D for harder TPUs. (TPU crosslinking agent manufacturer)

Because the hardness of TPU can be adjusted by changing the ratio of hard and soft segments, TPU has a relatively wide hardness range, from Shore A60 to D80, spanning the hardness of rubber and plastics, and exhibiting high elasticity across the entire hardness range. (TPU crosslinking agent manufacturer)

Some properties of TPU change with hardness. For example, increasing TPU hardness results in increased tensile modulus and tear strength, increased rigidity and compressive stress (load-bearing capacity), decreased elongation, increased density and dynamic heat generation, and improved environmental resistance. (TPU crosslinking agent manufacturer)

II. Applications of TPU

As a high-performance elastomer, TPU has a wide range of downstream product applications, widely used in daily necessities, sporting goods, toys, bags, and decorative materials. Here are a few examples. (TPU crosslinking agent manufacturer)

1. Footwear Materials

TPU is used in footwear materials primarily due to its excellent elasticity and abrasion resistance. Footwear containing TPU offers significantly greater comfort than ordinary footwear, making it popular in high-end footwear, especially athletic and casual shoes. (TPU crosslinking agent manufacturer)

2. Hoses

Because TPU hoses are soft and have good tensile strength, impact strength, and high and low-temperature resistance, they are widely used in China as air and oil hoses for machinery such as aircraft, tanks, automobiles, motorcycles, and machine tools. (TPU crosslinking agent manufacturer)

3. Cables

TPU provides tear resistance, abrasion resistance, and flexural characteristics, and its high and low-temperature resistance is key to cable performance. Therefore, in the Chinese market, high-grade cables such as control cables and power cables use TPU as a protective sheath material for complex cable designs, and its applications are becoming increasingly widespread. (TPU crosslinking agent manufacturer)

4. Medical Devices

TPU is a safe, stable, and high-quality alternative to PVC, free from harmful chemicals such as phthalates that could migrate into blood or other liquids in medical catheters or bags and cause side effects. Specifically developed extrusion-grade and injection-molding grade TPUs can be easily used with only minor adjustments to existing PVC equipment. (TPU crosslinking agent manufacturer)

Keywords: TPU Performance and Applications - Guangyuan Ruifeng New Materials

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