The hottest thermoplastic polyurethane makes the s

2022-08-13
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Thermoplastic polyurethane makes the sole more impact

with the continuous improvement of people's requirements for the sole of running shoes, from 2012 to 2013, Adidas and Nike launched new products that overturn the traditional concept of running shoes by adopting new materials and processes. Adidas has adjusted the sole material significantly again after 40 years and adopted the new material boost

this material was developed by Adidas in cooperation with BASF, a large German chemical enterprise. It is foamed by TPU (thermoplastic polyurethane), a polymer material used on the surface of golf balls. In the sole part, white granular materials in the shape of polystyrene foam are stitched together

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for runners, the tool that can most affect the running state is naturally running shoes. In fact, the latest running shoes can be called the crystallization of the most cutting-edge technology. The development competition has started all over the world around lightweight, reducing the impact buffer of differential temperature difference when falling on the die mouth and contacting the plastic, enhancing the rebound force when stepping on the ground, and so on. Before that, Adidas used EVA (ethylene vinyl acetate copolymer resin) material with ethylene as the main raw material to make soles. This material has been used for nearly 40 years. EVA has the property of absorbing impact, which can reduce the impact on the body when the runner lands on the ground

the particles are placed in the mold and foamed at high temperature, so that the particles are closely combined. Running shoes with an inner length of 27cm need about 2500 particles. These particles are firmly fixed and will not scatter, in sharp contrast to the appearance of polystyrene foam

boost each particle is wrapped with air, which absorbs the impact of running through the mutual support between particles. Moreover, the durability of this material is very good, and the air enclosed in the particles is not easy to escape. Arakawa said that the experimental results showed that even after running 500km, the sole would hardly collapse. In this way, consumers no longer need to buy new shoes because the soles collapse

in addition, the newly developed boost material has no change in hardness under any temperature, which can make runners run stably. Adidas' experiments show that at minus 20 degrees and the elongation at break of ordinary polymer materials are mostly between 50% and 100% to 40 degrees above zero, the hardness of boost is constant

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