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Researchers at the Karlsruhe Institute of Technology (KIT), one of Germany's leading polytechnic universities, have developed a polymer powder as an alternative to titanium dioxide in white paint. The polymer sheet powder is very thin and has a high light scattering rate.
"Titanium dioxide has a very high refractive index and can reflect almost all of the incoming light, however, titanium dioxide particles cannot degrade and, in the long run, cause environmental pollution, which is its flaw " says Professor Hendrik Hölscher of the Institute of Microstructuration Technology at the KIT Institute. Therefore, we avoid the use of pigments that are hazardous to the environment and humans by preparing porous polymer structures with comparable light scattering rates to titanium dioxide. The
researchers were inspired by the appearance of a white-gold turtle beetle in nature, with shell scales with special nanostructures that appear white.
Inspired by the appearance of this beetle, we developed a polymer substation powder with a sponge-like porous nanostructure, " says Professor Hendrik Hölscher. "
powder has ultra-thin, flexible, lightweight, mechanical stability and other characteristics, can be used to develop a variety of products. The polymer reflects more than 75% of the incoming light, and when the thickness is appropriately increased, the light reflectivity can be increased to 90%.
study was made public two months after the European Union officially declared titanium dioxide a suspected inhalation carcinogen. According to the new regulations, powdered titanium dioxide products containing more than 1% of the particle size of less than 10 m should be labeled as carcinogenic warning. For other forms of mixing, consumers need to be prompted to take precautions to minimize risk. Despite the differences, the new rules will come into force in September 2021.
, the implementation of the new regulations will give birth to a new round of technology and development, but also a new industrial pattern.
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