COOLING PAINT

Researchers at Purdue University, Indiana (USA) have produced a white coating to increase the cooling of buildings and reduce the global warming

The paint is capable of reflecting 98% of sunlight as well as ultraviolet (UV) rays through the atmosphere into space. During the test, this paint makes the surface temperature 4.5°C lower than ambient temperature, even in strong sunlight. It is expected that this paint can be available on the market in 1-2 years.

Prof. Xiulin Ruan with the new paint product

Reflective white paints are now much better than dark roofing materials, but only reflect 80% to 90% of sunlight and absorb UV. This means they cannot cool surfaces below ambient temperature. However, the new paint product can, resulting in decreasing requirement for air conditioners and reduced air conditioning emissions.

"Our paint can help fight global warming by helping to cool the earth, which is the amazing point." said Professor Xiulin Ruan of the research group at Purdue University. According to Prof. Xiulin Ruan, painting 93 square meters of the roof will save 10kW of electricity consumption of the air conditioner. The substance playing an important role in this new paint is barium sulfate. Unlike conventional titanium dioxide pigments, it does not absorb UV rays. This super white paint uses standard acrylic solvents and can be manufactured like conventional paints, the researchers said. The new paint will cost the same as today's paints, they added, because barium sulfate is cheaper than titanium dioxide. However, it is necessary to evaluate the durability of this paint for a longer time.

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