If the sun is too hot, the super structure will be damaged, and the temperature of the roasting metal slides and the bleachers will be too high to be used. In order to withstand the damage of hot sunlight, researchers at the Johns Hopkins University in the United States have developed a new environmentally-friendly glass coating that reflects sunlight, keeps the building cool and makes it more durable.
The research team presented the results at the 250th National Conference and Exposition held on the 16th by the American Chemical Society (ACS).
Dr. Jason of the University’s applied physics laboratory said: “Most of the coatings used in cars or houses are based on polymers that degrade in the sun's ultraviolet rays, and after a period of time there will be chalking and yellowing. Things tend to release volatile organics and harm the environment, so we want to change from traditional polymer coatings to inorganic glass coatings."
Glass made of silicon is an ideal coating that is durable and has suitable optical properties. However, it is very fragile. According to the report of the Physicist Organization Network on August 16, in order to add this special layer to new coatings, Jason began to use one of the most abundant materials in the earth's crust, silicon. He modified the potassium silicate, which is usually dissolved in water, and made this compound into a silicate-mixed "paint" that can be sprayed on the surface of the object to dry it.
Unlike acrylic, polyurethane or epoxy coatings, this paint is almost completely inorganic and more durable than other organic compound-containing coatings. According to design, it can expand and contract with the metal surface to prevent cracking. In addition, it has a prominent feature: the ability to reflect all sunlight and passive radiant heat. Because it does not absorb sunlight, any surface that is painted with this type of paint will maintain its temperature, and even be cooler, which is the key to its ability to protect the building from sunlight.
In fact, researchers developed this new type of paint originally intended for naval vessels, but found it has many potential applications for commercial applications.
Dr. Jason said: “You can paint this kind of paint on your own roof, keep the temperature and reduce the number of summer air-conditioning bills, and use it on metal slides or bleachers. It's affordable for you. Because of the raw materials needed, it is both rich and cheap." (Reporter Hualing)
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