Researchers in Singapore are seeking a patent for a new sound-proof and heat-resistant material made from recycled plastic bottles they say could help reduce plastic waste dumped in oceans and clogging landfills.
The National University of Singapore team said it had found a way to convert bottles made from polyethylene terephthalate (PET) into aerogels that have many potential uses – from insulation and fire safety to cleaning up oil spills.
“Plastic waste is one of the hardest wastes to recycle,” Hai Minh Duong, an associate professor at the university’s Department of Mechanical Engineering.The team had been looking for novel engineering applications to help reduce the global scourge of plastic waste.
Some eight million tonnes of plastic is dumped into oceans every year, killing marine life and entering the human food chain, according to the U.N. Environment Program.
Five Asian countries – China, Indonesia, the Philippines, Vietnam and Thailand – accounted for up to 60 percent of plastic waste leaking into oceans, according to a 2015 study.
One recycled bottle can produce an A4-sized aerogel sheet, the team said, and the material can be customized for various uses by adding surface treatments to enhance its ability to absorb and insulate.
For example, a sheet coated with fire retardant chemicals was able to withstand temperatures of up to 620 degrees Celsius. That is seven times higher than a regular thermal lining in a firefighter’s coat, and only 10 percent of the weight.
Versions of the material can also be used for heat and sound insulation in buildings, cleaning oil spills and in masks to absorb carbon monoxide. The team published its research in the scientific journal Colloids and Surfaces A in August.
It filed for a patent in March and is looking for partners to mass produce the aerogel. The cost of making a 1 meter by 1 meter by 1 cm sheet could be less than S$10 ($7.30), Duong said.
As countries struggle to cope with growing piles of plastic and other waste, Duong said their invention showed that engineering and technology can offer solutions.
“In the future, my dream is that … there will be no waste for me to recycle,” Duong said.