Shenyang Agricultural University researchers turn coffee waste into insulation material
In China, scientists at Shenyang Agricultural University have developed a new insulation material made almost entirely from spent coffee grounds. The team first converted discarded coffee grounds into a highly porous biochar, then blended it with ethyl cellulose, a natural polymer. The combination produced a lightweight composite with strong thermal‑insulating properties, without relying on fossil‑fuel derivatives such as expanded polystyrene.
Coffee waste normally contains limited natural porosity, which restricts its ability to trap air and block heat. The Shenyang Agricultural University team overcame this by using controlled carbonization to create a biochar with a sponge‑like internal structure. They then applied a “pore‑restoration” technique, using environmentally friendly solvents to prevent the polymer from clogging the biochar’s pores during fabrication.
The resulting material reached 0.04 W/m·K, matching the performance of commercial insulation while remaining fully biodegradable and sourced from renewable feedstocks. The findings were published recently in the peer-reviewed journal, Biochar.
Category: Chemicals & Materials
