Recyclable glue bonds underwater in seconds and holds for years
Most glues need a dry surface to stick properly. Bonding materials underwater is challenging because water forms a thin film on any surface, so instead of an adhesive touching a material directly, it touches a layer of water, which weakens the bond. But scientists from China have now created a superglue that repels water and forms a strong, recyclable bond within seconds, as they report in a…
Scientists in China have developed a revolutionary underwater adhesive that bonds within seconds and remains strong for years. Traditional glues struggle underwater due to water formation a barrier between the adhesive and the surface. This new superglue, named BP16TPB, overcomes this challenge. The adhesive is created by mixing a supramolecular ionic liquid with a solvent called dimethyl sulfoxide (DMSO).
When applied to submerged objects like ceramic, copper, epoxy resin, or polyamide, Marangoni flow - a rapid motion triggered by surface tension differences - disrupts the thin water layer and causes the adhesive molecules to reassemble into a tough, water-resistant bond within seconds. Initial tests show the adhesive can withstand a 2-kilogram (4.4 pound) weight underwater for over three years.
It also performs well in alkaline, acidic, and salty water. Most impressively, the glue can be reused up to eight times without losing its adhesive properties. However, the adhesive loses effectiveness above 70°C (158°F). If commercialized, this underwater adhesive could be used for ship repairs, maintaining offshore platforms, and sealing leaking pipes.
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