Scientists have developed a new way to cure adhesive using a magnetic field.
Epoxy resins typically cure by exposure to ultraviolet light, heat, or air. However, the first option is not suitable for bonding opaque materials, the second crystallization method can damage bonded materials with good insulating characteristics and require significant energy consumption, and the third requires two-component adhesives..
Researchers at Nanyang Technological University have modified a thermally activated epoxy resin to quickly cure with a magnetic field. To do this, the team added iron, zinc and manganese nanoparticles to the traditional glue composition..
While in the magnetic field, the admixture of metal dust heats up, curing the epoxy without the need for a catalyst. This method activates substance regardless of the properties of the bonded material.
For curing 1 g of this adhesive it is enough to place it in a 200 W electromagnetic device for five minutes. At room temperature, the crystallization process requires only 16.6 Wh of energy, which is about 120 times less than that required for conventional thermally activated epoxy. Curing speed and temperature can be adjusted.
New epoxy resin hardens quickly with magnetic field
Because the new method bonds materials just as well, it can be applied to medical, automotive, aerospace and sports products. It can be obtained by adding magnetic nanoparticles to commercially available adhesives..
Recently, a next generation glue has also been developed that turns into gas during the removal process. from the surface.
text: Ilya Bauer, photo and video: NTU Singapore