METHOD FOR MANUFACTURING FLEXIBLE STRAIN SENSOR Russian patent published in 2024 - IPC G01B7/16 G01L1/22 H01C17/06 

FIELD: measuring equipment.

SUBSTANCE: manufacture of a measuring device characterized by the use of electrical means for measuring the deformation of solids, used in industry to monitor elastic deformations of structures and machine parts, as sensors for robotics, etc. A method for manufacturing a flexible strain sensor involves using a recycled polyethylene terephthalate plate coated with a protective polyethylene film as a substrate. Having removed the film from one side, the plate is immersed for 1 minute in sulfuric acid with a concentration of 98 wt.%, heated to 75°C. Then washed in distilled water under the influence of ultrasound and dried in air for 12 hours. Prepare the first solution by mixing 60.37-61.84 wt.% nickel (II) nitrate hexahydrate, 0.91-1.78 wt.% N, N-dimethylformamide and 0.21-0.22 wt.% 0. 4M sodium hydroxide solution under ultrasound for 10 minutes. A second solution is prepared by mixing 34.68-35.52 wt.% terephthalic acid and 1.52-2.96 wt.% N, N -dimethylformamide under ultrasound for 10 minutes. The resulting solutions are combined and loaded into a Teflon liner of the autoclave, into which a polyethylene terephthalate substrate prepared in this manner is first placed, having removed the protective film on its other side. The autoclave is placed in a drying cabinet and hydrothermal synthesis is carried out at a temperature of 100°C for 5-7 hours. After cooling to room temperature in air, the workpiece is removed from the Teflon liner of the autoclave and washed twice with N, N -dimethylformamide, then with methanol and dried in an oven in a glass Petri dish at a pressure of 70 mbar at a temperature of 60°C for 6 hours. After this, a graphene coating of a given pattern is formed on the surface of the workpiece with a grown metal-organic framework using a laser engraver at a power of 638 mW and a laser beam speed of 9.4 mm/s, obtaining an electrically conductive layer, the electrical resistance of which changes when deformation is applied. Then, silver paste is applied to the surface formed by the graphene coating at the beginning and end of the pattern, on top of which copper tape is glued for subsequent attachment of alligator clips.

EFFECT: allows the use of a plastic waste processing product - recycled polyethylene terephthalate.

1 cl, 4 dwg