▎ 摘　　要

NOVELTY - Production of self-repairing graphene-based pressure sensor comprises preparing one-dimensional silver nanowire material by heating ethylene glycol, adding sodium chloride solution and silver nitrate solution, dripping polyvinylpyrrolidone solution, standing, centrifuging, and washing with water and ethanol; preparing graphene silver nanowire composite conductor by adding carboxymethylcellulose or hydroxyethylcellulose to solvent, adding expanded graphite, centrifuging, adding silver nanowires, stirring and sonicating; preparing graphene self-repairing polymer materials; and packaging. USE - Method for producing self-repairing graphene-based pressure sensor (claimed). ADVANTAGE - The method reduces hard agglomeration problem, and eases formation of three-dimensional crosslinked network structure. It has long service life, high conductivity, and high sensitivity. DETAILED DESCRIPTION - Production of self-repairing graphene-based pressure sensor comprises: (A) preparing one-dimensional silver nanowire material by adding 50100 mL ethylene glycol to three-necked flask, and heating at 150-170 degrees C for 10-30 minutes; adding 1-4 ml 0.002-0.004 mol/L sodium chloride solution, and heating for 10-15 minutes; dissolving silver nitrate in ethylene glycol to form 0.3-0.5 mol/L silver nitrate solution, dissolving polyvinylpyrrolidone (PVP) in ethylene glycol to form 0.4-0.6 mol/L PVP solution, taking 10-15 ml silver nitrate solution, adding to mixed solution, taking 30-45 ml of PVP solution, and slowly dripping for 50-90 minutes; and taking out reaction solution, standing at room temperature, centrifuging at 9000 revolutions/minute for 10 minutes, and washing with deionized water and ethanol to get powdery product; (B) preparing graphene silver nanowire composite conductor by adding carboxymethylcellulose or hydroxyethylcellulose to solvent to form homogeneous solution, adding expanded graphite to homogeneous solution to obtain expanded graphite having concentration of 0.1-0.9 mg/mL dispersion solution, ultrasonic dispersing for 14-20 hours, and centrifuging at 8000 revolutions/minute for 30 minutes; and adding silver nanowires obtained in first step, mechanical stirring at 500 revolutions/minute for 2-6 hours, and sonicating for 3 hours; (C) preparing graphene self-repairing polymer materials by taking dimer acid and diethylenetriamine into three-necked flask with nitrogen as protective gas, heating to 150-170 degrees C, mechanical stirring, and reacting for 20-26 hours to form polymer; adding to methylene chloride at mass ratio of 1:1-1:5, adding graphene silver nanowire composite conductor to dichloromethane, standing for 12 hours, taking out lower layer, and heating in oven at 50 degrees C for 48 hours; weighing urea, adding to purified mixture, crosslinking at 130-145 degrees C for 2-12 hours and taking self-repairing graphene-based polymer materials; and curing in mold at 160 degrees C for 2 hours; and (D) packaging using conductive metal thin film made of gold, silver, platinum and copper, and coating with flexible protective layer made of polydimethylsiloxane, polyethylene and/or polyethylene glycol esters. The mass ratio of cellulose and expanded graphite is 5:1-10:1. The solvent is acetone, ethanol, tetrahydrofuran and/or dichloromethane. The mass ratio of dimer acid and diethylenetriamine is 2:1-3:1. The mass ratio of solid particles to polymer is 0-55:100. The volume ratio of dichloromethane, methanol and water is 3:1:2.