▎ 摘　　要

NOVELTY - Electropolymerization-modified flexible contact, is a hydrogel modified flexible contact by electropolymerization method, which is performed by putting the hydrogel into a buffer solution containing a monomer capable of electropolymerization to swell, and electrifying the swollen hydrogel to conduct electropolymerization, so that the hydrogel in the hydrogel is energized. The monomers capable of electropolymerization are formed into polymers to obtain electropolymerization-modified flexible contacts. The monomer is selected from pyrrole, 3,4-ethylenedioxythiophene and aniline. The hydrogel is selected from polyacrylic acid, cellulose, hydroxyethyl cellulose, sodium alginate, gelatin, acrylic acid, polyvinyl alcohol, hydroxyethyl methacrylate, polyoxyethylene, and polyacrylic acid. The combination of sodium polystyrene sulfonate, 4-ethylenedioxythiophene, carboxylated carbon nanotubes or graphene oxide is added to the buffer solution. USE - Electric-aggregate modified flexible contact for use in a hydrogel semi-dry electrode of a wearable EEG device or medical EEG machine (all claimed). ADVANTAGE - The semi-dry electrode is simple in structure, capable of self-supplementing electrolyte, with good mechanical strength and flexibility, and capable of collecting EEG electrical signal, and has high signal-to-noise ratio, and can effectively prevent the movement contact by the impedance change and motion signal false. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a method for preparing electropolymerization-modified flexible contact, which involves: putting the hydrogel into a buffer solution containing a monomer capable of electropolymerization to swell; electrifying the swollen hydrogel to carry out electropolymerization, before the hydrogel is put into the buffer for swelling, assembling the hydrogel with the cup-shaped electrode, and energizing cup-shaped electrode to carry out an electropolymerization reaction; 2. a hydrogel semi-dry electrode, which comprises the flexible contact, electrode fixing groove, base and elastomer. The flexible contacts comprise metal-plated cup electrodes, the electrode fixing groove fix the flexible contact at the top and accommodate the metal-plated cup-shaped electrode, and at the same time make the metal-plated cup-shaped electrode in contact with the flexible contact, the base is connected and fixed with the electrode fixing groove, the elastic body is placed inside the base and is in contact with the bottom of the electrode fixing groove. The electropolymerization-modified flexible contacts are chemically modified in situ by electrification after the hydrogel semi-dry electrode is assembled; and 3. a wearable electroencephalogram (EEG) device or a medical EEG machine, which comprises hydrogel semi-dry electrode, and a cap body for fixing the hydrogel semi-dry electrode, which are detachably connected.