▎ 摘　　要

NOVELTY - Interlayer structure high heat-conducting composite film, where the composite film has a three-layer structure comprising upper and lower elastic surface fiber film layer, and the middle non-elastic fiber film layer hot rolling composite, where the elastic fiber film layer and non-elastic fiber film layer both contain zero-dimensional, one-dimensional thermally conductive fillers, two-dimensional thermally conductive fillers and/or special-shaped thermally conductive fillers, is claimed. USE - The composite film is useful in thermal interface management field of electronic device. ADVANTAGE - The film: solves the problems of difficulty in building a heat-conducting network in heat interface materials under the preparation conditions of conventional filling methods, large interface thermal resistance between fillers and thermal interface contact resistance; has simple preparation process; and easily realizes large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite film, comprising (i) adding different heat-conducting conductive filler into deionized water and surface modifier for uniformly dispersing to obtain different heat-conducting filler dispersions, (ii) adding surface modifier into mixed solution of deionized water and absolute ethyl alcohol for uniformly dispersing to obtain a surface modifier solution, (iii) fully soaking elastic fiber film and inelastic fiber film in the surface modifier solution prepared in the step (ii) for 10-30 seconds respectively to obtain surface-modified elastic fiber films and inelastic fiber films, (iv) soaking surface-modified elastic fiber film and inelastic fiber film obtained in the step (iii) into one of different heat-conducting filler dispersion liquids obtained in the step (i) for 10-30 seconds, respectively, drying at 50-80°C after each soaking in heat-conducting filler dispersion, then soaking in heat-conducting filler dispersion, drying, repeating the surface modification and adsorption process for 2-10 times, and uniformly adsorbing the elastic fiber film and inelastic fiber film with zero-dimensional heat-conducting filler, one-dimensional heat-conducting filler, two-dimensional heat-conducting filler and special-shaped heat-conducting filler, and (v) carrying out first hot rolling of inelastic fiber film with adsorbent filler obtained in the step (iv), placing elastic fiber film for adsorbing filler obtained in the step (iv) on the upper and lower surfaces of the inelastic fiber film after hot pressing, and performing second hot rolling to obtain the finished product.preparation method structure high heat-conducting composite film.