▎ 摘　　要

NOVELTY - Graphene oxide mixed slurry comprises graphene oxide, solvent or auxiliary agent, where the graphene oxide comprises large-scale graphene oxide and small scale graphene oxide. USE - Graphene oxide mixed slurry for graphene oxide composite film and graphene heat-conducting film. ADVANTAGE - The double-scale range graphene oxide mixed slurry: utilizes the large scale graphene oxide slurry, which overcomes the problems of coating after coating, drying time, energy consumption, internal structure defect and surface appearance, and limited by the small scale graphite the self-characteristics, it is easy to form more than 100? m of graphene thick film; and provides the graphene oxide composite film, which has high heat conducting coefficient and controllable film thickness. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. A method for preparing graphene oxide mixed slurry with double-scale range, which involves firstly preparing small scale graphene oxide dispersion liquid, then adding the large scale graphene oxide or auxiliary agent adding dispersion liquid, mixing or dispersing to obtain the graphene oxide mixed slurry with double-scale range. 2. A graphene oxide composite film with double-scale range, which comprises a large scale graphene oxide and small scale graphene oxide, the mass ratio of the small scale graphene oxide and large scale oxidized graphite is greater than or equal to 1: 100 and less than or equal to 10000: 1. 3. A method for preparing graphene heat-conducting film, which involves preparing a dual-scale-range graphene oxide composite membrane and carrying out high-temperature treatment on the composite film in a protective atmosphere, cooling to room temperature after the high-temperature treatment and compacting the composite film by using a press to obtain the high-performance graphene heat-conducting film. 4. A graphene heat-conducting film.