▎ 摘　　要

NOVELTY - The diaphragm comprises a base layer which is made of thin film of polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide or polyurethane. A reinforcing layer is made by mixing graphene, graphite powder and glue to form a mixture, drying and curing to obtain reinforcing layer. The weight ratio of graphite powder, graphene and glue in the reinforcing layer is (1-2):(5-10):(9994-9988). The reinforcing layer is adhered to the surface of said base layer. USE - Diaphragm (claimed). ADVANTAGE - The diaphragm has high adhesion, reduces the resonant frequency, increases high-frequency sound pressure, and improves the high and low frequency characteristics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of diaphragm, which involves (i) providing a thin film, glue, graphite powder and graphene, (ii) homogeneously mixing the graphite powder and graphene to form mixture (I), and mixing the mixture (I) into the glue, mixing and stirring to form mixture (II), (iii) uniformly coating mixture (ii) on the surface of the film and carrying out drying treatment, curing mixture (ii) on the film surface to obtain diaphragm.