▎ 摘　　要

NOVELTY - High thermal conductivity composite film having needle-punched opening structure is claimed. The film is made by thermal calendering of single-layer or multi-layer fiber film loaded thermally conductive fillers, and the film has needle-punched opening structure in a matrix array; thermally conductive filler is at least one of zero-dimensional thermally conductive filler, one-dimensional thermally conductive filler, two-dimensional thermally conductive filler or special-shaped thermally conductive filler. USE - The high thermal conductivity composite film is useful in the continuous production of thermally conductive composite film materials. ADVANTAGE - The composite film solves the problems of dispersed thermal network construction in thermal interface materials under the preparation conditions of existing filling methods, large interface thermal resistance between fillers, and large contact thermal resistance at the thermal interface; and has high thermal conductivity, simple preparation process, and suitable for large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for high thermal conductivity composite film having needle-punched opening structure comprising (i) adding different types of thermally conductive fillers into dispersant and dispersing to obtain different thermally conductive filler dispersions, (ii) completely immersing the fiber film layer in one of thermally conductive filler dispersions for 10-30 seconds and then drying it, immersing in the same or other thermally conductive filler dispersion for 10-30 seconds and then drying, dipping in this way for 1-10 times to obtain fibrous film layers containing thermally conductive fillers, co-spinning, spraying, and electrostatic self-assembly processes used to load the film layer with fillers, where total load of fillers is 30-200% of the amount of the fiber film, (iii) taking single-layer fiber film layer or multi-layer fiber film and stacking them neatly, then passing through the hot calendering equipment with needle rollers, selecting the perforation of certain specifications to perform acupuncture hot calendering on the fiber film layer to obtain high thermal conductivity composite film having hole diameter of 0.05-1 mm and hole spacing of 0.1-1 mm.