▎ 摘　　要

NOVELTY - Preparing wave-absorbing bismaleimide resin comprises (1) mixing bismaleimide resin, epoxy resin and absorbent into the internal mixer for banburying and coarse mixing to obtain crude mixed absorption bismaleimide resin, (2) introducing crude mixed absorbent bismaleimide resin into the open mill for refining and refining to obtain fine mixed wave-absorbing bismaleimide resin, introducing curing agent into the fine mixed wave-absorbing bismaleimide resin to obtain the wave-absorbing bismaleimide resin curing system, where curing agent is fatty amine curing agent, polyamide curing agent, aromatic amine curing agent, polyether amine curing agent, dicyandiamide curing agent, anhydride curing agent, and (3) different temperature stage trigger curing in curing system. USE - The method is useful for preparing wave-absorbing bismaleimide resin. ADVANTAGE - The resin has different viscosity in different process, which is better for dispersing the absorbent uniformly, which is better for rolling forming, and has better absorbing performance and stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing wave absorbing bismaleimide resin composite material, comprising (a) introducing bismuth resin, epoxy resin and absorbent into the Banbury mixer and carrying out banburying and rough mixing to obtain the coarsely mixed absorbing bismuth resin, (b) introducing rough mixed wave absorbing bismaleimide resin obtained in step (a) into an open mill to carry out open refining and mixing, to obtain a finely mixed wave-absorbing bismaleimide resin, and then add a curing agent to the finely mixed wave-absorbing bismaleimide resin, and obtaining wave-absorbing bismaleimide resin curing system; where the curing agent is aliphatic amine curing agent, polyamide curing agent, aromatic amine curing agent, polyetheramine curing agent, dicyandiamide curing agent and/or acid anhydride curing agent, (c) triggering the curing of the wave-absorbing bismuth resin curing system obtained in step (b) at least in a low temperature stage to obtain wave-absorbing bismuth resin blank, and placing the wave-absorbing bismuth resin blank into a calender to carry out, calendering to obtain a wave-absorbing bismaleimide resin film; d) Lay up multiple layers of the wave-absorbing bismaleimide resin film, and then trigger curing in at least one high temperature stage to obtain a wave-absorbing bismaleimide resin composite material (1) wave-absorbing bismaleimide resin that is made by the preparation method DESCRIPTION OF DRAWING(S) - The drawing shows a process flow chart of preparing the wave absorbing bismaleimide resin (Drawing includes non-English language text).