Copper ion migration inhibitor, PBT composite material and preparation method thereof

The invention discloses a copper ion migration inhibitor for PBT (polybutylene terephthalate) resin, which comprises a component A and a component B. The component A is a hydrazide compound; the component A is phenyl phosphite ester organic matter, the component B is sulfur-containing phenyl phosphite ester organic matter, and the mass ratio of the component A to the component B is 1: (0.5-5). The invention also provides a flame-retardant reinforced PBT composite material and a preparation method thereof. The copper ion migration inhibitor for the PBT resin comprises the component A and the component B which have a synergistic effect, has the advantages of being obvious in copper ion chelating effect, resistant to migration extraction and good in durability, and can greatly inhibit product current leakage and breakdown failure risks caused by copper ion diffusion. According to the flame-retardant reinforced PBT composite material disclosed by the invention, the copper ion migration inhibitor is added, so that