The invention discloses a rare-earth
flame-retardant heat stabilizer for a PVC (
polyvinyl chloride) sheet, the PVC sheet and a preparation method of the rare-earth
flame-retardant heat stabilizer. The heat stabilizer takes the
sodium phytate modified
magnesium-aluminum-
lanthanum rare earth hydrotalcite as a main component, has the functions of
heat stability and
flame retardance, and takes industrial inorganic
solid wastes such as the
fly ash and the
rare earth smelting waste residues as inorganic fillers, so that a synergistic effect is formed, and the overall
heat stability and flame retardance of a composite
system are improved. The prepared
rare earth flame-retardant heat stabilizer can be efficiently applied to preparation of PVC sheets, endows the sheets with good
heat stability, flame retardance and mechanical properties, and meets the safety and performance requirements in the fields of indoor decoration, building materials,
floor covering and the like. And meanwhile, the prepared environment-friendly PVC sheet is beneficial to realizing resource regeneration and comprehensive utilization of industrial
solid wastes, and the problems of
land occupation, environmental
pollution and the like caused by current
solid waste hoarding are effectively relieved.