Smoke suppressant for PVC and preparation method thereof

The invention discloses a smoke suppressant for PVC and a preparation method thereof. According to the invention, the exchangeability of hydrotalcite interlayer anions is utilized to introduce Fe(CN)6 or Fe(CN)6 into the interlayer to obtains an intercalated hydrotalcite material, which is subjected to high temperature calcination to obtain a composite oxide LDO containing Fe, and then thecomposite oxide is used as a smoke suppressant in PVC products. The preparation method provided by the invention is simple, the raw materials are low in cost, do not contain toxic or harmful substances, and have no pollution to the environment; 4phr of the smoke suppressant is added into 100g of PVC and can effectively reduce the formation and release of smoke precursor aromatic hydrocarbon compound, so that the maximum smoke density value (Ds, max) can be reduced from the 595.58 of a blank sample to 200.32, the smoke suppression rate reaches 66.37%, and the appearance and use performance ofthe material are not affec