Preparation of Magnesium-Aluminum Hydrotalcite by Mechanochemical Method and Its Application as Heat Stabilizer in poly(vinyl chloride)

The traditional methods for preparing magnesium aluminum layered double hydrotalcite (Mg(2)Al-CO(3)LDHs) in industry include coprecipitation and hydrothermal methods. Both these methods have the disadvantages of high preparation cost and complicated water washing process. Using Mg(OH)(2), Al(OH)(3), and CO(2) as raw materials in this work, the Mg(2)Al-CO(3) LDHs are successfully prepared by mechanochemical method, which solves the shortcomings of traditional preparation method and realizes the conversion and utilization of CO(2) resource. The prepared Mg(2)Al-CO(3) LDHs are evaluated as a heat stabilizer in poly(vinyl chloride) (PVC). The result indicates that, when 2.4 phr Mg(2)Al-CO(3) LDHs, 0.3 phr ZnSt(2), and 0.3 phr of zinc acetylacetonate are added to the PVC, the thermal stability time of PVC can reach 190 min, which is better than PVC containing commercial Mg(2)Al-CO(3) LDHs. Meanwhile, its processing performance is basically the same as the PVC containing commercial Mg(2)Al-CO(3) LDHs.