Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

Abstract

Bean dreg (BD)–hydrocalumite composites were prepared by a hydrothermal method with BD, Ca(OH) 2 , Al(OH) 3 , and Na 2 CO 3 as raw materials. The samples were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 physical adsorption–desorption. Their properties as a thermal stabilizer for poly(vinyl chloride) were tested using a torque rheometer and static thermal aging method. Compared with traditional hydrocalumite, the crystal size of the BD–hydrocalumite composite was relatively small, which made it exhibit good dispersion and better thermal stability for poly(vinyl chloride). In addition, the effects of preparation conditions on the properties of BD–hydrocalumite as a heat stabilizer were also investigated. Under the conditions of n [Ca(OH) 2 /Al(OH) 3 /Na 2 CO 3 ] = 4.4:2:1, a BD dosage of 5%, a crystallization temperature of 90 °C, and 19 h, the prepared BD–hydrocalumite showed the best performance, and the dynamic thermal stability time of poly(vinyl chloride) reached 2149 s.