Study on surface modification of ground calcium carbonate with novel modifier and its PVC filling performance

Ground calcium carbonate (GCC) are versatile due to low cost, low energy consumption, simple processing, and environmental protection. In this study, the novel modifier JST9001 was utilized for dry modification of GCC, and then polyvinyl chloride (PVC) based composites including modified GCC particles were fabricated to examine the mechanical properties. The performance indexes of activation index, wetting contact angle and dispersion stability showed that modified GCC obtained excellent modification effect at low modifier dosage (0.50 wt%). And the XRD, FT-TR, TGA, XPS and NMR measurements indicated that the JST9001 was coated on the surface of GCC particles successfully. The mechanical properties testing results demonstrated that 0.50 wt% JST9001 modified-GCC/PVC composites displayed better bending strength, bending modulus, tensile strength, tensile modulus, and impact strength compared with other dosage JST9001 modified-GCC/PVC composites. In addition, the filling content of modified GCC can reach 60 wt% in the premise of ensuring excellent mechanical properties with bending modulus of 3266.92 MPa, bending strength of 39.89 MPa, tensile modulus of 3092.13 MPa, tensile strength of 35.49 MPa and impact strength of 71.88 MPa, realizing the high filling of the modified GCC. Moreover, the modification of GCC remarkably improved the thermal stability of PVC based composites. Overall, novel modifier has the potential to reduce the cost and improve the performance of GCC/PVC composites.