Preparation And Anti-aging Properties Of Inorganic Particles/Poly(Vinyl Chloride) Composites

Based on the research of plenty of modification upon inorganic particles, synthesis of modified inorganic particles(MIP)/PVC composite materials as well the application of MIP within PVC anti-aging, the technic of melting mixing has been taken for the preparation of modified calcium carbonate/PVC composites and modified kaolin/PVC composites. The determination reveals that those two composite materials got superior ability of anti-aging.The results are summarized below:First of all, DF/CaCO3 composite was obtained in diverse ratios, DF was observed coated on the surface of CaCO3 through FT-IR, XRD and activated rate test. To melt mix the as-prepared composite with PVC and processing aid in banbury mixer, CaCO3/PVC composite could be got. Based on the result of FT-IR, UV and whiteness retention tests, retention of whiteness got a significantly evaluation, compared with pure PVC, conjungated double bond slower the synthesis rate apparently, aid of mixture could restrain the optical aging-degradation. The test of mechanical properties and processing properties showed that with little aid of CaCO3 composites, the system of composite processing got an improvement as well as the mechanical property. With 8wt% and 16wt%, the tensile strength had been enhanced by 23.7%,24.4%, furthermore, the retention of impact strength had increased from 51.5% to 75.3% and 77.5% respectively, comparing with pure PVC. Through the observation upon the aging surface of composite materials, stress concentration dots due to the oxide degradation was recognized. Comparing with pure PVC, adding modified CaCO3 could contribute to the restrain of concentration dots.Otherwise, Kaolin coated by large molecule was utilized for the preparation of modified Kaolin/PVC composite through melt mixing. There was no change of the structure of modified Kaolin observed through FT-IR and XRD. The analysis upon the processing properties showed a small quantity of modified kaolin was contributed to the enhancement of composite system. Proper spot of kaolin could bolster the strength of toughness and intensity, which relied on the evidence of tensile and impact property test. Besides, the retention of tensile and impact property of aged composite material could also be improved by adding kaolin. Within the appending quantity of 8wt% and 16wt%, retention of tensile intensity was increased by 23.2% and 24%, the impact intensity raised from 51.5% to 77.6% and 77.8% respectively, comparing with pure PVC. Upon the characterization of FT-IR, UV and whiteness retention tests, the retention reduced slightly after aging, with an apparent restrain function in the HCl removing procedure. Through SEM on aged surface, there were much fewer defects upon the surface of composite material, comparing with the counterpart pure PVC.