Study On Synthesis And Application Of Rare Earth Doped With PVC Thermal Stabilizer Liquid Innoxious

Reaction takes place between rare earth ions and labile chlorine atoms of polyvinyl chloride (PVC) chain, therefore C-Cl bond stable and difficult to break which makes rare earth the property of thermal stabilization.As high quality and effective thermal stabilizer, rare earth is used in plastic processing. Recent years, standard of environment is advanced day by day and study on innoxious thermal stabilizer becomes hotspot, therefore thermal stabilizer doped with liquid innoxious rare earth is a kind of innovative material which has conformance with times needs. Additional, there is an abundance of rare earth resource in China, which provide full of substance to investigate high quality rare earth thermal stabilizer.In this paper, properties of larium isooctanate, cerium isooctanate, praseodymium isooctanate and neodymium isooctanate were researched with discoloration method,TG and test of processing performance and so on. It found that when weight ratio of rare earth was 3% used in PVC, PVC samples did not be colored obviously in 35min with discoloration method .PVC beginning degradation temperature was increased from 188℃to 212℃with the help of 7% La3+ or Ce3+, and the first step mass loss was decreased by 7.7% and 6.0% responding to La3+ and Ce3+. Neodymium salt had advantage on economizing processing energy, equilibrium torque was 40.3 N·m and maximum torque was 22.9N·m of PVC added in neodymium salt. Neodymium salt also increased PVC toughness, the maximum elongation at break was 517% of PVC added in neodymium salt. Cerium salt could increase PVC anti- tensile property remarkably, the tensile-strength was 22.9 KPa of PVC added in cerium salt.When weight ratio of rare earth were constant and atomic number of rare earth elements bordered upon each other, mono-rare earth was better than binary thermal stabilizers.Binary rare earth thermal stabilizers showed complicated static thermal stabilization in different temperature, which ought to be studied farther .Basically, thermal stabilization of quadruple rare earth thermal stabilizers was better than that of ternary.With method of electrothermal instrument heating and whiteness test, it showed that Re3+/Ca2+ thermal stabilizer caused PVC colored and Re3+/Zn2+ had the ability to keep PVC white effectively. Larium salt synergised with zinc showed remarkable.La3+/Zn2+ used in PVC and the maximum whiteness of PVC was 55.3 with discoloration method.Re3+/Ca2+/ Zn2+ could restrain zinc burning but also have PVC colored.La3+/Zn2+ was synergised with PDOP,β-diketone and ESO respectively , the best coordination existed between La3+/Zn2+ and PDOP. La3+/Zn2+/ PDOP was used in PVC, and TG curve showed that PVC beginning degradation temperature was 204℃, and first step mass lose was 74.6%.Because rare earth elements have empty 4f, 5d and 6s orbits which can accept lone electrons, and they can react coordinately with labile chlorine atoms in PVC.Thereby,rare earth have stabilization.It found that isooctanate salts added in PVC ,γC-Cl moved to wavenumber lower with IR analysis.