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Study on Rheological Properties of PP Modified by Rare Earth Lanthanum

wallpapers News 2021-12-02
Study on Rheological Properties of PP Modified by Rare Earth Lanthanum
Using lanthanum oxide as a raw material, lanthanum hydroxide was prepared by chemical precipitation, and then two rare earth compounds, lanthanum benzoate, were synthesized with different proportions of lanthanum hydroxide and benzoic acid, and lanthanum benzoate and polypropylene (PP) were blended to prepare Two modified PP mixtures were obtained. The effect of lanthanum benzoate on the rheological properties of PP was studied. The results show that after lanthanum benzoate is added to PP, the PP blend system is a non-Newtonian pseudoplastic fluid, and its apparent viscosity decreases with the increase of the shear rate; with the increase of the benzoate content, the PP blend system The non-Newtonian index decreases and the rheological properties are improved; the viscous flow activation energy of the two PP blends reach 58.60 kJ/mol and 56.85 kJ/mol, respectively.
The synergistic effect of heat stabilizer between liquid lanthanum salt and calcium, zinc, and barium was studied by thermal baking method, electrical conductivity method, and thermogravimetric analysis (TG). The results show that rare earth lanthanum salt can slow down zinc burning, but La/Ca When the /Zn ternary composite heat stabilizer is used for PVC, its initial coloring phenomenon is obvious: rare earth lanthanum is used in high-zinc formulations to exert excellent zinc burning resistance. When the zinc content is 3%, the rare earth lanthanum is 4%, the PVC test piece Zinc sintering occurs after 40 minutes; the La/Ba/Zn ternary composite system has a significant synergistic effect. When La4.5%, Ba4.5%, Zn1%, at 180°C, the static thermal stability time can reach 45 minutes. The plasticizing time, plasticizing temperature, and equilibrium torque are 159S, 177°C, 18.4N·m, respectively.
Rare earth complex/polymer composite materials are a new class of inorganic/polymer materials with broad application prospects. Due to the unique chemical and physical properties of rare earths themselves, as well as the achievements in the field of optics, they are more and more popular. In this experiment, two rare earth complexes were prepared. One is to use ammonium terephthalate and o-phenanthroline to react with cerium chloride and lanthanum chloride in anhydrous ethanol solution to synthesize the rare earth complexes; the other One is to prepare two rare earth complexes with lanthanum hydroxide and benzoic acid in different proportions by melting Blending modification. Rare earth complexes are added to polypropylene with a blending ratio of 2%-6%. The optical properties, rheological properties, aggregate structure and dyeing properties of polypropylene fibers are studied after blending. And mechanical properties. The experimental results show that the blend of rare earth complex and PP is a pseudoplastic fluid, and its apparent viscosity decreases with the increase of shear rate. When the content of rare earth complex with a small ratio of raw materials is 6% , The apparent viscosity decreases the most. The apparent viscosity decreases with the increase of temperature, and decreases with the increase of the content of rare earth complexes, and the rheological properties of the blend are improved. The viscous flow activation energy E of the two rare earth complexes Reach 58.60KJ·mol-1 and 56.85KJ·mol-1, and increase with the increase of the content of rare earth complexes. The fluidity of rare earth complexes with a small ratio of raw materials is good. Moreover, the addition of rare earth complexes improves the polymerization The dyeability of acrylic fiber, the dye uptake rate is up to 70%. The rare earth complex/polymer composite material has significant performance in fluorescence performance, and can be used in light conversion membranes, biological fluorescent probes and element tracking in DNA molecules. , Has a wide range of application prospects.Study on Rheological Properties of PP Modified by Rare Earth Lanthanum
Using lanthanum oxide as raw material, lanthanum hydroxide was prepared by chemical precipitation, and then two rare earth compounds, lanthanum benzoate, were synthesized with different proportions of lanthanum hydroxide and benzoic acid, and lanthanum benzoate and polypropylene (PP) were blended to prepare Two modified PP mixtures were obtained. The effect of lanthanum benzoate on the rheological properties of PP was studied. The results show that after lanthanum benzoate is added to PP, the PP blend system is a non-Newtonian pseudoplastic fluid, and its apparent viscosity decreases with the increase of the shear rate; with the increase of the benzoate content, the PP blend system The non-Newtonian index decreases and the rheological properties are improved; the viscous flow activation energy of the two PP blends reach 58.60 kJ/mol and 56.85 kJ/mol, respectively.
The synergistic effect of heat stabilizers between liquid lanthanum salt and calcium, zinc, and barium was studied by thermal baking method, electrical conductivity method, and thermogravimetric analysis (TG). The results show that rare earth lanthanum salt can slow down zinc burning, but La/Ca When the /Zn ternary composite heat stabilizer is used for PVC, its initial coloring phenomenon is obvious: rare earth lanthanum is used in high-zinc formulations to exert excellent zinc burning resistance. When the zinc content is 3%, the rare earth lanthanum is 4%, the PVC test piece Zinc sintering occurs after 40 minutes; the La/Ba/Zn ternary composite system has a significant synergistic effect. When La4.5%, Ba4.5%, Zn1%, at 180°C, the static thermal stability time can reach 45 minutes. The plasticizing time, plasticizing temperature, and equilibrium torque are 159S, 177°C, 18.4N·m, respectively.
Rare earth complex/polymer composite materials are a new class of inorganic/polymer materials with broad application prospects. Due to the unique chemical and physical properties of rare piles of earth themselves, as well as the achievements in the field of optics, they are more and more popular. In this experiment, two rare earth complexes were prepared. One is to use ammonium terephthalate and o-phenanthroline to react with cerium chloride and lanthanum chloride in anhydrous ethanol solution to synthesize the rare earth complexes; the other One is to prepare two rare earth complexes with lanthanum hydroxide and benzoic acid in different proportions by melting Blending modification. Rare earth complexes are added to polypropylene with a blending ratio of 2%-6%. The optical properties, rheological properties, aggregate structure, and dyeing properties of polypropylene fibers are studied after blending. And mechanical properties. The experimental results show that the blend of rare-earth complex and PP is a pseudoplastic fluid, and its apparent viscosity decreases with the increase of shear rate. When the content of a rare earth complex with a small ratio of raw materials is 6%, The apparent viscosity decreases the most. The apparent viscosity decreases with the increase of temperature and decreases with the increase of the content of rare earth complexes, and the rheological properties of the blend are improved. The viscous flow activation energy E of the two rare earth complexes Reaches 58.60KJ·mol-1 and 56.85KJ·mol-1 and increases with the increase of the content of rare earth complexes. The fluidity of rare earth complexes with a small ratio of raw materials is good. Moreover, the addition of rare earth complexes improves the polymerization The dyeability of acrylic fiber, the dye uptake rate is up to 70%. The rare earth complex/polymer composite material has significant performance in fluorescence performance and can be used in light conversion membranes, biological fluorescent probes, and element tracking in DNA molecules. , Has a wide range of application prospects.
 

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