The Study Of Aggregation Behavior Of New Supported Titanium Catalyst And Structural Characterization Of The Polymeric Product

The catalyst is the core technology of polyethylene industry, by improving the catalytic system, can develop more excellent performance polyethylene resin, to promote the rapid development of ethylene polymerization process.Successfully synthesized novel catalyst TiC14 supported ethoxy magnesium, static electricity using a scanning function accompanying EDX semiquantitative test component content of TS catalyst, the catalyst particle size distribution measured, the particle diameter is substantially less than 45μm.The suspension of the catalyst was studied under conditions of constant agitation, the catalyst exhibits a concentration gradient of the gravity profile, increasing the stirring speed and the storage temperature, and the catalyst particles are mixed uniformly beneficial.More systematic study of the polymerization reaction of various factors:a high reactivity in the presence of high concentrations of hydrogen, the polymerization temperature was controlled between 80℃-82℃; in the presence of hydrogen under conditions of high concentrations of hydrogen concentration Effect of changes in the melt index is more obvious, and therefore the strict control of the polymerization reactor and the hydrogen to ethylene partial pressure ratio, hydrogen and ethylene feed to maintain stability; under a hydrogen pressure of certain conditions, the ethylene pressure is increased, the melt index of the polymer and the particle size becomes small; in the polymerization system Al/Ti ratio should be controlled at 25-30; stirring rate of polymerization increases, the polymer particle size decreases; the amount of catalyst increases, the flash tank pressure increases, the polymer the number average molecular weight and weight-average molecular weight decreases; butene-1 as comonomer increases the amount, density, melting point and crystallinity of the polymer decreases, the wax content of the polymer is increased; the kettle by adjusting the dual the partial pressure can be adjusted in the solid content of the polymerization solution.Characterization of the product description:1-butene comonomer content is low, less interference of crystallization, the higher the regularity of the molecular chain, and the influence of thermal fractionation of the polymer product; TS-1 and TS-2 exhibited clear crystalline texture state, that the special structure of a crystal phase and an amorphous phase in the scale of tens of nanometers are formed in staggered; rheological performance tests show that the increase in the apparent viscosity at different shear rates in the shear rate of the role of certain, the viscosity of the TS-2 is greater than the TS-1, this is because the chain branching in the molecular chains due to higher. Analysis showed that both the mechanical properties of polyethylene tensile strength, yield strength and tensile strength less, but the elongation at break and impact strength of these three indicators vary greatly impact performance TS-2 is significantly better in TS-1, TS-1’s high crystallinity, low-monomer butene copolymer content are the causes of this gap. Resistance to environmental stress cracking resistance than the TS-1 the difference between TS-2, this is because the low-butene content in the molecular chain, resulting in poor impact strength.