Polymerization Process Of 1-butene And Its Product Structure And Properties

With the rapid developent of petrochemical industry in China, The development and utilization of domestic excess of 1-butene resources have not been fully used.Therefore, the research and development of 1-butene preparing PB-1 resin or PAO lubricants can be used as a good way to solve the technical problems. This paper prepared the catalyst of Ti Cl4/Mg Cl2 and bis(1-Methy-3-methylcyclopentadieneyl)zirconium dichloride, which were used respectively synthesizing isotactic polybutene-1 and low molecular weight polyethylene of butene-1,researching on the the structure and properties of the material.This article prepared Ti Cl4/Mg Cl2 catalyst, using XRD and SEM measurement which showed the prepared catalyst particles are spherical, more evenly distributed between the basic particle size at about 20~60 μm.Isotactic polybutene-1 were preparared by using Ti Cl4/Mg Cl2/-Al Et3/Donor-C catalyst, explored polymerization conditions,such as the amount of catalyst,temperature, external donor,cocatalyst and H2 that affect the reaction. The optimum polymerization conditions of 1-butene are as follows: the amount of catalyst is 10 mg,n(Al)/n(Ti)=400,T=30 ℃,P=0.15 MPa,n(Al)/n(Si)=30,t=2 h,the highest catalytic activity was of 11380g/gcat,isotacticity was 90.2%.When the polybutene-1 product in the mass fraction of unreacted monomer was less than 30%,the viscosity is low in this case, the resultant may be directly pressed to the flash tank, in this way that solved the question of the product discharge issues.Investigated the effects of different isotacticity and molecular weight that influerce the physical and mechanical properties of polybutene-1. With the increase of polybutene-1 isotacticity, the hardness of polybutene-1 first increased and then decreased, and the density increased with higher isotacticity;tensile strength increased with the improvement of isotacticity,while the elongation at break rendering decreased, complex viscosity also tends to decrease. As the molecular weight of the polybutene-1 increased, the hardness of the material increases, the density also showed the same trend; the tensile strength of the material decreases with increasing molecular weight, elongation at break and complex viscosity increases with the increase of molecular weight.Successfully prepared bis(1-butyl-3-methy-lcyclopentadienyl)zirconium dichloride(C20H30Zr Cl2) catalyst, the analysis was carried out H1-NMR andelemental analysis. Using C20H30 Zr Cl2/MAO catalytic system that.made 1-butene oligomerization to low molecular weight polybutene,explored the temperature,reaction time,amount of catalyst, n(Al)/n(Zr) the way influencing the catalyst activity and product performance.the best conditions of oligomerization are as follows:the polymerization catalyst is 8 mg, T=70 ℃, t=2.5 h, n(Al)/n(Zr)=1500,the maximum catalytic activity at this time is 3.21×104g/g cat, average molecular weight is of 3021, viscosity of 36.4mm2/s, viscosity index is of 119, pour point of-24 ℃. With this catalyst system prepared molecular weight oligomers that are between 500 to 4000,with high product selectivity, narrow molecular weight distribution, and the regular morphology of the product regular and low branching,The product viscosity is of 20~60 mm2/s that are belonging to high viscosity;viscosity index above 100, and even some more than 140, as a high-grade oil, also the pour point was below-20 ℃, so its viscosity-temperature performance is excellent.because of all of that,it can be used as diesel fuel or lubricants.