The Development Of Poly(α-Olefin) High Efficiency Drag Reduction Agents With Ultrahigh Molecular Weight

In recent years,with the sustained growth of our social industrial productivity and the continuous expansion of residents’consumption level,the consumption demand for crude oil and refined oil product has further increased.Pipeline transportation covers a smaller area,is one of the main ways of crude oil and refined oil product transportation.The use of drag reduction agents in transportation have a great effect of reducing consumption and increasing transportation.Most of the drag reduction agents used in oil transportation in China,are imported from foreign companies.Therefore,the development of high-efficiency oil transportation drag reduction agents is of great significance to get rid of the current situation of heavy dependence on imported products.In this paper,five kinds of non-metallocene catalysts were designed and synthesized,and three poly(α-olefin)s were synthesized by these non-metallocene catalysts.The effects of the experimental conditions of polymerization on the monomer conversion and viscosity average molecular weight,and the drag reduction performances of long-chain poly(α-olefin)s were verified.Five kinds of catalysts were synthesised in Chapter 2.The four kinds of non-metallocene catalysts Cat.1-Cat.4 were designed with four phenol derivatives as raw material.On the basis of Cat.4,n-butyl ether treatment was carried out to obtain Cat.5.~1H-NMR spectra showed that the hydrogen atoms on the hydroxyl group of the phenol derivatives were reacted,and the chemical shifts of other hydrogen atoms shifted with a certain extent,indicating that the metal Ti atoms were successfully combined with the ligands.In Chapter 3,the polymerization experiments 1-octene as monomer were carried out.The analysis of the polymerization results showed that the Cat.5 catalyst had the best catalytic effect.The polymerization temperature-time was-10℃for 24 h,5℃for 144 h,MAO was used as the cocatalyst,the ratio of aluminum to titanium was 50:1,and the alkylation time was 30 min.95.9%,and the viscosity average molecular weight reaches 2.08×10~6.The DSC and TG test results of the polymer could prove that its thermodynamic properties can be used at the working temperature of oil transportation,in normal.The FT-IR spectra of the poly(1-octene)showed that there is no unsaturated double bond between two carbon atoms in the polymer structure,which reduces the cause of molecular breakage due to oxidation,and can maintain the drag reduction rate for a long time.The loop drag reduction test of poly(1-octene)was carried out.The drag reduction rate of poly(1-octene)obtained with the optimal polymerization conditions could approach 46.9%,and the drag reduction performance was better than two types of EP drag reducer productions.