Study On The Process Of The Synthesis Of High Mooney Ternary EPDM

Jihua 's ethylene-propylene rubber(EPDM) unit is the one of three hundred thousand tons of ethylene projects, and it's the only equipment interiorly that can produce EPDM of ten thousand t/a at present. It adapts solution process and has 24 brands of EPDM. It is necessary to develop high Mooney EPDM for automobiles sealing with rapid development of domestic automobiles industry.In this paper, product and technology of high Mooney EPDM by using vanadium-aluminum catalyst system are developed, based on the structure data of DSM and JSR, and characteristics of EPDM process introduced from abroad by JCIG Corporation.At first, the effects of initiator compositions and its dosage, activator dosage, compositions of materials, reacting temperature, and reacting time on the co-polymerization are investigated, and the re I at i onsh i ps between properties of copolymers and parameters var i at i ons above-mentioned are obtained. The experiment results indicated that dosages of initiator affects efficiency of catalyst , and yields and [n] of copo I y me r. The yield of copolymer and viscosity of solution wi11 increase with the increase of dosage of initiator, but the efficiency of catalyst and [n] of copolymer will decrease. Al/V can affect the co-polymerization greatly in the system of vanadium-aluminum catalyst, the optimum range of AI/V is 20-40. Adding activator ETCA to catalysis system can raise concentration of active centers , increase efficiency of initiator , and adjust molecular weight of copolymer. Material compositions can affect yield, [n] and compositions of copolymer notably. The increase of propylene content will lower yield and [n]. Hydrogen can adjust molecular weight of copolymer efficiently. Reacting temperature is a main factor for co-polymerization. As reacting temperature rising will cause the decline of active center concentration and monomer concentration, andthe decrease of efficiency of catalyst and [n] of copolymer. In general temperature shall not exceed 50癈. Yield and [n] of copolymer will increase along with reacting time, so the reacting time is usually controlled between 30-60 min.Compositions .molecular weight, molecular and sequence distribution of product are characterized by GPC, infrared spectroscopy , NMR respectively. Those indexes are compared with that of DSM-4703. The results of the examinations indicated the performance of our product is the same as that of DSM-4703. The optimum technical parameter and technical conditions of EPDM production are determined considering above-mentioned factors.