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(1) 1,7-octadiene. US Shell used 1,7-octadiene as the third monomer to synthesize EPDM rubber with highly random copolymerization and good processability. The catalyst uses a highly active stereoselective catalyst to synthesize ethylene, propylene and 1,7-octadiene into EPDM rubber products;
(2) 6,10-Dimethyl-1,5,9-undecene. Japan’s Mitsui Petrochemical Corporation developed a new unsaturated ethylene polymer rubber in 1996. It is based on 6,10-dimethyl 1,5,9-undetriene as the third monomer in the metallocene double ( The EPDM rubber was prepared in the presence of 1,3-dimethylcyclopentadienyl zirconium dichloride and methylaluminoxane. This EPDM rubber not only vulcanizes fast but also has good heat resistance, weather resistance and ozone oxidation resistance.
(3) 3,7-Dimethyl-1,6-octadiene and 5,7-dimethyl-1,6-octadiene. French researchers will incorporate linear non-conjugated dienes: 3,7-dimethyl-1,6-octadiene (3,7-DMO for short) and 5,7-dimethyl-1,6-octadiene (5,7-DMO for short) was used as the third monomer to synthesize EPDM rubber in the presence of racemic-ethyldithiozirconium dichloride/MAO metallocene catalyst system. Studies have shown that this diene is a more desirable third monomer for industrial synthesis of EPDM, and metallocenes can be used as catalysts for the preparation of EDPM with a linear diene such as 5,7-DMO and 3,7-DMO as the third monomer. This EDPM has a uniform chemical composition and controllable structure;
(4) 7-Methyl-1,6-octadiene. Japan Synthetic Rubber Co., Ltd. developed 7-methyl-1,6-octadiene as the third monomer, developed a number average molecular weight of 7000, a weight average molecular weight of 359,000, and an iodine value of 14, m (ethylene): m (propylene). ) = 28:71 EDPM rubber. The vulcanization rate of this rubber is much faster than that of EP24 developed by Japan Synthetic Rubber. In addition, the third monomer studied was 1,3-butadiene, styrene, and hydrazine. The application of metallocene catalysts provides a wider choice of ethylene propylene third monomer.
New Third Monomer Used for Producing EPDM Rubber
So far, the third monomer used for the industrial production of ethylene propylene diene monomer (EPDM) is ethylidene norbornene (ENB), dicyclopentadiene (DCPD) and 1,4-hexadiene. 1,4-Hexadiene used as the third monomer only DuPont company. With the continuous development of EPDM rubber production technology, people have also developed and developed some new third monomers for the production of EPDM rubber, mainly in the following categories.