与锂系、钛系、钴系和镍系等合成橡胶传统催化剂相比,稀土催化剂具有均相、催化活性高、定向能力强和稳定性好等优点,是橡胶工业技术开发的首选催化剂。目前橡胶工业中采用稀土催化剂进行生产的产品主要是稀土顺丁橡胶和稀土异戊橡胶。稀土顺丁橡胶具有较高的顺式结构和最低的乙烯基单元含量,并且支化度很 Compared with the traditional catalysts of synthetic rubbers such as lithium, titanium, cobalt and nickel systems, the rare earth catalysts have the advantages of homogeneous phase, high catalytic activity, strong orientation ability and good stability, and are the preferred catalysts for the rubber industry technology development. Currently, rare earth catalysts are used in the rubber industry to produce mainly rare earth butadiene rubber and rare earth isoprene rubber. Rare earth butadiene rubber has a high cis-structure and the lowest content of vinyl units, and the degree of branching is very