聚烯烃弹性体技术进展

聚烯烃弹性体为一类新型乙烯与高级α-烯烃共聚物，由于应用茂金属催化技术且分子结构中引入大量高级α-烯烃共聚单体并保留一定聚乙烯结晶相而兼备可塑性和弹性，具有良好的机械性能、加工性能和热性能。聚烯烃弹性体主要生产商有Exxon公司、Dow化学公司、Mitsui公司和LG公司，均采用溶液法聚合工艺及茂金属催化技术，其中,以Dow化学公司的Insite聚合工艺与CGC茂金属催化技术为代表，限定几何构型（CGC）催化剂为桥联单茂结构催化剂，其自身结构变化对催化性能影响较大，改变桥基团、Cp环上的烷基取代基和配位基团均可得到不同结构和性能的催化剂。Exxon公司采用Exxpol茂金属催化剂开发Exact塑性体［密度(0.860~0.915) g·cm^-3］，包括乙烯-辛烯共聚物、乙烯-己烯共聚物和乙烯-丁烯共聚物;采用同种催化技术，溶液法生产丙烯基弹性体，商品名为Vitamaxx。2003年，日本Mitsui公司-三井弹性体新加坡公司100 kt·a-1的乙丙橡胶弹性体装置投产，装置采用茂金属催化技术和独有的溶液法聚合工艺，商品名为Tafmer［密度(0.862~0.905) g·cm^-3］。韩国LG公司将独特的茂金属催化剂与溶液法聚合工艺相结合，生产聚烯烃弹性体［密度(0.865~0.903) g·cm^-3］，商品名为LUCENE。我国目前没有聚烯烃弹性体生产企业，开展过一些高共聚性能茂金属催化剂的研发，应用于聚烯烃弹性体技术开发。

Technology advance in polyolefin elastomers

Polyolefin elastomers （POE） is a new type of ethylene-α-olefin copolymers.Because of the application of metallocene catalytic techniques and introduction of a large number of α-olefins into molecular structures in which certain polyethylene crystalline region is maintained,it possesses the properties of plasticity,elasticity,good mechanical properties,processability and thermal performance.Currently the major manufacturers for POE are Exxon Company,DOW Chemical Company,Mitsui Company and LG Company,and they all adopt the solution polymerization process and metallocene catalyst technology for POE production,such as the representative Insite polymerization process and CGC metallocene catalyst of DOW Chemical Company.Constrained geometry metallocene catalysts （CGC） had single bridged metallocene,and their structural changes had great effects on their catalytic performance.The catalysts with different structures and properties could be obtained by alterring bridge group,alkyl substituents on Cp ring and coordinating groups.Exxon Company developed Exact Plastomers by adopting Exxpol metallocene catalyst density （0.860-0.915） g · cm-3],including ethylene-octene copolymers,ethylene-hexene copolymers and ethylene-butene copolymers.In addition,using the same catalytic technology and solution method,Exxon Company polymerized propylene-based elastomers named Vitamaxx.In 2003,the ethylene-propylene elastomer plant of 100 kt · a-1 of Mitsui Elastomers Singapore Company was put into operation,which produced Tafmer elastomer density （0.862-0.905） g · cm-3] by using metallocene catalyst technology and a unique process of solution polymerization.LG Company of South Korean produced vinyl elastomer named LUCENE density（0.865-0.903） g · cm-3] by using metallocene catalyst and a unique solution polymerization process.At present there is not a production enterprise of POE in China.Some researches of metallocene catalysts with high copolymerization performance have been reported,which could be applied to de