合成树脂及塑料
閤成樹脂及塑料
합성수지급소료
CHINA SYNTHETIC RESIN AND PLASTICS
2015年
1期
80-83
,共4页
乙烯聚合%铬系催化剂%钛改性%表面浸渍法%共凝胶法
乙烯聚閤%鉻繫催化劑%鈦改性%錶麵浸漬法%共凝膠法
을희취합%락계최화제%태개성%표면침지법%공응효법
ethylene polymerization%chromium catalyst%titanium modification%surface-impregnated method%congelled method
综述了钛改性铬系催化剂的国内外研发现状、制备方法、性能以及对乙烯聚合性能的影响。与用表面浸渍法制备的钛改性铬系催化剂相比，用共凝胶法制备的钛改性铬系催化剂可以缩短诱导期，提高聚乙烯（PE）的熔体流动速率。钛改性铬系催化剂中的钛可阻止α-烯烃在PE的低相对分子质量部分插入，有效降低了含支链低相对分子质量PE的含量。随着钛的加入，低相对分子质量部分的共聚支链减少，从而可改变PE的支链分布。钛改性铬系催化剂的聚合性能明显改善，制备的聚乙烯性能优异。
綜述瞭鈦改性鉻繫催化劑的國內外研髮現狀、製備方法、性能以及對乙烯聚閤性能的影響。與用錶麵浸漬法製備的鈦改性鉻繫催化劑相比，用共凝膠法製備的鈦改性鉻繫催化劑可以縮短誘導期，提高聚乙烯（PE）的鎔體流動速率。鈦改性鉻繫催化劑中的鈦可阻止α-烯烴在PE的低相對分子質量部分插入，有效降低瞭含支鏈低相對分子質量PE的含量。隨著鈦的加入，低相對分子質量部分的共聚支鏈減少，從而可改變PE的支鏈分佈。鈦改性鉻繫催化劑的聚閤性能明顯改善，製備的聚乙烯性能優異。
종술료태개성락계최화제적국내외연발현상、제비방법、성능이급대을희취합성능적영향。여용표면침지법제비적태개성락계최화제상비，용공응효법제비적태개성락계최화제가이축단유도기，제고취을희（PE）적용체류동속솔。태개성락계최화제중적태가조지α-희경재PE적저상대분자질량부분삽입，유효강저료함지련저상대분자질량PE적함량。수착태적가입，저상대분자질량부분적공취지련감소，종이가개변PE적지련분포。태개성락계최화제적취합성능명현개선，제비적취을희성능우이。
The?research?status?at?home?and?abroad,preparation?method,performances?of?Ti?modified?chro-mium?catalyst,and?the?effects?of?the?catalyst?on?ethylene?polymerization?were?summarized.?Compared?with?the?ti-tanium?modified?chromium?catalyst?prepared?by?surface-impregnated?method,the?catalyst?prepared?by?congelled?method?could?shorten?the?induced?time?and?improve?the?melt?flow?rate?of?the?polyethylene(PE).?The?presence?of?titanium?in?the?titanium?modified?chromium?catalyst?could?inhibit?the?incorporation?of?alpha?olefin?into?the?low?relative?molecular?mass?part?of?PE?and?decrease?the?content?of?low?relative?molecular?mass?PE?with?branch.?The?copolymerized?branch?in?low?relative?molecular?part?reduced?with?the?addition?of?titanium,so?the?branch?distri-bution?of?PE?could?be?modified.?The?polymerization?performances?of?the?titanium?modified?chromium?catalysts?were?improved?remarkably,and?the?performances?of?the?resultant?PE?were?excellent.
