聚烯烃催化剂陈化对油溶性减阻剂减阻率的影响

INFLUENCE OF POLYOLEFIN CATALYST AGING ON DRAG REDUCTION RATE OF OIL SOLUBLE DRAG REDUCER

采用陈化工艺对聚烯烃催化剂进行处理,利用室内模拟环道评价装置评价催化剂陈化与非陈化两种工艺在不同主催化剂浓度、不同助催化剂浓度下所得聚烯烃产物的减阻率,考察催化剂的陈化温度、陈化时间对聚合物减阻率的影响,并采用IR、XRD对聚合物结构进行表征。结果表明:随着主催化剂TiCl4/MgCl2用量的增加,聚合物的减阻率先增大后降低,采用陈化工艺所得聚合物的减阻率均大于非陈化工艺下所得聚合物的减阻率,且聚合物减阻率最大时对应的催化剂用量小于非陈化工艺;助催化剂Al(i-Bu)3用量大于42.9mmol/L时,陈化工艺所得聚合物的减阻率较非陈化工艺大;采用陈化工艺,在陈化温度和陈化时间分别为-2℃和10min时所得聚合物的减阻率最大,减阻率达到50%左右。IR和XRD表征结果显示,催化剂陈化不能改变聚合产物结构,但使其结晶度降低。

To examine the performance of the drag reducer produced by polyolefin catalyst, an aging process was used to treat the polyolefin catalyst TiC14/MgC12 and promoter AI（i-Bu）3. And then the drag reduction performance of polymers produced by aged catalyst （and non-aged） was tested in an in- door loop evaluation device at different concentrations of TiCl4/MgC12 and promoter AI（i-Bu）3. The effect of aging temperature and aging time on the drag reduction performance of polymer by both cata- lysts was surveyed. IR and XRD were used to characterize the prepared polymer structure. The results show that the drag reduction rate of polymer using aging catalyst is greater than that of nonaging one when the TiC14/MgC12 dosage is in 0. 597 to 1. 109 mmol/L and the AI（i-Bu）3 dosage is more than 42.9 mmol/L and that as the polyolefin catalyst dosage increase, the drag reduction rate increases first and then decreases. The polymer having maximum drag reduction rate is obtained at the aging temperature of --2 ℃ and 10 rain. Drag reduction rate can reach to 50%. The IR and XRD results show that the ag- ing process haven＇t change the structure of polymer product but makes its crystallinity decrease.