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制备出了以二醚为内给电子体的Ziegler-Natta(Z-N)催化剂及Z-N/茂金属(Z-M)复合催化剂。研究了催化剂类型(Z-N或Z-M)、休眠剂类型(苯乙烯(St)或对甲基苯乙烯(pMS))及用量对聚合过程、中间产品(均聚聚丙烯(PP))和最终产品(PP釜内合金)性能的影响,还利用扫描电子显微镜观测了PP釜内合金粒子的形貌。结果表明:St是比pMS更适宜的休眠剂;在保证使Z-M复合催化剂中茂金属组分充分休眠的前提下,应尽可能降低休眠剂的加入量;在St休眠剂存在下使用Z-M复合催化剂可制得23,-30℃抗冲击强度分别为47,5.6 kJ/m2的高刚高韧PP合金。 相似文献
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Ziegler-Natta烯烃聚合催化剂进展 总被引:1,自引:0,他引:1
综述了Ziegler-Natta催化剂在乙烯聚合和丙烯聚合方面的研究开发现状,重点介绍了采用新型二醚化合物作为内给电子体的丙烯聚合催化剂的进展。随着合成树脂向功能化方向发展,开发综合性能优越的新型催化剂及给电子体将是今后的研究方向。 相似文献
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Ziegler-Natta催化剂中醚/酯复合给电子体对烯烃聚合的影响 总被引:1,自引:0,他引:1
实验制备了5种含不同内给电子体(乙二醇二甲醚,邻苯二甲酸二丁酯和3种二者不同比例复合内给电子体)的MgCl_2负载型乙烯/1-己烯共聚合Ziegler-Natta催化剂。研究了复合和单一给电子体的催化剂的催化性能。实验结果表明:与单一给电子体的催化剂相比,复合内给电子体催化剂的乙烯聚合活性明显提高,当n(EGDE):(DBP)=1:1时,活性最高,为15 190 g/g,正共单体效应更明显,而复合内给电子体催化剂制备的聚合物相对分子质量减小,相对分子质量分布变窄。 相似文献
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利用以9,9-二(甲氧基甲基)芴为内给电子体的MgCl2载体型Zigler-Natta(Z-N)催化剂与单活性中心茂金属催化剂制备出Z-N/茂金属复合催化剂Z-M,考察了催化剂组分含量对其活性的影响。结果表明,当复合催化剂Z-M中的Ti,醚,Al,Zr质量分数分别为3.10%,12.00~15.00%,12.00%,0.12%时,常压聚合催化活性可达2.70×105g/(mol.h),制备的均聚聚丙烯(PP)等规度可达98.9%,适于作为抗冲共聚PP基体。利用Ti,醚,Al,Zr质量分数分别为2.95%,13.10%,11.80%,0.11%的复合催化剂Z-M在模式装置上所制备的抗冲共聚PP性能优良,在保持与传统Z-N催化剂制备的抗冲共聚PP其他性能相当的基础上,常温悬臂梁冲击强度提高至659 J/m。 相似文献
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给电子体的研究和开发是Ziegler-Natta催化剂发展的关键。综述了密度泛函理论(DFT)计算在Ziegler-Natta催化剂给电子体研究中的应用进展,重点讨论了利用DFT计算可研究给电子体在MgCl2载体表面的吸附作用、不同给电子体的配位模式、给电子体对于Ziegler-Natta催化剂区域选择性和立构定向性的影响。对DFT计算在给电子体研究中的发展方向进行了展望。 相似文献
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将丙二酸酯化合物、邻/对苯二甲酸酯化合物、二醇酯化合物、芳香酸单酯化合物、硝基化合物、氰基化合物、环三藜芦烃(H1)和二苯基蒽类衍生物等给电子体引入Ziegler-Natta(Z-N)聚乙烯催化剂中,研究了上述给电子体对催化剂的聚合活性、氢调敏感性以及聚合粉料堆密度、分子量及其分布的影响。实验结果表明,二酯类化合物可降低催化剂的聚合活性、提高聚合粉料的分子量;芳香酸单酯化合物可提高催化剂的聚合活性和氢调敏感性;硝基和氰基化合物会显著降低催化剂的聚合活性;H1可显著提高催化剂在高氢气乙烯摩尔比(简称氢乙比)条件下的聚合活性和氢调敏感性;二苯基蒽类衍生物可提高催化剂在低氢乙比条件下的聚合活性,但对于催化剂氢调敏感性的影响相对较小。因此,芳香酸单酯化合物和H1类更适于作为Z-N聚乙烯催化剂的给电子体。 相似文献
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采油过程中,酸化是油气井增产、注水井增注的主要措施。砂岩基质酸化和碳酸岩基质酸化都是在低于储层破裂压力的条件下向地层中注入酸液,溶解地层中的可溶物质,清除孔隙或裂缝中的堵塞物质,从而使油气井增产或注水井增注的一种工艺措施。本文着重讨论了砂岩酸化的设计计算方法,并由此建立一套基质酸化设计方法。 相似文献
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《Oil and Energy Trends》2008,33(5):6-7
This section summarizes downstream developments of the previous month. Exploration & Production are covered in 'Upstream Review'.
An upsurge of violence in Iraq threatened a recovery in output that began earlier this year. Production in the northern fields hit a post-invasion high of 620,000 bpd in March, rising by 180,000 bpd in one month. Fighting in the south, however, cut production there by more than 100,000 bpd as government troops tried to subdue Shi'ite militias in and around Basrah. Oil installations damaged in the south included a pipeline and a pumping station. The Iraqi government nevertheless announced that oil production would reach 2.9 mn bpd by the year's end, requiring an increase of nearly 500,000 bpd over April 2008 levels. Foreign help is to be sought via a series of technical service agreements and - later this year - an upstream licensing round. Japan's Ministry of Economy, Trade and Industry says it wants a bigger role for Japanese oil companies in both the upstream and downstream sectors in Iraq. Kurdistan says it is negotiating with Baghdad to export oil produced from new oil fields there. The central government does not recognize production agreements drawn up by the Kurdistan Regional Government. The EU - desperate for gas to fill its Nabucco pipeline - has approached Iraq for up to 1 bn cfd. 相似文献
An upsurge of violence in Iraq threatened a recovery in output that began earlier this year. Production in the northern fields hit a post-invasion high of 620,000 bpd in March, rising by 180,000 bpd in one month. Fighting in the south, however, cut production there by more than 100,000 bpd as government troops tried to subdue Shi'ite militias in and around Basrah. Oil installations damaged in the south included a pipeline and a pumping station. The Iraqi government nevertheless announced that oil production would reach 2.9 mn bpd by the year's end, requiring an increase of nearly 500,000 bpd over April 2008 levels. Foreign help is to be sought via a series of technical service agreements and - later this year - an upstream licensing round. Japan's Ministry of Economy, Trade and Industry says it wants a bigger role for Japanese oil companies in both the upstream and downstream sectors in Iraq. Kurdistan says it is negotiating with Baghdad to export oil produced from new oil fields there. The central government does not recognize production agreements drawn up by the Kurdistan Regional Government. The EU - desperate for gas to fill its Nabucco pipeline - has approached Iraq for up to 1 bn cfd. 相似文献
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