气相法制备高乙烯含量的高抗冲聚丙烯

发布时间：2018-10-05 08:02

【摘要】：反应器内合金化技术生产高抗冲聚丙烯(hi PP)过程中,目前工业上普遍采用加入低纯氮(LPN)的方式阻止聚丙烯颗粒表面生成乙丙橡胶的防粘策略,限制了乙烯含量的提高,使得其抗冲性能受到一定的制约。提出了一种在共聚气相釜中原位添加极少量(0.1%)超细粉体的方法,通过局载化于聚丙烯颗粒表面,从而起到替代低纯氮的作用,并能通过物理阻隔的方式进一步防止颗粒间发黏聚并,成功将其运用于Hypol工艺,制得高乙烯含量(20%)且流动性良好的hi PP。同时,将产物与传统低纯氮体系的进行比较,其常温抗冲性能由36.44 k J·m?2升至60.56 k J·m?2,低温抗冲性能由14.78 k J·m?2升至35.12 k J·m?2,体现出其优异的常温和低温抗冲性能。
[Abstract]:In the process of producing high impact polypropylene (hi PP) by in-reactor alloying technology, it is widely used in industry to add low-purity nitrogen (LPN) to prevent the formation of ethylene-propylene rubber on the surface of polypropylene particles, which limits the increase of ethylene content. The impact resistance is restricted to some extent. A method of adding a very small amount of (0.1%) ultrafine powder into the gas kettle of copolymerization was put forward, which was partially loaded on the surface of polypropylene particles, thus acting as a substitute for low purity nitrogen. It can further prevent interparticle agglutination by physical barrier, and successfully apply it to Hypol process to produce hi PP. with high ethylene content (20%) and good fluidity. At the same time, compared with the traditional low-purity nitrogen system, the impact resistance of the product was changed from 36.44kJ mm2 to 36.44kJ? 2 rising to 60.56kJ? 2, low temperature impact resistance from 14.78kJ? M? 2 rising to 35.12kJ? 2, showing its excellent impact resistance at room temperature and low temperature.
【作者单位】：中国石化扬子石油化工有限公司南京研究院;浙江大学化学工程与生物工程学院化学工程联合国家重点实验室;
【基金】：国家高技术研究发展计划项目(2012AA040306)~~
【分类号】：TQ325.14

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