聚丙烯洗涤脱灰工艺研究

摘要脱除聚丙烯树脂中的残留灰分以提升纯度,对于进一步拓展其在电子器件、医疗用品和食品包装等行业的应用具有重要意义。设计"正己烷+异丙醇"复合体系洗涤脱除聚丙烯树脂中的灰分,以降低Ti、Mg和Al等催化剂残留元素含量,从而得到高纯度的聚丙烯。系统研究了洗涤剂种类、洗涤温度、洗涤剂配比、洗涤时间及洗涤剂用量等工艺条件对灰分脱除效果的影响,并探究了洗涤脱灰处理后聚丙烯树脂的性能变化。实验结果表明,利用"正己烷+异丙醇"复合洗涤剂洗涤聚丙烯粉料,总灰分含量降至30.81 μg·g^-1,灰分脱除率达到79.99%,聚丙烯纯度得到显著提升。同时,洗涤脱灰处理提高了聚丙烯的等规度。

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	叶新新
	邢照亮
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关键词：聚丙烯溶剂洗涤灰分

Abstract： Removing the ash and improving the purity of polypropylene resin are important to extend its application in the fields of electronic and electrical membrane parts, medical and health products, food safety appliances. In this research, we designed a system of "n-hexane+isopropanol" to wash and remove the ash in the polypropylene powder to reduce the content of catalyst residual elements such as Ti, Mg, Al, etc., thereby obtaining high-purity polypropylene. The effect of process conditions such as detergent type, washing temperature, detergent ratio, washing time and detergent dosage on the ash removal effect was systematically studied, and the performance change of polypropylene resin after washing and deashing treatment was explored. The experimental results show that the total ash content is reduced to 30.81 μg·g^-1, the ash removal rate reaches 79.99%, and the polypropylene purity is significantly improved by using the "n-hexane+isopropanol" composite detergent to wash the polypropylene powder. At the same time, washing and deashing treatments improve the isotacticity of polypropylene.

Keywords： polypropylene solvent washing ash

Received 2021-08-25;

Fund:国家电网有限公司总部科技项目(5500-201958321A-0-0-00)。

Corresponding Authors: 李健,副教授,E-mail: lijian@tust.edu.cn。 Email: lijian@tust.edu.cn

About author: 叶新新(1997-),女,硕士研究生,现从事聚丙烯洗涤脱灰方面的研究。

引用本文:

叶新新, 邢照亮, 姜涛, 李健.聚丙烯洗涤脱灰工艺研究[J]. 化学工业与工程, 2023,40(4): 122-128

YE Xinxin, XING Zhaoliang, JIANG Tao, LI Jian.Research on polypropylene washing-deashing process[J]. Chemcial Industry and Engineering, 2023,40(4): 122-128

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