Study on the Localization of Ultra-high Purity Polypropylene Resin Preparation Technology

YANG Lei; FU Hongsheng; ZHAO Haipeng; ZHANG Peiling; WANG Yuheng; WANG Lihui; LU Shuaihui; BAI Chunhai

doi:10.14044/j.1674-1757.pcrpc.2026.04.013

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Study on the Localization of Ultra-high Purity Polypropylene Resin Preparation Technology

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Key Technologies for the Full-chain Localization of Polypropylene Film Capactors

Study on the Localization of Ultra-high Purity Polypropylene Resin Preparation Technology
超纯聚丙烯树脂制备技术国产化研究
SINOPEC Zhongyuan Petrochemical Co., Ltd., Henan Puyang 457000, China
SINOPEC(Henan)Refining & Petrochemical Co., Ltd., Henan Luoyang 471012, China
Vol. 47, Issue 4, Pages: 108-115(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.04.013
稿件说明：

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YANG Lei, FU Hongsheng, ZHAO Haipeng, et al. Study on the Localization of Ultra-high Purity Polypropylene Resin Preparation Technology[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 108-115.
DOI：

YANG Lei, FU Hongsheng, ZHAO Haipeng, et al. Study on the Localization of Ultra-high Purity Polypropylene Resin Preparation Technology[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 108-115. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.013.

摘要

电工级超纯聚丙烯树脂是制取干式直流电容器用金属化薄膜和油浸式电容器用粗化膜的基础材料，因其下游制膜加工难度大、稳定性要求高及终端应用场景特殊，对树脂的灰分含量、等规指数、分子量分布、析出物等关键物性指标要求非常苛刻。传统催化剂体系生产的聚丙烯产品的灰分含量一般≥200 ppm，远远达不到超纯聚丙烯要求的≤30 ppm，同时因应用场景不同，等规指数差异性较大，难以实现精准调控。因此，进口产品一般采用“淤浆聚合+洗涤脱灰”工艺路线（简称～“两步法”）进行生产；国内产品基于高活性主催化剂，在ST-Ⅱ双环管聚丙烯工艺装置上无需增加“洗涤脱灰、脱无规物”流程，直接聚合生产（简称～“一步法”）。由于工艺路线不同，在产品结构、低聚物含量、加工工艺窗口及装置运行成本、物耗、能耗等技术、经济指标上存在一定差异。本研究可为聚两烯树脂的制备提供参考。

Abstract

Electrical-grade ultra-high pure polypropylene resin is the base material used for manufacturing metallized films for dry-type DC capacitors and roughened films for oil-impregnated capacitors. Due to difficulty of downstream film-forming processing

high stability requirements and special nature of the end-use applications

the resin is subejct to extremely stringent requirements on key physical property indicators such as ash content

isotactic index

molecular weight distribution and extractables. Polypropylene products produced by conventional catalyst systems generally have an ash content of ≥200 ppm

far exceeding the upper limit of 30 ppm requirement for ultra-pure polypropylene. At the same time

due to the different application scenarios

the isotactic index varies considerably

making precise control difficult to achieve. Therefore

the imported products are generally produced using the“ slurry polymerization+washing and de-ashing“process rute (abbreviated as the“two-step method”). Domestic products

on the other hand

are produced directly by polymerization on ST-Ⅱdouble-loop polypropylene process units

using highly active main catalysts

without the need for additional“washingand de-ashing”or“active removal”steps (abbreviated as the“one-step method”). Due to the different process routes

there are certain differences in technical and economic indicators such as product structure

oligomer content

processing window

as well as unit operating costs

material consumption

and energy consumption.

关键词

Keywords

references

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