PREPARATION OF ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE USING STRUCTURED NANOPARTICAL ZIEGLER-NATTA CATALYSTS

Fang Wang; Bin-bo Jiang; Jing-dai Wang; Yong-rong Yang

doi:10.3724/SP.J.1105.2013.12321

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PREPARATION OF ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE USING STRUCTURED NANOPARTICAL ZIEGLER-NATTA CATALYSTS

Research Article | 更新时间：2021-03-19

- PREPARATION OF ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE USING STRUCTURED NANOPARTICAL ZIEGLER-NATTA CATALYSTS
- Acta Polymerica Sinica Issue 8, Pages: 985-992(2013)
- 作者机构：
  
  化学工程联合国家重点实验室浙江大学化学工程与生物工程学系,杭州,310027
- 作者简介：
- 基金信息：
- DOI：10.3724/SP.J.1105.2013.12321
  CLC：
- Published：20 August 2013，
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Fang Wang, Bin-bo Jiang, Jing-dai Wang, Yong-rong Yang. PREPARATION OF ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE USING STRUCTURED NANOPARTICAL ZIEGLER-NATTA CATALYSTS. [J]. Acta Polymerica Sinica (8):985-992(2013)
DOI：

Fang Wang, Bin-bo Jiang, Jing-dai Wang, Yong-rong Yang. PREPARATION OF ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE USING STRUCTURED NANOPARTICAL ZIEGLER-NATTA CATALYSTS. [J]. Acta Polymerica Sinica (8):985-992(2013) DOI： 10.3724/SP.J.1105.2013.12321.

摘要

用1

4-丁二醇作为络合沉淀剂

通过再结晶活化法将晶型混乱并具有晶格缺陷的纳米级MgCl2晶粒均匀分散在硅胶表面

形成结构化纳米载体.将此载体用于负载TiCl4得到结构化纳米Ziegler-Natta催化剂.研究了醇镁比对载体形貌的影响

以及结构化纳米催化剂用于乙烯聚合的催化特性和产物特点.乙烯淤浆高压聚合结果表明结构化纳米Ziegler-Natta催化剂可用于制备超高分子量聚乙烯

并且温度对催化剂活性和聚乙烯产物的分子量都有很大的影响

在实验条件下催化剂活性可达到1261 kg PE(molTi)-1h-110-5Pa-1

超高分子量聚乙烯的黏均分子量可达到5.87106.SEM、DSC和粒径分析等结果表明

结构化纳米催化剂制备的聚乙烯产物结晶度高

在实验考察条件下最高可达到49.5%

而且产物形貌规整

接近球形

平均粒径在68~69 m之间

利于后续的生产加工.

Abstract

A structured nanoparticle support was prepared by using diol as precipitant to recrystallize nano-sized MgCl2 on the surface of SiO2.TiCl4 was immobilized on the surface of the resulting structured nanoparticle support

forming structured nanoparticle Ziegler-Natta cataylst.The resulting catalyst was used to catalyze the slurry-phase polymerization of ethylene.Polyethylene produced was characterized with scanning electron microscopy (SEM)

differential scanning calorimetry (DSC) and particle size analysis.In order to obtain the proper catalyst

the influence of diol/MgCl2 ratio on support morphology

catalysis features of structured nanoparticle catalyst and characteristics of products were investigated.Results showed that the structured nanoparticle Ziegler-Natta catalyst was an excellent catalyst for producing ultra high molecular weight polyethylene (UHMWPE) because of its special particle morphology.Polymerization activity and molecular weight of products were both sensitive to the temperature.At the optimum temperature

polymerization activity could reach as high as 1261 kg PE(molTi)-1h-110-5Pa-1 and molecular weight of product could reach as high as 5.87106.UHMWPE produced with structured nanoparticle Ziegler-Natta catalyst had a high crystallinity degree which could reach 49.5%.It also performed a uniform spherical morphology with an average particle size of 68~69 m and moreover the distribution of particle size was very narrow.These were all beneficial to the processing of UHMWPE.

关键词

超高分子量聚乙烯结构化纳米催化剂二醇重结晶Ziegler-Natta催化剂

Keywords

Ultra high molecular weight polyethyleneStructured nanoparticle catalystDiol recrystallizationZiegler-Natta catalyst

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Related Institution

Shaanxi Yanchang Zhongmei Yulin Energy & Chemical Company

University of Chinese Acadamy of Sciences

CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University

Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

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