Polyethylene powder and process for its preparation, polyethylene resin and process for its preparation and use

By controlling the particle size distribution and sieving process of chromium-based catalysts, polyethylene powder was prepared, solving the problem of balancing the flowability and environmental stress cracking resistance of high-density polyethylene resin, and realizing the preparation of low-cost and stable polyethylene resin.

CN122103415APending Publication Date: 2026-05-29CHINA PETROLEUM & CHEMICAL CORP +2
View PDF 11 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing high-density polyethylene resins struggle to balance processing fluidity and resistance to environmental stress cracking, and their production costs are high and processes are complex.

Method used

By controlling the particle size distribution of the chromium-based catalyst to maintain a high concentration of α-olefin monomers during the polymerization reaction, polyethylene powder of appropriate particle size is screened out and blended with additives to prepare polyethylene resin.

Benefits of technology

This study achieved good environmental stress cracking resistance, processing fluidity, and stability of polyethylene resin, reducing production costs and simplifying the process.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure BDA0005162656440000121
    Figure BDA0005162656440000121
  • Figure BDA0005162656440000131
    Figure BDA0005162656440000131
  • Figure BDA0005162656440000132
    Figure BDA0005162656440000132
Patent Text Reader

Abstract

The application relates to the polyolefin field and discloses a polyethylene powder and a preparation method thereof, a polyethylene resin and a preparation method and application thereof. The preparation method of the polyethylene powder comprises the following steps: (1) in the presence of a chromium catalyst, ethylene and alpha-olefin are subjected to a polymerization reaction to obtain polyethylene particles, wherein the particle size distribution of the chromium catalyst is 20-60 mu m, and the component with a particle size of 40-50 mu m accounts for more than 90 wt%; and (2) the polyethylene particles are subjected to screening to remove components with a particle size of less than 0.125 mm to obtain the polyethylene powder. The polyethylene powder preparation method provided by the application is simple in process and low in cost, the prepared polyethylene powder is used for preparing the polyethylene resin, and the polyethylene resin is good in environmental stress cracking resistance, processing fluidity and stability.
Need to check novelty before this filing date? Find Prior Art