High-opening transparent polyethylene film and preparation method thereof

By using compound opening agents and slip agents, the problems of adhesion and insufficient transparency of linear low-density polyethylene films during processing were solved, enabling the preparation of high-opening transparent polyethylene films suitable for the packaging industry.

CN122325872APending Publication Date: 2026-07-03PETROCHINA CO LTD
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Patent Information

Application Number
CN202510002366.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the prior art, linear low-density polyethylene film is prone to sticking together during processing, has poor frictional properties, insufficient transparency, and "fisheye" problems. In particular, the transparency decreases and exudates affect the packaging quality after the addition of an opening agent.

Method used

A compound opening agent consisting of silane-modified silica, hydrated magnesium silicate, and cyclic olefin polymers, combined with a slip agent erucamide and an antioxidant, was used to granulate high-opening transparent polyethylene film using a twin-screw extruder. The proportions of each component and process parameters were controlled to improve the film performance.

Benefits of technology

While reducing the amount of opening agent, it significantly improves the opening properties, smoothness and transparency of the film, reduces the number of "fish eyes", and is suitable for industrial continuous production.

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Abstract

The invention discloses a high-opening transparent polyethylene film which is prepared from the following raw materials in parts by mass: 100 parts of linear low-density polyethylene, 0.025-0.055 part of a compound opening agent, 0.05-0.20 part of a slipping agent and 0.05-0.20 part of an antioxidant, the compound anti-blocking agent is obtained by compounding silane modified silicon dioxide, hydrated magnesium silicate and a cycloolefin polymer, the mass ratio of the silicon dioxide to the hydrated magnesium silicate to the cycloolefin polymer is 1: 1: 2-3: 3: 1, the slipping agent is erucyl amide, and the melt mass flow rate of the cycloolefin polymer at 230 DEG C under 2.16 KG is 3 g / 10 min to 10 g / 10 min. The three anti-blocking agents are compounded for use, so that the use amount is greatly reduced compared with the use amount of silicon dioxide singly used in the prior art.
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