Polyethylene foamed bead composition, process for its preparation and use

By using a metallocene catalyst to prepare polyethylene A and B copolymers, combined with a batch impregnation foaming method, the problems of uneven cell structure and high brittleness of polyethylene foam beads were solved, and foam beads with good flexibility were prepared, thus expanding their application range.

CN119286104BActive Publication Date: 2026-07-07CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2023-07-06
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing polyethylene foam beads suffer from problems such as uneven cell size, high pore breakage rate, high brittleness, and insufficient flexibility, which limit their application range.

Method used

Polyethylene A and polyethylene B copolymers prepared using metallocene catalysts, combined with appropriate antioxidants and other additives, are used to prepare polyethylene foam beads via a batch impregnation foaming method. The branching uniformity and lamellar thickness of the polyethylene molecular chains are controlled, and the melt viscosity is increased to support cell growth.

Benefits of technology

Polyethylene foam beads with uniform size and good roundness were prepared, which have good foaming properties and tensile strength, and are suitable for cushioning components, packaging container inner materials and low temperature packaging.

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Abstract

The present application belongs to the technical field of plastic packaging materials, and particularly relates to a polyethylene foaming bead composition, a preparation method and application thereof. Two polyethylenes A and B produced by using a metallocene catalyst are added with 0.05-0.3 parts of an antioxidant and 0.05-0.5 parts of other additives to prepare polyethylene composition particles. The polyethylene foaming beads are prepared by a kettle immersion foaming method. The obtained foaming beads are uniform in size, good in roundness, and good in foaming performance, and have the characteristics of good flexibility, tensile strength, elongation at break and the like, and can be applied to the fields of cushioning parts, inner packing materials of packaging containers and low-temperature packaging.
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