A shoe midsole based on degradable pbat foamed beads and a preparation method thereof

By synergistic modification of PBAT/PCL composite foamed beads and specific crosslinking agents, combined with supercritical carbon dioxide foaming and steam molding processes, the problems of non-degradability of traditional petroleum-based shoe materials and the difficulty of PBAT foaming were solved, and a biodegradable shoe material midsole that meets the performance requirements of shoe material midsoles was prepared.

CN122127746APending Publication Date: 2026-06-02SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2026-03-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing petroleum-based footwear materials are non-degradable, and traditional PBAT foaming is difficult and the product performance is poor, making it difficult to meet the requirements of lightweight, high resilience and dimensional stability of footwear midsoles.

Method used

By using PBAT/PCL composite foamed beads, and through the synergistic modification of PCL with a specific crosslinking agent, combined with supercritical carbon dioxide foaming and steam molding processes, a shoe material midsole with uniform pores, low density, and good resilience was prepared.

Benefits of technology

It achieves full biodegradability and excellent mechanical properties in shoe midsoles, meeting the requirements of lightweight, high resilience and dimensional stability, and the manufacturing process leaves no chemical foaming agent residue, which meets the requirements of green manufacturing.

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Abstract

This invention discloses a shoe midsole based on biodegradable PBAT foam beads and its preparation method, belonging to the field of polymer foam material technology. The raw materials for preparing the shoe midsole disclosed in this invention include PBAT / PCL composite foam beads; the mass ratio of PBAT to PCL in the PBAT / PCL composite foam beads is (9:1)–(5:5); the PBAT / PCL composite foam beads also contain a crosslinking agent; the crosslinking agent is 0.5%–3.0% of the total weight of PBAT and PCL. This invention uses PBAT and PCL as the main raw materials, and the product can be completely biodegraded under composting conditions after disposal, fundamentally solving the "white pollution" problem of traditional petroleum-based midsoles.
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