Supercritical fluid injection foaming polylactide foam material and preparation method therefor

US12202179B2 · kind B2 · utility

Assignee

• NINGBO INSTITUTE OF MATERIALS TECHNOLOGY & ENGINEERING, CHINESE ACADEMY OF SCIENCES · CN

Inventors

• Long Wang · Shanghai, CN
• Wenge Zheng · Ningbo City, CN
• Qian Ren · Portland, US
• Lihua Zhang · Dalian, CN
• Minghui Wu · Beijing, CN
• Fei Wu · Beijing, CN
• Haibin Luo · Ningbo City, CN

Key dates

• Filing date: Sep 11, 2020
• Grant date: Jan 21, 2025
• Expiry date: Aug 14, 2041

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H11/20
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The present application relates to a supercritical fluid injection foaming polylactide foam material and a preparation method therefor. The method includes: first obtaining a surface-modified cellulose nanofiber aqueous solution; then melting and blending the cellulose nanofiber aqueous solution and a polylactide twice; passing same through extrusion, cooling under water, and granulation so as to obtain a polylactide/cellulose nanofiber composite material; then plasticizing and melting the polylactide/cellulose nanofiber composite material in a microporous foaming injection molding machine; uniformly mixing same with a supercritical fluid foaming agent in the injection molding machine; injecting same into a mold cavity; and subjecting the resultant to post-treatment so as to obtain a polylactide foam material. The polylactide foam material has a sandwich structure, in which two outer surface layers are solid layers that do not contain any foam, and the sandwiched layer is a foam layer having a cellular structure.