Purification preparation method of bamboo fiber reinforced natural polymer composite material

By using steam explosion treatment to form a three-dimensional cross-linked network of bamboo fiber, tannic acid, and multivalent metal ions, and by using nanocellulose reinforcement, the problem of weak interfacial bonding in bamboo fiber composites was solved, and high-strength, water-resistant, and stable composite materials were prepared.

CN122103626APending Publication Date: 2026-05-29JINNADUO BIOENGINEERING (SHANDONG) CO LTD
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Patent Information

Application Number
CN202610478662.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing bamboo fiber reinforced natural polymer composites have significant technical defects in terms of interface modification, cross-linking process and multi-scale reinforcement, resulting in weak interfacial bonding, easy delamination, unstable mechanical properties, and traditional modified layers are prone to falling off, making it impossible to maintain material properties for a long time.

Method used

Bamboo fiber was treated with steam explosion, and impurities were removed by ethanol and hydrogen peroxide solution. Tannic acid was used to form a polyphenol interface layer, which formed a three-dimensional coordination crosslinking network with multivalent metal ions. A multi-scale synergistic reinforcement phase was added through a staged method of low-temperature interface pre-crosslinking and high-temperature overall crosslinking to form a multi-scale synergistic reinforcement structure.

Benefits of technology

It significantly improves the tensile strength, flexural strength and shear strength of composite materials, enhances interfacial stability and water resistance, improves material property uniformity and stability, and is easy to industrialize using environmentally friendly raw materials.

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Abstract

The invention relates to the technical field of bamboo fiber composite materials, in particular to a purification preparation method of a bamboo fiber reinforced natural polymer composite material. The bamboo raw materials are subjected to smashing and steam explosion treatment, and primary bamboo fibers are obtained; the primary bamboo fibers are sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment, and purified bamboo fibers are obtained; the purified bamboo fibers are placed in a tannic acid solution to be treated, and a polyphenol interface layer is formed on the surfaces of the purified bamboo fibers; a solution containing multivalent metal ions is added into the treated bamboo fibers, and a coordination cross-linking interface layer is formed on the surfaces of the bamboo fibers. According to the invention, a stable interface layer is constructed between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, the tensile strength, bending strength and shearing strength of the composite material are remarkably improved, and the problems that a traditional natural composite material is weak in interface and prone to delaminating are solved.
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