Process for the preparation of graphene-modified conductive thermoplastic polyurethane by wet compounding

By employing microfluidic dispersion orientation, directional-bidirectional cryoforming, and in-situ photothermal reduction processes, the problems of uneven dispersion, agglomeration, and uncontrollable anisotropy of electrical and thermal conductivity in graphene/polymer composites were solved, resulting in the preparation of high-performance flexible conductive composite materials.

CN120904523BActive Publication Date: 2026-06-02WUXI YOUYI NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
WUXI YOUYI NEW MATERIAL TECH CO LTD
Filing Date
2025-08-01
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing graphene/polymer composite materials suffer from problems such as uneven graphene dispersion, severe agglomeration, uncontrollable anisotropy of electrical and thermal conductivity, large amounts of organic solvents, and cumbersome processes, making it difficult to prepare high-performance flexible conductive composite materials.

Method used

A three-dimensional oriented graphene/silver nanowire conductive network was constructed using microfluidic dispersion orientation, directional-bidirectional cryoforming, and in-situ photothermal reduction processes. Combined with a low-boiling-point solvent system, this achieved uniform dispersion of graphene and construction of a conductive and thermally conductive network.

Benefits of technology

The graphene was uniformly dispersed in the TPU matrix, forming a continuous three-dimensional anisotropic conductive and thermally conductive network. This reduced the amount of organic solvent used, simplified the process, and improved the material's electrical and thermal conductivity and flexibility.

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Abstract

The present application relates to the technical field of advanced inorganic non-metallic material preparation, and particularly relates to a wet compounding preparation process of graphene modified conductive thermoplastic polyurethane. The present application provides a solution to the problems in the prior art, such as easy agglomeration of graphene filler, mechanical performance decline caused by increased filler addition, insufficient anisotropic regulation of thermal / electric conductivity, large amount of organic solvent, high recovery cost, and complex process difficult to be continuous; graphene oxide and TPU emulsion are dispersed, oriented and arranged in a low-boiling azeotropic solvent through microfluidic laminar shear; then, a vertical ice crystal template is constructed by using directional-bidirectional freezing technology, and the freeze-dried material is selectively photothermally reduced by using 808nm laser pulses, polydopamine is introduced on the surface of GO, and silver nanowires are filled in the interlayer gap of graphene sheets to realize a multi-scale conductive network. Finally, the performance of the composite material is improved and the process is optimized.
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