Multi-effect synergistic hydrogel composite film and preparation method thereof

By designing a multi-effect synergistic hydrogel composite film, the problems of easy leakage of phase transition, low thermal conductivity, and separation of electromagnetic shielding and heat dissipation functions in electronic devices are solved, achieving efficient thermal management and electromagnetic protection, and improving the flexibility and stability of the material.

CN121946971APending Publication Date: 2026-05-01HAIAN INST OF HIGH TECH RES NANJING UNIV
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Patent Information

Application Number
CN202610107206.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-27
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing electronic device materials suffer from problems such as easy leakage during phase transition, low thermal conductivity, separation of electromagnetic shielding and heat dissipation functions, and complex manufacturing processes, making it impossible to simultaneously meet the requirements of thermal management and electromagnetic protection.

Method used

A multi-effect synergistic hydrogel composite film was developed, which forms a stable integrated structure through interfacial hydrogen bonding and physical entanglement. The lower layer is a high thermal conductivity electromagnetic shielding layer, which includes polyacrylamide hydrogel, high thermal conductivity filler silicon nitride, and electromagnetic shielding functional filler. The upper layer is a phase change leak-proof layer, which is composed of polyacrylamide hydrogel and phase change material polyethylene glycol. The gradient curing process ensures the synergistic effect of each layer.

Benefits of technology

It achieves multi-functional synergy of phase change cooling, heat conduction, electromagnetic shielding and leakage prevention, improves heat conduction efficiency, enhances electromagnetic shielding performance, and maintains the flexibility and structural stability of the material, making it suitable for multi-power heating scenarios.

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Abstract

The invention discloses a hydrogel-based composite film integrating efficient phase change cooling, high thermal conductivity, electromagnetic shielding and leakage prevention and a preparation method of the hydrogel-based composite film. The thin film is of a double-layer composite structure, wherein the lower layer is a high-thermal-conductivity electromagnetic shielding layer composed of polyacrylamide (PAM) hydrogel, Si3N4 and electromagnetic shielding filler, and the upper layer is a phase-change leakage-proof layer composed of PAM hydrogel and polyethylene glycol (PEG); the upper layer and the lower layer form a stable integrated structure through the synergistic effect of interface hydrogen bonds and physical entanglement, and finally integration of thermal management and electromagnetic protection functions is achieved. The phase change latent heat of the prepared film is larger than or equal to 120 J / g, the X-band electromagnetic shielding effectiveness (SE) is larger than or equal to 32 dB, and leakage is avoided at the high temperature of 80 DEG C. The preparation process is simple, and the product can be applied to various scenes such as power chips, LED equipment and wearable electronic devices.
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