Preparation and properties of polyhydrazide-based high-strength epoxy adhesives

Abstract

Abstract: A polyhydrazide precursor was pre-synthesized via the reaction of hydrazine hydrate and dimethyl terephthalate at 80 ℃. Subsequently, a novel epoxy adhesive was fabricated using epoxy resin E-51 as the matrix and hydroxyethyl ethylenediamine as the curing agent. The influence of polyhydrazide content on the adhesive performance was systematically investigated, and physical properties of the reinforced adhesive, including bonding strength, hardness (Shore D), wettability, and water absorption, were comprehensively evaluated. The debonding behavior of the adhesive in acidic aqueous solutions (35% acetic acid) under simulated service conditions (80 ℃) was characterized to assess environmental resistance.Experimental results demonstrated that the bonding strength of the polyhydrazide-modified epoxy adhesive initially is increased and then decreased with rising polyhydrazide content, while the hardness exhibit a gradual enhancement followed by stabilization. Optimal comprehensive performance is achieved at 7 wt.% polyhydrazide loading, yielding a hardness of 100 HD, bonding strength of 9.13 MPa, and tensile strength of 82.24 MPa. Notably, the adhesive display prolonged debonding resistance in aggressive environments, with a boiling debonding time of 10.4 h in 35% acetic acid at 80 ℃.

Key words: epoxy adhesive, polyhydrazide, high strength, high hardness

CLC Number:

TQ433

ZHANG Hang, DAI Xiao-yu, LI Yan-zhen, ZHANG Ding-jun, ZENG Jia, HE Zi-rong. Preparation and properties of polyhydrazide-based high-strength epoxy adhesives[J]. Journal of Lanzhou University of Technology, 2025, 51(6): 29-34.

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