High-toughness bi-component epoxy structural adhesive and preparation method thereof

Abstract

A high-toughness double-component epoxy structural adhesive comprises a component A and a component B which are mutually independent, the component A comprises 30-70 wt% of epoxy resin, 10-20 wt% of an active diluent, 0-15 wt% of an active toughening agent, 10-30 wt% of a filler and 1-5 wt% of an auxiliary agent, and the component B comprises 60-90 wt% of a curing agent, 3-10 wt% of an active toughening agent, 1-5 wt% of a coupling agent, 1-8 wt% of an auxiliary agent and 10-20 wt% of a filler. The component A and the component B are mixed according to the volume ratio of 1: (0.8-1.2) to obtain the high-toughness double-component epoxy structural adhesive. The component A and the component B of the structural adhesive are long in independent storage period, after the component A and the component B are mixed, the curing rate is low, heat release is stable, volume shrinkage is small, formed colloid defects are few, the epoxy structural adhesive obtained through mixing is quite excellent in toughness, T peel strength, impact peel strength and lap joint shear strength for metal bonding, and after curing, a sea island structure is formed, so that the structural adhesive has excellent impact resistance.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a high-toughness two-component epoxy structural adhesive and a preparation method thereof. Background technique [0002] Epoxy structural adhesives are widely used in aerospace, electronic appliances, automotive machinery, civil engineering and other fields due to their excellent bonding performance, cohesive strength, temperature resistance, low creep performance, room temperature curing, and solvent resistance. structural bonding. [0003] However, due to the rigid structure of epoxy resin itself, epoxy structural adhesives show obvious brittleness without toughening. The adhesive joints show defects such as low peel strength, poor impact resistance, and low fatigue resistance. The existence of these defects will significantly restrict the application of epoxy structural adhesives in the above fields. Contents of the invention [0004] The purpose of the present invention is to ad...

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Problems solved by technology

[0003] However, due to the rigidity of the structure of the epoxy resin itself, the epoxy structural adhesive shows obvious brittleness without toughening.

It shows defects such as low peel str...

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