A high-strength room-temperature fast-curing two-component epoxy structural adhesive

Abstract

The invention discloses a high-strength room-temperature-fast-curing bicomponent epoxy-structured adhesive. A component A comprises epoxy resin, a couplant A and fillers, and a component B comprises amodified polyamide curing agent with high imidazoline content, two kinds of different types of modified aliphatic amine curing agents B and C, a toughener, a couplant B and fillers. According to theadhesive, problems in heat resistance, speed increasing and toughening of room-temperature curing of adhesives are solved; the adhesive has better wetting effect and binding power on a substrate, andthe probability of cavity and delaminating is lowered; through adding appropriate fillers, controlling the operating time, mechanical strength and sagging resistance of the adhesive and optimally combining all ingredients of the adhesive, the strength requirements of the adhesive are guaranteed. The adhesive disclosed by the invention can be applied to bonding of composite materials such as metallic materials and non-metallic materials, such as polyurethane foam plates, aluminum honeycomb panels and aluminum plates and production of laminated sandwich plates of military and civilian compartments.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a high-strength room-temperature rapid-curing two-component epoxy structural adhesive for composite sandwich panels. Background technique [0002] In the field of military and civilian boxes, especially in the field of military shelters, the composite sandwich panels used need to have excellent mechanical properties (sandwich panel impact resistance test, sandwich panel roller peeling test) and environmental adaptability (sandwich panel high and low temperature test), and the composite sandwich panel can be industrially produced in large quantities. Therefore, the requirements for room temperature curing structural adhesives used in composite sandwich panels are relatively strict, and the adhesives need to have the characteristics of easy construction, short curing cycle, high strength, and good toughness. [0003] There are two types of room temperature curing str...

AI Technical Summary

Problems solved by technology

[0005] 1. Poor heat resistance: The glass transition temperature Tg of the polyurethane adhesive is low. After a long period of sunlight exposure, the adhesive will have side reactions, and voids are prone to appear at the interface of the adhesive layer of the composite sandwich panel. and bulges, which seriously affect the overall mechanical properties of the composite sandwich panel

[0006] 2. Low structural strength: The shear strength of polyurethane adhesives generally does not exceed 12MPa. For sandwich panels with special core materials, such as honeycomb sandwich panels, when the external load is large, it is easy to cause cohesive failure at the adhesive layer. Leading to failure and delamination of composite sandwich panels

[0010] 3. Insufficient curing: In practical applications, the use of many epoxy adhesives has not reached the ideal curing parameters; at the same time, the curing agent and the resin do not fully react, and the smell is strong

[0011] 4. Sagging problem: For sandwich panels with special core materials, such as honeycomb sandwich panels, when the viscosity of the adhesive is low, when the glue is applied to the upper and lower skins, the glue will flow into the honeycomb gap, resulting in gaps in the joint. Glue, which affects the strength; when the viscosity of the adhesive is too high, it takes a lot of effort to apply the glue, and the binding force to the core material such as foam is poor

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