A kind of preparation method of moderate temperature curing cyanate ester foaming structural adhesive

Abstract

The invention provides an intermediate-temperature-cured cyanate ester foamed structural adhesive and a preparation method thereof and relates to a cyanate ester foamed structural adhesive and a preparation method thereof. According to the intermediate-temperature-cured cyanate ester foamed structural adhesive and the preparation method, the technical problem that a current cyanate ester foamed structural adhesive is high in curing temperature is solved. The intermediate-temperature-cured cyanate ester foamed structural adhesive mainly comprises a cyanate ester prepolymer, a flexibilizer prepolymer, a microcapsule-coated organic tin catalyst and an ultraviolet-activated cyanate ester curing agent. The preparation method comprises the following steps: (1) preparing the cyanate ester prepolymer; (2) preparing the flexibilizer prepolymer; (3) preparing the microcapsule-coated organic tin catalyst; (4) preparing the ultraviolet-activated cyanate ester curing agent; (5) weighing the raw materials; (6) carrying out kneading and compression to prepare an adhesive film. The intermediate-temperature-cured cyanate ester foamed structural adhesive can be completely cured at the intermediate temperature, so that the problems that residual stress is produced by the foamed structural adhesive to honeycombs and other adhesion parts in a high temperature curing process, and composite materials are matched in the intermediate temperature curing process are solved.

Description

technical field [0001] The invention relates to a preparation method of cyanate ester foamed structural adhesive. Background technique [0002] In the aerospace industry, honeycomb sandwich (aluminum honeycomb, Nomex honeycomb core, etc.) structures are widely used in satellites, vehicles, aircraft, etc. The adhesive used for this structure, in addition to the honeycomb structural adhesive, is mainly used for sandwich splicing, filling, honeycomb edge (end frame) reinforcement, and various embedded parts (hooks) in the honeycomb sandwich structure. , rings, nuts, etc.) bonding and irregular space filling reinforcement, etc. After the honeycomb sandwich structure is filled, spliced ​​and reinforced with foam glue, the overall mechanical strength of the part and the mechanical strength of the partially installed functional parts can be realized. [0003] At present, the foaming glue of honeycomb sandwich structure is mainly epoxy resin, such as AF3024 of 3M Company, Hysol MA...

AI Technical Summary

Problems solved by technology

[0004] However, in actual use, sometimes due to the heat resistance limitation of supporting materials and the requirements for reducing residual stress and improving component bonding strength and dimensional accuracy, it is necessary to reduce the curing temperature to achieve medium-temperature curing of the foaming agent, but the current curing cyanate foam structure The curing temperature of the glue is higher