High temperature resistant honeycomb core strip adhesive, preparation method and application thereof

Abstract

The invention provides a high-temperature-resistant honeycomb core strip glue, a preparation method and an application thereof, and belongs to the technical field of honeycomb core material preparation. The core strip adhesive is prepared from components including the following mass ratio: 100 parts of polyimide resin; 5-60 parts of active modifier; 10-35 parts of thermoplastic resin; 1-15 parts of inorganic nanoparticles; 150 parts of solvent ‑350 servings. The preparation method is: add 1 / 4 to 1 / 3 of the thermoplastic resin to the active modifier, dissolve it in the range of 100 to 150°C, then lower the temperature to below 80°C, and add the remaining thermoplastic resin and inorganic nanoparticles to the Among the active modifiers, component A is obtained by stirring and dispersing; under the condition of stirring at room temperature, the polyimide resin and component A are added to the solvent to dissolve and disperse to obtain a uniform and stable honeycomb core strip adhesive. The core strip adhesive of the invention has the characteristics of good manufacturability, low curing temperature, high temperature resistance, excellent mechanical properties, etc., and is suitable for the preparation of ultra-thin glass cloth honeycombs.

Description

technical field [0001] The invention belongs to the technical field of honeycomb preparation, and relates to a high-temperature-resistant honeycomb core strip adhesive, a preparation method and an application thereof. Background technique [0002] Honeycomb sandwich structure composite materials are widely used because of their advantages such as high specific strength, good impact resistance, vibration reduction, wave penetration, and strong designability, especially in the field of aerospace. One of the indispensable structural materials. With the continuous improvement of application requirements, the requirements for light weight and temperature resistance of composite materials are also continuously improved. At present, in the honeycomb sandwich structure, the two types of main materials, the honeycomb core and the panel, still have a relatively large difference in temperature resistance. The development and application of resin-based composite materials with a temper...

AI Technical Summary

Problems solved by technology

Honeycomb substrates with a temperature resistance above 300°C include titanium alloy metal foil, glass cloth and high temperature resistant paper, but the density of titanium alloy metal foil is too high to meet the needs of light weight; high temperature resistant paper (PBO paper or PI paper, etc. , fibers randomly distributed) technology maturity and stability are not good, the cost is expensive, especially the prepared honeycomb core material has poor compressive and shear properties

Commonly used modifiers for toughening and modifying thermosetting resins include rubber elastomers and thermoplastic resins. Although rubber elastomers have good manufacturability, their temperature resistance grades are low; thermoplastic resins have high temperature resistance grades, but they dissolve in the main resin. Increase the viscosity of the core strip glue, especially in order to ensure a good toughening effect, it is necessary to add a sufficient amount of thermoplastic resin, which will lead to a substantial increase in the viscosity of the core strip glue, and serious wire drawing will occur when the core strip glue is coated. Process defects that cause massive sticking of honeycombs

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