High-temperature-resistant and flame-retardant organic silicon sealant for aircraft firewall

Abstract

The invention discloses a high-temperature-resistant and flame-retardant organic silicon sealant for an aircraft firewall, which is prepared from the following components in parts by mass: 10 parts of a component A and 1 part of a component B; wherein the component A comprises the following components in parts by mass: 40 parts of single phenyl silica gel with phenyl content of 20%, 10 parts of basalt chopped yarns subjected to surface treatment by a water repellent, 20 parts of lanthanum oxide, 10 parts of cerium oxide, 5 parts of glass powder, and 20 parts of white mica powder modified by surface treatment; the component B is prepared from the following components in parts by mass: 5 parts of trisilanol ethyl esterification polyhedral oligomeric silsesquioxane; 4 parts of tetraethoxysilane; and 0.2 part of dibutyltin dilaurate. The organic silicon sealant disclosed by the invention cannot penetrate after being burnt for 30 minutes by flame at 1100 DEG C, the heat insulation performance is excellent, the back temperature of a titanium alloy plate does not exceed 250 DEG C, the back temperature of an aluminum alloy plate does not exceed 200 DEG C, and the tensile strength is greater than 5 MPa after long-time thermal aging.

Description

technical field [0001] The invention belongs to the field of sealants, and relates to a high-temperature-resistant and flame-resistant organosilicon sealant for aircraft firewalls. [0002] technical background [0003] In order to isolate some potential flammable areas and protect places that may be subjected to extreme high temperatures, the design of firewalls is required for engines, auxiliary power equipment, and combustion pilots in aircraft, space capsules, and ships. Fire and flame retardant silicone sealant is an indispensable material in the structure of firewalls. The technical solutions at the present stage are all prepared by adding flame-retardant fillers, such as aluminum hydroxide, platinum compounds, melamine and other inorganic and organic flame retardants, through physical mixing. However, with the advancement of aerospace technology, there are more prominent requirements for the flame retardancy and high temperature resistance of components in design. The...

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Problems solved by technology

However, with the advancement of aerospace technology, there are more prominent requirements for the flame retardancy and high temperature resistance of components in design. The working temperature (<200°C) and flame retardancy of the original sealant are no longer competent (resist The flame burning time cannot exceed 15min), for safety reasons, the development of aerospace vehicles is restricted

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