SEALING COMPOSITION Russian patent published in 2006 - IPC C09K3/10 C08L83/04 

FIELD: chemistry of high-molecular compounds.

SUBSTANCE: invention relates to sealing agents. Sealing composition is prepared by stirring fluorosiloxane rubber, mineral filler, a mixture of methylmethoxysiloxane oligomer with tetraethoxysilane as a cross-linking agent and tin octoate as a accelerating agent. As fluorosiloxane rubber the composition comprises low-molecular polyphenylsilsesquioxane block-copolymer consisting of 92-97 mole% of ladder lestosil and 3-8 mole% of methyl-γ-trifluoropropylsiloxanelinks. Components are taken in the following ratio, mas. p. p.: indicated fluorosiloxane rubber, 100; mineral filler, 60-250; cross-linking agent, 2.5-7.0, and tin octoate, 0.5-1.5. The ratio of methylmethoxysiloxane oligomer to tetraethoxysilane = 1:(0.5-1.5). As a mineral filler the composition comprises titanium dioxide, zinc oxide or silicon dioxide. Invention provides enhancing fuel stability, heat stability and retention of working capacity at the known level at temperatures from -60°C to +280°C. Using the proposed sealing agent provides enhancing safety and resource of fuel sections and other aggregates of airplanes of the novel generation. Proposed sealing agent is used in aviation industry for sealing aggregates of airplane constructions: plug disjoints, fuel sections, transducers, hermetic inlets and others exploiting in the broad range of temperatures from -60°C to +280°C.

EFFECT: improved and valuable technical properties of agent.

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