A silicone sealant with a temperature resistance of 500°C and its preparation and use method

Abstract

A silicone sealant with a temperature resistance of 500°C of the present invention and its preparation and use method, the sealant includes epoxy silicone resin, hydrolyzed ethyl silicate-40, filler, pigment and diluent agent. During preparation, after the hydrolyzed ethyl silicate 40 is prepared, the epoxy silicone resin is thickened, the pigment is added to form a B1 mixed liquid; the hydrolyzed ethyl silicate 40 is added to form a B2 mixed liquid; the filler is dissolved in the X-7 ring Oxygen paint thinner, form B3 mixed liquid; after mixing B2 and B3 mixed solution, vibrate to form silicone sealant. When using the sealant, wipe and wait for the bonding surface to dry, adjust the viscosity of the sealant, apply it evenly, assemble the parts, and assemble after curing. The sealant prepared by the method of the present invention fully meets the design requirements for the sealability of engine-related parts through assessment tests on material appearance, dryness, heat resistance, sealing performance, corrosion, and sealing effect of typical engine parts.

Description

Technical field: [0001] The invention belongs to the technical field, and in particular relates to a sealant, in particular to a silicone sealant with a temperature resistance of 500°C and a preparation and use method thereof. Background technique: [0002] The sealing glue involved in the present invention is mainly aimed at the special purpose of the engine. It is a necessary material for engine overhaul. It is an imported material: there is no ready-made technical standard, and due to the short storage period, it brings certain difficulties for procurement and cannot guarantee production. Requirements; In an aero-engine, there is always a gap between the joint surfaces of its parts. In order to ensure the normal operation of the engine and maintain the normal operating pressure and safety of the system, the joint surface must be sealed to prevent oil leakage, air leakage, Water leakage, etc., the sealant is mainly used for parts where the sealing gap is very small, such a...

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Problems solved by technology

[0002] The sealing glue involved in the present invention is mainly aimed at the special purpose of the engine. It is a necessary material for engine overhaul. It is an imported material: there is no ready-made technical standard, and due to the short storage period, it brings certain difficulties for procurement and cannot guarantee production. Requirements; In an aero-engine, there is always a gap between the joint surfaces of its parts. In order to ensure the normal operation of the engine and maintain the normal operating pressure and safety of the system, the joint surface must be sealed to prevent oil leakage, air leakage, Water leakage, etc., the sealant is mainly used for parts where the sealing gap is very small, such as the joint surface of the engine combustion chamber casing installation side and the high-pressure turbine guide inner installation side (including the adjustment ring), the joint surface of the high-conductivity inner ring and the swirler (including sealing components), the joint surface of the heat exchanger shell and the heat exchange element, the joint surface of the pneumatic actuator shell and the joint, the oil leakage valve with adjustable nozzle (shell, gasket, valve), the final assembly Transferred thermocouples, nozzles, pressure sensors and other parts; imported sealants are used in the existing technology, and imported materials take time to order, produce, and customs, and will be damaged to varying degrees due to temperature differences and uncontrollable factors. Affect the production schedule and military needs; and the colloid is a fluid, there are hidden dangers in the transportation process

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