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A Fluorosilicone Sealant Used for Sealing Aircraft Integral Fuel Tank

An integral fuel tank and sealant technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problem that the high temperature resistant sealant is not retrieved, cannot meet the temperature and fuel resistance performance requirements of the fuel tank, and affects the sealing. Material sealing and other issues, to achieve the effect of good fuel resistance, improved temperature resistance, and improved heat resistance stability

Active Publication Date: 2018-03-09
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the long-term service temperature of the classic polysulfide sealant, modified polysulfide sealant and polythioether sealant used in the overall fuel tank of aircraft is less than 160 °C, while the temperature resistance requirement of the overall fuel tank sealant of high-speed aircraft has exceeded 200 °C. It can even reach 300°C, and put forward higher requirements for fuel resistance and adhesion. The above-mentioned sealants cannot meet the temperature and fuel resistance performance requirements of the fuel tank. At present, it is urgent to develop a sealant for the overall fuel tank of the aircraft with high heat resistance and fuel resistance; In addition, the existing room temperature curing sealant is prone to degradation reaction due to the influence of reaction by-products under airtight conditions, which affects the sealing performance of the sealing material
No published literature was retrieved on high temperature resistant sealants for aircraft integral fuel tank seals

Method used

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  • A Fluorosilicone Sealant Used for Sealing Aircraft Integral Fuel Tank
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  • A Fluorosilicone Sealant Used for Sealing Aircraft Integral Fuel Tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition formula of the high temperature and fuel resistant fluorosilicone sealant is shown in Table 1:

[0020] Table 1 The composition of the high temperature and fuel resistant fluorosilicone sealant

[0021]

[0022] The synthesis steps of platinum and siloxane complexes are as follows: The platinum(0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane and methyl fluorosilicone oil are in accordance with 1: 100 is mixed and stirred for 1 hour to obtain a diluted solution of platinum and siloxane complex.

[0023] The test piece prepared by using this compound has a tensile strength of 3.81MPa, a tensile elongation of 308%, and a 180° peel strength of 3.12kN / m; after the heat-resistant treatment of 250℃*100h, its The appearance has not changed, and the mechanical properties are slightly reduced. Its tensile strength is 3.16MPa and the elongation at break is 281%. Under the same conditions, the polysulfide sample has been severely chalked, and its mechanical properties aft...

Embodiment 2

[0025] The composition formula of the high temperature and fuel resistant fluorosilicone sealant is shown in Table 2:

[0026] Table 2 The composition of the high temperature and fuel resistant fluorosilicone sealant

[0027]

[0028] The mixed coupling agent is the product obtained after mixing γ-glycidoxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane at 60℃~80℃ for 1h~3h, and mixing before reaction The coupling agent is γ-glycidoxypropyltrimethoxysilane and the mass ratio of γ-aminopropyltriethoxysilane is 1:1; the synthesis steps of platinum and siloxane complex are as follows: (0)-1,3-Diethylene-1,1,3,3-tetramethyldisiloxane and methyl fluorosilicone oil are mixed according to 1:100 and stirred for 1 hour to obtain a platinum and siloxane complex Diluent.

[0029] The test piece prepared by using this compound formula has a tensile strength of 3.78MPa, a tensile elongation of 316%, and a 180° peel strength of 3.65kN / m; after the heat-resistant treatment at 250℃*100h, ...

Embodiment 3

[0031] The composition formula of the high temperature and fuel resistant fluorosilicone sealant is shown in Table 3:

[0032] Table 3 The composition of the high temperature and fuel resistant fluorosilicone sealant

[0033]

[0034] The synthesis steps of platinum and siloxane complexes are as follows: The platinum(0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane and methyl fluorosilicone oil are in accordance with 1: 100 is mixed and stirred for 1 hour to obtain a diluted solution of platinum and siloxane complex.

[0035] The test piece prepared by using this compound has a tensile strength of 3.69MPa, a tensile elongation of 321%, and a 180° peel strength of 3.58kN / m; after the heat-resistant treatment of 250℃*100h, its The appearance has not changed, and the mechanical properties are slightly reduced. Its tensile strength is 3.02MPa, and the elongation at break is 299%. Under the same conditions, the polysulfide sample has been severely chalked, and its mechanical properties af...

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Abstract

The invention belongs to the technical field of sealant preparation, and relates to a high-temperature-resistant fluorosilicon sealant used for sealing an aircraft integral fuel tank. It consists of A component and B component, A component is composed of vinyl-terminated liquid fluorosilicone rubber, filler, heat-resistant agent, coupling agent, H-containing fluorosilicone oil and methyl fluorosilicone oil; B component is composed of platinum Composition of complexes and inhibitors with siloxanes. The invention proposes a fluorosilicon sealant used for sealing the integral fuel tank of an aircraft, which improves the temperature resistance level of the sealant of the integral fuel tank, ensures the sealing effect, and meets the sealing requirements of the integral fuel tank of the high-speed aircraft.

Description

Technical field [0001] The invention belongs to the technical field of sealant preparation, and relates to a high-temperature resistant fluorosilicone sealant used for sealing an integral fuel tank of an aircraft. technical background [0002] At present, the long-term use temperature of the classic polysulfide sealant, modified polysulfide sealant, and polythioether sealant for aircraft integral fuel tanks is less than 160℃, while the temperature resistance requirements of high-speed aircraft integral fuel tank sealants have exceeded 200℃. It even reaches 300°C and puts forward higher requirements for fuel resistance and adhesion. The above-mentioned sealants cannot meet the temperature and fuel resistance requirements of the fuel tank. At present, there is an urgent need to develop high heat and fuel resistance aircraft integral fuel tank sealants; In addition, the existing room temperature curing sealants are prone to degradation reactions due to the influence of reaction by-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/08C09J11/04C09J11/06C09K3/10
Inventor 于美超章谏正吴松华秦蓬波
Owner BAIMTEC MATERIAL CO LTD
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