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Chemically foamed polysulfide sealant for aerospace fuel tank use

一种聚硫化物、密封剂的技术，应用在其他化学过程、化学仪器和方法、胶粘剂等方向，能够解决微结构易塌陷或破裂等问题

Active Publication Date: 2018-01-05
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of physical microstructures has proven problematic because the microstructures can easily collapse or rupture when environmental pressure changes, such as are prevalent during flight (particularly high-altitude flight)

Method used

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  • Chemically foamed polysulfide sealant for aerospace fuel tank use
  • Chemically foamed polysulfide sealant for aerospace fuel tank use
  • Chemically foamed polysulfide sealant for aerospace fuel tank use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A commercially available polysulfide composition, Pro-Seal 890F A-2 (PPG Aerospace), was removed from the refrigerator and thawed in a warm water bath for 10 minutes. The polysulfide ingredients were then dispensed in plastic cups, sodium bicarbonate and acid salt (sodium aluminum sulfate, Table 1) were weighed separately, and mixed with the polysulfide compound in a centrifugal mixer at a predetermined varying RPM. Time (ie, 15 seconds each at 800, 1400, 2000 and 2350 RPM). An aqueous medium comprising deionized water was added to the mixture, and the mixture was remixed in a centrifugal mixer at predetermined varying RPMs for predetermined times (ie, 15 seconds each at 800, 1400, 2000, and 2350 RPM). The sealant mixture was cured for 12 hours at atmospheric pressure in a mixing cup in a 120°F oven.

[0060] Once fully cured, density measurements of the supply polysulfide compound and cured mixture (present as foamed sealant material) were made by cutting slices and m...

Embodiment 2

[0064] A commercially available polysulfide composition, Pro-Seal 890F A-2 (PPG Aerospace), was removed from the refrigerator and thawed in a warm water bath for 10 minutes. The polysulfide ingredients were then dispensed in plastic cups, sodium bicarbonate and acid salt (monocalcium phosphate, Table 2) were weighed separately, and mixed with the polysulfide compound in a centrifugal mixer at predetermined varying RPM Predetermined times (ie, 15 seconds each at 800, 1400, 2000 and 2350 RPM). An aqueous medium comprising deionized water was added to the mixture, and the mixture was remixed in a centrifugal mixer at predetermined varying RPMs for predetermined times (ie, 15 seconds each at 800, 1400, 2000, and 2350 RPM). The sealant mixture was cured in a mixing cup in a 120°F oven for 12 hours.

[0065] Once fully cured, density measurements of the supply polysulfide compound and cured mixture (present as foamed sealant material) were made by cutting slices and measuring the v...

Embodiment 3

[0069] Commercially available polysulfide composition AC-770 (3M - Aerospace Sealants, Garden Grove, CA) was removed from the refrigerator and thawed in a warm water bath for 10 minutes. The polysulfide components were then dispensed in plastic cups, sodium bicarbonate and acid salt (sodium acid pyrophosphate, Table 3) were weighed separately, and mixed with polysulfide compound in a centrifugal mixer at a predetermined changing RPM Mix for a predetermined time (ie, 15 seconds each at 800, 1400, 2000 and 2350 RPM). An aqueous medium comprising deionized water was added to the mixture, and the mixture was remixed in a centrifugal mixer at predetermined varying RPMs for predetermined times (ie, 15 seconds each at 800, 1400, 2000, and 2350 RPM). The sealant mixture was cured in a mixing cup in a 120°F oven for 12 hours.

[0070] table 3

[0071]

[0072]

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Abstract

Improved polysulfide sealant formulations, application of such sealants, and methods for reducing the density of polysulfide sealant formulations are disclosed.

Description

technical field [0001] The present disclosure relates generally to the field of sealants. More specifically, the present disclosure relates to sealants suitable for use in substrates in closed environments, including but not limited to substrates used in the manufacture of fuel tanks for aerospace vehicles. Background technique [0002] Various compounds are used as sealants to achieve a seal at bonded substrate surfaces. Such surfaces requiring sealants may be found on the interior of an aircraft, including, for example, areas within aircraft or spacecraft wings, including, but not limited to, fasteners inside fuel tanks. Such encapsulant materials include various features that are beneficial for their intended end use. With regard to the use of sealants on aircraft and spacecraft, other characteristics also come into play, including, for example, the overall weight that the sealant may add to the aircraft. This extra weight can affect fuel consumption, aircraft performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/08C09K3/10C08L81/04
CPCC09K3/1012C09K2003/1087C09J181/04C08J9/06C08K2003/262C08J2381/04C08J2207/02C08G75/14C08L81/04
Inventor B·E·史蒂文斯B·D·布斯A·M·茨威格
Owner THE BOEING CO
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